Die cushion control device

Details Die cushion control device Die cushion control device

2011-04-05

2011-04-05

Ross, Dana (Department: 3725)

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

C072S350000, C072S016100

Reexamination Certificate

active

07918120

ABSTRACT:
A die cushion controller controls an ascending/descending speed of a die cushion pad based on a preset pressure pattern and positional pattern. A position/pressure control switching unit constantly monitors and compares a first speed command signal υpc corresponding to a pressure deviation signal ep and a second speed command signal υhc corresponding to a position deviation signal eh, and selects a smaller one of the speed command signals to be sent to a speed control unit.

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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/JP2008/304858, 4 sheets.

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