A deformable polishing disc based on thermoplastic material

Abstract

The invention provides a deformable polishing disc based on thermoplastic material. By adding a flexible layer whose hardness decreases as the temperature rises in the structure of the polishing disc, the polishing disc has a certain deformation ability and can be used in the process of processing aspheric optical elements. It can ensure that the processing surface of the polishing disc is consistent with the spherical surface of the aspheric optical element, which improves the stability of material removal. Therefore, the diameter of the deformed substrate of the polishing disc can be increased, making it possible to apply more in the process of aspheric optical processing. The large-diameter grinding and polishing disc improves the processing efficiency; at the same time, the flexible layer is made of thermoplastic material whose hardness decreases with the increase of temperature, and the temperature of the grinding and polishing disc is changed by heating the electric heating plate to control the overall rigidity of the grinding and polishing disc. The polishing disc has both surface shape error removal and smoothing functions, which improves the scope of application of the polishing disc, and also has the advantages of relatively simple structure and low cost.

Description

technical field [0001] The invention belongs to the technical field of optical device processing, and in particular relates to a deformation grinding and polishing disc based on thermoplastic materials. Background technique [0002] The use of aspherical surfaces can effectively improve the imaging quality of the optical system and simplify the system structure. Therefore, in modern optical systems, aspherical optical components have been widely used. Compared with spherical or flat optical elements, the curvature of each point on the surface of aspheric optical elements is different, and the large-sized 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 aspherical optical components is the computer surface forming technology using computer-controlled small grinding and polishing discs. This method is typically processed usi...

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

Images