Invention Grant
US09346095B2 Die cushion drive and method for operating a die cushion drive 有权
模具缓冲驱动装置及其运行方式

Die cushion drive and method for operating a die cushion drive
Abstract:
A die cushion drive includes a first pump, operated by a first electrical machine and at least one hydraulic cylinder having first and second chambers, with the first chamber in fluid communication with the first pump. A die cushion mechanically connected to the hydraulic cylinder. During a controlled movement of the die cushion, a pressure regulation and a preliminary control are active, with a second pump being coupled to a second electrical machine. During preliminary control, the second electrical machine is operated as a generator, with a first valve being used as an adjustment element of the pressure regulation.
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