Development of Die Cushion Device for Press with Frictional Force

摘要

A factional force is generated by sliding between metal portions of a shaft part and a hole part having an interference, and such a frictional force is used as a die cushion force of a press. In this way, a die cushion device can be downsized. In addition, since the frictional force calculated from the interference 8 matches the actual measured frictional force in a test, it is possible to acquire the desired frictional force by managing a dimension of the interference. We conducted a reciprocal sliding experiment for 600,000 times and could consequently acquire the constantly stable frictional force and constantly stable temperature transition of sliding portions. Furthermore, no wear was found in an outer diameter of the shaft part and an inner diameter of the hole part after the experiment. Therefore, we were able to prove high durability and long life of the die cushion device.