Selective laser melting preparation method of porous structure variable-density-gradient metal material

A laser selective melting, porous structure technology, applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve the problems of complex process, inflexible porosity controllability, etc., achieve high preparation efficiency, improve interface bonding Strength, the effect of meeting weight loss needs

Pending Publication Date: 2020-08-25
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

However, these preparation methods are complicated in process, require additional

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  • Selective laser melting preparation method of porous structure variable-density-gradient metal material
  • Selective laser melting preparation method of porous structure variable-density-gradient metal material

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Embodiment 1

[0023] A process for preparing a metal porous structure variable density gradient material by laser selective melting, comprising the following steps:

[0024] Step 1: Select TC4 titanium alloy as the raw material for laser selective melting and forming. The particle size range of TC4 powder is 15-53 μm, the sphericity is ≥90%, the fluidity is ≤38s / 50g, and the content of various chemical components: Al: 5.5-6.5%; V: 3.4-4.5%, Fe≤0.25%; H≤0.012%; C≤0.05%; O≤0.1%; Ti: balance.

[0025] Step 2: Use AutoCAD software to construct the required variable density gradient porous structure model, without additionally designing details such as pore distribution and pore size inside the structure, and the entire pore structure model is designed as a solid. Save it in STL format, use the Magics Materialize slicing software to slice the 3D model and import it into the laser selection melting forming equipment. The thickness of each slice is 0.02-0.04mm;

[0026] Step 3: Choose the model M...

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Abstract

The invention belongs to the field of additive manufacturing, and relates to a selective laser melting preparation method of a porous structure variable-density-gradient metal material. The method includes the steps that (1) metal spherical powder suitable for selective laser melting is selected as a raw material; (2) a required variable-density porous structure model is constructed by using three-dimensional modeling software, and it is noted that the structural model can be simplified as an entity without designing an extra hole structure; (3) the three-dimensional model is sliced through special software and then is guided into a selective laser melting forming device; (4) proper selective laser melting forming process parameters are set, wherein the laser scanning rate is increased along with the forming height; and (5) forming is completed, the porous structure and a substrate are subjected to annealing treatment together, and after annealing, the metal material is obtained through linear cutting, surface cleaning and sand blasting. The variable-density-gradient porous structure with the porosity gradiently ranging from over 99.9% to about 50% can be obtained only by adjustingthe laser scanning speed, a structural member has good surface quality and strength as a whole, and the light weight requirement of the structure can be met.

Description

technical field [0001] The invention relates to a metal laser selective melting preparation process, in particular to a laser selective melting preparation process for a metal porous structure variable density gradient material. Background technique [0002] Selective Laser Melting (SLM) is an advanced manufacturing technology that has been gradually developed in recent years. It uses high-energy-density laser beams to melt metal powder layer by layer and accumulate layer by layer to obtain near-net-shaped parts. . Compared with traditional forging, casting and welding manufacturing technologies, this technology can meet the manufacturing of complex structural parts of difficult-to-machine metals, ensure the dimensional accuracy of complex components, have high forming efficiency and excellent comprehensive mechanical properties, and can effectively solve the current It is difficult to process complex parts in high-tech fields such as aerospace. [0003] The pursuit of hig...

Claims

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Application Information

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IPC IPC(8): B22F3/11B22F3/24B33Y10/00B33Y40/20
CPCB22F3/1109B22F3/24B33Y10/00B33Y40/00B22F2003/248B22F2999/00B22F2207/11B22F10/28Y02P10/25
Inventor 闫泰起孙兵兵刘伟陈冰清雷杨
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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