Process for cold rolling of tubes by means of a pilger mill and device for using the process
AssigneeVallourec
InventorPierre Peytavin
Life of this patent
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Abstract
The process and the device which are the object of the invention relate to the cold rolling of tubes by means of a Pilger mill. The tube blank is made to advance near each of the upstream and downstream dead centers reached by the roll stand during its forward and return cyclical movement and backward movement of the rear part of the blank is made possible during a return pass of the roll stand. This process makes possible a doubling of production without changing the operating rate of the roll stand.
Claims15
A process for cold rolling of tubes utilizing a Pilger mill, a roll stand and a blank, which comprises:
- driving said roll stand with a forward and return cyclical movement;
- advancing the blank near each of upstream and downstream dead centers thereof;
- and
- rolling said blank during a return pass of said roll stand wherein a rear part of said blank is moved backwards during rolling performed during said return pass of said roll stand.
A device for cold rolling of tubes, comprising:
- a Pilger mill having a roll stand;
- means connected to said roll stand for driving said roll stand under a forward and return cyclical movement, said forward and return cyclical movement having respective upstream and downstream dead centers;
- means located on said mill for controlling the advance of a tube blank near the upstream and downstream dead centers, said means for controlling being operatively connected to said means for driving and having cam means whereby said cam means makes one revolution during the forward and return movement of said roll stand;
- and
- drive means associated with said means for controlling, said cam means having first and second diametrically opposite bosses for acting on said blank through said drive means, said first boss acting on said blank when said roll stand is near the upstream dead center and said second boss acting on said blank when said roll stand is near the downstream dead center.
Dependencies are inferred from the claim text.