A method and system for forming parts based on additive manufacturing and hot isostatic pressing

A technology of additive manufacturing and hot isostatic pressing, which is applied in the fields of instrumentation, geometric CAD, design optimization/simulation, etc., can solve problems such as uneven stress distribution, achieve high preparation flexibility, reduce stress concentration, and overcome manufacturing difficulties Effect

Active Publication Date: 2022-07-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through stress analysis, the present invention divides the larger part of the stress into multiple discrete unit blocks and / or hollow grid structures to disperse the stress, and then adopts additive manufacturing methods for the unit blocks, grid structures and shells, etc. The complex structure is prepared, and finally the multiple unit blocks and the hollow grid structure are densified by the hot isostatic pressing technology, which not only overcomes the preparation problem of the complex envelope in the prior art, but also solves the problems in the preparation process of the existing parts. The problem of uneven stress distribution

Method used

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  • A method and system for forming parts based on additive manufacturing and hot isostatic pressing
  • A method and system for forming parts based on additive manufacturing and hot isostatic pressing
  • A method and system for forming parts based on additive manufacturing and hot isostatic pressing

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Embodiment 1

[0059] The structural shape of the part to be formed is such as figure 2 and image 3 As shown, its material is SUS316L.

[0060] First, according to the method in step S1, simulation simulation and structural stress analysis of the part to be formed are carried out, so as to obtain the area with large stress during the additive manufacturing process.

[0061] Then, the method in step S2 is used to redesign and optimize the area with high stress. In the embodiment of the present disclosure, the area is divided into discrete unit blocks to reduce the stress in the additive manufacturing process. Figure 4 where a and b are discrete unit blocks of different sizes, wherein the stress corresponding to the smaller size unit block is greater than that of the larger size unit block. Figure 4 The c in it is the dense shell conforming to the hot isostatic pressing process. Figure 4 The d in it is the exhaust port that conforms to the hot isostatic pressing process.

[0062] Next...

Embodiment 2

[0067] The structural shape of the part to be formed is such as figure 2 and image 3 As shown, its material is Ti6Al4V.

[0068] First, simulate and analyze the structural stress of the part to be formed according to the corresponding method in step S1, and obtain the area with large stress during the additive manufacturing process.

[0069] Then, the method in step S2 is used to redesign and optimize the area with high stress. In the embodiment of the present disclosure, the area is divided into a grid structure to reduce the stress in the additive manufacturing process. Figure 7 The e area in is the divided grid structure, Figure 8 It is an enlarged view of the grid structure, and each grid structure is connected with holes, so that each grid structure is connected to others. Figure 7 The f region in is a dense shell conforming to the hot isostatic pressing process, Figure 7 The g area in is the exhaust port that conforms to the hot isostatic pressing process.

[...

Embodiment 3

[0075] The structural shape of the part to be formed is such as figure 2 and image 3 As shown, its material is IN718.

[0076] First, simulate and analyze the structural stress of the part to be formed according to the corresponding method in step S1, and obtain the area with large stress during the additive manufacturing process.

[0077] Then, the method in step S2 is used to redesign and optimize the area with high stress. In the embodiment of the present disclosure, the area is divided into discrete unit blocks and grid structures to reduce the stress in the additive manufacturing process. Figure 11 The unit blocks of different structures are divided in the h region. Figure 11 The i region in the middle is the divided grid structure. Figure 11 The j in it is a dense shell conforming to the hot isostatic pressing process, which acts as a sheath for subsequent hot isostatic pressing. Figure 12 and Figure 13 It is part of the casings and parts manufactured by othe...

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Abstract

The invention belongs to the technical field of mechanical processing, and discloses a part forming method based on additive manufacturing and hot isostatic pressing. The method firstly analyzes the forming stress of the part to be formed, and then divides the part to be formed into multiple parts according to the magnitude of the stress. a discrete unit block and / or hollow grid structure, the unit block and / or hollow grid structure are prepared by an additive manufacturing method, and a shell is prepared on the outer surface of the discrete unit block and / or grid structure to serve as a thermal For the envelope structure required for isostatic pressing, the gas between the unit blocks and or inside the network structure is evacuated through the air outlet on the shell, and then the air outlet is sealed, and finally hot isostatic pressing is performed to obtain the parts. The present application also provides a part forming system based on additive manufacturing and hot isostatic pressing. The method and system in the present application not only overcomes the problem of preparing complex envelopes in the prior art, but also avoids the problem of uneven stress distribution during the preparation of existing parts.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and more particularly, relates to a part forming method and system based on additive manufacturing and hot isostatic pressing. Background technique [0002] The direct additive manufacturing method of metal parts in the prior art (also known as 3D printing, incremental manufacturing or rapid prototyping) mainly uses high-power heat sources such as laser beams, electron beams, plasma beams, etc. Layer-by-layer rapid solidification forms, and finally parts with dense and complex structures are obtained. However, due to the repeated rapid cooling and rapid heating of the parts formed layer by layer, the large uneven stress concentration in the parts can cause microscopic cracks, which can seriously lead to cracking of the entire part during or after forming. The microcracks and microscopic pores generated during the cooling process of the microscopic molten pool will lead to the uneve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/23G06F119/14
CPCG06F30/17G06F30/23G06F2119/14
Inventor 薛鹏举史玉升苏瑾魏青松刘洁蔡超滕庆
Owner HUAZHONG UNIV OF SCI & TECH
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