A pipe profile detection method based on three installation points

A shape detection and installation point technology, applied in the direction of measuring devices, instruments, etc., can solve the problem of not truly reflecting the installation angle deviation of the pipe fittings, the gap between the seams, etc., to improve quality reliability and credibility, reduce production costs, reduce The effect of misjudgment

Active Publication Date: 2018-08-24
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, no matter whether the "best fitting method" or the "single-end positioning method" is used to detect the pipe fittings, it does not truly reflect the installation angle deviation of the pipe fittings and the gap between the joints.

Method used

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  • A pipe profile detection method based on three installation points
  • A pipe profile detection method based on three installation points
  • A pipe profile detection method based on three installation points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for detecting the shape of a pipe fitting based on three installation points includes a positioning method based on the three installation points, a deviation calculation method and detection requirements. The positioning method based on three installation points includes three installation points and a space positioning method. The three installation points refer to three points closely related to the installation location: the two end points PE of the pipe fitting, and the bending tangent point PTmax of the maximum Lmax on the line connecting the two end points PE. The space positioning method includes three steps: the first step is to determine the space triangle S from the three installation points of the theoretical pipe fittings, and determine the center of gravity G of the triangle S; the second step is to determine the same three installation points of the measured pipe fittings Determine the space triangle S1, and determine the center of gravity G1 of ...

Embodiment 2

[0054] On the basis of Example 1, for a 90°bending pipe fitting, the straight sections at both ends are 100mm and 50mm respectively, and the space coordinates of points on the centerline of the theoretical pipe fitting are T1 (0,100,0), T2 (150,100,0), T3 (200,50,0), T4 (200,0,0), the installation requires an angular deviation of ±3°, and an installation axial clearance of 0.5mm. When measuring the pipe fittings to be tested, the accuracy of the selected measuring equipment is at least 0.5 / 3=0.167mm, and the actual laser vector measuring equipment has an accuracy of 0.001mm, which can be used to measure pipe fittings. The actual measurement coordinates of the points on the centerline of the tested pipe fittings are P1 (0.800, 59.600, 125.000), P2 (90.061, 14.970, 125.000), P3 (112.021, -52.889, 125.000), P4 (88.650, -97.65, 125.000) ).

[0055] Calculation process: use computer calculation, the calculation accuracy is at least 0.5 / 100=0.005mm, the actual choice is 0.001mm. T...

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Abstract

The invention relates to the field of pipe profile detection and especially relates to a pipe profile detection method based on three installation points. The method comprises a positioning method based on the three installation points, a deviation calculating method and detection requirements, wherein the positioning method based on the three installation points comprises the three installation points and a space positioning method, the three installation points being three points closely related to installation position: two end points PE of a pipe and a bending tangent point PTmax, the distance Lmax between which and a connection line of the two end points PE is maximum. According to pipe installation requirements, axial deviation and angle deviation of the pipe are accurately detected,thereby ensuring meeting installation technical requirements, preventing the phenomenon that a qualified pipe cannot meet installation requirements caused through a best-fit method, and improving quality reliability and credibility.

Description

technical field [0001] The invention relates to the field of pipe fitting shape detection, in particular to a pipe fitting shape detection method based on three installation points. technical background [0002] In the past ten years, driven by foreign digital manufacturing technology, the digital manufacturing technology of pipe fittings for domestic aircraft, engines, ships, automobiles and industrial equipment has developed rapidly. All walks of life have begun to apply it. With the existing CNC pipe bending machine and laser vector measuring machine, digital manufacturing of pipe fittings has been realized, which not only greatly shortens the process preparation time, but also optimizes process parameters and improves product quality. [0003] At present, when inspecting the shape of pipe fittings, first determine the positioning reference of the tested pipe fitting 1, then measure the shape, compare the shape of the tested pipe fitting with the theoretical pipe fitting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/20
CPCG01B21/20
Inventor 李光俊
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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