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A powder bed simultaneous heating and melting additive manufacturing method

A technology of additive manufacturing and powder bed, which is applied in the field of additive manufacturing, can solve the problems of inner hole forming failure, inner hole powder is difficult to remove, and affect the surface finish of parts, so as to avoid large fluctuations, reduce thermal stress, and enhance stability and consistent effect

Active Publication Date: 2021-05-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, if the powder bed temperature is too high, too much powder will be welded to the cross-sectional profile, which will not only affect the surface finish of the part, but also make it difficult to remove the powder in the inner hole, resulting in the failure of inner hole forming

Method used

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  • A powder bed simultaneous heating and melting additive manufacturing method
  • A powder bed simultaneous heating and melting additive manufacturing method
  • A powder bed simultaneous heating and melting additive manufacturing method

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Embodiment 1

[0064] like figure 1 The powder bed synchronous heating and melting process and device shown. Including: vacuum forming chamber 4, working platform 7, forming cylinder 8, piston type lifting device 81, powder feeder 5, powder laying device 6, electron beam emission gathering scanning device 2 for emitting electron beam in heating mode, electron beam emission in melting deposition mode The electron beam emission of the beam focuses the scanning device 1 and a control computer (not shown) as a controller.

[0065] The electron beam emitting and focusing scanning device 2 includes a cathode 11 for generating an electron beam 23 , a grid 12 , an anode 13 , a focusing coil 14 , an astigmatism elimination coil 15 , and a deflection coil 16 . Electron beam emission focusing scanning device 2 emits heating mode electron beam 23 for preheating and heating scanning of the powder bed in the preheating area and heating area, electron beam emitting focusing scanning device 1 emits melting...

Embodiment 2

[0069] like Figure 5 The powder bed synchronous heating and melting process and device shown include: vacuum forming chamber 4, working platform 7, forming cylinder 8, piston type lifting device 81, powder feeder 5, powder laying device 6, anti-evaporation device 36, electronic A beam emitting focusing scanning device 2, a laser beam emitting focusing scanning device 3, and a control computer (not shown) as a controller.

[0070] The laser beam emitting and gathering scanning device 3 includes a laser light source 31 that generates laser light and a focusing scanning device 32 connected to the laser light source 31, generates a laser beam 37 that passes through the lead glass 33 and enters the vacuum forming chamber 4, and scans the area of ​​the formed part for sintering and melting powder.

[0071] The vacuum forming chamber 4 provides a vacuum environment for the selective melting process, and a working platform 7 is arranged horizontally in the middle. The powder feeder...

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Abstract

The invention belongs to the technical field of additive manufacturing, and relates to a powder bed synchronous heating and melting additive manufacturing method, which is used to realize material additive manufacturing under vacuum environment and high powder bed temperature conditions. This method maintains the powder bed temperature in the non-part cross-sectional area by performing simultaneous electron beam heating on the non-part cross-sectional area while performing selective melting deposition to form the part cross-section, avoids large fluctuations in the powder bed temperature, and ensures electron beam heating in the non-part cross-sectional area. The time that the beam stays on the unit area of ​​different positions of the powder bed is equal, so that the energy density of the electron beam received by different positions in the preheating area is equal, and the temperature at different positions in the preheating area is uniform, thereby enhancing the powder bed temperature in the powder bed fusion technology. The stability and consistency of this key process parameter, in turn, reduces the thermal stress of the formed parts, improves the consistency of the performance of the formed parts, and creates conditions for the additive manufacturing of refractory, refractory, and brittle materials.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and relates to a powder bed synchronous heating and melting additive manufacturing method, which is used to realize material additive manufacturing under vacuum environment and high powder bed temperature conditions. Background technique [0002] The powder bed fusion technology in the additive manufacturing of parts has great advantages in the forming of complex structural parts and the forming of special materials. This process usually uses high-energy electron beams or laser beams as a heat source to sinter or melt materials layer by layer, so that materials are piled up layer by layer. Typical processes include selective laser melting (Selective Laser Melting, SLM) and electron beam selective melting (Electron Beam Selective Melting, EBSM). [0003] Among them, the laser selective melting technology has higher precision and smaller surface roughness. However, since the laser ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00Y02P10/25
Inventor 林峰李阳李宏新余业锋张磊
Owner TSINGHUA UNIV
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