Numerical Simulation Analysis on the Ten Cross Rolls Straightening Process of the Heavy Calibre Seamless Steel Tube

Abstract

The size and roundness tolerance are common defects of the heavy caliber seamless tube after rolling and heat treatment. In order to disclosure the straightening mechanism of the heavy caliber seamless tube with ten cross rollers straightening machine, a nonlinear finite element model was set up on the platform of MSC.MARC. In this model, a heavy caliber seamless tube of Φ750 × 37 mm with initial roundness tolerance was used. The simulation results show that, the roundness tolerance declined from 1% to 0.2% after straightening, so that the initial roundness tolerance was almost eliminated. And the strain and stress distribution of the tube, the straightening force fluctuating caused by the roundness tolerance were presented and discussed. The analysis results obtained may provide a theoretical foundation not only for establishing the straightening process, but for the machine structure designing.