Rolling mill

Abstract

To provide a rolling mill capable of efficiently rolling a hard material having high product quality.SOLUTION: The arm 15 is rockably and axially slidably connected to the intermediate roll bearings 4 on the operating side and the driving side of the intermediate rolls 3 through a connecting shaft 16, the pass direction position of the arm 15 is adjusted and supported by a side block 17 capable of adjusting the pass direction position, the intermediate rolls 3 are shifted in the roll axial direction together with the intermediate roll bearings 4 and the connecting shaft 16 at the time of shift in the roll axial direction of each intermediate roll 3, and the arm 15 stays without shifting in the axial direction by sliding on the connecting shaft 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rolling mill equipped with an intermediate roll shifting function for rolling strips, and particularly to a rolling mill suitable for producing hard materials with high productivity and high product quality. [Background technology]

[0002] Patent Document 1 describes a six-high rolling mill having a pair of housings, a pair of small, vertically inline, freely floating working rolls, backup rolls mounted in chocks, intermediate rolls disposed inline with the working rolls and backup rolls and mounted in chocks between the working rolls and backup rolls, lateral support roll assemblies mounted on both sides of each working roll, support arms supporting each lateral support roll assembly, each support arm allowing the lateral support roll assemblies to move laterally toward the working rolls, spacers for adjusting the lateral position of the lateral support roll assemblies, and side support beams providing support for the spacers and support arms, the lateral support arms being assembled integrally with the intermediate roll chocks, and the lateral support roll assemblies and support arms being sized to fit within the width of the intermediate roll chocks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 15005 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, a rolling mill using small diameter work rolls for rolling hard materials has been devised, as disclosed in Patent Document 1. In this rolling mill, a driving tangential force from the intermediate roll drive is applied to the small diameter work rolls, so support rolls are provided on the entry and exit sides of the small diameter work rolls to prevent deflection of the small diameter work rolls. The six-high rolling mill disclosed in Patent Document 1 is designed so that the intermediate rolls can be shifted in the axial direction to control the plate shape.

[0005] In the six-high rolling mill of Patent Document 1, when the intermediate rolls shift in the axial direction, the support rolls and the arms to which they are fixed are fixed in the axial direction to the intermediate roll bearings via support shafts, and only the intermediate rolls shift in the axial direction.

[0006] In this structure, a normal inner race structure cannot be applied to the bearing incorporating the intermediate roll bearing, and the rollers of the bearing and the intermediate roll neck shaft portion must rotate about their axis and slide in the axial direction.

[0007] For this reason, the surface of the intermediate roll neck shaft portion needs to have high hardness, and this has been achieved by either directly heat treating the surface of the intermediate roll neck shaft portion to ensure high hardness, or by shrink-fitting an inner race with a high surface hardness.

[0008] However, with the recent need for increased plate width (from 4 feet to 5 feet), the overall length of intermediate rolls has also become longer, which has increased the difficulty in manufacturing intermediate rolls due to the special requirements mentioned above, which has resulted in a corresponding increase in costs and in some cases has made manufacturing difficult.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rolling mill capable of efficiently rolling hard materials with high product quality in order to solve the above problems. [Means for solving the problem]

[0010] The present invention includes a plurality of means for solving the above-mentioned problems. One example of such a rolling mill includes a pair of work rolls for rolling a strip, a pair of intermediate roll groups supporting the work rolls, a pair of backup rolls supporting the intermediate roll groups, a shift device for independently shifting each of the intermediate roll groups in the roll axial direction, and a support roll group or a support bearing for supporting the work rolls on the entry side and / or the exit side of the work rolls, wherein the support roll group or the support bearing is held by an arm, and the arm is connected to the intermediate roll bearings on the operating side and the drive side of each intermediate roll of the intermediate roll group via a connecting shaft so as to be swingable and slidable in the axial direction, and the position of the arm in the pass direction is adjusted and supported by a side block whose position in the pass direction is adjustable, and when each of the intermediate rolls shifts in the roll axial direction, the intermediate roll shifts in the roll axial direction together with the intermediate roll bearings and the connecting shaft, and the arm slides on the connecting shaft and remains without shifting in the axial direction. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a rolling mill capable of efficiently rolling hard materials with high product quality. Objects, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view of a six-high rolling mill according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1, showing positions of the intermediate roll before and after shifting. [Figure 3] This is a view corresponding to the cross section of a conventional six-high rolling mill taken along the line AA in FIG. 1, and shows the positions of the intermediate rolls before and after shifting. [Figure 4] FIG. 2 is a cross-sectional view taken along the arrow BB in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along the arrow CC in FIG. [Figure 6] FIG. 4 is a front view of an eight-high rolling mill according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view taken along the arrow DD in FIG. 6. [Figure 8] FIG. 10 is a front view of a six-high rolling mill according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along the arrows EE in FIG. 8. [Figure 10] FIG. 9 is a cross-sectional view taken along the arrow FF in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the rolling mill of the present invention will be described below with reference to the drawings.

[0014] In the drawings used in this specification, identical or corresponding components are denoted by the same or similar reference numerals, and repeated explanations of these components may be omitted. Also, in the drawings, reference numerals enclosed in "()" indicate the components on the back side.

[0015] <First Example> A first embodiment of the rolling mill of the present invention will be described with reference to Figures 1 to 5. Figure 1 is a front view of a six-high rolling mill according to this first embodiment when viewed from the operation side to the drive side, Figure 2 is a cross-sectional view taken along the line AA in Figure 1, showing positions of intermediate rolls before and after shifting in the present invention, Figure 3 is a cross-sectional view of a conventional six-high rolling mill corresponding to the line AA in Figure 1, showing positions of intermediate rolls before and after shifting, Figure 4 is a cross-sectional view taken along the line BB in Figure 1, and Figure 5 is a cross-sectional view taken along the line CC in Figure 1.

[0016] First, the overall configuration of the rolling mill will be described with reference to FIG.

[0017] As shown in FIGS. 1 and 4, the rolling mill 100 of the first embodiment is a six-high rolling mill, and a strip 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2a, 2b.

[0018] These upper and lower work rolls 2a, 2b are supported in contact with a pair of upper and lower intermediate rolls 3a, 3b, respectively. Therefore, in this embodiment, the intermediate roll group is made up of a pair of intermediate rolls 3a, 3b that support the work rolls 2a, 2b.

[0019] Furthermore, the pair of upper and lower intermediate rolls 3a, 3b are supported in contact with a pair of upper and lower backup rolls 5a, 5b, respectively.

[0020] Furthermore, the vertically upper backup roll 5a is supported by bearings and backup roll bearing chocks 6a, 6b, which are omitted for convenience of illustration. These backup roll bearing chocks 6a, 6b are supported by housings 9a, 9b via pass line adjustment devices 7a, 7b, which are composed of worm jacks or tapered wedges and stepped rocker plates, etc. Here, a load cell can be built into the pass line adjustment devices 7a, 7b to measure the rolling load.

[0021] The vertically lower backup roll 5b is supported by bearings and backup roll bearing chocks 6c and 6d (not shown in the figure), which are in turn supported by housings 9a and 9b via pressure reduction hydraulic cylinders 8a and 8b.

[0022] Here, the pair of upper and lower intermediate rolls 3a, 3b have tapered roll shoulders 3c, 3d at the roll barrel end positions that are vertically symmetrical with respect to the strip width center of the strip 1. Intermediate roll bearings 4a, 4b are attached to the roll neck portion of the upper intermediate roll 3a via bearings 22a, 22b, and intermediate roll bearings 4c, 4d are attached to the roll neck portion of the lower intermediate roll 3b via bearings.

[0023] The intermediate roll 3a can be shifted in the axial direction by shift cylinders 26a and 26b, using the shift frames 23a and 23b as guides, via hooks 27a and 27b attached to a bearing housing that houses the drive-side intermediate roll bearing 4b, shift frame hooks 25a and 25b, and the shift block 24. Similarly, the intermediate roll 3b can be shifted in the axial direction by shift cylinders, using the shift frames as guides, via hooks attached to a bearing housing that houses the drive-side intermediate roll bearing 4d, shift frame hooks, and shift blocks.

[0024] The intermediate roll bearings 4a and 4b of the intermediate roll 3a are respectively equipped with bending cylinders 30a and 30b that impart roll bending. This imparts roll bending to the intermediate roll 3a. Similarly, the intermediate roll bearings 4c and 4d of the intermediate roll 3b are respectively equipped with bending cylinders 30c and 30d that impart roll bending. This imparts roll bending to the intermediate roll 3b.

[0025] The shifting and roll bending of the tapered roll shoulders 3c and 3d of the intermediate rolls 3a and 3b improves the strip shape quality.

[0026] The pair of upper and lower work rolls 2a, 2b are supported by a thrust bearing 10a at the operation-side shaft end and a thrust bearing 10b at the drive-side shaft end. The thrust bearings 10a, 10b are rotatably mounted via shafts 11a, 11b to brackets (not shown in the figure).

[0027] The upper work roll 2a is rotatably supported over its entire length in the strip width direction by support roll 12a on the exit side of the strip 1, and is rotatably supported over its entire length in the strip width direction by support roll 12b on the entry side of the strip 1. Support roll 12a is rotatably supported by support bearings 13a and 13b, and support roll 12b is rotatably supported by support bearings 13c and 13d. Support bearings 13a and 13b are rotatably supported by arm 15a via shafts 14a and 14b, respectively, and support bearings 13c and 13d are rotatably supported by arm 15b via shafts 14c and 14d, respectively.

[0028] The lower work roll 2b is rotatably supported over its entire length in the strip width direction by support roll 12c on the strip outlet side and by support roll 12d on the strip inlet side. Support roll 12c is rotatably supported by support bearings 13e and 13f, and support roll 12d is rotatably supported by support bearings 13g and 13h. Support bearings 13e and 13f are rotatably supported on arm 15c via shafts 14e and 14f, respectively, and support bearings 13g and 13h are rotatably supported on arm 15d via shafts 14g and 14h, respectively.

[0029] As shown in FIG. 2, on the vertically upper side of the strip 1, the arm 15a is connected to the intermediate roll bearings 4a, 4b on the operation side and drive side of the intermediate roll 3a via a connecting shaft 16a so as to be swingable and slidable in the axial direction, and the arm 15b is connected to the intermediate roll bearings 4a, 4b on the operation side and drive side of the intermediate roll 3a via a connecting shaft 16b so as to be swingable and slidable in the axial direction.

[0030] Furthermore, on the vertically lower side of the strip 1, the arm 15c is connected to the intermediate roll bearings 4c, 4d on the operation side and drive side of the intermediate roll 3b via a connecting shaft 16c so as to be swingable and slidable in the axial direction, and the arm 15d is connected to the intermediate roll bearings 4c, 4d on the operation side and drive side of the intermediate roll 3b via a connecting shaft 16d so as to be swingable and slidable in the axial direction.

[0031] Sliding liners 41a, 41b, 41c, and 41d are disposed between the arms 15a, 15b, 15c, and 15d and the connecting shafts 16a, 16b, 16c, and 16d, respectively.

[0032] In this embodiment, the lengths of the connecting shafts 16a, 16b, 16c, and 16d in the roll axis direction are longer than the lengths of the arms 15a, 15b, 15c, and 15d that they support in the roll axis direction by the shift amounts of the intermediate rolls 3a and 3b.

[0033] The position of arm 15a in the path direction is adjusted and supported by side block 17a, the position of which in the path direction is adjustable, and the position of arm 15b in the path direction is adjusted and supported by side block 17b, the position of which in the path direction is adjustable.

[0034] Furthermore, side block 17a is supported on housings 9a and 9b via tapered wedges 18a and 18b and tapered wedges 19a and 19b, and side block 17b is supported on housings 9a and 9b via tapered wedges 18c and 18d and tapered wedges 19c and 19d.

[0035] Similarly, the position of arm 15c in the path direction is adjusted and supported by side block 17c, the position of which in the path direction is adjustable, and the position of arm 15d in the path direction is adjusted and supported by side block 17d, the position of which in the path direction is adjustable.

[0036] In addition, side block 17c is supported on housings 9a and 9b via tapered wedges 18e and 18f and tapered wedges 19e and 19f, and side block 17d is supported on housings 9a and 9b via tapered wedges 18g and 18h ​​and tapered wedges 19g and 19h.

[0037] Tapered wedge 18a is inserted and removed by hydraulic cylinder 20a, tapered wedge 18b is inserted and removed by hydraulic cylinder 20b, tapered wedge 18c is inserted and removed by hydraulic cylinder 20c, tapered wedge 18d is inserted and removed by hydraulic cylinder 20d, tapered wedge 18e is inserted and removed by hydraulic cylinder 20e, tapered wedge 18f is inserted and removed by hydraulic cylinder 20f, tapered wedge 18g is inserted and removed by hydraulic cylinder 20g, and tapered wedge 18h is inserted and removed by hydraulic cylinder 20h, so that the thickness of each can be changed.

[0038] For example, when changing from a large diameter work roll to a small diameter work roll, tapered wedges 18a, 18b, 18c, 18d, 18e, 18f, 18g, and 18h ​​are pushed in, increasing their thickness, and side blocks 17a, 17b, 17c, and 17d move inward of the mill accordingly, and support rolls 12a, 12b, 12c, and 12d are also closed inside the mill via arms 15a, 15b, 15c, and 15d, connecting shafts 16a, 16b, 16c, and 16d, and support bearings 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h, and are supported in contact with work rolls 2a and 2b.

[0039] The side block 17a is provided with stoppers 21a and 21b that can be attached and detached by a cylinder or the like (not shown in the drawing). These stoppers 21a and 21b are provided to prevent the arm 15a from shifting in the axial direction of the intermediate roll 3a, and by attaching the stoppers 21a and 21b, the axial position of the arm 15a is fixed.

[0040] The side block 17b is provided with stoppers 21c and 21d that can be attached and detached by a cylinder or the like (not shown in the drawing). These stoppers 21c and 21d are provided to prevent the arm 15b from shifting in the axial direction of the intermediate roll 3a, and by attaching the stoppers 21c and 21d, the axial position of the arm 15b is fixed.

[0041] The side block 17c is provided with stoppers 21e and 21f that can be attached and detached by a cylinder or the like (not shown in the drawing). These stoppers 21e and 21f are provided to prevent the arm 15c from shifting in the axial direction of the intermediate roll 3b, and by attaching the stoppers 21e and 21f, the axial position of the arm 15c is fixed.

[0042] The side block 17d is provided with stoppers 21g and 21h that can be attached and detached by a cylinder or the like (not shown in the drawing). These stoppers 21g and 21h are provided to prevent the arm 15d from shifting in the axial direction of the intermediate roll 3b, and by attaching the stoppers 21g and 21h, the axial position of the arm 15d is fixed.

[0043] When replacing the intermediate rolls 3a, 3b, the intermediate rolls 3a, 3b are extracted from or inserted into the housings 9a, 9b as an assembly including the intermediate roll bearings 4a, 4b, 4c, 4d, the support rolls 12a, 12b, 12c, 12d, and the arms 15a, 15b, 15c, 15d. At that time, these stoppers 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h are released, and the arms 15a, 15b, 15c, 15d become movable in the axial direction.

[0044] In this embodiment, as shown in FIG. 2, when each of the intermediate rolls 3a, 3b shifts in the axial direction by δ, the intermediate rolls 3a, 3b are shifted in the roll axial direction together with the intermediate roll bearings 4a, 4b, 4c, 4d and the connecting shafts 16a, 16b, 16c, 16d that connect these.

[0045] In contrast, arms 15a, 15b, 15c, and 15d slide on connecting shafts 16a, 16b, 16c, and 16d connected thereto, and therefore do not shift axially and remain in their original positions. Similarly, support rolls 12a, 12b, 12c, and 12d and support bearings 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h held by arms 15a, 15b, 15c, and 15d also do not shift axially and remain in their original positions, just like arms 15a, 15b, 15c, and 15d.

[0046] According to this structure, the bearings 22a and 22b built into the intermediate roll bearings 4a, 4b, 4c, and 4d can have a normal inner race structure. The inner races of the bearings 22a and 22b rotate only about their axes at the neck shafts of the intermediate rolls 3a and 3b, eliminating the need for axial sliding. Therefore, the surfaces of the neck shafts of the intermediate rolls 3a and 3b can have a normal hardness, eliminating the need for special heat treatment and shrink-fitting of inner races with high hardness surfaces. Therefore, even if the overall length of the intermediate rolls increases in response to the recent demand for increased strip widths, this special treatment is no longer necessary, thereby minimizing the associated cost increase and eliminating manufacturing difficulties. As a result, the rolling mill 100 of the present invention is more suitable than conventional rolling mills for producing high-quality strips with high productivity, especially for hard materials.

[0047] For comparison, a conventional structural example is shown in Fig. 3. Fig. 3 shows only the intermediate roll 103a on the vertically upper side of the strip 1, but the structure of the intermediate roll on the vertically lower side is the same, so details are omitted.

[0048] 3, intermediate roll bearings 104a and 104b are attached to the roll neck of the intermediate roll 103a via bearings 38a and 38b. The intermediate roll 103a is movable in the axial direction via hooks 39a and 39b attached to another bearing housing 29a via a thrust bearing 28a on the drive side, shift frame hooks 25a and 25b, and the shift block 24, using shift frames 23a and 23b as guides by shift cylinders 26a and 26b.

[0049] In the case of this conventional structure, when the intermediate roll 3a shifts axially by δ, only the intermediate roll 103a shifts axially, because the support rolls 12a, 12b and the arms 115a, 115b to which they are fixed are fixed axially to the intermediate roll bearings 104a, 104b via the support shafts 116a, 116b.

[0050] In this case, since a normal inner race structure cannot be applied to the bearings 38a, 38b built into the intermediate roll bearings 104a, 104b, the rollers of the bearings 38a, 38b and the neck shaft portions 40a, 40b of the intermediate roll 103a had to bear the rotation about the axis during driving and the sliding in the axial direction during shifting.

[0051] For this reason, the surfaces of the neck shaft portions 40a, 40b of the intermediate rolls 3a, 3b must have extremely high hardness, and this has been achieved by either directly heat treating the surfaces of the neck shaft portions 40a, 40b of the intermediate rolls 3a, 3b to ensure high hardness, or by shrink-fitting inner races with high surface hardness.

[0052] However, with the recent need for an increase in the width of the strip, the overall length of the intermediate rolls 3a and 3b has also been increasing, which has led to increased difficulties in manufacturing the rolls due to special requirements, which has resulted in a corresponding increase in costs and in some cases has made manufacturing difficult.

[0053] In contrast to this, in the rolling mill 100 of the first embodiment of the present invention described above, when each of the intermediate rolls 3a, 3b is shifted in the roll axis direction, the intermediate rolls 3a, 3b are shifted in the roll axis direction together with the intermediate roll bearings 4a, 4b, 4c, 4d and the connecting shafts 16a, 16b, 16c, 16d, and the arms 15a, 15b, 15c, 15d slide on the connecting shafts 16a, 16b, 16c, 16d and remain without shifting in the axial direction, so these problems do not occur.

[0054] Furthermore, the length of the connecting shafts 16a, 16b, 16c, and 16d in the roll axis direction is longer than the length of the arms 15a, 15b, and 15c in the roll axis direction by the amount of shift of the intermediate rolls 3a and 3b. Therefore, with a simple structure, when the intermediate rolls 3a and 3b shift in the roll axis direction, the arms 15a, 15b, 15c, and 15d can be slid on the connecting shafts 16a, 16b, 16c, and 16d, and can be held in place without shifting in the axial direction.

[0055] Furthermore, by further providing sliding liners 41a, 41b, 41c, 41d arranged between the arms 15a, 15b, 15c, 15d and the connecting shafts 16a, 16b, 16c, 16d, it is possible to reduce the influence of wear due to friction between the arms 15a, 15b, 15c, 15d and the connecting shafts 16a, 16b, 16c, 16d when the intermediate rolls 3a, 3b are shifted in the roll axis direction, thereby making it possible to achieve specifications that can withstand long-term use.

[0056] Furthermore, by further providing stoppers 21a, 21b, 21c, 21d that are provided on the side blocks 17a, 17b, 17c, 17d and that prevent the intermediate rolls 3a, 3b of the arms 15a, 15b, 15c, 15d from moving in the axial direction, it is possible to more reliably prevent the arms 15a, 15b, 15c, 15d from shifting.

[0057] <Second Example> A rolling mill according to a second embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 6 is a front view of an eight-high rolling mill according to the second embodiment, and Figure 7 is a cross-sectional view taken along the line DD in Figure 6.

[0058] The rolling mill 100A of the second embodiment shown in FIGS. 6 and 7 is also an eight-high rolling mill, and a strip 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2a, 2b.

[0059] This pair of upper and lower work rolls 2a, 2b is supported in contact with a pair of upper and lower intermediate rolls 3a, 3b, which in turn are supported in contact with a pair of upper and lower second intermediate rolls 31a, 31b. That is, in this embodiment, the intermediate roll group is made up of a pair of upper and lower intermediate rolls 3a, 3b (first intermediate rolls) that support the work rolls 2a, 2b, and a pair of upper and lower second intermediate rolls 31a, 31b that support the intermediate rolls 3a, 3b.

[0060] Furthermore, the pair of upper and lower second intermediate rolls 31a, 31b are supported in contact with the pair of upper and lower backup rolls 5a, 5b, respectively.

[0061] The structure around the work rolls 2a, 2b, intermediate rolls 3a, 3b, and backup rolls 5a, 5b is the same as that of the rolling mill 100 of the first embodiment, and details thereof will be omitted.

[0062] The pair of upper and lower second intermediate rolls 31a, 31b are positioned point-symmetrically in the opposite strip width direction to the intermediate rolls 3a, 3b, and have tapered roll shoulders 31c, 31d at the roll body end positions in a point-symmetrical direction above and below the strip width center of the strip 1.

[0063] In addition, second intermediate roll bearings 32a and 32b are attached to the roll neck portion of the second intermediate roll 31a via bearings that are omitted for convenience of illustration, and second intermediate roll bearings 32c and 32d are attached to the roll neck portion of the second intermediate roll 31b via bearings that are omitted for convenience of illustration.

[0064] The second intermediate roll 31a is movable in the axial direction via a bearing that houses the second intermediate roll bearing 32b on the drive side, by a shift cylinder that is omitted for convenience of illustration, and the second intermediate roll 31b is movable in the axial direction via a bearing housing that houses the second intermediate roll bearing 32d on the drive side, by a shift cylinder that is omitted for convenience of illustration.

[0065] The second intermediate roll bearings 32a, 32b, 32c, and 32d are respectively equipped with bending cylinders 33a, 33b, 33c, and 33d that impart roll bending to the second intermediate rolls 31a and 31b. The shifting of the tapered roll shoulders 31c and 31d of the second intermediate rolls 31a and 31b and the roll bending further improve the strip shape quality.

[0066] However, the tapered roll shoulders 31c, 31d of the second intermediate rolls 31a, 31b and the shift thereof are not essential, and may be omitted in some cases.

[0067] The other configurations and operations are substantially the same as those of the rolling mill 100 of the first embodiment described above, and details thereof will be omitted.

[0068] That is, when the intermediate rolls 3a, 3b and the second intermediate rolls 31a, 31b are shifted in the roll axis direction, the intermediate rolls 3a, 3b and the second intermediate rolls 31a, 31b are shifted in the roll axis direction together with the intermediate roll bearings 4a, 4b, 4c, 4d, the second intermediate roll bearings 32a, 32b, 32c, 32d and the connecting shafts 16a, 16b, 16c, 16d, and the arms 15a, 15b, 15c, 15d are shifted in the axial direction by sliding on the connecting shafts 16a, 16b, 16c, 16d. The rolling mill 100 of the first embodiment is the same as the rolling mill 100 of the first embodiment in that the length of the connecting shafts 16a, 16b, 16c, 16d in the roll axis direction can be made longer than the length of the arms 15a, 15b, 15c, 15d in the roll axis direction by the amount of shift of the intermediate rolls 3a, 3b and the second intermediate rolls 31a, 31b, that sliding liners 41a, 41b, 41c, 41d can be further provided, and that stoppers 21a, 21b, 21c, 21d can be further provided.

[0069] In the rolling mill 100A according to the second embodiment of the present invention, substantially the same effects as those of the rolling mill 100 according to the first embodiment described above can be obtained.

[0070] <Third Example> A rolling mill according to a third embodiment of the present invention will be described with reference to Figures 8 to 10. Figure 8 is a front view of a six-high rolling mill according to the third embodiment, Figure 9 is a cross-sectional view taken along the line EE in Figure 8, and Figure 10 is a cross-sectional view taken along the line FF in Figure 8.

[0071] The rolling mill 100B of this embodiment shown in Figures 8 to 10 is a six-high rolling mill, as shown in Figures 8 and 9, and a strip 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2a, 2b.

[0072] The work roll 2a is rotatably supported by support bearings 34a and 34b installed on the operating side and drive side at the outlet side of the strip 1, and is rotatably supported by support bearings 34c and 34d installed on the operating side and drive side at the inlet side of the strip 1. These support bearings 34a and 34b are rotatably supported by an arm 36a via shafts 35a and 35b, respectively, and the support bearings 34c and 34d are rotatably held by an arm 36b via shafts 35c and 35d, respectively.

[0073] Similarly, the work roll 2b is rotatably supported by support bearings 34e and 34f installed on the operating side and driving side at the outlet side of the strip 1, and is rotatably held by support bearings 34g and 34h installed on the operating side and driving side at the inlet side of the strip 1.

[0074] The arm 36a is connected to the intermediate roll bearings 4a, 4b on the operation side and drive side of the intermediate roll 3a via a connecting shaft 37a so as to be swingable and slidable in the axial direction, and the arm 36b is connected to the intermediate roll bearings 4a, 4b on the operation side and drive side of the intermediate roll 3a via a connecting shaft 37b so as to be swingable and slidable in the axial direction.

[0075] Similarly, the arm 36c is connected to the intermediate roll bearings 4c and 4d on the operation side and drive side of the intermediate roll 3b via a connecting shaft 37c so as to be swingable and slidable in the axial direction, and the arm 36d is connected to the intermediate roll bearings 4c and 4d on the operation side and drive side of the intermediate roll 3b via a connecting shaft 37d so as to be swingable and slidable in the axial direction.

[0076] The positions of the arms 36a, 36b, 36c, and 36d in the path direction are adjusted and supported by side blocks 17a, 17b, 17c, and 17d, respectively, whose positions in the path direction are adjustable.

[0077] In the rolling mill 100B of this embodiment, when the intermediate rolls 3a, 3b are axially shifted δ, the intermediate rolls 3a, 3b are shifted in the roll axial direction together with the intermediate roll bearings 4a, 4b, 4c, 4d and connecting shafts 37a, 37b, 37c, 37d, but the arms 36a, 36b, 36c, 36d slide on the connecting shafts 37a, 37b, 37c, 37d and remain without shifting in the axial direction. Similarly, the support bearings 34a, 34b, 34c, 34d, 34e, 34f, 34g, 34h do not shift in the axial direction and remain in their original positions because the arms 36a, 36b, 36c, 36d slide on the connecting shafts 37a, 37b, 37c, 37d.

[0078] The other configurations and operations are substantially the same as those of the rolling mill 100 of the first embodiment described above, and details thereof will be omitted.

[0079] That is, as with the rolling mill 100 of the first embodiment, when each of the intermediate rolls 3a, 3b shifts in the roll axis direction, the intermediate rolls 3a, 3b shift in the roll axis direction together with the intermediate roll bearings 4a, 4b, 4c, 4d and connecting shafts 37a, 37b, 37c, 37d, while the arms 36a, 36b, 36c, 36d slide on the connecting shafts 37a, 37b, 37c, 37d and do not shift in the axial direction; the length of the connecting shafts 37a, 37b, 37c, 37d in the roll axis direction can be longer than the length of the arms 36a, 36b, 36c, 36d in the roll axis direction by the shift amount of the intermediate rolls 3a, 3b; sliding liners 41a, 41b, 41c, 41d; and stoppers 21a, 21b, 21c, 21d can be further provided.

[0080] In the rolling mill 100B according to the third embodiment of the present invention, substantially the same effects as those of the rolling mill 100 according to the first embodiment described above can be obtained.

[0081] Furthermore, in the rolling mill 100B of this embodiment, the support bearings 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h are installed on the operating side and drive side of the work rolls 2a and 2b, so there is no concern that marks from the support bearings 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h will be transferred to the strip 1.

[0082] In addition, even in an eight-high rolling mill such as the rolling mill 100A of the second embodiment, in which the intermediate roll group is composed of intermediate rolls 3a, 3b and second intermediate rolls 31a, 31b, it is possible to configure the rolling mill as in the rolling mill 100B of the present embodiment, with support bearings 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h that support the work rolls 2a, 2b on the entry side and / or exit side of the work rolls 2a, 2b.

[0083] <Other> It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications. The above-described embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to an embodiment having all of the described configurations.

[0084] It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment, or to add, delete, or replace part of the configuration of each embodiment with the configuration of another embodiment. [Explanation of symbols]

[0085] 1; Strip 2a, 2b: Work rolls 3a, 3b: Intermediate roll 3c, 3d; Roll shoulder 4a, 4b, 4c, 4d: Intermediate roll bearings 5a, 5b; Reinforcement roll 6a, 6b, 6c, 6d: Reinforcement roll bearing box 7a, 7b: Pass line adjustment device 8a, 8b: Pressure hydraulic cylinder 9a, 9b; Housing 10a, 10b; Thrust bearing 11a,11b;axis 12a, 12b, 12c, 12d; Support rolls (support roll group) 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h; Support bearings (support roll group) 14a,14b,14c,14d,14e,14f,14g,14h;axis 15a, 15b, 15c, 15d; Arms 16a,16b,16c,16d;Connection shaft 17a, 17b, 17c, 17d; Side blocks 18a, 18b, 18c, 18d, 18e, 18f, 18g, 18h, 19a, 19b, 19c, 19d, 19e, 19f, 19g, 19h; Tapered Wedge 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h; Hydraulic cylinder 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h; Stopper 22a, 22b; bearings 23a, 23b; Shift frame 24; Shift block 25a, 25b; Shift frame hook 26a, 26b; Shift cylinder 27a, 27b; Hook 28a; Thrust bearing 29a; Bearing box 30a, 30b, 30c, 30d; bending cylinder 31a, 31b: Second intermediate roll 31c, 31d; Roll shoulder 32a, 32b, 32c, 32d: Second intermediate roll bearing 33a, 33b, 33c, 33d; bending cylinder 34a, 34b, 34c, 34d, 34e, 34f, 34g, 34h; support bearings 35a,35b,35c,35d;axis 36a, 36b, 36c, 36d; Arms 37a,37b,37c,37d;Connection shaft 38a, 38b; bearings 39a, 39b; Hook 40a, 40b: neck shaft 41a, 41b, 41c, 41d; sliding liner 100, 100A, 100B; Rolling mill

Claims

1. a pair of work rolls for rolling the strip; a pair of intermediate rolls supporting the work rolls; a pair of backup rolls supporting the intermediate roll group; a shift device that independently shifts each of the intermediate roll groups in the roll axis direction; a support roll group or a support bearing that supports the work roll on the entry side and / or the exit side of the work roll, The support rolls or support bearings are held by arms, the arm is connected to intermediate roll bearings on the operation side and the drive side of each intermediate roll of the intermediate roll group via a connecting shaft so as to be swingable and axially slidable; The position of the arm in the path direction is adjusted and supported by a side block whose position in the path direction is adjustable, When each of the intermediate rolls shifts in the roll axis direction, the intermediate roll is shifted in the roll axis direction together with the intermediate roll bearing and the connecting shaft, The arm slides on the connecting shaft and remains without shifting in the axial direction. Rolling mill.

2. 2. The rolling mill according to claim 1, The length of the connecting shaft in the roll axis direction is longer than the length of the arm in the roll axis direction by the shift amount of the intermediate roll. Rolling mill.

3. 2. The rolling mill according to claim 1, a sliding liner disposed between the arm and the connecting shaft; Rolling mill.

4. 2. The rolling mill according to claim 1, The side block further includes a stopper for preventing the arm from moving in the axial direction of the intermediate roll. Rolling mill.

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