Roll forming machine

Abstract

The purpose of the present invention is to simply and rapidly perform replacement operations for horizontal rolls within a horizontal roll stand, including readjustment of reduction amount. To achievethis, a horizontal roll stand 10, which has an upper and lower pair of built-in horizontal rolls 11, can be retracted to one side of the forming line. A fixed stand 40 is arranged on the side of theforming line opposite from the retraction, and a reduction device 43 for imparting reduction force to the horizontal rolls 11 is provided in an overhanging part 42 for the fixed stand 40 jutting out above the forming line. The horizontal roll stand 10 has a horizontal roll housing 12 that is open at the top, and receives reduction force from the reduction device 43 via that open upper part and isretracted to the outside of the forming line leaving the reduction device 43 above the forming line. The overhanging part 42 of the fixed stand 40 is mated with the horizontal roll housing 12 of the horizontal roll stand 10 within the forming line and supports the horizontal roll housing 12.

Description

technical field [0001] The present invention relates to a roll forming machine used in the manufacture of welded pipes, and more specifically, to a roll forming machine which facilitates roll replacement work and is excellent in economical efficiency. Background technique [0002] In a production line of welded pipes such as electric welded steel pipes, in the process of passing a strip-shaped metal plate through a plurality of roll forming machines arranged along the forming line, the metal plate is formed into a tubular shape, and the butt edges are welded to form a welded pipe . In such a pipe production line, the forming rolls assembled on the roll stand in the roll forming machine are replaced according to the pipe size. Here, the exchanging operation of forming rolls is required to be performed quickly, and Patent Document 1 proposes a roll forming machine that satisfies this requirement. [0003] The roll forming machine proposed in Patent Document 1 has the followi...

AI Technical Summary

Problems solved by technology

However, since the upper and lower horizontal rollers are in a cantilevered state through the operation side portion of the base frame when the base frame is separated, it is necessary to increase the rigidity of the base frame, which inevitably leads to an increase in size and cost. are limited to rollers with relatively small diameters such restrictions

In addition, the complication of the machine base structure due to the division of the machine base frame cannot be avoided

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