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

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.

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

Compensation System for Thermal Deformations of Ballscrews

2014 ◽  
Author(s):  
Michał Kowal ◽  
Roman Staniek
Keyword(s):  
Thermal Expansion ◽  
Machine Tools ◽  
Kinematic Chain ◽  
Indirect Measurement ◽  
Cnc Machine Tools ◽  
Positioning Error ◽  
Cnc Machine ◽  
Measurement Systems ◽  
Drive Systems ◽  
Precise Machine

Accurate ballscrews are vital components of precise machine tool drive systems. As determined by direct measurement systems, the ballscrew positioning error has no bearing on the final positioning accuracy of the axis. For economical reasons, however, most machine tools are equipped with indirect measurement systems, in which errors stemming from thermal expansion of the ballscrew constitute approximately 60% of the kinematic chain error sum. Moreover, the currently observed boost in productivity of modern CNC machine tools leads to significant amplification of energy dispersal values in the nut-screw systems, due to the increased positioning velocity of the controlled axes. This, in turn, contributes to a rise of positioning error values through thermal expansion of the aforementioned ballscrews. This article deals with technological and constructional problems of screw lengthening compensation. It enumerates methods of thermal expansion-based error compensation as attained through utilization of indirect measurement systems. Finally, it presents experimental data indicating the possibility of effective screw lengthening compensation, thus proposing an alternative to the currently applied compensation systems.

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.

Analysis and Simulation of Screw Joint in CNC Machine Tool

2011 ◽  
Vol 141 ◽  
pp. 203-207
Author(s):  
Ya Wei Zhang ◽  
Wei Min Zhang
Keyword(s):  
Machine Tool ◽  
Fem Simulation ◽  
Cnc Machine Tools ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Feed Drive ◽  
Screw Joint ◽  
Drive Systems ◽  
Multi Body ◽  
Feed Drive System

CNC machine tools has always screw joints in its feed drive systems; In order to obtain good performance of CNC machine tool, it is necessary to model the screw joint with more accuracy and to research its influence on the vibration characters of the feed drive system. In this paper, the screw joint is analyzed by multi-body system theory and is modeled as flexible multi-body; Its mathematical describe of constraint condition is given by the modeling of screw joint. A revise factor is introduced into the process of FEM simulation to reflect the deformation in the screw joint. By this way, the effect of deformation in the screw joint is researched in the modeling under the ANSYS circumstance, the harmonic response under considering deformation contrast to that of without deformation. From the analysis in the simulation, it is necessary to take the deformation of screw joint into account.

Model of a CNC Feed Drive for On-Site Tuning of the Controllers for Single Axis Motion

2016 ◽  
Vol 841 ◽  
pp. 133-138
Author(s):  
Radu Eugen Breaz ◽  
Sever Gabriel Racz ◽  
Octavian Bologa ◽  
Melania Tera
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Cnc Machine Tools ◽  
Simulation Tool ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Feed Drive ◽  
Feed Drives ◽  
Contouring Accuracy ◽  
High Degree

The accuracy of CNC machine-tools is heavily influenced by the correct tuning of the feed drives controllers. While an initial tuning is performed by the machine-tool manufactures, in time the values have to be changed by the user in order to preserve positioning and contouring accuracy of the machine. This paper presents a model of a CNC feed drive, for a particular CNC machine-tool, but with a high degree of generality. The objective is to provide the user the necessary knowledge, together with a simple, yet accurate simulation tool, in order to assist him in the process of tuning the controllers.

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