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A Method for Generating Polishing Paths with Averaging Errors

A polishing path and error technology, applied in the direction of grinding/polishing equipment, optical surface grinder, grinding machine, etc., can solve the problems of difficult processing, high cost, workpiece alignment error, etc., to avoid adverse effects, smooth surface, homogenization effect of error

Active Publication Date: 2017-09-12
BEIJING GUOWANG OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of difficult processing and high cost due to the errors caused by the inaccurate position of the grinding head, the shape error of the grinding head, and the alignment error of the workpiece in the existing polishing process, the present invention provides a polishing path that can average errors generation method

Method used

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  • A Method for Generating Polishing Paths with Averaging Errors

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specific Embodiment approach 1

[0015] Specific implementation mode 1. Combination figure 1 Describe this embodiment, the generation method of the polishing path that can average the error, this method is realized by the following steps:

[0016] Step 1, determine a point O outside the element O' as the intersection point of the extension line of the path;

[0017] Step 2, take the point O as the center, make a ray at an equal angle θ, and keep the part of the ray passing through the optical element O';

[0018] Step 3: For each ray retained in step 2, truncate, and only keep the part within the diameter of the component D×(1+k), where k is the edge-out ratio of the grinding head.

[0019] Step 4. For each line segment retained in step 3, perform equidistant division according to the fixed length l to form a series of dwell points at equidistant intervals.

[0020] Step 5: Calculate the dwell time of each dwell point according to the dwell points generated in step 4 and the surface error of the optical ele...

specific Embodiment approach 2

[0024] Specific embodiment two, combine figure 1 This implementation mode is described. This implementation mode is an example of the method for generating the polishing path of the homogenization error described in the first specific implementation mode. The specific steps are:

[0025] Step a: Assuming that for a circular workpiece surface, first determine a point O outside the component O' as the intersection point of the extension line of the path. Preferably, the angle between the line connecting OO' and the horizontal line is in the range of 30° to 45°, which can make the processing The motion errors in both XY directions of the device are averaged. Preferably, the distance between OO' should be 1.5-2 times the radius of the element.

[0026] Step b: Take the point O as the center, draw a ray at an equal angle θ, and keep the part of the ray passing through the element O'. According to the size of the component caliber, the angle between the rays can be adjusted approp...

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Abstract

The invention aims to provides a generating method of a polishing path with the function of error normalization, and relates to the field of photoprocessing. The polishing path can be used for normalizing errors, which are caused by the accuracy of a machine tool and the position and the shape of a grinding head, avoids negative influences, which are caused by the errors, and enables the finally processed surface to be smoother and be higher in accuracy. The generating method comprises the following steps: at first, determining a point outside an element and transmitting rays with uniform angles from the point; remaining the rays passing through the element and dividing the rays at equal distances; then calculating the residence times of points according to surface-shape errors; and at last, doing reciprocating movement along a path in sequence, wherein the projection on the element of the axial line of the grinding head always coincides with the path where the grinding head is positioned. Under the condition that a conventional device and related accessories are not changed greatly, the negative influences caused by errors are reduced, and the performance and the using value of low-precision devices are improved.

Description

technical field [0001] The invention relates to the technical field of optical processing, in particular to a method for generating a polishing path capable of averaging errors. Background technique [0002] In optical processing, the polishing grinding head is usually driven by the processing equipment along a certain path to process the surface of the optical element. However, in actual processing, there are always various errors, such as the error caused by the lack of precision of each axis of the processing equipment, the error caused by the inaccurate position of the grinding head, the shape error of the grinding head, the alignment error of the workpiece, and so on. These errors will lead to the reduction of surface shape convergence rate and the degradation of intermediate frequency of components in actual processing. In severe cases, processing lines may be left or even intermediate frequency enhancement may occur. If you want to reduce the impact of this phenomeno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B13/00
CPCB24B13/00
Inventor 王绍治刘健隋永新杨怀江
Owner BEIJING GUOWANG OPTICAL TECH CO LTD