Articoli di riviste: "Milling machinery"

1

Nedelcu, Dragoş Iulian, e Ionel Olaru. "Study of Cooling Parameters Using Fluid Jet in Milling Process Simulation". Applied Mechanics and Materials 371 (agosto 2013): 524–28. http://dx.doi.org/10.4028/www.scientific.net/amm.371.524.

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Milling machines are important in machinery industry that requires an appropriate cooling is mandatory in the milling process. This paper is focused on the development of cooling system in order to simulate the action of cooling fluid on a plane plate processing. Furthermore, that study is important in milling process for the improvement of surface characteristic values regarding operability of the internal cooling supply and the implementation in milling process.

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Hu, Hao, Xiao Feng, Shi Qiu, Dan Yang, Zhong Kai Chen e Xiang Li Wang. "Dynamic Optimization Design of Sand Milling Collection Machinery Suspensions". Applied Mechanics and Materials 536-537 (aprile 2014): 1314–20. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1314.

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Sand milling collection machinery is a kind of large machinery to collect the surface soil containing ores. The suspension system of milling machines directly affects the ride comfort and driving safety for the operator; for this end, the design of suspension system has been optimized so as to satisfy the requirements of reliability and comfort by making the console and operator set at the maximum station and minimum absolute acceleration and the amplitude within the range. This paper first established a suspension system model of milling collection machines and set up the state equation of suspension system by applying Lagrange equation. On this basis, this paper conducted the optimized calculation encouraged bt the pavement with sine rule change and obtained an optimal suspension system parameters ki and ci.

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Xu, Kai, e Hiroyuki Sasahara. "Generation of Regularly Aligned Curved Surface Patches on Free-Form Surface for Patch Division Milling". Key Engineering Materials 523-524 (novembre 2012): 54–57. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.54.

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This study describes a new machining strategy to make regularly aligned cutter marks on free-form surface efficiently for increasing the added value of industrial product. While the free-form surface is divided into many small patch segments employing curved surface patch division milling technique which can substitute for the conventional method, thus avoiding the influence of the change in the curvature. And the patch segments will be machined by a spiral tool path respectively, so that regularly aligned cutter marks can be successfully formed on the curved surface patches by controlling cross-feed, feed speed per tooth, number of teeth and the length of the tool path. Comparing the machined surface and the simulation result, the cutter marks agree with it. If the surface is machined only by the ball end milling with a machining center, this method will be a very effective tool for the machinery industry.

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Cai, An Jiang, Yan Jun Guo, Shi Hong Guo e Ming Wei Ding. "The Construction of the Management System of CNC Milling Parameters". Applied Mechanics and Materials 220-223 (novembre 2012): 385–88. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.385.

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CNC Milling Process for the complex characteristics, in order to solve how to quickly and effectively to provide a reasonable and optimal machining parameters of CNC milling process for technologist. The paper takes horizontal machining center DMC60H as a test platform and technological data of shell aluminum alloy hydraulic aircraft engine parts as a study. the paper establish management system of CNC milling parameters which was suitable for machinery manufacturing enterprises. The results showed that: The established parameters of CNC milling system can be better management of various CNC milling technology to effectively manage information and improve the CNC milling process information efficiency, has certain promotion effect to the production of the numerical control milling processing and the development of the manufacturing enterprises.

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Rowe, James, Christopher Langrand e Roger Debuchy. "Case study of vibration in a mobile milling machine". Vibroengineering PROCEDIA 49 (18 maggio 2023): 30–37. http://dx.doi.org/10.21595/vp.2023.23362.

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Many industries rely on heavy-duty machinery such as cranes, pipelines, motors, which are subject to wear and tear. Milling of such parts using conventional machine tools presents many drawbacks and is impossible in some cases. In such situations, mobile machine tools can be used to machine directly on site. However, mobile machines are flexible, and are prone to detrimental vibrations during cutting operations. Vibrational stability in the surfacing process has been extensively studied in conventional milling. However, the focus of this article is an original study on a mobile milling machine used for on-site surfacing operations. An experimental investigation into the vibrational behavior of the machine is carried out and a sensorless method is used to detect the onset of chatter. Machine flexibility is discussed using a tool-point frequency response function and references from the literature. Milling operations are carried out over a range machining parameter to determine an experimental stability limit. Internal sensors for spindle motor consumption and spindle motor encoder are monitored during the machining process. A threshold is established for determining the appearance of chatter using only the machine’s internal sensors.

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Zhu, Cheng Jun, Qi Shu Qin e Peng Er Bao. "The Study of the Multi-Body System Theory on Basis of CNC Milling Machine Error". Advanced Materials Research 383-390 (novembre 2011): 1304–9. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1304.

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CNC machine, especially CNC milling machine, is the main production equipment in the industries of machinery, iron and steel, automobile manufacturing and so on. However, the errors are the main constraints to the processing quality and the precision measurement of CNC machine. Based on the multi-body system theory, the article models the error of Siemens CNC milling machine. In terms of the analysis of the error model, it is argued that the processing precision of CNC milling machine can be improved through controlling and compensating the error in the process of installation and manufacturing.

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Zhu, Cheng Jun, Qi Shu Qin e Peng Er Bao. "The Study of the Multi-Body System Theory on Basis of CNC Milling Machine Error". Advanced Materials Research 433-440 (gennaio 2012): 444–49. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.444.

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CNC machine, especially CNC milling machine, is the main production equipment in the industries of machinery, iron and steel, automobile manufacturing and so on. However, the errors are the main constraints to the processing quality and the precision measurement of CNC machine. Based on the multi-body system theory, the article models the error of Siemens CNC milling machine. In terms of the analysis of the error model, it is argued that the processing precision of CNC milling machine can be improved through controlling and compensating the error in the process of installation and manufacturing.

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Knápek, Tomáš, Štěpánka Dvořáčková e Martin Váňa. "The Effect of Clearance Angle on Tool Life, Cutting Forces, Surface Roughness, and Delamination during Carbon-Fiber-Reinforced Plastic Milling". Materials 16, n. 14 (14 luglio 2023): 5002. http://dx.doi.org/10.3390/ma16145002.

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This study aimed to investigate the effect of the clearance angle of the milling tool on wear, cutting forces, machined edge roughness, and delamination during non-contiguous milling of carbon-fiber-reinforced plastic (CFRP) composite panels with a twill weave and 90° fiber orientation. To achieve the objective of the study, it was first necessary to design suitable tools (6 mm diameter sintered carbide shank milling cutters) with a variety of clearance angles (8.4°, 12.4°, and 16.4°) and all the machinery and measuring equipment for the research to be carried out. Furthermore, measurement and evaluation methods for cutting tool wear, cutting forces, machined edge roughness, and delamination were developed. Last but not least, the results obtained during the research were summarized and evaluated. From the experiments conducted in this study, it was found that the tool clearance angle has a significant effect on tool wear, roughness of the machined surface, and delamination of the carbon fiber composite board. The tool with a clearance angle of 8.4° wore faster than the tool with a clearance angle of 16.4°. The same trend was observed for cutting force, machined surface roughness, and delamination. In this context, it was also shown that the cutting force increased as the tool wear increased, which in turn increased surface roughness and delamination. These results are of practical significance, not only in terms of the quality of the machined surface but also in terms of time, cost, and energy savings when machining CFRP composite materials.

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Gao, Jian She, Wei Wei Yang, De Ping Liu, Yu Ping Wang e An Qing Zhang. "Analysis of Precision Reliability for CX Series of Five-Axis Turning-Milling Center". Advanced Materials Research 383-390 (novembre 2011): 4775–82. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.4775.

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Five-axis turning-milling center is an important and advanced NC machine in fields of military industry, aerospace, automobile and medical machinery. The kinematics equation is built based on D-H method by the analysis of the structure of five-axis turning-milling center. The precision workspace is presented and its definition is given. The precision workspace of five-axis turning-milling center is analyzed based on Monte Carlo method. The mathematical model of precision reliability for machining center is built. The sensitivity of precision reliability for machining center is analyzed using analytical method. Finally, sensitivity histograms are given.

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Mgherony, Abdul W., Balázs Mikó e Ágota Drégelyi-Kiss. "DESIGN OF EXPERIMENT IN INVESTIGATION REGARDING MILLING MACHINERY". Cutting & Tools in Technological System, n. 92 (1 luglio 2020): 68–84. http://dx.doi.org/10.20998/2078-7405.2020.92.09.

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Sliednikova, Olena, Volodymyr Vynnyk, Vasyl Sklyar e Olga Aksonova. "MODULAR THREE-DIMENSIONAL MODELING OF THE PROCESS OF REMOVAL OF ADAPTATION AND FORMATION FORMING THE CAMS WITH AN ORIENTED TOOL". Technical Sciences and Technologies, n. 2(16) (2019): 34–43. http://dx.doi.org/10.25140/2411-5363-2019-2(16)-34-43.

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Urgency of the research. Providing high precision cam camshafts and textile machinery while ensuring high processing performance of these parts is an urgent task in the engineering, automotive and textile industries. Target setting. The high accuracy and quality of machined curved surfaces of the cams will ensure the correct operation of the nodes and will increase their service life. Actual scientific researches and issues analysis. Known methods of processing the curved surfaces of the cams of the camshafts, but in these methods, the flow along the contour is uneven, the depth of cut is different, which reduces the accuracy of the machined part and the processing performance. Uninvestigated parts of general matters defining. The study of the process of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines oriented mill for one installation, which will provide high rates of accuracy and productivity of processing. The research objective. The development of a new method of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines with crossed cutter axes and parts in one fastening will provide an increase in the accuracy and quality of the processed surfaces and processing performance. The statement of basic materials. The presented method of milling the curvilinear surfaces of the cams of the camshafts, where the roughing and finishing work is carried out by a cutter whose height is less than the length of the cam. Milling of all cams of a camshaft is carried out in one fixing with a tool with crossed axes and parts. When machining the cam-shaped cam surfaces, stabilization of the contour feed and removal of the seam allowance is ensured. That provides increased accuracy and processing performance. Conclusions. The proposed method of milling the curved surfaces of the cams of the camshafts and textile machines with crossed axes of the cutter and parts. The proposed method of milling curvilinear surfaces on CNC machines, where in one pass, roughing and finishing milling of all cams takes place.

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Abdul Muchlis. "PROCESS PRODUCTION OF FLUTED ROLL ON ROLL MILLS MACHINERY". International Journal Science and Technology 1, n. 1 (31 marzo 2021): 1–11. http://dx.doi.org/10.56127/ijst.v1i1.1.

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Wheat as raw material for flour, is milled using a Fluted Roll in a Roll Mill machine. Fluted Rolls are made through a machining process that aims to obtain the desired shape, size, and level of surface roughness. This study aims to determine the material contained in Fluted Rolls and the process of making Fluted Rolls through machining processes, such as milling and scraping, as well as welding processes. The results of this study conclude the fluted roll machining process using steel medium carbon, namely JIS S45C and high alloy steel (High Alloy Steel) namely AISI 410, the milling process uses a vertical milling machine, and the scrap machining process uses a CNC (Computer Numerical Control) scrap machine in making flutes on the fluted roll surface. In the milling process using a blade diameter of 20 mm and a main spindle speed of 600 rpm, the machine's cutting speed is 37.68 mm/minute. Welding process on fluted roll aims to connect the milled shaft with the roller mill using TIG (Tungsten Inert Gas). In the scrap machining process, the feeding speed used is 9000 mm/minute and the chisel return speed to point 0 is 27132 mm/minute, resulting in a one-time feeding time of 14.24 seconds. The total time for working on fluted rolls with B3f specifications is the total flute 550, diameter 250 mm, length 1250 mm, and the slope of the flutes that form a spiral is 10% for 2 hours 10 minutes 53 seconds.

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Hielscher, Kathrin. "Ultrasonic Milling and Dispersing Technology for Nano-Particles". MRS Proceedings 1479 (2012): 21–26. http://dx.doi.org/10.1557/opl.2012.1592.

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ABSTRACTUltrasonically generated forces are well known for dispersing and deagglomeration of small volumes in laboratory and bench-top scale. By the evaluation and optimization of the most important ultrasonic parameters and the development of large scale ultrasonic machinery, ultrasound forces can be applied also for particle size reduction and wet-milling of nano-particles in industrial scale.

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Li, Xueguang, Yahui Wang, Liqin Miao e Wang Zhang. "Deformation Analysis of Continuous Milling of Inconel718 Nickel-Based Superalloy". Micromachines 13, n. 5 (27 aprile 2022): 683. http://dx.doi.org/10.3390/mi13050683.

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As a difficult-to-process material, Inconel718 nickel-based superalloy is more and more widely used in aerospace, ocean navigation, and large-scale machinery manufacturing. Based on ABAQUS simulation software, this paper takes the milling force and temperature in the milling process of the nickel-based superalloy as the research object, and establishes the empirical formula for the prediction model of cutting force and cutting temperature based on the method of multiple linear regression. The significance of the prediction model was verified by the residual analysis method. Through data analysis, it is obtained: within a certain experimental range, the influence degrees of each milling parameter on the cutting force and cutting temperature are fz>ap>n and fz>ap≈n, respectively. The actual orthogonal cutting test was carried out on the machine tool, and the reliability and accuracy of the prediction model of cutting force, cutting temperature and tool wear amount were verified. The model formulas of the shear velocity field, shear strain field and shear strain rate field of the main shear deformation zone are constructed by using mathematical analysis methods. The influence law of cutting speed and tool rake angle on the variables of main shear zone is calculated and analyzed. Through the combination of theory and experiment, the relationship between cutting force, chip shape and machined surface quality in milling process was analyzed. Finally, with the increase in the cutting force, the serration of the chip becomes more and more serious, and the roughness of the machined surface becomes greater and greater.

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Ronoh, Patrick Kipkurui, e Charles M. Mburu. "Common occupational machinery hazards in mechanical engineering workshops in TVET institutions in Nairobi metropolitan, Kenya". Journal of Agriculture, Science and Technology 22, n. 4 (2 agosto 2023): 142–49. http://dx.doi.org/10.4314/jagst.v22i4.9.

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The metal fabrication sector involves a variety of processes, activities, products, and by-products. This involves various interventions such as milling, turning, welding, drilling, and grinding. Firms in this sector use one or a combination of these interventions where machinery is used, which can expose workers to machinery hazards if proper safety procedures are not observed. Occupational Safety and Health (OSH) is vital in Technical Vocational Education and Training (TVET) institutions, especially in mechanical engineering programmes where metal fabrication is practised. The objective of this study was to assess the awareness of occupational machinery hazards in mechanical engineering workshops in TVET Institutions. The study adopted a descriptive research design and employed a structured questionnaire for data collection. Purposive sampling was used to identify institutions participating in the study. SPSS version 25 was used to analyse the data and present it in tables and graphs. Noise (90.4%) and vibration (71.9%) were reported as the most common occupational hazards, respectively, in mechanical engineering workshops. Regarding workstations, the grinding section (39.4%) and milling section (15.8%) were reported as experiencing high levels of noise. The study recommends that adequate control measures be put in place to mitigate against these hazards.

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Hu, Min Min, Yu Zhang e Sheng Wan Yuan. "Research and Application of Milling Parameters Optimization Based on Genetic Algorithm". Advanced Materials Research 1095 (marzo 2015): 820–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.820.

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At present a number of machinery factories select cutting parameters mainly rely on the experience in China. In order to get the reasonable cutting parameters and then have a optimal machining surface quality, high production efficiency and low production cost. In this paper, using genetic algorithm and Matlab software [1] to optimize cutting parameters of milling and combining with the actual cutting test in factory to verify the optimized data. And then provide theory basis and feasible measure for milling.

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Byotra, Deepak, e Rajesh Kumar Bhushan. "Computer Aided Process Planning for Machining the Gears". Advanced Materials Research 264-265 (giugno 2011): 1551–56. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1551.

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Bulk of power transmitting metal gears of machinery is produced by machining processes from cast, forged or hot rolled blanks. It includes a number of versatile machining operations that use a milling cutter, a multi tooth tool to produce a variety of configurations. The aim of the computer aided process planning (CAPP) is to develop a programme for milling cutting processes. This paper reveals the hybrid approach to computer aided process planning for milling and grinding operations on gear blank, so that the plan can be generated taking into account the availability of machines and the material. The developed computer aided process plan has reduced the set up time and machining time by 40.90 and 30.15 % respectively.

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Dua, Tran Van. "Combination of symmetry point of criterion, compromise ranking of alternatives from distance to ideal solution and collaborative unbiased rank list integration methods for woodworking machinery selection for small business in Vietnam". EUREKA: Physics and Engineering, n. 2 (22 marzo 2023): 83–96. http://dx.doi.org/10.21303/2461-4262.2023.002763.

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Woodworking industry plays an important role in the development of Vietnam’s economy. The efficiency of woodworking process depends a lot on the machinery used in the woodworking process. Selecting the best option among a variety of machines is tedious and complex work. However, if the choice of machine is based only on the subjective opinion of the customer, it will lead to mistakes. That mistake is understood that the customer will choose the option that is not the best among the machines proposed by the supplier. Instead, machine selection must be based on all machine parameters. This is called multi-criteria decision making (MCDM). There are MCDM methods, when used it is necessary to know the weights of the criteria. However, there are also methods that do not need to know the weights of the criteria. CRADIS (Compromise Ranking of Alternatives from Distance to Ideal Solution) is a method that, when used, is required to weight the criteria. In contrast, this problem is unnecessary when using the CURLI (Collaborative Unbiased Rank List Integration) method. In this study, three kinds of machinery commonly used for small business in woodworking field were selected. The three kinds of machinery mentioned in this study include wood milling machine, wood saw machine, wood planer. The SPC (Symmetry Point of Criterion) method was used to calculate the weights of the criteria for each kind of machinery. This is the youngest method among the methods of determining the weights for the criteria, it was only found in 2023. The two methods include CRADIS and CURLI were used to rank the machinery kinds. The result showed that in all the surveyed situation, the best alternative is always determined consistently when using CRADIS and CURLI methods. Accordingly, three best alternatives with three different machinery kinds (milling machine, saw machine and planer) were found in this study

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Cao, Shu Kun, Shang Wei Yang, Xiu Sheng Chen, Gui Cong Wang e Wei Wei Song. "Milling Machine Design Based on Open CNC System". Applied Mechanics and Materials 52-54 (marzo 2011): 887–92. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.887.

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Completed structure of milling machine design based on open CNC system through the combination of multi-axis motion controller and the way of NC embedded PC. The traditional CNC milling machine combined with technology of many aspects of Precision machinery, electronics, electric drive, automatic control, automatic detection, and computer and so on. High-precision high efficiency and high flexibility of the CNC milling machine makes it has more widely applications. But there are some problems, for example, based on the traditional CNC milling system for work-piece processing is also not very convenient, and traditional CNC system must be G code programming first, then process work-piece, in addition, as the closed nature of traditional CNC systems, products of hardware and software of the CNC manufacturers are not compatible, and system’s training and maintenance costs much, we put forward the open CNC system, then we start to research and analysis the Milling Machine Design Based On Open CNC System.

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Wu, Ming Yang, Rui Zhang, Yao Nan Cheng, Yue Zhang, Shuo An e M. Y. Li. "The Tool Path Planning and Simulation Analysis of Surface Flank Milling for Titanium Impeller Blade". Materials Science Forum 800-801 (luglio 2014): 654–59. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.654.

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The impeller is an important typical part of machinery and equipment industry, and is widely used in energy and power, aerospace, petrochemical, metallurgy and other fields. However, due to the complex shape of the impeller blades, forming more difficult. Flank milling have many advantages, such as forming good accuracy, high efficiency. Therefore, in the paper will choose flank milling for impeller milling. Based on the properties of titanium alloy material and the external characteristics of the impeller blades, proposed control method for machining distortion of impeller blades. Using three offset method to calculate the initial tool position of cylindrical cutter flank milling undevelopable ruled surface, then calculate the initial tool position of cone ball cutter to plan tool path of milling. Through the VERICUT software to simulate the whole process of the impeller flank milling, in order to verify the tool path planning and determine the interference between the tool and the workpiece, the tool and the workpiece does not occur. Finally, through experiments to verify the feasibility of planning algorithm. The trajectory planning and simulation of flank milling titanium impeller blades are foundation of improvement the processing efficiency of the impeller blades and better surface quality.

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Xin, Zhi Jie, e Hu Guo. "Modern Machinery Products Adaptability Vague Comprehensive Evaluation". Advanced Materials Research 201-203 (febbraio 2011): 1475–80. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1475.

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Modern mechanical products through comprehensive appraisal target analysis, adaptability of product evaluation model can be established. The NC Arc teeth gear milling machines, for example, applies multistage fuzzy synthetic evaluation methods, has carried on the synthetic evaluation to the product adaptability, provide the instruction for the modern structural design and the re-engineering.

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Abad, Rosalinda. "Rice Machinery Requirement in La Union, Philippines: A Basis for Prioritizing Deployment". Recoletos Multidisciplinary Research Journal 9, n. 2 (27 novembre 2021): 129–46. http://dx.doi.org/10.32871/rmrj2109.02.01.

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The implementation of the Republic Act No. 11203 mandates the development of a just and appropriate agricultural mechanization strategy. Thus, this study is conceptualized to calculate the rice machinery requirement and the mechanization level of La Union, Philippines. The utilization rate of existing machinery considers 100% and 70% in case the calculation is surplus. Furthermore, this aims to validate if there is no machinery requirement despite the 30% decrease in utilization rate. Hence, the results have revealed a need for 674 units of riding-type transplanters, 31 units of a rice combine harvester, 422 units of recirculating dryers, and 61 units of multi-pass rice mills. The rice mechanization level is moderately mechanized. However, only tillage operation is moderately mechanized; the transplanting, harvesting, drying and milling are low mechanised. These findings could serve as bases in the formulation of policies and strategies prioritizing suitable areas for machinery intervention in the province.

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Wang, Yan Xin, Xian Li Liu, C. X. Yue, Fei Xiao e P. Sun. "The Identification of Vibration Characteristics for Hardened Steel Based on Wavelet Energy Spectrum in High-Speed Milling". Advanced Materials Research 188 (marzo 2011): 162–65. http://dx.doi.org/10.4028/www.scientific.net/amr.188.162.

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A method to identify the effect of tool overhang on vibration signal is put forward to study machining process of large hardened steel automobile mold by wavelet energy spectrum. Firstly, collect the machinery vibration signal on milling by displacement sensor, then make a wavelet transform on time signal and calculate the wavelet energy spectrum of each frequency range. Finally, extract energy value of the right frequency by the method of homogenization. It is confirmed by experimental data that this method can recognize vibration feature and abnormal condition of cutting tool in high speed milling process of hardened steel fleetly and efficiently.

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gage, fran. "Wheat into Flour: A Story of Milling". Gastronomica 6, n. 1 (2006): 84–92. http://dx.doi.org/10.1525/gfc.2006.6.1.84.

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This article chronicles the milling of wheat beginning with its cultivation about ten thousand years ago. It describes the milling of the grain, starting with primitive hand tools, progressing to larger mills, then the use of animal power to turn milling stones. Changes in the design of the mills made them more efficient. Using flowing water to turn the millstone greatly increased output; people without access to flowing water devised mills turned by the wind. As wheat became a more important crop, an automated system, using elevators and gravity chutes, made it possible to mill even more grain. Technological advances led to changes——rollers replaced stones, steam replaced water, and electricity eventually replaced steam as the mill's energy source. Modern mills employ sophisticated machinery in an attempt to extract as much flour from the wheat kernels as possible.

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Veda Prakash, Mr Vodnala, Mr S. Suresh e Mr Algot Kiran Kumar. "PRE-MILLING FLEXIBLE FIXTURE REVIEW AND OPTIMISATION". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 9, n. 3 (17 dicembre 2018): 1300–1307. http://dx.doi.org/10.61841/turcomat.v9i3.14473.

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Machining requires correct workpiece location and restriction. Fixtures secure the workpiece for reproducibility, uniformity, and accuracy. The Workpiece Fixture System (WFS) minimises workpiece elastic deformation to improve machining quality. Elastic deformation impacts workpiece shape and precision. The workpiece's elastic deformation prevented even the most exact machinery from tightening tolerances. Deformation prediction and optimisation require much study. Batch or large production WFSs involve workpiece and fixture setup for machining. Fixture layout design (FLD) involves strategically placing locators and clamps around a workpiece to optimise machining and reduce machining forces. The right FLD holds the workpiece against cutting forces, minimising elastic deformation. FLDs depend on proper locator and clamp placement. FLD optimisation in WFS is essential for high-quality, low-cost machining.

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Mulyana, Mulyana, Jojo Sumarjo Sumarjo e Aripin Aripin. "Proses pembuatan flywheel (roda gila) mesin Hammer Mill dengan metode Drilling, Milling, dan Turning di PT. Raja Ampat Indotim". ARMATUR : Artikel Teknik Mesin & Manufaktur 5, n. 1 (22 marzo 2024): 62–70. http://dx.doi.org/10.24127/armatur.v5i1.4920.

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The research is aimed at the manufacture of flaywheel for hammer mill machines using the method of drilling, milling and turning, which aims to keep the engine rotation stable on the machine due to excess load and is a mass that rotates and is used as a storage of energy inside the machine. This research focuses on drilling, milling, and turning processes on low-carbon steels. (ST 40 Steel). The Flywheel is a component that is a plate that because of its weight can withstand drastic speed changes so that the rotation movement of the machinery shaft becomes more smooth. The drilling, milling and turning methods are machining methods that are widely used in the manufacturing industry. From the results of the research using the methods of drilling, milling and turning the following are on the process of making flywheel i.e. with the time of the drilling process of the production of sepie holes 62.82 minutes, the milling process of smoothing 2 surfaces of the work object 242.06 hours and the turning of the profile of 2 surface work object 117.6 hours with a total production time of about 15 days. Therefore, the results of this research provide useful guidance for the industry to optimize the drilling, milling and turning processes in flywheel manufacturing.

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Tsai, Ming Chang, Te Ching Hsiao e Shyh Chour Huang. "Analysis of the Effect the Modal-Parameter on the Milling Stability". Applied Mechanics and Materials 372 (agosto 2013): 459–62. http://dx.doi.org/10.4028/www.scientific.net/amm.372.459.

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In the past few years, it has become a tendency to develop machinery of high speeds and high precision. In order to meet the need for high-speed manufacturing of high precision components, the machine tools structure must be very stiff and have high cutting stability levels. Should the process of the firsthand milling be unstable, the effects include cutting tool breakages, decrease in surface accuracy and could even shorten the machine tolls lifespan. Thus, in the manufacturing of milling, chattering often causes problems for the manufacturer. To prevent cases of milling chattering, there is a need to use a chatter stability lobe to predict the chatter stability and to analyze the effect the modal-parameter has on the stability of milling. This research paper uses the Zero-Order Analytical Method (ZOA) to analyze and compare the effects modal-parameter (natural frequency, damping ratio, modal stiffness) has on the stability of the milling system. The results show that level of stiffness and the damping ratio influences the vertical shape of the chatter stability lobes while the natural frequency affects the lateral shape of the lobes.

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28

Magomedov, M. D., e V. V. Stroyev. "IMPROVING THE TECHNICAL LEVEL OF AGRICULTURAL AND FLOUR MILLS AS A DIRECTION OF INCREASING EXPORTS WHEAT AND ITS PROCESSED PRODUCTS". Scientific Journal ECONOMIC SYSTEMS 13, n. 2 (2020): 124–34. http://dx.doi.org/10.29030/2309-2076-2020-13-2-124-131.

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The article defines the technical level of production, indicates the great physical and moral wear of machinery and equipment of agricultural and flour mills. Considered for what purposes machines are used in wheat production, it is recommended to agricultural and flour-milling enterprises to allocate preferential credit at the level of percentage inflation. All technological methods used in wheat production are presented, the main types of products produced at flour mills are considered. Are indicated as having shortcomings in the introduction of advanced machinery in the country’s flour mills. Shows the importance of production organization in the use of advanced equipment and technology at the enterprises under consideration.

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Widodo, E. M., T. A. Purnomo e N. Ariyanto. "Machinery parameter optimization of CNC milling programming towards process time". Journal of Physics: Conference Series 1517 (aprile 2020): 012044. http://dx.doi.org/10.1088/1742-6596/1517/1/012044.

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30

Sun, Xing Wei, Hong Cui, Ke Wang e B. Wang. "Research on NC Manufacturing of Slender Helical Curved Surface". Materials Science Forum 626-627 (agosto 2009): 589–92. http://dx.doi.org/10.4028/www.scientific.net/msf.626-627.589.

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Abstract (sommario):

Along with the development and advance of science and technology, the quantity demanded of high technology and high performance mechanical equipment, such as screw pump, screw compressor, elastic and plastic extruder, steam turbine, blast engine and turbine, and so on, is great more and more in present society. And the requirement of performance is high more and more. The application of these products is widespread in many major industry fields of national economy, including military, petroleum, machinery, aviation, energy, chemical industry, elastic and plastic industry, etc.. The key part of these products is the rotor with special complex helical curved surface and leaf blade with particular slender curved surface. The machining level of them makes effect on the product performance and quality directly. In this paper, modern manufacturing technology, which makes use of tool nose’s NC trace of revolving disk milling cutter and whirlwind milling cutter to envelope milling slender curved surface by combined moving of several coordinate axes on special NC milling machine, was studied. The principle of the new technique was represented. The application instances are given in this paper.

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Avila Quispe, Carlos Alejandro, e Denis Adriann Romero Chingay. "Lean manufacturing como herramientas para aumentar la productividad en la empresa Piladora del Valle S.R.L." Concordia 2, n. 3 (1 marzo 2022): 10–17. http://dx.doi.org/10.62319/concordia.v.2i3.9.

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Abstract (sommario):

In this study, the objective was to apply Lean Manufacturing tools and evaluate the productivity of the milling company Piladora del Valle SRL. The study was of an applied type, with a quantitative approach and pre-experimental design. The population and sample of the study were the production processes of the milling company belonging to the raw rice line. The instruments used for data collection were an observation guide and a productivity recording sheet. The data were analyzed using the parametric T-Student test. The results of the study showed that the application of Lean Manufacturing managed to improve the productivity of the milling company. The improvement was 31.7% in the labor factor and 21.6% in the machinery factor. This meant a growth of 10.87% in total productivity. In conclusion, the study demonstrated that the application of Lean Manufacturing is an effective tool to improve productivity in manufacturing companies.

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Hermana, Rifki, Yuris Setyoadi e Muhammad Fahrur Aza. "KAJI EKSPRIMENTAL PEMBANDINGAN KETELITIAN MESIN CNC MILLING DENGAN KONTROL SMC DAN MESIN CNC MILLING DENGAN KONTROL ESP32 WIFI". Majalah Ilmiah Gema Maritim 24, n. 2 (30 settembre 2022): 105–13. http://dx.doi.org/10.37612/gema-maritim.v24i2.299.

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Abstract (sommario):

Computerized Numerical Control (CNC) is one of the developments of automatically operated machining technology that can support the need for the demand for a product that has a complex shape, high accuracy and can work on objects that cannot be done with conventional machinery. CNC Milling in the industry still has an expensive price, both the price of the hardware and software used to operate the CNC Milling machine. Therefore, CNC milling machines are only used in large industries while the middle and lower industries still use CNC milling machines. This makes medium-sized industries less competitive with large industries in production results, both in terms of speed efficiency and accuracy. then research was carried out in the form of CNC design and design that uses an ESP32 wifi-based Offline Controller as an application that supports the CNC machine work process. This research is an experiential review of comparing the accuracy of CNC milling machines with SMC controllers and CNC milling machines with ESP 32 wifi controllers. From the results of the tests carried out as many as 10 times the milling machining process using CNC with SMC control obtained three values that exceeded the tolerance limit, namely one each on the dimensions of length, width and height or depth. While the results of the milling process using a CNC milling machine with ESP32 wifi control obtained six values that exceeded the tolerance limit, namely two each on the dimensions of length, width and height or depth. So it can be concluded that CNC with SMC control is more accurate because the percentage of failures is less compared to CNC with ESP32 wifi control

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33

Zubarev, Yuriy, e Alexsandr Priyomyshev. "Effectiveness increase of flat deep grinding". Science intensive technologies in mechanical engineering, n. 8 (1 settembre 2021): 41–46. http://dx.doi.org/10.30987/2223-4608-2021-8-41-46.

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Abstract (sommario):

There is considered a possibility of effectiveness increase of machinery billet flat deep grinding at the expense of high-speed machining use and also grinding on an automatic cycle of grinding mode changes. The application of high-speed deep grinding, for instance, slots or profiles of turbine blade locks allows rejecting their preliminary milling, carrying out single position machining on one machine which increases machining accuracy and its capacity.

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34

Liu, De Ping, Wei Wei Yang e Jian She Gao. "Simulation on Motion Reliability of Five-Axis Turning-Milling Center". Applied Mechanics and Materials 80-81 (luglio 2011): 1041–45. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.1041.

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Abstract (sommario):

Five-axis turning-milling center is an important and advanced NC machine in fields of military industry, aerospace, automobile and medical machinery. The model of machining center is established by using ADAMS and designing the variable parameters. The error of machining center is simulated by Monte Carlo method. The command file is compiled to simulate the machining center and the motion reliability is computed using simulation results. The whole process avoids establishing and solving complicated mathematical equations. So, it is an effective method for the analysis and computation of motion reliability. Compared with traditional methods, this method is more accurate and quick and it is suitable for complicated mechanism.

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35

Sonief, Achmad As’ad, Moch Syamsul Ma'arif, Pratikto Pratikto e Hans Juliano. "COMPARISON OF CHATTER CONTROL OF VARIABLE AND REGULAR HELIX TOOLS IN THE ALUMINUM END-MILLING PROCESS". International Journal of Mechanical Engineering Technologies and Applications 4, n. 1 (31 gennaio 2023): 51–60. http://dx.doi.org/10.21776/mechta.2023.004.01.6.

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Abstract (sommario):

In the chatter, machining operations are undesirable because of the phenomena that affect product results, machining accuracy, tool life, and high operating value. Chatter is a vibration phenomenon that occurs in cutting tools due to the self-excitation of the influence of cutting parameters during the operation process of the machine. Types of chatter in machinery are regenerative and resonant. Because the pitch angles of variable helix tools vary, the helix angles of variable tools produce different tooth passing frequencies on each tool eye next to each other and can be used to prevent and control resonance. This study aimed to compare chatter control from the variable helix and regular-angle tools in the aluminum end milling process. The method is carried out through the end milling process experiment to determine the chatter control of the variable helix and regular-angle tools through the stability loop diagram. The results from this study were obtained by comparing control chatters in the milling process through controlling variable and standard helix angles as a guideline to produce the best surface roughness in the end milling process made from aluminum. The comparison of estimated control charts from variable helix tools is more comprehensive than regular helix tools.

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36

Azis, Miftahul, Wahida, Sumedi, Rangga D. Yofa, Sarah I. Iffah, Imaduddin Sahabat, Purwanto e Fajar Setiawan. "Market performance of rice in Banten Province: A structure-conduct-performance approach". BIO Web of Conferences 119 (2024): 02012. http://dx.doi.org/10.1051/bioconf/202411902012.

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Abstract (sommario):

The presence of the modern rice milling industry affects the supply of unhusked grain and rice in Banten Province. Due to larger storage capacity, processing machinery, and efficient business processes, the industry has gained comparative and competitive advantages over other industries in the current market structure. The aim of the study is to analyse the structure, conduct, and performance of the unhusked grain and supply chain from the primary data. The findings revealed that the presence of the modern rice milling industry has short-term effects on the unhusked grain and rice supply chain and has the potential to transform the structure of the unhusked grain and rice market in the long term. This shift also impacts the roles and sustainability of the small- and medium-scale rice milling industries. In the future, market performance will be characterised by an increasing level of competition among entities to secure higher supplies of unhusked grain for processing into rice. The recommended policy changes aim to increase rice production and enhance the regional government’s role through a regional state-owned food business entity in the rice market. Furthermore, the revitalisation of smalland medium-scale rice milling industries demands government support to enhance their operational efficiency.

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37

Savvateeva, I., G. A. Kokieva, D. Radnaev e A. G. Pekhutov. "Study of the mechanical impact of agricultural machinery on the soil". IOP Conference Series: Earth and Environmental Science 937, n. 3 (1 dicembre 2021): 032051. http://dx.doi.org/10.1088/1755-1315/937/3/032051.

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Abstract The performance of spring field work in the best agrotechnical terms and with high quality is provided by well-trained equipment. The recommendations provide for four stages of work related to the adjustment of machines and quality control of technological operations: control of working bodies and components of machines after repairs or new ones are delivered; technological adjustments of machines; verification of technological adjustments in the field; quality control of technological operations in the field. As a criterion for the efficiency of the use of energy resources in agriculture, some foreign sources recommend the output of agricultural products per unit of energy used. The article describes the regression equations that can be used to characterize the process of grinding sedge hummocks on the root with a milling cutter. Statistically significant factors affecting the degree of grinding of the hummock are the speed of rotation of the working body, the distance between the tiers of knives, the speed of movement, the angle of taper of the rotor and the angle between the knives on adjacent tiers. Thus, layer-by-layer milling most fully meets the requirements of pre-sowing tillage on land in the oatmeal zone.

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38

Paman, Ujang, Khairizal, Selvia Sutriana, Zulhanafiah e Andri Bayu Pamungkas. "Evaluation of Operator’s Competence to Operate and Maintain Farm Machines in Riau Province, Indonesia". IOP Conference Series: Earth and Environmental Science 1228, n. 1 (1 agosto 2023): 012014. http://dx.doi.org/10.1088/1755-1315/1228/1/012014.

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Abstract The operation of farm machinery requires an operator with better operational and technical skills to ensure efficient and effective use of the machinery. These competences are necessary to avoid breakdowns during field operations that can affect machine operating costs. This research aims to evaluate the operators’ competence in the operation and maintenance of farm machinery. Field surveys were conducted in three regencies of the Riau Province, namely Kampar, Indragiri Hulu, and Siak regencies. 63 machine operators were purposively selected and interviewed using structured questionnaires. The collected data were analyzed using the descriptive-quantitative technique. The type of farm machines operated by the operators in the province included two-wheel tractors, four-wheel tractors, water pumps, rice transplanters, power threshers, combine harvesters, and rice milling units. Most operators can operate more than one type of farm machine. The competency of most operators to repair farm machinery is very poor because of a lack of training. Most operators get skills in machine operators from self-learning and other operators (friends). Therefore, the results suggest that machine operators must be well-trained in operational and technical skills, especially in the excellent operation and proper maintenance of farm machines, to avoid machine damage during field operation.

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39

Dai, Mingyuan, Liangpeng Li, Yilin Lu, Liwei Xiao, Xuemei Zong, Chenglong Tu, Fanjian Meng, Yong Tang e Dongliang Guo. "Research on Holographic Visualization Verification Platform for Construction Machinery Based on Mixed Reality Technology". Applied Sciences 13, n. 6 (14 marzo 2023): 3692. http://dx.doi.org/10.3390/app13063692.

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Abstract (sommario):

As “Industry 4.0” progresses, construction machinery is evolving toward large-scale, automation, and integration, resulting in the equipment becoming increasingly sophisticated, and the designs more difficult. Labor costs, transportation, and time will be huge challenges for construction machinery, and mixed reality technology is one of several possible ways to solve this challenge. The research presented in this paper develops a holographic visual verification platform for a digital prototype of construction machinery based on virtual terminal equipment, through investigating the synchronous remote collaboration of multiple terminal devices in a mixed reality scenario. These included semi-physical virtual-real fusion assembly, multi-person real-time voice communication, dynamic loading of MR model based on a cloud server, virtual imitation control, interface design, and human-computer interaction. The effectiveness of this paper’s method is demonstrated through remote collaborative design cases. These included a double drum roller, loader, and milling planer welding production line, as well as tractor modeling review and virtual simulation manipulation of an aerial work platform. The experimental results show that this visual verification platform is a feasible, low-cost and scalable solution, which brings a qualitative breakthrough to the design, research and development, production and other stages in the field of construction machinery.

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40

Jamil, N., M. F. Hassan, S. K. Lim e A. R. Yusoff. "Predictive maintenance for rotating machinery by using vibration analysis". Journal of Mechanical Engineering and Sciences 15, n. 3 (19 settembre 2021): 8289–99. http://dx.doi.org/10.15282/jmes.15.3.2021.07.0651.

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Abstract (sommario):

This paper presents a complete and well tested virtual instrument (VI) for computer numerical control (CNC) machine predictive maintenance. The national instrument (NI) hardware, LabVIEW software and accelerometer sensor are acquired for the vibration analysis integrated with virtual instrument were developed based on the vibration severity chart threshold in ISO 10816. Validation experiments of the predictive maintenance module were utilized on drilling and milling processes to test and verify the effectiveness of the module. Results obtained from current module can monitor and provide the machine conditions at different condition of good, satisfactory, unsatisfactory, and unacceptable for rotating machinery status according to the vibration severity chart as per ISO 10816.

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41

Zubarev, Yuriy, e Alexsandr Priyomyshev. "Flat grinding effectiveness increase due to rational work cycle use". Science intensive technologies in mechanical engineering 2020, n. 9 (18 agosto 2020): 7–11. http://dx.doi.org/10.30987/2223-4608-2020-9-7-11.

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Abstract (sommario):

A possibility for machinery billet machining effectiveness increase at the expense of the use of high-speed grinding machines operated in an automated cycle of machining mode changes is considered. It allows performing operations of roughing and then finishing ensuring the required accuracy and quality of surfaces worked. The application of high-speed force grinding allows rejecting rough and finish preliminary milling and, in such a way, decreasing the number of machine equipment, hard-alloy cutters, production areas and increasing labor productivity.

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42

Pavlenko, Ivan, Serhii Kononenko, Krystian Czernek, Stanisław Witczak, Sergey Dobrotvorskiy, Yevhenia Basova, Vitalii Ivanov et al. "An Increase in the Energy Efficiency of Axial Turbines by Ensuring Vibration Reliability of Blade Milling". Energies 16, n. 3 (3 febbraio 2023): 1511. http://dx.doi.org/10.3390/en16031511.

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Abstract (sommario):

Ensuring the vibration reliability of power equipment is one of the fundamental problems in modern power machinery. This problem has become more critical due to a permanent increase in the machining performance of high-speed milling of axial turbine blades. This article aims to identify reliable vibration parameters for high-speed milling of turbine blades to increase the energy efficiency of gas and steam turbines. For this purpose, mathematical models of free and forced oscillations of turbine blades during machining were developed. As a result of considering experimental and finite element analysis data, critical frequencies and corresponding mode shapes of free oscillations were identified using regression procedures by the best fit of analytical and empirical approaches. Additionally, after considering the forced oscillations of blades during high-speed machining, the magnitude of the specific cutting force and external damping ratio in the system ‘axial turbine blade and milling head’ were evaluated. The resulting magnitude of forced oscillations during machining was calculated. Finally, the amplitude–frequency response was also assessed, considering the machining parameters. Overall, the proposed methodology increases energy efficiency due to a decrease in the obtained machining quality of turbine blades.

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43

Bastian, Indra. "Machine Maintenance Policies in Local Sugar Manufacturing: A Case Study of Madukismo, Indonesia". Journal of Digital Science 5, n. 1 (25 giugno 2023): 23–32. http://dx.doi.org/10.33847/2686-8296.5.1_3.

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Abstract (sommario):

This study aimed to analyze the factors that cause un-optimal on a maintenance of machinery in P.G Madukismo. An engine maintenance which was carried out by P.G Madukismo for 6 months, had not been able to suppress an engine stop time. In 2016 the planned engine stop time in P.G Madukismo was on 88.8 hours, but in reality the P.G Madukismo engine stopped clock reached on 179.44 hours during a milling season. By exploring a case study approach, data collection was examined by interviews, observation and documentation. The data collected was analyzed using the reduction, data presentation and concluding withdrawal stages. The results of this study indicated that the main factors that caused engine maintenance had not been optimal because the useful life of the machine had been exhausted and preventive maintenance that was carried out cannot replaced all engine components that were damaged or worn. In addition, P.G Madukismo also did not have a SOP related to machine maintenance. Efforts that had been made to optimize machine maintenance were preventive maintenance, which was carried out not only outside the milling season but also during the milling season and provided training to employees to improve employee capabilities.

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44

Abou-EJmagd, A. E., M. M. Ibrahim e S. M. Abdellatif. "THE RELIABLE SELECTION OF A RICE MILLING MACHINERY SYSTEM FOR EGYPTIAN CONDITIONS". Journal of Soil Sciences and Agricultural Engineering 27, n. 9 (1 settembre 2002): 6313–29. http://dx.doi.org/10.21608/jssae.2002.255357.

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45

Yadav, Rohit Suresh. "Management Information System for Milling Section at Sugar Factory". International Journal for Research in Applied Science and Engineering Technology 10, n. 1 (31 gennaio 2022): 1052–56. http://dx.doi.org/10.22214/ijraset.2022.39992.

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Abstract: One of the most important goals in any organization is increasing work force productivity Information systems, Systems are the responsibility of their data and their processing of information within the organization and managers to provide information on important economic decisions making. Hutatma Sahakari Sakhar Karakhana. Ltd. is well known sugar industry having 5000 tccpd to 6000 tccpd capability along with new constructed new ethanol plant and using different facility in this factory such as leveller, fibrizor, kicker, TRPS rolling mill, elevator, boiler, pan and centrifuge. Management Information System (MIS) in increasing human resource productivity. Savings in labor, increased consumer surplus, improved customer service quality, improved organizational efficiency, quicker response to customers, deeper knowledge and understanding of customers. The purpose of this Project is to surveying the effect of management information system of productivity and its elements such as work speed, work cost, work accuracy (efficiency) and supervision and control status improvement, planning status improvement and make decision status improvement (effectiveness) of overall machine, man and material to improve performance of all over machinery, information systems.

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Furmanov, Denis, Vladimir Chizhov, Ivan Tyuremnov e Denis Troshin. "Loads on cutter teeth for removing asphalt pavement". E3S Web of Conferences 97 (2019): 06031. http://dx.doi.org/10.1051/e3sconf/20199706031.

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Abstract (sommario):

Machines and equipment for asphalt pavement milling are widely used throughout the world. With the growth of road construction, the demand for this class of machinery also rises. At the same time, the optimization of design and technological parameters of the milling machines is impossible without a comprehensive study of processes of milling asphalt concrete with the working elements of a cutter. The article provides a brief overview of different approaches to find out the loads on the working bodies of various machines, as well as indicates the advantages and disadvantages of these approaches. We describe the design of a pendulum stand used to study the processes of milling asphalt concrete with a single tooth cutter. We also describe the method of operation of such a stand. The design of the pendulum stand allows us to determine the cutting work, the average, and the instantaneous cutting forces. The work also provides the result of tests of cutting elements during their interaction with samples of asphalt concrete of different grades that are widely used in road construction. We also show the non-linear dependence of cutting resistance forces on the temperature and thickness of penetration of a cutting element. It is noted that working with a slight tooth penetration leads to low energy efficiency of the work process. It is also noted that temperature affects cutting resistance forces significantly less in asphalt concrete containing high amount of gravel.

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47

Huang, Jie, e Hong Jun Liu. "Research and Practice on the End Face Cylindrical Cam NC Machining Technology". Applied Mechanics and Materials 220-223 (novembre 2012): 406–9. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.406.

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This paper discussed the CAD / CAM technology of the end face cylindrical cam. The processing of end face cylindrical cam which used in textile machinery was analyzed, and the Processing plan was determined. Three-dimensional modeling and NC programming were done by respectively using PRO/E software and CAXA manufacture engineer software, machining accuracy, fixture and other key technical problems in the end face cylinder cam CAD/CAM process were solved. Acceptable product was processed in common three coordinates milling machine, and ultimately used in enterprises, and achieved good results.

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48

Anthymidis, K. G., A. Balouktsis, Kostas David e A. Trakali. "Wear of Cutting Tools Used in Milling Treatments". Key Engineering Materials 465 (gennaio 2011): 165–68. http://dx.doi.org/10.4028/www.scientific.net/kem.465.165.

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Abstract (sommario):

The usage of Computer Numerical Controlled Machines has been generalized over the last decades due to the increased demands for the production of mechanical parts with précised dimensions, higher production rates and products with better treated surface quality. It is well known that the duration of life of a cutting tool is one of the most important parameters during the cutting of metal parts, because it affects the cost of the manufacturing process substantially. Therefore, it is important to know accurately, the relation between the duration of life of the cutting tool and the conditions of the machinery such as cutting velocity, feed rate (fz), the depth of cut (radial and axial) etc. The purpose of this research is to conduct a proper number of cutting experiments in milling, measuring the wear of the cutting tools, in order to conclude in a mathematical model the wear cutting tool. This model can be implemented for the prediction of the cutting tool life, which is very important for the determination of the best cutting conditions. From the experimental diagrams we can come to conclusions for the course of the wear of the cutting tool in connection with the velocity of cutting, for the machinability of the materials used etc. The wear of the used cutting tools was determined by means of optical microscopy and stereoscopy.

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49

Bai, Qing Shun, Ying Chun Liang, Kai Yang, Zhi Luo e Xiao Yan Fang. "Modeling and Micro-Milling Experiments on Complex 3D Micro-Mould Parts". Key Engineering Materials 431-432 (marzo 2010): 413–16. http://dx.doi.org/10.4028/www.scientific.net/kem.431-432.413.

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Abstract (sommario):

Micro-mould is a necessary and productive component for the development of MEMS. However, the machining of micro-mould parts with complex 3D surfaces becomes the key problem for the development of micro machinery. In the paper, a new machining technique was introduced to manufacture micro-mould parts. With a reverse engineering technique, point cloud data were acquired and reconstructed into a 3D model of micro mould part in a computer. The numeral control code for micro-machining was also processed with the help of micro-machining simulation. The machining experiment on micro-parts with complex 3D surfaces was conducted on self-developed micro machine tools with micro-diameter ball-end cutter. High quality micro mould parts with complex 3D surfaces were obtained under these micro-milling experiments. The results will provide a perspective resolution on the manufacturing of micro-mould parts with complex surfaces.

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50

Molchanov, Alexander A., Andrey N. Zayatzev e Yulia P. Alexandrova. "Identification of the self-oscillating mode in metal-cutting machines in the production of agricultural machinery". E3S Web of Conferences 390 (2023): 06009. http://dx.doi.org/10.1051/e3sconf/202339006009.

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Abstract (sommario):

The production of modern agricultural machinery includes various technological chains machining workshops, consisting mostly of turning and milling machining centers. The influence of self-oscillations on the dynamic characteristics of mechanisms for various purposes is due to the increased requirements for the quality and reliability of products of modern machines and units. Timely detection and reduction of the impact of oscillatory processes makes it possible to qualitatively optimize the design of mechanisms. A special role in the process of operation is exerted by self-oscillations on metal-cutting machines in the processing of materials. The consequence of the self-oscillatory process is a violation of the performance of a metal-cutting machine, expressed in a parametric (accuracy) failure. In this paper, the possibility of using parametric spectral analysis for the early identification of a self-oscillating process in hexapod machine tools was evaluated, for which the objective function was determined, i.e. the value of the damping coefficient of the dynamic system.

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