Control method for graded preheating of powder bed and additive manufacturing device

A technology of grading preheating and control method, which is applied in the field of additive manufacturing, can solve the problems of affecting the quality of the lower layer powder laying parts, not considering the melting section information, and the difficulty of uniform temperature field, etc., and achieves the difficulty of powder cleaning and post-processing. The effect of reducing and improving powder utilization and improving forming efficiency

Active Publication Date: 2022-04-29
西安赛隆增材技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technology of dividing the mesh to preheat the part area will make the temperature gradient of the part area and the unpreheated powder outside the part area larger, which will easily cause the powder bed around the part to curl and peel, and affect the quality of the lower powder layer and the forming quality of the part; Using concentric circles with different radii to reduce the preheating heat input sequentially from the outside to the inside can improve the temperature uniformity of the powder bed to a certain extent, but the heat input is large when the cross-section of each layer is melted, and the temperature distribution of the powder bed will change with the parts. The cross-section information changes, it does not consider the melting cross-section information of each layer of parts, it is difficult to obtain a uniform temperature field

Method used

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  • Control method for graded preheating of powder bed and additive manufacturing device
  • Control method for graded preheating of powder bed and additive manufacturing device
  • Control method for graded preheating of powder bed and additive manufacturing device

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Embodiment 1

[0084] This embodiment includes the following steps:

[0085] Step 1: The forming substrate 100 selects a 316L stainless steel substrate with a size of 150×150mm, imports a 3D model, the model size is 80×80×30mm, the slice thickness is 0.05mm, the scanning path is set, the surface layer is indented to 0.04mm, layer by layer The rotation angle is 90°, and the section information of each layer is obtained, and its section data is imported into the electron beam selective melting forming equipment, and the powder is added to the powder bin of the equipment at the same time, the powder is Ti 2 AlNb alloy powder, set the relevant processing parameters.

[0086] Step 2: Set the preheating area 200 to 140×140mm, identify the cross-sectional information of each layer through the computer program, and determine the preheating range S0 of the 0th grade in each layer according to the imported calculation formula and method, and the grading range S0 of the third layer in the third layer. ...

Embodiment 2

[0095] This embodiment includes the following steps:

[0096] Step 1: The forming base 100 selects a molybdenum substrate with a size of Φ160mm and imports the 3D model. The cross-sectional information of one layer of the model is as follows: Figure 5 As shown, the slice thickness is 0.07mm, the scanning path is set, the indentation of the surface layer is 0.02mm, and the layer-by-layer rotation angle is 90°, the section information of each layer is obtained, and the section data is imported into the electron beam selective melting forming equipment, and at the same time Add the powder into the powder bin of the equipment, the powder is molybdenum alloy powder, and set the relevant processing parameters.

[0097] Step 2: Set the preheating area 200 to Φ150mm. The computer software first identifies all the imported cross-section information. For parts with irregular cross-sections, typical size information can be obtained. The size information is not less than 3. According to ...

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Abstract

The invention relates to a control method for graded preheating of a powder bed and an additive manufacturing device. The method comprises the steps that a three-dimensional model of a to-be-printed part is sliced, and a scanning path is set to form scanning path data; according to the section shape of the current layer, the preheating range and preheating energy of the 0-th grade to the n-th grade are set; the energy source performs graded preheating on the powder according to the set preheating range and preheating energy of the current layer; scanning and melting the section according to the scanning path to complete printing of the current layer; and powder laying, preheating and scanning melting are repeated till printing of the whole part is completed. The powder bed is preheated in a graded preheating mode with the section shape of each layer of the printed part as the center, so that large temperature grading of a powder bed preheating area and a surrounding non-preheating area is avoided, the risk of curling, peeling or cracking of the powder bed is reduced, the heating influence of powder of the powder bed outside the section is reduced, the powder utilization rate is increased, and the production cost is reduced. Meanwhile, graded preheating can reduce energy input, and the forming efficiency is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of additive manufacturing, and in particular, to a method for controlling powder bed graded preheating and an additive manufacturing device. Background technique [0002] Additive manufacturing is an advanced manufacturing technology that is driven by data and accumulates materials layer by layer to form solid parts. Compared with traditional technologies, this technology has the characteristics of forming complex shapes and high-performance metal components. Customization and high material utilization rate have been widely used in aerospace, power energy, biomedical and other fields. The powder bed fusion technology spreads a layer of powder on the forming platform in advance through the powder spreading device to form a powder bed. Lay the next layer of powder and repeat the above process to form a three-dimensional solid part. In this process, the quality of the powder bed is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/85B22F10/28B22F12/13B22F12/90B33Y50/02B33Y40/10
CPCB22F10/85B22F10/28B22F12/13B22F12/90B33Y50/02B33Y40/10Y02P10/25
Inventor 车倩颖李会霞贺卫卫朱纪磊程康康王宇
Owner 西安赛隆增材技术股份有限公司
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