Rolling mill, cold rolling method, and method for manufacturing steel sheet

Abstract

A tandem cold mill (1) is provided with a plurality of stands (3-6) for rolling a steel plate (2) (material to be rolled), and at least one stand (3) of the plurality of stands (3-6) is provided with at least one pair of working rolls (10) (rolls), a working roll bearing block (20) (roll bearing block) for rotatably supporting the working rolls (10), and a working roll bearing block bush (30) (roll bearing block bush). The first lining plate 36 is installed on a working roller bearing seat 20, the second lining plate 38 is laminated on the first lining plate 36 in the rolling direction X, and the elastic component 37 is clamped between the first lining plate 36 and the second lining plate 38.

Description

Technical Field

[0001] The present invention relates to a rolling mill, a cold rolling method and a method for manufacturing a steel plate. Background Art

[0002] For example, in a production line for cold-rolled steel sheets, vibrations may occur during cold rolling due to various reasons. The thickness of the steel sheet, which is the rolling object, may change periodically due to the vibrations, so it is important to suppress the vibrations when they occur and not to affect the rolling object.

[0003] For example, Patent Document 1 discloses a cold rolling facility and a cold rolling method capable of suppressing chatter (vibration) in the horizontal direction caused by rolling oil supplied to the stands of a rolling mill.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 7020530 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in this kind of rolling mill, in addition to the method of suppressing vibration caused by rolling oil as in the above-mentioned prior art, a method of suppressing vibration during rolling by installing elastic components such as vibration-isolating rubber on the bushing of the roll bearing seat provided in the frame has been proposed.

[0009] However, in a structure in which the elastic member is laminated and mounted on the bushing of the chock in the rolling direction, the exposed surface of the elastic member on the side opposite to the chock may be worn, making it difficult to use industrially.

[0010] The present invention has been made in view of the above problems, and an object of the present invention is to provide a rolling mill, a cold rolling method, and a method for manufacturing a steel sheet that can suppress vibration during rolling while suppressing wear of a bushing of a chock.

[0011] Means for solving problems

[0012] The rolling mill of the present invention has a plurality of stands for rolling a rolling object material, wherein at least one of the plurality of stands has: at least one pair of rolls; a roll bearing seat for rotatably mounting the rolls; and a roll bearing seat bushing, which has a first lining plate mounted on the roll bearing seat, a second lining plate stacked on the first lining plate along a rolling direction, and an elastic member sandwiched between the first lining plate and the second lining plate.

[0013] The chock bushing including the first lining plate, the second lining plate, and the elastic member may be provided on the plurality of frames.

[0014] The first liner plate may be fastened to the chock via a fastener penetrating in the rolling direction, and the second liner plate and the elastic member may be provided with an opening for accommodating a head of the fastener.

[0015] The cold rolling method of the present invention includes the step of cold rolling a rolling target material using the above-mentioned rolling mill.

[0016] The method for producing a steel plate of the present invention includes the step of producing a steel plate as a rolling target material using the above-mentioned cold rolling method.

[0017] Effects of the Invention

[0018] According to the present invention, by sandwiching the elastic member between the first liner and the second liner stacked in the rolling direction, it is possible to prevent the elastic member from being exposed to the side opposite to the chock and being worn. Thus, it is possible to provide a rolling mill, a cold rolling method, and a method for manufacturing a steel plate that can suppress vibration during rolling while suppressing wear of the chock bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an illustrative and schematic structural diagram of a rolling mill according to an embodiment.

[0020] Figure 2 It is an illustrative and schematic cross-sectional view of a stand of a rolling mill according to an embodiment.

[0021] Figure 3 yes Figure 2 Magnified view of the chock bushing. DETAILED DESCRIPTION

[0022] Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below and the action and effect brought about by the configuration are examples. The present invention can also be implemented by configurations other than the configuration disclosed in the following embodiments. In addition, according to the present invention, at least one of the various effects (including derived effects) obtained by the configuration can be obtained.

[0023] In this specification, ordinal numbers are used only to distinguish parts, components, locations, positions, directions, etc., and do not indicate order or priority.

[0024] [Implementation Method]

[0025] Figure 11 is an illustrative and schematic structural diagram of a cold rolling mill 1 according to an embodiment. The cold rolling mill 1 is an example of a rolling mill. In the following description, a steel plate 2 is taken as an example of a rolling object material rolled by the tandem cold rolling mill 1, but the present invention is not limited to this example, and an aluminum plate, other metal plates, etc. may also be applied. The steel plate 2 is, for example, an electromagnetic steel plate, a stainless steel plate, a high carbon steel plate, and other steel types that are generally prone to vibration.

[0026] like Figure 1 As shown, the cold rolling mill 1 includes, for example, a plurality of stands 3 to 6 for cold rolling a steel plate 2. The plurality of stands 3 to 6 are arranged along a rolling direction X (transport direction) of the steel plate 2. The number of stands 3 to 6 is not limited to four, and may be, for example, one, two, three, or five or more.

[0027] The plurality of stands 3 to 6 each include a pair of work rolls 10, a pair of intermediate rolls 11, and a pair of backup rolls 12. The work rolls 10, the intermediate rolls 11, and the backup rolls 12 are arranged in a vertical direction intersecting the rolling direction X. Each of the stands 3 to 6 is a so-called 6Hi type rolling stand in which the intermediate rolls 11 are provided between the work rolls 10 and the backup rolls 12.

[0028] In the cold rolling mill 1, tension rolls, differential rolls, plate thickness gauges, shape gauges, etc. (not shown) are appropriately provided between adjacent stands 3 to 6. The configuration of the cold rolling mill 1 and the conveying device of the steel plate 2 are not particularly limited, and known techniques can be appropriately applied.

[0029] Figure 2 1 is an exemplary and schematic structural diagram of the frame 3 of the cold rolling mill 1 according to the embodiment. Figure 2 As shown, the frame 3 also has, for example, a working roll bearing seat 20, a working roll bearing seat bushing 30, an intermediate roll bearing seat 21, an intermediate roll bearing seat bushing 31, a backup roll bearing seat 22, a backup roll bearing seat bushing 32, a rolling mill housing 40, etc.

[0030] The work roll bearing seat 20 is arranged in the axial direction of a pair of work rolls 10 ( Figure 2 The work roll bearing seat 20 allows the work roll 10 to be able to be wound along the same direction as the work roll bearing seat 20. Figure 2 The work roll bearing 20 is supported in a manner of rotation about an axis extending in a direction perpendicular to the paper surface. In addition, a recessed portion 20a recessed toward the center side (the work roll 10 side) in the rolling direction X is provided at both ends of the work roll bearing 20. A work roll bearing liner 30 described later is arranged in the recessed portion 20a. In the present embodiment, the work roll 10 is an example of a rolling roll, the work roll bearing 20 is an example of a roll bearing liner, and the work roll bearing liner 30 is an example of a roll bearing liner.

[0031] The intermediate roller bearing seat 21 is arranged in the axial direction ( Figure 2The intermediate roll bearing seat 21 supports the intermediate roll 11 in a manner that it can rotate around the axis. In addition, at both ends of the intermediate roll bearing seat 21 in the rolling direction X, there are recessed portions 21a that are recessed toward the center side (intermediate roll 11 side) in the rolling direction X. The intermediate roll bearing seat bushing 31 is arranged in the recessed portion 21a.

[0032] The support roller bearing seat 22 is arranged in the axial direction ( Figure 2 The support roller chock 22 supports the support roller 12 in a manner that allows rotation around the axis. In addition, at both ends of the support roller chock 22 in the rolling direction X, there are provided concave portions 22a that are recessed toward the center side (the support roller 12 side) in the rolling direction X. The support roller chock bushing 32 is disposed in the concave portion 22a.

[0033] The mill housing 40 has a pair of side walls 40a and 40b arranged on both sides of the work roll chocks 20, the intermediate roll chocks 21, and the backup roll chocks 22 in the rolling direction X. In order to facilitate the replacement of the roll chocks 20, 21, and 22, a small gap is provided between the pair of side walls 40a and 40b and the work roll chocks 20, the intermediate roll chocks 21, and the backup roll chocks 22.

[0034] In addition, the mill housing 40 is provided with a plurality of project blocks 41 projecting from a pair of side walls 40a, 40b toward the center side (the work roll 10 side) in the rolling direction X. The project blocks 41 include, for example, project block bushings that abut against the work roll chock bushings 30, and are used to absorb the looseness (clearance) between the mill housing 40 and the work roll chock 20.

[0035] The bosses 41 may be provided, for example, respectively between the mill housing 40 and the intermediate roll chock 21 and between the mill housing 40 and the backup roll chock 22 .

[0036] Figure 3 yes Figure 2 An enlarged view of the work roll bearing seat bushing 30. Figure 3 As shown, the work roll chock bushing 30 includes, for example, a first liner plate 36, a second liner plate 38, and an elastic member 37. The elastic member 37 and the second liner plate 38 are stacked on the first liner plate 36 in the rolling direction X.

[0037] The first liner plate 36 is formed in a rectangular plate shape extending along the bottom of the recessed portion 20a of the work roll chock 20. The first liner plate 36 is provided with an opening portion 36a through which the shaft portion 50b of the fastener 50 passes in the rolling direction X. The fastener 50 is, for example, a fixing member such as a bolt or a screw, and is used to fix the work roll chock bushing 30 and the work roll chock 20. The first liner plate 36 and the second liner plate 38 are formed of, for example, a metal material.

[0038] In the present embodiment, the thickness W1 of the first liner plate 36 is set to be thicker than the thickness W2 of the second liner plate 38 and the thickness of the elastic member 37. Specifically, the thickness W1 of the first liner plate 36 is set to be approximately half of the overall thickness of the work roll chock bushing 30, and the rigidity and strength for fastening by the fastener 50 are ensured. In the present embodiment, the thickness of the elastic member 37 is set to be substantially the same as the thickness W2 of the second liner plate 38.

[0039] The second liner plate 38 is located on the side of the first liner plate 36 opposite to the work roll chock 20 in the rolling direction X. The second liner plate 38 is configured as a rectangular plate extending along the first liner plate 36. The second liner plate 38 is provided with an opening 38a for accommodating the head 50a of the fastener 50. The opening 38a is configured as a round hole (avoidance hole) that is slightly larger than the head 50a of the fastener 50, for example.

[0040] The elastic member 37 is, for example, a vibration-isolating rubber, and is located between the first lining plate 36 and the second lining plate 38 in the rolling direction X. The elastic member 37 is configured as a rectangular plate extending along the first lining plate 36, and is, for example, bonded and fixed to the first lining plate 36 and the second lining plate 38. The elastic member 37 can absorb vibration along the rolling direction X by elastically deforming between the first lining plate 36 and the second lining plate 38.

[0041] In addition, the elastic member 37 is provided with an opening 37a for accommodating the head 50a of the fastener 50. The opening 37a is configured as, for example, a round hole (avoidance hole) that is slightly larger than the head 50a of the fastener 50, and is aligned with the opening 38a of the second liner 38 in the rolling direction X. In the present embodiment, the fastener 50 does not fasten the entire work roll chock bushing 30, but fastens only the first liner 36, thereby preventing the fastener 50 from loosening due to the elastic force of the elastic member 37.

[0042] In this embodiment, the combined thickness of the elastic member 37 and the second lining plate 38 is set thicker than the thickness of the head 50a of the fastener 50. That is, the elastic member 37 and the second lining plate 38 are set to such a thickness that the head 50a of the fastener 50 does not protrude from the openings 37a, 38a in the rolling direction X.

[0043] In addition, in the present embodiment, the case where the first liner 36, the second liner 38, and the elastic member 37 are provided on the work roll bearing housing bushing 30 is exemplified, but the present invention is not limited to this example and may also be provided on Figure 2The intermediate roll bearing seat bushing 31 and the backup roll bearing seat bushing 32 are shown. In other words, it is sufficient to provide the first liner 36, the second liner 38 and the elastic member 37 on at least one of the work roll bearing seat bushing 30, the intermediate roll bearing seat bushing 31 and the backup roll bearing seat bushing 32.

[0044] In addition, in the present embodiment, for the other frames 4 to 6 other than the frame 3, for example, the first lining plate 36, the second lining plate 38, and the elastic member 37 are also provided on the work roll bearing seat bushing 30. The configuration of the other frames 4 to 6 is substantially the same as that of the above-mentioned frame 3. The number of frames 3 to 6 provided with the first lining plate 36, the second lining plate 38, and the elastic member 37 is not limited to four, and may be one, two, or three, for example.

[0045] As described above, in the present embodiment, the cold rolling mill 1 (rolling mill) includes a plurality of stands 3 to 6 for rolling a steel plate 2 (rolling target material), and at least one stand 3 among the plurality of stands 3 to 6 includes: at least one pair of work rolls 10 (rolling rolls), a work roll bearing seat 20 (rolling roll bearing seat) for rotatably supporting the work rolls 10, and a work roll bearing seat bushing 30 (rolling roll bearing seat bushing), which includes a first liner 36 mounted on the work roll bearing seat 20, a second liner 38 stacked on the first liner 36 in the rolling direction X, and an elastic member 37 sandwiched between the first liner 36 and the second liner 38.

[0046] With such a configuration, for example, by placing the elastic member 37 between the first liner 36 and the second liner 38 stacked in the rolling direction X, it is possible to suppress the elastic member 37 from being exposed to the side opposite to the work roll chock 20 (the boss 41 side of the mill housing 40) and being worn. Thus, it is possible to provide a cold rolling mill 1, a cold rolling method, and a method for manufacturing a steel plate 2 that can suppress wear of the work roll chock bushing 30 and vibration during rolling.

[0047] Furthermore, in the present embodiment, the work roll chock bushing 30 including the first liner plate 36 , the second liner plate 38 and the elastic member 37 is provided in the plurality of frames 3 to 6 .

[0048] With such a configuration, for example, the elastic member 37 provided in the work roll bearing bushing 30 of the plurality of stands 3 to 6 can be used to suppress vibration during rolling, thereby more reliably suppressing periodic variation in the thickness of the steel plate 2 due to vibration during rolling.

[0049] In the present embodiment, the first liner 36 is fastened to the work roll chock 20 via the fastener 50 penetrating in the rolling direction X, and the second liner 38 and the elastic member 37 are provided with openings 38 a and 37 a for accommodating the head 50 a of the fastener 50 .

[0050] With such a configuration, for example, only the first liner plate 36 can be fastened instead of the entire work roll chock bushing 30 , so that loosening of the fastener 50 can be suppressed by the elastic force of the elastic member 37 .

[0051] The above examples illustrate the embodiments of the present invention, but the above embodiments are examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other ways, and various omissions, substitutions, combinations, and changes can be made without departing from the scope of the main purpose of the invention. In addition, the specifications such as each composition and shape (structure, type, direction, form, size, length, width, thickness, height, quantity, configuration, position, material, etc.) can be appropriately changed and implemented.

[0052] Industrial Applicability

[0053] According to the present invention, it is possible to provide a rolling mill, a cold rolling method, and a method for manufacturing a steel sheet that can suppress wear of a chock bushing and vibration during rolling.

[0054] Description of Reference Numerals

[0055] 1. Cold rolling mill (rolling mill)

[0056] 2. Steel plate (rolling material)

[0057] 3~6, rack

[0058] 10. Working roll (roller)

[0059] 20. Working roll bearing seat (roller bearing seat)

[0060] 30. Work roll bearing seat bushing (roller bearing seat bushing)

[0061] 36. First lining plate

[0062] 37. Elastic components

[0063] 38. Second lining plate

[0064] 50. Fasteners

[0065] 50a. Head

[0066] X, rolling direction

Claims

1. A rolling mill comprising a plurality of stands for rolling a rolling object material, wherein: At least one of the plurality of racks comprises: at least one pair of rollers; A roller bearing seat for rotatably supporting the roller; A chock bushing includes a first liner plate mounted on the chock, a second liner plate stacked on the first liner plate in a rolling direction, and an elastic member sandwiched between the first liner plate and the second liner plate.

2. The rolling mill according to claim 1, wherein: The chock bushing including the first lining plate, the second lining plate, and the elastic member is provided on the plurality of frames.

3. The rolling mill according to claim 1, wherein: The first liner is fastened to the roll bearing seat via a fastener penetrating in the rolling direction. The second backing plate and the elastic member are provided with an opening for accommodating a head of the fastener.

4. The rolling mill according to claim 2, wherein: The first liner is fastened to the roll bearing seat via a fastener penetrating in the rolling direction. The second backing plate and the elastic member are provided with an opening for accommodating a head of the fastener.

5. A cold rolling method comprising the step of cold rolling a rolling target material using the rolling mill according to claim 1.

6. A method for producing a steel plate, comprising the step of producing a steel plate as a rolling object material using the cold rolling method according to claim 5.

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