A method for interlayer laser-modified laser selective melting to form gradient materials

A laser selective melting and gradient material technology, applied in additive processing, process efficiency improvement, additive manufacturing, etc., can solve problems such as micro-cracks and voids, and achieve higher density, higher surface quality, and elimination of voids. Effect

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Solve defects such as cavities, microcracks and surface protrusions in the laser selective melting process, and achieve parts with different performance gradients when using a single material for laser selective melting

Method used

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  • A method for interlayer laser-modified laser selective melting to form gradient materials
  • A method for interlayer laser-modified laser selective melting to form gradient materials
  • A method for interlayer laser-modified laser selective melting to form gradient materials

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Embodiment Construction

[0035] The typical feature of SLM technology is layered superposition manufacturing, with the thickness of each layer being 20-50 μm, which provides the possibility to change the properties of parts in the micron range. Combining the characteristics of laser surface modification technology to change the properties of surface materials and the characteristics of laser selective melting technology for micron-level layered superposition manufacturing, a new type of gradient material with different properties can be obtained by changing the process parameters of the two. With the development of science and technology, complex environments have higher and higher requirements for functional parts. In order to realize SLM printing of metal parts with special functions and special requirements, a device based on interlayer laser modification technology for laser selective melting to form gradient materials And methods will surely bring new innovations and breakthroughs. Laser modifica...

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Abstract

The invention discloses a method for interlayer laser modification of laser selective melting to form gradient materials; the laser surface modification process is integrated with the laser selective melting process, and the laser beam is re-scanned after each laser selective melting to form a certain number of layers. Laser modification of molded parts is used to change the microstructure and performance of different regions of the part, so as to obtain high-performance parts with different performance gradients. At the same time, through the re-scanning of the laser beam, defects such as voids, micro-cracks, and surface protrusions in the layer can be eliminated, and the density and surface quality of the molded parts can be improved. Changes in part organization and performance can be achieved by adjusting the set number of layers, laser rescanning power, laser beam scanning speed, and laser beam scanning spacing. Therefore, while improving the density of the molded parts, the present invention realizes the direct molding of multi-performance graded materials by laser selective melting technology, which plays an important role in promoting the development of industrial technology.

Description

technical field [0001] The invention relates to the field of laser selective melting molding, in particular to a method for interlayer laser modified laser selective melting forming gradient materials. Background technique [0002] The traditional laser modification technology mainly changes the properties of the surface of the part, so as to obtain parts that meet certain requirements. Although it can meet some industrial needs, it cannot be changed because it only changes the properties of a thin layer of material on the surface of the part. Due to the nature of the material inside the part, the scope of application is severely limited. [0003] Laser selective melting (SLM) forming technology is a kind of additive manufacturing technology and the latest development technology of rapid prototyping technology. This technology is based on the principle of layer-by-layer accumulation of discrete materials, and according to the three-dimensional data of digital parts designed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F3/24B33Y10/00B33Y40/20B33Y50/00
CPCB22F3/24B33Y10/00B33Y40/00B33Y50/00B22F2003/248B22F10/00B22F10/364B22F10/36B22F10/28B22F10/366B22F10/50Y02P10/25
Inventor 杨永强白玉超张明康肖泽锋陈杰
Owner SOUTH CHINA UNIV OF TECH
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