A method for aligning aspherical optical elements with a magnetorheological polishing wheel
A magnetorheological polishing and optical element technology, applied in the field of optical element processing, can solve the problems of inclination and offset, the origin position cannot be determined, etc., and achieve the effect of short test time, low workpiece alignment cost, and clear physical concept.
Active Publication Date: 2018-04-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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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[0053] A magnetorheological polishing removal function calibration and aspheric alignment method of the present invention. The object of this embodiment is a permanent magnet type magnetorheological polishing system (MRF360) with a diameter of 360mm, which is integrated to a 2.5 m Longmen five-axis linkage CNC center with large-diameter aspheric surface processing capability.
[0054] As shown in Figure 4(a) and Figure 4(b), the typical removal function of wheel magnetorheology and the distribution of removal rate in different directions. It can be seen that the removal rate is distributed axisymmetrically in one direction, and the distribution in the other direction is completely asymmetrical.
[0055] The MRF360 is actually calibrated to remove the origin of the function using step a of the present invention. Fix the cylinder, the lowest point of the polishing wheel is aligned with the standard cylinder, the polishing wheel is continuously lowered, and the standard cylinder or t...
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The invention provides a method for aligning a magneto-rheological polishing wheel with an aspheric optical element. The method can realize a positioning method for precise alignment between a magneto-rheological polishing wheel (removal function) and a large-diameter aspheric optical element. The method includes the following steps: Step a. Calibrating the origin of the removal function, including the following specific steps: a1 fixing a standard hollow cylinder. a2 Align the probe on the CNC machine with the standard hollow cylinder. a3 Align the lowest point of the polishing wheel with the standard hollow cylinder. The positioning of the aspheric optical element in step b includes the following specific steps: b1 setting and fixing the aspheric optical element on the turntable of the numerical control machine tool. b2 When the polishing wheel is processing the aspheric optical element with the set polishing gap h, if the set point on the aspheric optical element is to be processed, the position to be moved by the polishing wheel is calculated.
Description
Technical field [0001] The invention belongs to the technical field of optical element processing, and particularly relates to a method for aligning aspheric optical elements with a magnetorheological polishing wheel. Background technique [0002] Since the aspheric surface 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 cost, aspheric surfaces have been widely used in modern optical systems such as astronomical observation and earth observation Applications. The aperture of modern optical telephoto systems is getting larger and larger, so the aspheric aperture in the optical system is also getting larger. At present, foreign countries have been able to process aspheric surfaces with an aperture of 8m, and domestically, they are gradually developing towards the aperture of 2-4m. Magnetorheological Finishing (MRF) technology, as an optical processing meth...
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IPC IPC(8): B24B1/00
CPCB24B1/005
Inventor 张学军薛栋林李龙响王孝坤殷龙海
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI