Five-bar linkage for aspheric component polishing

Abstract

The invention discloses a five-linkage-rod mechanism for non-spherical element polishing. The mechanism mainly comprises a machine frame, main shafts, crank sliding tables, spherical hinge mechanisms,connecting rod sliding tables, connecting rods, a workpiece, positioning measuring tools, a floating head, a control box, a pitch lap and a rapid disassembling module, the two main shafts, the cranksliding tables, the spherical hinge mechanisms, the connecting rod sliding tables and the connecting rods form the closed two-spherical-hinged three-degree-of-freedom five-rod mechanism, the two positioning measuring tools accurately determine the position of the workpiece relative to the two main shafts, the control box is used for controlling the rotating speed and the rotating angle of the mainshafts, the length of the crank sliding tables and the length of the connecting rod sliding tables through reading codes, and the connecting rods drive the pitch lap to realize polishing machining. The five-linkage-rod mechanism is a mechanism which is based on three-degree-of-freedom five-connecting-rod mechanism based on the two-spherical-hinged three-degree-of-freedom five linkage rods, controllable residence time type polishing is realized according to the traditional manual polishing characteristic design, the mechanism is suitable for various non-spherical elements, the single removal amount can be controlled at the nanometer level, and the advantages of being flexible in movement, high in reliability, high in machining quality, capable of effectively restraining medium-frequency errors and the like are achieved.

Description

technical field [0001] The invention relates to optical processing, in particular to a five-link mechanism for polishing aspherical elements, which is applicable to ultra-precise polishing of complex aspheric elements. [0002] technical background [0003] Aspheric elements are widely used in optical systems, which can improve aberration correction capabilities, improve image quality, expand field of view, increase operating distance, reduce system costs and effectively reduce equipment quality. One of the important parts. [0004] In the patent "Numerical Control Double Pendulum Mechanism for Polishing Aspheric Optical Elements" (Patent Publication No. CN106826543A), a numerical control double pendulum mechanism for aspheric optical elements is introduced. This mechanism performs polishing by automatically adjusting the height of the polishing disc. There are two main problems: [0005] The mechanism actively controls the trajectory of the polishing disc through the motor...

AI Technical Summary

Problems solved by technology

[0005] The mechanism actively controls the trajectory of the polishing disc through the motor. The mass of the mechanism is large, and the motor cannot respond at high speed and high precision according to the surface shape of the workpiece, resulting in inflexible movement of the polishing disc and high requirements for the trajectory synthesis of the control and execution system;

[0006] Because the mechanism synthesizes the trajectory through the motor, the polishing disc and the workpiece cannot be completely attached, and the resulting uneven and uncontrollable pressure will lead to uneven removal, resulting in large processing errors

[0007] In summary, the above-mentioned invention cannot guarantee higher processing quality, and is not enough to replace the manual polishing method

[0008] Traditional computer-controlled surface shaping (CCOS) technology plans a relatively orderly polishing path, has low processing flexibility, and cannot effectively suppress the intermediate frequency error caused by orderly processing. In many cases, skilled workers are still required to manually repair and polish. Repairing and polishing has the disadvantages of high labor intensity, the surface shape cannot be precisely controlled, and experienced operators are required.

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