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Detection and repair method of 3D printing pore defects

A 3D printing and repair method technology, applied in the direction of process efficiency improvement, additive manufacturing, additive processing, etc., can solve the problems of detection, failure to pass the mechanical properties of castings, etc., and achieve the effect of improving the pass rate of printing

Active Publication Date: 2022-07-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the surface, the casting has completed the printing process normally, but in fact, what is obtained is a casting with a large number of internal porosity defects, and it cannot pass the mechanical property test of the casting

Method used

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  • Detection and repair method of 3D printing pore defects

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the process of SLM printing casting, in order to realize the repair of pore defects in the SLM printing casting, the embodiment of the present application provides a method for detecting and repairing 3D printing pore defects, such as figure 1 shown, including the following steps:

[0026] S10, perform defect detection on the i-th layer to determine the defect area;

[0027] Further, obtain the infrared image of the molten pool of the i-th layer, the splash image of the i-th layer of droplets and the surface image of the i-th layer; the infrared image of the molten pool is the infrared image of the laser melting area of ​​the i-th layer; the droplet The splash image is a high frame rate image of the i-th layer; the surface image is an image of the i-th layer after laser cladding is completed.

[0028] Further, according to the abnormality judgment calculation formula of the molten pool size and the abnormality judgment formula of the molten pool temperature, determi...

Embodiment 2

[0066] Based on the method for detecting and repairing 3D printing pore defects in the first embodiment, the embodiment of the present application provides a 3D printing defect detection and repairing device, including: a laser component, a printing platform, a high-speed camera, an infrared camera, a CT machine, and a control system ; The laser assembly, the high-speed camera, the infrared camera and the CT machine are assembled above the plane where the printing platform is located and communicated with the control system; the laser assembly is used for melting the printing layer and the Ablation of defect areas; the printing platform is used to set up the printed part; the high-speed camera is used to collect the droplet splash image of the i-th layer and the surface image of the i-th layer; the infrared camera is used to Collect the infrared image of the molten pool of the i-th layer; the CT machine is used for collecting the pore image of the repaired area; the control sys...

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Abstract

This application relates to a method for detecting and repairing 3D printing pore defects. It includes the following steps: (1) performing defect detection on the i-th layer to determine the defect area; (2) determining the defect type of the defect area according to the image of the defect area in the i-th layer; (3) determining the defect type according to the defect type Defect repair method, repair the defect area and mark it as repair area; (4) perform pore detection on the repair area of ​​the i-th layer; (5) determine the repair area according to the pore volume and the repair area volume (6) According to the porosity of the repaired area, determine whether there is a pore defect and repair it. The defect type and the defect area are determined layer by layer through image inspection, and the pore defect in the repair area is detected and repaired, so as to realize the qualified repair of the repair area and improve the qualified rate of mechanical properties of the casting.

Description

technical field [0001] The present application relates to the technical field of computer vision and industrial automation detection, and in particular, to a method for detecting and repairing 3D printing pore defects. Background technique [0002] In the prior art, selective laser melting technology (ie, SLM) is widely used in 3D printing of metal castings. The SLM manufactures three-dimensional castings by laying metal powder layer by layer according to the structural characteristics of the casting, melting the metal powder in a selected area by a laser beam, and performing condensation molding and layer-by-layer stacking. The SLM is widely used in the fields of aerospace, medical equipment and its implants, molds, and automobiles due to its ability to integrally form complex and fine structures. [0003] At present, the castings manufactured by the SLM technology have rough surfaces, internal pores and abnormal contours, which will adversely affect the mechanical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/28B22F10/50B22F12/90B22F10/85B33Y10/00B33Y30/00B33Y50/02
CPCB22F10/28B22F10/50B22F12/90B22F10/85B33Y10/00B33Y30/00B33Y50/02Y02P10/25
Inventor 杨洋王成勇文琢陈孟刘建业戚文军
Owner GUANGDONG UNIV OF TECH