Transient characteristics of D-C metal-rolling motors and generators

THE ADVANCE in metal-rolling techniques during the past two decades has been tremendous. The delivery speeds of tandem cold mills have increased from 3,500 to more than 7,000 feet per minute. The reversal time (base speed to base speed) of electric-driven blooming and slabbing mills has been reduced from 2 seconds to less than 1 second with a resultant increase in output. Rod and tube mills have been greatly improved which has resulted in higher quality and a reduction in scrap.