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Title:
BACK PRESSURE DEVICE FOR PROGRESSIVE DIE APPARATUS, AND PROGRESSIVE DIE APPARATUS PROVIDED THEREWITH
Document Type and Number:
WIPO Patent Application WO/2015/132814
Kind Code:
A1
Abstract:
[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.

Inventors:
HORII HIDEO (JP)
SHINDO KENICHI (JP)
Application Number:
PCT/JP2014/001175
Publication Date:
September 11, 2015
Filing Date:
March 04, 2014
Export Citation:
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Assignee:
KURODA PRECISION IND LTD (JP)
International Classes:
B21D28/02; H02K15/02
Domestic Patent References:
WO2011053258A12011-05-05
Foreign References:
JP2001096319A2001-04-10
JP2011073047A2011-04-14
JP2006035267A2006-02-09
JP2005334893A2005-12-08
EP0042046A11981-12-23
Other References:
See also references of EP 3115121A4
Attorney, Agent or Firm:
OSHIMA & PARTNERS (JP)
Patent business corporation Oshima patent firm (JP)
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