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Detection and repair method and device for 3D printing pore defects

A technology of 3D printing and repairing method, 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 printing pass rate

Active Publication Date: 2021-12-03
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 and device for 3D printing pore defects

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the process of the SLM printing casting, in order to realize the repair of the pore defect of the SLM printing casting, the embodiment of the present application provides a method for detecting and repairing the 3D printing pore defect, 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, 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 are obtained; the infrared image of the molten pool is an 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 calculation formula for judging abnormality of the size of the molten pool and the formula for judging abnormality of the tem...

Embodiment 2

[0066] Based on the method for detecting and repairing 3D printing pore defects in Embodiment 1, this embodiment of the application provides a device for detecting and repairing 3D printing defects, including: a laser component, a printing platform, a high-speed camera, an infrared camera, a CT machine, and a control system The laser component, 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 component is used to melt the printing layer and the ablation of the defect area; the printing platform is used to set up the printed part; the high-speed camera is used to collect the splash image of the i-th layer and the surface image of the i-th layer; the infrared camera is used to Collecting the infrared image of the molten pool of the i-th layer; the CT machine is used to collect the pore image of the repaired area; The infrared image and the pore im...

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Abstract

The invention relates to a detection and repair method and device for 3D printing pore defects. The method comprises the following steps of (1) conducting defect detection on an ith layer to determine a defect area; (2) determining the defect type of the defect area according to an image of the ith layer of defect area; (3) determining a defect repair mode according to the defect type, repairing the defect area and marking the defect area as a repair area; (4) conducting pore detection on the repair area of the ith layer; (5) determining the porosity of the repair area according to the pore volume and the volume of the repair area; and (6) determining whether a pore defect exists or not according to the porosity of the repaired area, and repairing. According to the method, the defect type and the defect area are determined layer by layer through image detection, and the pore defect of the repair area is detected and repaired, so that qualified repair of the repair area is realized, and the percent of pass of the mechanical property of a casting is improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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