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Improvement of Corner Contouring Accuracy of CNC Servo Systems with Communication Delay  

Lim, Jong-Hyup (Department of Mechanical Engineering, Dankook Univ.)
Jee, Sung-Chul (Department of Mechanical Engineering, Dankook Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.28, no.2, 2011 , pp. 168-175 More about this Journal
Abstract
Contouring accuracy of CNC machine tools is very important for high-speed and high-precision machining. In particular, large contour error may occur during corner tracking. In order to reduce the corner contouring error, acceleration and deceleration control or tool-path planning methods have been suggested. However, they do not directly control the corner contouring error. In the meantime, network servo systems are widely used because of their easiness of building and cost effectiveness. Communication latency between the master controller and servo drives, however, may deteriorate contouring accuracy especially during corner tracking. This paper proposes a control strategy that can accurately calculate and directly control the corner contouring error. A prediction control is combined with the above control to cope with communication latency. The proposed control method is evaluated through computer simulation and experiments. The results show its validity and usefulness.
Keywords
Multi-Axis CNC; Servo Drive; Contouring Error; Corner Contouring Error;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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