Deformable polishing abrasive disc based on thermoplastic material

Abstract

The invention provides a deformable polishing abrasive disc based on a thermoplastic material. According to the abrasive disc, a flexible layer of which hardness is reduced along with temperature rise is added into a structure of the polishing abrasive disc so as to enable the polishing abrasive disc to have certain deformation capacity. In an aspheric optical element machining process, it can be guaranteed that a machining face of the polishing abrasive disc matches a spherical face of an aspheric optical element, and the material removal stability is improved, so that a diameter size of a deformable base plate of the polishing abrasive disc can be increased, a larger-caliber polishing disc can be applied in the aspheric optical machining process, and the machining efficiency is improved; and meanwhile, the flexible layer is made of the thermoplastic material of which hardness is reduced along with the temperature rise, a temperature of the polishing abrasive disc is changed by heating an electric heating sheet so as to control overall rigidity of the polishing abrasive disc, the polishing abrasive disc has surface shape error removal and smoothing effects, an application range of the polishing abrasive disc is widened, and the polishing abrasive disc has the advantages of being simple in structure and low in cost. And the cost is low.

Description

technical field [0001] The invention belongs to the technical field of optical device processing, in particular to a deformable polishing disc based on thermoplastic material. Background technique [0002] Using an aspheric surface can effectively improve the imaging quality of the optical system and simplify the system structure. Therefore, aspheric optical elements are widely used in modern optical systems. Compared with spherical or flat optical elements, the curvature of each point on the surface of an aspheric optical element is different, and the large-size rigid polishing disc cannot adapt to the changing curvature of the aspheric surface, so it cannot meet the processing requirements of aspheric optical elements. At present, the main processing method of aspheric optical elements is the computer surface molding technology using computer-controlled small grinding and polishing discs. This method is typically processed using polishing discs that are much smaller in si...

AI Technical Summary

Problems solved by technology

For the aspheric surface with high steepness and large curvature change, higher flexibility is required. For the flying spherical surface with low steepness and small curvature change, the rigidity requirement is higher. Therefore, the same non-Newtonian body is more versatile in polishing Difference

In addition, due to the deformation characteristics of the non-Newtonian body itself, when the non-Newtonian body polishing plate protrudes from the mirror surface at the edge of the aspheric surface, the non-Newtonian body will deform the surface of the polishing plate, which may cause a large material removal at the edge and form a sag

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