Reversing mill

Introduction

Reversing mills are key equipment used primarily for cold rolled strips. It has high precision and control requirements for mechanical, hydraulic and electronic control.

The 20-hi rolling mill adopts a split roller seat. The upper and lower roller seats are placed between the arches to place hydraulic cylinders, which are directly pressed by the servo automatic thickness control system. The rolls are arranged in the form of 1-2-3-4 of the upper and lower structures. The indicators have reached international standards.

In recent years, there are more and newer cold rolled stainless steel plate production lines in China. However, due to the large deformation resistance of stainless steel, alloy steel and the like, most of them are rolled by a reversible multi-roll mill. Usually consists of upper and lower systems, measuring systems, main rolling mill systems, rolling oil filtration systems, oil mist collection systems, main and auxiliary hydraulics, fire protection systems and so on.

Reversing Mill Types

Regardless of the types of reversing mills, the front and rear equipment and auxiliary systems are roughly the same, all of which are configured for the rolling mill production process. The main rolling mill generally has two categories of 20-hi rolling mill and 12-hi rolling mill.

The 20-Hi Sendzimir Mill is currently the most widely used model, and the 20-hi mill also has integral mills and split mills.

4-Hi Reversing Mill

The 4-hi reversing mill is the most widely used plate mill in modern times. It combines the advantages of a 2-Hi reversing mill and a 3-hi mill. The support roller and the work roll are completely divided, which reduces the rolling force and greatly increases the rigidity of the mill. Therefore, it is suitable for rolling medium and heavy plates of various sizes, especially medium and heavy plates with large rolling width, precision, and strict shape requirements. However, the cost of such a rolling mill is high, so it is often used as a finishing mill to save investment.

12-Hi Rolling Mill

The 12-hi rolling mill/12-hi reversing mill is used to roll very thin strip mills. It consists of two closed arches and upper and lower beams. The rollers are arranged symmetrically up and down according to the distribution of 3-2, and the three sets of support rollers are mounted on the support roller frame. Each set of support rollers is assembled from 6 to 7 large back pressure bearings and mandrels, which can be integrally loaded and pulled out of the frame.

Integral 20-Hi Rolling Mill

In the integral 20-hi reversing mill frame, each roller is mounted in the frame in a vertical and vertical symmetry according to the distribution of 4—3—2—1. Support roller assembly (8 sets in total). Each set of bearing rollers consists of six special bearings that are threaded from the mandrel and are fixed in the frame by the tow.

20-Hi Split Rolling Mill

Each roller is mounted in the frame and is vertically symmetrical according to the distribution of 4—3—2—1. The support roller assembly has a total of 8 sets. Each set of support rolls consists of six special bearings that are placed on the mandrel and are fixed in the frame by the tow. The action of the four large cylinders directly moves the upper half of the rolling mill and the upper roller to complete the pressing function. The upper intermediate roll and the in-rack guide are similar to the one-piece 20-roll mill.

Rolling Conditions

1. Rolled material: ferrous metals, nonferrous metals, comprising a metal matrix composite material.

2. Billet Specifications: Thickness H≤50mm, width B = 300mm or less;

3. Finished Product specifications: thickness H≥0.5mm, width B = 300mm or less;

4. The maximum rolling force: P≤120 tons;

5. Rolling speed: V1-20 m / min adjustable;

6. Rolling temperature: 500-1200 ℃ or less.

Parameter

Main Technical Parameters of the 20-hi Reversible Rolling Mill

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