High-density pure molybdenum selective laser melting producing method

A selective laser melting and densification technology, which is applied in the direction of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., can solve the problems of poor mechanical properties of parts, achieve high density, avoid machining and post-processing, and optimize the process The effect of the parameter

Inactive Publication Date: 2019-02-12
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using SLM technology to prepare pure molybdenum parts, its density is strongly affected by laser power, scanning speed and scanning distance, and often the molded parts contain a large number of shrinkage cavities and shrinkage porosity, resulting in poor mechanical properties of the parts

Method used

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preparation example Construction

[0033] A method for preparing high-density pure molybdenum by selective laser melting, the preparation process specifically includes the following steps:

[0034] (1) According to the shape of the pure molybdenum forming part to be processed, establish a three-dimensional model on the computer and output it as an STL format file. Input it into the 3D printing editing software, perform two-dimensional processing, and slice the model layeredly in the height direction. The slice data includes the contour information and processing path of the formed part, and import it into the selective laser melting equipment;

[0035] (2) Set the processing parameters of the pure molybdenum sample: the diameter of the laser spot is 75 μm, the laser power is 325 W, the scanning speed is 400 mm / s, the scanning distance is 60 μm, the cross hatching scanning strategy is adopted, and the laser scanning direction is rotated layer by layer 67 °, to minimize the overlapping of laser scanning vectors o...

Embodiment 1

[0047] A preparation method for selective laser melting of pure molybdenum with high surface quality, comprising the following steps:

[0048] (1) Model the three-dimensional solid model of the formed part through CAD software on the computer, then output the model in STL format, and then input it into the 3D printing editing software for two-dimensional processing.

[0049] (2) Import the gas-atomized spherical pure molybdenum powder into the feeding bin, the powder particle size is 13-53 μm, fix the forming substrate on the workbench of the selective laser melting equipment, close the bin door, and fill it with a purity of 99.9% after vacuuming. % argon as a shielding gas to ensure that the oxygen content in the forming chamber is ≤100ppm.

[0050] (3) Set different processing parameters, change the laser power and scanning speed, control the scanning distance to 60 μm in this preparation method, and adopt the Cross hatching scanning strategy. Start the selected area laser ...

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Abstract

The invention provides a high-density pure molybdenum selective laser melting producing method. The high-density pure molybdenum selective laser melting producing method comprises the following stepsof establishing a molybdenum plate three-dimensional solid numerical model on a computer; setting the power, scanning speed, scanning spacing and scanning mode of a laser beam; performing 3D printing;determining the density of different formed parts; and selecting the optimal process parameters. By optimizing the process parameters of SLM technology, the pure molybdenum formed parts with high density and high surface quality can be obtained, traditional machining and post-processing are avoided, manpower and material resources are saved, and the machining period is shortened. Pure molybdenumworkpieces produced according to the machining process have good mechanical properties at room temperature and technically have certain theoretical research value and practical application value.

Description

technical field [0001] The invention relates to a preparation method of selective laser melting, in particular to a preparation method of high-density pure molybdenum selective laser melting, which belongs to the metal rapid prototyping manufacturing technology. Background technique [0002] Selected area laser melting technology, referred to as SLM technology, is one of the main technologies for metal additive manufacturing. SLM forming technology is based on the idea of ​​layer-addition manufacturing, using high-energy laser beams to melt and solidify metal powder layer by layer, and form metal parts. The basic idea of ​​SLM technology is the same as other rapid prototyping technologies: first establish the 3D CAD model of the part, then output the 3D model as an STL format file, import it into the 3D printing editing software, and perform two-dimensional processing. The model is layered and sliced, and the sliced ​​data includes the contour information and processing pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/66B22F10/28B22F12/44B22F10/36B22F12/49B22F10/366B22F10/32B22F12/63B22F10/73Y02P10/25
Inventor 张贺新张驰赵成志庞红杨学凯李洪黄垚张慧
Owner HARBIN ENG UNIV
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