| 摘要 |
PURPOSE:To prevent generation of burrs, and to make the thickness of a contact metal uniform, by treating under heating a prism-shaped composite contact material in a nonoxidizable atmosphere of a prescribed temperature, before forming said material and finishing it to a rivet die. CONSTITUTION:For instance, a prism-shaped composite contact material 2 is manufactured by cutting a composite contact bar material 1 which has clad a contact metal 1b on both the upper and lower surfaces of a base metal 1a, and furthermore has clad a contact metal 1c on both its upper and lower surfaces. Subsequently, this contact material 2 is treated under heating at a temperature of 300-500 deg.C in a nonoxidizable atmosphere. Subsequently, preliminary forming is executed by collapsing the upper half part of the contact material 2, and thereafter, it is finished and formed to a rivet die. |
