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Technological method for weakening selective electron beam sintering buckling deformation

An electron beam sintering and process method technology, which is applied in the field of additive manufacturing, can solve the problems of weakening the warpage deformation of parts without post-heat treatment, and achieve the effects of weakening the warpage deformation, high utilization rate of vacuum chamber and low cost

Active Publication Date: 2017-03-29
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its shortcoming is that it only changes the direction of heating and solidification, that is, changes the direction of thermal stress in each layer, without post-heat treatment, and cannot fundamentally weaken the warping deformation of parts

Method used

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  • Technological method for weakening selective electron beam sintering buckling deformation
  • Technological method for weakening selective electron beam sintering buckling deformation
  • Technological method for weakening selective electron beam sintering buckling deformation

Examples

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Effect test

Embodiment 1

[0039] The specific process is as figure 1 , the process of electron beam weakening the warping deformation of selective sintering is carried out according to the following steps:

[0040] 1. First, the electron beam heats the surface of the substrate (100×100×10mm) to red heat, the scanning speed is 8000mm / s, and the velocity flow is 20mA.

[0041] 2. Spread a layer of 0.1mm316L stainless steel powder on the substrate with a powder spreader.

[0042] 3. Use the electron beam to scan and preheat at a speed of 8000mm / s, and increase the speed from 2mA to 20mA, so that the powder particles can be initially bonded.

[0043] 4. Sinter the preheated powder with an electron beam with a speed of 500mm / s and a flow rate of 20mA, and scan the sintered constant temperature process section with an electron beam at a high speed of 10000mm / s immediately after sintering. 20mA, repeat the sintering and constant temperature process until the powder sintering of this layer is completed.

[...

Embodiment 2

[0046] A process method for electron beam weakening of warping deformation in selective sintering is carried out according to the following steps:

[0047] 1. First, heat the surface of the substrate (200×100×10mm) to red heat with an electron beam, the scanning speed is 8000mm / s, and the flow rate is 20mA.

[0048] 2. Spread a layer of 0.1mm316L stainless steel powder on the substrate with a powder spreader.

[0049] 3. Use the electron beam to scan and preheat at a speed of 8000mm / s, and increase the speed from 2mA to 20mA, so that the powder particles can be initially bonded.

[0050] 4. The preheated powder is sintered with an electron beam with a speed of 500mm / s and a velocity of 20mA, and the distance of the first constant temperature process section is 100mm. Scanning speed, constant temperature treatment with a flow rate of 20mA, and then continue with sintering with a constant temperature section of 80mm and constant temperature treatment of the entire powder layer,...

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Abstract

The invention discloses a technological method for weakening selective electron beam sintering buckling deformation, and belongs to the field of metal material additive manufacturing. According to the technological method, the buckling deformation caused by sequential heating time intervals during selective electron beam sintering is weakened, meanwhile, the combination between layers is promoted, and the technological method is adaptable to various materials which can be subjected to electron beam sintering. The technological method for weakening selective electron beam sintering buckling deformation comprises the following specific steps that a powder layer is formed through a power-supply device; and preheating and sintering are conducted on powder through an electron beam and postheating high-speed scanning is conducted on the powder in time to maintain temperature balance of the whole sintering face so as to realize the purpose of weakening the buckling deformation in the sintering process. Selective electron beam sintered products prepared through the technological method are high in surface evenness, small in grain size and improved in whole mechanical property.

Description

technical field [0001] The invention relates to an electron beam selective sintering method, in particular to a selective sintering method for electron beam warping and deformation reduction, and belongs to the field of additive manufacturing. Background technique [0002] Additive manufacturing equipment that directly manufactures metal parts using Selective Electron Beam Sintering (SEBS) technology, which can directly manufacture metal parts of any complexity, suitable for aerospace and automotive, mold manufacturing, medical implants Wait. [0003] Although this manufacturing method has the advantages of saving materials, simple processing and not being limited by several shapes, it still has disadvantages. Although the substrate and powder are preheated during the sintering process, because the scanning speed of the electron beam cannot reach the desired value, there will be a difference in solidification time during the sintering process, which will cause accumulated t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/362B22F10/36B22F10/28B22F10/364Y02P10/25
Inventor 彭勇李洪强周琦陈鑫王克鸿樊新民张芬
Owner NANJING UNIV OF SCI & TECH
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