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Numerical control milling and grinding forming method for off-axis aspherical mirror

An off-axis aspheric and aspheric technology, which is applied in the direction of digital control, optical surface grinder, grinder, etc., can solve the problems of low processing efficiency, complex aspheric surface error source factors, affecting processing accuracy, etc., to improve processing efficiency. Effect

Active Publication Date: 2021-11-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when modifying the aspheric surface in finishing, too large tool path pitch will lead to obvious insufficient removal and poor surface roughness
In order to improve the surface quality, the pitch of the tool path is usually less than 0.2mm. For large-diameter aspheric surfaces, the total length of the tool path will be very large, and the processing time will be longer; especially when processing meter-level aspheric surfaces, affected by tool wear, a The tool has to be changed if it is difficult for the tool to go through the entire tool trajectory. After the tool change, there will usually be tool contact marks on the aspheric surface, and because the tool parameters of different tools are different, the source of the aspheric surface shape error will inevitably be Complicated, it brings great difficulty to the post-compensation processing and seriously affects the processing accuracy
Therefore, the processing of large-diameter aspheric mirrors, especially meter-level aspheric mirrors, in the prior art still has the problems of severe tool wear caused by too long tool trajectory, low processing efficiency, and difficulty in compensating for the low aspheric precision caused by processing.

Method used

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  • Numerical control milling and grinding forming method for off-axis aspherical mirror
  • Numerical control milling and grinding forming method for off-axis aspherical mirror
  • Numerical control milling and grinding forming method for off-axis aspherical mirror

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A large-diameter aspheric mirror numerical control milling forming method, the equation of the generatrix equation f1 of the aspheric mirror is: z 2 =2*R 0 *x-(1+k)*x 2 , where R 0 is the radius of curvature of the apex of the aspheric surface, k is the quadratic conic coefficient, x is the independent variable on the abscissa, and z is the corresponding ordinate at the x coordinate; the positioning accuracy of the CNC machine tool used for milling and grinding is β, and the processing of the aspheric mirror The steps are as follows:

[0049] 1) According to the radius of curvature R of the apex of the aspheric surface 0 , center thickness H 0 , caliber D is processed on the aspheric lens body material with a radius of R 0 , center thickness H 1 , the starting spherical surface of caliber D; here 0≤H 1 -H 0 ≤0.5;

[0050] 2) Fix the aspheric mirror body in step 1) on the CNC machine tool turntable, and the optical axis of the aspheric mirror body coincides with...

Embodiment 2

[0091] Taking a specific aspheric surface as an example, the method in Embodiment 1 is further described. k=-0.98,R 0 =3000, D=1000, machine tool positioning accuracy β=0.001.

[0092] A large-caliber aspheric mirror numerical control milling forming method, according to the apex curvature radius R of the aspheric surface 0 =3000, center thickness H 0 =200, caliber D=1000, a radius of 3000, center thickness H is machined on the aspheric mirror body material 1 =200.2, caliber 1000 starting spherical surface;

[0093] The ring tool is made of electroplated diamond grinding wheel with an outer diameter of T D =550, the radius of the rounded chamfer between the outer diameter and inner diameter of the ring tool is r 0 = 5;

[0094] dx is obtained by solving the busbar equation of the Nth ring, the N-1th ring, the positioning accuracy is denoted as β, and the aspheric mirror

[0095] dx=30.9 calculated by the above relationship, N=17 after taking the integer, and recalculate...

Embodiment 3

[0102] A large-diameter aspheric mirror CNC milling and grinding forming device, the equation of the generatrix equation f1 of the aspheric mirror is: z 2 =2*R 0 *x-(1+k)*x 2 , where R 0 is the radius of curvature of the apex of the aspheric surface, k is the quadratic conic coefficient, x is the independent variable on the abscissa, z is the ordinate corresponding to the x coordinate, and the caliber is D; the positioning accuracy of the CNC machine tool used for milling and grinding is β, where It is characterized in that: the numerically controlled machine tool has at least two translational motion axes, X axis and Z axis, and two rotation axes, B axis and C axis, wherein the B axis is the rotation axis around the Y axis, and the C axis is the rotation axis around the Y axis. The axis of rotation of the Z axis, and the axis of rotation of the turntable of the CNC machine tool is located at the C axis; the spindle of the CNC machine tool is located at the Z axis; the ring ...

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Abstract

The invention belongs to the field of optical machining, and discloses a numerical control milling and grinding forming method foran off-axis aspherical mirror in order to solve the problems that meter-scale large-caliber aspherical machining consumes long time and a cutter is seriously abraded. An aspherical mother mirror is dispersed into a series of annular belts with different radiuses, and an annular grinding wheel cutter is used for machining the annular belts in sequence through generating; the annular belts are arranged at equal intervals, the total number of the annular belts is N, the width of any annular belt is jointly determined by the Nth annular belt, the (N-1) th annular belt, the positioning accuracy and a generatrix equation of the aspherical mirror, and the curvature radius Rn of the Nth annular belt is equal to sqrt(R02-k*(n*dx)2); and an aspherical surface is enveloped by the numerous annular belts. The diameter of the cutter used for machining is larger than the semi-caliber of the aspherical surface, the contact between the cutter and the surface of a workpiece is an annular belt, and therefore when the large-caliber aspherical surface is machined, the service life of the large annular cutter is far longer than that of a cutter in a traditional machining mode; and the distance between the annular belts is far larger than the traditional machining screw pitch, so that the machining efficiency is remarkably improved, and high practicability is achieved.

Description

[0001] The application is the application number: 2019113563835, the application date is December 25, 2019, and the title is: a divisional application for a large-diameter aspheric mirror CNC milling and polishing method. technical field [0002] The invention belongs to the field of optical processing and relates to a numerical control processing method for large-diameter aspheric optical elements. Background technique [0003] Aspheric optics can correct a variety of aberrations in the optical system, improve imaging quality, and improve system identification capabilities. Aspheric mirror is a very important optical element in the optical system. It can replace multiple spherical elements with one or several aspheric elements, thereby simplifying the structure of the instrument, simplifying the structure of the system, shortening the length, and effectively reducing the weight of the instrument. The design of the spherical optical system can greatly simplify the calculatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B13/00B24B13/01
CPCB24B13/00B24B13/01G05B19/19G05B2219/45145G05B2219/45157G05B15/02
Inventor 陈曦戴卓成朱永翔李晨超
Owner SUZHOU UNIV