Super-plastic forming/diffusion bonding forming method for large-curvature complex surface titanium alloy part

A complex profile, superplastic forming technology, applied in the field of sheet metal and thermal processing, can solve the problems of increasing the ejection and pressing device, increasing the production difficulty, increasing the production cost, etc., achieving high dimensional accuracy of components, reducing production costs, Highly designable effects

Active Publication Date: 2015-05-06
BEIJING HANGXING MACHINERY MFG CO LTD
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Problems solved by technology

[0004] For the forming of complex profiles with large curvature, when forming by ordinary hot stamping methods, it is required to increase the

Method used

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  • Super-plastic forming/diffusion bonding forming method for large-curvature complex surface titanium alloy part
  • Super-plastic forming/diffusion bonding forming method for large-curvature complex surface titanium alloy part
  • Super-plastic forming/diffusion bonding forming method for large-curvature complex surface titanium alloy part

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Embodiment Construction

[0026] Below, the invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0027] The titanium alloy part is a typical large-curvature double-layer structure part, and its shape and size are as follows figure 1 As shown, the outer layer is a 2mm thick titanium plate, and the inner layer is a 1mm thick titanium plate.

[0028] (1) Sheet metal preforming

[0029] Calculate the blanking size according to the external dimensions of the final formed part, and reasonably remove excess sheet material at the easy-to-fold parts, as follows figure 2 As shown, after forming without blank holder, the blank with no wrinkle on the surface can be obtained, and a reasonable gap for the subsequent welding process is reserved, and the positioning surfaces at both ends are reserved; the mold is as follows image 3 Put it into the thermoforming machine and raise the temperature to 800-820°C, put the inner and outer plates into the mold respe...

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Abstract

The invention relates to a super-plastic forming/diffusion bonding forming method for a large-curvature complex surface titanium alloy part and belongs to the field of metal plates and hot working. Through reasonably and accurately calculating the unfold size of a part, residual materials on the wrinkled region of the part are removed through cutting in advance, after pre-forming is completed, overall welding and hot shape correction are performed, and the pre-formed and welded part is placed in the same tool so that super-plastic forming/diffusion bonding forming can be performed on the part. Without the help of blank holder force, pre-forming and super-plastic forming/diffusion bonding forming are completed through the same tool, one-time hot forming of the large-curvature complex surface part is completed, the defect that the part is wrinkled and loses stability is overcome, and technology difficulty and tool structure complexity are lowered. The part formed through the method has advantages.

Description

technical field [0001] The invention relates to a superplastic forming / diffusion connection forming method for titanium alloy parts with large curvature and complex profile, which is suitable for precise forming of metal materials such as titanium alloys for aerospace, and belongs to the field of sheet metal and thermal processing. Background technique [0002] Superplastic forming / diffusion bonding is a process technology developed in the 1970s to form an integral structure, that is, SPF / DB technology. It uses a titanium alloy with a specific microstructure under appropriate temperature and pressure. It has the characteristics of large material elongation and good diffusion performance, forming an overall hollow structure. The disadvantages of titanium alloy machining can be avoided, the production cycle can be shortened, the manufacturing cost can be reduced, and the weight reduction effect is obvious; the structural integrity can be improved, and the degree of freedom of ...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K20/02B21D22/02B21D37/16
CPCB21D22/02B21D37/16B23K20/023B23P15/00
Inventor 李妍华李保永王猛团秦中环
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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