JP4127268B2 - Rolling roll support structure - Google Patents

Description

  The present invention relates to a roll support structure for a rolling mill.

  For example, as shown in FIG. 2A, a conventional rolling roll is supported by supporting a roll neck 81a of the rolling roll 81 via a rolling bearing 83 such as a four-row cylindrical roller bearing. (See Patent Document 1).

  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.

  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.

  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.

With respect to the new rolling roll 81 ′, the full width dimension, the edge position of the roll neck 81a, and the axial dimension of the connecting portion from the barrel portion 81b to the roll neck 81a are the same as the current rolling roll 81 in FIG. While keeping the same, only the barrel length of the barrel portion 81b is widened by the required dimension h. In such a new rolling roll 81 ′, the axial dimension of the roll neck 81 a is reduced with respect to the widening portion h, so that the width dimension of the roll neck 81 a is smaller than the width dimension of the rolling bearing 83. Therefore, conventionally, the current rolling bearing 83 is changed to a small new rolling bearing 83 'having a short axial dimension.
JP 60-44116 A

  In the conventional example described above, when the rolling mill is widened, a small rolling bearing 83 ′ with a short width is used as can be seen from the comparison between FIG. 2A and FIG. Therefore, it is pointed out that the cost increases because it is necessary to design and manufacture a new rolling bearing 83 '.

  In addition, since the position of the edge of the roll neck 81a 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.

  In view of such circumstances, the present invention aims to make it possible to use a rolling bearing for supporting a rolling roll without changing it when using a new rolling roll to widen a rolling mill. A rolling roll support structure after widening of the machine is provided.

The rolling roll support structure according to the first aspect of the present invention includes a barrel portion, a roll neck that is disposed closer to the roll end edge than the barrel portion and has a smaller diameter than the barrel portion, and a smaller diameter than the roll neck and disposed on the roll end side. current rolling rolls and, mounting ring member outer race of the tapered roller bearing is fitted into the inner periphery of the member to be fitted in the axial direction with a cylindrical portion to be fitted to the inner ring of the tapered roller bearing which receives the thrust load is A roll chock disposed on the edge side, a rolling bearing that supports the roll chock with respect to the roll chock, an outer periphery of a cylindrical portion that fits an inner ring of the rolling bearing device into an inner ring of the tapered roller bearing, and an edge side of the roll neck together is disposed, from the current rolling roll supporting structure having an inner ring pressing member positioned axially inner ring of said rolling bearing, for the mounting Body and without moving the roll edge side of the inner ring pressing member for axial spacing is small between the inner ring pressing member and a cylindrical portion to be fitted on the inner ring of the tapered roller, and the tapered roller bearing, the Without changing the shape and axial position of the member to which the outer ring of the tapered roller bearing fits and the mounting ring , the barrel portion is disposed on the roll edge side from the barrel portion and from the barrel portion. A roll neck having a small diameter, and a cylindrical portion that is smaller in diameter than the roll neck and is fitted on an inner ring of a tapered roller bearing that is disposed on the roll edge side and receives a thrust load, and the barrel portion is wider than the current rolling roll together we are, in the rolling roll supporting structure roll neck is replaced with the new rolling roll being reduced width for widening portion of the barrel length, entire width of the rolling bearing, Rorune' The rolling bearing is arranged in an overhanging state on the roll end side from the edge position of the roll neck, and the overhang portion of the rolling bearing is arranged at the end of the roll neck. It is received by the outer peripheral part of the inner ring | wheel pressing member of the rolling bearing arrange | positioned at the edge side at an axial direction and radial direction.

  A rolling roll support structure according to a second aspect of the present invention is the rolling roll support structure according to the first aspect, wherein the rollers of the rolling bearing are arranged on at least a part of the outer circumference of the overhang portion of the rolling bearing. Established.

  As described above, in the present invention, in short, in order to cope with, for example, widening a rolling mill by replacing the rolling roll with a new rolling roll, the rolling bearing for supporting the rolling roll is commonly used. . Thereby, the useless cost increase accompanying the modification for widening can be suppressed.

  If the rolling bearing is not changed in this way, the entire rolling bearing needs to be moved and arranged on the roll end side with respect to the roll chock, so that the axial center of the rolling bearing and the load center applied to the rolling bearing are required. The offset load increases and the eccentric load tends to increase. However, since the rolling bearing is not downsized as in the prior art, the life reduction of the rolling bearing is suppressed.

  Further, if the overhang portion of the rolling bearing is received by the inner ring pressing member, the load bearing capacity of the rolling bearing does not need to be reduced.

  In the rolling roll support structure according to the first aspect of the present invention, even when the rolling roll is replaced with a new rolling roll, the rolling bearing for supporting the rolling roll can be used in common. Cost increase can be suppressed.

  In addition, if the rolling bearing is not changed when replacing the rolling roll, the entire rolling bearing needs to be moved and arranged on the roll end side with respect to the roll chock, so that the axial center of the rolling bearing and the rolling bearing are arranged. Although the offset amount with respect to the load center is increased and the eccentric load is increased, the rolling bearing is not reduced in size as in the prior art, so that the life reduction of the rolling bearing is suppressed.

  Moreover, in the rolling roll support structure of the invention according to claim 1, by making the rolling bearing overhang from the edge position of the roll neck of the rolling roll, a relatively large rolling bearing can be used. Although the amount of offset between the axial center of the rolling bearing and the load center applied to the rolling bearing increases due to the overhang, the eccentric load increases, but the life of the rolling bearing is still reduced compared to the case of using a small rolling bearing. Can be suppressed. In particular, if the overhang portion of the rolling bearing is received by the inner ring pressing member, the load bearing capacity of the rolling bearing can be prevented from being lowered, and the effect of suppressing the life reduction is enhanced.

  The details of the present invention will be described based on embodiments shown in 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. In the illustrated rolling roll support structure, the roll neck 1 a of the rolling roll 1 is supported on the roll chock 2 via a rolling bearing 3 such as a four-row cylindrical roller bearing.

  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.

  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.

  In this embodiment, in order to increase the width of the rolling mill, for example, the rolling roll 1 shown in FIG. 1 (a) is only barrel length without changing the edge position of the roll neck 1a as shown in FIG. 1 (b). When replacing with a new rolling roll 1 'having a larger diameter, the arrangement of the rolling bearing 3 is devised so that the rolling bearing 3 can be used in common.

  Here, the form which replaces | exchanges the present rolling roll 1 shown to Fig.1 (a) for the new rolling roll 1 with a long barrel length shown to FIG.1 (b) is demonstrated.

  Here, the changes of the new rolling roll 1 'are the same as those shown in the conventional example, the full width dimension, the edge position of the roll neck 1a, and the axial direction of the connecting portion from the barrel portion 1b to the roll neck 1a. Only the barrel length of the barrel portion 1b is widened by the required dimension h while keeping the dimensions in common with the current rolling roll 1 of FIG.

  In such a new rolling roll 1 ′, the axial dimension of the roll neck 1 a is reduced with respect to the widening portion h. Therefore, if the rolling bearing 3 is used in common, the total width dimension of the rolling bearing 3 is It becomes larger than the width dimension of the neck 1a.

  Therefore, when the roll is replaced with a new rolling roll 1 ′, the rolling bearing 3 is moved to the roll end side with respect to the roll chock 2 for the widened portion of the barrel portion 1b. The widening portion h is arranged in an overhanging state on the roll end side with respect to the end edge position of the neck 1a. However, the overhang portion of the rolling bearing 3 is received by the thrust collar 8. Therefore, for the thrust collar 8, another thrust collar 8 ′ having a stepped portion 8 a on the outer peripheral portion is used with the replacement of the rolling roll 1. In this case, if there is no margin in the axial distance X between the thrust collar 8 'and the mounting ring 11, the thrust collar 8' cannot be moved in the roll end direction, which is an effective method.

  By the way, although the amount of offset between the load center and the axial center of the rolling bearing 3 becomes larger than the relationship in which the entire rolling bearing 3 is shifted and arranged on the roll end side as described above, the rolling bearing 3 is replaced with the conventional one. Thus, since it is commonly used without being reduced in size, the load application capability does not decrease, and therefore, it is possible to suppress a decrease in bearing life.

  Further, with the use of the new rolling roll 1 'as described above, the entire rolling bearing 3 is moved to the roll end side, and accordingly, the outer ring pressing members 4 and 5 are changed as follows. First, as the outer ring pressing member 4 on the barrel portion 1b side, a member having a small outer diameter is used so as to fit into the inner periphery of the overhanging piece 2a of the roll chock 2, and the outer ring pressing member 5 on the roll end side is used. The one with a short axial dimension is used.

  As described above, when the rolling mill is widened, the arrangement of the rolling bearing 3 can be devised so that the roll chock 2 and the rolling bearing 3 can be used in common without changing them. Compared with the case of changing to a short and small rolling bearing, it is possible to suppress the cost increase related to the widening and to suppress the life reduction of the rolling bearing 3.

In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
(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.

The longitudinal cross-sectional view which shows the upper half of the rolling-roll support structure of one Embodiment of this invention Longitudinal sectional view showing the upper half of a conventional rolling roll support structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current rolling roll 1 'New rolling roll 1a Roll neck of rolling roll 1b Barrel part of rolling roll 2 Roll chock 3 Rolling bearing 8 Thrust collar as inner ring pressing member 8' New thrust collar

Claims (2)

The barrel part,
A roll neck that is disposed closer to the roll edge than the barrel portion and has a smaller diameter than the barrel portion;
A cylindrical portion fitted on the inner ring of a tapered roller bearing which is smaller in diameter than the roll neck and is disposed on the roll edge side and receives a thrust load;
A current rolling roll having
A roll chock in which an attachment ring for fitting an inner circumference of a member to which an outer ring of the tapered roller bearing is fitted is disposed on the axial end edge side;
A rolling bearing that supports the roll chock with respect to the roll chock;
An inner ring pressing member that is disposed on the outer periphery of the cylindrical portion that fits the inner ring of the rolling bearing device with the inner ring of the tapered roller bearing and on the edge side of the roll neck, and that positions the inner ring of the rolling bearing in the axial direction;
From the current rolling roll support structure having
Since the axial distance between the mounting ring and the inner ring pressing member is small, the inner ring pressing member is not moved to the roll edge side, and
Without changing the shape and axial position of the cylindrical portion that fits into the inner ring of the tapered roller, the tapered roller bearing, the member that fits the outer ring of the tapered roller bearing, and the mounting ring. In addition,
The barrel part,
A roll neck that is disposed closer to the roll edge than the barrel portion and has a smaller diameter than the barrel portion;
A cylindrical portion fitted on the inner ring of a tapered roller bearing which is smaller in diameter than the roll neck and is disposed on the roll edge side and receives a thrust load;
Have
The barrel portion is wider than the current rolling roll, and the roll neck is reduced in width for the barrel length.
In the roll support structure replaced with a new roll ,
The overall width dimension of the rolling bearing is set to be larger than the width dimension of the roll neck, and the rolling bearing is disposed in an overhang state on the roll end side from the edge position of the roll neck,
The overhang portion of the rolling bearing is received in the axial direction and the radial direction by the outer peripheral portion of the inner ring pressing member of the rolling bearing arranged on the edge side of the roll neck.
A rolling roll support structure characterized by that. In the rolling roll support structure according to claim 1,
The roller of the rolling bearing is disposed on at least a part of the outer diameter direction outer periphery of the overhang portion of the rolling bearing,
A rolling roll support structure characterized by that.

Images