Method for visual positioning calibration and corresponding numerical control machining method

A technology for visual positioning and processing of workpieces, applied in metal processing equipment, metal processing mechanical parts, manufacturing tools, etc., can solve the problems of error, large error, pixel and distance proportional relationship error, etc., to achieve less deviation, easy operation, and realization of The effect of calibration

Inactive Publication Date: 2020-01-17
SHANGHAI WEIHONG ELECTRONICS TECH +1
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AI Technical Summary

Problems solved by technology

[0009] The second type: the image algorithm uses pixels as the unit, the machine tool movement uses mm as the unit, and the accuracy of the algorithm itself is ±1 pixel, and the unit used in daily measurement of the workpiece is generally millimeters, which leads to There is an error in the process of using the algorithm and the actual unit conversion (the unit used for the distance is different from the pixel, because the pixel is based on an integer as the unit of measurement, and its accuracy is ±1 pixel, which leads to the fact that if you need to get in the distance measurement process When it is a small value, the pixel cannot meet the corresponding requirements due to the precision relationship. For example, when it needs to be converted to 0.5 pixels, it must be converted to 1 or 0, which leads to an error in the conversion process). For example, the theoretical size of the standard workpiece is 1mm, but the actual size is 1.005mm, which will lead to an error in the proportional relationship between the pixel and the distance, and the farther the position of the photo point is from the camera when shooting, the greater the error will eventually be.

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  • Method for visual positioning calibration and corresponding numerical control machining method
  • Method for visual positioning calibration and corresponding numerical control machining method

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Experimental program
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Effect test

Embodiment 1

[0057] 1. During operation, the CNC machine tool first moves the shooting device to the shooting point (that is, the system preset shooting position), takes a picture and calculates the position of the point, and converts the offset pixel of the feature point A into the offset distance;

[0058] (Assume that point A is offset by 200 pixels from the center of the camera when point A is photographed in step 1, the ratio between pixels and displacement is 100:1, and the final offset is 2 mm. Because of the proportional relationship between pixels and distance There is an error, assuming that the error is 1%, then the actual position here is 2 mm, then the error caused by the conversion here is ≈0.02 mm.)

[0059] 2. The CNC machine tool moves the shooting equipment to a new photo point to take pictures. The coordinates of the new photo point = the coordinates of the photo point + the offset distance. At this time, when taking pictures, point A is only 0.02mm away from the center o...

Embodiment 2

[0061] 1. First set the camera position, for example, X=10, Y=10

[0062] 2. According to the coordinates X and Y of the system preset shooting position, move the camera to the position set in step 1. After taking a picture, the offset of the feature point is X=200 pixels, Y=300 pixels. Assume that the proportional relationship between pixels and distance is 100 pixels = 1 mm. Then the actual position of this feature point X=12, Y=13

[0063] Because there is an error in the proportional relationship between the pixel and the distance, it is assumed that the actual proportional relationship is 99 pixels = 1 mm. At this time, the actual position of the feature point is X=12.02, Y=13.03

[0064] 3. If you directly use the position in the above step 2 as the actual point position at this time, then the X error here is 0.02, and the Y error is 0.03. If the machine tool is transported to the position of X=12 and Y=13 at this time, go to Take a picture, at this time you can get ...

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Abstract

The invention relates to a method for visual positioning calibration and a corresponding numerical control machining method. According to the method for visual positioning calibration, when a preset shooting position of a system is acquired, the deviation pixel of a feature point is obtained, and the feature parameter is converted into the deviation distance; the deviation distance is adjusted through the preset shooting position of the system, little deviation is achieved, visual positioning calibration is achieved, and therefore calibration of the numerical control system is achieved; and the machining progress can be effectively improved through the numerical control machining method adopting the method for visual positioning calibration, and errors can be reduced. According to the method for visual positioning calibration and the corresponding numerical control machining method, operation is easy and convenient, implementation is easy, and the deviation can be effectively reduced.

Description

technical field [0001] The invention relates to the field of numerical control machine tool systems, in particular to the field of visual coordinate positioning, and specifically refers to a method for visual positioning calibration and a corresponding numerical control machining method. Background technique [0002] At present, in CNC machining, the machining accuracy requirements are getting higher and higher. During processing, due to the deviation of product placement, the visual positioning system can be used at this time to take pictures of the product to be processed before processing, and obtain the rotation and offset of the product to be processed according to image recognition, and re-determine the coordinate system for the product to be processed. [0003] But there are following problems in this positioning mode in the prior art: [0004] The unit of visual algorithm is pixel, and the unit of movement is distance; therefore, before machine tool processing, it i...

Claims

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Application Information

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IPC IPC(8): B23Q17/24B23Q17/22
CPCB23Q17/2409B23Q17/2428
Inventor 秦锦生
Owner SHANGHAI WEIHONG ELECTRONICS TECH
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