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A Visual Detection Method of Cladding Pool Shape Based on Serial Contour Search

A visual inspection and cladding pool technology, applied in image analysis, image enhancement, instruments, etc., can solve problems such as time-consuming and labor-intensive, affect the quality of processed parts, and cannot meet the automatic evaluation of metal 3D printing quality, etc.

Active Publication Date: 2021-07-02
NANJING NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The quality of laser cladding directly affects the quality of processed parts. At present, the quality of laser cladding such as metal 3D printing depends on experienced workers to monitor the whole process and adjust process parameters in time. In good health, unable to meet the requirements for automatic evaluation of metal 3D printing quality

Method used

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  • A Visual Detection Method of Cladding Pool Shape Based on Serial Contour Search
  • A Visual Detection Method of Cladding Pool Shape Based on Serial Contour Search
  • A Visual Detection Method of Cladding Pool Shape Based on Serial Contour Search

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Embodiment

[0090] In this embodiment, the cladding pool shape detection method applied to metal 3D printing and laser cladding is used to verify the cladding pool shape visual detection method based on serial contour search. First, a high-speed industrial camera is used to collect the video of the metal 3D printing cladding pool, Extract a single-frame cladding pool color image from the video; then, perform grayscale transformation, grayscale inversion, and grayscale stretching on the extracted single-frame cladding pool color image; secondly, use the local difference operator to filter the mean Edge extraction is performed on the image of the cladding pool, followed by dilation and erosion processing, the area with the largest area is retained, and other areas are eliminated; finally, the binary image of the cladding pool area is serially searched for contours to obtain the binary contour image of the cladding pool area , to complete the visual inspection of the shape of the cladding poo...

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Abstract

The invention discloses a method for visually detecting the shape of a cladding pool based on serial contour search. The method uses a high-speed industrial camera to collect a video of a metal three-dimensional printing cladding pool, and extracts a single-frame cladding pool color image from the video; for the extracted Grayscale transformation, grayscale inversion and grayscale stretching are performed on the color image of the single-frame cladding pool; edge extraction is performed on the mean-filtered image by using a local difference operator, and then dilated and corroded to retain the area with the largest area. Eliminate other areas; finally, perform serial contour search on the binary image of the cladding pool area to obtain the binary contour image of the cladding pool area, complete the visual detection of the cladding pool shape, and obtain the cladding pool shape in the metal 3D printing process. Provide basis for appearance analysis.

Description

technical field [0001] The invention belongs to the technical field of metal three-dimensional printing and image processing, and relates to a cladding pool shape visual detection method based on serial contour search. Background technique [0002] Nowadays, metal 3D printing and laser cladding are emerging metal special processing technologies, which use high-energy laser beams to irradiate the surface of the material (coating material and substrate) to be rapidly melted, expanded and rapidly solidified. The process of forming a metallurgical bonding layer with special properties such as wear resistance, corrosion resistance, and oxidation resistance on the surface of the material, thereby forming a high-quality alloy cladding layer with different properties. Laser cladding is an emerging stacking forming technology. The high-energy laser beam melts the metal or alloy powder extruded by the laser nozzle to form a molten pool on the surface of the substrate. The alloy powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/13G06T7/62
CPCG06T7/0004G06T2207/10016G06T2207/30136G06T7/13G06T7/62
Inventor 谢非杨继全刘益剑杨建飞施建平冯春梅汪璠陆飞莫志勇邱鑫
Owner NANJING NORMAL UNIVERSITY
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