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In this study, a servo motor controller having only the mutually exclusive switching function between velocity and force control is used to set up a servo mechanical die cushion to explore the technology of force control that can enable the cushion to obtain the pre-acceleration function. Under different torque settings of the servo motor, the final velocity and the travel stroke of the die cushion for a certain time duration have been investigated for each response surface. A design scheme to determine the setting parameters for the pre-acceleration of the die cushion, such as the torque and the time duration, in which its both response surfaces of the velocity and the stroke are used, is thus proposed and verified by examples. The results show that the design scheme is indeed feasible and would be available for corresponding technicians’ reference.

Study on pre-acceleration characteristics of servo motor applied on stamping die cushion