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Development of a Titanium Material by Utilizing Off-Grade Titanium Sponge

Article of Honda R&D Technical Review Vol.14 No.1

Summary

A titanium alloy for forging and a pure titanium material for exhaust systems have been developed for the purpose of reducing the weight of a motorcycle frame and improving the engine performance. A feature of the material is the use of off-grade titanium sponge that includes many impurities for production of titanium ingot. Stable characteristics have been obtained by controlling oxygen equivalent after setting the volume of tolerable impurities by considering mechanical properties and productivity. In spite of low-cost, this material design provided the same design strength compared to the conventional material, and enabled production with existing equipment. Using this new material and changing the manufacturing and surface treatment process enabled us to provide titanium parts at a lower cost. This technology is a fundamental one for producing titanium raw material for motorcycles and automobile applications, and it is expected to apply to other titanium alloys.

Reference

(1) Horiike, T. et al, Introduction to Exhaust Emission Reduction Technologies of VFR800FI, HONDA R&D Technical Review Vol. 10, pp. 42–48 (1998)
(2) Tsukui, T. et al: Development of the directory Activated Variable Valve Control System, SAE Paper 1999-01-3319
(3) Kato, T.: PPC Furnace Development and Equipment, Titanium and Zirconium, Vol. 32, No. 2, p. 96 (1984)
(4) Yamada, H.: Electric Steelmaking, Vol. 54, No. 1, p. 53 (1983)
(5) Japan Titanium Association Journal, World of Titanium, p. 27
(6) Hagiwara, Y. et al: Lightweight Titanium Connecting Rods for Motorcycles, HONDA R&D Technical Review, Vol. 2, pp. 229–237 (1990)
(7) Titanium Association Journal: Titanium Processing Technologies, p. 71
(8) Nippon Society of Plastic Manufacturing Journal, Press Manufacturing Process Design and Die Design, Corona Publishing Co., Ltd., p. 16

Author (organization or company)

Yuji MARUI(Asaka R&D Center)、Toyotaka KINOSHITA(Asaka R&D Center)、Kyo TAKAHASHI(Asaka R&D Center)

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