Automatic control method of roll type pipe correction machine

Abstract

Automatic control method of a roll type pipe correction machine producing a stabilized correction effect. At the time of correcting a pipe by crushing it by means of a straightener equipped with three or more stands each having a pair of hole type rolls, automatic control of first through fourth steps is carried out. First step: the relation between a set value of the offset amount and the bending amount of a pipe measured on the exit side of the correction machine is calculated previously. Second step: the bending amount of the pipe is measured on the exit side of the correction machine. Third step: when the bending amount measured in the second step is out of a target range, a variation of the offset amount for limiting the bending amount of the pipe on the exit side of the correction machine within the target range is calculated according to the relation calculated in the first step. Fourth step: a set value of the offset amount at the time of correcting the next pipe is determinedaccording to the variation of the offset amount calculated in the third step.

Description

Automatic Control Method of Roller Tube Straightening Machine technical field The present invention relates to an automatic control method of a roller pipe straightening machine for straightening steel pipes and the like, and particularly relates to an automatic control method of a roller pipe straightening machine capable of obtaining stable straightening effects. Background technique Pipes manufactured by various pipe manufacturing methods are subjected to various treatments and finished in order to obtain predetermined quality. The straightening step is one of the finishing steps, and its purpose is to eliminate the bending of the manufactured pipe to make it straight, and to change the outer shape of the pipe from an ellipse to a perfect circle. As shown in FIG. 1 , a generally used roller tube straightening machine (straightening machine) includes three or more rolling mills provided with a pair of facing grooved rolls R, R. The roller tube straightening machine mak...

AI Technical Summary

Problems solved by technology

Since the offset amount and rolling amount are manually set based on the experience and intuition of the operator as described above, the correction effect is still unstable.

Images