Grinding wheel path generation method for slow-speed servo grinding of free-form surfaces

Abstract

The invention relates to a grinding wheel route generation method for low-speed servo grinding of a free-form surface. A plane perpendicular to the Z axis of a workpiece coordinate system is established at the position, a certain distance zd above a to-be-machined free-form surface, in the workpiece coordinate system; an isometric helical line is generated in the plane and is discretized, and points obtained after discretization are converted into a cylindrical coordinate system form (rho, theta, zd); the to-be-machined free-form surface is rotated around the Z axis by the angle theta; and theminimum distance delta, between the grinding wheel machining curved surface and the rotated to-be-machined free-form surface in the Z direction, at the position of each point on the isometric helicalline is calculated, and the coordinate of the grinding wheel control point is obtained to be (rho, 0, zd-theta). A grinding wheel is an annular grinding wheel. The axis of the grinding wheel is perpendicular to the axis of a workpiece rotation shaft. According to the method, the projection drive track of the grinding wheel control point is generated preferentially, and stability of the feeding movement, in the X direction, of the grinding wheel is ensured; and the machining efficiency is higher, and precision of machined surfaces is higher.

Description

technical field [0001] The invention belongs to the technical field of ultra-precision machining and complex part manufacturing, and relates to a grinding wheel path generation method based on slow-speed slide plate servo grinding of free-form surfaces. Background technique [0002] Since the 1980s, with the development of astronomy, communications, microelectronics, and aerospace and other fields, higher requirements have been placed on the performance, imaging quality and structure of optical systems. Traditional optical systems using spherical or aspherical surfaces are not only complex in structure and bulky, but also difficult to meet high standards of imaging quality and optical performance requirements. The use of optical free-form surfaces can provide optical designers with great design freedom. Using one or a few optical free-form surfaces can replace multiple spherical or aspherical components, which not only simplifies the structure of the optical system, but also...

AI Technical Summary

Problems solved by technology

However, for the circular aperture optical free-form surface with small diameter and obvious rotation characteristics, this processing method is not only time-consuming, but also the processing quality is deteriorated due to the discontinuous feeding of the tool, while the grinding method based on slow tool servo It can overcome these shortcomings and is very suitable for processing such optical free-form surfaces

However, the relevant research at home and abroad has not provided the relevant grinding wheel path calculation method, so it is necessary to develop a grinding wheel path generation method for slow tool servo grinding

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