Coining of micro Structures with an electromagnetically driven Tool

Abstract

For coining micro structures into high-grade steel 1.4301 a highly dynamic tool system based on a pulsed magnetic field inside a cylindrical coil was developed. Two kinds of structures were coined at different tool velocities. The coining results were evaluated regarding geometrical accuracy, material flow behaviour and energy input. In addition the high velocity process was compared to a quasi-static process. By increasing the coining velocity to 30 m/s the accuracy of the quasi-static process can be reached. The energy that is needed for reaching a similar result is less for coining at high velocities. The tool velocity also influences the flow behaviour of the workpiece material.