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Auswahl der wissenschaftlichen Literatur zum Thema „Headstock of horizontal machine tool“
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Zeitschriftenartikel zum Thema "Headstock of horizontal machine tool"
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Xu, Yakai, Weiguo Gao, Yuhan Yu, Dawei Zhang, Xiangsong Zhao, Yanling Tian und Huaying Cun. „Dynamic Optimization of Constrained Layer Damping Structure for the Headstock of Machine Tools with Modal Strain Energy Method“. Shock and Vibration 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/2736545.
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Dynamic stiffness and damping of the headstock, which is a critical component of precision horizontal machining center, are two main factors that influence machining accuracy and surface finish quality. Constrained Layer Damping (CLD) structure is proved to be effective in raising damping capacity for the thin plate and shell structures. In this paper, one kind of high damping material is utilized on the headstock to improve damping capacity. The dynamic characteristic of the hybrid headstock is investigated analytically and experimentally. The results demonstrate that the resonant response amplitudes of the headstock with damping material can decrease significantly compared to original cast structure. To obtain the optimal configuration of damping material, a topology optimization method based on the Evolutionary Structural Optimization (ESO) is implemented. Modal Strain Energy (MSE) method is employed to analyze the damping and to derive the sensitivity of the modal loss factor. The optimization results indicate that the added weight of damping material decreases by 50%; meanwhile the first two orders of modal loss factor decrease by less than 23.5% compared to the original structure.
2
Zhang, Yao Man, Qi Wei Liu und Jia Liang Han. „Finite Element Analysis on Thermal Characteristic of the Headstock of NC Machine Tool“. Advanced Materials Research 291-294 (Juli 2011): 2302–5. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2302.
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The final manufacturing performances of the machine tools will be influenced by its thermal characteristics seriously and accurately predict thermal characteristic is helpful to improve the machine design level. Based on the analysis on factors that influence machine thermal characteristic, finite element analysis model of the headstock has been constructed, and the steady temperature field distribution and thermal equilibrium time calculation of the headstock are calculated, and then the temperature field and thermal deformation of the headstock under the action of heat and structure load have been calculated, and analysis to identify the trend of the spindle assembly and headstock heat distortion are also been done. The analysis reveals the machine processing performance influence will be influenced by the hot asymmetric, the study give priority to spindle assembly of optimization design, thermal error compensation.
3
Zhang, Yao Man, Jia Liang Han und Ren Jun Gu. „Thermal Characteristic Analysis on the Headstock of a High Precision CNC Machine Tool“. Applied Mechanics and Materials 201-202 (Oktober 2012): 157–61. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.157.
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The performances of the precision machine tool will be influenced by its thermal characteristics seriously, and accurately predict the thermal characteristic of the key component of the machine tool is helpful to improve the design level. The headstock of a high precision CNC lathes has been regarded as the research objects, and the thermal properties and its influence on the performance of the machine tool are studied. Finite element analysis model of the headstock has been constructed, and the simulation calculations of the steady temperature field distribution and thermal equilibrium time of the headstock are calculated, and then the analysis to identify the thermal deformation trends of the spindle assembly and the heat distortion of the headstock are also been done. Some of the key factors that have significant influence on the thermal characteristic of the high precision machine tools are also studied. The analysis reveals that the performances of the machine tool will be influenced by the hot asymmetric, the study lays a foundation for the optimization design and thermal error compensation of the spindle assembly.
4
Cheng, Feng Lan, und Feng He Wu. „Topology Optimization of Headstock of Heavy Machine Tool“. Advanced Materials Research 305 (Juli 2011): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amr.305.442.
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The problem of topology optimization of large spindle box of heavy machine was studied. Based on ICM topology optimization, the parameters topology optimization were changed by sensitivity analysis and the sensitivity parameters were normalized; the topological parameters were modified and removed which judgment based on the sensitivity of the cross-section unit cell in the progress of optimization. Example shown that the integrated optimization method made the structure optimization more intuitive, not only avoided effectively the occurrence of the load strange in the optimization process, but accelerated the convergence speed.
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Sang, Lu Ping. „Turning-Milling Machining Center of Each Axis Movement Principle and the Headstock Structure Analysis“. Advanced Materials Research 912-914 (April 2014): 878–81. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.878.
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Turning milling machining center are analyzed the structure and working principle of headstock of numerical control machine tool headstock consists of motor, drive system and components of the head of a bed, is mainly used to achieve the main movement of the machine tool. Spindle structure adopts precision double row cylindrical roller bearing and two-way thrust angular contact ball bearing group and type. The machine is the best combination of lathe and milling machine. Configuration French NUM1060 system, realize five axis control, a loading card can complete a variety of difficult machining of complex.
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Wang, Yahui, Ling Shi, Yiqi Dang, Shengkai Sun und Huipeng Zhang. „Application of the Headstock of CNC Boring Machine for Tractor Engine Cylinder Block Based on Multi-Objective Genetic Algorithm“. Applied Engineering in Agriculture 37, Nr. 2 (2021): 343–49. http://dx.doi.org/10.13031/aea.14459.
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HighlightsThe headstock of the single-sided horizontal CNC boring machine specializing in processing tractor 6-cylinder engine cylinders is optimized.The constraint conditions such as tooth width and modulus are constructed. The model is optimized by the NSGA algorithm, and the optimization results are good.The optimization results of the NSGA algorithm are compared with the results of the weighted sum method and the GA, which highlights the superiority of the NSGA algorithm.ABSTRACT. The tractor is one of the most frequently used equipment in agricultural production, and its mass production is the general trend. With the continuous advancement of the global industrialization process, the importance of Computer Numerical Control (CNC) machine in the entire industrial production has become more and more prominent, and the application of CNC machine in tractor manufacturing has greatly improved production efficiency. This article takes the headstock of a single-sided horizontal CNC boring machine dedicated to processing tractor 6-cylinder engine cylinders as the research objective, takes the key parameters of the gear train in the headstock as the optimization design variables, constructs constraints, such as modulus, tooth width, etc., establishes a multi-objective optimization mathematical model, uses the Non-dominated Sorting Genetic Algorithm II (NSGA-II) to process the model and obtains the Pareto solution set through multiple iterations. The optimization results show that the volume, center distance and the reciprocal of coincidence degree of the main shaft 1 transmission group are reduced in varying degrees. Finally, it is compared with the weighted sum method and genetic algorithm (GA) to highlight the superiority of NSGA-II. Keywords: Headstock, Multi-optimization, Non-dominated Sorting Genetic Algorithm II, Tractor cylinder.
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Li, Zhe, Song Zhang, Yan Chen, Peng Wang und Ai Rong Zhang. „Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center“. Materials Science Forum 836-837 (Januar 2016): 348–58. http://dx.doi.org/10.4028/www.scientific.net/msf.836-837.348.
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Dynamic characteristics of numerical control (NC) machine tools, such as natural frequency and vibration property, directly affect machining efficiency and finished surface quality. In general, low-order natural frequencies of critical components have significant influences on machine tool’s performances. The headstock is the most important component of the machine tool. The reliability, cutting stability, and machining accuracy of a machining center largely depend on the structure and dynamic characteristics of the headstock. First, in order to obtain the natural frequencies and vibration characteristics of the headstock of a vertical machining center, modal test and vibration test in free running and cutting conditions were carried out by means of the dynamic signal collection and analysis system. According to the modal test, the first six natural frequencies of the headstock were obtained, which can not only guide the working speed, but also act as the reference of structural optimization aiming at frequency-shift. Secondly, by means of the vibration test, the vibration characteristics of the headstock were obtained and the main vibration sources were found out. Finally the corresponding vibration reduction plans were proposed in this paper. That provides the reference for improving the performance of the overall unit.
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Sheng, Zhong Qi, Chang Chun Liu, Jian Yong Wang und Liang Dong. „Research on Thermal Characteristic and Thermal Compensation Technology of Spindle System of CNC Machine Tool“. Advanced Materials Research 490-495 (März 2012): 1595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1595.
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The paper mainly studies the thermal characteristic and methods of thermal compensation of the spindle system of a precision turning center. The three-dimensional model of spindle system is constructed and meshed by ANSYS Workbench. The boundary condition and heat source of the spindle system are computed by relevant theory and the results are applied to the finite element model. By comparing results of FEM and experiment, the boundary condition is adjusted if necessary to make the analysis results be similar to experimental results. Then the temperature field is used as a load to calculate the thermal deformation. Two ways of changing boundary condition of spindle system have been analyzed to find their influence on spindle thermal deformation, which are changing air flowing speed around headstock and setting up a cooling jacket at the front surface of the headstock respectively.
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Brecher, C. Prof, und M. Klatte. „Sensorischer Spindelstock zur Thermo-Korrektur*/Sensory headstock for thermo compensation“. wt Werkstattstechnik online 107, Nr. 07-08 (2017): 500–506. http://dx.doi.org/10.37544/1436-4980-2017-07-08-24.
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Vorgestellt wird ein Sensorkonzept zur integralen Dehnungsmessung für Werkzeugmaschinenstrukturen. Mithilfe dieser Sensoren ist die Implementierung traditioneller sowie neuartiger Methoden zur steuerungstechnischen Korrektur thermisch bedingter Tool-Center-Point-Verlagerungen möglich. Die Sensoren wurden im Spindelstock einer 3-achsigen Vertikalfräsmaschine umgesetzt sowie Korrekturkonzepte mit unterschiedlichen Modellierungsverfahren validiert. In this paper, a sensor concept for integral strain measurement in machine tool structures is introduced. With the help of these sensors the implementation of both traditional and novel methods for the control-based compensation of thermally induced tool center point dislocations is possible. The sensors have been integrated in the headstock of a 3-axis vertical milling machine. Furthermore, correction concepts with different modeling methods have been validated.
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Sun, Guo Yan, Jian Hua Zhang, Hao Yang und Gang Li. „Modal Analysis of Artificial Granite Grinding Machine Tool Bed“. Advanced Materials Research 971-973 (Juni 2014): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.573.
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Machine tool bed, which supports headstock, tailstock and other functional components, is one of the important structure parts of machine tools. Precision grinding machine tool beds are designed by the authors with artificial granite and cast iron respectively for research. Their three-dimensional models were established via software SOLIDWORKS and then imported into the finite element software (ANSYS) to simulate for the first eight modal frequencies and the corresponding vibration modes. Simulation results show that the first eight order natural frequencies of artificial granite bed are better and the corresponding maximum amplitude of vibration modes are decreased significantly than cast iron bed. The dynamical properties of artificial granite bed are obviously better than grey cast iron bed.
Dissertationen zum Thema "Headstock of horizontal machine tool"
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Lekeš, Petr. „Návrh a optimalizace tělesa vřeteníku pro obráběcí stroj“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444267.
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This diploma thesis deals with the design and optimization of a headstock for machine tool. Thesis was focused to comparison of several types of slide-ways and linear guides of headstock, considering their static and dynamic rigidity. An overview in the field of machine tools, their static and dynamic properties, use materials and design of headstocks, considering types of guideways, types of guideways drives and types of drives of spindle was made. Among the other main goals is included design of several types of guideway of headstock for horizontal machine tool, elaboration of computational models and evaluation of results.
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Vazovan, Ľubomír. „Vřeteník a naklápěcí hlava frézovacího multifunkčního obráběcího centra s vodorovnou osou vřetena“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402637.
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The thesis contains of draft, calculations, CAD model and drawing documentation of the moltifunctional machining center with horizontal axis of spindle. This thesis is one of the four parts with which connection ensue the machine-tool. In the first part of my work, there is a constructional draft of the headstock which will enable milling, turning and drilling. In the introduction of this part is headstock research which is solving the most important parts of the headstock of machine . Consequently, technical calculations are acoomplished. Based on these calculations, a specific constructional draft of the headstock is crafted. In the next part of my work, I do research in the area of removable paring milling heads. After this part, there are technical calculations and the specific constructional draft. In the entire work, there is emphasis put on simplicity and functionality.
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Pavlíček, Alois. „Konstrukce horizontálního frézovacího a vyvrtávacího stroje“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231385.
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This master thesis deals with the engineering design of a headstock floor type boring/milling machine. At first, background research of boring machines and accessories is performed. The type and parameters of the floor type boring machine are chosen according to the background research. In the next part the thesis deals with the individual structural units of the headstock. The thesis also contains a 3D model of the headstock and fine drawing documentation. The 3D model of the horizontal floor type boring machine has been converted into a virtual reality environment.
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Lin, You Chen, und 林宥辰. „Thermal Characteristic Measurement and Thermal Management Analysis of a Horizontal Type Machine Tool“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xkdpur.
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碩士國立勤益科技大學
冷凍空調系
105
With the of machine tool industry, machine tools will be developed toward high-speed, high precision machining and multi-tasking. On the other hand, machine tool coolers are the best strategy for thermal management in avoiding the thermal deformation for machine tools. However, due to energy efficient component s were raised in recent year, it’s a commonly-seen problem for improper selection for machine tool cooler only based on previous sizing experience. In this study, the temperature variation of built-in motor spindle through experimental method was examined and analyzes extensively during actual machining process under different ambient temperature for one year. After analyzing the field testing data, computer simulation for the cooling system of spindle has been conducted extensively to identify the better thermal management strategies. Besides, predictive model using regression analysis has been implemented comprehensively to analyze thermal behavior of spindle. The experimental results reveal that the machining loading is about 50-60% of rated loading and there is a strong relation between temperature variation of spindle and ambient temperature. The developed predictive model provides a reliable estimation for temperature deviation of spindle under different ambient temperature. It is a valuable information for selecting suitable machine tool cooler under different ambient temperature according to the experimental temperature data of spindle in each season.
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Chen, Chih-Yen, und 陳治諺. „Analysis and Improvement Design of Thermal Deformation for a Four-Axis Horizontal Machine-Tool“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/auk22g.
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碩士國立虎尾科技大學
機械與電腦輔助工程系碩士班
100
Thermal deformation of the structure due to temperature rise in high-speed cutting process becomes a challenge that should be overcome at present for machine tools. In recent years, the technology of a real-time online thermal compensation system has been largely progressed. Although the positioning accuracy of a feed-drive system has been increased, but it still can not solve the issue of nonlinear thermal deformation of the structure. This project focuses on the study of thermal deformation within headstock, ball-screw and bearing in a four-axis horizontal machine-tool caused by heat source generation during high-speed operation. It tries to perform structure design of heat symmetry, heat isolation and cooling suppression. The goal is to achieve a heat balance structure, reduce the effect of thermal deformation on machining accuracy and promote the thermal stability of a machine tool structure. First of all, thermocouples and an infrared thermal imager were used to measure the temperature at some important locations of the spindle system and ball-screw after a long period of operation. The measured temperatures were used as the boundary conditions for numerical analysis. The heat transfer analysis was conducted for headstock, ball-screw and bearing by finite element method, and the temperature field and thermal deformation of these parts can thus be obtained. Then, heat isolation and cooling piping embedded design for headstock and bearing was conducted. The geometrical configuration and dimensions of this heat isolation structure and the setting location of the cooling pipes were modified constantly according to the analysis results from the repeated finite element simulation procedures. It is expected that the temperature distribution in a machine tool structure may reach equilibrium state and the impact of thermal deformation can be reduced. Additionally, a mechanical force was applied to this machine tool structure for numerical simulations of rigidity and strength. Finally, the numerical simulation analysis was performed to determine the deformation situation under the coupling action between both the mechanical and thermal loads. This analysis may reflect the machine tool structure under practical working conditions. The results show that the total displacement of headstock, ball-screw and bearing is mainly contributed from the thermal deformation. The structure design of heat symmetry and heat isolation can isolate the heat transfer effectively, and the accompanied cooling pipe system can remove the heat source quickly. The thermal deformation can thus be reduced. As a result, the stability and central positioning accuracy in each substructure can thus be maintained and the machine tool structure design fulfills the heat balance demand in industry.
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Yang, Kai-Chieh, und 楊凱傑. „Development of an intelligent horizontal micro machine tool with high-frequency vibration assisted machining and research of nano milling-grinding on Zerodur® glass ceramic“. Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4tzbnz.
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GÖkler, M. I., H. Eskicioglu und H. BastÜrk. „Computer Aided Part Programme Generation for Manufacture of Horizontal Upset Forging Dies“. In Proceedings of the Twenty-Sixth International Machine Tool Design and Research Conference, 73–78. London: Macmillan Education UK, 1986. http://dx.doi.org/10.1007/978-1-349-08114-1_10.
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2
Xu, Xun. „CNC Machine Tools“. In Integrating Advanced Computer-Aided Design, Manufacturing, and Numerical Control, 165–87. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-714-0.ch008.
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The introduction of CNC machines has radically changed the manufacturing industry. Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action has dramatically reduced. With the increased automation of manufacturing processes with CNC machining, considerable improvements in consistency and quality can be achieved. CNC automation reduced the frequency of errors and provided CNC operators with time to perform additional tasks. CNC automation also allows for more flexibility in the way parts are held in the manufacturing process and the time required to change the machine to produce different components. In a production environment, a series of CNC machines may be combined into one station, commonly called a “cell”, to progressively machine a part requiring several operations. CNC controller is the “brain” of a CNC machine, whereas the physical configuration of the machine tool is the “skeleton”. A thorough understanding of the physical configuration of a machine tool is always a priority for a CNC programmer as well as the CNC machine tool manufacturers. This chapter starts with a historical perspective of CNC machine tools. Two typical types of CNC machine tools (i.e. vertical and horizontal machining centres) are first discussed. Tooling systems for a CNC machine tool are integral part of a CNC system and are therefore elaborated. Also discussed are the four principal elements of a CNC machine tool. They are machine base, machine spindle, spindle drive, and slide drive. What letter should be assigned to a linear or rotary axis and what if a machine tool has two sets of linear axes? These questions are answered later in the chapter. In order for readers to better comprehend the axis and motion designations, a number of machine tool schematics are given.
Konferenzberichte zum Thema "Headstock of horizontal machine tool"
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Tian, Tian, Cao Yan, Jia Feng und Zhang Leiyan. „Simulation Analysis of Flow Field Based on Horizontal Electrolytic Machine Tool“. In Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/pntim-19.2019.28.
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2
Gai, Yuxian, Huiying Liu und Shen Dong. „Vibration Control System for a Sub-Micro Ultra-Precision Turning Machine“. In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21040.
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For a sub-micro ultra-precision turning machine using airsprings as vibration isolation elements, a 5 FOG mathematical model is established, activation f acted on the machine bed is as the input, the output are vertical displacement y1, oscillating φ1, ψ1 around the horizontal axle x and z of the machine bed, vertical displacement y2 of the main spindle box, and vertical displacement y3 of the slider. The equations for vibration system of 5 FOG are solved. The results indicate, when actuation force f ≠ 0, the outputs of all 5 FOG are increasing with the increasing of f. when activation f = 0, the outputs of all 5 FOG tend to zero. Assuming f include the vibration of machine base and an external force, when external force is equal to that of the vibration of machine base, then f = 0. The vibration of 5 FOG can be effectively isolated, so electromagnetic actuators as an external force, also as active vibration isolation elements can be used in the isolation system. Three electro-magnetic actuators arranging as triangle act as an external force, the quantity is equal to that of the base vibration, and the phase reverse. In fact ultra-precision turning machine is a complicated mechanism system and in the machining process, the headstock and horizontal-slider are in the movement, that is to say, the center of mass of the ultra-precision machine is changeable. Impossible is f = 0 for a practical control. In order to get a effective vibration isolation, fuzzy controller is used. The synthetic experiments have been done for the 5 FOG vibration system of the ultra-precision turning machine. The result of three actuations experiment that has been done in y direction indicates that the vibration of y direction, and oscillating φ1, ψ2 around the horizontal axle x and z of the machine bed are to be controlled. A work-piece of aluminum alloy has been machined using the sub-micro ultra-precision turning machine with the active vibration isolation elements, and without the active vibration isolation elements, AFM microscope graphs show the surface roughness of the work-piece machined by the former better as by the latter.
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Mourtzis, Dimitris. „Machine Tool 4.0 in the Era of Digital Manufacturing“. In The 32nd European Modeling & Simulation Symposium. CAL-TEK srl, 2020. http://dx.doi.org/10.46354/i3m.2020.emss.060.
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Under the Industry 4.0 framework, a plethora of digital technologies and techniques has been introduced in the Manufacturing domain. Machine tools must become more intelligent, in order to create a network of fully connected machines. By extension, this will lead to the creation of the Industrial Internet of Things (IIoT). Although these technologies provide for increased functionality of the manufacturing equipment, there are certain issues/implications, refraining engineers from integrating such technologies in the production. Therefore, in this paper, the results of a systematic literature review are presented and discussed, including the horizontal and vertical integration of such digital technologies. The contribution of this paper extends to the recognition of the opportunities emerging as well as the identified implications from a practical implementation point of view.
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Dong, Huimin, Yang Tan, Delun Wang und Yali Ma. „Dynamic Characteristics of a Machine Tool at Working Positions in Operating Test“. In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48899.
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A machine tool is an assembly structure fitted by some moveable substructures, which the relative motion between the substructures creates normal and limit operating positions. Along with the substructures moving, the distributions of masses, stiffness and damping of the machine in space vary, leading to variety of structure distributions and dynamic properties. For exploring the dynamic properties distributions of machine tools, this paper presents a testing method under practical operational excitations, which is under operating excitations from remaining unbalanced value in the spindle, and collecting vibration signals of time and frequency at the spindle foreside at working positions. To identify resonance characteristics, a judging matrix is established by comparing vibration energy and vibration amplitude at 1st octave. By this method, MDH50 active pole horizontal machining center is tested, and the dynamic characteristics is determined. It reveals that dynamic characteristics of resonance come from the substructure independent resonance and their superposition in operating excitation. For verifying this result, FEA is conducted, in which 20 nodes brick element and spring element are applied to build the model entities and interfaces. The analysis result by FEM is consistent to the testing results. The research provides foundation for how setting up machining programs to avoid the resonance vibration of the machine in the operating.
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Guo, Junkang, Jun Hong, Xiaopan Wu, Mengxi Wang und Yan Feng. „The Modeling and Prediction of Gravity Deformation in Precision Machine Tool Assembly“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63441.
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The variation propagation in mechanical assembly is an important topic in several research fields, such as computer aided tolerancing (CAT) and product quality control. Mathematical models and analysis methods have been developed to solve this practical problem. Tolerance analysis which is based on the rigid hypothesis can be used to simulate the mass manufacturing and assembly. The state space model and stream of variation theory are mainly applied in flexible part assembly. However, in precision machine tool assembly, both tolerance design and process planning critically impact the accuracy performance, mainly because of the fact that the gravity deformation, including the part deformation and the variation in the joint of two connecting parts, cannot be ignored in variation propagation analysis. In this paper, based on the new generation GPS (Geometrical Product Specification and Verification) standards, the verification and modeling of key characteristics variation due to gravity deformation of single part and adjacent parts are discussed. The accurate evaluation of position and orientation variation taking into account form errors and gravity deformation can be solved from this model by FEM. A mathematical model considering rail error, stiffness of bearings is introduced to simulate the motion error in gravity effect. Based on this work to more accurately calculate the variation propagation considering gravity impact, a state space model describing the assembly process of machine tools is proposed. Then, in any assembly process, the final accuracy can be predicted to find out whether the accuracy is out of design requirement. The validity of this method is verified by a simulation of the assembly of a precision horizontal machining center.
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Gessner, Andrzej, und Roman Staniek. „Optimizing Machining of Machine Tool Casting Bodies by Means of Optical Scanning“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62841.
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The hereby presented study reports on the results of research funded by the NCBiR improvement grant. The goal of the undertaken experimental effort was to eliminate the laborious process of marking out from the technological procedure of cast machining. Marking out, even in highly automatized machining enterprises, is performed manually. It assesses casting accuracy, as well as denotes surpluses on machining surfaces. The precision of marking out is, therefore, dependent on individual performance of a given worker. Moreover, gauging casts of cylindrical (non-perpendicular) shape is highly problematic. Incorrect marking out generates quantifiable material (cast iron) and machining losses, as well as production interruptions. Herein, we present an innovative cast machining technology based on cast model scanning. Prior to machining, each body is scanned according to the technology guidelines. The subsequent comparison of the cast model and the model of the machined body affords geometrical accuracy assessment of the cast and the determination of optimal machining surpluses. The surplus verifying criteria include: machining volume minimization, tool working motions minimization, and idle tool motion minimization. Moreover, in special cases, high productive cutting (HPC) or high speed machining (HSM) optimization of cast technology, as well as elimination of superfluous procedures (e.g. milling of machining datum surfaces), are possible. The proposed comparative analysis of the aforementioned 3D models additionally affords acquisition of data for positioning (horizontal alignment) of the machined cast, e.g. the required length of technological supports. The hereby presented experimental results (obtained in an industrial setting) confirm the proposed elimination of the marking out process, thereby affording time reduction of preparatory procedures, initial assessment, and positioning of the cast for machining, as well as a decrease of machining volume by approx. 10 % (for the investigated casts). Experimental simulation results allowed us to estimate the machining volume minimization reaching up to 25 % (depending on the cast shape and the machining process specifications). Moreover, our investigation indicated a possibility of detection of casting flaws caused by insufficient surface brushing down. As the casts are painted post-brushing, the interfering sand mold remains are easily overlooked and often cause cutting-tool damage leading to costly production interruptions.
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Smoli´k, Jan, Viktor Kuli´sˇek und Miroslav Janota. „Application of Sandwich-Based Designs on Main Structural Parts of Machine Tools“. In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50155.
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New, higher and challenging properties of new high-speed machines and high-performance machines bring up many questions connected to the design and properties of the main machine tool structures. Parameters like static stiffness, eigenfrequencies, modal damping and mass of parts may be identified as very important, and all these properties need to be improved. The most important material properties in the field of machine tools are presented in this paper. A case study based on a modification of a real horizontal machining centre is introduced. The modification consists in using a sandwich design concept in the main structural machine tool part. The sandwich concept, widely known and used in the aerospace industry and, more generally, the transportation industry, is not commonly used in machine tool design. A significant reduction of mass has been achieved by manufacturing a hybrid column with aluminum foam cores, while static stiffness has not been affected.
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Yi, Xianzhong. „Tool Path Planning Algorithm of Normal Curvature Approach Milling Model for Freeform Surfaces“. In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/cie-21297.
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Abstract The normal curvature approach model is a new milling method of machining complex freeform surfaces presented in this paper based on 5-axis CNC machines. For this milling model, its key is to optimize the CL-data of whirlwind milling tool so that the symmetric rotational surface, which is generated while the whirlwind milling tool rotates, can closely approach to the surface being machined. Then, this method evidently raises the material removal rate at the point of contact and efficiently improves the machining productivity. In the paper, a new-typed whirlwind milling tool with standard-sized circular cutters is introduced, and a special 5-axis CNC horizontal bed-typed milling machine is used in manufacturing the freeform surfaces. The tool path generation algorithm about normal curvature approach milling method and its typical examples are analyzed in detail.
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Hsu, Fu-Chuan, Cheng-Chang Chiu, Yu-Ting Lyu, Wen-Long Chang, Junz J. J. Wang, Yung-Yuan Liao und Steven Y. Liang. „Application of an Accuracy Enhancement Module for Precision Machine Tools by Spatial Error Compensation“. In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72177.
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A PC-based precision promotion module named “Precimatics” is presented in this study, which uses a spatial error compensation algorithm to modify the G/M code of coordinates of a CNC machine tool. The spatial errors of three axes machine tools were measured by two kinds of laser interferometers (Renishaw Inc. & Optodyne Inc.) According to the American standard (ASME B 5.54) and the laser vector method with sequential step diagonal path (LDDM™), the spatial errors of machine tools, such as linear position error, horizontal straightness error, vertical straightness error, and squareness error, were obtained without time consuming. A spatial error map of machine tools was created and embedded into the “Precimatics” for error compensation. The compensated results were simulated and verified by the coordinates of numerical control (NC) code. Integrating a CAD/CAM system with the “Precimatics”, the position accuracy of micro/meso machine tools (mMTs) can be improved by spatial error compensation without changing the configuration of CNC controller.
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Liang, Lin, Ting Lei und Matthew Blyth. „AUTOMATIC LOGGING-WHILE-DRILLING DIPOLE SONIC SHEAR PROCESSING ENABLED BY PHYSICS-DRIVEN MACHINE LEARNING“. In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0059.
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Logging-while-drilling (LWD) dipole sonic tools have been introduced to the industry as a supplement to monopole and quadrupole measurement because they can provide shear slowness anisotropy, which is essential for formation characterization and well completion applications. Due to the presence of the collar, which acts as a strong waveguide, the recorded formation signal is significantly affected at low frequencies. Consequently, an automated interpretation of LWD dipole sonic data re-mains a challenge. The traditional dispersive semblance-based method requires accurate estimates of parameters such as borehole size and/or mud slowness to avoid bias in the dispersion model used in the processing. Recently, a frequency-slowness domain inversion scheme has been developed that can invert for both the formation shear slowness and mud slowness by minimizing the guidance-mismatch cost function. However, this method uses an isotropic dispersion model and requires selecting narrow-band dispersion data in the low-frequency range with good-quality, which can limit the range of applicability of the method and also requires user input through-out the process. We have previously developed a physics-driven machine learning-based method to enhance the interpretation of wireline dipole sonic data. However, the LWD scenario introduces additional complexity. This work extends the method to support the interpretation of LWD dipole sonic. An anisotropic root-finding mode-search algorithm is first used to generate extensive synthetic formation flexural dispersion curves that can match dispersion measurements in strong anisotropic formations in high-angle and horizontal wells, with a known tool model. Special care needs to be taken to pick the formation flexural mode from several co-existing modes arising from the strong coupling between tool and formation. After quality control and verification, this comprehensive synthetic dataset is used to train a neural network model. We then develop an inversion-based algorithm, taking advantage of this efficient neural network model and combining it with a clustering algorithm, to reliably label and ex-tract the formation flexural mode, processed from either the modified Prony’s method, or a broadband dispersion analysis algorithm. The extraction around the formation flexural kick-in frequency is used for developing a quality control method. The strongest collar arrival, on the other hand, can be confidently removed due to the fundamental difference in its dispersion characteristics from the formation flexural mode. This novel method can automatically and efficiently label the formation flexural mode and simultaneously invert it for formation shear slowness together with other relevant parameters such as mud slowness without user intervention. Since this method is built upon an anisotropic model, it can be applied to the full frequency range of the data spectrum without the traditional isotropic model assumption. Additionally, the regression analysis of the inverted mud slownesses can further provide physical constraint to reduce uncertainties in the inverted shear slowness. The algorithm has been tested on field data showing good performance. It makes edge deployment possible so that LWD telemetry can be optimized to transmit the processed data to the surface in real-time, which is essential to leverage the advantages of the conveyance method.