超塑性成形技術を利用したチタン合金製腕時計用外装の開発

概要

論文の詳細を見る
Titanium alloy is suitable to the watchcase as it is light weight and has superior features in the strength, thermal resistance, corrosion resistance, and fitness to human body, however, it has not been used so far because of its inferior forgeability. In order to improve the forgeability, superplastic forging method has been developed, however, this method is not efficient as it takes a long time and therefore it has lower productivity as compared with the usual forging method. Newly developed superplastic forging method with multichangeable speed is introduced in this paper. This method consists of two steps, high speed forging step and low speed one that follws, and in the latter step superplasticity of the alloy is revealed. This method allows the maker to produce titanium alloy products at a high productivity and makes it possible to use the alloy for watchcase.
社団法人日本時計学会の論文
1991-03-20