Development of the Elongation-Control Mill and Its Application to Flat-Wire Rolling Development of Elongation- Control Rolling I

摘要

A novel continuous tandem rolling technique,elongation-control rolling, is proposed. The aim is to control theelongation or the lateral spread of a workpiece during rolling toachieve size-free rolling, a rolling technique usable with aworkpiece of any size. The elongation is controlled by interstandforce, which varies widely from tensile to compressive. Aprototype five-stand mill was constructed. Flat-wire rollingexperiments were conducted using commercially pure roundaluminum bars. Interstand forces were generated by changingthe roll speed ratio of the stands. The limits of interstand forceto achieve stable rolling operation were clarified. The tensionlimit is due to the slipping of rolls on the workpiece, while thecompression limit is due to the buckling of the workpiecebetween stands. It has been clarified that elongation of theworkpiece can be controlled to be a great degree. Compressiveinterstand force decreases the elongation and increases the lateral spread.