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research-article

AN EXPERIMENTAL STUDY FOR THE DEVELOPMENT OF MANDREL-FREE HOT-SPINNING FOR LARGE SIZE TITANIUM ALLOY PLATE FORMING

[+] Author and Article Information
Yoshihide Imamura

Material Research Department, Technical Institute, Corporate Technology Division, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi, Hyogo, Japan
imamura_yoshihide@khi.co.jp

Ken Ikawa

Material Research Department, Technical Institute, Corporate Technology Division, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi, Hyogo, Japan
ikawa_ken@khi.co.jp

Kojiro Motoyama

Material Research Department, Technical Institute, Corporate Technology Division, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi, Hyogo, Japan
motoyama_kojiro@khi.co.jp

Hayato Iwasaki

Material Research Department, Technical Institute, Corporate Technology Division, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi, Hyogo, Japan
iwasaki_ha@khi.co.jp

Takeo Hirakawa

Engine Production Engineering Department, Manufacturing Division, Aerospace Systems Company, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi, Hyogo, Japan
hirakawa_t@khi.co.jp

Hiroshi Utsunomiya

Professor, Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka, Japan
uts@mat.eng.osaka-u.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4041161 History: Received July 09, 2018; Revised July 24, 2018

Abstract

A mandrel-free hot-spinning was developed as a near-net-shape titanium alloy plate forming technique. In this work, a Ti-6Al-4V alloy conical product with a wall angle of 34 degrees and 170mm height was formed from a large size Ti-6Al-4V plate (890~920mm dia. x 30mm thick). The product was characterized metallurgically and mechanical properties were measured, and the shape of formed products was investigated. It was found that the mandrel-free hot-spinning is able to form a large size titanium alloy plate. Material properties including tensile strength and microstructure of the formed products satisfied the material specifications. Fatigue stress of the formed product was higher than that of the typical Ti-6Al-4V material. For a further improvement, a forming method using pre-formed material was proposed and which was successfully conducted with two types of preforms and found to be effective in the forming process.

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