Selective laser sintering method for preparing zero-expansion/shrinkage-rate metal parts

A technology of laser selective sintering and metal parts, which is used in metal processing equipment, process efficiency improvement, additive manufacturing, etc., to achieve the effects of high hardness, good comprehensive mechanical properties, and high strength

Active Publication Date: 2016-10-12
四川三阳激光增材制造技术有限公司
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  • Selective laser sintering method for preparing zero-expansion/shrinkage-rate metal parts

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Embodiment Construction

[0024] Attached below figure 1 A laser selective sintering method for preparing a zero-expansion-shrinkage metal part of the present invention will be described in detail.

[0025] A laser selective area sintering method for preparing metal parts with zero expansion and shrinkage ratio, the method comprises the following steps:

[0026] 1) Metal parts with zero expansion and contraction ratio have a multi-phase alloy structure, in which the Sn-Bi alloy phase is a low-melting alloy phase, and its eutectic point is located at 42% Sn and 58% Bi components, and the eutectic temperature is 138°C , it shrinks when heated at -30-138°C and expands when cooled, while the alloy phases other than Sn-Bi alloys are phases that expand with heat and contract with cold. Through calculation, it can be obtained that under a certain composition ratio, metal parts Has zero expansion and contraction;

[0027] 2) Select metal powder and organic binder powder that do not include Sn-Bi, wherein the...

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Abstract

The invention relates to a selective laser sintering method for preparing zero-expansion/shrinkage-rate metal parts. The method comprises calculation of multi-phase alloy components, mixing of metal powder and organic adhesive powder, digital-analog slice layering treatment of formed parts, molding of porous blanks through selective laser sintering, debonding treatment of the porous blanks, melting of Sn-Bi alloys and infiltration in the blanks, and obtaining of final formed parts through after-treatment. After two structures with zero expansion rate and zero shrinkage rate are mixed, the metal parts with zero expansion rate and zero shrinkage rate can be obtained by an added material manufacturing forming technology and a diffusion metalizing method. The preparation method has advantages such as convenient operation, reliable performance, low comprehensive cost, light weight of the metal formed parts, smooth surface and capability of satisfying the use requirements and prolonging the service life, and can be widely popularized and applied.

Description

technical field [0001] The invention relates to the technical field of metal laser additive manufacturing, in particular to a laser selective area sintering method for preparing metal parts with zero expansion and shrinkage ratio. Background technique [0002] When using additive manufacturing technology to obtain metal parts, the microstructure of the metal or alloy is usually a quenched non-equilibrium structure. Generally speaking, they are all thermal expansion and contraction types. As the temperature changes, thermal stress will be generated inside the parts, resulting in micro-cracks, which will affect the performance of the parts and reduce their service life. Currently, there is no technology for obtaining metal parts with zero expansion and zero shrinkage. The Sn-Bi alloy is a low melting point alloy, its eutectic point is located at 42% Sn and 58% Bi, and its eutectic temperature is 138°C. It shrinks when heated and expands when cooled within a certain temperatu...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/26B33Y10/00
CPCB22F3/1021B22F3/1025B22F3/26B33Y10/00B22F2998/10B22F10/00B22F10/28B22F10/64B22F10/36B22F12/41B22F12/53B22F10/34B22F10/68B22F1/10B22F10/20B22F1/142Y02P10/25
Inventor 顾德阳
Owner 四川三阳激光增材制造技术有限公司
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