Grinding wheel home position automation shaping and milling processing method of off-axis aspheric reflector

Abstract

The invention discloses a grinding wheel home position automation shaping and milling processing method of an off-axis aspheric reflector, and relates to the advanced manufacturing field of space optics systems. The grinding wheel home position automation shaping and milling processing method of the off-axis aspheric reflector solves the problem that an existing single point oblique axis grinding method is low in processing efficiency. The grinding wheel home position automation shaping and milling processing method of the off-axis aspheric reflector includes: establishing a computer aided design (CAD) analysis model of the off-axis aspheric reflector; calculating processing residence time and a processing path of a current grinding point on the surface of a cambered grinding wheel; calculating variable quantity of a current Z axis following coordinate of the cambered grinding wheel on the Z axis direction, which is caused by variation of the current grinding point on the surface of the cambered grinding wheel; producing a post processor file and converting the post processor file into a five axis linkage numerical control processing program; fixing a work piece at the center of a five axis linkage machine tool rotary table, and using ultrasonic vibration to assist the cambered grinding wheel in swing processing according to the five axis linkage numerical control processing program. The grinding wheel home position automation shaping and milling processing method of the off-axis aspheric reflector enables each point on the surface of the grinding wheel to participate in grinding through low speed reciprocating swings of the cambered grinding wheel, homogenizes total wearing capacity of the grinding wheel onto the whole cambered surface of the grinding wheel, achieves home position automation shaping and shape preserving functions of the cambered grinding wheel, and is low in cost and short in processing cycle.

Description

technical field [0001] The invention relates to the technical field of advanced manufacturing of space optical systems, in particular to an in-situ automatic shaping and milling processing method of a grinding wheel for an off-axis aspheric reflector. Background technique [0002] A space camera refers to an aerospace optical imaging remote sensor that orbits the earth and undertakes tasks such as ground detection and deep space exploration. Its core components are multiple ultra-high-precision mirrors. Silicon carbide (SiC) is an ideal material for making mirrors. Materials. Compared with mirror materials such as glass-ceramics (Zerodur) and zero-expansion glass (ULE), silicon carbide (SiC) has more obvious performance advantages as the mirror diameter continues to increase, and it is expected to become the reflector of future space cameras. material of choice for mirrors. However, silicon carbide (SiC) is an ultra-hard and brittle material second only to diamond and cubic...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low processing efficiency existing in the existing single-point oblique axis grinding metho

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