A macro-micro compound constant pressure polishing device and method

Abstract

The invention discloses a macro-micro compound constant-pressure polishing device and method. The method comprises the following steps: adjusting the polishing pressure by utilizing the lever structure, the counterweight at both ends of the lever and the change of the force arm of the lever; When the surface of the core is polished, the polishing position is controlled by the left and right moving axis and the rotating swing axis, and the position of the polishing point in the vertical direction of the mold core is controlled by the space up and down servo axis, which is guaranteed macroscopically by combining the principle of leverage. The polishing pressure is stable; the polishing head is equipped with a pressure sensor and an electromagnetic force device. According to the change of the polishing pressure, the electromagnetic force device is controlled to adjust and compensate the change of the polishing pressure microscopically. The closed-loop control ensures the constant pressure of the polishing process. The present invention controls the constant polishing pressure through a macro-micro compound method, and has higher control precision.

Description

technical field [0001] The invention relates to the technical field of optical polishing, in particular to a macro-micro composite constant pressure polishing device and method. Background technique [0002] With the development of optoelectronic technology, more and more aspherical lenses are used in optical systems to improve the disadvantages of large aberration, small field of view and large volume of optical systems in traditional spherical lens optical systems. There are two commonly used aspheric lens manufacturing techniques, cold processing and hot pressing. Cold processing technology includes grinding and polishing of lens blanks. This technology has low production efficiency and is often used in the manufacture of large-diameter optical lenses in the fields of astronomy and military industry. Hot press forming technology uses high-precision molds to heat the lens blank and apply a certain pressure when the glass lens is in a high elastic state. After a certain pe...

AI Technical Summary

Problems solved by technology

However, this method has a large pressure control range, which is prone to overshoot and makes the polishing pressure too high.

The Chinese invention patent with the publication number CN104772661A is a processing method for full-band high-precision aspheric optical elements. Iterative processing is used to gradually converge the polished surface shape, but the polishing iteration time is long

[0005] Due to the errors of various factors in the existing patented polishing technology, including polishing pressure, polishing speed, polishing residence time and the precision of the equipment, the convergence time of the polished surface shape error is long, and it needs to undergo multiple superimposed polishings to gradually converge.

Among them, constant pressure polishing is difficult to control within a small error range, resulting in excessive errors between the polishing removal model and theoretical calculations, which eventually lead to errors between the actual polishing effect and the theoretical polishing effect

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