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Large-caliber reflection mirror iterative precompensation grinding method based on grinding wheel wear prediction

A large-diameter mirror and pre-compensation technology, applied in grinding/polishing equipment, grinding machines, optical surface grinding machines, etc., can solve the problems of low surface accuracy, low grinding efficiency, grinding wheel loss, etc., and achieve grinding efficiency. Improves, increases service life, avoids replacement and repeated grinding effects

Active Publication Date: 2017-11-24
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that in the prior art, the target surface accuracy is achieved by repeatedly replacing the grinding wheel and grinding repeatedly under the condition of a fixed nominal grinding depth, resulting in serious wear of the grinding wheel, poor surface accuracy and low grinding efficiency. problem, and proposed an iterative pre-compensation grinding method for large-aperture mirrors based on grinding wheel wear prediction

Method used

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  • Large-caliber reflection mirror iterative precompensation grinding method based on grinding wheel wear prediction
  • Large-caliber reflection mirror iterative precompensation grinding method based on grinding wheel wear prediction
  • Large-caliber reflection mirror iterative precompensation grinding method based on grinding wheel wear prediction

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specific Embodiment approach 1

[0022] Specific implementation mode one: as figure 2 As shown, an iterative precompensation grinding method for large-aperture mirrors based on grinding wheel wear prediction includes the following steps:

[0023] Firstly, the size and wear prediction model of metal bonded diamond grinding wheel is established, and the metal bonded arc-shaped diamond grinding wheel is selected according to the characteristics of the aspheric mirror body material-SiC ceramic material. The bonding strength of the bond is high, which can effectively improve the service life of the grinding wheel. On this basis, the organizational parameters and shape parameters of the grinding wheel are determined; using the principle of grinding ratio, the metal bonded diamond grinding wheel is used for grinding experiments to determine the relationship model between the size of the grinding wheel, the volume of material removed by grinding, and the grinding process parameters. Predict wheel size wear for diffe...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the surface shape error prediction model of the contact point between the grinding wheel and the workpiece on the aspheric generatrix in the grinding process is established in the step three, specifically:

[0036]

[0037] where E x is the aspheric grinding surface shape error at the x-coordinate point away from the center of rotation on the aspheric generatrix, expressed by the difference between the aspheric detection vector height and the aspheric ideal vector height, β x is the inclination angle of the tangent at point x from the center of rotation on the aspheric generatrix.

[0038] On the basis of the diamond grinding wheel size and wear prediction model, the generatrix expression of the rotary aspheric mirror, the initial grinding parameters and process parameters are given, and the grinding is analyzed based on the grinding principle, aspheric surface profile mod...

specific Embodiment approach 3

[0040] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: if the grinding surface shape error value of the x coordinate point is greater than the target surface shape error value in the step 4, then the nominal grinding surface of the x coordinate point The specific process of iterative precompensation processing for cutting depth is as follows:

[0041] By increasing the nominal grinding depth of the grinding point to compensate the aspheric surface error caused by the wear of the grinding wheel, the grinding surface error value of the x-coordinate point is converted and superimposed on the nominal grinding depth, and the superposition is Grinding at the new nominal grinding depth, and calculating the surface error value after iterative pre-compensation; after multiple iterations of pre-compensation until the predicted value of the grinding surface error at the x coordinate point is less than the target surface error value,...

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Abstract

The invention relates to a large-caliber reflection mirror iterative precompensation grinding method, in particular to a large-caliber reflection mirror iterative precompensation grinding method based on grinding wheel wear prediction. In order to solve the problems that in the prior art, under the fixed nominal grinding depth, the target surface figure accuracy is achieved through repeated replacement of a grinding wheel for repeated grinding, consequently, the grinding wheel losses are serious, the surface figure accuracy is poor, and wear efficiency is low, the method comprises the steps of building a predication model of the grinding wheel grinding ratio G about the grinding parameter, secondly, building a radial size wear amount predication model at the grinding wheel wear point in the grinding process, thirdly, building a non-spherical-face surface-shape error predication model, fourthly, through the iterative precompensation method, calculating wear surface-shaped error values of all points on a non-spherical-face generatrix until the requirements are met and fifthly, recording nominal grinding depth final predication values of all contact points in the iterative process, and carrying out numerical control grinding machining programming and subsequent machining. The method is used for the technical field of grinding machining of an optical non-spherical-face reflection mirror.

Description

technical field [0001] The invention relates to the technical field of grinding of optical aspheric mirrors, in particular to an iterative pre-compensation grinding method for large-diameter mirrors. Background technique [0002] With the rapid development of aerospace technology, the far-reaching exploration of the universe and space by humans has become more and more frequent, and there is a demand for higher precision in space optical systems. Optical mirrors are key components of space optical equipment (such as space telescopes, etc.). The requirements for the accuracy, stability and life of the mirror substrate are getting higher and higher, and the requirements for material performance are more stringent. The current space lens materials mainly use silicon, optical glass, SiC ceramics, etc. SiC ceramics have specific strength, With the advantages of high specific stiffness, high corrosion resistance and high dimensional stability, it is more and more widely used in ae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B13/00
CPCB24B13/00
Inventor 刘立飞张飞虎付鹏强
Owner HARBIN UNIV OF SCI & TECH
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