Rolling mill

Classification of rolling mill:
1. Two high mill
Two high mill has two types: reversible and irreversible.
(1)。: High irreversible mill
The two high irreversible rolling mill has the advantages of simple structure, less auxiliary equipment, less manufacturing cost and easy installation
There are many mining factories in Sichuan. The most suitable flywheel device to save energy, which greatly improves the power efficiency. In addition,
Compared with the two high reversible type, this kind of rolling mill has lower rolling speed, lower degree of automation and smaller rolling mill size
Generally, only small ingots can be rolled, so the productivity of the rolling mill is also low.
It can roll ingots and plates. When it is used for hot rolling, in order to reduce physical labor, it is often equipped with a lifting table to lift
The descending table returns the rolled piece from the discharge end to the feed end through the upper roll.
(2) Two high reversible mill
This kind of rolling mill completely makes up for the shortcomings of two high irreversible rolling mill, reduces the intermittent time, and can obtain high production efficiency
Productivity, meeting the requirements of modern production. However, the structure of this rolling mill is complex, there are many auxiliary equipment and electricity
Gas equipment is also relatively complex, so the cost is expensive.
The two high reversible mill uses DC motor, which not only improves the productivity, but also can adjust the speed
It is helpful to control the biting speed, normal rolling speed and throwing speed, and to improve the rolling process.
2. three high mill
There are two types of three high mills used to roll slabs: – one is the equal diameter of three rolls, which is called equal diameter type;
The other is that the diameter of the middle roll is much smaller than that of the upper and lower rolls, – generally 2 / 3 of the diameter of the middle roll. This kind of rolling mill is called Laut
Rolling mill.
On the Lauter mill, the lower roll is installed in the fixed bearing, and the upper roll can be close to the lower roll by pressing the lower machine; Medium rolling
The roll rotates by the friction generated during rolling. It sometimes presses against Upper roll, sometimes press down roll. This kind of rolling mill
The advantage is that the metal extends well.
Although the three roll type has higher productivity than the two roll type irreversible type, its stiffness is still small: the wear ratio of the middle roll