Journal articles on the topic 'High-speed printing machinery'
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1
Liao, Yong Hong. "Printed-Electronic PCB Circuit Inkjet Printing Control and Detection System." Advanced Materials Research 457-458 (January 2012): 1163–68. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1163.
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Printed electronic technology is focus in industry as an efficient, low consumption, energy saving, environmentally friendly technology. Ink-jet printing technology is the core of fully printed electronic technology. This article design a Printed electronic Assembly line system consisted of Fixed inkjet array, which can Implement high-speed inkjet printing. It Adopt the print driver architecture In accordance with WDM models which cross kernel and user level. Embedded with electronic circuit design software systems, the electronic circuit design is directly printed to PCB. Interlaced Fixed Multi-inkjet Has parallel high-speed printing features, reduce assembly line machinery vibration, simplify electromechanical servo systems, improve the accuracy of printing. The Design Consist of sections of PCB Positioning, Image servo, Matching printing and Quality detection.
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Xu, Qian Qian, Hai Yan Zhang, He Ping Hou, and Zhuo Fei Xu. "Fault Diagnosis Method of Offset Printer Feeding Mechanism Based on Kernel Principal Component Analysis and K-Means Clustering." Applied Mechanics and Materials 731 (January 2015): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.731.395.
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The printing machine is a sort of large-scale equipment characterized by high speed and precision. A fault diagnosis method based on kernel principal component analysis (KPCA) and K-means clustering is developed to classify the types of feeding fault. The multidimensional and nonlinear data of printed image could be reduced by KPCA to make up the deficiency of the traditional K-means clustering method. In this paper, it is experimentally verified that the classification accuracy of the combined method is higher than the traditional clustering analysis method in feeding fault detection and diagnosis. This method provides a shortcut for the determination of fault sources and realizes multi-faults diagnosis of printing machinery efficiently
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Deng, Wei, Ming Lu, Guo Liang Lu, Zhong Qing Cui, and Xiao Qiang Yang. "The Development of Fault Diagnosis Expert System for High Speed Construction Machinery Based on Portable Data Terminal." Advanced Materials Research 301-303 (July 2011): 1178–82. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1178.
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To overcome the difficulty of field fault diagnosis in the complicated circumstance of construction machinery, the distributed expert system of fault diagnosis is developed in this paper. According to the technical requirements, the hardware platform based on smart industrial portable data terminal is performed. Meanwhile, the modular software of the fault diagnosis expert system is implemented. Its hardware is mainly composed of intelligent portable field testing unit as well as the central control computer. The software platform mainly consists of PDA modules for field fault testing and diagnosis, expert system module, maintenance support and data query module, training module, help module and report printing module. The work has greatly enhanced the capability of field fault detection, diagnosis and maintenance support in military units.
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Evans, D., and C. J. Spicer. "Advances in High-Speed Phosphor Printing." Proceedings of the Institution of Mechanical Engineers, Part B: Management and engineering manufacture 201, no. 2 (May 1987): 85–90. http://dx.doi.org/10.1243/pime_proc_1987_201_050_02.
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The development of the optical character reading (OCR) machine for high-speed code marking and sortation of letter mail has led to the need for a high-speed method of printing the phosphorescent code marks used by the mechanised letter sorting machines. This paper looks at the requirements for the printing system, the method adopted and the results achieved.
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Someya, Hisashi. "Felt Design for High Speed Printing Machines." JAPAN TAPPI JOURNAL 54, no. 5 (2000): 633–40. http://dx.doi.org/10.2524/jtappij.54.633.
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Tang, Wan You, Zhen Rong Wang, and Rui Xue Jiang. "Research of Picture Adaptive Processing for Packaging Printing Online Detection." Applied Mechanics and Materials 469 (November 2013): 368–71. http://dx.doi.org/10.4028/www.scientific.net/amm.469.368.
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In the process of printing machines increasing and reduction of speed, the image collected from online detection system for different speed of printing needs picture adaptive processing. In this paper, there are two methods put forward to realize above goal. One method is sequential similarity detection algorithms and the other is ratio value. Apply with VC++ programming to realize image matching on the premise of the unique CCD detection equipment. The experiment results show that: sequential similarity algorithm on the premise of printing machine running in low speed, by comparing with threshold to realize variable-speed imaging. The ratio value method can be used for a variety of printing speed and it has high speed, high detection efficiency and wide range of application.
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Wang, Yi Ming, Bang She Chen, Yan Li, and Shao Hua Zhang. "Research on Dynamic Design Method Based on Measuring Information for Printing Press." Advanced Materials Research 174 (December 2010): 290–94. http://dx.doi.org/10.4028/www.scientific.net/amr.174.290.
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Printing machinery’s reliability is one of the most important index parameter and good dynamic characteristics are essential for high speed printing press. The dynamic characteristic is predictable for printing machine with dynamic design. With the complexity of printing technique and printing machine, information, such as load on components is lack, leading to the difficulty of dynamic model solving and further more the dynamic parameters needs to be verified. Firstly, according to the dynamic design method, a dynamic design process based on measuring information for printing machine was put forward. Secondly, on the basis of principle and structure analysis to typical printing machine, dynamic characteristics measurement item and method was determined. With a wallboard of a two-color offset press acting as an example, the utilizing method was illustrated through dynamic modeling, theoretical model analysis, experiment model analysis based on vibration measurement and comparing the theoretical and experimental results. Finally, a Dynamic Design Assistant Platform based Vibration Measurement for Printing Machine was developed and had been used in 10 kinds of printing machine measurement and analysis. The conclusion shows that the tolerance of the theoretical model analysis results and experiment results is allowed. A new approach for new printing machine design and optimal design for existed printing machine is given.
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Almy, Raeshifa Diani, and Alva Edy Tontowi. "THE EFFECT OF 3D PRINTING MACHINE PARAMETERS IN EXTRUSION PROCESS OF BIOCOMPOSITE MATERIALS (PMMA AND HA) ON DIMENSIONAL ACCURACY." SINERGI 22, no. 2 (June 27, 2018): 83. http://dx.doi.org/10.22441/sinergi.2018.2.003.
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Bone implants are medical procedures involving replacement or reconstruction of missing or damaged bones with the patient's ones, natural substitutes or artificial substitutes. The widely used bone cement is a polymethylmethacrylate (PMMA) based composite material. To improve bioactivity, PMMA is combined with hydroxyapatite (HA). The manual formation can make bone implants during surgery. However, the method requires a longer operation time and raises the possibility of a higher error. Therefore, 3D printing technology is used to improve the quality of bone implants. One of the machines that can be used is the 3D printing machine, the property of the Product Design and Development Laboratory of Universitas Gadjah Mada. This machine needs to be tested to determine the accuracy of the prints, which is one indicator of product quality. Several machine parameters can be set in this machine setting. This study aims to determine the effect of three parameters, those are perimeter speed or edge print speed (20-40 mm / s), infill speed or inner print speed (50 - 70 mm / s), and fill angle or inner slope of inner printing (45 - 90 ° C). Before printing complex shapes, the machine was tested in advance with a more straightforward specimen design, which is a specimen design of flexural strength test. Response surface experiment design is used to determine the effect of three parameters on the dimensional accuracy which is measured through dimensional error. The results show that these three factors have no significant impact on the dimensional error, but the resulting error is still high. Therefore, it is necessary to adjust the design size before printing.
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Yuan, Ying Cai, Yi Lun Liu, and Yan Li. "Optimization Design of the Web Press’s Fold Mechanism Based on Robustness." Advanced Materials Research 174 (December 2010): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.174.277.
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With the increasing of printing machine’s working speed, the minor changes of design variables will decrease mechanical precision and stability in working state. So, high-speed and high stability are the tow mutual restraint aspects in modern printing machine design. The web press is the highest printing speed and large-scale with, but the stability of fold mechanism is the most significant constraints to speed. In order to increase the mechanism speed and stability, the two robust criterions, kinematics and dynamics precision, has been proposed. Through the kinetic analysis to the fold mechanism of web press, the dynamic model of the mechanism response to design variables has been established. By the model, the optimization model has been established based on robust analysis. Through the robust model, seeking the design variables with the best robustness，the goal of increasing the mechanical long-term stability in high speed can be attached in the condition of ensuring the fold precision. The design example shows that in the case of the stable design variables, the kinematics performances of robust design and trace optimization design are slightly different , but the dynamic performances of robust design are much better than that of trace optimization, and in the case of the design variables’ slight changes, robust design can make the mechanism’s dynamic performances still maintain, but the trace optimization doesn’t. In short, robust design is a good way to increase the stability of machine.
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Ngu, S. S., L. C. Kho, T. P. Tan, and M. Anyi. "A Novel Design of Tube Printing Machine." Applied Mechanics and Materials 315 (April 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amm.315.35.
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This paper reports on the design process necessary for an automatic tube printing machine and the issues concerned with high speed and high productivity tube printing. In the paper a detailed description is put forward for the mechanical system design of the machine. The processes necessary to make the design successful are outlined and the 3D model is carried out using CAD software. The electrical design of the tube printing machine is put forward to illustrate the wiring and electronic/electrical components of the machine.
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Williams, Rhys J., Patrick J. Smith, and Candice Majewski. "Is ink heating a relevant concern in the High Speed Sintering process?" International Journal of Advanced Manufacturing Technology 113, no. 3-4 (February 1, 2021): 1073–80. http://dx.doi.org/10.1007/s00170-020-06508-y.
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AbstractHigh Speed Sintering (HSS) is a novel polymer additive manufacturing process which utilises inkjet printing of an infrared-absorbing pigment onto a heated polymer powder bed to create 2D cross-sections which can be selectively sintered using an infrared lamp. Understanding and improving the accuracy and repeatability of part manufacture by HSS are important, ongoing areas of research. In particular, the role of the ink is poorly understood; the inks typically used in HSS have not been optimised for it, and it is unknown whether they perform in a consistent manner in the process. Notably, the ambient temperature inside a HSS machine increases as a side effect of the sintering process, and the unintentional heating to which the ink is exposed is expected to cause changes in its fluid properties. However, neither the extent of ink heating during the HSS process nor the subsequent changes in its fluid properties have ever been investigated. Such investigation is important, since significant changes in ink properties at different temperatures would be expected to lead to inconsistent printing and subsequently variations in part accuracy and even the degree of sintering during a single build. For the first time, we have quantified the ink temperature rise caused by unintentional, ambient heating during the HSS process, and subsequently measured several of the ink’s fluid properties across the ink temperature range which is expected to be encountered in normal machine operation (25 to 45 ∘C). We observed only small changes in the ink’s density and surface tension due to this heating, but a significant drop (36%) in its viscosity was seen. By inspection of the ink’s Z number throughout printing, it is concluded that these changes would not be expected to change the manner in which droplets are delivered to the powder bed surface. In contrast, the viscosity decrease during printing is such that it is expected that the printed droplet sizes do change in a single build, which may indeed be a cause for concern with regard to the accuracy and repeatability of the inkjet printing used in HSS, and subsequently to the properties of the polymer parts obtained from the process.
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Xu, Zhuo Fei, Hai Yan Zhang, and Ling Hui Ren. "A Fault Diagnosis Method for the Roller-Marks in Offset Printing Machine Based on Texture Recognition." Applied Mechanics and Materials 262 (December 2012): 361–66. http://dx.doi.org/10.4028/www.scientific.net/amm.262.361.
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Roller-mark is a common problem in offset printing and its solution method is important for printing. A new detecting method of texture analysis was given in this paper. In this study, printing image was acquired with high-speed CCD. Compared the difference between printing image and standard image, a defective image was obtained. Then the reason of roller-marks was given by the texture recognition of defect image. Finally, experiments were taken to prove the feasibility and effectiveness of this new method for the roller-marks diagnosis in the offset printing machine.
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Benning, Matthew James, and Kenny Dalgarno. "Proof of concept of a novel combined consolidation and transfer mechanism for electrophotographic 3D printing." Rapid Prototyping Journal 24, no. 6 (August 13, 2018): 1040–48. http://dx.doi.org/10.1108/rpj-04-2018-0111.
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Purpose This paper aims to develop and then evaluate a novel consolidation and powder transfer mechanism for electrophotographic 3D printing, designed to overcome two longstanding limitations of electrophotographic 3D printing: fringing and a build height limitation. Design/methodology/approach Analysis of the electric field generated within electrophotographic printing was used to identify the underlying causes of the fringing and build height limitations. A prototype machine was then designed and manufactured to overcome these limitations, and a number of print runs were carried out as proof of concept studies. Findings The analysis suggested that a machine design which separated the electrostatic powder deposition of the print engine from the layer transfer and consolidation steps is required to overcome fringing and build height limitations. A machine with this build architecture was developed and proof of concept studies showed that the build height and fringing effects were no longer evident. Research limitations/implications Electrophotography (EP) was initially seen as a promising technology for 3D printing, largely because the potential for multi-material printing at high speed. As these limitations can now be overcome, there is still potential for EP to deliver a high-speed 3D printing system which can build parts consisting of multiple materials. Originality/value The analysis of EP, the new method for the transfer and consolidation of layers and the proof of concept study are all original and provide new information on how EP can be adopted for 3D printing.
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Ji, Wen Ge, Hua Wu, Jing Shen, and Mei Feng Wang. "A Novel and Efficient Method for Digital Printing." Applied Mechanics and Materials 404 (September 2013): 668–71. http://dx.doi.org/10.4028/www.scientific.net/amm.404.668.
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We propose a method for digital printing which is novel and efficient. Digital printing is a technical breakthrough in the field of traditional printing and dyeing industry, which is also an effective solution to solve the three high problem, namely, high energy consumption, high noise, high pollution, in the traditional printing and dyeing industry. However, the widely used methods in printing and dyeing system have some deficiencies, such as the low performance of the PC processor and the limitation of transferring data by parallel interface. The proposed method takes advantage of multi-core processor, DMA and RAID technology. Multi-core processor can speed up the processing of the print command and the print images, while DMA technology can minimize the intervention of the CPU to input/output operations which makes the CPU more effective to process the images. Furthermore, the use of RAID technology can improve the access speed of the hard disk which leading to the efficiency improvement of the entire computer system. As we can see that the combination of those three technologies can greatly improve the efficiency of digital printing machine, thus speeding up the popularity of digital printing.
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Kim, Jin-Ho, Jae-Woo Lee, Soo-Hyung Park, Do-Young Byun, Yung-Hwan Byun, and Chang-Jin Lee. "FSI(Fluid-Structure Interaction) Analysis for Harmonious Operation of High-Speed Printing Machine." International Journal of Aeronautical and Space Sciences 9, no. 1 (May 10, 2008): 137–46. http://dx.doi.org/10.5139/ijass.2008.9.1.137.
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Liu, Lin Lin, Fei Lu, and Jing Yi Bai. "Simulation of Inking System Based on Elastohydrodynamic Lubrication." Applied Mechanics and Materials 121-126 (October 2011): 2883–86. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2883.
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the inking system is one of the important components of an offset printing machine and an inking system with good performances is the necessary condition for high quality printing. In this paper, the Reynolds equation for ink transfer was deducted on the basis of the elastohydrodynamic lubrication theory and the relation model between parameters of the roller, speed, pressure and ink thickness in gap of rollers was established by applying the Hertz contact theory, so as to obtain the minimum film thickness equation in gaps of rollers. The influences of roller speed, pressure and size on ink thickness in gaps of rollers were analyzed. In addition, the ink transfer model was modified under the condition of considering retention of ink in gaps of rollers by using Roland700 as the object and the influences of printing speed on inking characteristics were analyzed by applying the method of computer simulation. The results showed that the longer was the inking stabilization time of the system was, the higher the printing speed was.
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Yang, Bo, Bang Gui He, and Yu Chen. "Research on Online Visual Inspection System for Multi-Feature Trademark Defect." Applied Mechanics and Materials 397-400 (September 2013): 2322–25. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.2322.
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Modern printing industry detective techniques, which have transferred from traditional single discrete manual operation into line detection based on machine vision. The line detection research under the highly automated process requirements, which is based on color graphics, gravure text, high-speed stamping and laser hologram hot stamping technology, is the multi-feature defect detection and recognition. By CDD study linear measurement techniques and computer vision technology, the research built the visual inspection platform, and design detection scheme combined with the specific requirements of the printing process in database technology and image processing technology. Research obtained the online testing solutions and system information flow characteristics, which achieved requirement of multi-feature detection, high precision and high speed continuous production technologies.
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Bai, Jian Jun, Yi Ming Wang, and Ying Cai Yuan. "Research on Energy Consumption Test and Data Process Method of Gravure Printing Machine." Applied Mechanics and Materials 738-739 (March 2015): 854–57. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.854.
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In order to achieve high-speed gravure printing machine energy consumption tested and analyzed process efficiently, put forward a kind of electric energy balance test and analysis method, using power analyzer acquire and record the electric energy balance parameters of motors input ports of the three-phase power supply, and processing the data with the method of successive difference. By means of experiment, tested and analyzed the main motor energy consumption of gravure printing machine, the results verify the feasibility of electric energy balance test method and the method of successive difference.
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Dong, Hong Jian, Qin He Zhang, Lei Tan, Guo Wei Liu, and Tuo Dang Guo. "A New Technology to Machine Bimetal Band Saw." Materials Science Forum 861 (July 2016): 9–13. http://dx.doi.org/10.4028/www.scientific.net/msf.861.9.
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As a kind of commonly used tools, junior hacksaw plays an important role in our daily life. A new kind of bimetal band saw taken low carbon medium alloy steel X32 as the backing material and the high-speed steel M42 as the saw tooth material is developed. In this paper, a new method to machine the bimetal band saw with wire electrical discharge machining (WEDM) is introduced. The processing route for common tooth profile is calculated. The fixture with specific angles is designed with CAD software (proe5.0) and machined with 3D printing technology. The experiments show that bimetal band saw machined with WEDM method has better surface quality compared with that machined through the traditional grinding process. Without any burrs, the new bimetal band saw is more resistant to wear and has a longer service life.
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Deng, C. G., Z. Q. Xiang, Fu Zai Lu, and X. Y. Jiang. "Study on the Property and Driver Mode of High-Speed Dot-Matrix Pulse Jet Generator." Key Engineering Materials 392-394 (October 2008): 18–24. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.18.
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Equations of confirming the parameters of device were established through the study of the characteristics of high-speed dot-matrix pulse jet generator which is important unit of the printing machine. Dynamical equations which could be rule for calculating parameters of valve and pipeline were established. Consequently, theory foundation for design and manufacture of high-speed dotmatrix pulse jet generator is provided. The driver mode of jet generator was analyzed and optimized. The design and analyses are proved feasible by experiments.
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Inozemtcev, Aleksandr, and Thanh Qui Duong. "Technical and economic efficiency of materials using 3D-printing in construction on the example of high-strength lightweight fiber-reinforced concrete." E3S Web of Conferences 97 (2019): 02010. http://dx.doi.org/10.1051/e3sconf/20199702010.
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The technology of 3D printing in construction causes great interest by increasing the speed and accuracy of building structures, reducing labor costs, construction waste and risks to human health. Today, the principles of 3D-printing actually are interpretations of the existing monolithic or prefabricated technology. This requires the development of high-performance materials for the extrusion of functional structures. The paper shows the example of the effectiveness application of high-strength lightweight fiber-reinforced concrete with a complex of structural and thermal insulation properties in 3D-printing technology. It has been established that the use of high-strength lightweight fiber-reinforced concrete for 3D-printing provides an increase in the useful space by 1.1...5.4 %, a reduction in the material consumption of wall structures by 6.1...19.1 % and a reduction in the number of machine hours by 29.6...37.4 %. The total technical and economic efficiency of using such a material for a standard or optimized wall section is 30.8...50.4 %.
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Chen, Li, and Wan You Tang. "Research on Image Detection Technology of Printing Based on Dynamic Partitioning Method." Applied Mechanics and Materials 469 (November 2013): 377–82. http://dx.doi.org/10.4028/www.scientific.net/amm.469.377.
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Nowadays, many domestic printing enterprises still rely on artificial visual means to weed out waste, labor-intensive, time-consuming, subjective factors serious influence, the test results not being uniform, especially with the improvement of printing speed, gradually unable to meet the needs of the production. In order to solve the problems in the conventional assay and promote the development of China's printing industry productivity, there is an urgent need to develop the quality of printing online full screen detection system, with the rapid development of modern printing technology, the objective is to test and evaluate. In this paper, machine vision inspection technology, digital image processing technology is used in order to achieve the online testing and feedback of print quality. Dynamic partitioning method is based on standard proofs and proofs of defective segmentation and matching. According to the type of image resolution and the desired accuracy of detecting the type of design image segmentation method, thereby performing the detection and analysis of the color information. Secondary identification defect classification technology is used to change the defect classification, and then display the corresponding defect types. Compared with the traditional printing quality, the high detection print quality inspection speed and precision requirements have been reached, thereby the overall quality of the printed product is improved.
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Roik, T. A., A. P. Gavrish, P. A. Kirichok, and Yu Yu Vitsyuk. "Effect of Secondary Structures on the Functional Properties of High-Speed Sintered Bearings for Printing Machines." Powder Metallurgy and Metal Ceramics 54, no. 1-2 (May 2015): 119–27. http://dx.doi.org/10.1007/s11106-015-9688-5.
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Cheng, Chang Xian. "Dynamic Optimization Design of High-Speed Under-Table Swing-Arm Gripper System in Sheet-Fed Offset Press." Advanced Materials Research 230-232 (May 2011): 916–19. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.916.
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By analyzing various kinds of gripper systems of different sheet-fed offset presses, the under-table swing-arm system, with a fixed axis, has the advantages of meeting high-speed press running requirement, keeping longer dwell time of printing sheets, helping improve print registration, and hence in favor of assuring HIFI print quality while having high press output. The dynamic optimization design of the under-table swing-arm system is vital to the higher performance of the system on the state of the art press machines. Through dynamic analysis of the gripper system, the way of dynamic optimization design and its correspondent formulas are derived in this paper.
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Nguyen, V. H., T. N. Huynh, T. P. Nguyen, and T. T. Tran. "Single and Multi-objective Optimization of Processing Parameters for Fused Deposition Modeling in 3D Printing Technology." International Journal of Automotive and Mechanical Engineering 17, no. 1 (March 30, 2020): 7542–51. http://dx.doi.org/10.15282/ijame.17.1.2020.03.0558.
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This paper presents practice and application of Design of Experiment techniques and Genetic Algorithm in single and multi-objective optimization with low cost, robustness, and high effectiveness through 3D printing case studies. 3D printing brings many benefits for engineering design, product development, and production process. However, it faces many challenges related to parameters control. The wrong parameter setup can result in excessive time, high production cost, waste material, and low-quality printing. This study is conducted to optimize the parameter sets for 3D Fused Deposition Modelling (FDM) products. The parameter sets, i.e., layer height, infill percentage, printing temperature, printing speed with different levels are experimented and analyzed to build mathematic models. The objectives are to describe the relationship between the inputs (parameter values) and the outputs (printing quality in term of weight, printing time and tensile strength of products). Single-objective and multi-objective models according to user’s desire are constructed and studied to identify the optimal set, optimal trade-off set of parameters. Besides, an integrated method of response surface methodology and Genetic algorithm to deal with multi-objective optimization is discussed in the paper. 3D printer, testing machines, and quality tools are used for doing experiments, measurement and collecting data. Minitab and Matlab software aid for analysis and decision-making. Proposed solutions for handling multi-objective optimization through 3D Fused Deposition Modelling product printing case study are practical and can extend for other case studies.
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Shang, Xin Juan, and Hong Rong Lu. "The Application of the Precision Electron Transmission Chain in the Rotary Screen Printing Machine." Applied Mechanics and Materials 574 (July 2014): 577–80. http://dx.doi.org/10.4028/www.scientific.net/amm.574.577.
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This paper introduces a high-precision, closed-loop and automatic checking marks synchronization control system based on STM32.It enhances the multi-axis motion accuracy as the goal synchronization control. The position synchronization arithmetic of cylinders and error compensation arithmetic for guide belt speed is to improve motion control accuracy of the synchronization between cylinders nodes, and realize absolute position synchronization control between cylinders. In the practical application, the system which will improve the grade of textile has simple structure ,low cost, highly accuracy and quickly dynamic response, and it has received satisfactory control effect. it is has the very high value of market popularization.
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Huo, Jiaofei, and Guangpeng Zhang. "High-Temperature Environmental Protection Metal Material 3D Printing Equipment Development and Process Research." Advances in Materials Science and Engineering 2021 (July 24, 2021): 1–9. http://dx.doi.org/10.1155/2021/2701848.
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At present, 3D printing technology is becoming more and more popular, but the traditional learning method has some limitations. The price of 3D printing equipment is expensive, and there are some security risks in the process of learning operation. This paper mainly introduces the development and process research of high-temperature environmental protection metal 3D printing equipment and realizes the design of 3D printing equipment combined with virtual reality technology. In this paper, the whole system of 3D printing equipment is designed and built. The function of motion platform and substrate in mechanical system is analyzed, and the detailed structure design is carried out; the control principle of control system including motion control system and temperature control system is introduced in detail, and the corresponding design and construction work is carried out. In this paper, the pure tin wire with low melting point was used as the experimental material, and the mechanical properties and microstructure of the metal tin forming parts were analyzed. On the basis of tin formation experiment, metal deposition experiment and metal forming error experiment were carried out with H65 high melting copper wire as the raw material. The experimental results show that when the printing speed is 35/mm, the dimensional accuracy of the products is high; the microhardness of the printed tin is close to that of the original material, the surface hardness is 12.50HV0.05, and that of the copper alloy is 14.31HV0.05; the tensile strength of tin wire after melt deposition is slightly reduced after tensile test for the machined tin parts, the ultimate tensile strength of the first group of specimens is reduced by 1.58%, and that of the second group is reduced by 0.74%. This paper combines virtual reality technology with 3D printing technology and develops 3D printing equipment for high-temperature environmental protection metal using virtual reality technology. The forming and printing performance of the device is analyzed theoretically and experimentally. The experimental results verify the feasibility of the system and the practicability of the device.
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CADER, Maciej, and Wojciech KIŃSKI. "Effect of Changing the Parameters of the Multi Jet Fusion (MJF) Process on the Spatial Objects Produced." Problems of Mechatronics Armament Aviation Safety Engineering 11, no. 4 (December 30, 2020): 61–72. http://dx.doi.org/10.5604/01.3001.0014.5644.
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This paper describes the principle of operation of Multi Jet Fusion (MFJ) technology in detail. Hybrid strength tests were carried out using an INSTRON 5967 universal testing machine controlled by the Bluehill 3 program and coupled with the ARAMIS measurement system (GOM, Gmbh), enabling the monitoring of deformations in three axes, using a system of high-speed cameras. The results are given of the static tensile test of samples in two printing modes characteristic of the MJF technology – FAST and BALANCE.
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Kun, Li Hai, Cheng Feng, and Liu Yan Li. "Development of Red Laser Positioning Computer-Aided-Signage System." Advanced Materials Research 179-180 (January 2011): 13–19. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.13.
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This paper introduces the development of red laser positioning computer-aided-signage system. This series of laser cutting machines have red laser auxiliary positioning system, powerful cutting system, the workbench powerful software support, the use of simple, convenient and low cost, complete with diverse demand of cutting, according to relevant literatures, this kind of technology and products to domestic initiative. This product adopts mechanic-electrical comprehensive technology, can achieve the design rules for the high speed and high precision positioning for advertising and cutting, printing industry to design a digital contour cutting provides solutions, changed the traditional manual shear mode, improve the production efficiency.
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Ren, Hao, Jie Sun, and Yue Feng Li. "Research of the PCB Quality Detection for IC Mount Base on the Digital Image Recognition." Applied Mechanics and Materials 740 (March 2015): 684–87. http://dx.doi.org/10.4028/www.scientific.net/amm.740.684.
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A detection method is given in this paper for the automatic surface solder printing quality detection during the automatic welding on PCB. The method of variable metric is used in the processing of the target positioning and the target recognition is used based on the machine vision. The method given here can greatly improve the processing speed in real. The processing of the rotating angle axis positioning theory is mentioned and the verification is done by experiment. This method has the advantage of high accuracy, small detection error and easy to operate.
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Liu, Guo Dong, Lin Lin Liu, and Lei Zhang. "Study on Dynamic Performance of High Spot Open-Closed Gripper Mechanism in Printing Machine." Key Engineering Materials 419-420 (October 2009): 317–20. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.317.
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The paper aims at attacking and noise problems of high spot open-closed gripper mechanism in printing machine in a high speed situation. The analytical method of dynamic performance is presented based on the relative motion, the absolute motion, and the mechanical model. And the analytical equations are established. Then, the dynamic performance of a practical mechanism from XINJI Company is analyzed by the proposed method. The drawbacks of dynamic performance are pointed out that the acceleration and apparent force had jumps in the running process. Finally, on the basis of existed problems, dynamic performance is modified by means of structural design of cam. The analytical results show that the angular acceleration’s peak value of improvement mechanism has been decreased by 62%. Besides, the modified mechanism also expresses an excellent dynamic performance as the flat curve of acceleration, apparent force, contact force and hinge force.
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Cheng, Chang Xian, and Yan Mei Liang. "Study of Evaluation Method about the Presswork Quality of Digital Inkjet System." Applied Mechanics and Materials 540 (April 2014): 512–17. http://dx.doi.org/10.4028/www.scientific.net/amm.540.512.
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At present, the productivity benefits of inkjet printing technology with high speed shows a rapid expanding trends, however, the precondition of which is its high quality presswork. Therefore, one of the top priorities now is to find better way to evaluate the presswork quality scientifically and effectively. A new parameter, ink dot fidelity, was introduced as an evaluation criterion to study the presswork quality in this paper. The four evident effect factors that fluctuated more during the printing process were chosen, such as the paper transmission speed, the print head (nozzle) voltage, the ink cartridge pressure and the distance between the print head and paper, to make the scientific orthogonal experiment design. The fluctuation rules of the ink dot fidelity corresponding to each effecting factors were obtained through intuitively analyzing of the orthogonal tables and the effect curves. Based on the experiment, the test data were fitted and optimized by using the mathematical analysis software of MATLAB and the least-square method. And then the mathematical model for ink dot fidelity and these affecting factors were created. Finally, the user interface (GUI) design platform was developed to improve the man-machine communication and the ink dot fidelity, or the presswork quality.
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Yoo, Hojin, Jongho Jeon, Hansol Kim, Geonho Lee, Seungcheol Shin, Jungho Cho, In Hwan Lee, Geon Hwee Kim, and Myun Joong Hwang. "Fundamental Experiments of Pulsed GMA Additive Manufacturing." Journal of Welding and Joining 40, no. 1 (February 28, 2022): 84–89. http://dx.doi.org/10.5781/jwj.2022.40.1.9.
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Metal 3D printing based on laser sintering is important in various industrial fields. However, its limitations are being revealed due to the need for expensive machines and metal powder. Meanwhile, wire arc additive manufacturing (WAAM) is rapidly arising as an alternative technology thanks to its relatively economic cost. Despite the boom of WAAM, its advantages are not that clear, because the majority of the research to date has been based on relatively expensive facilities, of which the cold metal transfer (CMT) machine is representative. In this study, the WAAM process is being improved with general pulsed GMA to lower the barrier of high cost and facilitate the adoption of the WAAM process in actual manufacturing industries. All process parameters, such as current, voltage, welding speed, and CTWD were examined to figure out a proper synergic line for WAAM. As a result, a high sulfur proportion wire and proper process parameters could be suggested. Finally, the proposed synergic line successfully produced a steel wall consisting of 10 layers with a thickness of 7.2 mm and a height of 22.4 mm, which can serve as an example of WAAM with pulsed GMA.
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Courtemanche, Jean, Samson King, and David Bouck. "Engineering Novel Lab Devices Using 3D Printing and Microcontrollers." SLAS TECHNOLOGY: Translating Life Sciences Innovation 23, no. 5 (March 19, 2018): 448–55. http://dx.doi.org/10.1177/2472630318766858.
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The application of 3D printing and microcontrollers allows users to rapidly engineer novel hardware solutions useful in a laboratory environment. 3D printing is transformative as it enables the rapid fabrication of adapters, housings, jigs, and small structural elements. Microcontrollers allow for the creation of simple, inexpensive machines that receive input from one or more sensors to trigger a mechanical or electrical output. Bringing these technologies together, we have developed custom solutions that improve capabilities and reduce costs, errors, and human intervention. In this article, we describe three devices: JetLid, TipWaster, and Remote Monitoring Device (REMIND). JetLid employs a microcontroller and presence sensor to trigger a high-speed fan that reliably de-lids microtiter plates on a high-throughput screening system. TipWaster uses a presence sensor to activate an active tip waste chute when tips are ejected from a pipetting head. REMIND is a wireless, networked lab monitoring device. In its current implementation, it monitors the liquid level of waste collection vessels or bulk liquid reagent containers. The modularity of this device makes adaptation to other sensors (temperature, humidity, light/darkness, movement, etc.) relatively simple. These three devices illustrate how 3D printing and microcontrollers have enabled the process of rapidly turning ideas into useful devices.
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Aldiansyah, Muhamad Rikza, Kardiman Kardiman, and Deri Teguh Santoso. "Rancang Bangun Mesin Pencetak Pelet Ikan Dengan Memanfaatkan Sekam Padi Sebagai Solusi Pakan Ikan." Jurnal Teknik Mesin 14, no. 1 (June 8, 2021): 16–21. http://dx.doi.org/10.30630/jtm.14.1.458.
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The city of Karawang is famous as a city of rice granaries. As a city of rice granaries, the city of Karawang is assigned a surplus of unhulled rice of 1.5 million tons. This causes a large number of rice husks to become waste from the mills. With the knowledge and skills of farmers who are still minimal in utilizing rice husk waste, most of the rice husk waste by farmers is only thrown away or burned so that it can cause environmental pollution around the disposal of rice husk waste. One way to utilize rice husk waste is to process rice husk waste into animal feed. An alternative to solve this problem is by making a fish pellet printer that is used to produce fish pellets using rice husks as the basic ingredient. This fish pellet printing machine is made with the aim of utilizing rice husk waste which is only thrown away or burned by farmers so that rice husk waste can become a high-value product. In this study, data collection techniques were carried out by studying literature and conducting experiments on fish pellet making machines. After that, the design of the shape was carried out then continued with the manufacture / assembly of components of the fish pellet printing machine and finally the testing of tools / machines with parameters was designed and equipped with an electric motor 250 watts 220 volts 1400 rpm so that it can be used in industry. at home, this electric motor aims to act as a screw driver which is assisted by a WPA gearbox with a ratio of 1:30 so that the rotation obtained is not too fast, the rotation speed can be adjusted by the amount of pulley used so that it can be in accordance with your wishes. With these conditions, it will greatly assist producers in carrying out and speeding up the process of grinding fish pellets.
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Lin, Ching Hui, and Chin Mei Lin. "The Study in the Application of Nanotechnology Digital Printing in Clothing Pattern Design." Key Engineering Materials 562-565 (July 2013): 674–79. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.674.
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Nanotechnology, in the 21st century, is the biggest driving force in the development of technology and industry, which has its wide range of applications. In traditional industries, nanotechnology can be applied to the development of digital printing ink. Digital printing appears as a new printing technology in the 1990s, the 20th century. And in recent years, along with the trends of a global energy saving and carbon reduction, the concept of producing green products with low-carbon, water saving, energy abating, pollution decreasing attributes has arisen. The introduction of digital printing to textiles brings the speed, flexibility, wide areas of color selection, environmental protection and the potential of cost saving etc; the technology becomes a major breakthrough in the textile printing industry. The industry is committed to the technology of environmental friendly digital printing and goes toward to a new pattern of bright future in fashion design. While the globe puts effort to develop digital printing, the core technology should not only focuses on how to come up with high-speed, large amount, low-cost machines, but also the R & D to the making and applications of digital printing, which has a great impact on digital printing quality. At the present, the digital printing ink of the reactive ink / acidic ink is applied to cotton fabrics and the fabrics containing hemp content. The printing process is from the fabric pretreatment → inkjet printing →solid color processing → washing → drying. Moreover, sublimation transfer ink is applied to fabrics containing polyester fiber content; but it cannot be fully colored the fabrics of general 100% cotton and silk, which is the biggest drawback of this sublimation transfer ink. Therefore, this study, primarily through the Nanotechnology with green environmental protection and reduction of carbon from Mimaki Engineering Co., Ltd., captures the moral of the cultural patterns of the local characteristics by the techniques of changing, modeling, designing, and arranging on the patterns of dress design. And it uses computer graphics software, Adobe Photoshop & Illustrator, to draw and trim the separate pattern and the foursquare consecutive pattern for the completion of fashion pattern designs. And it applies the features of the nano pigment ink on the fabrics of cotton, hemp, silk, and polyester fiber to interpret the artistic style of the local through digitized programming language. The importing of nanotechnology refills new sources of industrial competition. This study expects to explore the nanotechnology digital printing and combine with the design of the clothing pattern transforming on the designs, grinding pigment molecules to nano ultra-fine level with reduced light scattering phenomena and good light purity. Fully demonstrating the features of natural bright color, the endurance of pigment water and the light fastness will be able to create a lager space of application and market in the digital printing industry.
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Mao, Huachao, Wenxuan Jia, Yuen-Shan Leung, Jie Jin, and Yong Chen. "Multi-material stereolithography using curing-on-demand printheads." Rapid Prototyping Journal 27, no. 5 (June 2, 2021): 861–71. http://dx.doi.org/10.1108/rpj-05-2020-0104.
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Purpose This paper aims to present a multi-material additive manufacturing (AM) process with a newly developed curing-on-demand method to fabricate a three-dimensional (3D) object with multiple material compositions. Design/methodology/approach Unlike the deposition-on-demand printing method, the proposed curing-on-demand printheads use a digital light processing (DLP) projector to selectively cure a thin layer of liquid photocurable resin and then clean the residual uncured material effectively using a vacuuming and post-curing device. Each printhead can individually fabricate one type of material using digitally controlled mask image patterns. The proposed AM process can accurately deposit multiple materials in each layer by combining multiple curing-on-demand printheads together. Consequently, a three-dimensional object can be fabricated layer-by-layer using the developed curing-on-demand printing method. Findings Effective cleaning of uncured resin is realized with reduced coated resin whose height is in the sub-millimeter level and improved vacuum cleaning performance with the uncleaned resin less than 10 µm thick. Also, fast material swapping is achieved using the compact design of multiple printheads. Originality/value The proposed multi-material stereolithography (SL) process enables 3D printing components using more viscous materials and can achieve desired manufacturing characteristics, including high feature resolution, fast fabrication speed and low machine cost.
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Ayed, Achraf, Guénolé Bras, Henri Bernard, Pierre Michaud, Yannick Balcaen, and Joel Alexis. "Additive Manufacturing of Ti6Al4V with Wire Laser Metal Deposition Process." Materials Science Forum 1016 (January 2021): 24–29. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.24.
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Additive manufacturing (AM) using wire as an input material is currently in full swing, with very strong growth prospects thanks to the possibility of creating large parts, with high deposition rates, but also a low investment cost compared to the powder bed fusion machines. A versatile 3D printing device using a Direct Energy Deposition Wire-Laser (DED-W Laser) with Precitec Coaxprinter station to melt a metallic filler wire is developed to build titanium parts by optimizing the process parameters. The geometrical and metallurgical of produced parts are analyzed. In the literature, several authors agree to define wire feed speed, travel speed, and laser beam power as first-order process parameters governing laser-wire deposition. This study shows the relative importance of these parameters taking separately as well as the importance of their sequencing at the start of the process. Titanium deposit are obtained with powers never explored in bibliography (up to 5 kW), and wire feed speed up to 5 m.min-1 with a complete process repeatability.
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Wang, Zhi Long, Bang Gui He, and Qian Ru Tian. "The Study of Production Process System of New Multi-Feature Continuous Reel Soft Pack Trademarks." Applied Mechanics and Materials 397-400 (September 2013): 29–33. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.29.
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Continuous reel low weight and multi-color soft pack trademarks are used in the high-speed large-volume packaging production process during some new production process. However, most of the existing equipments in the factory are discrete single production machine. Therefore the production process of multi-feature continuous reel soft pack trademarks is needed to be solved urgently. Multi-feature continuous reel soft pack trademark set printing color clarity, color graded accuracy, trademarks pattern and text position accuracy in one. Disposable multi-point high-precision positioning technology, flat local heat transfer technology and digital intermittent control technology are used to achieve continuous reel trademarks high-precision double location synchronization hot stamping. That is, multiple convex word and laser holographic anti-counterfeit pattern intermittent synchronization hot stamping. Machine vision inspection system scan each pixel of trademark with high-speed CCD array and collect it into a computer database for comparison with the standard sample. The defects are recorded by electronic coordinates, building electron stripping system and removing unqualified trademarks, a set of production process system of new continuous reel soft pack trademarks is achieved. This research provides a theoretical basis for technological transformation of enterprises and products the new packaging production, completes its corresponding transformation and crafts integration. It could help enterprise form a new production process system.
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Fung, Vincent WC, and Kam Chuen Yung. "An intelligent approach for improving printed circuit board assembly process performance in smart manufacturing." International Journal of Engineering Business Management 12 (January 1, 2020): 184797902094618. http://dx.doi.org/10.1177/1847979020946189.
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The process of printed circuit board assembly (PCBA) involves several machines, such as a stencil printer, placement machine and reflow oven, to solder and assemble electronic components onto printed circuit boards (PCBs). In the production flow, some failure prevention mechanisms are deployed to ensure the designated quality of PCBA, including solder paste inspection (SPI), automated optical inspection (AOI) and in-circuit testing (ICT). However, such methods to locate the failures are reactive in nature, which may create waste and require additional effort to be spent re-manufacturing and inspecting the PCBs. Worse still, the process performance of the assembly process cannot be guaranteed at a high level. Therefore, there is a need to improve the performance of the PCBA process. To address the aforementioned challenges in the PCBA process, an intelligent assembly process improvement system (IAPIS) is proposed, which integrates the k-means clustering method and multi-response Taguchi method to formulate a pro-active approach to investigate and manage the process performance. The critical process parameters are first identified by means of k-means clustering and the selected parameters are then used to formulate a set of experimental studies by using the multi-response Taguchi method to optimize the performance of the assembly process. To validate the proposed system, a case study of an electronics manufacturer in the solder paste printing process was conducted. The contributions of this study are two-fold: (i) pressure, blade angle and speed are identified as the critical factors in the solder paste printing process; and (ii) a significant improvement in the yield performance of PCBA can be achieved as a component in the smart manufacturing.
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SHU, JUNMING, ARTHAS YANG, PEKKA SALMINEN, and HENRI VAITTINEN. "Development and production experience of the multilayer curtain-coated linerboard of Ji’an PM No. 3,." February 2014 13, no. 2 (March 1, 2014): 17–25. http://dx.doi.org/10.32964/tj13.2.17.
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The Ji’an PM No. 3 is the first linerboard machine in China to use multilayer curtain coating technology. Since successful startup at the end of 2011, further development has been carried out to optimize running conditions, coating formulations, and the base paper to provide a product with satisfactory quality and lower cost to manufacture. The key challenges include designing the base board structure for the desired mechanical strength, designing the surface properties for subsequent coating operations, optimizing the high-speed running of the curtain coater to enhance production efficiency, minimizing the amount of titanium dioxide in the coating color, and balancing the coated board properties to make them suitable for both offset and flexographic printing. The pilot and mill scale results show that curtain coating has a major positive impact on brightness, while smoothness is improved mainly by the blade coating and calendering conditions. Optimization of base board properties and the blade + curtain + blade concept has resulted in the successful use of 100% recycled fiber to produce base board. The optical, mechanical, and printability properties of the final coated board meet market requirements for both offset and flexographic printing. Machine runnability is excellent at the current speed of 1000 m/min, and titanium dioxide has been eliminated in the coating formulations without affecting the coating coverage. A significant improvement in the total cost of coated white liner production has been achieved, compared to the conventional concept of using virgin fiber in the top ply. Future development will focus on combining low cost with further quality improvements to make linerboard suitable for a wider range of end-use applications, including frozen-food packaging and folding boxboard.
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Cunningham, Ross, Cang Zhao, Niranjan Parab, Christopher Kantzos, Joseph Pauza, Kamel Fezzaa, Tao Sun, and Anthony D. Rollett. "Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging." Science 363, no. 6429 (February 21, 2019): 849–52. http://dx.doi.org/10.1126/science.aav4687.
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We used ultrahigh-speed synchrotron x-ray imaging to quantify the phenomenon of vapor depressions (also known as keyholes) during laser melting of metals as practiced in additive manufacturing. Although expected from welding and inferred from postmortem cross sections of fusion zones, the direct visualization of the keyhole morphology and dynamics with high-energy x-rays shows that (i) keyholes are present across the range of power and scanning velocity used in laser powder bed fusion; (ii) there is a well-defined threshold from conduction mode to keyhole based on laser power density; and (iii) the transition follows the sequence of vaporization, depression of the liquid surface, instability, and then deep keyhole formation. These and other aspects provide a physical basis for three-dimensional printing in laser powder bed machines.
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Chai, Cheng Wen, Ji Fei Cai, and Shu Qin Wu. "Research on Pneumatic Controlling Mechanism of Flying Splicer of Web-Fed Offset Presses." Advanced Materials Research 201-203 (February 2011): 2281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2281.
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Flying splicer is a key component of web-fed offset presses for automatically replacing the exhausting web roll with a new one without stopping the machine. The composition and working principle of pneumatic controlling mechanism for driving the flying splicer was analyzed according to the processing requirements of automatic web alternation. By using the software FluidSim, the pneumatic sequential operation controlling circuitry with multi-cylinders for driving the flying splicer was designed, in which the air cylinders cooperates to accelerate the new reel to the circumferential velocity of the expiring web, paste the adhesive end of the new reel with the expiring web, and cut the remaining piece of expired web off. A system scheme and designing method of the pneumatic controlling system suitable for automatic web roll change on high speed offset printing presses was brought out.
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Qin, Qin, Jigang Huang, and Jin Yao. "A real-time adaptive look-ahead speed control algorithm for FDM-based additive manufacturing technology with Hbot kinematic system." Rapid Prototyping Journal 25, no. 6 (July 8, 2019): 1095–107. http://dx.doi.org/10.1108/rpj-11-2018-0291.
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Purpose The purpose of this paper is to enhance the accuracy as well as efficiency of high-speed machining, avoid the speed fluctuation caused by acceleration/deceleration (ACC/DEC) and increase the smoothness of feedrate in continuous corners or curves machining. The Hbot kinematic system was analyzed and combined with fused deposition modeling-based (FDM) additive manufacturing (AM) technology. Then a real-time adaptive look-ahead speed control algorithm was proposed. Design/methodology/approach To validate the performance of Hbot kinematic system and the proposed speed control algorithm, the positioning accuracy of Hbot and cross structure was compared. Also, the experimental verification was conducted among FDM based 3-D printer with cross structure as well as open source speed control algorithm (FDM with cross-OS), cross structure and the proposed speed control algorithm (FDM with cross-PS) and Hbot structure, as well as the proposed speed control algorithm (FDM with Hbot-PS), respectively. Findings The results indicate that the Hbot kinematic system leads to the high stability of positioning accuracy due to the small motion inertia. Furthermore, the experimental verification shows that the efficiency, printing precision and surface finish of models for FDM with Hbot-PS are obviously higher than that for FDM with cross-PS as well as FDM with cross-OS, while FDM with cross-OS shows the worst performance. The contribution of Hbot kinematic system and the proposed speed control algorithm to FDM based AM technology was validated by this work. Practical implications The Hbot kinematic system and proposed speed control algorithm have the important implication of improving the accuracy of FDM machines, especially in the low-price range segment. Also, this work can help future system developers show a possible way of tackling the motion inertia problem. Originality/value The study of Hbot kinematic system and proposed algorithm are expected to advise the current research for improving the accuracy as well as the efficiency of FDM-based AM technology.
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Zeng, X., Z. Cai, and X. Li. "An additive method to fabricate conductive lines and electronic components directly by laser microcladding electronic materials." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 5 (November 9, 2009): 1087–98. http://dx.doi.org/10.1243/09544062jmes1771.
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In this article, a laser direct-write method to fabricate conductive lines and electronic components on insulating boards by using laser microcladding electronic materials is reported. A workstation for implementing this direct-write method was developed, which integrated material deposition (micropen) and laser processing on a single machine. With the computer-aided design/computer-aided manufacturing (CAD/CAM) capability of the workstation, conductive lines, resistors, capacitors, inductors, and thick-film sensors with different patterns were fabricated successfully by this technique in air without mask and with high deposition rates. The minimum widths of the conductive lines and other functional materials were much less than those obtained by the conventional screen printing method. The experimental results demonstrated that passive components and thick-film sensors made by this method have the same properties as those made by conventional thick-film methods, whereas thick films fabricated by this method have much lower widths than those fabricated by the conventional thick-film method. This technique provides a novel method to fabricate the conductive lines and electronic components with high precision and high speed.
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Banadaki, Yaser, Nariman Razaviarab, Hadi Fekrmandi, Guoqiang Li, Patrick Mensah, Shuju Bai, and Safura Sharifi. "Automated Quality and Process Control for Additive Manufacturing using Deep Convolutional Neural Networks." Recent Progress in Materials 4, no. 1 (November 24, 2021): 1. http://dx.doi.org/10.21926/rpm.2201005.
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Additive Manufacturing (AM) is a crucial component of the smart manufacturing industry. In this paper, we propose an automated quality grading system for the fused deposition modeling (FDM) process as one of the major AM processes using a developed real-time deep convolutional neural network (CNN) model. The CNN model is trained offline using the images of the internal and surface defects in the layer-by-layer deposition of materials and tested online by studying the performance of detecting and grading the failure in AM process at different extruder speeds and temperatures. The model demonstrates an accuracy of 94% and specificity of 96%, as well as above 75% in measures of the F-score, the sensitivity, and the precision for classifying the quality of the AM process in five grades in real-time. The high-performance of the model could not be achieved with the values usually used for printing temperature and printing speed, only in addition with much higher values. The proposed online model adds an automated, consistent, and non-contact quality control signal to the AM process. The quality monitoring signal can also be used by the AM machine to stop the AM process and eliminate the sophisticated inspection of the printed parts for internal defects. The proposed quality control model ensures reliable parts with fewer quality hiccups while improving performance in time and material consumption.
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Torabi, Payman, Matthew Petros, and Behrokh Khoshnevis. "Enhancing the resolution of selective inhibition sintering (sis) for metallic part fabrication." Rapid Prototyping Journal 21, no. 2 (March 16, 2015): 186–92. http://dx.doi.org/10.1108/rpj-12-2014-0181.
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Purpose – The purpose of this paper is to study the implementation of a commercial piezoelectric printhead in the fabrication of high-resolution metal parts selective inhibition sintering (SIS-metal). SIS is a disruptive platform additive manufacturing (AM) process capable of printing parts from polymer, metal and ceramic base materials. Design/methodology/approach – The developed system in this paper replaces the single-nozzle solenoid valve previously used in the SIS-metal process and allows for the fabrication of high-resolution parts. A design of experiments approach is utilized to study the effects of important factors in inhibitor deposition. These factors include: composition of the inhibitor, quality of the print and the amount of fluid deposited for each layer. Based on the results of these experiments, parameters have been identified for the creation of 3D parts. Findings – The results of this study were based on the fine tuning of parameters in the updated SIS-metal machine which culminated in the fabrication of complex metallic parts. This study serves as an entry point to important areas of research in need of careful future consideration. These areas include but are not limited to machine robustness, mechanical properties, shrinkage and surface quality. Originality/value – SIS-metal is a novel AM process developed by the CRAFT Laboratories team at the University of Southern California with potential to compete existing metal AM processes in terms of quality, price, materials and speed. The machine developed in this study signifies an order of magnitude improvement in the resolution and quality of SIS-metal parts which are comparable to those fabricated by other AM processes.
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Wang, Baolong, Yi Na, Jian Liu, and Zaiman Wang. "Design and Evaluation of Vacuum Central Drum Seed Metering Device." Applied Sciences 12, no. 4 (February 18, 2022): 2159. http://dx.doi.org/10.3390/app12042159.
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For the purpose of reducing the number of conventional seed-metering devices and high demand for vacuums, this study designed a vacuum central drum seed-metering device, that is intended to replace multiple seed-metering devices with one, which is comprised of the inner and outer drum. This can be replaced with different diameters of suction holes, ventilation housing, seeding tube, agitating devices, seed box, and seed-cleaning devices, etc. A hybrid rice seed Jingliangyou 1212 was applied as an experimental material, and a JPS-12 computer vision metering device test bench was used to test singular-factor and multi-factor seeding performance of the seed-metering device. The singular-factor performance test of the metering device was conducted under negative pressure of seed suction in the range of 1∼1.5 kPa, at the metering device rotation speed of 10∼60 rpm, with diameters of inlet holes being 2 mm (chamfer: 45°), 2, and 1.5 mm, respectively. The number of seeds was counted by a sucking hole under different factor combinations. The multi-factor test was carried out by rotation rate, negative pressure, and types of sucking holes. A rate of 2 ± 1 rice seed per sucking hole is regarded as the qualified standard. It shows that the qualification rate (2 ± 1 rice seed per sucking hole) of seed suction can reach 97.4% under a combination of metering device rotation speed of 30 r/min, negative pressure of 1.0 kPa, and suction hole diameters of 1.5 mm. High-speed photography was used to study the trajectory of seed-metering at different rotation rates, a locomotive axis was applied to fit the motion curve, and 3D-printing was used to make the seed-metering tube so that the seed collisions could be reduced. This study provides evidence for further optimizing the performance of the vacuum central drum direct-seeding machine for hybrid rice.
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Kamaruddin, Abang Mohammad Nizam Abang, Abdullah Yassin, Shahrol Mohamaddan, Syaiful Anwar Rajaie, Muhammad Isyraf Mazlan, Steven Joel Total, and Ridhwan Shah Busrah. "Performance of Low Cost 3D Printed Minimum Quantity Lubrication Applicator Using Palm Oil in Milling Steel." Materials Science Forum 997 (June 2020): 85–92. http://dx.doi.org/10.4028/www.scientific.net/msf.997.85.
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One of the most significant factors in machining process or metal cutting is the cutting tool performance. The rapid wear rate of cutting tools and cutting forces expend due to high cutting temperature is a critical problem to be solved in high-speed machining process, milling. Near-dry machining such as minimum quantity lubrication (MQL) is regarded as one of the solutions to solve this problem. However, the function of MQL in milling process is still uncertain so far which prevents MQL from widely being utilized in this specific machining process. In this paper, the mechanism of cutting tool performance such as tool wear and cutting forces in MQL assisted milling is investigated more comprehensively and the results are compared in three different cutting conditions which is dry cutting, wet cutting (flooding) and MQL. The MQL applicator is constructed from a household grade low-cost 3D printing technique. The chips surface of chips formation in each cutting condition is also observed using Scanning Electron Microscopy (SEM) machine. It is found out that wet cutting (flooding) is the best cutting performance compare to MQL and dry cutting. However, it can also be said that wet cutting and MQL produced almost the same value of tool wear and cutting forces as there is negligible differences in average tool wear and cutting forces between them based on the experiment conducted.
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Ji, Qing, Zhijun Wang, Jianya Yi, and Xuezhi Tang. "Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material." Polymers 13, no. 20 (October 19, 2021): 3605. http://dx.doi.org/10.3390/polym13203605.
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Three-dimensional printing is becoming increasingly popular because of its extensive applicability. However, printing materials remain limited. To determine the mechanical properties of polylactic acid (PLA) and copper powder-filled polylactic acid (PLA-Cu) materials subjected to static and dynamic loading, stress–strain curves were obtained under the conditions of different strain rates using a universal material testing machine and a separated Hopkinson pressure bar experimental device. Scanning electron microscopy (SEM) was used to analyze the micro-morphology of the quasi-static compression fracture and dynamic impact sections. The results revealed that the yield stress and elastic modulus of the two materials increased with increasing strain rate. When the strain rate reached a critical point of 0.033 s−1, the rate of crack propagation in the PLA samples increased, resulting in the material undergoing a change from ductile to brittle. The strength of the material subjected to dynamic loading was significantly higher than that subjected to quasi-static loading. The SEM image of the PLA-Cu material revealed that copper powder was evenly distributed throughout the 3D-printed sample and that stress initially began to concentrate at the defect site corresponding to the interface between the copper powder and PLA matrix; this resulted in comparatively lower toughness. This finding was consistent with the photographs captured via high-speed photography, which confirmed that the destruction of the specimen was accompanied by an explosive crushing process. Additionally, a Zhu–Wang–Tang constitutive model was used to fit the experimental results and establish a viscoelastic constitutive model of the material. By comparing the dynamic stress–strain curve to the theoretically predicted curve, we found that the established constitutive model could predict the mechanical properties of the PLA-Cu material with reasonable accuracy when the strain was below 7%.