Shell feed system for a cold pilger mill
AssigneeWean United, Inc.
InventorsHarry Calhoon Ledebur, Floyd William Diehl, Jr.
Life of this patent
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Abstract
A system for incremently and continuously feeding tubes between dies during a prescribed angle of rotation of a crank assembly in a cold pilger mill. As a main motor drives the crank assembly, a servo-motor, receiving a signal from a digital control unit, which receives a signal from a pulsating encoder associated with the main drive, operates to incremently advance a carriage and shell a controlled predetermined distance between the dies. A reversal of the servo-motor returns the carriage to the initial position in preparation to advance another shell.
Claims7
In combination with a cold pilger mill having repetitive cyclic periods of operation, an improved feed system for feeding a shell into the mill to be reduced thereby, comprising:
- feed carriage means,
- rotatable feed screw means for advancing said carriage means with a shell,
- a power means for rotating said feed screw means to both advance said carriage means from a starting position toward the mill and thereafter to return said carriage means after completing its forward travel.
- means for producing a signal representative of the cyclic operational characteristics of the mill, and
- control means for receiving said signal and employing it to control the operation of said power means so that said power means drives said screw means during the forward travel of said carriage means to feed the shell into said mill and for thereafter rapidly returning said carriage means to its starting feed position,
- said control means includes means for causing said power means to operate to advance the shell at variable pre-selected lengths or rates of feed.
Dependencies are inferred from the claim text.