Development of A Workpiece Straightness Error Compensation System for NC Turning

Author(s):  
Y. S. Liao ◽  
K. C. Fan ◽  
J. J. Huang ◽  
T. S. Chang

2012 ◽  
Vol 630 ◽  
pp. 389-395
Author(s):  
Rui Fan ◽  
Di Zhang

Influence and Compensation Theory of Installation Errors in Guideway Straightness Measurement with PSD Is Analyzed. it Shows that Pincushion Distortion Affects PSD’s Accuracy, while Angle θ between Laser and Guideway, Error Angle Caused by Straightness Error and Angle β Generated when PSD Rotates about the Guideway Have Significant Influence on System Measurement Accuracy. PSD’s Pincushion Distortion Could Be Corrected and Installation State Can Be Determined by Measuring on Site and Calibrating with Laser Tracer. after Error Compensation, System Measurement Accuracy Is Greatly Improved.



Author(s):  
Yi Zhang ◽  
Jianguo Yang ◽  
Sitong Xiang ◽  
Huixiao Xiao

This article intends to provide an error compensation system for five-axis machine tools. A volumetric error model is established with homogeneous transformation matrix method, from which compensation values of both orientation and position errors can be obtained. Thirty-seven errors on a five-axis machine tool are classified into three categories – functional, random, and negligible errors, among which the effect of the first one on volumetric accuracy is considered as great enough to be included in this model. Some typical modeling methods are discussed on positioning and straightness errors, considering both geometric and thermal effects. Then, we propose a compensation implementation technique based on the function of external machine zero point shift and Ethernet data communication protocol for machine tools. Finally, laser diagonal measurements have been conducted to validate the effectiveness of the proposed volumetric error compensation system.





2012 ◽  
Vol 482-484 ◽  
pp. 2076-2080
Author(s):  
Jian Liang Guo ◽  
Zhe Heng Zhang ◽  
Lian Qing Chen ◽  
Jun Chi ◽  
Xun Yang

Due to existence of relative motion between the grinding machine body and working table, the manufacturing error of guide track would result in a considerable grinding error inevitably. Thus the guide direction error becomes the most important static error source for longitudinal cylindrical grinding. In this paper, an error compensation system based on industrial computer was developed and used to counteract the guide direction error. In order to verify the performance of the proposed system, several grinding experiments were carried out. The experimental results show that the grinding error due to guide track error reduces by about 33% using the error compensation system.











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