After installing the cemented carbide roll rings on line,carefully check the cooling water pipe and the roll rings'position.Then,connect the inlet hose to the special water pipe.Ensure the inlet is securely fastened after connection to prevent it from detaching.This precaution is vital to avoid serious consequences,such as roll ring blast due to inadequate cooling.
Water cooling of cemented carbide rolls is a very important in the process of rolling,the better cooling condition will bring the higher rolling tonnage,otherwise the roll rings groove will tend to crack.Therefore,check whether the cooling water is normal before rolling test.In the rolling process,the production shift should stop every 4hours to check whether the position of the special cooling water pipe is moved,whether the water pipe nozzle is blocked,and then start rolling.
In order to ensure the roll rings cooling water volume,water quality and water pressure,it is recommended that the water pipe of the mills be connected from the control cooling water pipe,and the water pressure gauge and water pressure alarm device be installed.In case of alarm,stop rolling immediately and start rolling after the water pressure is adjusted to normal range. Operators should ensure that the pressure of the special cooling water pipe for finished rolling mills is within the range of 0.4-0.6Mpa.If beyond the range,adjust the water pressure to the above range as required.
During the rolling process.it is necessary to pay close attention to the running state of the bearing seat and stop rolling immediately if any abnormality is found.
During the shift,the operator shoud carefully check the wear of the rolling rings groove to see whether there are microcracks.If so,report shall be made to the dispatcher and quality inspector,and then replace the rolling rings groove after confirmaton.
The adjustment of rolling rings gap shall not be seamless in the rolling process,that is,can not stick rolls rolling
Once abnormal rolling products are found in the sampling room,stop the rolling machine immediately to check it.If the screw is loose,the groove has microcracks and other phenomena,the groove and roll rings need to be replaced.
When the rolling material surface is abnormal(such as the rolling material surface trace caused by microcracks in the rolling groove),the groove or roll rings shall be changed in time.
During the rolling process,it is necessary to prevent the axial fracture of cemented carbide roll rings caused by bearing overheating.
In the process of using the roll,if the water is stopped or the position of the water pipe is shifted,stop the rolling machine immediately to avoid burning out of the roll groove,cracking and dropping blocks,etc.
The rolling tonnage of single groove is determined according to the actual situation(the reasonable rolling tonnage varies with the different rolling conditions),and it shall be strictly followed according to the rated tonnage.Excessive rolling is strictly prohibited to avoid cracking in the roll.
In the case of stuck steel and piled steel,the roll rings should continue to be cooled and the upper roll shall be quickly lift.The water can not be cut off until the temperature of the rolled piece decreases.
It must be stopped immediately to remove the roll and allow it to cool slowly (naturally)if the roll runs for aperiod of time without cooling water due to accidents,and it can be put into use after cooling or regrinding.Note that pouring cooling water directly onto the roll will cause the carbide roll rings to burst.
Contact: cykc@cykcgroup.com.cn
