Die cushion force control method and die cushion apparatus

摘要

A die cushion force control method and a die cushion apparatus generates a die cushion force on a cushion pad based on a die cushion force command value set in advance. A die cushion force command value equal to or larger than a target die cushion force command value is outputted initially in order to suppress an initial die cushion force overshoot generated when the target die cushion force command value configured to be stepwise is used as the die cushion force command value, then a die cushion force command value decreased continuously (gradually) so as to be smaller than the target die cushion force command value is outputted, and subsequently a die cushion force command value increasing gradually so as to be equal to the target die cushion force command value is outputted.

主权项

1. A die cushion force control method that outputs a predetermined die cushion force command value and generates a die cushion force on a cushion pad based on the die cushion force command value, the die cushion force control method comprising:
initially outputting a die cushion force command value equal to or larger than a target die cushion force command value in order to suppress an initial die cushion force overshoot generated when the target die cushion force command value configured to be stepwise is used as the die cushion force command value; then outputting a die cushion force command value decreased continuously or stepwise to be smaller than the target die cushion force command value; and subsequently outputting a die cushion force command value increasing continuously or stepwise to be equal to the target die cushion force command value.