CN103212579B - A kind of six-high cluster mill - Google Patents

Abstract

The invention provides a six-high rolling mill, comprising: an upper back-up roll, an upper middle roll, an upper work roll, a lower work roll, a lower middle roll, a lower back-up roll and a hydraulic lateral thrust device, the upper back-up roll, upper middle roll , the upper work roll, the lower work roll, the lower intermediate roll and the lower back-up roll are arranged in order from top to bottom and are respectively supported on their respective bearing housings by rotating bearings. The upper back-up roll and the lower back-up roll are relatively The rolling line of the rolling mill is symmetrically arranged, the upper intermediate roll and the lower intermediate roll are symmetrically arranged relative to the rolling line, the upper working roll and the lower working roll are symmetrically arranged relative to the rolling line, and the upper and lower intermediate rolls are symmetrically arranged relative to the rolling line. The centerlines of rotation of the lower intermediate roll and the upper and lower work rolls are separated by no more than 1 mm in the horizontal direction, and the hydraulic side pushing device supports the bearing housings from the sides of the bearing housings of the upper and lower working rolls. The six-high rolling mill provided by the invention can adopt small working roll diameters when rolling high-resistance materials, has high product output and quality, simple structure, and obviously reduces production costs.

Description

A six-high rolling mill

technical field

The invention relates to a six-high rolling mill, in particular to a six-high rolling mill for cold strip rolling of high resistance materials.

Background technique

The six-high rolling mill is a mainstream type of strip rolling with mature technology. It has the advantages of high output, high quality of finished products, low consumption, low difficulty in equipment manufacturing and low maintenance. Its main structure is shown in Figure 1, including rolling line adjustment device 101, upper backup roll 102, upper intermediate roll 103, intermediate roll bending roll shifting device 104, upper working roll 105, working roll bending hydraulic cylinder 106, working Roll bending block 107, lower working roll 108, lower intermediate roll 109, frame 110, lower backup roll 111 and roll gap adjustment hydraulic cylinder 112. The rolling line adjustment device 101 is used for adjusting the height of the rolling line. The intermediate roll bending and roll shifting device 104 is used to adjust the shape of the plate. Work roll bending hydraulic cylinder 106 is used to adjust the shape of the plate. The roll gap adjustment hydraulic cylinder 112 is used to adjust the exit thickness of the rolled piece. However, the work rolls of conventional six-high cold rolling mills cannot be made too small, and the ratio of the diameter (roll body diameter) to width (strip width) of the work rolls is generally not less than 0.25. When rolling high-resistant materials such as medium-high grade silicon steel, Stainless steel, high-strength steel and strip steel with extremely thin specifications are difficult to handle. At this time, multi-roll mills are often used for rolling. Typical models are 20-roll mills and 18-roll mills. Compared with the six-high rolling mill, the multi-roll rolling mill has the disadvantages of low rolling speed, low output, large consumption, troublesome operation, complex equipment, difficult manufacturing and large maintenance. If the six-high rolling mill can be used for rolling, there will be obvious economic benefits. benefit.

To roll the above materials with a six-high mill, the diameter of the work rolls needs to be greatly reduced. The upper work roll 105, the lower work roll 108, the upper back-up roll 102 and the lower back-up roll 111 of a conventional six-high rolling mill are located at the center of the frame window, and the rotation centerlines of the above four rolls coincide in the horizontal direction, and the upper middle roll 103 and the lower middle roll The centerlines of rotation of the rolls 109 overlap in the horizontal direction, and are designed with an offset with respect to the centerlines of rotation of the upper work roll 105, the lower work roll 108, the upper backup roll 102 and the lower backup roll 111, usually the offset is 5 to 6mm. Under the action of eccentricity, the rolling force will generate a horizontal component force on the roll, so as to eliminate the gap between the roll bearing seat and the frame, and ensure the stable position of the roll system during rolling. The eccentric force is very large, and it is the main component of the horizontal force of the work rolls for the six-high rolling mill driven by the work rolls. Under the action of the horizontal force of the work roll body, the reduction of the roll diameter leads to the increase of its horizontal deflection, which further deteriorates the shape of the finished plate.

An existing solution is to use HS rolling mill, that is, the middle roll is driven and the work roll is made to be horizontally movable, and the offset distance between the work roll and the middle roll is adjusted during rolling to greatly reduce the work roll level. The force thus greatly reduces its roll diameter. Due to the fluctuation of rolling parameters, it is necessary to adjust the offset distance in time to maintain the small horizontal force state of the work rolls at any time. This method maintains the main advantages of the six-high rolling mill, but the structure and control are more complicated, and since the rolling torque is provided by the friction between the middle roll and the work roll, the roughness of the work roll body must not be too small, thereby reducing the The surface quality of the finished strip also has obvious disadvantages.

Contents of the invention

The technical problem to be solved by the present invention is to provide a six-high rolling mill that can use small working roll diameters when rolling high-resistance materials.

The invention provides a six-high rolling mill driven by work rolls, comprising: an upper back-up roll, an upper middle roll, an upper work roll, a lower work roll, a lower middle roll, a lower back-up roll, and a hydraulic lateral thrust device. Rolls, upper intermediate rolls, upper work rolls, lower work rolls, lower intermediate rolls and lower back-up rolls are arranged in sequence from top to bottom and are supported on their respective bearing housings by rotating bearings, and the upper back-up rolls and lower back-up rolls are opposite to each other The rolling line of the six-roll mill is symmetrically arranged, the upper intermediate roll and the lower intermediate roll are symmetrically arranged relative to the rolling line, and the upper working roll and the lower working roll are symmetrically arranged relative to the rolling line , the centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are separated by no more than 1 millimeter in the horizontal direction, and the hydraulic lateral thrust device supports the The above-mentioned bearing housing.

The centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are separated by no more than 0.3 millimeters in the horizontal direction.

The centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are separated by no more than 0.2 mm in the horizontal direction.

The centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are aligned in the horizontal direction.

The rotation centerlines of the upper and lower supporting rollers and the rotation centerlines of the upper and lower intermediate rollers are arranged at intervals in the horizontal direction.

The hydraulic side pushing device includes a movable liner, a side thrust hydraulic cylinder and a first work roll bending block, the movable liner is pushed by a side thrust hydraulic cylinder embedded in the work roll bending block, the movable The liner is connected with the chock of the work roll, so that the movable liner clamps the chock of the work roll during rolling.

The other side of the chock of the work roll is provided with a fixed liner, and the fixed liner is fixed on the bend block of the second work roll opposite to the bend block of the first work roll

The beneficial effects of the present invention are mainly:

1. The non-offset design can produce mechanical effects. Compared with the conventional six-high rolling mill, the horizontal force of the work rolls is reduced by more than 2/3, thus greatly reducing the horizontal deflection of the work rolls when using small work rolls.

2. The non-offset design can also produce geometric effects. Compared with the conventional six-high rolling mill with the same deflection of the work rolls, the adverse effect on the strip shape is reduced by about 4/5, thereby increasing the allowable horizontal deflection of the work rolls, so that Work rolls can be made smaller.

3. The lateral thrust hydraulic cylinder presses the work roll chock horizontally to ensure the stable position of the work roll during rolling.

4. The large offset distance between the intermediate roll and the back-up roll can ensure the stability of the intermediate roll during rolling.

Description of drawings

Fig. 1 is a schematic diagram of a six-high rolling mill in the prior art.

Fig. 2 is a schematic diagram of a six-high rolling mill in the present invention.

Fig. 3 is a partial schematic diagram in the direction of P of the six-high rolling mill in the present invention.

Fig. 4 is a partial schematic diagram of the B-B direction of the six-high rolling mill in the present invention.

detailed description

In order to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with implementation examples and accompanying drawings. As shown in Figure 2-4, the six-high rolling mill includes a rolling line adjustment device 201, an upper backup roll 202, an upper intermediate roll 203, an intermediate roll bending roll shifting device 204, an upper working roll 205, and a working roll bending hydraulic cylinder 206 , Work roll bending block 207, lower work roll 208, lower intermediate roll 209, frame 210, lower back-up roll 211, roll gap adjustment hydraulic cylinder 212 and hydraulic side pusher. As in the prior art, the pass line adjustment device 201 is used to adjust the height of the pass line. The intermediate roll bending and roll shifting device 204 is used to adjust the shape of the plate. Work roll bending hydraulic cylinder 206 is used to adjust the shape of the plate. The roll gap adjustment hydraulic cylinder 212 is used to adjust the exit thickness of the rolled piece.

Wherein, the upper support roll 202, the upper intermediate roll 203, the upper work roll 205, the lower work roll 208, the lower intermediate roll 209 and the lower support roll 211 are arranged in sequence from top to bottom and are respectively supported on respective bearing housings by rotating bearings, The upper back-up roll 202 and the lower back-up roll 211 are arranged symmetrically with respect to the rolling line of the six-roll mill, the upper intermediate roll 203 and the lower intermediate roll 209 are arranged symmetrically with respect to the rolling line, and the upper work roll 205 and the lower work roll 208 are arranged symmetrically with respect to the rolling line of the six-roll mill. The rolling lines are arranged symmetrically. The centerlines of rotation of the upper work roll 205, the lower work roll 208, the upper middle roll 203 and the lower middle roll 209 of the six-high rolling mill coincide in the horizontal direction, that is, it is designed as a non-offset structure, and the upper back-up roll 202 and the lower back-up roll 211 are located at At the center of the frame window, the rotation centerlines of the upper support roller 202 and the lower support roller 211 coincide in the horizontal direction. The upper intermediate roller 203, the lower intermediate roller 209 and the rotation centerlines of the upper supporting roller 202 and the lower supporting roller 211 are provided with a certain offset distance in the horizontal direction. At the same time, in order to counteract the force in the horizontal direction, the hydraulic side pushing device supports and clamps the bearing housings from the sides of the bearing housings of the upper work roll and the lower work roll.

The hydraulic side thrust device includes a movable liner 216, a side thrust hydraulic cylinder 214 and a first work roll bending block 207-1, and the movable liner 216 is formed by a side thrust hydraulic cylinder embedded in the work roll bending block 207. 214 pushes, and the movable liner 216 is connected with the chock of the work roll, so that the chock of the work roll is clamped by the movable liner 216 during rolling. Clamping the chocks of the work rolls during rolling can ensure the stability of the position of the work rolls during rolling, and loosen the chocks of the work rolls to pull out the rolls in the axial direction when changing the rolls.

The other side of the chock of the work roll is provided with a fixed liner 219, and the fixed liner 219 is fixed on the second work roll bend block 207-2 opposite to the first work roll bend block 207-1.

The first work roll bending block 207-1 on the side of the movable liner 216 is embedded and fixed with an I-shaped work roll bending cylinder block 213, and the work roll bending cylinder block 213 is equipped with a work roll bending hydraulic cylinder 206, and is equipped with The bushing 215 guides the piston rod of the side thrust hydraulic cylinder 214 . The snap key 217 divided into two halves fixes the movable lining plate 216 on the piston rod of the side thrust hydraulic cylinder 214, and the snap key gland 218 limits the position of the snap key 217.

In the above embodiment, the centerlines of rotation of the upper work roll 205, the lower work roll 208, the upper middle roll 203 and the lower middle roll 209 of the six-high rolling mill are aligned and overlapped in the horizontal direction. The effect, and the mechanical effect of the non-offset design is almost optimal, and the smallest work roll diameter (roll body diameter) width (strip width) ratio can be obtained. However, when there is a small offset between the centerlines of rotation of the upper work roll 205 and the lower work roll 208 and the center line of rotation of the upper intermediate roll 203 and the lower intermediate roll 209, such as within 0.2 mm or within 0.3 mm, no offset design Mechanical effects may be optimal. As an optional embodiment, when the rotation centerlines of the upper work roll 205 and the lower work roll 208 and the rotation centerlines of the upper intermediate roll 203 and the lower intermediate roll 209 are not more than 1 mm, better mechanical effects and geometrical effects can be obtained. The effect results in a smaller work roll diameter-to-width ratio.

In the present invention, the centerlines of rotation of the upper work roll 205 and the lower work roll 208 and the centerlines of rotation of the upper intermediate roll 203 and the lower intermediate roll 209 are aligned in the horizontal direction or set as a small deviation in a favorable direction. A larger offset distance is designed between the above backup rolls, and a hydraulic side thrust device is installed on the side of the corresponding bearing housing, and the bearing housing of the work roll is clamped during rolling to ensure that the position of the work roll is stable during rolling, and it is loose when changing the roll. Open the work roll chock to withdraw the roll axially. The rolling mill designed according to this method can produce medium and high-grade silicon steel, high-strength steel, titanium alloy, nickel-based alloy and some stainless steel at a relatively low cost, inheriting all the advantages of the conventional six-high rolling mill and avoiding the disadvantages of the HS rolling mill.

The above descriptions are only application examples of the present invention, and of course the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the patent scope of the present invention still belong to the protection scope of the present invention.

Claims (5)

1. A six-high rolling mill, comprising: an upper back-up roll, an upper middle roll, an upper work roll, a lower work roll, a lower middle roll, a lower back-up roll, and a hydraulic lateral pusher, the upper back-up roll, the upper middle roll, the upper The work roll, the lower work roll, the lower intermediate roll and the lower back-up roll are arranged sequentially from top to bottom and are respectively supported on their respective chocks by rotating bearings. The upper back-up roll and the lower back-up roll are relatively The rolling line is symmetrically arranged, the upper intermediate roll and the lower intermediate roll are symmetrically arranged relative to the rolling line, the upper working roll and the lower working roll are symmetrically arranged relative to the rolling line, and it is characterized in that: the The centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are separated by no more than 1 mm in the horizontal direction, and the hydraulic lateral thrust device supports the bearing housings from the side of the bearing housings of the upper and lower working rolls ; The rotation centerlines of the upper and lower support rollers and the rotation centerlines of the upper and lower intermediate rollers are arranged at intervals in the horizontal direction; The hydraulic side pushing device includes a movable liner, a side thrust hydraulic cylinder and a first work roll bending block, the movable liner is pushed by a side thrust hydraulic cylinder embedded in the work roll bending block, the movable The liner is connected with the chock of the work roll, so that the movable liner clamps the chock of the work roll during rolling. 2. The six-high rolling mill according to claim 1, characterized in that the distance between the centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls in the horizontal direction is no more than 0.3 mm. 3. The six-high rolling mill according to claim 1, characterized in that the distance between the centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls in the horizontal direction is no more than 0.2 mm. 4. The six-high rolling mill according to claim 1, characterized in that, the centerlines of rotation of the upper and lower intermediate rolls and the upper and lower work rolls are aligned in the horizontal direction. 5. The six-high rolling mill according to claim 1, characterized in that, a fixed liner is provided on the other side of the chock of the work roll, and the fixed liner is fixed on the first work roll opposite to the bending block of the first work roll. The second work roll is on the bending block.