A ragging mechanism is added to the common C8463A roll lathe, and PLC is adopted mainly to carry out electric control, and then the ragging can be nicked on the bottom of the pass of 500mm rolling mill roll.

Through adjusting its main process parameters,such as entrance temperature,rolling speed,reduction rate and lubrication,using high speed steel rolls and keeping excellent roll surface,the hot rolling sticking could be improved obviously and the roll marks could be avoided.