scholarly journals Mathematical Model of Feed Drive Mechanical System and Friction for CNC Machine Tools.

1995 ◽  
Vol 61 (10) ◽  
pp. 1458-1462 ◽  
Author(s):  
Masaomi TSUTSUMI ◽  
Seiji OHTOMO ◽  
Yuichi OKAZAKI ◽  
Koji SAKAI ◽  
Kazuo YAMAZAKI ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mechanical System ◽  
Machine Tools ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Feed Drive

Establishment and Analysis of Mathematical Model of the Accuracy Identification of Five-Axis CNC Machine Tools

2014 ◽  
Vol 945-949 ◽  
pp. 1700-1706
Author(s):  
Rong Bo Shi ◽  
Zhi Ping Guo ◽  
Zhi Yong Song
Keyword(s):  
Mathematical Model ◽  
Machine Tools ◽  
Theoretical Research ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Feed System ◽  
Kinematics Model ◽  
Five Axis

This paper studies control and motion theory of feed system of the five-axis CNC machine tools, propose the method of establish mathematical model, kinematics model of the feed system, in order to provide a method of theoretical research for accuracy identification of five-axis CNC machine tools.

The Analysis and Optimization of Machining Precision Based on Electromechanical Matching in High-Speed Machine Tools

2016 ◽  
Vol 836-837 ◽  
pp. 584-591
Author(s):  
Xiao Jun Yang ◽  
Cheng Fang Ma ◽  
Yan Li ◽  
Dun Lv ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Mechanical System ◽  
Surface Quality ◽  
Machine Tools ◽  
High Speed ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Feed System ◽  
Servo Drive ◽  
Machining Precision

With the development of the high-speed and high-precision CNC machine tools, the interaction between mechanical system and servo drive torque in the feed system becomes more and more serious which affects the surface quality of the workpiece. In this paper, taking a small-sized vertical milling center as the research object, the characteristics of servo torque and mechanical system are analyzed, respectively. Then the influence of electromechanical matching on the tracking fluctuation of the feed system is discussed. Furthermore, aiming at the surface roughness of the workpiece, the influence of the interaction between servo torque and mechanical system on the surface quality of the workpiece is analyzed under different milling ways. Finally, a large number of experiments are carried out to verify the analysis above. At last, the optimization methods of machining precision based on electromechanical matching are put forward. It can be found that in the high-speed machining, the servo torque has lots of harmonics which act on the mechanical system with kinds of modals, leading to the vibration. The surface quality of the workpiece will be deteriorated rapidly when the mode of vibration is consistent with the sensitive direction of machining error. The surface quality of the workpiece can be significantly improved through optimizing the feed velocity and the processing method and realizing the electromechanical matching.

scholarly journals Multi-Axis Control using Model Matching Method of Feed Drive Systems for CNC Machine Tools.

1999 ◽  
Vol 65 (5) ◽  
pp. 704-708 ◽  
Author(s):  
Takanori YAMAZAKI ◽  
Tomohiro KURIHARA ◽  
Masaomi TSUTSUMI
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Model Matching ◽  
Cnc Machine ◽  
Matching Method ◽  
Feed Drive ◽  
Drive Systems

Fuzzy-Comprehensive Evaluation of Use Reliability of CNC Machine Tools

2011 ◽  
Vol 464 ◽  
pp. 374-378 ◽  
Author(s):  
Zhao Jun Yang ◽  
Xiao Cui Zhu ◽  
Ya Zhou Jia ◽  
Li Ding Wang ◽  
Bin Bin Xu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Machine Tools ◽  
Comprehensive Evaluation ◽  
Fuzzy Theory ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Evaluation Theory ◽  
Failure Data

This paper chose multi-index to provide a comprehensive evaluation model to evaluate the use reliability of CNC machine tools as a single assessment indicator is biased. As the number of evaluation factors is huge and it is difficult to get the exact values, a fuzzy theory is applied. Reliability mathematical model and maintainability mathematical model were established based on failure data selected from filed test and calculated the estimation values of reliability indexes. Subsequently, a fuzzy comprehensive evaluation mathematical model of CNC machine tools was constructed which combined fuzzy with comprehensive evaluation theory. Using this model could evaluate reliability level of CNC machine tools accurately and integrative.

Measurement and Analysis of Static Friction for Feed Drives of CNC Machine Tools

2010 ◽  
Vol 36 ◽  
pp. 86-95 ◽  
Author(s):  
Syh Shiuh Yeh ◽  
Jin Tsu Sun
Keyword(s):  
Machine Tools ◽  
Static Friction ◽  
Cnc Machine Tools ◽  
Fast Fourier Transformation ◽  
Physical Interaction ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Feed Drive ◽  
Feed Drives ◽  
Measurement And Analysis

Static friction generally exists in feed drive servomechanisms and usually affects the motions of CNC machine tools. In this study, the breakaway experiment is applied to measure the static friction of a feed drive servomechanism generally used in CNC machine tools, and the spectral analysis using the fast Fourier transformation algorithm is applied to analyze the frequency characteristics of the obtained static friction. Several experiments were carried out on a three-axis CNC milling machine so as to illustrate the feasibility of the developed measurement and analysis methods. The experimental results indicate that the static friction of a feed drive servomechanism is clearly position-dependent and the physical interaction of the mechanical parts in the transmission system used by the feed drive servomechanism significantly affects the characteristics of the static friction.

Identification of 5-Axis Machine Tools Feed Drive Systems for Contouring Simulation

2011 ◽  
Vol 5 (3) ◽  
pp. 377-386 ◽  
Author(s):  
Burak Sencer ◽  
◽  
Yusuf Altintas ◽  
Keyword(s):  
Transfer Function ◽  
Machine Tools ◽  
Closed Loop ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Feed Drive ◽  
Model Transfer ◽  
Drive Systems ◽  
Feed Drive System ◽  
Model Transfer Function

An identification technique is introduced for identifying closed loop transfer function of machine tool’s feed drive systems to be used in simulation of the tracking and contouring performance of Computer Numerical Controlled (CNC) machine tools. The identification is performed from air-cutting tests utilizing only standard G-codes containing linear motion commands. A general transfer function model is derived for representing the closed loop tracking response of the feed drive system. The model considers the drive to be controlled by commonly used controller schemes such as P-PI Cascade, PID or the Sliding Mode Controller (SMC) with feed-forward dynamic and friction compensation. The parameters of the model transfer function are fitted tominimize the discrepancy between the actual and predicted axis position on the axis. In order to guarantee the stability of the identified model transfer function, bounds on the pole locations are imposed. The resultant constrained non-linear optimization problem is solved efficiently using the Particle Swarm Optimization (PSO) method. For achieving reliable convergence of the stochastic PSO algorithm, a parameter tuning strategy is presented. Simulation and experimental studies show that the identified feed drive model captures the fundamental dynamics of the drives system accurately for simulating their closed loop response. Combined with the kinematics of the machine, contouring errors of 5-axis CNC machine tools during simultaneous multi-axis motion are predicted.

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