Ultraprecise grinding method for special-shape thin-wall complex-structure workpiece

Abstract

The invention provides an ultraprecise grinding method for a special-shape thin-wall complex-structure workpiece, and relates to a machining technology. According to the ultraprecise grinding method, clamping errors caused by secondary clamping are reduced, the precision of the machined surface shape of the workpiece is guaranteed, and a bulb grinding wheel rod and the workpiece do not interfere with each other. The ultraprecise grinding method includes the steps that the accurate size of the precisely-machined workpiece is obtained, the front end of a workpiece inner rod is clamped, and the clamped portion of the workpiece is subjected to ultraprecise grinding in a mutual-reference mode; a fine-grain metal-based diamond bulb grinding wheel for ultraprecise grinding is installed, and the sphere center of the bulb grinding wheel is adjusted onto the rotating axis of a precise rotating table. The workpiece is installed on a workpiece main shaft through a collet chuck, and it should be guaranteed that the radial play eccentricity of the workpiece is smaller than 5 microns in the installation process. Tool setting for the workpiece is conducted through a CCD tool setting system, and a machining original point is obtained so that the high precision of the surface shape of the machined workpiece can be guaranteed. Ultraprecise grinding of the special-shape thin-wall complex-structure workpiece is achieved by planning the movement track of the bulb grinding wheel.

Description

Technical field [0001] The invention relates to a processing technology, in particular to a processing method for a workpiece with a special-shaped thin-walled complex structure. Background technique [0002] With the rapid development of aerospace, electronics industry and optics research, the processing requirements for the surface accuracy and surface roughness of special-shaped and complex structure parts are becoming higher and higher, and this type of parts is also developing in the direction of miniaturization and profile. A Ψ-shaped part in the aerospace field has an overall size of less than 50mm, a hemispherical diameter of less than 30mm, and a wall thickness of less than 1mm, and the radius of curvature of the chamfer at the connection between the inner and outer spherical shells and the inner and outer rods is less than 2mm, and the part is made of fused silica, which is a typical difficult-to-machine special-shaped thin-walled complex structure. At the same time, t...

AI Technical Summary

Problems solved by technology

[0003] Therefore, in the existing technology, there are: the clamping error introduced by the conversion of the processing device before the ultra-precision grinding of the special-shaped thin-walled complex structure workpiece, accurate and fa...

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