Study of Squeeze Effect and Worm of Rollers Affecting the Inverse Bending on Straighten Steel Pipes

Abstract:

In the manufacturing process of steel pipes, bending or torsion deformation is most usual happened by the variation of temperature, external extension or compression, inner residual stress. The straighten quality is thus out of standard. Tilt roller straightens machine is thus become required equipment in the straightening process. Rollers can generate vertical and radial bending continuously in order to achieve enough straightness. These two direction bending moments have to good match each other. Quality problems, such as surface wear scar, sink in or shorten the length, can thus be avoided. Curve geometry of rollers, squeezing effect and straighten inverse bending moment calculation were considered in the study. Optimal bending stress cannot be lower than 70 % yielding stress and contacting length between roller and pipe cannot be lower than 65% curve length of the roller. The worm of rollers affect contact situation and the tilt angle of roller have to rearrange.

• Periodical: Key Engineering Materials (Volume 823)
• Pages: 145-150
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.823.145
• Online since: September 2019
• Authors: I Chuan Lu, Chin Chung Wei*
• Keywords: Pipe Bending, Squeeze, Straighten, Wear of Roller

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