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A hot isostatic pressing method based on additive manufacturing

A technology of hot isostatic pressing and additive manufacturing, which is applied in the direction of additive processing, etc., to achieve the effects of controllable forming, support and shape maintenance, and rapid and high-precision forming

Active Publication Date: 2019-07-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although the method of the present invention introduces the idea of ​​additive manufacturing, it is still a hot isostatic pressing method. The purpose of introducing the idea of ​​additive manufacturing is to change the form of raw materials, so as to fundamentally abandon the original powdery materials and improve Layered materials are used to overcome various defects in hot isostatic pressing of powdered materials. The idea of ​​additive manufacturing is only reflected in the process of using layered raw materials to prepare three-dimensional objects, that is, in the pre-processing of raw materials. In this paper, the idea of ​​additive manufacturing is used, but the subsequent forming process is hot isostatic pressing, and the new method of hot isostatic pressing, which uses layered materials instead of powder materials, overcomes the problem of hot isostatic pressing of complex parts. technical bottleneck

Method used

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  • A hot isostatic pressing method based on additive manufacturing
  • A hot isostatic pressing method based on additive manufacturing
  • A hot isostatic pressing method based on additive manufacturing

Examples

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Effect test

Embodiment 1

[0049] see figure 2 (a)~(c), the present embodiment utilizes the method for manufacturing the Ti-6Al-4V titanium alloy gear parts of height 100mm, diameter 250mm, among the figure 1 is that solid line represents Ti-6Al-4V titanium alloy slice, 2 The dotted line represents the pure aluminum support material, and 3 is a cylindrical sheath, which specifically includes the following steps:

[0050] 1) According to the 3D CAD model of the titanium alloy gear, the 0.5mm thick slice and the 2D information of the slice are obtained after being processed by the slicing software. -All two-dimensional slices are processed on the 4V titanium alloy plate;

[0051] 2) Select pure aluminum as the support material, and cut out the corresponding slice shape from the pure aluminum sheet support material with a thickness of 0.5mm and a diameter of 280mm according to the slice information of each layer of the target part, where the diameter of the support material is slightly larger than the di...

Embodiment 2

[0061] The product of preparation and process are identical with embodiment 1, just step 5) in vacuum tightness is 10 -4 Pa, in step 6), the temperature and pressure are raised to 600°C and 200MPa at the same time, and the heat preservation and pressure are maintained for 2 hours. 4V titanium alloy gear.

Embodiment 3

[0063] The product of preparation and process are identical with embodiment 1, just step 5) in vacuum tightness is 10 -4 Pa, in step 6), the temperature and pressure are raised to 600°C and 80MPa at the same time, and the heat preservation and pressure are kept for 7 hours. 4V titanium alloy gear.

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Abstract

The invention belongs to the field of advanced manufacturing, and in particular, discloses a hot isostatic pressure forming method based on added material manufacturing. The method adopts a laminar structure material to replace a powder material as a raw material of hot isostatic pressure forming based on the thought of added material manufacturing, and realizes hot isostatic pressure forming of parts to be formed through using a support material and twice hot isostatic pressure treatments. The method discards a common powder material in a hot isostatic pressure process, uses the laminar material for replacement to radically solve multiple problems of difficult machining and difficult removal of a complicated cover and an internal shape control molding core, difficult realization of precise shape control of complicated computer simulation in the powder compaction process in the hot isostatic pressure process, difficult fatigue removal of powder particle boundary in parts and low performances, has the advantages of controllable formation and convenience to operate, and is suitable for quick high-precision formation of such parts as cabinets, gears and turbines with complicated internal structures.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and more specifically relates to a hot isostatic pressing method based on additive manufacturing. Background technique [0002] The hot isostatic pressing process is a kind of pressure transmission medium that uses inert gas such as nitrogen or argon as the pressure transmission medium. The parts exert equal pressure in all directions. This technology can be used as a powder metallurgy process for direct heating, pressing and sintering of powder. In recent years, this technology has been combined with mold shape control technology and computer simulation, so that the loose powder is driven by pressure and temperature to achieve powder compaction and complete the overall near-net shape of the target part. At present, because the parts formed by this process have uniform structure and the mechanical properties are equivalent to forgings of the same material, they are widely used in the formi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B33Y10/00B33Y30/00
CPCB22F3/15B22F2003/153B33Y10/00B33Y30/00
Inventor 史玉升蔡超严倩薛鹏举魏青松宋波
Owner HUAZHONG UNIV OF SCI & TECH
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