Airbag-like grinding head for polishing extra-large-deviation-degree aspheric surface

Abstract

The invention provides an airbag-like grinding head for polishing an extra-large-deviation-degree aspheric surface and relates to the technical field of optical cold machining. The problem that a polishing grinding head existing in the prior art is not matched with the surface of a millimeter-magnitude extra-large-deviation-degree aspheric surface workpiece is solved. The airbag-like grinding head comprises a polishing die, a polishing airbag cap, a special elastic material, an airbag framework, a grinding head base, a height adjusting plate, a height adjusting screw, a fastening bolt and a connecting flange. The polishing die is glued to the surface of a polishing airbag and sealed in a closed structure formed by the polishing airbag cap, the airbag framework and the height adjusting plate. The polishing airbag cap is fixedly connected with a trapezoidal sunken part on the outer wall of the airbag framework through a circle of trapezoidal protrusion on the inner wall. The height adjusting plate adjusts height through a jackscrew. The grinding head base and the airbag framework are connected in a fastened mode through an external thread. The grinding head base and the connecting flange are connected in a fastened mode through the fastening bolt. Through elastic deformation of the special elastic material, the airbag-like grinding head is automatically matched with the aspheric surface, machining precision is improved, and high-precision machining of the surface shape of the aspheric surface is achieved.

Description

technical field [0001] The invention relates to the technical field of aspheric advanced optical manufacturing, in particular to an airbag-like grinding head for polishing an aspheric surface with a large deviation. Background technique [0002] Aspheric surface polishing is a difficult point in the field of advanced optical manufacturing technology, especially in how to effectively remove intermediate frequency errors on aspheric surfaces. During the polishing process, the polishing mold is usually attached to the surface of the workpiece, and at the same time, a high-speed relative movement is made to generate a tangential force, so that the tiny protrusions on the glass surface are cut; due to the different curvature radii of each point of the aspheric equation, ordinary polishing grinding It is difficult to achieve a perfect match between the head and the aspheric surface, therefore, it is impossible to obtain high-precision aspheric optics. The currently widely used co...

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Problems solved by technology

[0008] The purpose of the present invention is to propose a kind of airbag-like grinding head for polishing super-large deviation aspheric surface, so as to solve the problem that the intermediate frequency error cannot be effectively corrected due to the mismatch between the surface of the polishing grinding head and the surface of the workpiece in the prior art. Especially to solve the problem that the intermediate frequency error cannot be effectively removed during the aspheric polishing process with a large deviation degree above 0.5mm

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