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

Abstract

To provide a rolling mill, a cold rolling method and a method of manufacturing steel plate which enable suppression of vibration during rolling while suppressing wear of liner of roll chocks.SOLUTION: A cold tandem rolling mill 1 (rolling mill) includes a plurality of stands 3 to 6 which roll a steel plate 2 (rolling object material). At least one stand 3 of a plurality of stands 3 to 6 includes: at least one pair of work roll 10 (rolling roll); a work roll chock 20 (roll chock) which supports the work roll 10 rotatably; and a work roll chock liner 30 (roll chock liner) which has a first liner plate 36 attached to the work roll chock 20, a second liner plate 38 piled in a rolling direction X with respect to the first liner plate 36 and an elastic member 37 sandwiched between the first liner plate 36 and the second liner plate 38.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] For example, in a manufacturing line for cold-rolled steel sheets, vibrations may occur due to various factors during cold rolling. Since the vibrations may cause periodic fluctuations in the thickness of the steel sheets to be rolled, it is important to suppress the vibrations when they occur so as not to affect the material to be rolled.

[0003] For example, Patent Document 1 discloses cold rolling equipment and a cold rolling method that are capable of suppressing the occurrence of horizontal chattering (vibration) caused by rolling oil supplied to a stand of a rolling mill. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7020530 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in this type of rolling mill, in addition to the method of suppressing vibration by rolling oil as in the above-mentioned conventional technology, a method has been proposed in which an elastic member such as an anti-vibration rubber is attached to the liner of the roll chock provided on the stand to suppress vibration during rolling.

[0006] However, in a configuration in which an elastic member is laminated in the rolling direction and attached to the liner of the roll chock, there was a risk that the exposed surface of the elastic member opposite the roll chock would wear away, making it difficult to use industrially.

[0007] The present invention has been made in consideration 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 plate that are capable of suppressing vibration during rolling while suppressing wear of the liners of the roll chocks. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the rolling mill of the present invention is a rolling mill having a plurality of stands for rolling a material to be rolled, and at least one of the plurality of stands is equipped with a roll chock liner having at least a pair of rolling rolls, a roll chock for rotatably supporting the rolling rolls, a first liner plate attached to the roll chock, a second liner plate stacked in the rolling direction relative to the first liner plate, and an elastic member sandwiched between the first liner plate and the second liner plate.

[0009] Further, the plurality of stands are provided with the first liner plate, the second liner plate, and the roll chock liner having the elastic member.

[0010] In addition, the first liner plate is fastened to the roll chocks via a fastener penetrating in the rolling direction, and the second liner plate and the elastic member are provided with openings that accommodate heads of the fasteners.

[0011] Moreover, a cold rolling method according to the present invention includes a step of cold rolling a material to be rolled using the above-mentioned rolling mill.

[0012] Moreover, a method for producing a steel sheet according to the present invention includes a step of producing a steel sheet as a material to be rolled using the above-mentioned cold rolling method. Effect of the Invention

[0013] According to the present invention, by sandwiching an elastic member between a first liner plate and a second liner plate stacked in the rolling direction, it is possible to prevent the elastic member from being exposed on the side opposite to the roll chock and wearing down. This makes it possible to provide a rolling mill, a cold rolling method, and a method for manufacturing a steel plate that are capable of suppressing vibration during rolling while suppressing wear of the liners of the roll chocks. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an exemplary schematic configuration diagram of a rolling mill according to an embodiment. [Diagram 2] FIG. 2 is an exemplary schematic cross-sectional view of a stand of a rolling mill according to an embodiment. [Diagram 3] FIG. 3 is an enlarged view of the roll chock liner of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Exemplary embodiments of the present invention are disclosed below. The configurations of the embodiments described below and the actions and effects brought about by the configurations are merely examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the configurations.

[0016] In this specification, ordinal numbers are used only to distinguish between parts, members, parts, positions, directions, etc., and do not indicate order or priority.

[0017] [Embodiment] 1 is an exemplary schematic diagram of a cold tandem rolling mill 1 according to an embodiment. The cold tandem 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 material to be rolled by the cold tandem rolling mill 1, but the present invention is not limited to this example and may be applied to aluminum plates or other metal plates. The steel plate 2 is, for example, an electromagnetic steel plate, a stainless steel plate, a high carbon steel plate, or other steel type that is generally prone to vibration.

[0018] 1, a cold tandem rolling mill 1 includes, for example, a plurality of stands 3-6 that cold roll a steel sheet 2. The plurality of stands 3-6 are lined up along the rolling direction X (transport direction) of the steel sheet 2. Note that the number of stands 3-6 is not limited to four, and may be, for example, one, two, three, or five or more.

[0019] Each of the multiple stands 3 to 6 has a pair of work rolls 10, a pair of intermediate rolls 11, and a pair of backup rolls 12. The work rolls 10, intermediate rolls 11, and backup rolls 12 are aligned 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.

[0020] In the tandem cold rolling mill 1, tension rolls, diff rolls, thickness gauges, shape gauges, etc. (not shown) are appropriately installed between adjacent stands 3 to 6. The configuration of the tandem cold rolling mill 1 and the conveying device for the steel sheet 2 are not particularly limited, and publicly known techniques may be applied as appropriate.

[0021] Fig. 2 is an exemplary schematic configuration diagram of the stand 3 of the cold tandem rolling mill 1 of the embodiment. As shown in Fig. 2, the stand 3 further includes, for example, a work roll chock 20, a work roll chock liner 30, an intermediate roll chock 21, an intermediate roll chock liner 31, a backup roll chock 22, a backup roll chock liner 32, a mill housing 40, and the like.

[0022] The work roll chocks 20 are provided at both ends of the pair of work rolls 10 in the axial direction (perpendicular to the paper surface of FIG. 2). The work roll chocks 20 support the work rolls 10 rotatably about an axis extending in the direction perpendicular to the paper surface of FIG. 2. In addition, at both ends of the work roll chocks 20 in the rolling direction X, recesses 20a are provided that are recessed toward the center side (the work roll 10 side) in the rolling direction X. A work roll chock liner 30, which will be described later, is disposed in the recesses 20a. In this embodiment, the work rolls 10 are an example of a rolling roll, the work roll chocks 20 are an example of a roll chock, and the work roll chock liner 30 is an example of a roll chock liner.

[0023] The intermediate roll chocks 21 are provided at both ends of the pair of intermediate rolls 11 in the axial direction (perpendicular to the plane of FIG. 2). The intermediate roll chocks 21 support the intermediate rolls 11 rotatably about their axes. In addition, at both ends of the intermediate roll chocks 21 in the rolling direction X, recesses 21a are provided that are recessed toward the center side in the rolling direction X (the intermediate roll 11 side). Intermediate roll chock liners 31 are arranged in the recesses 21a.

[0024] The backup roll chocks 22 are provided at both ends of the pair of backup rolls 12 in the axial direction (perpendicular to the plane of FIG. 2). The backup roll chocks 22 support the backup rolls 12 rotatably about their axes. In addition, at both ends of the backup roll chocks 22 in the rolling direction X, recesses 22a are provided that are recessed toward the center side (backup roll 12 side) in the rolling direction X. A backup roll chock liner 32 is arranged in the recesses 22a.

[0025] The mill housing 40 has a pair of side walls 40a, 40b arranged on both sides in the rolling direction X of the work roll chocks 20, the intermediate roll chocks 21, and the backup roll chocks 22. A small clearance is provided between the pair of side walls 40a, 40b and the work roll chocks 20, the intermediate roll chocks 21, and the backup roll chocks 22, respectively, in order to facilitate the replacement work of each of the roll chocks 20, 21, and 22.

[0026] The mill housing 40 is provided with a plurality of project blocks 41 protruding 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 have, for example, a project block liner that abuts against the work roll chock liner 30, and absorb the backlash (clearance) between the mill housing 40 and the work roll chock 20.

[0027] In addition, the project blocks 41 can also be provided, for example, between the mill housing 40 and the intermediate roll chock 21 and between the mill housing 40 and the backup roll chock 22.

[0028] Fig. 3 is an enlarged view of the work roll chock liner 30 in Fig. 2. As shown in Fig. 3, the work roll chock liner 30 has, 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 in the rolling direction X with respect to the first liner plate 36.

[0029] The first liner plate 36 is configured in a rectangular plate shape extending along the bottom of the recess 20a of the work roll chock 20. The first liner plate 36 is provided with an opening 36a through which a shaft 50b of a fastener 50 passes in the rolling direction X. The fastener 50 is a fixing member such as a bolt or a screw, and fixes the work roll chock liner 30 and the work roll chock 20 together. The first liner plate 36 and the second liner plate 38 are configured, for example, from a metal material.

[0030] In this 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 the overall thickness of the work roll chock liner 30, so as to ensure the rigidity and strength required for fastening by the fasteners 50. In this embodiment, the thickness of the elastic member 37 is set to be approximately the same as the thickness W2 of the second liner plate 38.

[0031] The second liner plate 38 is positioned on the opposite side of the first liner plate 36 from the work roll chock 20 in the rolling direction X. The second liner plate 38 is configured in a rectangular plate shape extending along the first liner plate 36. The second liner plate 38 is provided with an opening 38a in which the head 50a of the fastener 50 is accommodated. The opening 38a is configured as, for example, a circular hole (relief hole) one size larger than the head 50a of the fastener 50.

[0032] The elastic member 37 is, for example, a vibration-proof rubber, and is positioned between the first liner plate 36 and the second liner plate 38 in the rolling direction X. The elastic member 37 is configured in a rectangular plate shape extending along the first liner plate 36, and is, for example, adhesively fixed to the first liner plate 36 and the second liner plate 38. The elastic member 37 is capable of absorbing vibrations along the rolling direction X by elastically deforming between the first liner plate 36 and the second liner plate 38.

[0033] Further, the elastic member 37 is provided with an opening 37a for accommodating the head 50a of the fastener 50. The opening 37a is configured, for example, as a round hole (relief hole) that is slightly larger than the head 50a of the fastener 50, and is aligned with the opening 38a of the second liner plate 38 in the rolling direction X. In this embodiment, the fastener 50 fastens only the first liner plate 36, not the entire work roll chock liner 30, thereby preventing the fastening of the fastener 50 from being loosened by the elastic force of the elastic member 37.

[0034] In this embodiment, the combined thickness of the elastic member 37 and the second liner plate 38 is set to be thicker than the thickness of the head 50a of the fastener 50. In other words, the elastic member 37 and the second liner plate 38 are set to a thickness such that the head 50a of the fastener 50 does not protrude in the rolling direction X from the openings 37a, 38a.

[0035] In addition, in the present embodiment, the first liner plate 36, the second liner plate 38, and the elastic member 37 are provided on the work roll chock liner 30, but the present invention is not limited to this example, and they may be provided on the intermediate roll chock liner 31 or the backup roll chock liner 32 shown in Fig. 2. In other words, it is sufficient that the first liner plate 36, the second liner plate 38, and the elastic member 37 are provided on at least one of the work roll chock liner 30, the intermediate roll chock liner 31, and the backup roll chock liner 32.

[0036] In this embodiment, for example, the work roll chock liner 30 of the other stands 4 to 6 other than the stand 3 is provided with a first liner plate 36, a second liner plate 38, and an elastic member 37. The configurations of the other stands 4 to 6 are substantially the same as the configuration of the above-mentioned stand 3. The number of stands 3 to 6 in which the first liner plate 36, the second liner plate 38, and the elastic member 37 are provided is not limited to four, and may be, for example, one, two, or three.

[0037] As described above, in this embodiment, the cold tandem rolling mill 1 (rolling mill) has a plurality of stands 3-6 that roll a steel plate 2 (material to be rolled), and at least one stand 3 of the plurality of stands 3-6 has at least a pair of work rolls 10 (rolling rolls), a work roll chock 20 (roll chock) that rotatably supports the work roll 10, and a work roll chock liner 30 (roll chock liner) having a first liner plate 36 attached to the work roll chock 20, a second liner plate 38 stacked in the rolling direction X relative to the first liner plate 36, and an elastic member 37 sandwiched between the first liner plate 36 and the second liner plate 38.

[0038] According to such a configuration, for example, by sandwiching the elastic member 37 between the first liner plate 36 and the second liner plate 38 that are stacked in the rolling direction X, it is possible to prevent the elastic member 37 from being exposed and worn on the side opposite to the work roll chock 20 (the project block 41 side of the mill housing 40). This makes it possible to provide a cold tandem rolling mill 1, a cold rolling method, and a manufacturing method for a steel plate 2 that are capable of suppressing wear of the work roll chock liners 30 while suppressing vibration during rolling.

[0039] In this embodiment, the plurality of stands 3 to 6 are provided with work roll chock liners 30 each having a first liner plate 36, a second liner plate 38, and an elastic member 37.

[0040] According to such a configuration, for example, vibration during rolling can be suppressed by elastic members 37 provided on the work roll chock liners 30 of multiple stands 3 to 6, and thus periodic fluctuations in the thickness of the steel plate 2 due to vibration during rolling can be more reliably suppressed.

[0041] In addition, in this embodiment, the first liner plate 36 is fastened to the work roll chocks 20 via fasteners 50 that penetrate in the rolling direction X, and the second liner plate 38 and the elastic member 37 are provided with openings 38a, 37a that accommodate heads 50a of the fasteners 50.

[0042] According to this configuration, for example, it is possible to fasten only the first liner plate 36 rather than the entire work roll chock liner 30, thereby preventing the fastening device 50 from loosening due to the elastic force of the elastic member 37.

[0043] Although the embodiment of the present invention has been illustrated above, the above embodiment is merely an example and is not intended to limit the scope of the invention. The above embodiment can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the gist of the invention. In addition, the specifications of each configuration and shape (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented. [Explanation of symbols]

[0044] 1...Cold tandem rolling mill (rolling mill) 2...Steel plate (rolling material) 3~6…Stand 10...Work roll (rolling roll) 20...Work roll chock (roll chock) 30...Work roll chock liner (roll chock liner) 36…First liner plate 37...Elastic member 38…Second liner plate 50…Fastener 50a…Head X: Rolling direction

Claims

1. A rolling mill having a plurality of stands for rolling a material to be rolled, At least one stand of the plurality of stands is At least one pair of rolling rolls; A roll chock that rotatably supports the rolling roll; A roll chock liner including a first liner plate attached to the roll chock, a second liner plate stacked in the rolling direction relative to the first liner plate, and an elastic member sandwiched between the first liner plate and the second liner plate; Equipped with The first liner plate is fastened to the roll chock via a fastener penetrating in the rolling direction, The second liner plate and the elastic member are provided with an opening for receiving a head of the fastener.

2. 2. The rolling mill according to claim 1, wherein the plurality of stands are provided with the first liner plate, the second liner plate, and the roll chock liner having the elastic member.

3. A cold rolling method comprising the step of cold rolling a material to be rolled using the rolling mill according to claim 1 or 2.

4. A method for producing a steel plate, comprising the step of producing a steel plate as a material to be rolled by using the cold rolling method according to claim 3.

Images