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Extraction and analysis method and device for section contour line of special-shaped workpiece

A special-shaped workpiece and analysis method technology, applied in measurement devices, image analysis, using optical devices, etc., can solve the problems of unverifiable machining accuracy, hidden dangers in application, and inability to perform measurement, so as to reduce the amount of data, avoid inaccuracy, The effect of eliminating human error

Active Publication Date: 2021-09-28
HUNAN GUOTIAN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the structural parts of the product are processed, the traditional method of measuring the external dimensions of the product is usually manual measurement. For structural parts with regular shapes, manual measurement can basically meet the measurement accuracy requirements, but for special-shaped components, due to the irregular surface shape, manual measurement often cannot. To achieve accurate measurement purposes, even due to the special structure, the measurement tools are not accessible and cannot be measured, resulting in unverifiable processing accuracy and causing hidden dangers for future applications

Method used

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  • Extraction and analysis method and device for section contour line of special-shaped workpiece
  • Extraction and analysis method and device for section contour line of special-shaped workpiece
  • Extraction and analysis method and device for section contour line of special-shaped workpiece

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Experimental program
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Effect test

Embodiment 1

[0080] Such as figure 1 As shown, a method for extracting and analyzing the profile of a special-shaped workpiece section provided in this embodiment includes the following steps:

[0081] S1: Pretreatment of the surface of the workpiece to be measured, the mirror material with strong reflection can be properly sprayed to reduce the output of noise, mark the measured target point on the contour line of the workpiece section, and determine the position P of the laser scanner 0 The coordinates (x 0 ,y 0 ,z 0 ) and the position P of the measured target point i The coordinates (x i ,y i ,z i ), there are n measured target points on the contour line of the workpiece section, i=1,2,...,n;

[0082] S2: Use a laser scanner to automatically scan and collect data from multiple angles of the workpiece to be measured, and obtain the three-dimensional scattered point data of n measured target points on the cross-sectional surface of the workpiece, as well as n points on the cross-se...

Embodiment 2

[0110] The difference between this embodiment and Embodiment 1 or Embodiment 2 is that before the data boundary fitting and data splicing using the least squares method in step S3, the boundary endpoints of the fitted sphere formed by the measured target points are constructed. The method for judging whether it is a boundary triangle includes the following steps:

[0111] M1: Use a triangle with the smallest circumscribed empty circle with a radius r formed by any three points on the fitted sphere center cross-section circle with parameters a, b, c and d to calculate the side length l and semiperimeter s of the triangle :

[0112]

[0113]

[0114] Among them, (x 1 ,y 1 ,z 1 ) and (x 2 ,y 2 ,z 2 ) is the three-dimensional coordinates of any two points in the triangle;

[0115] M2: Use Heron's formula to calculate the triangle area S formed by any three points on the cross-sectional circle of the center of the fitting sphere:

[0116]

[0117] M3: According to ...

Embodiment 3

[0121] like figure 2 As shown, the difference between this embodiment and embodiment 2 is only the position P of the laser scanner in the S1 step 0 Coordinates (x 0 ,y 0 ,z 0 )Calculated as follows:

[0122] x 0 =W×cosθ

[0123] x 0 =W×sinθ

[0124] z 0 =H

[0125] Among them, W is the radius of the light source center of the laser scanner equipment relative to the origin of the center of the orbit around the scanner, H is the height of the light source center of the laser scanner equipment relative to the flat base plane of the scanning area, θ is the center of the light source of the laser scanner equipment along the scanner Instantaneous angle during orbital motion;

[0126] The position coordinates of the measured target point (x i ,y i ,z i ) is calculated as follows:

[0127] x i =(W-D×sinβ)×cosθ;

[0128] the y i =(W-D×sinβ)×sinθ;

[0129] z i =H-D×cosβ;

[0130] Among them, D is the distance between the center of the light source of the laser scann...

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Abstract

The invention provides an extraction and analysis method and device for a section contour line of a special-shaped workpiece. The method comprises the following steps: preprocessing the surface of a to-be-measured workpiece, marking a measured target point on the section contour line of the workpiece, and determining the position coordinates of a laser scanner and the measured target point; performing automatic scanning and data acquisition by adopting a laser scanner and performing target point calibration; carrying out data boundary fitting and data splicing by adopting a least square method, and carrying out secondary processing to obtain complete three-dimensional coordinate information of the surface of the measured target; substituting sectioning parameters according to requirements, segmenting all coordinate scatter points, reducing data density by adopting a KNN-D algorithm, calculating an optimal section path, and extracting section contour line sequence node coordinates; and outputting section statistical characteristic parameters, and further outputting a section contour line. According to the method and the device provided by the invention, the purpose of full-process intelligent rapid measurement of the special-shaped part is well achieved, high-degree automation can be realized, and the purpose of saving a large amount of manual measurement cost is achieved.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous workpiece measurement, and in particular relates to a method and device for extracting and analyzing the contour line of a heterogeneous workpiece section. Background technique [0002] After the structural parts of the product are processed, the traditional method of measuring the external dimensions of the product is usually manual measurement. For structural parts with regular shapes, manual measurement can basically meet the measurement accuracy requirements, but for special-shaped components, due to the irregular surface shape, manual measurement often cannot. To achieve the purpose of accurate measurement, even due to the special structure, the measurement tool is inaccessible and cannot be measured, resulting in unverifiable machining accuracy and causing hidden dangers for future applications. [0003] Therefore, it is a problem faced by many enterprises to accurately and efficiently...

Claims

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Application Information

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IPC IPC(8): G06T7/13G06T7/62G06T17/00G06T7/00G06T5/00G06F17/16G01B11/24
CPCG06T7/13G06T7/62G06T7/0004G06T17/00G01B11/24G06F17/16G06T5/80G06T5/70
Inventor 吕冰冰周天罗伟何畅
Owner HUNAN GUOTIAN ELECTRONICS TECH CO LTD
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