| 摘要 |
PURPOSE:To facilitate the manufacture of an outer casing component for a wrist watch made of a super hand alloy, by brazing a component made of a stainless alloy to an outer casing for the wrist watch made of a TaC super hard alloy. CONSTITUTION:A screw bush 4 made of SUS 316 F, a stainless alloy, is brazed to an outer casing frame 3 of TaC, and a back cover 6 is fixed to this screw bush by a screw 7 through the intermediary of an O ring 5 for waterproofing. The outer casing frame made of a TaC super hard alloy and the screw bush made of SUS 316 F are plated with Ni beforehand, assembled, and brazed in the ambience of vacuum of 10<-4> Torr or more. |
