超塑性Zn-Al系合金の腕時計用文字板への応用

概要

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Superplastic Zn-21% Al- O.5% Cu-0.01% Mg alloy (SPZ) was applied to a one-piece watch dial which combined indexes, markings, hairline-like surface relief and feet. Two watch dial forming processes were developed in super plastic isothermal conditions. 1 Load and un-load cyclic forging process. 2 Constant load holding process. This forming cycle combines an approach at constant speed followed by a dwell at constant load. The results were obtained as follows 1) The one-piece watch dial formability was increased by the number of load and un-load cycles at the cyclic forging and holding time of constant load. 2) The formed one-piece watch dial has been exhibited good face and high accuracy for 1.5 years.
社団法人日本時計学会の論文
1983-03-25