WO1999011396A1

WO1999011396A1 - A mill for rolling strips or plates

Info

Publication number: WO1999011396A1
Application number: PCT/CN1997/000092
Authority: WO
Inventors: Hongzhuan Zheng; Linzhen Zhao
Original assignee: Hongzhuan Zheng; Linzhen Zhao
Priority date: 1997-09-04
Filing date: 1997-09-04
Publication date: 1999-03-11
Also published as: CA2302424C; EP1020237A4; CA2302424A1; EP1020237A1; AU750839B2; DE69731671T2; RU2198750C2; KR20010023650A; DE69731671D1; EP1020237B1; DE29780450U1; AU4110397A; ATE282485T1; KR100504356B1

Abstract

A mill for rolling strips or plates, comprising: frames of the rolling stand, upper and lower crossbeams, screw-down means, upper and lower roll groups and roll chocks. The upper/lower crossbeam is respectively mounted on the upper/lower side of the frames, to which the screw-down means are fixed, and the screw-down means are located at the end portions of the upper crossbeam to enable the latter to move for adjusting roll gap. The roll chocks and the upper and lower roll groups are arranged between the upper and lower crossbeams. Supporting blocks are placed between the roll chocks and the crossbeams, and the bearings are provided between the upper/lower roll groups and the roll chocks. Both the bearings and the supporting blocks are positioned at the middle part of the rolls and in the area of the roll bodies.

Description

Rolling mill for rolled sheet and strip

The present invention relates to a rolling mill for producing plate and strip, and in particular, to a ceremonial machine that supports the roll in the middle and controls the deflection of the roll, so that the rolled plate and strip have the characteristics of high lateral thickness accuracy. Background technique

There are many types of rolling mills for rolling plate and strip. At present, two-high, four-high rolling mills and HC rolling mills are commonly used. The main disadvantage of these rolling mills is that when the rolling stock passes the stand, the roll neck bears a huge rolling force, so the roll has a large flexural deformation. The deformation of the roll will inevitably cause the rolling stock (rolling Strip thickness), which seriously affects the quality of rolled products. In order to solve the above problems, a method of increasing the diameter of the roll has to be adopted; for a four-high rolling mill and the HC mill, a method of increasing the diameter of the support rod has to be adopted. However, with the increase of the roll diameter, a large lateral thickness deviation of the rolling stock due to the rolling force is inevitable. Object of the invention

Therefore, the present invention aims to solve the problem of roll deflection in the prior art described above, and its purpose is to propose a high-precision rolling mill for rolling plate and strip. The deflection of the roll is greatly reduced, thereby rolling. The dimensional accuracy of the piece is greatly improved. Technical solutions

The object of the present invention is achieved by providing a rolling mill for rolling plate and strip, including: a stand, upper and lower beams, a reduction device, a roll holder, an upper roll system and a lower roll system, wherein the upper and lower Transverse beams are installed at the upper and lower ends of the frame, respectively, and the reduction device is installed on the frame and is located at both ends of the beam and can move at least one of the upper and lower beams to adjust the roll gap, An upper and lower roll system and at least one roll base are provided between the upper and lower beams, a support pad is provided between the roll base and the cross beam, a bearing is provided between the roll system and the roll base, and, The support pad and the bearing are located in the middle of the roller system and within the range of the roller length.

Preferably, an arc-shaped sliding bearing is provided between the roll base and the roll system. According to another aspect of the present invention, a rolling mill for rolling plate and strip is provided, including: a stand, upper and lower beams, a reduction device, a roll, an upper roll system and a lower roll system, wherein the above And lower beams are fixedly installed at the upper and lower ends of the frame, respectively. At least one roll base and upper and lower roll systems are arranged between the upper and lower beams, and at least one of the upper and lower beams is provided in the middle portion. There is the reduction device, which can move the roll holder in contact with it to adjust the roll gap, and a bearing is provided between the roll holder and the upper and lower roll systems, and the bearing is located at the middle of the roll system , And within the range of roll length. In the present invention, since the support at the roll necks at both ends of the roll in the prior art is changed to the middle support of the roll, that is, through a bearing, a support pad or a pressing device arranged in the middle area of the work roll roll axis. The central support device makes the rolling mill greatly reduce the flexural deformation caused by the rolling force. Therefore, the cross-section thickness error of the rolled product is reduced, and the dimensional accuracy is greatly improved. Brief description of the drawings

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which:

1 is a schematic front view of a rolling mill according to a first embodiment of the present invention;

2 is a schematic side view of a rolling mill according to a first embodiment of the present invention;

3 is a schematic front view of a rolling mill according to a second embodiment of the present invention;

4 is a schematic side view of a rolling mill according to a second embodiment of the present invention;

5 is a schematic front view of a rolling mill according to a third embodiment of the present invention;

6 is a schematic side view of a rolling mill according to a third embodiment of the present invention;

7 is a schematic front view of a rolling mill according to a fourth embodiment of the present invention;

8 is a schematic side view of a rolling mill according to a fourth embodiment of the present invention;

9 is a schematic front view of a four-high rolling mill in the prior art;

10 is a schematic side view of a four-high rolling mill in the prior art; the best way to implement the present invention

The present invention will be described in detail below. In the above-mentioned schematic diagram, the positioning methods of the work rolls of all rolling mills are not shown, and in each drawing, the same or similar components are denoted by the same reference numerals.

Fig. 9 and Fig. 10 are schematic diagrams of a commonly used four-high rolling mill. Both ends of the rolls (work rolls or support rolls) of this type of rolling mill are supported on the stand of the rolling mill, that is, they undergo huge rolling at the roll diameter. Stress. During the rolling process, due to the rolling pressure, the rolls will inevitably be deformed, which will cause the thickness of the rolled plate to be uneven in the width direction, and the thickness accuracy of the plate will not meet the requirements, which will greatly affect the rolling. The quality of the pieces.

Figures 1 and 2 show a centrally supported rolling mill according to a first embodiment of the present invention. The rolling mill has a frame 4 which consists of two pieces of left and right. Upper and lower beams 8 and 8 'are respectively installed near the upper and lower ends of the frame 4, and work rolls 12, 12', and bearings 14, 14 'are installed in the window of the frame between the upper and lower beams. Roller seats 16, 16 'and middle support pads 18, 18'. Located between the two work rolls 12, 12 ′ is the rolling stock 2. It can be seen from the figure that the roll body of the upper work roll 12 is supported on the upper roll base 16 by an upper bearing 14, which is an arc-shaped or semi-circular sliding bearing. A support pad 18 is installed between the upper roll base 16 and the upper cross beam 8. Both the support pad and the sliding bearing should be located in the middle area along the axis of the work roll body, that is, it should not be located at the journal portions at both ends of the work roll, and within the length of the work roll body. The support pad may be one or more pieces. In the illustrated embodiment, the support pad is two pieces arranged symmetrically. A pressing device 6 is provided on the frame 4 at both ends of the upper beam 8. The pressing device 6 is in contact with both ends of the upper cross beam 8 to bear the rolling force, and the up and down movement of the pressing device 6 can move the upper cross beam 8 up and down in the window of the frame 4 in order to adjust the roll gap. In the illustrated embodiment, the pressing device 6 is a screw device, but obviously it can also be replaced by a hydraulic cylinder.

The roll body of the lower work roll 12 'is supported on the lower roll base 16' by a lower bearing 14 ', which is also an arc or semicircular sliding bearing. A support pad 18 'is installed between the lower roll base 16' and the lower cross beam 8 '. The support pads and sliding bearings should be located in the middle area along the axis of the work roll body and within the length of the work roll body. Both ends of the lower beam 8 ′ are supported by the frame 4. Obviously, the adjustment of the rolling line can be achieved by selecting the middle support pads 18 'of different thickness specifications. A hydraulic device or a screw device may also be used in place of the central support pad 18 'to achieve adjustment of the rolling line. The adjustment of the rolling line can also be achieved by providing a spacer or a hydraulic device or a screw device between the lower cross beam 8 'and the frame 4.

Due to the structure of the rolling mill of the present invention, the deflection of the roll is significantly reduced. This is because the rolling mill of the present invention structurally forms a support system located near the middle of the axis of the work roll body and within the length of the roll body, so it ensures that The correct shape of the work roll busbar, that is, the straightness of the busbar, so that the bending deformation of the work roll basically does not change with the change of the rolling force, so that its bending deformation is greatly reduced, and the final effect makes the rolling

The thickness error of the sheet metal strip is reduced. In this embodiment, the rolling mill can be turned upside down, and the same effect can be obtained even if the pressing device is turned upward.

The rolling mill according to the second embodiment of the present invention shown in Figs. 3 and 4 is an example in which the present invention is applied to a four-high rolling mill. The rolling mill has a stand 4, a pressing device 6 and upper and lower cross beams 8 and 8 ′. Work rolls 22 and 22 ′, support rolls 23 and 23 ′ and bearings 24 are installed in the window of the stand between the upper and lower cross beams. 24 ', roll holders 26, 26' and middle support pads 28, 28 '. This embodiment differs from the first embodiment only in that a backup roller is provided between the work stick and the roll base, and other structures and principles are the same as those of the first embodiment. If an intermediate suction roll is added between the work roll and the support roll, that is, an example in which the present invention is applied to an HC rolling mill, the effect will be better.

Figs. 5 and 6 show a third embodiment of the present invention. As can be seen from the figure, this is an example of applying the present invention to a tower roll mill. The rolling mill has a stand 4, a pressing device 6, and lower and lower cross beams 8, 8 '. Working bars 32, 32' are installed in the window of the stand between the upper and lower cross beams, and two support rollers are provided on the upper and lower sides. 33, 33 ', bearings 34, 34', roll stands 36, 36 'and middle support pads 38, 38'. This embodiment is not limited to the six-roll tower-type rolling mill shown in the figure, and is also applicable to tower-type rolling mills having other bars or structures.

In the second and third embodiments of the present invention, the bearing used may be the same plain bearing as the first embodiment, or the support roller itself may be made into a backing bearing without using such a plain bearing, that is, Rolling bearing consisting of inner ring and outer ring.

7 and 8 show a rolling mill according to a fourth embodiment of the present invention. The rolling mill has a frame 4, a pressing device 6, and upper and lower beams 8, 8 ', and the upper and lower work rolls 42, 42', and bearings 44, 44 are installed in the frame window between the upper and lower beams. ', Upper and lower roll stands 46, 46' and a middle support block 48 'located between the lower roll stand 46' and the lower cross beam 8 '. Compared with the first embodiment, this embodiment fixedly installs the upper beam 8 of the rolling mill and the frame 4, and moves the pressing device 6 from the frames 4 corresponding to the two ends of the upper beam to the upper beam. The middle region of the cross beam along the axis direction of the work roll body eliminates the upper support pad, so that the pressing device 6 directly contacts the upper roll holder 46. It can be seen that, in this embodiment, the pressing device of the first embodiment is pressed at both ends of the beam to be pressed at the middle, that is, it functions as a pressing device and an upper support pad at the same time. In this embodiment, the roller system and the rolling stick base in the second and third embodiments can also be applied to this embodiment, and the description will not be repeated here. In this embodiment, the upper and lower transverse beams 8, 8 'and the frame 4 can be spliced, welded or casted together, which also has the same effect.

The second, third, and fourth embodiments can all turn the rolling mill upside down, and have the same effect. The screws in the second, third, and fourth embodiments can also be replaced by hydraulic cylinders,

Regarding the transmission of the rolling force to the solutions of the second, third, and fourth embodiments, and the principle and effect of reducing the deflection of the work roll by the middle support or middle reduction are basically the same, and will not be described repeatedly here. .

Compared with the prior art, the rolling mill of the present invention has the following advantages: ''

Because the position of the middle support or reduction device of the rolling mill of the present invention is located in the middle region of the work roll roll axis, a middle support system is formed for the work roll within the range of the work roll roll length, thereby ensuring the shape of the work roll busbar and making the work The deflection of the roll is basically not changed with the fluctuation of the rolling force, so that the thickness error of the plate and strip is reduced.

The rolling mill of the present invention can greatly simplify the design of the original roll shape and the control of the roll shape during rolling. Because the bending deformation of the work roll of the invention does not substantially change with the fluctuation of the rolling force, Factors such as roll deflection, flattening deformation, thermal expansion, and abrasion can ignore the most important factor of deflection, while thermal expansion and abrasion are factors that change slowly. The control of the roll shape during rolling is greatly simplified. In addition, because the "hole shape" formed by the bending deformation of the two work rolls in the prior art is avoided, it is beneficial to the reasonable lateral flow of the metal, which is beneficial to the use of wedge-shaped blanks. Rolling high-precision plate and strip, and greatly reducing the "edge thinning" of the plate and strip. The upper and lower roll holder assemblies (including the roll holder and the roll system) in the first, second, third, and fourth embodiments of the present invention may be arranged in a crossover relationship with each other, or with the roll holder assembly or the roll system in the prior art. The cross configuration can also achieve the aforementioned object of the present invention.

The rolling mill of the present invention is also particularly suitable for retrofitting existing two-high rolling mills, four-high rolling mills, HC rolling mills, etc., and the original rolling mill roll system can be replaced.

The present invention is not limited to being applied to a cold rolling mill, but can also be applied to a rolling mill for producing hot-rolled steel strip. Although the preferred embodiments of the present invention have been described above, for those skilled in the art, modifications made to the present invention should be included in the scope of the present invention without departing from the scope of the appended claims of the present invention. within.

Claims

6 claims

1. A rolling mill for rolling plate and strip, comprising: a frame (4), upper and lower beams (8,8 '), a reduction device (6), a rolling rod seat (16,16'; 26,26 '; 36, 36'), the upper roller system (12; 22, 23; 32, 33) and the lower roller system (12 '; 22', 23 '; 32', 33 '), where the above, The lower beam is installed at the upper end and the lower end of the frame (4), and the pressing device (6) is installed on the frame (4) and is located at both ends of the beam to enable the upper and lower beams. At least one of them moves to adjust the roll gap, and the upper and lower roll systems and at least one roll base are provided between the upper and lower beams, and a support pad (18,18 '; 28, 28 '; 38, 38'), a bearing (14,14 '; 24,24'; 34,34 ') is provided between the roll system and the roll base, and the support pad and the The bearing is located in the middle of the roller system and is within the range of the roller length.

2. The rolling mill according to claim 1, wherein an upper and a lower roller system and two upper and lower roller seats are provided between the upper and lower beams.

3. The rolling mill according to claim 1 or 2, wherein the bearing is an arc-shaped sliding bearing.

4. The rolling mill according to claim 3, wherein the upper roll is constituted by a work roll (12), and the sliding bearing (14) is provided on the work roll (12) and the roll holder (16) between.

5. The rolling mill according to claim 3 or 4, wherein the lower roll is constituted by a work roll (12 '), and the sliding bearing (14') is disposed between the work roll (12 ') and Between the roller seats (16 ').

6. The rolling mill according to claim 3, wherein the upper roll is composed of a work roll (22) and a support roll ( ₂₃ ), and the sliding bearing (24) is provided on the support roll (23) ) And the roller seat (26),

7. The rolling mill according to claim 3 or 6, wherein the lower roll is composed of a work roll (22 ') and a support roll (23'), and the sliding bearing (24 ') is provided at Between the support roll (23 ') and the roll stand (26').

8. The rolling mill according to claim 3, wherein the upper roll is composed of a work roll (32) and at least two support rolls (33), and the sliding bearing (34) is provided on the Between the support roll (33) and the roll base (36).

9. The rolling mill according to claim 3 or 8, wherein the lower roll is composed of a work roll (32 ') and at least two support rolls (33'), and the sliding bearing (34 ') is provided The support roller

(33 ') and the rolling stick seat (36').

10. The rolling mill according to claim 1, wherein said upper roll is composed of a work roll (22, 32) and at least one back-up roll (23, 33), and said back-up roll includes inner and outer Rolling bearings consisting of rings.

11. The rolling mill according to claim 1 or 10, wherein the lower roll is composed of a work roll (22 ', 32') and at least one support roll (23 ', 33'), and the support The roller is a rolling bearing composed of an inner ring and an outer ring.

12. The rolling mill according to any one of claims 1 to 11, wherein one of the upper and lower beams is fixedly mounted on the frame (4), and the other of the upper and lower beams can be It is moved by the pressing device at both ends.

13. The rolling mill according to any one of claims 1 to 11, wherein the upper and lower beams can be moved by the pressing devices at both ends thereof.

14. The rolling mill according to any one of the preceding claims, wherein a bearing is provided between the upper roll system and the lower roll system and a roll holder.

15. A rolling mill for rolling plates and strips, comprising: a frame (4), upper and lower cross beams (8,8 '), a reduction device (6), a roll holder (4,4'), an upper roll system (42) and a lower roll system (42 '), wherein the upper and lower beams are fixedly installed at the upper and lower ends of the frame (2), respectively, and at least one roll base and The upper and lower roller systems, at least one of the upper and lower cross beams is provided with the reduction device (6) in the middle portion thereof, and the reduction device can move the roller base (46, 46 ') in contact therewith. To adjust the roll gap, a bearing (44, 44 ') is provided between the roll base and the upper and lower roll systems. The bearing is located in the middle of the stick system and is within the range of the roll length.

16. The rolling mill according to claim 15, wherein an upper and a lower roll system and two upper and lower roll stands are provided between the upper and lower beams.

17. The rolling mill according to claim 15 or 16, wherein the bearing is an arc-shaped sliding bearing (44, 44 ').

18. The rolling mill according to claim 17, wherein the upper roll is constituted by a work roll (42), and the sliding bearing (44) is provided on the work roll (42) and the roll holder (46) between.

19. The rolling mill according to claim 17 or 18, wherein the lower roll is composed of a work roll (42 '), and the sliding bearing (44') is disposed between the work roll (42 ') and Between the roller seats (46 ').

20. The rolling mill according to claim 17, wherein the upper roll is composed of a work roll and at least one support roll, and the sliding bearing is disposed between the support roll and the roll holder.

21. The rolling mill according to claim 17 or 20, wherein the lower roll is composed of a work roll and at least one support roll, and the sliding bearing is disposed between the support roll and the roll base.

22. The rolling mill according to claim 16, wherein the upper roll is composed of a work roll and at least one support roll, and the support roll is a rolling bearing composed of an inner ring and an outer ring.

23. The rolling mill according to claim 16 or 22, wherein the lower roll is composed of a work roll and at least one support roll, and the support roll is a rolling bearing composed of inner and outer cymbals.

24. The rolling mill according to any one of claims 15 to 23, wherein the middle portion of the upper and lower beams is provided with the reduction device.

25. The rolling mill according to any one of claims 15 to 23, wherein the reduction device (6) is provided only in a middle portion of the upper crossbeam, and between the lower crossbeam and the roll holder A support pad (48 ') is provided between the support pads, which is located in the middle of the roller system and is within the range of the roller length.