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Manufacturing method of large size thin-walled titanium alloy cylindrical part and cylindrical mould

A manufacturing method and technology of titanium alloy, which is applied in the field of manufacturing titanium alloy cylindrical parts, can solve the problems of poor dimensional accuracy, non-integral products, and many product defects of large-scale thin-walled titanium alloy cylindrical parts, and achieve product quality. Good dimensional stability, good defect control, good dimensional control effect

Active Publication Date: 2009-11-18
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Casting technology can be used to form some large-scale thin-walled cylindrical parts, but limited by the method itself, the products produced by it have low material properties, and have defects such as porosity, shrinkage, and segregation, and cannot be completely processed through subsequent processing. Eliminate these defects, so cast products cannot be used on products with higher requirements, such as pressure vessels, airtight components, some key structural parts, etc.
[0004] Forging technology can be used to manufacture high-performance products, but its forming ability is very limited. It is very difficult to manufacture large-sized thin-walled cylindrical parts, especially products with relatively large length and diameter, which cannot be manufactured. Even if certain sizes of products can be forged, The wall thickness is generally very large, the material waste is serious, and the cost is expensive
[0005] Manufacturing large-size thin-walled titanium alloy cylindrical parts by roll-bending welding method has poor dimensional accuracy and longitudinal weld seams. It is not an integral product, which has a great impact on subsequent welding processes. It is difficult to improve the structure and reliability Used in products such as pressure vessels with high requirements
[0006] Therefore, there are obvious shortcomings in the manufacture of large-scale thin-walled titanium alloy cylindrical parts by traditional technology: casting technology has strong forming ability and low cost, but poor performance and many product defects; products prepared by forging technology have good material performance, but the forming Limited capacity and high cost; roll-bending welded products have poor precision and low reliability
It is difficult to prepare titanium alloy cylindrical parts with high performance and no defects, large size and thin wall, large aspect ratio, high precision and low cost at the same time with traditional technology

Method used

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  • Manufacturing method of large size thin-walled titanium alloy cylindrical part and cylindrical mould
  • Manufacturing method of large size thin-walled titanium alloy cylindrical part and cylindrical mould
  • Manufacturing method of large size thin-walled titanium alloy cylindrical part and cylindrical mould

Examples

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, manufacture a kind of size is Φ600 * 2 * 800mm (outer diameter * wall thickness * height) TC4 titanium alloy cylindrical piece, adopt the manufacturing method of a kind of large-scale thin-walled titanium alloy cylindrical piece of the present invention and cylindrical moulds.

[0031] Such as figure 2 As shown, the mold used includes a cylindrical outer sheath 1 and a cylindrical inner sheath 2, the outer sheath 1 and the inner sheath 2 form a cavity 7 filled with titanium alloy powder, and the inner sheath 2 is provided with a cylindrical Shaping die 3; the top and bottom ends of the cavity 7 filled with titanium alloy powder are respectively fixed with an upper wrapping cover 4 and a lower wrapping cover 8 for encapsulating the cavity; the upper wrapping cover 4 is provided with a degassing pipe 6 , a gasket 5 is provided under the upper cover cover 4 . Above-mentioned outer sheath 1, inner sheath 2 and setting die 3 are all made of car...

Embodiment 2

[0044] Manufacture a TA7 large-size thin-walled cylindrical part with a size of Φ200×1.5×300mm (outer diameter×wall thickness×height), using such as figure 2 For the cylindrical mold shown, the specific manufacturing steps are as follows:

[0045] (1) Selection of raw material powder:

[0046]Select TA7 titanium alloy spherical powder with mixed particle size within the particle size range of 45μm~250μm, of which the particle size is 181μm~250μm accounting for 50% of the total, the particle size is 151μm~180μm accounting for 20% of the total, and the particle size is 45μm~150μm 30% of the total.

[0047] (2) Powder loading and packaging:

[0048] Put the titanium alloy powder into the cavity 7 formed by the outer sheath 1 and the inner sheath 2 to fill the titanium alloy powder under the condition of vibration. The cover 4, the vacuum degree in the cavity 7 is higher than 4×10 -2 Pa.

[0049] (3) hot isostatic pressing

[0050] The cylindrical mold of the above-mentione...

Embodiment 3

[0054] To manufacture a TC4 large-size thin-walled cylindrical part with a size of Φ800×10×1000mm (outer diameter×wall thickness×height), the specific manufacturing steps are as follows:

[0055] (1) Selection of raw material powder:

[0056] Select TC4 titanium alloy spherical powder with a mixed particle size within the particle size range of 45μm-250μm, of which the particle size is 181μm-250μm accounting for 30% of the total, the particle size is 151μm-180μm accounting for 50% of the total, and the particle size is 45μm-150μm 20% of the total.

[0057] (2) Powder loading and packaging:

[0058] Put the titanium alloy powder into the cylindrical mold under the condition of vibration, after filling, degas, and use argon arc welding to seal the mold under the vacuum condition, the vacuum degree in the mold is higher than 4×10 -2 Pa.

[0059] (3) hot isostatic pressing

[0060] The cylindrical mold of the above-mentioned encapsulated titanium alloy powder is subjected to h...

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Abstract

The invention provides a manufacturing method of a large size thin-walled titanium alloy cylindrical part, comprising the steps of: (1) raw material powder selection; (2) powder loading and encapsulation; (3) hot isostatic pressing; and (4) cylindrical part blank processing. The invention also provides a cylindrical mould used for manufacturing the large size thin-walled titanium alloy cylindrical part, comprising a cylindrical outer sheath and a cylindrical inner sheath. A cavity for loading titanium alloy powder is formed by the outer sheath and the inner sheath, and the inner sheath is internally provided with a cylindrical shaped mould; an upper sheath cover and a lower sheath cover for encapsulating the cavity are respectively fixed at the top end and the bottom end of the cavity for loading titanium alloy powder; and the upper sheath cover is also provided with a gas removing pipe. Different from a plurality of traditional manufacturing methods, the invention can simultaneously meet the requirements of high performance, no defect, large size thin-wall, large length-diameter ratio, high precision, low cost, and the like.

Description

technical field [0001] The invention relates to a method for manufacturing a titanium alloy cylindrical part, in particular to a method for manufacturing a large-scale thin-walled titanium alloy cylindrical part and a cylindrical mold. Background technique [0002] Titanium alloy cylindrical parts of various sizes are widely used in military and civilian products. Due to the high strength of titanium alloy and difficulty in thermal deformation, it is very difficult to process and form titanium alloy cylindrical parts, especially large-size, large-length-to-diameter ratio, and thin-walled products. The traditional manufacturing techniques for this type of product mainly include casting, forging, roll bending and welding. [0003] Casting technology can be used to form some large-scale thin-walled cylindrical parts, but limited by the method itself, the products produced by it have low material properties, and have defects such as porosity, shrinkage, and segregation, and can...

Claims

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Application Information

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IPC IPC(8): B22F3/14B22F5/12
Inventor 王亮郎泽保
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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