Die cushion controlling apparatus and die cushion...

Details Die cushion controlling apparatus and die cushion... Die cushion controlling apparatus and die cushion...

2005-06-14

2008-08-05

Banks, Derris H. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S021500, C072S453130

Reexamination Certificate

active

07406851

ABSTRACT:
A die cushion controlling apparatus for controlling an operation of a cushion pad, which comprises a pad drive mechanism for driving to raise or lower the cushion pad while applying an upward energizing force, a load measuring unit for measuring a load generated in the cushion pad, a time detecting unit for detecting a generating time and a vanishing time of the load, and a control unit for controlling the pad drive mechanism so that a load measured value measured by the load measuring unit follows a preset load pattern during a period from when the time detecting unit detects the generating time of the load until when the time detecting unit detects the vanishing time of the load.

REFERENCES:
patent: 4945742 (1990-08-01), Schoch
patent: 5299444 (1994-04-01), Kirii et al.
patent: 5435166 (1995-07-01), Sunada
patent: 5687598 (1997-11-01), Kirii et al.
patent: 2005/0262915 (2005-12-01), Baba
patent: 10-202327 (1998-08-01), None

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