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Double-beam SLM forming method and system considering forming efficiency and forming quality

A double-beam, high-efficiency technology, applied in the direction of improving process efficiency, improving energy efficiency, and additive processing, can solve the problems of difficult control of metallurgical defects, low forming efficiency, and easy deformation and cracking of parts, so as to reduce residual stress, Improve forming efficiency and prevent deformation and cracking

Active Publication Date: 2021-01-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a dual-beam SLM forming method and system that takes into account both forming efficiency and forming quality, aiming to solve the common problem of forming efficiency deviation when forming metal parts with existing SLM technology. Low, difficult to control internal metallurgical defects of parts, easy deformation and cracking of parts

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  • Double-beam SLM forming method and system considering forming efficiency and forming quality
  • Double-beam SLM forming method and system considering forming efficiency and forming quality
  • Double-beam SLM forming method and system considering forming efficiency and forming quality

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Embodiment 1

[0051] In this embodiment, the processing of the TC4 titanium alloy pre-rotating nozzle is taken as an example to describe the forming method of the present invention, and the specific steps are:

[0052] (1) Divide the digital model of the pre-rotating nozzle into a high-precision forming area and a high-efficiency forming area, and slice the digital model to obtain S-layer slice layer information (S≥2); among them, the high-precision forming area is the nozzle , this area requires high precision and is difficult to carry out subsequent machining; the rest of the area can be formed by high-power laser beams, and has low precision requirements, allowing subsequent machining, so it is set as a high-efficiency forming area;

[0053] (2) Apply laser selective melting to the metal powder bed according to the slice information of the first layer:

[0054] If the slice layer only contains high-precision forming areas, use figure 2 The energy distribution of 1 beam shown is a low-p...

Embodiment 2

[0059] This embodiment takes the processing of the AlSi10Mg aluminum alloy curved surface liquid-cooled cold plate as an example to illustrate the forming method of the present invention. The specific steps are:

[0060] (1) Divide the digital model of the liquid-cooled cold plate into a high-precision forming area and a high-efficiency forming area, and slice the digital model to obtain S-layer slice layer information (S≥2), where the high-precision forming area is The antenna pre-installation surface of the cold plate requires high dimensional accuracy and is difficult to carry out subsequent machining; the rest of the area can be formed by high-power laser beams, and the precision requirements are low, allowing subsequent machining, so it is set as a high-efficiency forming area;

[0061] (2) Apply laser selective melting to the metal powder bed according to the slice information of the first layer:

[0062] If the slice layer only contains high-precision forming areas, use...

Embodiment 3

[0067] In this embodiment, the processing of the GH4169 nickel-based superalloy aero-engine cabin section is taken as an example to illustrate the forming method of the present invention. The specific steps are:

[0068] (1) Divide the digital model of the engine compartment section into a high-precision forming area and a high-efficiency forming area, and slice the digital model to obtain S-layer slice layer information (S≥2), where the high-precision forming area is the cabin The epitaxial cooling pipeline of the section, the structure of this area is complex, it is difficult to use high-power laser forming, and the rest of the area is a high-efficiency forming area;

[0069] (2) Apply laser selective melting to the metal powder bed according to the slice information of the first layer:

[0070] If the slice layer contains only high-precision forming areas, use 1 beam figure 2The energy distribution shown is Gaussian mode medium power, medium spot laser beam shaping, where...

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Abstract

The invention belongs to the technical field of advanced manufacturing, and particularly discloses a double-beam SLM forming method and system considering the forming efficiency and the forming quality. High-precision forming of metal parts is achieved through medium / low-power and medium / small-light-spot laser beams with energy distribution in a Gaussian mode, high-efficiency forming of the metalparts is achieved through high-power and large-light-spot laser beams with energy distribution in an annular or flat-topped mode, and therefore, high-efficiency and high-quality SLM forming of the metal parts is achieved. According to the method and system, tight metallurgical bonding of a high-efficiency forming area and a high-precision forming area can be achieved, the formation of internal metallurgical defects such as insufficient fusion and large-particle mixing is effectively restrained, the residual stress of a forming material is substantially reduced, and high-efficiency and high-quality SLM forming of the metal parts is achieved.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology, and more specifically relates to a double-beam SLM forming method and system that takes into account both forming efficiency and forming quality. Background technique [0002] Selective Laser Melting (SLM) is the mainstream metal 3D printing technology at this stage. It uses a scanning galvanometer to drive a high-energy-density laser beam, and selectively applies a layer-by-layer pre-laid metal powder bed according to the two-dimensional slice data of the part. Melting and stacking, to achieve moldless, short-cycle, near-net shape of various complex metal parts. [0003] However, the existing SLM technology usually uses medium / low power (≤1000W), medium / small spot (≤200μm) laser beam, which has the following shortcomings: 1) The selection of important parameters such as scanning speed, scanning distance, and layer thickness are mutually restricted , which seriously limits the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y30/00
CPCB22F3/003B33Y10/00B33Y30/00Y02P10/25
Inventor 曾晓雁魏恺文李祥友刘梦娜黄高邓金凤
Owner HUAZHONG UNIV OF SCI & TECH
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