Multi-high mill cold rolling Technology Overview (1)

Multi-high mill cold rolling Technology Overview (1)

The rolling of cold rolled steel strips was initially carried out on two - and four-high mills. With the development of science and technology and industry, thinner strips are needed, and the original four-high mill can no longer meet this requirement, because the diameter of the roll of the four-high mill is relatively large, and the elastic flattening value generated by the roll itself during rolling is often larger than the thickness of the strip to be rolled.

When the unit pressure is the same, the elastic flattening of the roll is proportional to the diameter of the roll. When the material of the roll is fixed, the elastic flattening value of the roll must be reduced. As the roll diameter decreases, the roll stiffness is not enough. In order to solve this contradiction, a new type of structural rolling mill with small roll diameter and good stiffness, the multi-roll mill, has been developed.

The first multi-roll mill was a six-roll mill, and then it was developed into a 12-roll mill and a 20-roll mill. Figure 1-1 shows the roll system configuration diagram of the six-high mill, 12-high mill and 20-high mill. In order to obtain polar kelp with a thickness of less than 0.001mm, a twenty-six roll mill with a work roll diameter of 2mm, a thirty-two roll mill with a work roll diameter of 1.5mm and a thirty-six roll mill with a work roll diameter also appeared. The roll system configuration is shown in Figure 1-2. In the development process of the multi-roll mill, there have also been some compound multi-roll mills, whose roll system configuration is shown in Figure 1-3, in addition, there are multi-roll mills such as MKW(partial eight-high) mill, "z" (18-high) mill, CR(12-high) mill and other forms of multi-roll mills, whose roll system configuration is shown in Figure 1-4, among many types of multi-roll mills, the two-plus roll mill has developed the most Goodness is the most widely used. The twenty high mill also comes in many forms. The roll system of the.MKW mill and the "Z mill" can be converted into a four-high roll system, or the four-high mill can be transformed into a MEW mill and a "Z" mill.

Figure 1-1 Roller system configuration of six-high, twelve-high, 20-high rolling mill Figure A-six-high rolling mill; B-12 high mill; C-twenty high mill

Figure 1-2 Roll system configuration of twenty-six, thirty-two and thirty-six rolling mills Figure A-twenty-six rolling mills; B-thirty-two high mill; C-thirty-six high mill

Figure 1-3 Roller system configuration of compound multi-roll mill Figure 8-roll mill; B-12 high mill; C-nine high mill

Figure 1-4 Roll system configuration of partial eight high, "Z ", CR rolling mill a-MKW rolling mill (partial eight high mill); B-double partial eight-high mill (16-high mill); c- "2" mill (18-high mill); d-CR mill (12-high mill) Figure 1-5 Roll system configuration diagram of 30-high mill

Figure 1-5 Roll system configuration of a 30-high mill

In the early 1980s, the thirty high rolling mill was successfully developed in China. Figure 1-5 shows the roll system configuration of the mill. Rolling mill work roll diameter 2mm, backing bearing diameter 26mm, rolling metal and alloy, rolling product maximum width 45mm, minimum thickness 0.001mm. Extremely thin titanium strips of 0.0008mm ×40mm have been rolled out.