（1）轧辊直径对宽展的影响

(1) effect of roll diameter on spread

在其他条件不变的情况下，随着轧辊直径的增加，变形区长度增加，宽展值相应加大。

In the case of other conditions unchanged, with the increase of roll diameter, length of deformation zone increases, increased the value of spread.

（2）轧件宽度对宽展的影响

(2) influence of strip width on the spread

随着轧件宽度的增加，变形区的金属在横向流动的阻力增加，导致宽展量减小。

With the increase of strip width, the increase in the deformation zone of metal transverse flow resistance, resulting in reduced amount of spread.

（3）轧辊工作表面对宽展的影响

(3) the influence of the roller working surface to spread

实践证明，使用表面粗糙的轧辊轧制，比使用表面光滑的轧辊轧制，轧件的宽展量大，这是由于前者比后者表面摩擦系数大的缘故。

Practice has proved that the use of the roll surface roughness, than the use of roller rolling smooth surface, large amount of spread of the workpiece, which is due to the former than the latter because of the surface friction coefficient.

所有使摩擦系数增大的因素，都促使宽展量加大。例如孔型磨老（变粗糙），轧件的宽展量就会增大。因为钢轧辊不如铸铁轧辊耐磨，所以，在轧制一段时间之后，用钢轧辊轧制的轧件比用铸铁轧辊轧制的轧件宽展量大。

All the friction coefficient increased factors have prompted the increase amount of spread. For example, the old mill pass (rough), will increase the amount of spread rolling. Because the steel roll as cast iron roll wear, so, after a period of time by rolling, rolling steel roller rolling iron roller than the workpiece width large amount.

（4）轧制速度与温度对宽展的影响

(4) effect of rolling speed and temperature on the spread of

当轧制速度超过2m/s时，轧制速度愈高，摩擦系数愈低。热轧时温度愈高，摩擦系数愈低。凡是使摩擦系数降低的因素都是减小轧件宽展的因素。

When the rolling speed is more than 2m/s, the rolling speed is higher and the friction coefficient is lower. The higher the temperature is, the lower the friction coefficient is. All the factors are friction coefficient decrease factors reduced the spread of rolled piece.