A Method for Bend Pipe Measurement and Allowance Positioning Oriented to Digital Manufacturing

A positioning method and pipe bending technology, applied in the field of computer vision, can solve the problems of segmentation method analysis, failure to calculate the end point of the straight line segment and the center point of the arc segment, etc., so as to reduce the development cost, shorten the development time, and improve the product quality.

Active Publication Date: 2021-09-21
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Tang Zhengzong and others disclosed a bent pipe detection algorithm in the patent "a three-dimensional bent pipe multi-camera visual detection method and its system". The segmentation method of the arc segment is analyzed. Secondly, the elbow parameters are calculated in the disclosed algorithm, and the control point is obtained only by using the midpoint of the perpendicular line, and the end point of the straight line segment and the center point of the arc segment are not calculated.

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  • A Method for Bend Pipe Measurement and Allowance Positioning Oriented to Digital Manufacturing
  • A Method for Bend Pipe Measurement and Allowance Positioning Oriented to Digital Manufacturing
  • A Method for Bend Pipe Measurement and Allowance Positioning Oriented to Digital Manufacturing

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Embodiment Construction

[0052] The invention will be further described in detail below with reference to the accompanying drawings and examples.

[0053] like figure 1 As shown, the specific steps of the one-to-digital manufacturing elbow measurement and marga positioning method are as follows:

[0054] Step 1: Use a single laser tracker and a planar target for a global calibration to unify the coordinate system of different locations to the global coordinate system of the laser tracker;

[0055] Step 2: Synchronously trigger a plurality of visual sensors to collect the elbow image, using an edge detection algorithm to detect the edge detection of the elbow image, use the morphological refinement method to obtain the centerline of the elbow image, the branch on the centerline, use two-way extreme The line matching algorithm performs three-dimensional reconstruction of the centerline to obtain the centerline of the elbow space;

[0056] Morphological refinement obtains the skeleton of the elbow center, th...

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Abstract

The invention relates to a digital manufacturing-oriented bending pipe measurement and margin positioning method. The steps are: global calibration of multi-sensors with the help of laser tracker and target, the multi-sensor coordinate system is converted to the global coordinate system; multiple sensors strictly synchronously collect images of the bent pipe, edge detection and morphological refinement to obtain the shape of the bent pipe Centerline, 3D reconstruction of the centerline with the help of bidirectional epipolar matching algorithm; discretize the centerline into a spatial point cloud, calculate control points, endpoints of straight line segments, and arc center points of arc segments, and use the centerline as a guide line for 3D modeling ;Finally, use the nearest point iteration method to match the design model and the measurement model, calculate the margin position, and then realize the self-seeking cutting and welding of the elbow, and speed up the digital manufacturing process of the elbow.

Description

Technical field [0001] The present invention relates to the field of computer vision technology, specifically a balance measurement and elbow positioning method for digital manufacturing. Background technique [0002] Industrial piping systems in aviation, aerospace, automotive and other important lifeline, such as blood vessels, is responsible for the transmission medium of hydraulic, air, gas, etc., currently forming elbow measurement mainly contact, such as by molding , the presence of contrast device manufacturing difficulties, CMM, articulated coordinate measuring machine these methods, easy to damage or deform, low efficiency, excessive reliance on subjective judgment of the operator, and the model can not be reconstructed without defects such as a positioning reference. [0003] Advanced manufacturing technology is an effective means to transform the traditional manufacturing industry, now digital manufacturing technology is the core technology of advanced manufacturing te...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06T17/00G06T7/13G06T7/155G06T7/80
CPCG06T17/00G06T2207/10028G06T2207/20036G06T2207/30172
Inventor赵吉宾陈月玲夏仁波付生鹏
OwnerSHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI