Planetary grinding device and grinding method for planar optical element

Abstract

The invention discloses a planetary grinding device and a grinding method for a planar optical element. According to the planetary grinding device and method for the planar optical element, the lowerend face of a workpiece disc and the upper end face of a grinding table are arranged in parallel, the grinding table and the workpiece disc can rotate in a mutually non-coaxial mode, a plurality of clamp positioning holes are formed in the workpiece disc, the multiple clamp positioning holes are circumferentially arrayed with the axis of a driving shaft of the workpiece disc as the center, the to-be-machined optical element is clamped through a clamp, the to-be-ground end face of the to-be-machined optical element makes contact with the upper grinding end face after being limited through the workpiece disc, and finally the pressure between the to-be-machined optical element and the grinding table is adjusted through a pressure applying device, and the contact stability between the to-be-machined optical element and the grinding table is ensured. The device is simple in structure, the grinding speed of the planar optical element is greatly increased through mutual rotation of the grinding disc and the workpiece disc in a planetary motion mode, the same pressure is kept in real time through the pressure applying device in the grinding process, the flatness of workpiece machining is guaranteed, and the machining efficiency of the whole machining technology is improved.

Description

technical field [0001] The invention relates to the field of precision machining, in particular to a planetary grinding device and a grinding method for a plane optical element. Background technique [0002] Optical glass has excellent properties such as high strength, high hardness, and high wear resistance, and is widely used in defense and civilian fields such as electronics and machinery. Optical glass goes through grinding, grinding, polishing, coating and other processes from blank to forming. Among them, grinding, as a process between grinding and polishing, plays a link between the preceding and the following. The flatness of the components during the grinding process plays an important role in the subsequent polishing and application of the components. Poor flatness will result in low efficiency of subsequent polishing and reduce the optical quality. For the imaging and light-gathering quality of components, the current grinding methods for small optical glass main...

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Problems solved by technology

Among them, grinding, as a process between grinding and polishing, plays a link between the preceding and the following. The flatness of the components during the grinding process plays an important role in the subsequent polishing and application of the components. Poor flatness will result in low efficiency of subsequent polishing and reduce the optical quality. For the imaging and light-gathering quality of components, the current grinding methods for small optical glass mainly adopt manual grinding method and mechanical grinding method, and the glass sample is held in hand, and the surface is contacted with a grinding disc for grinding; this method has the following drawbacks: 1. It is difficult to ensure that the surface of the workpiece is always parallel to the surface of the grinding disc when holding the workpiece, and one end will be inclined, which will cause a large amount of removal at the lower part of the inclination of the workpiece, and a small amount of removal at the other part, resulting in poor flatness; After the disc rotates, when the rotation speed is greater than 50r / min, the workpiece is easily dropped from the hand by the force brought by the rotating grinding disc; the third is that the method of holding the workpiece is difficult to ensure the rotation of the workpiece, which will cause the removal of some areas It will always be very large, and the other part will always be small, the material removal is very uneven, and the flatness of the plane is not good; fourth, in terms of operability, the hand-held method is laborious, and the machine needs to be stopped to adjust the hand posture during processing, which is too inefficient.

Mechanical grinding method: Although the workpiece is clamped by the workpiece disc instead of the manual method, the workpiece is easy to shake back and forth on the workpiece disc due to the friction force brought by the grinding disc speed during the grinding process, and the machining accuracy is greatly reduced; the workpiece disc cannot rotate, only Grinding disc rotates, material removal efficiency is low

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