Method for performing aligning processing on non-spherical optical element by magneto-rheological polishing wheel

Abstract

The invention provides a method for performing aligning processing on a non-spherical optical element by a magneto-rheological polishing wheel, and the method can realize a positioning method for precisely aligning the magneto-rheological polishing wheel (a removal function) to a large-caliber non-spherical optical element. The method comprises the following steps of: step a, original point calibrating of the removal function, wherein the original point calibrating comprises the following specific steps of: a1, fixing a standard hollow cylinder; a2, aligning a measuring head on a numerical-control machine tool to the standard hollow cylinder; and a3, aligning the position of the lowest point of a polishing wheel to the standard hollow cylinder; step b, non-spherical optical element positioning which comprises the following specific steps of: b1, arranging the non-spherical optical element on a rotary table of the numerical-control machine, and fixing the non-spherical optical element; and b2, calculating a to-be-moved position of the polishing wheel if processing is needed for a set point on the non-spherical optical element when the polishing wheel performs processing on the non-spherical optical element with a set polishing gap of h.

Description

technical field [0001] The invention belongs to the technical field of optical element processing, and in particular relates to a method for aligning an aspheric optical element with a magneto-rheological polishing wheel. Background technique [0002] Because aspheric surfaces can correct aberrations, increase the field of view, improve image quality, and reduce the number of optical components in the system, thereby effectively reducing weight and reducing costs, aspheric surfaces have been widely used in optical systems such as modern astronomical observations and earth observations. Applications. The caliber of modern optical telescopic systems is getting bigger and bigger, so the aspherical surface in the optical system is also getting bigger and bigger. At present, foreign countries have been able to process aspheric surfaces with a caliber of 8m, and domestic ones are also gradually developing towards 2-4m caliber. Magnetorheological Finishing (MRF) technology, as an ...

AI Technical Summary

Problems solved by technology

However, the removal function of wheel magnetorheological polishing is D-shaped non-circular symmetry, and the origin position cannot be directly determined according to the geometric position of the removal function. It is necessary to find out the corresponding relationship between a certain position in the removal function area and a specific point on the polishing wheel.

Secondly, for meter-level or larger aspheric optical elements, after they are placed on the load table of the machine tool, there are generally errors such as tilt and offset.

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