Method for controlling a hydraulic rotary and feed drive for a cold pilger rolling mill
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Dec 23, 1998
priority date (Note) -
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Abstract
The invention relates to a method for controlling a hydraulic rotary and feed drive for a cold pilger rolling mill for producing rolling stock, the cold pilger mill having a rolling stand that moves back and forth in the rolling direction by a crank drive so that rolls of the roll stand, which are of tapering design, roll over the rolling stock with an alternating sense of rotation. The roll stand intermittently releases the rolling stock so that the rolling stock may be rotated and fed by the hydraulic rotary and feed drive to a new position as a function of the position of the crankshaft of the roll stand. The rotation and feeding of the tube are performed by hydraulic motors controlled by pressure medium and assigned to the drive members acting on the tube. The pressure medium feed of each hydraulic motor is controlled by a proportional valve which is opened for a time interval proportional to a path required for the drive member moved by this hydraulic motor.
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