Defect detection device and detection and repair method in laser metal cladding rapid prototyping process

A technology for forming process and defect detection, applied in the direction of measuring device, optical radiation measurement, radiation pyrometry, etc., can solve the problems of metal parts fatigue fracture, catastrophic consequences, depth cannot be measured, etc., and achieve the effect of good reference value

Active Publication Date: 2019-12-24
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These non-penetrating defects create thick-walled parts where the depth cannot be measured and other repair techniques cannot be used
Once these defects lead to fatigue fracture of metal parts, it will have catastrophic consequences
For this defect, there is currently no effective online detection and online repair method

Method used

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  • Defect detection device and detection and repair method in laser metal cladding rapid prototyping process
  • Defect detection device and detection and repair method in laser metal cladding rapid prototyping process
  • Defect detection device and detection and repair method in laser metal cladding rapid prototyping process

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Embodiment Construction

[0034] The present invention is described in further detail below in conjunction with accompanying drawing:

[0035] see Figure 1-7 , the defect detection device in the laser metal cladding rapid prototyping process of the present invention includes a base plate 1 for placing a molded part 2, and a spray head 4 located above the base plate 1, a clamp 6 is installed on the print head 4, and can rotate, and the clamp 6 An infrared monochromatic pyrometer 5 is installed on it; the outer side of the molded part 2 is provided with an induction coil 3 adapted to its contour shape. The spray head 4 is composed of a laser, a powder feeder and a cooling water device. The cross-sectional shape and size of the induction coil 3 are determined according to the shape of the molded part 2 . The cross-sectional shape of the induction coil 3 is circular or square. The induction coil 3 is made of a copper tube with an outer diameter of 3mm-10mm. After the coil is made, the inner surface is ...

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Abstract

The invention discloses a defect detection device and a detection and repair method used in the laser metal cladding rapid molding process. By means of an induction coil, the temperatures, except a molten pool, on the surfaces of formed parts are kept consistent; an infrared single-color pyrometer is fixed to a sprayer through a rotatable clamp, and the infrared single-color pyrometer is driven tochange through the movement of the sprayer. Through experiments, the infrared single-color pyrometer generates large fluctuation through a defective method, principal component analysis is carried out on fluctuation curves, main factors influencing defects are obtained, clustering analysis is carried out on the main factors, and corresponding defect types are obtained. After the defect types areknown, defect positioning coordinates are found according to the distance between sprayers in a scanning path. Then, the purpose of eliminating the defects through grinding or re-melting is achieved.

Description

technical field [0001] The invention belongs to the field of laser metal additive manufacturing, and relates to a defect detection device and a detection and repair method in the rapid prototyping process of laser metal cladding. Background technique [0002] Laser metal cladding rapid prototyping is also called laser direct prototyping. Since its appearance in the early 1990s, due to the advantages of no pollution and the metallurgical combination of the prepared coating and the substrate, it has become a research hotspot in the surface modification of contemporary materials. The industrial field has a good application prospect. During the metal cladding process, an ultra-high temperature gradient is formed between the molten pool and the substrate. Under the ultra-high cooling rate, the molten pool solidifies instantly, and the surrounding protective gas cools rapidly, resulting in a large temperature difference in the molten pool plane. This greater temperature differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10G01J5/00
CPCC23C24/103G01J5/004
Inventor 崔滨吴垠李涤尘解瑞东曹毅同治强
Owner XI AN JIAOTONG UNIV
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