Continuous rolling mill sequence for mfg. I=beams - using numerous passes through grooved horizontal and vertical rolls, and universal rolling mills

摘要

The initial billet has a rectangular cross-section, and is fed through stands contg. horizontal rolls provided with profiled grooves, and universal mills. After 1-3 passes between grooves horizontal rolls, the workpiece is fed through vertical upsetting rolls. The horizontal mills pref. use a shape alteration coefft (SAC) of 1.1-1.25 on the web, 1.05-1.35 on the flange thickness, and 1.03-1.25 on the flange height-whereas the vertical upsetting rolls pref. use an SAC of 1.15-1.65. One pref. mill train uses a roughing sequence of eight passes, followed by a finishing sequence of six passes. easy entry and exit of the workpiece w.r.t. all the rolling grooves, is achieved, so the working life of the rolls and their inlet and exit guides is increased. (10-p).