| 摘要 |
PURPOSE:To prevent the generation of exfoliation of zinc oxide film by forming a film consisting of at least 50% zinc oxide and applying varnish containing resin onto the surface of a Cu-Zn group alloy core member. CONSTITUTION:Onto the surface of a Cu-Zn group alloy core member 1, a film 2 consisting of at least 50% zinc oxide in the composition excluding carbon and organic substances in film and a film 3 made of varnish or paint containing resin are applied in this order. As for the Cu-Zn group alloy wire having the film consisting at least 50% zinc oxide in the composition excluding carbon an organic substances in film, the max. working speed under a various sorts of electric discharge machining conditions can be improved by 20-30% or more in comparison with the case of the normal brass wire. When the varnish or paint film is formed, lubricity is improved, and frictional coefficient is reduced, and therefore, the generation of exfoliation of zinc oxide film is prevented. |
