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 comp

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

Examples

Experimental program
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Effect test

Example Embodiment

[0079] Example 1

[0080] like figure 1 As shown, the extraction and analysis method of cross-sectional profile line provided in this embodiment, including the steps of:

[0081] S1: The surface pretreatment of the workpiece to be measured, the mirror material of the reflection can be properly sprayed to reduce the output of noise, and mark the workpiece section contour, determine the position P of the laser scanner. 0 Coordinate (X 0 Y 0 ,z 0 ) And the position of the target point i Coordinate (X i Y i ,z i ), There are N-measured target points on the outline of the workpiece section, i = 1, 2, ..., n;

[0082] S2: The automatic scanning and data acquisition of the workpiece is taken from multiple angles to obtain the three-dimensional scatter data of the workpiece section surface of the workpiece section, and N angles N angle acquired workpiece section N The N point cloud fragment formed by the measured target point, and targets the three-dimensional base data obtained by the ob...

Example Embodiment

[0109] Example 2

[0110] This embodiment is composed of the boundary end of the fitting sphere composed of the measured target point before the S3 step is used in the S3 step to perform the fitting and data splicing of the data boundary. Whether to determine the boundary triangle, including the following steps:

[0111] M1: The minimum external empty circle having a radius R r is used in a triangular triangle having a radius R having an arbitrary three points composed of parameters A, B, C, and D, and calculates a triangular side length L and a half-week long S. :

[0112]

[0113]

[0114] Among them, (x 1 Y 1 ,z 1 ) And (x 2 Y 2 ,z 2 ) To form three-dimensional coordinate of any two points in the triangle;

[0115] M2: The triangular area S-formed triangular area formed by the Heron formula is calculated on any three points formed on the spheroid center cross section:

[0116]

[0117] M3: The triangular area S obtained according to the M2 step can obtain a triangular min...

Example Embodiment

[0120] Example 3

[0121] like figure 2 As shown, the difference between the present embodiment and the second embodiment is only the position P of the laser scanner in the S1 step. 0 Coordinate (X 0 Y 0 ,z 0 )Calculated as follows:

[0122] x 0 = W × cos θ

[0123] x 0 = W × sin θ

[0124] z 0 = H

[0125] Wherew is the radius of the laser scanner device light source center with respect to the scanner surrounding the center of the track, H is the height of the laser scanner device light source center with respect to the scanning area flat base plane, θ is the laser scanner equipment light source center edge scanner Instantaneous angle when surrounding the track is surrounded by the track;

[0126] Location coordinates for measurement target points (X i Y i ,z i The calculation formula is as follows:

[0127] x i = (W-D × SINβ) × COS θ;

[0128] y i = (W-D × SINβ) × sin θ;

[0129] z i = H-D × COSβ;

[0130] Among them, D is the distance between the center of the laser scanner dev...

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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
CPCG06T7/13G06T7/62G06T7/0004G06T5/002G06T5/006G06T17/00G01B11/24G06F17/16
Inventor 吕冰冰周天罗伟何畅
Owner HUNAN GUOTIAN ELECTRONICS TECH CO LTD
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