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Developement of SPF and SPF/DB Techniques for Ti and Al Alloys and their Applications

  • Ji Wenhai (a1), Wang Zhenguo (a1) and Song Feiling (a1)

Abstract

This paper deals with the new development of both SPF of an Al alloy and SPF/DB of an Ti alloy.

Based on a theoretical model, a pressure versus time curve was determined for optimizing the SPF parameters. The effects of applied back pressure and reverse billowing on the performance of 7475 and Al-Cu-Li-Mg-Zr alloys are discussed.

Some essential technological factors which affect the quality of the SPF/DB of the Ti-6A1–4V alloy have been studied, such as the effect of an o layer on the strength of the base metal, the gas filling method and the pre-forming of parts with curved surfaces etc. Examples of applications to the manufacturing of airplane spars and undercarriage doors are also shown in this paper.

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References

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1. Zhenguo, Wang, Song feiling and Wu uring Technology, No. 2, 28 (1990)
2. Laycock, D.B., Superplastic Formin Proc. Conf., 257 (1982)
3. Bampton, C.C., Ghosh, A.K. and Mahoney, M.W., Superplastic Aerospace-Aluminium, Proc. Conf., 67 (1985)
4. Willamson, J.R., Welding Technology for the Aerospace Industry, Proc. Conf., 55 (1980)
5. Agrawal, S.P., Weisert, E.D., Manufavturing Engineering Transactions 7th North American Metalworking Research Conference proceedings, 197 (1979)
6. Baoren, Wang and Wenhai, Ji, Acta Aeronautica Et, Vol.10, No.6, B309 (1989)

Developement of SPF and SPF/DB Techniques for Ti and Al Alloys and their Applications

  • Ji Wenhai (a1), Wang Zhenguo (a1) and Song Feiling (a1)

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