A detection method for the shape of pipe fittings based on three installation points

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

Active Publication Date: 2020-02-18
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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 detection method for the shape of pipe fittings based on three installation points
  • A detection method for the shape of pipe fittings based on three installation points
  • A detection method for the shape of pipe fittings based on three installation points

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Embodiment 1

[0050] A pipe fitting shape detection method based on three installation points includes a positioning method based on three installation points, a deviation calculation method and detection requirements. The positioning method based on three installation points includes three installation points and a spatial positioning method. The three installation points refer to three points closely related to the installation position: the two end points PE of the pipe fitting, and the bending tangent point PTmax of the maximum Lmax connecting the two end points PE. The spatial positioning method includes three steps: the first step is to determine the spatial triangle S from the three installation points of the theoretical pipe fitting, and the center of gravity G of the triangle S is determined; the second step is to use the same three installation points of the measured pipe fitting Determine the spatial triangle S1, and determine the center of gravity G1 of the triangle S; the third ...

Embodiment 2

[0055] On the basis of Example 1, for a certain 90° bending pipe, the straight sections at both ends are 100mm and 50mm respectively, and the spatial coordinates of the points on the center line of the theoretical pipe 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 the installation axial clearance is 0.5mm. When measuring the pipe to be tested, the accuracy of the measuring equipment should be at least 0.5 / 3=0.167mm. The actual laser vector measuring equipment has an accuracy of 0.001mm, which can be used to measure pipes. The actual measurement coordinates of the points on the center line of the tested pipe 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) ).

[0056] Calculation process: Use computer to calculate, the calculation accuracy is at least 0.5 / 100=0.005mm, the actual choice is 0.001mm. The straight line distance between T2 p...

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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. [0002] technical background [0003] In the past ten years, driven by foreign digital manufacturing technology, the digital manufacturing technology of domestic aircraft, engines, ships, automobiles, and industrial equipment has developed rapidly. Manufacturing-oriented three-dimensional rapid modeling technology and CNC bending process modeling technology have begun to develop All walks of life began to apply, with the existing CNC pipe bender, laser vector measuring machine, realized the digital manufacturing of pipe fittings, not only greatly shortened the process preparation time, but also optimized process parameters and improved product quality. [0004] At present, in the pipe fitting shape inspection, the positioning datum of the tested pipe fitting 1 is determined first, and then the shape is m...

Claims

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Application Information

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