STUDY ON FRICTION ERROR OF HIGH-SPEED
HIGH-PRECISION NC SERVO TABLE
Mei Xuesong
Tao Tao
(Xi'an
Jiaotong University)
Masaomi
Tsutsumi
(Tokyo
University of Agriculture and Technology)
Sun
Nuogang
(Tokyo
University of Agriculture and Technology)
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Abstract:
With
consideration of friction influence, a mathematics model is established
for a high-speed high-precision feed servo table under PID control. A
two-component mixed friction model is used to express the friction force
in servo mechanisms. The friction can be calculated according to the
sliding speed, the oil film between the two contact surfaces by using
the model. Under various work conditions, the protrusion error occurring
at the quadrant boundary in the circular motion is profoundly studied
through numerical simulation and experiments and the phenomena that the
quadrant protrusion error lags with the rising of the federate is
discovered. Comparisons between simulation results and experimental
results demonstrate that with the mathematics model considering the
friction effects proposed, the dynamics of high-speed high-precision
servo feed systems under PID control can be accurately simulated, the
friction error and its characteristics in the course of the feeding can
be precisely predicted.
Key words:
Friction
error Numerical control High-precision
CLC No: TP273
陕西省自然科学基金资助项目. Received 20000202,
received in revised form 20001028
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