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Line structured light-based cast workpiece surface quality detection method and system thereof

A quality inspection method and technology on the surface of workpieces, applied in the direction of optical testing of flaws/defects, measuring devices, and material analysis through optical means, can solve problems such as incomplete inspection, inability to quantify, and low efficiency of manual inspection, and achieve overcoming efficiency low effect

Inactive Publication Date: 2017-06-20
WUHAN UNIV OF TECH
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Problems solved by technology

Manual detection has problems such as low efficiency, incomplete detection, and inability to quantify

Method used

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  • Line structured light-based cast workpiece surface quality detection method and system thereof
  • Line structured light-based cast workpiece surface quality detection method and system thereof
  • Line structured light-based cast workpiece surface quality detection method and system thereof

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Embodiment Construction

[0026] The method for detecting the surface quality of casting workpieces based on the line structured light of the present invention is mainly divided into two parts: the detection part of the lower computer and the analysis and comparison parts of the upper computer. The overall workflow is as figure 1 , Including the following steps:

[0027] 1) The workpiece enters the rotating scanning table from the conveyor belt, and the workpiece returns to the conveyor belt to leave after one revolution on the table;

[0028] 2) The lower computer sends the 3D point cloud data obtained in step 1) to the upper computer, and the upper computer filters the point cloud data to remove high-frequency noise;

[0029] 3) The filtered data is processed at the same time in two analysis methods: surface contour analysis and 3D model similarity analysis; two methods are used to find out the problematic parts of the workpiece and choose to mark defects or directly calculate the degree of defects;

[0030]...

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Abstract

The invention discloses a line structured light-based cast workpiece surface quality detection method and a system thereof. The method comprises the following steps: scanning a workpiece by using line-structured lights and an imaging unit to obtain three-dimensional point cloud of the workpiece, slicing the original three-dimensional model of the workpiece and carrying out planar vectorization on the three-dimensional point cloud of the workpiece to obtain three-dimensional contour data of the original three-dimensional model and the workpiece to be detected, carrying out rotating, movement, fitting pre-estimation and other operations on the obtained three-dimensional contour data, calculating the similarity layer by layer, marking a part with low similarity, and calculating the integral similarity of the original three-dimensional model and the workpiece to be detected. Compared with the prior art, the method disclosed in the invention can be used to detect the problems of cast workpieces through an automatic and quantified flawless detection technology, and solves the problems of low efficiency, incomplete detection and unable quantification of manual detection.

Description

Background technique [0001] With the continuous improvement of the intelligent level of the manufacturing industry, higher and higher requirements are put forward for the accuracy, efficiency and automation of object measurement methods. Casting workpieces have a high rate of residual and waste products, especially on the surface of casting workpieces, which often have defects such as sand inclusions, sand holes, slag holes, shrinkage holes, lack of meat, and sarcomas. Manual detection has problems such as low efficiency, incomplete detection, and inability to quantify. Summary of the invention [0002] In order to solve the above technical problems, the present invention provides a method and system for detecting the surface quality of casting workpieces based on line structured light, which can detect the problems of casting workpieces in an automated and quantifiable method. [0003] To solve the above technical problems, the present invention adopts the following technical sol...

Claims

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Application Information

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IPC IPC(8): G01N21/88
CPCG01N21/8851G01N2021/8854G01N2021/8874G01N2021/888
Inventor 胡剑王刚李家靖苏童
Owner WUHAN UNIV OF TECH
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