Influence Analysis of Geometric Errors to Volumetric Machining Accuracy of a 5-Axis CNC Machine Tool

2013 ◽  
Vol 420 ◽  
pp. 85-91 ◽  
Author(s):  
Li Gang Cai ◽  
Qiu Nan Feng ◽  
Qiang Cheng ◽  
Pei Hua Gu ◽  
Cui Zhang
Keyword(s):  
Machine Tool ◽  
Geometric Error ◽  
Cnc Machining ◽  
Machining Accuracy ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Spatial Error ◽  
Matrix Differential ◽  
Multi Body ◽  
Five Axis

The precision model of the 5-axis CNC machine tool can be built up based on the theory of kinematics for multi-body system (MBS). And then based on the precision model, the sensitivity analysis established with matrix differential is a method of identifying geometric error parameters for machine tool. And the geometric error factors of major parts that have relatively significant influence on comprehensive spatial error of the machine tool are identified. Finally, important theoretical basis for improving the titanium alloy Five-axis CNC machining center reasonably and for the error compensation can be provided.

Sensitivity Analysis of Geometric Errors for Five-Axis CNC Machine Tool Based on Multi-Body System Theory

2012 ◽  
Vol 271-272 ◽  
pp. 493-497
Author(s):  
Wei Qing Wang ◽  
Huan Qin Wu
Keyword(s):  
System Theory ◽  
Sensitivity Analysis ◽  
Machine Tool ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Body System ◽  
Cnc Machine ◽  
Multi Body ◽  
Five Axis

Abstract: In order to determine that the effect of geometric error to the machining accuracy is an important premise for the error compensation, a sensitivity analysis method of geometric error is presented based on multi-body system theory in this paper. An accuracy model of five-axis machine tool is established based on multi-body system theory, and with 37 geometric errors obtained through experimental verification, key error sources affecting the machining accuracy are finally identified by sensitivity analysis. The analysis result shows that the presented method can identify the important geometric errors having large influence on volumetric error of machine tool and is of help to improve the accuracy of machine tool economically.

Influence Analysis of Machine Tool’s Turntable Angle Errors to the Roundness of Machined Hole

2014 ◽  
Vol 496-500 ◽  
pp. 816-822
Author(s):  
Qiang Cheng ◽  
Hong Wei Zhao ◽  
Li Gang Cai ◽  
Pei Hua Gu
Keyword(s):  
Machine Tool ◽  
Geometric Error ◽  
Cnc Machine Tools ◽  
Machining Accuracy ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Roundness Error ◽  
Machine Errors ◽  
Multi Body ◽  
The Mathematical Model

Machining accuracy has always been a key problem to machine tool. Machine errors are caused by a variety of error factors among which the geometric error is a key element. An accuracy model of the 3-axis CNC machine tool is established in this paper with multi-body system (MBS).And based on the accuracy model, the mathematical model of roundness error also built up. At last, the influence of CNC machine tools turntable angle error to roundness error of machined hole is analyzed.

Study on Dynamics Simulation of Rigid-Flexible Coupling for CNC Machine Tool

2011 ◽  
Vol 130-134 ◽  
pp. 2705-2708
Author(s):  
Wei Ping Luo ◽  
Man Hua Chen ◽  
Jun Wang
Keyword(s):  
Machine Tool ◽  
Dynamic Analysis ◽  
Weak Link ◽  
Turbine Rotor ◽  
Dynamics Simulation ◽  
Prototype Model ◽  
Machining Accuracy ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Five Axis

A virtual prototype model of five-axis CNC machine tool has been constructed. Through the ADAMS software, the process of the machine is simulated and the dynamic analysis is carried out. The experimental model analysis on the column of the machine is practised with the software ADAMS, the weak link of the column is found out and a modification scheme is put forward for the design of the column structure. Improvement of structure of the column can effectively raise the working accuracy .Currently, five-axis CNC machine tool is the only way to solve parts processing such as impeller, special propeller, turbine rotor , large diesel engine crankshaft ,etc. Therefore, it is very important to carry out the dynamic analysis of the five axis CNC machine. In this paper, a rigid-flexible multi-body dynamics model for a five-axis CNC machine tool is set up, in which the column parts are modeled by flexible bodies. Aimed at the improvement of the machining accuracy, the effect of different structures of column are analyzed.

Geometric Error Identification and Compensation for Rotation Axes of Five-Axis Machine Tools

2011 ◽  
Vol 338 ◽  
pp. 786-791 ◽  
Author(s):  
Wang Wei Chu ◽  
Shao Wei Zhu ◽  
Yu Peng ◽  
Guo Fu Ding
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Error Identification ◽  
Rotation Axes ◽  
Process System ◽  
Prototype Software ◽  
Multi Body ◽  
Five Axis

In NC machining, the precision of the final parts is affected by many factors, including geometric deviation of machine tool components and structures, deformation of process system caused by cutting force and cutting heat, servo delay, tool wear and so on. Among which geometric error of machine tool is one of the most important factors. This study focused on geometric error identification and compensation of rotation axes of five-axis machine tools. A new method was proposed to identify the 6 geometric error parameters of each rotation axes of five-axis machine tools based on a ball-bar system. Regarding the machine tool as a rigid multi-body system (MBS), a geometric error model was established based on homogeneous transfer matrix (HTM). Finally, the geometric errors were compensated by correcting NC codes by the prototype software system developed in this study. An experiment and an application were conducted and the results show that the proposed method is effective to improve the machining accuracy.

Finite Element Static Stiffness Analysis of the A/C Axes Bi-Rotary Milling Head

2013 ◽  
Vol 655-657 ◽  
pp. 1195-1199 ◽  
Author(s):  
Bo Shi ◽  
Mei Fa Huang ◽  
Yong Chen ◽  
Ru Kai Hu ◽  
Wu Jun Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Working Conditions ◽  
Structure Design ◽  
Machining Accuracy ◽  
Cnc Machine Tool ◽  
Static Stiffness ◽  
Cnc Machine ◽  
Stiffness Analysis ◽  
Five Axis

A/C axes bi-rotary milling head is an important functional component in gantry type five-axis CNC machine tool. The static characteristics affect directly the machining accuracy of machine tool. The paper investigates the static stiffness of A/C axes bi-rotary milling head in gantry type five-axis CNC machine tool XK2320-5X developed by a domestic company. Because this product developed depend on the experience of designers, the machining accuracy of A/C axes bi-rotary milling head of primitive XK2320-5X type cannot meet the accuracy requirement under actual working conditions. On the basis of structure design, the static stiffness analysis of the milling head under two working conditions is carried out using finite element method. The deformations of the main mechanical parts in the milling head are obtained. The analysis results indicate that the static stiffness in direction X is the weakest of the milling head and the milling head shell is the most important factor of deformation. The work done provides foundation for further structure design and machining accuracy improvement of A/C axes bi-rotary milling head.

Kinematic Reliability Analysis of Five-Axis Machine Tool

2011 ◽  
Vol 308-310 ◽  
pp. 1292-1296 ◽  
Author(s):  
Qiang Yang ◽  
Zhi Li Sun ◽  
Yan Yan Shi ◽  
Dan Dan Jia ◽  
Yu Tao Yan
Keyword(s):  
Machine Tool ◽  
Reliability Analysis ◽  
Error Component ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Math Model ◽  
The Monte Carlo Method ◽  
Multi Body ◽  
Five Axis ◽  
Input Error

Five-axis CNC machine tool is the top product of numerically controlled machine tool. Kinmatic accuracy is an important index to evaluate the quality of mechanism. Kinematic accuracy analysis of the Five-axis machine tool in previous study ignores the randomness of each input error component, so the conclusions are imprecise. Using the homogeneous transformation, inverse kinematics of VMC650 Five-axis machine tool is calculated. Based on Multi-body System Theory, error model of the machine tool is presented. Considering the randomness of every input error components, applying the Monte Carlo method, math model of kinematic reliability of the mechanism is deduced. The calculation method of kinematics reliability are put forward applying point evaluation and track evaluation. Kinematic reliability analysis provides some theoretical reference for improving the machining accuracy and operation life of machine tool.

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