Breakage mechanism and application of the bottom main drive spindle in a R2 roughing mill during hot rolling by finite element analysis;

The screwdown system of four-roll reversing roughing mill in Tiangang Group requires high control precision, the speed control of screwdown motor is the key factor.

In hot rolling process,reheating furnace and roughing mill are controlled separately in general,and as a subsequent equipment of reheating furnace,roughing mill can not feed useful rolling information back to reheating furnace in time,so that reheating furnace can not heat slabs according to the requirement of roughing mill.