| 摘要 |
PURPOSE:To make high-precision and high-speed machining performable, by setting the thickness of a zinc or zinc alloy covered layer to a range of 0.5-4mum, and forming an interface between a core and the covered layer into smoothness enough. CONSTITUTION:Thickness of a zinc or zinc alloy covered layer is made so as to be set to a range of 0.5-4mum. This is because if thickness is less than 0.5mum, consumption of zinc is little but improvement in a machining speed is almost nothing, and if it is less than 4mum the other way, the consumption of zinc unduly grows larger and, what is worse, machining accuracy is lowered. Likewise, if irregular surfaces exist on an interface between a core and the covered layer, irregular surfaces of this core are exposed due to consumption of the zinc whereby machining is not uniformized, thus surface roughness turns worse. Therefore, electroplating, not a mechanical process, is carried out so that it is smoothable in this way. With this constitution, performance for high- precision and high-speed machining is improvable.
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