外加轧辊辊端长时间磨损过大，易造成辊身端部局部过载，引发裂纹的产生。
Excessive wear profiles due to long campaigns cause localised overloads at the barrel ends which favour the initial crack.
特点：功放带压限、过载、过流保护，大型散热器保证设备长时间的稳定工作。
Characteristics: that amplifier take to press, over carry, protect over the electric current, and the large have fever the fan to add the stability work to guarantee the equipments long time.
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