Speed control method of cam tangential point tracking grinding

Abstract

The invention relates to a speed control method of cam tangential point tracking grinding. The method is used for locally correcting the speed change movement of a head frame in the cam tangential point tracking grinding; a triangle function approximation method is used for replacing a curve representing the excessive change of the rotating speed of the head frame; a polynomial parameter is rationally rotated according to the maximum of the cam lift change; and a polynomial is used for interpolating and defining the rotating speed curve of the head frame. The method solves the problem of excessive rotating acceleration of the head frame in the constant line speed grinding; the rotating speed of the head frame in the excessive acceleration section is only modified; and the integer is substantially kept in the head frame speed change revolving control model based on the constant grinding point line speed; the polynomial parameter calculated by interpolating and defining the rotating speed of the head frame through the polynomial, synthetically considering the parameter obtaining accuracy and the calculating convenience and selecting the proper parameter range PL and the coefficient matrix is more rational, thus the defect of vibration corrugations on the surface of the head frame is made up; the rotating speed of the head frame is increased; and the processing efficiency is improved.

Description

technical field The invention relates to a speed control method for cam tangent point tracking grinding. Background technique The tangent point tracking grinding method is a process-centralized grinding method. Its working principle is to control the rotation motion of the workpiece (C axis) and the lateral feed motion (X axis) of the grinding wheel, so that the outer circle of the grinding wheel The contour of the machined surface is always tangential, thus enabling the machining of the workpiece surface. The cam tangent point tracking model is shown in Figure 1. The tangent point tracking grinding method motion model consists of two parts: the variable speed rotation of the head frame (cam) and the reciprocating tracking motion of the grinding wheel frame. The variable-speed rotary control of the headstock based on the constant linear velocity of the grinding point is to pursue a constant grinding rate and improve the grinding accuracy. However, when grinding at a constan...

AI Technical Summary

Problems solved by technology

This method modifies the rotation speed of the headstock when the acceleration is too large, and still basically follows the control law of the headstock variable speed rotation at the grinding point with a constant linear velocity, which solves the problem of excessive headstock rotation acceleration and headstock rotation during constant linear velocity grinding. The rotation axis of the frame cannot accurately track the input curve, which affects the accuracy of the cam surface; the rotation speed of the head frame is defined by polynomial interpolation, and the accuracy of the parameters and the simplicity of the calculation are comprehensively considered, and the appropriate parameter range PL and coefficient matrix are selected. , calculate the reasonable headstock speed polynomial coefficient, and use the polynomial coefficient in the programming of NC machining program to realize the speed control of the headstock