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Preparation method of TC4 titanium alloy thin-wall high-barrel ring piece or pipe forging

A titanium alloy, thin-walled technology is applied in the field of preparation of high-performance TC4 titanium alloy thin-walled and high-cylinder ring or tube forgings, which can solve the problems of poor market core competitiveness, large differences in forging sizes, and impact on microstructure and properties. Achieve the effect of reducing production cost, shortening production cycle and improving microstructure

Active Publication Date: 2021-08-27
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional free forging requires multi-fire forming, and its disadvantages are large size differences of forgings, large machining allowance, poor process controllability, and poor quality stability
And because the forming must be completed by multiple fires, it will have a certain impact on the structure and properties.
Therefore, the existing free forging preparation technology to prepare thin-walled high-tube rings has problems such as high forging cost, low yield, poor batch stability, and poor market core competitiveness.

Method used

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  • Preparation method of TC4 titanium alloy thin-wall high-barrel ring piece or pipe forging

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preparation example Construction

[0022] The preparation method of TC4 titanium alloy thin-walled high cylinder ring or pipe forging of the present invention, its steps are as follows:

[0023] 1) High temperature forging: billet forging, at least 2 times of upsetting and drawing forging, and the cumulative forging ratio is 6-8; among them, the first heating time of upsetting and drawing forging, the heating temperature is 1150℃~1180℃, the heating coefficient is 0.65~0.80, the forging ratio 1.7~2.0, air cooling after the completion of upsetting forging; the second fire upsetting forging, heating temperature 1080℃~1100℃, heating coefficient 0.60~0.75, forging ratio 1.8~2.0, air cooling after completion of upsetting forging. After forging at high temperature, the original as-cast structure of the billet can be fully broken, and a fine β-structure billet can be obtained;

[0024] The heating and holding time can be calculated by the heating coefficient. The empirical formula for calculation is: T=αD, where α is t...

Embodiment 1

[0036] 1) High temperature forging:

[0037] Ingot specification Ф720mm, ingot β phase transition point 990°C, billet unit weight 950kg, billet opening heating temperature 1170°C, heating coefficient 0.65, elongation + upsetting + elongation forging process, forging ratio 1.75, upsetting reduction Speed ​​15mm / s, air cooling after forging; reheating temperature 1080°C, heating coefficient 0.60, upsetting + elongation + upsetting + elongation forging process, forging ratio 1.85, air cooling after forging. Guarantee that the original as-cast structure is fully broken, and obtain a billet with a fine β structure.

[0038] 2) Low temperature forging:

[0039] Forging at a temperature lower than the β phase transition point of 35°C, that is, the temperature is set to 960°C, and the heating coefficient is 0.7. This fire adopts the process of continuous return to the furnace for upsetting + drawing + drawing, the ratio of upsetting and drawing is 1.65, and the hot material is return...

Embodiment 2

[0049] 1) High temperature forging

[0050] Ingot specification Ф720mm, ingot β phase transition point 995°C, billet unit weight 970kg, billet opening heating temperature 1150°C, heating coefficient 0.75, adopting elongation + upsetting + elongation forging process, forging ratio 1.8, upsetting reduction The speed is 15mm / s, the reheating temperature is 1090°C, the heating coefficient is 0.65, upsetting + elongation + upsetting + elongation is adopted, and the forging ratio is 1.9 to ensure that the original cast structure is fully broken and a fine β structure blank is obtained.

[0051] 2) Low temperature forging

[0052] Forging at a temperature lower than the β phase transition point of 30°C, that is, the temperature is set to 965°C, and the heating coefficient is 0.6. This fire adopts the continuous re-furnace upsetting and drawing + elongation process, the upsetting-drawing ratio is 1.7, and the hot material is returned to the furnace for 100 minutes. Air cooling after ...

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Abstract

The invention relates to a preparation method of a TC4 titanium alloy thin-wall high-barrel ring piece or pipe forging. The preparation method comprises the steps of high-temperature forging, low-temperature forging, blank pipe preparation and low-temperature forming forging. According to the preparation method, a traditional technological scheme of free forging and multi-heating-number forming of the thin-wall high-barrel ring piece is abandoned, blank forging of a high temperature section and a low temperature section is adopted, a radial forming technology is adopted, and refining uniformity of the structure of the forging and the consistency of the forging process are effectively achieved.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal processing, and in particular relates to a method for preparing high-performance TC4 titanium alloy thin-walled high-tube rings or pipe forgings suitable for aviation and aerospace. Background technique [0002] TC4 titanium alloy rings are mainly used to make flanges, shells, sealing gaskets, etc. Large rings can also be used as engine drums, or processed into discs. Usually we say that the ring forging has an outer diameter much larger than the height, and is generally formed by free forging or rolling with a ring rolling machine. The feature of the ring prepared by this preparation method is that the height dimension is larger than the outer diameter dimension, and the wall thickness is thinner, similar to the forgings of cylinders and pipes, referred to as thin-walled high cylinder rings. Free forging single-piece forging is adopted. Since the titanium alloy forging process requires high fina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/76B21J5/00
CPCB21K1/761B21J5/002
Inventor 王晓亮孟康李少强雷锦文王涛张小航陈海生杜予晅刘向宏
Owner 西部超导材料科技股份有限公司
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