BACK PRESSURE DEVICE FOR PROGRESSIVE DIE APPARATUS, AND PROGRESSIVE DIE APPARATUS PROVIDED THEREWITH.

摘要

[Problem] To generate appropriate back pressure when an iron-core sheet is punched out while preventing the iron-core sheet from being pushed up by a simple configuration in a back pressure device for a progressive die apparatus. [Solution] A back pressure device (6) for a progressive die apparatus is provided with: a receiving base (31) which is ascendably and descendably provided in an iron core holding member for holding an iron-core sheet (2) punched out from a belt-shaped steel sheet (W) in a progressive die apparatus (1) and on which the iron-core sheets (2) are sequentially mounted; a support unit (32) for supporting the receiving base; an ascent/descent motor (33) for performing the ascending and descending motion of the receiving base via the support unit; and a control device (34) for controlling the rotation motion of the ascent/descent motor. The control device is configured to set a plurality of torque limit values for limiting the output torque of the ascent/descent motor according to the motion of the progressive die apparatus, and when the iron-core sheet is punched out, limit the output torque on the basis of the maximum torque limit value among the plurality of torque limit values.