Method for inhibiting powder bed electron beam 3D printing powder from splashing

A 3D printing and electron beam technology, applied in the field of additive manufacturing, which can solve problems such as powder splashing and pilling on the surface of parts

Active Publication Date: 2020-08-25
广州赛隆增材制造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when melting for the first time, there will still be splashes of powder, and the splas...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a method for suppressing powder bed electron beam 3D printing 316L stainless steel alloy powder splashing, the specific steps are as follows:

[0069] Step 1. Heat the bottom plate to 780°C, and then spread powder on the bottom plate. The powder is 316L stainless steel alloy powder with a particle size in the range of 53 μm to 105 μm. The area of ​​the bottom plate used is 120 mm×120 mm, and the thickness of the powder coating is 0.05 mm.

[0070] Step 2. Carry out the first round (1 time) of electron beam scanning preheating to the powder on the molding section of the powder bed. This time, the preheating current of the electron beam scanning preheating is 24mA, the scanning speed is 12m / s, and the scanning time is 14s.

[0071] Step 3: Perform a second round of electron beam scanning preheating on the powder on the preset area of ​​the powder bed and the powder on the area where the preset area extends 0.5 mm to 3 mm (1 time, that is, solid ...

Embodiment 2

[0077] This embodiment provides a method for suppressing powder bed electron beam 3D printing of 316L stainless steel alloy powder from splashing, which is basically the same as the method in Embodiment 1, the only difference being that the process parameters of the second round of electron beam scanning preheating are different. Specific steps are as follows:

[0078] Step 1. Heat the bottom plate to 780°C, and then spread powder on the bottom plate. The powder is 316L stainless steel alloy powder with a particle size in the range of 53 μm to 105 μm. The area of ​​the bottom plate is 120 mm×120 mm, and the thickness of the powder coating is 0.05 mm.

[0079] Step 2. Carry out the first round (1 time) of electron beam scanning preheating to the powder on the molding section of the powder bed. This time, the preheating current of the electron beam scanning preheating is 24mA, the scanning speed is 12m / s, and the scanning time is 14s.

[0080] Step 3: Perform a second round o...

Embodiment 3

[0086] This embodiment provides a method for suppressing powder bed electron beam 3D printing 316L stainless steel alloy powder splashing, which is basically the same as the method in Embodiment 1, the only difference being that the powder on the preset area is preheated twice by electron beam scanning ( Solid powder 2 times). Specific steps are as follows:

[0087]Step 1. Heat the bottom plate to 780°C, and then spread powder on the bottom plate. The powder is 316L stainless steel alloy powder with a particle size in the range of 53 μm to 105 μm. The area of ​​the bottom plate is 120 mm×120 mm, and the thickness of the powder coating is 0.05 mm.

[0088] Step 2. Carry out the first round (1 time) of electron beam scanning preheating to the powder on the molding section of the powder bed. This time, the preheating current of the electron beam scanning preheating is 24mA, the scanning speed is 12m / s, and the scanning time is 14s.

[0089] Step 3: Perform a second round of e...

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Abstract

The invention relates to a method for inhibiting powder bed electron beam 3D printing powder from splashing. The method comprises the following steps that first-round electron beam scanning preheatingis carried out on powder in a forming section of a powder bed; second-round electron beam scanning preheating is conducted on powder in a preset area of the powder bed, wherein the preheating currentof each time of second-round electron beam scanning preheating ranges from 5 mA to 40 mA, and the scanning speed ranges from 2 m/s to 20 m/s; and the powder on the preset area after second-round electron beam scanning preheating is melted, and third-round of electron beam scanning preheating is carried out on the powder on the forming section of the powder bed. By the adoption of the method, splashing of the powder is basically avoided in the 3D printing process, and a component obtained after 3D printing is high in density and small in surface roughness.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for suppressing powder splashing of powder bed electron beam 3D printing. Background technique [0002] Additive manufacturing technology is not only an internationally recognized new technology, but also a strategic technology related to the leapfrog development of the manufacturing industry. At present, this technology has been widely used in aerospace, biomedical, consumer electronics, molds and other fields. [0003] Powder bed electron beam selective melting technology is a metal additive manufacturing technology that uses electron beams as the energy source. It is based on digital models, and can achieve fine and complex parts through layer-by-layer powder coating on the powder bed and selective melting of energy beams. Direct molding is an important technical means in the fields of biomedicine, aerospace and other fields. [0004] However, in the ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00B33Y50/02B33Y70/00
CPCB33Y10/00B33Y50/02B33Y70/00B22F10/00B22F10/36B22F10/28B22F10/362Y02P10/25
Inventor 龙学湖郭瑜潘彦明汪强兵郑晓川张莹
Owner 广州赛隆增材制造有限责任公司
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