Rolling machine

Abstract

A rolling machine (1) comprises: a work roll (10) that contacts a rolling material (K); a backup roll (20) that supports the work roll (10); a housing (30) that houses the work roll (10) and the backup roll (20); a first bearing (40) that supports the work roll (10) with respect to the housing (30); and a second bearing (50) that supports the backup roll (20) with respect to the housing (30).

Description

rolling mill

[0001] The present disclosure relates to rolling mills.

[0002] There are known rolling mills for rolling a material to be rolled. For example, in the rolling mill disclosed in Patent Document 1, a pair of upper and lower work rolls are accommodated in work roll accommodation sections formed in a main body block held by posts, and work roll chocks are held in work roll chock accommodation sections.

[0003] Japanese Patent Application Publication No. 9-001213

[0004] This type of rolling mill comprises work rolls that come into contact with the material to be rolled, backup rolls that support the work rolls, and a housing that houses the work rolls and backup rolls. The work rolls are supported relative to the housing by bearings. The backup rolls are supported relative to the housing by bearings.

[0005] Ideally, the rolling load applied to the work rolls from the rolled material is almost entirely applied to the bearings on the backup roll side, and almost none is applied to the bearings on the work roll side. In this case, almost no deflection occurs in the work rolls.

[0006] However, in reality, due to factors such as manufacturing errors, part of the rolling load may be applied to the bearings on the work roll side. In this case, the work roll is likely to deflect. When the work roll deflects, the deflection is transferred to the material being rolled, thereby deteriorating the dimensional accuracy of the material being rolled.

[0007] The present disclosure has been made in view of the above points, and an object thereof is to suppress deflection of work rolls in a rolling mill.

[0008] The rolling mill according to the present disclosure comprises a work roll that contacts the material to be rolled, a backup roll that supports the work roll, a housing that accommodates the work roll and the backup roll, a first bearing that supports the work roll relative to the housing, and a second bearing that supports the backup roll relative to the housing, wherein the first bearing is disposed in a first hole portion provided in the housing, and the first hole portion is configured so that a first length in a first direction in which the work roll and the backup roll are aligned is longer than a second length in a second direction perpendicular to the first direction, and a gap is provided between the first bearing and the first hole portion in the first direction.

[0009] According to the present disclosure, deflection of the work rolls in a rolling mill can be suppressed.

[0010] FIG. 1 shows a perspective view of a rolling mill according to the first embodiment. FIG. 2 shows a front cross-sectional view of the rolling mill according to the first embodiment taken along line II-II. FIG. 3 shows a plan cross-sectional view of the rolling mill according to the first embodiment taken along line III-III. FIG. 4 shows a front cross-sectional view of the clearance between the first bearing and the first through hole according to the first embodiment. FIG. 5 shows a perspective view of a work roll according to the first embodiment. FIG. 6 shows a perspective view of a second support member of the housing according to the first embodiment. FIG. 7 shows a front view of a first support member of the housing according to the first embodiment. FIG. 8 shows the derivation of the clearance according to the first embodiment. FIG. 9 is a view corresponding to FIG. 7 but relating to a second embodiment.

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses.

[0012] <First embodiment> (Rolling mill) A rolling mill 1 according to the first embodiment will be described. FIG. 1 shows the rolling mill 1 in a perspective view. FIG. 2 shows the rolling mill 1 in a front cross-sectional view taken along line II-II. FIG. 3 shows the rolling mill 1 in a plan cross-sectional view taken along line III-III. FIG. 4 shows the gap C between a first bearing 40 (described later) and a first through hole 33a (described later) in a front cross-sectional view. FIG. 5 shows a work roll 10 (described later) in a perspective view. FIG. 6 shows a second support member 34 of a housing 30 (described later) in a perspective view. FIG. 7 shows a first support member 33 of a housing 30 (described later) in a front view.

[0013] 1, the X direction is the first direction or front-rear direction, the Y direction is the left-right direction, and the Z direction is the second direction or up-down direction. The front-rear direction (first direction), the left-right direction, and the up-down direction (second direction) are perpendicular to each other.

[0014] The side of the rolled material K, which will be described later, in the front-to-rear direction (first direction) is referred to as the inner side in the front-to-rear direction, and the side opposite the rolled material K in the front-to-rear direction is referred to as the outer side in the front-to-rear direction. In the left-to-right direction, the side of the body 11 in the axial direction of the work roll 10, which will be described later, is referred to as the inner side in the left-to-right direction, and the side of the shaft 12 in the axial direction of the work roll 10, which will be described later, is referred to as the outer side in the left-to-right direction.

[0015] The rolling mill 1 rolls a material K to be rolled. The material K is made of, for example, metal, resin, or powder. In this example, the material K is in the form of a plate. The material K is transported in the vertical direction by a transport mechanism, and passes through the rolling mill 1 along the way. In this example, the rolling mill 1 is a four-high rolling mill.

[0016] As shown in FIGS. 1 to 3, the rolling mill 1 includes a work roll 10, a backup roll 20, a housing 30, a first bearing 40, a second bearing 50, and a sleeve 60.

[0017] As shown in Figures 1 to 3, there are a pair (two) of work rolls 10. The axial direction (axial center) of the work rolls 10 extends in the left-right direction. The work rolls 10 are arranged side by side in the front-to-rear direction (first direction). The work roll 10 has a body portion 11 and two shaft portions 12.

[0018] The barrel portion 11 constitutes the middle portion of the work roll 10 in the axial direction. The shank portion 12 constitutes both end portions of the work roll 10 in the axial direction. The outer diameter of the barrel portion 11 is larger than the outer diameter of the shank portion 12. A gap is provided between the outer peripheral surfaces of the barrel portions 11 of each work roll 10 to allow the material K to pass through. The barrel portion 11 of the work roll 10 comes into contact with the material K to be rolled.

[0019] As shown in Figures 1 to 3, there are a pair (two) of backup rolls 20. The axial direction (axial center) of the backup roll 20 extends in the left-right direction. The work roll 10 and the backup roll 20 are aligned in the front-to-rear direction (first direction, X direction). The backup roll 20 is arranged on the outer side of the work roll 10 in the front-to-rear direction (opposite the rolled material K). The backup roll 20 has a body portion 21 and two shaft portions 22.

[0020] The body portion 21 constitutes the middle portion of the backup roll 20 in the axial direction. The shank portion 22 constitutes both end portions of the backup roll 20 in the axial direction. The outer diameter of the body portion 21 is larger than the outer diameter of the shank portion 22. The body portion 21 of the backup roll 20 contacts the body portion 11 of the work roll 10. The body portion 21 of the backup roll 20 supports the body portion 11 of the work roll 10. The body portion 21 of the backup roll 20 presses the body portion 11 of the work roll 10 inward in the front-to-rear direction (towards the rolled material K).

[0021] 1 to 3, the housing 30 accommodates the work rolls 10 and the backup rolls 20. The housing 30 is generally box-shaped. The housing 30 has a sole plate 31, an upper plate 32, a first support member 33, and a second support member 34. The sole plate 31, the upper plate 32, the first support member 33, and the second support member 34 are configured as separate members and can be separated from one another.

[0022] 1 and 2 , the sole plate 31 is plate-shaped. A through hole 31 a is formed in the sole plate 31. The sole plate 31 is placed on a reference surface such as a table. The upper plate 32 is plate-shaped. A through hole 32 a is formed in the upper plate 32. The upper plate 32 is disposed above the sole plate 31. The work roll 10 and the backup roll 20 are disposed between the sole plate 31 and the upper plate 32.

[0023] The material K to be rolled passes from top to bottom through the through hole 32a of the upper plate 32, is rolled as it passes through the gap between each work roll 10, and is sent downward through the through hole 31a of the sole plate 31.

[0024] 1, 3, and 4, there are two second support members 34. The second support members 34 are disposed between the sole plate 31 and the upper plate 32. The second support members 34 connect the sole plate 31 and the upper plate 32 to each other in the up-down direction.

[0025] As shown in Figure 6, the second support member 34 is formed in a generally U-shape that is open inward in the front-rear direction when viewed in the up-down direction. The second support member 34 includes a vertical extension portion 34a and a horizontal extension portion 34b. The vertical extension portion 34a is plate-shaped and extends in the up-down and left-right directions. The vertical extension portion 34a is disposed outside the backup roll 20 in the front-rear direction.

[0026] There are two laterally extending portions 34b. The laterally extending portions 34b are plate-shaped and extend in the up-down and front-rear directions. The laterally extending portions 34b are arranged inside the vertically extending portions 34a in the front-rear direction. The laterally extending portions 34b protrude inward in the front-rear direction from the vertically extending portions 34a. The laterally extending portions 34b are arranged outside the backup roll 20 in the left-right direction (axial direction).

[0027] A second through hole 34c serving as a second hole portion is provided in the laterally extending portion 34b of the second support member 34. The second through hole 34c penetrates the laterally extending portion 34b of the second support member 34 in the left-right direction (axial direction). The second through hole 34c corresponds to the backup roll 20. The cross-sectional shape of the second through hole 34c is a substantially perfect circle.

[0028] As shown in FIG. 4 , the second bearing 50 supports the shaft portion 22 of the backup roll 20 relative to the housing 30. Two second bearings 50 are used for each backup roll 20. In this example, the second bearing 50 is a rolling bearing. The cross-sectional shape of the second bearing 50 is substantially circular. The inner ring of the second bearing 50 is fitted onto the shaft portion 22 of the backup roll 20. The outer ring of the second bearing 50 is fitted into the second through hole 34c of the second support member 34 of the housing 30. The second bearing 50 is prevented from coming loose in the axial direction (left-right direction) by a protrusion 34d provided on the inner periphery of the second through hole 34c.

[0029] A notch 34e is provided at the tip end (the inner end in the front-rear direction) of the horizontal extension portion 34b of the second support member 34. The notch 34e is provided to suppress interference with the work roll 10 (see FIG. 4).

[0030] As shown in Fig. 3, there are four first support members 33. As shown in Fig. 7, the first support members 33 are plate-shaped and extend in the up-down and front-rear directions. The first support members 33 are disposed outward in the left-right direction (axial direction) relative to the second support members 34. The first support members 33 are disposed offset inward in the front-rear direction relative to the second support members 34. The first support members 33 are disposed outward in the left-right direction (axial direction) relative to the work rolls 10 and the backup rolls 20.

[0031] 4 and 7 , the first support member 33 of the housing 30 is provided with a first through-hole 33a and a through-hole 33b as first hole portions. The first through-hole 33a penetrates the first support member 33 in the left-right direction (axial direction). The through-hole 33b penetrates the first support member 33 in the left-right direction (axial direction). The first through-hole 33a is located inside the through-hole 33b in the front-rear direction. As will be described later, the first through-hole 33a corresponds to the work roll 10. The through-hole 33b corresponds to the backup roll 20 and allows the shaft portion 22 of the backup roll 20 to pass through.

[0032] As shown in Figure 4, the first bearing 40 supports the shaft portion 12 of the work roll 10 relative to the housing 30. Two first bearings 40 are used for each work roll 10. In this example, the first bearings 40 are rolling bearings. The cross-sectional shape of the first bearings 40 is a substantially perfect circle. As shown in Figure 5, the inner ring of the first bearing 40 is fitted onto the shaft portion 12 of the work roll 10.

[0033] The outer ring of the first bearing 40 is fitted onto the inner periphery of a cylindrical sleeve 60. Two sleeves 60 are used for each work roll 10. The cross-sectional shape of the sleeve 60 is approximately circular. When the first bearing 40 is fitted into the sleeve 60, the outer periphery of the sleeve 60 is fitted into the first through hole 33a of the first support member 33 of the housing 30. In other words, the first bearing 40 is fitted into the first through hole 33a via the sleeve 60. The sleeve 60 is interposed between the first bearing 40 and the first through hole 33a. A protrusion 33g provided on the inner periphery of the first through hole 33a prevents the sleeve 60 (first bearing 40) from slipping out in the axial direction (left-right direction).

[0034] As shown in Figure 7, the first through hole 33a is configured so that its first length in the front-to-rear direction (first direction, X direction) as a front-to-rear length Hx is longer than its second length in the up-down direction (second direction, Z direction) perpendicular to the front-to-rear direction as a top-to-bottom length Hz.

[0035] The first through hole 33 a has a flat shape that is long in the front-rear direction (first direction) and short in the up-down direction (second direction). The cross-sectional shape of the first through hole 33 a is an ellipse or oval shape with a major axis in the front-rear direction (first direction) and a minor axis in the up-down direction (second direction).

[0036] 4, a gap C is provided between the first bearing 40 and the first through hole 33a in the front-rear direction (first direction). More precisely, a gap C is provided between the sleeve 60 in which the first bearing 40 is fitted and the first through hole 33a in the front-rear direction (first direction). More specifically, a gap C is provided between the outer periphery of the sleeve 60 and the inner periphery of the first through hole 33a in the front-rear direction (first direction).

[0037] The gap C in the front-to-rear direction (the sum of the gaps on both sides in the front-to-rear direction) is preferably 1 mm or more.

[0038] The gap between the sleeve 60 (first bearing 40) and the first through hole 33a in the vertical direction (second direction) is preferably as small as possible, and is preferably zero.

[0039] (Derivation of Gap) The minimum necessary gap C is derived as follows. Fig. 8 shows the derivation of the gap C. It is preferable that the gap C is equal to or greater than the sum of the deformation δ12 of the backup roll 20, the deformation δ3 of the second bearing 50, and the distance δ4 between the work roll 10 and the backup roll 20 (C ≥ δ12 + δ3 + δ4).

[0040] The deformation amount δ12 of the backup roll 20 is caused by the rolling load from the rolled material K on the work roll 10. The rolling load from the rolled material K acts on the backup roll 20 via the work roll 10. The rolling load acting on the backup roll 20 is then supported by the two second bearings 50.

[0041] The deformation amount δ12 of the backup roll 20 is the sum (δ12=δ1+δ2) of the maximum deflection amount δ1 due to bending and the maximum deflection amount δ2 due to shearing.

[0042] The maximum deflection δ1 [mm] due to bending is ２ y / dx２ =-M / E Ｂ I can be transformed into the following equation: M is the bending moment [N mm], E Ｂ is the modulus of longitudinal elasticity (Young's modulus) of the backup roll 20 [N / mm ２ ], I is the second moment of area [mm ４ ].

[0043] In the formula [1], the total length of the backup roll 20 (more precisely, the distance between the two second bearings 50) L [mm], the outer diameter D of the barrel 21 of the backup roll 20 Ｂ [mm], outer diameter d of the shaft portion 22 of the backup roll 20 Ｂ [mm], the distance n [mm] from the end of the barrel 21 of the backup roll 20 to the support position by the second bearing 50, and the Young's modulus E of the backup roll 20. Ｂ [N / mm ２ ], rolling load per unit length W [N / mm], working range b [mm] of the rolling load W, and the circular constant π were used. The maximum deflection δ1 due to bending occurs at the center position (L / 2) of the backup roll 20.

[0044]

[0045] The maximum deflection amount δ2 due to shear is τ = γG Ｂ is deformed to obtain the transverse elastic modulus (shear elastic modulus) G Ｂ [N / mm ２ ] is expressed by the formula [Equation 2], where τ is the shear stress [N / mm ２ ], γ is the shear strain [-].

[0046]

[0047] 8 shows the load A supported by each of the two second bearings 50 on the backup roll 20 side relative to the rolling load Wb. Each second bearing 50 supports approximately half of the rolling load Wb (W×b). In other words, the load A supported by the second bearing 50 is half of the rolling load Wb (A=Wb / 2).

[0048] The deformation amount δ3 [mm] of the second bearing 50 is generated by the support load A. The deformation amount δ3 of the second bearing 50 varies depending on the type of bearing. For example, when a roller bearing (model number 22212RZ) manufactured by JTEKT Corporation is used as the second bearing 50, the deformation amount δ3 of the second bearing 50 is expressed by the following formula [Formula 3]. In formula [Formula 3], α is the nominal contact angle [°], L ｗｒ Roller effective contact length [mm], Q ＭＡＸ is the maximum rolling element load [N].

[0049]

[0050] The distance δ4 [mm] between the work roll 10 and the backup roll 20 is expressed by the formula [4]. The formula [4] uses the Hertz theory of contact stress. In the formula [4], the outer diameter D of the barrel 11 of the work roll 10 is Ｗ [mm] (see FIG. 5), the Young's modulus E of the work roll 10 Ｗ [N / mm ２ ], Poisson's ratio ν of the work roll 10 Ｗ [-], outer diameter D of the barrel 21 of the backup roll Ｂ [mm], the longitudinal elastic modulus (Young's modulus) E of the backup roll 20 Ｂ [N / mm ２ ], Poisson's ratio ν of the backup roll 20 Ｂ [-], rolling load per unit length W [N / mm], pi, Napier's constant e, and natural logarithm ln with base e were used.

[0051]

[0052] The required gap C can be calculated using equations [Formula 1] to [Formula 4] (C≧δ12+δ3+δ4=δ1+δ2+δ3+δ4).

[0053] The material of the work roll 10 and the backup roll 20 is SKD11. L = 430 [mm] (L / 2 = 215 [mm]), D Ｂ =200 [mm], d Ｂ = 60 [mm], n = 85 [mm], b = 100 [mm], D Ｗ = 60 [mm]. The rolling load Wb is set to 5000 [kgf] (49000 [N]).

[0054] In this case, δ1 + δ2 + δ3 + δ4 = approximately 0.12 mm. Therefore, it is sufficient to ensure that the gap C is 0.12 mm or more. It is preferable to ensure that the gap C is 1 mm or more to have some leeway. Furthermore, from the perspective of the rigidity of the first support member 33, it is preferable that the gap C is 5 mm or less.

[0055] (Function and Effect) As shown in Figure 3, the rolling load Wb applied to the work roll 10 from the material to be rolled K is ideally applied almost entirely to the second bearing 50 on the backup roll 20 side, and almost none is applied to the first bearing 40 on the work roll 10 side. At this time, each of the two second bearings 50 on the backup roll 20 side supports approximately half of the rolling load Wb. The support load A for the rolling load Wb by each second bearing 50 on the backup roll 20 side is 1 / 2 of the rolling load Wb (A = Wb / 2). The rolling load Wb acts in the front-to-rear direction (first direction).

[0056] Ideally, almost no rolling load Wb is applied to the first bearings 40 on the work roll 10 side, so the support load A' against the rolling load Wb by each of the two first bearings 40 on the work roll 10 side is zero (A' = 0). In this case, almost no deflection occurs in the work roll 10.

[0057] However, in reality, due to factors such as manufacturing errors, part of the rolling load Wb may be applied to the first bearing 40 on the work roll 10 side (A'>0). In this case, the work roll 10 is likely to bend. When the work roll 10 is bent, the bend is transferred to the material K to be rolled, thereby deteriorating the dimensional accuracy of the material K to be rolled.

[0058] In this embodiment, the first through hole 33a is configured so that its longitudinal length Hx in the front-rear direction (first direction, X direction) is longer than its vertical length Hz in the up-down direction (second direction, Z direction). A gap C (play) is provided between the first bearing 40 and the first through hole 33a in the front-rear direction (first direction), which is the direction in which the rolling load Wb acts.

[0059] Even if part of the rolling load Wb is applied to the first bearing 40 on the work roll 10 side, the first bearing 40, sleeve 60, and work roll 10 move (rotational movement or sliding translational movement) together in the forward and backward directions (first direction) relative to the first through hole 33a, following the deflection of the backup roll 20.

[0060] This allows the rolling load Wb applied to the first bearing 40 on the work roll 10 side to be released. The support load A' against the rolling load Wb by the first bearing 40 on the work roll 10 side can be made almost zero (A' = 0). This makes it possible to suppress deflection of the work roll 10 in the rolling mill 1. This prevents the deflection of the work roll 10 from being transferred to the material K to be rolled. This prevents a deterioration in the dimensional accuracy of the material K to be rolled. Furthermore, it is possible to prevent the work roll 10 from breaking due to bending stress.

[0061] By regarding the support load A' against the rolling load Wb by the first bearing 40 on the work roll 10 side as zero, control of the rolling mill 1 becomes simple.

[0062] Since the first bearing 40 is fitted into the first through hole 33a via the sleeve 60, wear of the first bearing 40 when it moves relative to the first through hole 33a can be suppressed compared to when the first bearing 40 is fitted directly into the first through hole 33a.

[0063] By making the cross-sectional shape of the first through hole 33a an ellipse or oval shape having a major axis in the front-to-back direction (first direction), it is possible to more easily create a gap C between the first bearing 40 (sleeve 60) and the first through hole 33a in the front-to-back direction (first direction).

[0064] In the housing 30, by separating the first support member 33 on the work roll 10 side and the second support member 34 on the backup roll 20 side, the work roll 10 and / or the backup roll 20 can be easily attached and detached, resulting in excellent maintainability.

[0065] The clearance C is equal to or greater than the sum of the deformation δ12 of the backup roll 20 (maximum deflection due to bending δ1 and maximum deflection due to shear δ2), the deformation δ3 of the second bearing 50, and the distance δ4 between the work roll 10 and the backup roll 20 (C≧δ1+δ2+δ3+δ4). This is advantageous in reducing the support load A' for the rolling load Wb by the first bearing 40 on the work roll 10 side to zero (A'=0). This is also advantageous in suppressing deflection of the work roll 10.

[0066] By making the gap C 1 mm or more, the gap C necessary to suppress deflection of the work roll 10 can be secured with a margin.

[0067] Second Embodiment A rolling mill 1 according to a second embodiment will be described with reference to Fig. 9. Fig. 9 is a view corresponding to Fig. 7 according to the second embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0068] 9 , in this embodiment, the first support member 33 includes a first portion 33 c and a second portion 33 d. The first portion 33 c and the second portion 33 d can be separated from each other in the front-rear direction (first direction) at the first through-hole 33 a. The first portion 33 c and the second portion 33 d are separate members.

[0069] The first portion 33c is disposed inside the second portion 33d in the front-rear direction (first direction). A substantially semi-elliptical first cutout 33e is formed on the outer side of the first portion 33c in the front-rear direction. The first cutout 33e constitutes the inner half of the first through-hole 33a in the front-rear direction.

[0070] The second portion 33d is disposed outward in the front-to-rear direction (first direction) relative to the first portion 33c. A substantially semi-elliptical second cutout 33f is formed on the inner side of the second portion 33d in the front-to-rear direction. The second portion 33d also has a through-hole 33b. The second cutout 33f constitutes the outer half of the first through-hole 33a in the front-to-rear direction.

[0071] The first support member 33 is formed by connecting the first portion 33c and the second portion 33d in the front-rear direction (first direction). The first notch 33e and the second notch 33f are aligned with each other to form the first through-hole 33a by connecting the first portion 33c and the second portion 33d in the front-rear direction. The first portion 33c and the second portion 33d are connected by fastening members such as bolts and nuts.

[0072] The other configurations are the same as those of the first embodiment.

[0073] According to this embodiment, by dividing the first support member 33 into a first part 33c and a second part 33d at the first through hole 33a, the first bearing 40 (sleeve 60) can be easily attached and detached, resulting in excellent maintainability.

[0074] Other Embodiments The present disclosure has been described above with reference to preferred embodiments, but these descriptions are not limiting and various modifications are possible.

[0075] The first bearing 40 does not have to be a rolling bearing, and may be, for example, a plain bearing, etc. The same applies to the second bearing 50.

[0076] The gap C may be 1 mm or less. The gap C may be 5 mm or more.

[0077] In the housing 30, the first support member 33 and the second support member 34 do not have to be separate members, but may be formed integrally with each other.

[0078] The cross-sectional shape of the first through hole 33 a does not have to be elliptical or oval, and may be, for example, a polygonal shape such as a rectangle, a free-form curve, etc. The same applies to the outer peripheral shape of the outer ring of the first bearing 40 and the outer peripheral shape of the sleeve 60.

[0079] The first bearing 40 may be fitted directly into the first through hole 33 a without the sleeve 60 .

[0080] The first hole 33a does not have to be a through hole, but may be, for example, a hole with a bottom (i.e., a recess), etc. The same applies to the second hole 34c.

[0081] The rolling mill 1 may be provided with a pressure mechanism that presses the backup roll 20 against the work roll 10, a work roll bending mechanism that presses the work roll 10 in the direction opposite to the pressure direction, and the like.

[0082] In deriving the gap C (δ1+δ2+δ3+δ4), not only the above formula can be used but also a numerical simulation such as the finite element method can be used.

[0083] An intermediate roll may be interposed between the work roll 10 and the backup roll 20. The rolling mill 1 does not have to be a four-high rolling mill, and may be, for example, a multi-high rolling mill with another number of stages.

[0084] The feed direction of the material K to be rolled does not have to be the up-down direction, but may be, for example, the front-back direction or the left-right direction. The material K to be rolled does not have to be in a plate shape. In particular, when the material K to be rolled is made of powder, it often has a shape other than a plate shape.

[0085] The present disclosure is applicable to rolling mills and is therefore extremely useful and has high industrial applicability.

[0086] X: Front-rear direction (first direction) Y: Left-right direction Z: Up-down direction (second direction) Hx: Front-rear length (first length) Hz: Up-down length (second length) C: Gap Wb: Rolling load K: Material to be rolled 1: Rolling mill 10: Work roll 11: Body portion 12: Shaft portion 20: Backup roll 21: Body portion 22: Shaft portion 30: Housing 33: First support member 33a: First through-hole (first hole portion) 33b: Through-hole 33c: First portion 33d: Second portion 34: Second support member 34c: Second through-hole (second hole portion) 40: First bearing 50: Second bearing 60: Sleeve

Claims

1. A rolling mill comprising: a work roll in contact with a material to be rolled; a backup roll supporting the work roll; a housing accommodating the work roll and the backup roll; a first bearing supporting the work roll relative to the housing; and a second bearing supporting the backup roll relative to the housing, wherein the first bearing is disposed in a first hole portion provided in the housing, and the first hole portion is configured so that a first length in a first direction in which the work roll and the backup roll are aligned is longer than a second length in a second direction perpendicular to the first direction, and a gap is provided between the first bearing and the first hole portion in the first direction.

2. A rolling mill as claimed in claim 1, wherein the first bearing is fitted into a sleeve, the first bearing is disposed in the first hole portion via the sleeve, and a gap is provided between the sleeve in which the first bearing is fitted and the first hole portion in the first direction.

3. The rolling mill according to claim 1, wherein the cross-sectional shape of the first hole portion is rectangular, elliptical or oval.

4. The rolling mill according to claim 1, wherein the housing has a first support member and a second support member which are mutually separate members, the first support member being provided with the first hole portion, the second support member being provided with a second hole portion, and the second bearing being disposed in the second hole portion.

5. The rolling mill according to claim 1, wherein said first support member includes a first portion and a second portion separable from each other at said first hole portion.

6. A rolling mill as claimed in claim 1, wherein said gap is equal to or greater than the sum of the deformation of said backup roll, the deformation of said second bearing, and the amount of approach between said work roll and said backup roll.

7. The rolling mill according to claim 1, wherein the gap is 1 mm or more.

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