Continuous Rolling Mill

Continuous Rolling Mill

The main working principle of continuous rolling mill is that when the billet is heated and discharged from the furnace, the oxidized iron sheet is removed by high-pressure water, and then the billet is processed in a four-roll reversible roughing mill. Finally, the intermediate billet which we need and suitable for continuous rolling mill is rolled. In the process of billet opening, the vertical roll can effectively ensure the precise width of the steel plate and the intermediate billet. After shearing, it will directly enter the continuous rolling mill to wait for processing and can be rolled to the specifications required by customers at one time. After rolling, the coiler will take up the coil. In the process of rolling, the roughing and finishing mill needs high-pressure water for secondary dephosphorization.

Introduction of Four-roll Continuous Rolling Mill:

Main Uses: This kind of mill is a one-way and irreversible four-high cold rolling mill. It is mainly used for rolling stainless steel, aluminum, carbon steel, copper and zinc, and other metals.

Main Features and Structures: The main components of this rolling mill are reducer, motor, universal joint shaft, human gearbox, stand, pressing part, electronic control cabinet, and roll system. The roll system uses special bearings for continuous rolling mill. The material of roll is 9Cr2Mo. If it is a large mill bearing base, it will also have a roll changing device.

What are the Different Types of Rolling Mills?

What are the Different Types of Rolling Mills?

The rolling mill is mainly a kind of equipment for rolling metals. It can not only arrange according to the parts rolls but also differentiate according to the main arrangement of the stand. The main product classifications are as follows:

1. First, two-roll mill, the biggest feature of this mill is very simple in structure and has a wide range of uses. It can be divided into reversible or irreversible type. Reversible type mainly includes blooming mill, plate mill, and rail beam mill. The irreversible rolling mill can be divided into laminated thin plate rolling mill, strip rolling mill, continuous slab rolling mill and thin plate rolling mill. If classified according to this form, there are four-roll mill, six-roll mill, three-roll mill, and five-roll mill.

2. Planetary rolling mill mainly uses two large-diameter supporting rolls to drive two sets of planetary roll systems. Whether flat ingots or slabs, they can be directly rolled into thin strips at one time. If continuous caster can be directly used in the front process and temper mill is used in the back process, the production process of hot strip steel can be effectively simplified. 

3. Universal rolling mill is mainly composed of vertical roll and flat roll, and all its accessories are basically driven by power, so it can be used in slab or flat steel rolling for many times.

Selection of Raw Material in Steel Rolling Mill Production

Selection of Raw Material in Steel Rolling Mill Production

In steel rolling mill production, ingots, billets and continuous casting billets are commonly used as raw materials, and die casting billets are also used.

  

Material selection should pay attention to:

(1) Production and quality should be considered.

Choose appropriate billet size, reduce rolling passes as much as possible to increase production, while ensuring compression ratio.

(2) Considering the economic benefits and production possibilities, all consumption should be reduced.

Raw material preparation is mainly to check and clean up various surface defects (scarring, cracking, slag inclusion, folding, etc.) If not cleaned before rolling, rolling will continue to expand and cause more defects.

Cleaning methods:

Flame Cleaning: As for carbon steel, low alloy steel, metal consumption is large

Wind shovel cleaning: suitable for carbon steel, alloy steel, high carbon steel (alloy steel has poor thermal conductivity, easy to crack by direct flame cleaning, must be preheated)

Grinding Wheel Cleaning (Planing): Suitable for alloy steel, peeling, the high metal consumption