チタン製腕時計の加工設計

概要

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Manufacturing design should be performed by means of material selection and deformation property control using structure adjustment. Along this manufacturing design, the following three technologies have been developed. 1) Precipitation period has been reduced from 24 hours down to 5 hours by means of the two stage precipitation method, first at 573K and next at 773K. By use of Ti-15% V-3% Cr-3% Sn-3% Al(15-3), a good wearing resistance for 1.5 years has been accomplished for the watch case. 2) Portable superplastic forging system using impulse control has been developed. Diver type watch case has been manufactured by the superplastic forging under constant load at 1073K, by use of Ti-4.5% Al-3% V-2% Fe-2% Mo(SP700). 3) The mirror polished surface similar-looking to hard alloy has been obtained by use of fine grain2 to 3μm in size range.
社団法人日本時計学会の論文
1995-12-25