JP3640811B2 - Rolling roll support structure and rolling mill widening method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling roll support structure and a rolling mill widening method.
[0002]
[Prior art]
As a conventional rolling roll support structure, for example, as shown in FIG. 2A, the shaft end of the rolling roll 81, that is, the roll neck 81 a is supported to the roll chock 82 via a rolling bearing 83 such as a four-row cylindrical roller bearing. It is supposed to be.
[0003]
In FIG. 2A, 84 and 85 are outer ring pressing members for positioning the outer ring 83b of the rolling bearing 83 in the axial direction, 86 is a double-row tapered roller bearing that receives the thrust load of the rolling roll 81, and 87 and 88. Is a fillet ring as an inner ring pressing member for positioning the inner ring 83a of the rolling bearing 83 in the axial direction, a thrust collar, and 89 and 90 are two ring bodies serving as non-contact seals.
[0004]
The outer ring pressing member 84 on the barrel portion 81b side of the rolling roll 81 is attached to the projecting piece 82a of the roll chock 82 with a bolt or the like, and the outer ring pressing member 85 on the shaft end side of the rolling roll 81 is rolled. It is sandwiched between the outer ring 83 b of the bearing 83 and the mounting ring 91 of the double row tapered roller bearing 86.
[0005]
By the way, if there is a request for widening the rolling mill, the entire rolling mill can be re-installed. However, in the case of a relatively large rolling mill, it is extremely difficult and almost impossible to move the roll stand. Conventionally, for example, the state shown in FIG. 2A is changed to the state shown in FIG. 2B by replacing the current rolling roll 81 with a new rolling roll 81 ′ having a long barrel length.
[0006]
About this new rolling roll 81 ', with respect to the current rolling roll 81 in FIG. 2A, the full width dimension, the edge position of the roll neck 81a, and the axial direction of the connecting portion from the barrel portion 81b to the roll neck 81a Only the length of the barrel portion 81b is widened by the required dimension h while keeping the dimensions in common.
[0007]
In such a new rolling roll 81 ′, the width dimension of the roll neck 81 a is reduced by the width h, so that the width dimension of the roll neck 81 a is smaller than the width dimension of the current rolling bearing 83. For this reason, the existing rolling bearing 83 is conventionally changed to a small new rolling bearing 83 ′ having a short axial dimension.
[0008]
In addition, it is necessary to use a short one for the outer ring pressing member 84 on the barrel portion 81b side, but the outer ring pressing member 84 is not changed by processing the protruding piece 82a of the roll chock 82 to be short. Have finished.
[0009]
[Problems to be solved by the invention]
In the conventional example described above, when the rolling mill is widened, a small rolling bearing 83 ′ having a short width is used, as can be seen by comparing FIG. 2 (a) and FIG. 2 (b). In addition, it is pointed out that the cost increases because it is necessary to design and manufacture a new rolling bearing 83 '.
[0010]
In addition, since the position of the roll chock 82 is not changed, the offset amount between the axial center of the new rolling bearing 83 ′ and the load center increases, and the eccentric load increases. Thus, in addition to the load-bearing capacity of the new rolling bearing 83 'itself being lowered, the eccentric load is increased, so that the life of the new rolling bearing 83' itself tends to be reduced.
[0011]
In view of such circumstances, an object of the present invention is to allow for the common use of a rolling bearing even when replacing a rolling roll in anticipation of a future widening demand for a rolling mill in a rolling roll support structure. Yes.
[0012]
[Means for Solving the Problems]
The rolling roll support structure according to the invention of claim 1 is a structure that supports the roll neck of the rolling roll with respect to the roll chock via a rolling bearing,
Outer ring pressing members for positioning the outer ring of the rolling bearing in the axial direction are respectively provided at both axial ends of the bearing mounting holes of the roll chock, and the outer ring pressing members are constituted by a plurality of members that are separated in the axial direction. The outer ring pressing member includes a stopper and a spacer, and either one of the outer ring pressing members is configured such that the stopper is fixed to the roll chock and the spacer is interposed between the stopper and the outer ring of the rolling bearing. The remaining outer ring pressing member is used in a form in which a stopper is applied to the outer ring of the rolling bearing and the stopper is fixed to the roll chock via a spacer. The spacer is removed when the current rolling roll is replaced with a new rolling roll having a large barrel length, and the axial length of the spacer predicts the replacement. Planning, and is set based on the difference dimension of the barrel length of the current rolling roll barrel length and the new rolling roll.
[0013]
The rolling roll support structure according to the invention of claim 2 is a structure that supports the roll neck of the rolling roll with respect to the roll chock via a rolling bearing, and the rolling roll support structure is provided at both ends in the axial direction of the bearing mounting hole of the roll chock. An outer ring pressing member for positioning the outer ring in the axial direction is provided, and an inner ring pressing member for positioning the inner ring in the axial direction is disposed at each axial end of the inner ring of the rolling bearing at the axial end of the rolling roll. The outer ring pressing members are composed of a plurality of members that are separated in the axial direction, and the outer ring pressing member includes a stopper and a spacer, and one of the outer ring pressing members fixes the stopper to a roll chock. The other outer ring pressing member is used in a form in which a spacer is interposed between the stopper and the outer ring of the rolling bearing. The stopper is applied to the outer ring of the rolling bearing, and this stopper is fixed to the roll chock through a spacer. The spacer is a new rolling roll having a large barrel length. The length of the spacer in the axial direction is determined based on the difference between the barrel length of the current rolling roll and the barrel length of the new rolling roll. Is set.
[0016]
The rolling mill widening method according to the invention of claim 3 is a method of exchanging the rolling roll in the rolling roll support structure of claim 1 or 2 with a new rolling roll having a large barrel length, and as a new rolling roll, Prepare a roller with a barrel part wider than the current rolling roll and a roll neck wider than the current rolling roll. After replacing the new rolling roll, replace the rolling bearing or the rolling bearing of the same specification with a roll chock. In this example, the barrel portion is moved and arranged on the roll end side, the spacer of the outer ring pressing member is removed, and the rolling bearing is positioned in the axial direction only by the stopper.
[0017]
As described above, in the present invention, in short, an outer ring pressing member is used so that the current rolling roll can be replaced with a new rolling roll having a long barrel length in advance, and in particular, the rolling bearing among the peripheral parts can be used in common during the replacement. Is devised. Thereby, the useless cost increase accompanying the widening remodeling of a rolling mill can be suppressed.
[0018]
If the rolling bearing is not changed as in the present invention at the time of replacing the rolling roll, the entire rolling bearing needs to be moved to the roll end side with respect to the roll chock, so the center of the rolling bearing in the axial direction is required. However, the amount of offset between the rolling bearing and the center of the load increases, and the eccentric load tends to increase. Will be.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0020]
FIG. 1 is a longitudinal sectional view showing an upper half of a rolling roll support structure according to an embodiment of the present invention. In the rolling roll support structure shown in the figure, the shaft end of the rolling roll 1, that is, the roll neck 1a, is supported on the roll chock 2 via a rolling bearing 3 such as a four-row cylindrical roller bearing.
[0021]
In the figure, 4 and 5 are outer ring pressing members for positioning the outer ring 3b of the rolling bearing 3 in the axial direction, 6 is a double-row tapered roller bearing that receives the thrust load of the rolling roll 1, and 7 and 8 are inner rings of the rolling bearing 3. A fillet ring as an inner ring pressing member for positioning 3a in the axial direction, a thrust collar, and 9 and 10 are two annular bodies that are non-contact seals.
[0022]
The outer ring pressing member 4 on the barrel portion 1b side of the rolling roll 1 is attached with a bolt or the like to the protruding piece 2a of the roll chock 2, and the outer ring pressing member 5 on the shaft end side of the rolling roll 1 is rolled. It is sandwiched between the outer ring 3 b of the bearing 3 and the mounting ring 11 of the double row tapered roller bearing 6.
[0023]
In this embodiment, the outer ring pressing members 4 and 5 are configured by stoppers 4a and 5a that are separated in the axial direction and spacers 4b and 5b.
[0024]
In the outer ring pressing member 4 on the barrel portion 1 b side of the rolling roll 1, the stopper 4 a is applied to the outer ring 3 b of the rolling bearing 3, and this stopper 4 a is placed on the protruding piece 2 a of the roll chock 2 via the spacer 4 b. It can be attached with bolts. On the other hand, in the outer ring pressing member 5 on the shaft end side of the rolling roll 1, the stopper 5 a and the spacer 5 b are interposed between the ring body 11 and the outer ring 3 b of the rolling bearing 3.
[0025]
The spacers 4b and 5b are removed when the current rolling roll 1 shown in FIG. 1 (a) is replaced with a new rolling roll 1 'having a long barrel length shown in FIG. 1 (b). , 5b is set based on the difference dimension h between the barrel length of the current rolling roll 1 and the barrel length of the new rolling roll 1 ′, with the replacement planned in advance.
[0026]
Next, in order to widen the rolling mill, a mode in which the current rolling roll 1 shown in FIG. 1A is replaced with a new rolling roll 1 having a long barrel length shown in FIG. 1B will be described.
[0027]
Here, as the new rolling roll 1 ′, the length of the barrel portion 1 b is the same as that of the current rolling roll 1 while keeping the overall width dimension and the axial dimension of the connecting portion from the barrel portion 1 b to the roll neck 1 a in common. The width is widened by the required dimension h, and the edge position of the roll neck 1a is extended to the roll end side for the widened portion h of the barrel portion 1b.
[0028]
With such a design, only the thrust collar 8 needs to be changed to the short new thrust collar 8 ', and other peripheral parts can be used in common.
[0029]
When the new rolling roll 1 'is replaced, it is necessary to move the rolling bearing 3 to the roll end side as much as the barrel portion 1b is widened. , 5 also needs to be changed, but in this embodiment, by removing the spacers 4b, 5b of the outer ring pressing members 4, 5, the movement of the rolling bearing 3 is allowed and the outer ring pressing members 4, 5 The rolling bearing 3 can be positioned in the axial direction only by the stoppers 4a and 5a.
[0030]
However, since the entire rolling bearing 3 is shifted to the roll end side, the offset amount between the load center and the axial center of the rolling bearing 3 is increased in relation to the stationary roll chock 2. Although it is unavoidable, the rolling bearing 3 does not have to be reduced in size as in the prior art, so that the load application capability is not lowered and the bearing life can be prevented from being lowered. Incidentally, the life reduction rate of the rolling bearing after widening for the embodiment of FIG. 1 and the conventional example of FIG. 2 is shown in the graph of FIG. In the graph in the figure, the horizontal axis represents the ratio (4h / B) between the width B of the rolling bearing and the width h, and the vertical axis represents the life reduction rate of the rolling bearing. The life reduction rate is 1.0. As a result, if the ratio (4h / B) is in the range up to 0.2, it can be seen that this embodiment is more effective because the lifetime reduction rate is smaller than that of the conventional example.
[0031]
As described above, the outer ring presser members 4 and 5 are constituted by a plurality of separable members in anticipation of widening the rolling mill in the future. When this is done, it becomes possible to cope by simply removing a part of the outer ring pressing members 4, 5, and it is not necessary to change other peripheral parts. In particular, since the rolling bearing 3 can be used in common, there is no concern that the bearing life will be reduced as compared with the case of using a small new rolling bearing with a short axial dimension as in the prior art.
[0032]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0033]
(1) Although the four-row cylindrical roller bearing is illustrated as the rolling bearing 3 in the above embodiment, the number of the rows is not limited, and may be a tapered roller bearing.
[0034]
(2) In the above embodiment, the spacers 4b and 5b are removed when the rolls are replaced with new rolling rolls for widening, but the spacers 4b and 5b are replaced with ones having a short width according to the amount of widening. Or the width can be reduced.
[0035]
(3) In the above embodiment, the thrust collar 8 is changed to the short new thrust collar 8 ′ when the roll is replaced with a new rolling roll for widening, but there are a plurality of thrust collars 8 similar to the outer ring pressing members 4 and 5. You may make it divide | segment into this member and remove either of the member divided | segmented according to the amount of widening.
[0036]
(4) In the above embodiment, the load center and the axial center of the rolling bearing 3 are offset in the state before widening shown in FIG. 1 (a), but the offset is zero in this state before widening. Or can be offset in the opposite direction to the case of FIG. 1A, and the present invention can be applied to either case.
[0037]
【The invention's effect】
In the rolling roll support structure of the invention of claim 1 or 2 , in anticipation of a case where the rolling mill is to be widened in the future, the rolling bearing among the peripheral parts can be used in common at the time of the replacement. The useless cost increase accompanying the widening of the rolling mill can be suppressed.
[0038]
In addition, even if the rolling roll is replaced with a new rolling roll, if the rolling bearing is not changed as in the present invention, the entire rolling bearing must be moved and arranged on the roll end side with respect to the roll chock, and the rolling bearing The offset amount between the axial center of the roller and the center of the load applied to the rolling bearing increases and the eccentric load increases. However, the rolling bearing is not downsized as in the prior art, so that the life reduction of the rolling bearing is suppressed. It will be.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an upper half of a rolling roll support structure according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing an upper half of a conventional rolling roll support structure. FIG. 2 is a graph showing the life reduction rate of the rolling bearing after widening of the configuration and the conventional example of FIG.
DESCRIPTION OF SYMBOLS 1 Current rolling roll 1 'New rolling roll 1a Roll roll roll neck 1b Rolling roll barrel part 2 Roll chock 3 Rolling bearing 3a Rolling bearing inner ring 3b Rolling bearing outer ring 4 First outer ring pressing member 4a First outer ring pressing member stopper 4b Spacer 5 of the first outer ring pressing member 5 Second outer ring pressing member 5a Stopper 5b of the second outer ring pressing member 7 Spacer of the second outer ring pressing member 7 Fillet ring as the inner ring pressing member 8 Thrust collar as the inner ring pressing member

Claims (3)

It is a structure that supports the roll neck of the rolling roll via a rolling bearing with respect to the roll chock,
Outer ring pressing members for positioning the outer ring of the rolling bearing in the axial direction are provided at both axial ends of the bearing mounting holes of the roll chock,
The outer ring pressing members are composed of a plurality of members that are separated in the axial direction ,
The outer ring pressing member includes a stopper and a spacer, and either one of the outer ring pressing members is configured such that the stopper is fixed to the roll chock and the spacer is interposed between the stopper and the outer ring of the rolling bearing. The other outer ring pressing member that is used is a type in which a stopper is applied to the outer ring of the rolling bearing, and this stopper is fixed to the roll chock via a spacer,
The spacer is removed when the current rolling roll is replaced with a new rolling roll having a large barrel length, and the axial length of the spacer is scheduled in advance to replace the barrel of the current rolling roll. A rolling roll support structure, characterized in that it is set based on a difference dimension between a length and a barrel length of the new rolling roll . It is a structure that supports the roll neck of the rolling roll via a rolling bearing with respect to the roll chock,
Outer ring pressing members for positioning the outer ring of the rolling bearing in the axial direction are provided at both axial ends of the bearing mounting holes of the roll chock,
Inner ring pressing members for positioning the inner ring in the axial direction are arranged at both axial ends of the inner ring of the rolling bearing at the axial end of the rolling roll,
The outer ring pressing members are composed of a plurality of members that are separated in the axial direction ,
The outer ring pressing member includes a stopper and a spacer, and either one of the outer ring pressing members is configured such that the stopper is fixed to the roll chock and the spacer is interposed between the stopper and the outer ring of the rolling bearing. The other outer ring pressing member that is used is a type in which a stopper is applied to the outer ring of the rolling bearing, and this stopper is fixed to the roll chock via a spacer,
The spacer is removed when the current rolling roll is replaced with a new rolling roll having a large barrel length, and the axial length of the spacer is scheduled in advance to replace the barrel of the current rolling roll. A rolling roll support structure, characterized in that it is set based on a difference dimension between a length and a barrel length of the new rolling roll . A method of exchanging a rolling roll in the rolling roll support structure according to claim 1 or 2 with a new rolling roll having a large barrel length,
As the new rolling roll, the barrel part is wider than the current rolling roll, and the roll neck is prepared to be widened for the widening,
After replacement of the new rolling roll, the rolling bearing or the rolling bearing of the same specification as the rolling bearing is moved and arranged on the roll end side in the roll chock for the widened portion of the barrel part,
A rolling mill widening method characterized by removing a spacer of an outer ring pressing member and positioning the rolling bearing in an axial direction only by a stopper.

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