Types of Rolling Mills

The different types of rolling mills are shown in Figure 21.2. In two high rolls mill (pullover), the stock is returned to the entrance for further reduction. In two-high mill (reversing), the work can be passed back and forth through the rolls by reversing their direction of rotation. In three high rolls mill, upper and lower rolls are driver and the middle roll rotates by friction. In four high rolls mill, small diameter rolls of less strength and rigidity are supported by larger diameter backup rolls. In cluster mill, each of the work rolls is supported by two backing rolls. Continuous rolling uses a series of rolling mill and each set is called a stand. The strip moves at different velocities at each stage in the mill.

Figure 21.2 Types of Rolling Mills