JPH02121708A - Roll for adjusting crown - Google Patents

Abstract

PURPOSE:To improve the shape and profile control effect by introducing a crown adjusting roll to at least one of backup rolls and performing rolling by a rolling mill combined with a bender. CONSTITUTION:Lubricant filling type roller bearings 21, 23 are fixed on the outside of a bush 71 slantly put on a straight arbor 1 and a bush 72 eccentrically and horizontally put on the outside of the arbor 1, respectively. Position deciding is performed by use of sloped spacers 81, 82 subjected to slope working. The inside surface of the bushes 71, 72 and the arbor 1 are fixed by use of a key, etc. The internal peripheral circle and outside peripheral circle of the bush 71 are eccentric to each other at both the ends; thickness of the other end in the extended line of the axial direction of a max. thickness part of an end is thinner than the max. thickness part. Both a flange 52 as a means bearing thrust force acting on a cylindrical sleeve 90 and a bearing 51 whose outside is fixed are fixed in an end part of the cylindrical sleeve 90. A worm wheel is keyed on the arbor 1 to engage a worm 32 and by rotating a handle 33, the arbor angle is adjustable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a crown adjustment roll used in a vertical roll arrangement type multi-stage rolling mill.

(Conventional technology) In plate rolling, the profile of the plate (thickness distribution in the width direction) is made rectangular to always produce a rolled plate with a constant thickness, and the flatness of the rolled plate is kept constant using shape control. This is an important issue, and various new rolling mills have been developed for this purpose.

To improve flatness and profile, it is necessary to prevent work roll deflection, and there are various methods such as work roll benzo ink method, bank up roll bending method, double chillack bending method, roll skew single method, roll shift method, and even Variable crown roll (hereinafter referred to as “
vcC roll) etc. have been developed.

Among these, VC rolls do not require any modifications to the rolling mill, just by changing the rolls of the existing rolling mill to VC rolls. Therefore, it can be implemented at a lower cost than other methods, and can be used in combination with an existing roll bender to improve flatness. It has also been effectively used to improve profiles.

However, the VC roll has a structure in which the sleeve is bounded by an arbor, and high pressure oil is introduced into the pressure receiving chamber in the center of the roll to inflate the sleeve. Therefore, due to the limit of sleeve stress, the maximum amount of expansion for a large roll with a diameter of about 15mm to 11ml is about 0.2 to 0.4 mm/radius.

Although it is sufficient for crown control of ordinary soft thin plates, when the plate thickness is large, the amount of crown control may be insufficient even when combined with a bender. In particular, rough rolling mills for hot rolling of aluminum, rough rolling mills for hot rolling of steel, thick plate rolling mills, etc. are required to have two to three times the current rolling capacity. In addition, even with thin plates, hard materials and special steels have high deformation resistance, so current capabilities are insufficient.

Among the other rolling mills of the above-mentioned types, some have high control capabilities, but they have problems such as enormous equipment costs and a long period of time required for modification. Therefore, it has been desired to develop a new type of roll that is simple and inexpensive, such as the VC roll, which can provide a high-performance rolling mill by changing only the roll.

A crown control system using roll eccentricity is used in Sendzimir rolling mills, different peripheral speed multi-stage rolling mills, etc. but,
All of these are multi-high rolling mills that undergo multiple rolls with a large number of rolls, and have not been put to practical use in vertical roll arrangement multi-high rolling mills (mainly 4-high rolling mills), and both require shape control during cold rolling. It is not used for technology that changes the profile for hot rolling.

For example, in the Sendzimya rolling mill, as shown in a partial cross-sectional view in FIG.
The roll crown in the longitudinal direction of the roll is adjusted by adjusting the rotational position of each eccentric ring.

In addition, in a multi-stage rolling mill with different circumferential speeds,
As shown in the figure, the tension distribution of the strip is changed by changing the tension control priddle roll 4 to an eccentric roll, changing the rotation angle of the shaft 5, and changing the envelope line crown 6 of the outer diameter from concave to convex. is taking.

Furthermore, in JP-A No. 61-7003, a mechanism is disclosed in which a plurality of split rolls are sequentially eccentrically mounted on a shaft, a thin sleeve is provided to surround the split rolls, and the roll crown is changed by adjusting the eccentric position of the split rolls. is taking.

However, since this roll has a step between the divided rolls, when used as a bank up roll for a work roll, there are likely to be parts that do not come into contact with the work roll, and the corners of the thin sleeve that constitutes the outermost ring of the back up roll tend to come into contact with the work roll. Even if the corners of the 0-divided roll are rounded, where force is concentrated and the sleeve or work roll is likely to be scratched, this problem will only be slightly alleviated, but it will not be an essential improvement. In order to reduce this, it is necessary to increase the number of divided rolls and reduce the level difference between each divided roll, which makes the mechanism complicated and maintenance difficult.

(Problems to be Solved by the Invention) An object of the present invention is to provide a crown adjustment roll that can smoothly generate a relatively large roll crown without any steps in a vertical roll arrangement type multi-stage rolling mill.

(Means for Solving the Problems) Here, the present invention includes a straight arbor, a plurality of bushings fitted and fixed to the arbor, and a plurality of rolling bearings having inner rings fitted to the bushings. , a cylindrical sleeve loosely fitted to the outer ring of the rolling bearing, means for receiving thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve, and an inclined spacer inserted into at least one gap between the bearings. At least two of the bushings have an inner circumferential circle and an outer circumferential circle that are eccentric to each other at both ends of the bushing, and the other end is on the axial extension line of the thickest part of the bushing. The crown adjustment roll is thinner than the maximum thickness portion, and is fitted in the arbor symmetrically with respect to a vertical cross section at the center of the roll.

From a further aspect, the present invention provides a straight arbor, a plurality of bushings fitted and fixed to the arbor, a plurality of rolling bearings having inner rings fitted to the bushings, and an outer ring of the rolling bearings. A roll comprising: a cylindrical sleeve loosely fitted into the cylindrical sleeve; means for receiving a thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve; and an inclined spacer inserted into at least one gap between the bearings. , the central bushing among the bushings has its inner circumferential circle and outer circumferential circle eccentric to each other, and the central axes of the inner circumferential circle and outer circumferential circle of the bushing are parallel to each other, and the other bushings have their inner circumferential circles and outer circumferential circles eccentric to each other. The circumferential circle and the outer circumferential circle are eccentric to each other at both ends of each bushing, and the other end on the axial extension line of the maximum wall thickness at one end is thinner than the thickest wall, and the vertical cross section at the center of the roll is The crown adjustment roll is fitted into the arbor symmetrically with respect to the center.

According to a preferred embodiment of the invention, a plurality of rolling bearings may be fitted into each bushing, and parallel spacers may be inserted into the bushings in the gaps between the bearings.

Further, the rolling bearing may be one in which the outer ring width is larger than the inner ring width, or a lubricant filled type bearing may be used as the rolling bearing.

As described above, in the crown adjustment roll according to the present invention, positioning is performed by the inclined spacer, and the inclination of the outer ring of the bearing installed at an angle to the arbor, that is, the roll crown, can be changed by changing the rotation angle of the arbor. Can be done.

That is, in contrast to the conventional method in which the roll crown is simply changed by eccentrically placing the bearing relative to the arbor, in the present invention, the bearing itself is tilted and a cylindrical sleeve is placed outside the bearing. A relatively large roll crown can be generated smoothly without any steps. As already mentioned, for this purpose it is preferable to provide at least one bearing whose outer ring width is larger than the inner ring width in order to minimize the gap between the outer rings of adjacent bearings.

Further, in the preferred embodiment 841 of the present invention, by using a lubricant-filled bearing, maintenance of the bearing can be greatly reduced.

On the other hand, an oil hole for supplying oil mist and an oil hole for collecting oil mist between the inner ring and outer ring of the rolling bearing may be provided in the arbor.

Further, an oil hole may be provided in the arbor for supplying oil between the cylindrical sleeve and the outer ring of the rolling bearing, especially when applied to a severe rolling mill with a high rotation speed or a large rolling load. Preferably, in that case, a mechanism is provided in which an oil hole is provided in the arbor, lubricating oil is supplied from the oil hole, and a seal is provided at the end of the arbor to seal the lubricating oil, thereby preventing wear of the sleeve and bearing. Burn-in can be prevented.

The above-described crown adjustment roll is used as a bank-up roll of a vertically arranged multi-stage rolling mill (if the roll in direct contact with the rolled material is the work roll, then all rolls other than the work roll are bank-up rolls). By installing one roll bender and combining it with an existing roll bender, you can effectively control the shape and profile. In addition, in the case of 2Hi mill, it will be used as a work roll.

In a preferred application example of the present invention, at least one crown adjustment roll according to the present invention is introduced into the work roll or backup roll of a vertically arranged multi-stage rolling mill, and the rotation angle of this roll around the arbor is adjusted. death,
Adjust the outer diameter generatrix shape of the sleeve to any crown within the range of concave crown to convex crown, combine it with a roll bender, and control the shape and/or profile of the rolled material according to the signal from the rolled material crown detector. This is what we do.

As described above, in the roll according to the present invention, since the amount of roll crown can be set by the inclination angle of the bearing, the amount of crown can be set large. For example, for a roll with a diameter of 1500 You can get it in a container. That of VC roll is 0.2~0.
It can be seen that the effect of the present invention is remarkable in that the roll crown amount is 3 to 5 times larger than that of 4 mm/radius.

(Operation) Next, the present invention will be described in more detail with reference to the accompanying drawings.

The basic roll structure of the present invention is shown in FIG. 1. FIG. 1 is a schematic partial sectional view of the right half of the vertical cross section of the center of the roll of the crown adjustment roll according to the present invention, with the center being the vertical cross section indicated by the dashed line. In Figure 0, which is symmetrical to the left and right, a lubricant-filled rolling bearing 21.
23 is fixed.

Positioning is performed by inclined spacers 81, 82 which are machined in an inclined manner, and the inner surfaces of the bushes 71, 72 and the arbor 1 are fixed by keying, shrink fitting, cold fitting, interference fitting, etc.

The bushings 71.72 and the inclined spacers 81.82 may take the shapes shown in FIGS.
It may be fixed only by pressing force from the side of the bearing, or it may be fixed directly to the arbor l by keying, shrink fitting, interference fitting, cold fitting, etc.

In addition, the inclined spacers 81 and 82 may be annular ones as shown in FIG. 10 (dl), or may be shaped as shown in (el). FIG. The circumferential circle and the outer circumferential circle are eccentric to each other at both ends, and the other end on the axial extension line of the maximum thickness portion at one end is thinner than the maximum thickness portion.Furthermore, the thrust acting on the cylindrical sleeve 90 As means for receiving force, a flange 52 and a bearing 51 having an outer ring fixed to the flange 52 are fixed to the end of the cylindrical sleeve 90. Therefore, in the roll according to the present invention, a work roll or an intermediate roll (not shown) is used. ) The components that are transmitted with the load and rotated during rolling are the cylindrical sleeve 90, the outer rings of the rolling bearings 21 and 23, the flange 52 that receives thrust force, and the outer ring of the bearing 51.

If the operating conditions are severe, an oil hole 8 is provided in the arbor 1 to supply lubricant to the gap between the outer shaft of the bearing 21, 23 and the inner surface of the cylindrical sleeve 90. A seal mechanism 85 for sealing is provided, and a rotary joint 10 for supplying oil from the outside is provided. Also, this part may be of an oil-tight type.

Further, as shown in a schematic side view in FIG. 2, an arbor angle adjusting device 70 is provided at one end of the arbor l, so that the rotation angle of the arbor, in other words, the roll crown can be arbitrarily selected. If the (IJI bevel angle of Putshiev 1 is α and the total length of the bearing 21 is l, then the crown δ-1α is obtained.If there is a work roll on the lower side of Fig. 1, it will be a concave crown, and this will be 180 When rotated by .degree., it becomes a convex crown.Therefore, the roll crown can be adjusted within the range of approximately 2.delta. from -.delta. to +.delta. by adjusting the rotation angle of the arbor l in the circumferential direction.

A specific example of the arbor angle adjustment device 70 is shown in a schematic side view in FIG. The angle of the arbor 1 is adjusted by rotating the handle 33.

When the rolling load is transmitted from the work roll, the cylindrical sleeve 90 is elastically deformed at the position where it contacts the work roll and comes into contact with the outer rings of the rolling bearings 21 and 23, and the cylindrical sleeve 90 rotates together with them. At this time, the roll crown formed by the outer ring of these bearings can be adjusted by adjusting the angle of the arbor.
Control from δ to +δ becomes possible.

Furthermore, in the preferred Bt'J of the present invention, in the roll structure described above, at the position where the inner surface of the sleeve 90 abuts the separation part of the inclined bearing, that is, the cut, the surface pressure is abnormal between the corner part of the bearing and the inner surface of the sleeve. To prevent this, the inner surface of the sleeve 90 is chamfered to form a recess at the position where the inner surface of the sleeve 90 comes into contact with the separation part of each bearing (not shown), as shown in FIG. 11.11 to avoid direct contact between the bearing corner and the inner surface of the sleeve.

As yet another modification, instead of providing the recess 11 on the inner surface of the sleeve as described above, a corner portion of the corresponding portion of the bearing corresponding to the sleeve chamfered portion may be chamfered.

Thus, in the rolling operation using the crown adjusting roll according to the present invention, the crown adjusting roll detailed above can be used in a vertical roll arrangement type multi-high rolling mill having the roll arrangement shown in FIGS. 5(^) to (F). Introduce at least one roll into the work roll or bank-up roll and combine with existing roll benders (work roll benzo ink, back unroll bending, double chink pending, etc.) to control the shape 1111m and/or profile of the rolled plate. In FIGS. 5(A) to 5(F), reference numeral 51 indicates a work roll, and 52 indicates a back unroll, which are well-known roll arrangements of a multi-high rolling mill. No explanation is necessary. In either case, signals from a shape meter or profile meter (not shown) provided at the entrance and/or exit side of the rolling mill cause the rolled material to have the desired shape. Then, the rotation angle (crown value) of the arbor of the crown adjustment roll according to the present invention used as a work roll or bank-up roll and the roll bending force are calculated so that the profile becomes the same. Rolling is performed by controlling the rotation angle of the arbor of the roll and the roll pending force so as to achieve this calculated value.

The arbor angle adjustment of a work roll or bank unroll using the crown adjustment roll according to the present invention is as follows:
It can also be carried out sequentially during rolling.

However, normally, it is easy to set the value in advance to an appropriate value depending on the dimensions, material quality, temperature, etc. of the rolled material, and mainly control the roll pending force during rolling. It is desirable to control the pending force of the roll bender and the crown amount of the bank-up roll at the same time in order to correct shape defects caused by compound elongation of the thin plate during cold rolling. Arbor 1
The arbor angle adjustment device 70 provided at the end of the journal is configured with an electric motor or a hydraulic device so that the movement can follow high-speed rolling, and performs high-speed, high-precision rotation angle positioning control.
However, since this device is normally used for bristling purposes, an inexpensive positioning mechanism consisting of, for example, a worm and a worm wheel, as explained in connection with FIG. 3, is sufficient.

Further, the oil hole 8 for supplying lubricating oil does not necessarily have to be provided at the center of the arbor 1 as shown in FIG.

Further, the lubricating oil and the discharge port need not be provided at one location, but may be provided at multiple locations.

FIG. 6 is a schematic explanatory diagram showing another aspect of the mist supply route, in which the oil holes 8 are provided at appropriate locations in the arbor 1, and the mist sent through the oil holes 8 is transferred from the mist supply route 62 to the bush 71 or 72, flows through the rolling bearings 21.23, and is discharged through a separately provided mist collection path 63.

Next, the present invention will be explained in more detail with reference to examples thereof.

Example 1 A one-sided bank-up roll of a small 4Hi rolling mill consisting of a work roll with a diameter of 801 mm and a barrel length of 460 m5 and a bank-up roll with a diameter of 240 sn and a barrel length of 460 mm had the roll structure shown in FIG. In other words, α=
A bushing 71 inclined by 0.2 degrees and a bushing 72 whose inner surface is eccentric by δ/2 with respect to the center of the outer diameter axis as shown in FIG. Sendzimir type rolling bearing 21.21 (outer diameter 240 m5 x inner diameter 150
mm x length 48mm) with a tight fit. Furthermore, Fig. 10 t keyed to the arbor 1
The rolling bearing 21.22 was positioned by the inclined spacer 81.82 shown in c).

Furthermore, the inner diameter of the outer ring of the rolling bearing 21.22 is 240.5 m.
A cylindrical sleeve 90 with a wall thickness of 5 m is loosely fitted, and a flange 52 that receives thrust force during rolling, and a lubricant-filled bearing 51 having an outer ring fixed to the flange are fixed to the end.

An oil hole 8 for supplying oil to the arbor 1 is provided, and a rolling bearing 21 is provided through the hole provided in the inclined spacer 81, 82.
．． Lubrication is performed between the outer ring 22 and the inner surface of the sleeve. This lubricating oil seal is a seal part 8 attached to the flange 52.
5.

Therefore, by rotating the arbor 1, the amount of crown of the bearing outer ring can be changed from a convex crown to a concave crown.

An arbor angle adjusting device 70 shown in FIG. 3 was provided at the end of the arbor shaft.

The deflection control ability of the work roll was investigated using the rolling mill thus obtained. Thickness 4m+eX between work rolls
An aluminum plate with a width of 350 mm was compressed under a load of 40 tons, and changes in roll deflection were investigated from the indentation distribution of the aluminum plate. At that time, the angle of the arbor 1 was varied from 0 to 180 degrees, and the amount of roll crown was varied in five steps from δ to -δ. When the angle of the arbor 1 is 0°, it corresponds to the roll crown amount δ. The results are shown in Figure 12 by the solid line fat.
In Fig. 2(a), the horizontal axis is the distance from the center of the plate width, and the vertical axis is the plate thickness deviation when the median value of the plate width is O.

When the maximum convex crown is 0°, the plate thickness distribution is such that the central portion is thin. When the maximum concave crown is 180°, the thickness distribution is such that the center portion is thick. It can be seen that by selecting any angle in between, the plate crown can be set freely.

In addition, in this case, the control range of the roll crown amount is
The control range is 3 to 5 times that of C-roll.

The broken line in Figure 12 tal indicates an arbor angle of O' 180°.
This is the result of using existing vendors in this case. The plate crown is reduced by the bending effect. That is, both effects can be superimposed. However, compared to the bender effect, the effect of the crown adjustment roll according to the present invention is much greater, so when the rolling load changes significantly depending on the plate thickness, plate width, material, etc., the workpiece can be adjusted by adjusting the rotation angle of the arbor 1. It is desirable that fine adjustments be made by the vendor after canceling roll deflection and establishing a good standard condition.

In addition, when rolling a thin plate by cold rolling or the like, shape defects are likely to occur, and the bender may work effectively only at the ends of the width of the plate. Even in such a case, the roll according to the present invention has a TJ effect up to the central part of the sheet width, so a good shape can be ensured when used in combination with a bender.

Furthermore, if a shape and profile detector is provided on the entry side and/or exit side of the rolling mill and the arbor angle adjustment and bender adjustment of the crow run adjustment roll of the present invention are automatically controlled, a plate with a good shape and profile can be obtained. I was also able to confirm that.

Furthermore, a continuous rolling test was conducted to examine durability. By using lubricant-filled rolling bearings, we have achieved maintenance-free bearings. Further, since oil is always supplied between the cylindrical sleeve 90 and the outer ring of the bearing, seizure and wear can be completely prevented.

Example 2 Almost the same as Example 1. α=0.4°, and the control crown amount was twice that in Example 1. Example 1
In the same manner as above, an aluminum plate with a thickness of 4IIIl and a width of 350 mm was compressed under a load of 40 tons, and the crown control effect was investigated from the indentation distribution of the aluminum plate.

The results are shown in FIG. 12 (bl), and the effect is about twice that of Example 1, and about 5 to 10 times that of the conventional VC roll.

In addition, the same effects as in Example 1 were obtained regarding durability and the like.

Example 3 Almost the same as Example 2. The thickness of sleeve 90 is 10
It was set to mm. Similarly, the crown control effect was investigated by compressing an aluminum plate under a load of 4 Qton.

The results are shown in Fig. 12(c).In this example, the rigidity of the sleeve increases and it becomes difficult to follow the bearing outer ring, so the crown control effect is somewhat smaller than in Example 2, but compared to the conventional VC
Approximately 4 to 6 times more effective than rolls.

Since the outer surface of the sleeve wears due to contact with work rolls, it is desirable that the sleeve be thicker, but the crown control effect will be smaller, so the sleeve thickness may be appropriately set according to each rolling condition.

Example 4 This was almost the same as Example 1, but the lubrication between the inner surface of the sleeve and the outer ring of the bearing through the oil supply hole 8 was stopped, and a solid arbor was used.

Further, a seal portion 85 is not added.

The crown control effect was obtained in exactly the same manner as in Example 1. In addition, in the durability test, wear and seizure occurred on the bearing outer ring and the inner surface of the sleeve, and the service life was lower than in Example 1. However, at low rotation speeds or low loads, there was no decrease in the service life of the sleeve at all. There were no problems.

(Effects of the Invention) If the crown adjustment roll according to the present invention is introduced as at least one of the backup rolls and rolling is performed in a rolling mill combined with an existing roll bender, the shape/profile control effect will be dramatically improved.

Compared to other conventional methods, only the rolls need to be changed, the cost is low, and there is no need to stop the rolling mill.

Furthermore, if only the sleeve shown in FIG. 1 is replaced, the roll can be used semi-permanently, which is economical.

Although it is very effective to use the crown adjustment roll shown in Figure 1 as a work roll, since it comes into direct contact with the rolled material, the sleeve thickness, sleeve material, sleeve hardness, etc. require more consideration than the back unroll. . Further, when the crown adjustment roll of the present invention is used as a back unroll in a two-high rolling mill as shown in FIG. 5(c),
This is especially effective since two-high rolling mills generally do not have a control function.

[Brief explanation of the drawing]

1 and 2 are a schematic cross-sectional view and a side view, respectively, showing a crown adjusting roll according to the present invention; FIG. 3 is a schematic side view showing an example of an arbor angle adjusting device used in a crown adjusting roll according to the present invention. Figure; Figure 4 is an explanatory diagram of the shape of the sleeve inner surface when the inner surface of the sleeve is chamfered; Figures 5 (^) to (F) are various vertically arranged multi-stage rolls using the crown adjustment roll of the present invention. A schematic explanatory diagram of the roll arrangement of a type rolling mill; FIG. 6 is a schematic explanatory diagram of the route; FIG. 7 is a schematic partial cross-sectional diagram of the final stage back-amp roll of a conventional Sendzimya rolling mill; A vertical cross-sectional view of a priddle roll of a multi-stage rolling mill with different circumferential speeds: Fig. 9 is a cross-sectional view taken from the line IX-IX in Fig. 8; 11 is a schematic cross-sectional view illustrating a bush, a bush, an inclined spacer, an inclined spacer, and an inclined spacer, respectively, of the crown adjustment roll of the present invention; ?-/ys FIG. and FIG. 12 are graphs showing the effect of the bearing of the crown adjustment roll of the present invention. 1: Annoy 21° 22: Rolling bearing 51: Bearing 70: Arbor angle adjustment device 7]. 72: Push 81゜82: 1st diagonal spacer 90: Cylindrical sleeve

Claims (7)

[Claims] (1) A straight arbor, a plurality of bushes fitted and fixed to the arbor, a plurality of rolling bearings whose inner rings are fitted to the bushes, and a cylindrical sleeve loosely fitted to the outer ring of the rolling bearings. a means for receiving a thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve; and an inclined spacer inserted into at least one gap between the bearings, the roll comprising at least two of the bushes. The above is
The inner circumferential circle and the outer circumferential circle are eccentric to each other at both ends of the bushing, and the other end on the axial extension line of the maximum wall thickness section at one end is thinner than the maximum wall thickness section, and the other end is thinner than the maximum wall thickness section at the center of the roll. A crown adjustment roll fitted to the arbor symmetrically with respect to a vertical cross section. (2) A straight arbor, a plurality of bushes fitted and fixed to the arbor, a plurality of rolling bearings whose inner rings are fitted and fixed to the bushes, and a cylindrical sleeve loosely fitted to the outer ring of the rolling bearing. a means for receiving a thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve; and an inclined spacer inserted into at least one gap between the bearings, the roll comprising: The inner and outer circumferential circles of the bushings are eccentric to each other, and the center axes of the inner and outer circumferential circles of the bushings are parallel to each other. Both ends of each bushing are eccentric to each other, and the other end on the axial extension line of the maximum thickness portion at one end is thinner than the maximum thickness portion, and the A crown adjustment roll fitted to an arbor. (3) The crown adjustment roll according to claim 1 or 2, wherein a plurality of rolling bearings are fitted into each bush, and a parallel spacer is inserted into the bush in a gap between the bearings. (4) The crown adjustment roll according to any one of claims 1 to 3, wherein the rolling bearing has an outer ring width larger than an inner ring width. (5) The crown adjustment roll according to any one of claims 1 to 4, wherein the rolling bearing is a lubricant-filled bearing. (6) The crown adjustment according to any one of claims 1 to 4, wherein the arbor has an oil hole for supplying oil mist and an oil hole for collecting oil mist between the inner ring and outer ring of the rolling bearing. roll. (7) The arbor has an oil hole for supplying oil between the cylindrical sleeve and the outer ring of the rolling bearing.
6. The crown adjustment roll according to any one of 6.