A way to evenly remove extra material
An additional and uniform technology, which is applied in the direction of grinding machine parts, workpiece feed movement control, grinding machines, etc., can solve the problems of destroying the surface shape of optical elements and difficulty in ensuring the uniformity of additional materials, so as to achieve uniform removal of additional materials, Strong operability and applicability, and the effect of maintaining intermediate frequency error
Active Publication Date: 2020-10-30
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
However, the existing smoothing process of semi-rigid disks has defects such as difficulty in ensuring the uniformity of additional material removal, and damage to the surface shape of optical components.
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[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0043] A method for uniform removal of extra material based on combination smoothing, comprising the following steps:
[0044] 1. Select smooth processing parameters:
[0045] like figure 2 As shown, the diameter of the fairing disc is 60mm, the diameter of the circular mirror surface of the workpiece is 100mm, the smoothing pressure P=20kPa, and the mirror speed ω m =-32rpm, smooth disc speed ωp and mirror rotation speed ω m The ratio is called the speed ratio w r , the range is between -2 and 2, and the rotational speed directions of the smooth disc and the mirror are the same or opposite. The absolute value of the feed speed v of the smooth disk and the rotation speed of the mirror |ω m The ratio of | is called the relative feed speed of smooth disk, and the value is 15mm / r, f z Indicates the smooth disk feed range, f z1 In...
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The invention discloses a method for uniformly removing extra materials. The method comprises the following steps of (1), measuring the surface shape of a to-be-processed optical element; (2), aimingat a measurement result of the surface shape of the to-be-processed optical element, selecting no more than five groups of fairing parameter combinations from a preset fairing function library to formto-be-selected processing schemes, carrying out optimizing calculation on a minimum root-mean-square error value of the extra material removal amount of each to-be-selected processed scheme, and thenselecting the minimum value in all the optimization calculation results, and outputting the fairing parameter combinations in the to-be-selected processing schemes corresponding to the value and thefairing time of each group of fairing parameter combination; and (3), carrying out fairing processing on the to-be-processed optical element by adopting the fairing-parameter combinations selected instep (2) and the fairing time of each fairing parameter combination. The method for uniformly removing the extra materials has the advantages of simple process flow and strong operability; and meanwhile, the method is based on combined fairing, so that the surface shape of the optical element is not damaged while the intermediate frequency error of the optical element after fairing is converged.
Description
technical field [0001] The invention belongs to the technical field of optical parts polishing, and relates to a shape-preserving and smoothing method for optical elements, in particular to a method for uniformly removing extra materials. Background technique [0002] The control process of the error in different frequency bands of optical components is different. The low-frequency error mainly depends on the modification process of the small-size removal function. Generally, different material removal is achieved by controlling the dwell time of the removal function at different positions. The control of high-frequency errors is mainly accomplished by means of ultra-smooth processing technology. The principle is to use the interface chemical reaction between nano-abrasives and the surface of the workpiece to achieve atomic-level material removal. For the intermediate frequency error components on the optical components, the smoothing process is mainly used to suppress the i...
Claims
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IPC IPC(8): B24B13/00B24B49/02B24B49/00
CPCB24B13/00B24B13/0031B24B49/006B24B49/02
Inventor 宋辞石峰田野薛帅林之凡雍嘉浩
Owner NAT UNIV OF DEFENSE TECH