Magnetorheological finishing device for super large caliber aspheric surface optical part

Abstract

The invention relates to a magnetic rheological polishing device used in an aspheric optical part with a super large caliber, comprising a machine tool, a magnetic rheological polishing device and a control system which is connected with the above components. The machine tool comprises a lathe bed on which the work piece to be processed is placed, an X axial linear motion mechanism is arranged on the two sides of the lathe bed, a movable portal is fixed on a slider of the X axial linear motion mechanism, a Y axial linear motion mechanism is arranged on a cross beam of the movable portal, a Z axial linear motion mechanism is fixed on a slider of the Y axial linear motion mechanism, an A axial rotary table used for arranging the magnetic rheological polishing device is fixed on a slider of the Z axial linear motion mechanism, the magnetic rheological polishing device is fixed on the cross beam by a fourth linear motion mechanism, the two have opposite directions of motion, and the magnetic rheological polishing device is arranged right above the work piece to be processed. The device of the invention has the advantages of simple and compact structure, low cost, easy control and strong processing capacity, and can process the aspheric optical part with the super large caliber.

Description

technical field [0001] The invention mainly relates to the technical field of magnetorheological polishing, in particular to a magnetorheological polishing device for super-large diameter aspherical optical parts. Background technique [0002] According to the Rayleigh criterion, the optical system can distinguish the limiting angular distance between two object points in the far field Δθ=1.22λ / D, where D is the effective aperture of the optical system, so increasing the effective aperture of the optical system is the key to improving the resolution of the optical system basic way. Taking the space camera as an example, the height of the satellite is about 200-300km. In order to obtain high resolution, the aperture of the camera is required to be at least 0.5-1m. In the field of space telescopes, the diameter of the primary mirror is also getting larger. For example, the EUR050 telescope of the European Southern Observatory has a primary mirror with a size of 50m and is com...

AI Technical Summary

Problems solved by technology

Since the magnetorheological polishing fluid cannot be recycled in this device, it cannot be guaranteed that the composition of the magnetorheological polishing fluid will not change for a long time, that is, the "polishing mold" will not change, and the processing time of large-scale optical parts Very long, so the system is not suitable for the processing of large-sized optical parts

Chinese patent application number: 200610043079.1, invention name: magnetorheological flexible fine grinding and polishing equipment and method, this invention can not solve the problem of large-diameter optical parts processing

The key technical problems of magneto-rheological processing machine tools for super-large-diameter optical parts mainly include the following points: (1) The precision control problem of super-large-diameter optical parts in the process of magnetorheological processing: the processing of traditional optical parts usually requires a turntable to To realize the clamping and rotation of the workpiece, however, for super-large-caliber optical parts, such a large-scale high-precision turntable is unacceptable in terms of cost. Internationally, for heavy-duty super-large-caliber optical parts, multi-point support or ring-belt support is often used. However, this kind of support cannot be used for super-large-diameter lightweight parts. This kind of support cannot fix the workpiece, and it will cause large dimensional deformation during processing. Therefore, for super-large-diameter aspheric optical parts, it is necessary Appropriate support and clamping form

(3) At present, the magnetorheological fluid nozzle and recovery part in the magnetorheological polishing device are located above the workpiece, while the magnetorheological fluid circulation device is placed in the control cabinet outside the machine tool, when used for processing super large diameter parts When the large range will cause the pipeline connection between the processing part of the magnetorheological polishing device and the magnetorheological polishing liquid circulation device to be too long, the large-scale movement of the magnetorheological polishing liquid pipeline and the magnetorheological Excessive changes in the height difference between the inlet and outlet of the liquid interfere with the stability of the performance of the magnetorheological polishing fluid, so it is necessary to solve the problem of affecting the stability of the performance of the magnetorheological polishing fluid caused by large-scale movement

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