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A preheating method and device suitable for powder-spreading additive manufacturing

A technology of additive manufacturing and powder spreading device, which is applied in the field of additive manufacturing, can solve problems such as waste, difficulty in repair, and failure of part forming, and achieve the effects of efficient and uniform preheating, reduced heat dissipation, and high preheating efficiency

Active Publication Date: 2019-12-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additive manufacturing of large-sized parts usually takes tens or even hundreds of hours. Defects such as cracks induced by internal stress during the forming process are irreversible and difficult to repair, which will directly lead to the failure of the forming of the part, which is a great waste

Method used

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  • A preheating method and device suitable for powder-spreading additive manufacturing
  • A preheating method and device suitable for powder-spreading additive manufacturing
  • A preheating method and device suitable for powder-spreading additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: rail type preheating device

[0060] The device that embodiment 1 adopts is as Figure 4 As shown, the device includes a high-energy beam generation and control module 1, a forming cavity 2, a forming table 3, a powder spreading device 7, a forming cylinder 8, first and second powder feeding devices 9, 9', first and second The powder recovery device 10, 10' and the control system 11 also include the first and second plane heating plates 4, 4', the first and second heating plate motion guide rails 5, 5' and the first and second temperature measuring sensors 6 , 6'.

[0061] Among them, the high-energy beam generation and control module 1 is located at the top of the equipment, and the first and second powder feeding devices 9 and 9' and the first and second powder recovery devices 10 and 10' are respectively located on both sides of the equipment to realize two-way powder feeding and powder Recycle. The first and second flat heating plates 4, 4' are plac...

Embodiment 2

[0072] Embodiment 2: Foldable preheating device (two-way powder spreading)

[0073] The device that embodiment 2 adopts is as Figure 5 As shown, the device includes a high-energy beam generation and control module 1, a forming cavity 2, a forming table 3, a powder spreading device 7, a forming cylinder 8, first and second powder feeding devices 9, 9', first and second The powder recovery device 10, 10' and the control system 11 also include the first and second planar heating plates 4, 4', the first heating plate moving guide rail 5 (the first heating plate moving guide rail 5 is a pair of linear guide rails here) And the first and second temperature measuring sensors 6, 6'.

[0074] Figure 5 The device shown is Figure 4 The difference of the shown devices is that the first and second planar heating plates 4, 4' and the first and second heating plate moving rail pairs 5, 5' are set differently. specific, Figure 4 The first and second heating plate movement guide rail ...

Embodiment 3

[0086] Embodiment 3: Foldable preheating device (one-way powder spreading)

[0087] The device used in this embodiment is as Figure 8 As shown, it includes a high-energy beam generation and control module 1, a forming cavity 2, a forming table 3, a powder spreading device 7, a forming cylinder 8, a first powder feeding device 9, a first powder recovery device 10, a control system 11 and a first One, the second sensor placement table 12,12' also includes the first and second plane heating plate groups 4,4', the first heating plate moving guide rail 5 (the first heating plate moving guide rail 5 is a pair of linear guide rails here ) and the first and second temperature measuring sensors 6, 6'. The first and second sensor placement platforms 12, 12' are arranged on both sides of the forming cylinder 8, and are respectively used for installing the first and second temperature measuring sensors 6, 6'.

[0088] Among them, the high-energy beam generation and control module 1 is ...

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Abstract

The invention provides a preheating method and device suitable for powder-spreading additive manufacturing, which belongs to the technical field of additive manufacturing. A movable plane heating plate capable of covering the entire powder bed is placed directly above the powder bed, and the plane heating The installation height of the plate is slightly higher than that of the powder spreader. During the powder spread process, the powder bed and parts are preheated. After the powder spread is completed, the plane heat source is turned off and put away to prevent the plane heating plate from blocking the high-energy beam during processing. During the heating process, the temperature sensor is used to monitor the temperature of the powder bed in real time, and the control system is used to implement feedback control on the preheating of the powder bed according to the temperature monitoring results. Through full-surface coverage heating, high-temperature, efficient and uniform preheating of the powder bed and formed parts can be achieved. The present invention also provides a device for realizing the above method. This method is suitable for a wide range of materials and has strong scalability, and is especially suitable for powder-spreading additive manufacturing with large formats and multiple high-energy beams.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and specifically relates to a fully-covered preheating method and device for heating powder beds and formed parts. Powder-spread additive manufacturing with high-energy beams. Background technique [0002] Powder-spreading additive manufacturing technology uses high-energy beams (laser beams, electron beams, plasma beams, etc.) as heat sources to directly manufacture parts by melting or sintering metal, non-metal or composite material powder layer by layer. Because the powder particle size is usually small, which can achieve a small layer thickness, the technology's ability to directly manufacture high-precision complex parts makes this technology stand out among many additive manufacturing technologies. When the powder-spreading additive manufacturing technology forms a part, the powder is firstly laid layer by layer to form a powder layer, and the high-energy beam is selected to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/153B29C64/295B29C64/393B22F3/105B33Y10/00B33Y50/02
CPCB22F3/105B33Y10/00B33Y50/02B22F2003/1051B22F10/00B22F12/10B22F10/73B22F12/90B22F10/28B22F10/362B22F12/13B22F12/55Y02P10/25
Inventor 王泽敏喻寒琛杨晶晶杨慧慧黄文普曾晓雁
Owner HUAZHONG UNIV OF SCI & TECH
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