Ultra-precision lathe motion control method based on fuzzy PID self-tuning calculation

Abstract

The invention discloses an ultra-precision lathe motion control method based on fuzzy PID self-tuning calculation, and relates to the technical field of ultra-precision cutting processing. The methodmainly comprises the following steps: acquiring preset position information and actual position information of a linear motion guide rail of a lathe as a controlled object; and calculating a control output quantity by adopting a fuzzy PID control algorithm according to the deviation value between the preset position and the actual position and the change rate of the deviation value, and inputtingthe control output quantity into a control system to control the linear motion guide rail to move. A discourse domain parameter self-tuning method is adopted in fuzzy PID control and introduced into the fuzzy PID control, autonomous learning can be achieved, the static and dynamic performance of the ultra-precision lathe guide rail control system is improved, and then the purpose of improving theultra-precision cutting machining precision is achieved.

Description

technical field [0001] The invention relates to the technical field of ultra-precision cutting and processing, and more to the technical field of high-precision control of moving parts. Specifically, it relates to a motion control method for an ultra-precision lathe based on fuzzy PID self-tuning calculation. Background technique [0002] Ultra-precision diamond turning (single point diamond turing, SPDT) is an important equipment in ultra-precision machining. It is often used to process optical components with complex surface shapes or special surface shape requirements, such as gyroscopes for defense cutting-edge products, high-precision flat mirrors / lenses , precision instruments and various components in high-power laser systems. Since the surface topography of such parts is directly related to the relative motion between the tool and the workpiece, the high surface accuracy and high surface quality of such parts require the servo control system of the ultra-precision di...

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Problems solved by technology

[0003] At present, the mainstream control algorithm applied to the guide rail of ultra-precision diamond lathe is based on the PID control algorithm of motion controllers such as UMAC. However, there are time-varying factors such as nonlinearity in ultra-precision machining, which makes it difficult for traditional PID control to adapt to changes in motion position and load disturbance. Parameter perturbation and creep caused by nonlinear factors such as external disturbances, etc. In view of this situation, fuzzy PID control is adopted in the prior art, that is, fuzzy control is introduced into the PID parameter adjustment to provide the adaptiveness of the control system , and the lack of self-tuning in the fuzzy PID control, the control effect is limited, and the precision of ultra-precision cutting is always not high enough

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