METHOD FOR OPERATING A HYDRAULIC PRESS, AND HYDRAULIC PRESS
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United States of America Patent
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Mar 26, 2015
app pub date -
May 7, 2013
filing date -
May 10, 2012
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Abstract
A hydraulic press and a method for operating the press in cycles. The aim is to lower energy consumption in a hydraulic press for shaping workpieces and a method thereof. Each cycle has at least one phase in which the storage pressure pS in the accumulator presses hydraulic fluid into a chamber of a hydraulic cylinder in order to move a ram relative to the cylinder, the ram being coupled to the cylinder. In at least one portion of each cycle, a hydraulic pump driven by a motor delivers hydraulic fluid to the accumulator at a charging volume flow rate. The storage pressure pS is adjusted to a reference value PSOLL by setting the speed of the motor to a nominal motor speed nN and to at least one intermediate value nZ, where 0
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