一、绪言一般在轧制金属和合金板时会发生各种裂纹,而这些裂纹按其形状大致分为张嘴、裂边和内裂。其中张嘴和内裂裂纹性质不能进行轧制,但裂边并没有这么大危害,它是轧制一般金属板材过程中可以清楚看到的现象。然而可造成如下的不良影响:降低成品率、由于压入裂屑,使板材表面损坏、在轧制过程中附加张力引起板断等。对这种裂边的防止方法有:把整个轧制材料用包复层包复起来进行轧制的包复轧制法、在轧制材料边缘贴上变形量大的不同材料而进行轧制的粘贴边法、通过改良轧机,从侧面加以限制,来防止裂边的板边限制轧 I. INTRODUCTION Generally, various cracks occur when rolling metal and alloy plates, and these cracks are roughly divided into open mouth, split edge and internal crack according to their shape. One open mouth and cracked nature of the crack can not be rolled, but the crack is not so much harm, it is common in the rolling process of sheet metal can clearly see the phenomenon. However, the following adverse effects can be caused: the yield is lowered, the surface of the sheet is damaged due to the press-in of the crack, the tension is caused by the additional tension during the rolling, and the like. The method for preventing this crack is as follows: a clad rolling method in which the entire rolled material is cladded with a clad layer and rolled; a method of rolling the rolled material by applying a large amount of different material to the edge of the rolled material; Paste the edge of the law, by improving the mill, from the side to be limited to prevent crack edge of the limit rolling