A real-time elimination method of laser powder bed melting near-surface forming defects

A laser powder and laser remelting technology, applied in the field of additive manufacturing, can solve the problems of incomplete elimination of forming defects, increase of forming time and cost, etc., achieve sufficient response time, timely elimination of pore defects, and reduce surface roughness.

Active Publication Date: 2022-07-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in some special cases, post-processing not only cannot completely eliminate forming defects, but also adds additional forming time and cost

Method used

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  • A real-time elimination method of laser powder bed melting near-surface forming defects
  • A real-time elimination method of laser powder bed melting near-surface forming defects
  • A real-time elimination method of laser powder bed melting near-surface forming defects

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Effect test

Embodiment 1

[0053] The present embodiment provides a real-time elimination method for laser powder bed melting near-surface forming defects, and the specific implementation steps are as follows:

[0054] Step 1: Monitor the distance h between the laser powder bed fusion forming defect and the surface of the deposition layer in real time through an external acquisition system;

[0055] Step 2: Determine the location of the defect according to the distance h between the forming defect and the surface of the deposition layer. The specific steps are as follows:

[0056] 1) When h>N thicknesses of deposited layers, laser remelting is carried out immediately, and the defect elimination of the deposited layer after remelting is judged. If the defect elimination meets the requirements, powder spreading and laser powder bed melting are performed; otherwise, optimization is performed. The remelting process performs laser remelting again until the defects are eliminated and the requirements are met;...

Embodiment 2

[0067] The present embodiment provides a real-time elimination method for laser powder bed melting near-surface forming defects, and the specific implementation steps are as follows:

[0068] Step 1: Monitor the distance h between the laser powder bed fusion forming defect and the surface of the deposition layer in real time through an external acquisition system;

[0069] Step 2: Determine the location of the defect according to the distance h between the forming defect and the surface of the deposition layer. The specific steps are as follows:

[0070] 1) When h>N thicknesses of deposited layers, laser remelting is carried out immediately, and the defect elimination of the deposited layer after remelting is judged. If the defect elimination meets the requirements, powder spreading and laser powder bed melting are performed; otherwise, optimization is performed. The remelting process performs laser remelting again until the defects are eliminated and the requirements are met;...

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Abstract

The invention proposes a real-time elimination method of laser powder bed melting near-surface forming defects. First, the distance h between the laser powder bed melting and forming defects and the surface of the deposition layer is monitored in real time through an external acquisition system; then the position of the defect is determined, and when h > When the thickness of N deposition layers is reached, laser remelting is performed immediately; when h≤N thicknesses of deposition layers, powder spreading and laser powder bed melting are performed, and so on and so forth until the cumulative printing height H reaches the specified height, and the surface of the deposition layer is re-melted. Perform laser remelting. Compared with the existing forming technology, the present invention can not only reduce the surface roughness of the formed part, but also realize the timely elimination of pore defects. The forming efficiency is greatly improved, and at the same time, a more abundant response time is obtained for the online feedback adjustment of defects.

Description

Technical field: [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a real-time elimination method of laser powder bed melting near-surface forming defects. Background technique: [0002] Additive manufacturing is an advanced rapid prototyping technology that achieves near-net-shape formation of complex parts by layer-by-layer deposition through computer-aided techniques. Compared with traditional manufacturing technology, additive manufacturing technology effectively improves forming efficiency and material utilization, and is expected to achieve free manufacturing. Laser Powder Bed Fusion (LPBF) is a typical metal 3D printing technology, which uses a high-energy laser beam to directly melt metal powder, and the formed parts have excellent mechanical properties and dimensional accuracy. However, the laser powder bed fusion forming process is extremely complex and under extreme conditions, and it is easy to form manuf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/28B22F10/85B22F10/364B33Y10/00B33Y50/02B33Y40/20
CPCB22F3/24B33Y30/00B33Y50/02B33Y40/20Y02P10/25
Inventor 刘婷婷张玲廖文和韦辉亮曹洋
Owner NANJING UNIV OF SCI & TECH
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