High-speed blanking of an amorphous alloy

An amorphous foil of 28 μum in thickness has been blanked at various blanking speeds, ranging from 0.06 m/s to 15 m/s. A mechanical press is used for the range of 0.06–0.22 m/s, and an electromagnetically actuated press for the higher range of up to 15 m/s. The clearance has been changed also, between 1.0 μum and 5.0 μum. The effects of blanking speed clearance and number of blankings on the blanked surface have been investigated. Furthermore, crystallization of the blanked surface has been examined with the use of the electron beam diffraction method. Crystallization has been found to take place mainly at the burnished area, very little being found at the fractured area and the vein-pattern area.