Die cushion controller

Details Die cushion controller Die cushion controller

2006-03-13

2010-06-22

Tolan, Edward (Department: 3725)

Metal deforming

With means to drive tool

Including screw-actuated tool support

C072S453130

Reexamination Certificate

active

07739894

ABSTRACT:
Provided is a die cushion controller that controls an ascending/descending speed of a die cushion based on a predetermined pressure pattern56.The pressure pattern56has a low pressure target value PL which is first followed by an increased cushion pressure, a high pressure target value PH corresponding to a requisite cushion pressure for retaining a workpiece, and a complementary target value PC which is followed by the cushion pressure at a substantially linear increase rate for a predetermined period of time T2until the cushion pressure exceeds the low pressure target value PL and reaches the high pressure target value PH. The cushion pressure overshooting the low pressure target value PL continues to follow the complementary target value PC, so that an overshooting amount occurring at a time point at which the cushion pressure reaches the high pressure target value PH can be reduced. As a result, pressure variation in the cushion pressure can be suppressed.

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Notification Concerning Transmittal of International Preliminary Report on Patentability, Chapter I of the Patent Cooperation Treaty, and Written Opinion of the International Searching Authority, dated Sep. 18, 2007 for PCT/JP2006/304859, 4 sheets.

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