Title :
Compensation for the exponential type lost motion to improve the contouring accuracy of NC machine tools
Author :
Sugie, Hiroshi ; Iwasaki, Takashi ; Nakagawa, Hideo ; Kohda, Seido
Author_Institution :
IESL, Mitsubishi Electr. Corp., Itami, Japan
Abstract :
Lost motion is a major disturbance to the contouring accuracy of NC machine tools. Although NC machine tools with plain bearing guideways perform high alignment accuracy, they sometimes show exponential-type lost motion. Conventional step-type backlash compensation applied to that lost motion, causes contouring error due to overcompensation. This paper presents a model of a two-body system with a damper and a nonlinear spring that exhibits the exponential-type lost motion, and a compensation method for that lost motion introduced from the model. Experimental results show the improved performance of the proposed method
Keywords :
compensation; control system analysis; control system synthesis; damping; machine tools; machining; motion control; numerical control; process control; NC machine tools; alignment accuracy; backlash compensation; contouring accuracy; contouring error; control performance; exponential-type lost motion compensation; overcompensation; plain bearing guideways; AC motors; Computer numerical control; Damping; Feeds; Machining; Servomechanisms; Servomotors; Shock absorbers; Springs; Testing;
Conference_Titel :
Industrial Electronics Society, 1999. IECON '99 Proceedings. The 25th Annual Conference of the IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-5735-3
DOI :
10.1109/IECON.1999.819443
