JP2004009224A - Polishing jig of outside diameter of outer ring of bearing for rolling mill backup roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing jig with improved versatility for polishing an outside diameter of an outer ring of not only a bearing with an engagement hole on the outer ring, but also a bearing without an engagement hole. <P>SOLUTION: This polishing jig of an outside diameter of the outer ring of a bearing for a rolling mill backup roll comprises: a shaft body 2 fitted with an inner ring 104 of a bearing 100 for a rolling mill backup roll; a pressure oil chamber 12 formed inside the shaft body 2 in such a manner that an outer peripheral part of the shaft body 2 extends outward in a radial direction by supplying the pressure oil; and inner ring fixing parts 16, 26 for fixing the inner ring 104 in an axial direction. The jig is equipped with an outer ring 101 of the bearing 100, and outer ring holding parts 24, 28 integrally rotatably holding the outer ring 101. The outer ring holding parts 24, 28 are equipped with a rotation force transmitting part 29 for transmitting a rotation force from a rotation force generating device generating the rotation force for rotating the outer ring 101. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a polishing jig for an outer diameter of an outer ring of a bearing for a backup roll of a rolling mill.
[0002]
[Prior art]
Roller back-up roll bearings (backing bearings) are in contact with the rolls when the outer ring rotates, so the outer ring outer diameter may drop early or slip, which affects the sheet thickness during rolling. It is necessary to frequently re-polish the outer diameter of the outer ring.
BACKGROUND ART Conventionally, as a polishing jig for the outer diameter of an outer ring of a bearing for a backup roll of a rolling mill, there is a polishing jig described in Japanese Patent Publication No. 63-41704 (hereinafter referred to as a conventional technique). In the prior art polishing jig (re-polishing device), the polishing jig to which the inner ring is fitted is radially outwardly expanded and expanded by hydraulic pressure, so that the fitting clearance of the bearing and the internal radial gap are eliminated. By rotating only the outer ring, the outer diameter of the outer ring can be polished with high accuracy.
[0003]
[Problems to be solved by the invention]
In the prior art, in order to rotate the outer ring at the time of polishing, an engagement hole (a button hole) is formed in the axial end surface of the outer ring of the bearing, and the engagement hole is formed so as to protrude from the work head of the polishing machine. The outer ring rotates in the same way as the work head by engaging the tip of the kelet.
Therefore, in the related art, it is necessary that an engagement hole is formed in the end surface of the outer ring in order to rotate the outer ring, and it is not possible to perform re-polishing of a bearing in which the engagement hole is not formed in the end surface. .
[0004]
However, in reality, there are many bearings in which an engagement hole is not formed on an end face. Therefore, in order to perform re-polishing using the polishing jig of the related art, it is necessary to separately form an engagement hole in the bearing.However, if an engagement hole is formed in a bearing in which an engagement hole is not originally formed, The strength of the bearing may be reduced. For this reason, it is practically difficult to separately form an engagement hole in the bearing, and a conventional polishing jig could not be used for a bearing without an engagement hole.
[0005]
Further, in the bearing to be re-ground in the prior art, as shown in FIG. 2 of Japanese Patent Publication No. 63-41704, the outer ring 12 is provided with a flange 14 on the inner diameter side (note that reference numerals 12 and 14). 14 are those of Japanese Patent Publication No. 63-41704), and some bearings do not have the collar 14 on the outer ring 12.
That is, as shown in FIG. 2, in the case of the bearing 100 having no flange, a resin-made thrust washer 103 is disposed between the backup saddle 102 and the outer ring end face 101a for fixing the axial position of the outer ring 101. . In the case of the bearing 100 requiring the thrust washer 103, heat cracks are generated on the outer ring end face 101a due to friction with the thrust washer. Therefore, if an engagement hole is formed in the outer ring end face 101a, strength is reduced and damage is easily caused. . Therefore, in the case of the bearing 100 requiring the thrust washer 103, it is more difficult to form the engagement hole.
[0006]
Further, in the case of the bearing 100 which requires the thrust washer 103 as shown in FIG. 2, the outer ring 101 cannot be fixed in the axial direction by the thrust washer 103 when the bearing 100 is mounted on the conventional polishing jig. However, the prior art polishing jig could not be used.
[0007]
The present invention has been made in view of such a problem, and an object of the present invention is not limited to a bearing having an engagement hole formed in an outer ring in a hydraulic-integrated polishing jig as in the related art. It is another object of the present invention to provide a polishing jig with improved versatility so that the outer diameter of the outer ring can be polished even in a bearing having no engagement hole.
Another object of the present invention is to further improve the versatility of the polishing jig by making it possible to cope with a bearing in which the outer ring cannot be positioned in the axial direction without a thrust washer.
[0008]
[Means for Solving the Problems]
The present invention relates to a shaft body into which an inner ring of a rolling mill backup roll bearing is fitted, and the inside of the shaft body such that an outer peripheral portion of the shaft body projects radially outward by supply of pressure oil. In a polishing jig for the outer diameter of the outer ring of a bearing for a rolling mill backup roll, comprising a pressure oil chamber formed on the inner ring fixing portion for fixing the inner ring in the axial direction, the outer ring of the bearing is integrally rotatable. An outer ring holding unit that holds the outer ring; and the outer ring holding unit includes a torque transmitting unit that transmits the torque from a torque generator that generates a torque for rotating the outer ring. It is characterized by.
[0009]
According to the present invention, when the outer ring is held by the outer ring holding unit, the turning force from a turning force generator such as a polishing machine can be transmitted to the outer ring via the turning force transmission unit provided in the outer ring holding unit. it can. Therefore, the outer ring can be rotated regardless of the presence or absence of the engagement hole of the outer ring, and the versatility of the polishing jig is enhanced.
[0010]
Further, it is preferable that the outer race holding portion fixes the outer race in the axial direction of the shaft body. In this case, even if the bearing cannot position the outer ring in the axial direction without the thrust washer, the outer ring can be fixed in the axial direction by the outer ring holding portion, and the versatility of the polishing jig is further improved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a polishing jig 1 according to an embodiment. The polishing jig 1 is used for a bearing assembly without disassembling a rolling mill backup roll bearing (backing bearing) 100 as shown in FIG. This is used for re-polishing the outer ring outer diameter 101b as it is. The polishing jig 1 includes a shaft 2 into which an inner ring 104 of a bearing assembly 100 is fitted, and a first bearing fixing portion 3 and a second bearing fixing portion 4 provided on the shaft 2 so as to face each other in the axial direction. Have been.
[0012]
The shaft body 2 includes a shaft 6 and a sleeve 7 mounted on the outer periphery of the shaft 6. The shaft 6 is supported and fixed between both centers of a polishing machine such as a cylindrical grinder. The sleeve 7 is fitted on the outer periphery of a central portion of the shaft 6 in the axial direction. A concave portion is formed on the inner peripheral surface of the sleeve 7, whereby a pressure oil chamber 12 is formed inside the shaft body 2. The pressure oil chamber 12 is a space between the outer peripheral surface of the shaft 6 and the inner peripheral surface of the sleeve 7, and is continuous in the circumferential direction and substantially coincides with the size of the inner ring 104 in the axial direction. The length is such that the inner ring 104 can be fixed with high accuracy by supplying oil.
An oil passage 13 for supplying pressure oil to the pressure oil chamber 12 is provided inside the shaft 6. An open end of the oil passage 13 is located on the outer peripheral surface of the shaft 6, and a pressure oil supply port 14 for connecting a pressure oil supply device is provided at the open end.
[0013]
An outer flange 16 protruding radially outward is formed on one axial end (right side in FIG. 1) of the sleeve 7, and an inner flange 16 protruding radially inward on the other axial end (left side in FIG. 1). A collar 17 is formed. A fixed ring 19 is attached to the outer flange 16 by bolts 18, and a sleeve fixing nut 20 is screwed to the shaft 6 on the inner flange 17 side. It is positioned and fixed in the direction.
[0014]
The first bearing fixing portion 3 is provided on the shaft 6 so as to be located on one axial side (the right side in FIG. 1) of the sleeve 7. Further, the second bearing fixing portion 4 is provided on the shaft 6 at a position on the other axial side (left side in FIG. 1) of the sleeve.
The first bearing fixing portion 3 is provided rotatably with respect to the main body 22 via a bearing (taper roller bearing) 23 with a main body 22 screwed and mounted on a screw portion 6 a formed on the shaft 6. And a first outer ring fixing portion 24 provided.
[0015]
The second bearing fixing portion 4 is rotatable with respect to the main body 26 via a bearing (taper roller bearing) 27 with respect to the main body 26 which is screwed and mounted on a screw portion 6 b formed on the shaft 6. And a second outer ring fixing portion 28 provided.
The main body 26 of the second bearing fixing part 4 is disposed axially opposite to the outer flange 16 of the sleeve 7, and the main body 26 and the outer flange 16 of the second bearing fixing part 4 are polished. An inner ring fixing portion for holding the inner ring 104 of the backing bearing (bearing to be polished) 100 in a sandwiching manner from both sides and fixing the inner ring 104 in the axial direction is configured. The main body 26 and the outer flange 16 are also roller fixing portions that position the rollers 105 of the backing bearing 100 in the axial direction.
[0016]
The first outer ring fixing portion 24 and the second outer ring fixing portion 28 are arranged to face each other in the axial direction, and the outer ring fixing portions 24 and 28 are fixed to the outer ring 101 of the backing bearing (bearing to be polished) 100 to be polished. Is held in a sandwiching shape from both sides, and further constitutes an outer ring holding portion that is fixed in the axial direction.
Since both outer ring fixing portions 24 and 28 constituting the outer ring holding portion are rotatable with respect to the main body portions 22 and 26 fixed to the shaft 6, the outer ring holding portions 24 and 28 are attached to the shaft 6 (the shaft 2). Relative to the inner ring 104 fixed to the shaft body 2. Therefore, the polishing jig 1 and the inner ring 104 are fixed, and the outer ring 101 and the outer ring holding portions 24 and 28 can be integrally rotated.
[0017]
An engagement hole 29 is formed in the second outer ring fixing portion 28 for engaging a kere projected from a work head of a polishing machine (rotational force generating device) such as a cylindrical grinder. The hole 29 serves as a rotational force transmitting unit to which the rotational force from the work head is transmitted, and the outer ring 101 rotates together with the work head. Here, a pin or the like may be used as the rotational force transmitting unit instead of the engaging hole 29.
[0018]
Further, since the outer ring holding portions 24 and 28 abut the outer ring 101 by being in contact with both sides of the outer ring 101 in the entire circumferential direction, the polishing liquid and foreign matter may enter the inside of the backing bearing 100 during polishing. Has been prevented.
An oil seal 30 is provided between the main body portion 22 and the first outer ring fixing portion 24 and between the main body portion 26 and the second outer ring fixing portion 8, and the first bearing fixing portion 3 and the second bearing The fixing portions 4 are each configured as a grease-sealed type with an oil seal, and are excellent in internal lubrication and maintenance.
[0019]
To mount the backing bearing 100 on the polishing jig 1, first, the backing bearing 100 is removed from the left side in FIG. 1 with the first bearing fixing part 3 and the second bearing fixing part 4 removed from the shaft body 2. The body 2 is fitted, and one side surface of the bearing inner ring 104 is brought into contact with the outer flange 16. Subsequently, the second bearing fixing portion 4 is mounted on the shaft body 2, and the inner ring is fixed by the outer flange 16 and the main body 26. At this time, since the inner ring contact surface 26a of the main body portion 26 of the second bearing fixing portion 4 and the outer ring contact surface 28a of the second outer ring fixing portion 28 are formed flush, the outer ring contact surface 28a is also the outer ring. Contact 101. Finally, when the first bearing fixing portion 3 is mounted on the shaft body 2, the outer ring 101 is held and fixed by the first outer ring fixing portion 24 and the second outer ring fixing portion 28. Further, the outer diameter of the first outer ring fixing portion 24 and the second outer ring fixing portion 28 is smaller than the outer diameter of the bearing 100 so as not to hinder the polishing of the outer ring outer diameter 101. In the present embodiment, since the second bearing fixing portion 4 has both functions of fixing the inner ring and fixing the outer ring to share the components, the number of components is reduced, and assembly and disassembly are easy. It has become.
[0020]
The polishing jig 1 on which the backing bearing 100 is mounted is attached to a polishing machine. Then, a pressure oil pipe of an unillustrated manual or automatic pressure oil supply device is connected to the pressure oil supply port 14 of the oil passage 13 of the shaft 6 to supply pressure oil to the pressure oil chamber 12. When the pressure oil is supplied to the pressure oil chamber 12, the outer peripheral portion of the shaft body (sleeve 7) protrudes outward in the radial direction, and further, the inner ring 104 protrudes outward in the radial direction. The oil pressure is appropriately adjusted so that the radial gap of the bearing 100 is eliminated, and the polishing can be accurately performed by eliminating the radial gap.
[0021]
Further, while the shaft body 2 is fixed so as not to rotate, the polishing machine is driven to rotate the outer ring 101 through the engagement hole 29 which is a rotational force transmitting unit, so that the outer diameter of the outer ring 101 is Can be polished again.
[0022]
According to the polishing jig 1 of the present embodiment, even if the backing bearing 100 has no engagement hole (button hole) in the outer ring, it is possible to accurately re-polish with the polishing jig 1 integrated with the hydraulic pressure. It is not necessary to process the engagement hole, and it is possible to avoid a decrease in the strength of the outer ring due to the provision of the engagement hole. In addition, even if the backing bearing 100 has a structure in which the outer ring 101 cannot be fixed in the axial direction because it has no flange as shown in FIGS. It becomes possible.
[0023]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it can hold | maintain an outer ring by an outer ring holding | maintenance part, and can transmit the rotational force from the rotational force generator, such as a grinder, to the outer ring via the rotational force transmission part provided in the outer ring holding | maintenance part. . Therefore, the outer ring can be rotated irrespective of the presence or absence of the engagement hole of the outer ring, and the versatility of the polishing jig is enhanced. Further, the outer ring holding portion fixes the outer ring in the axial direction of the shaft body. In this case, the outer ring can be fixed in the axial direction by the outer ring holding portion, and the versatility of the polishing jig is further improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a polishing jig.
FIG. 2 is a sectional view of a backing bearing having no flange.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polishing jig 2 Shaft 12 Pressure oil chamber 16 Outer flange (Inner ring fixing part)
24 1st outer ring fixing part (outer ring holding part)
26 Body (Inner ring fixing part)
28 Second outer ring fixing part (outer ring holding part)
29 engagement hole (rotational force transmission part)

Claims (2)

A shaft body into which the inner ring of the rolling mill backup roll bearing is fitted, and formed inside the shaft body such that an outer peripheral portion of the shaft body projects radially outward by supply of pressure oil. A pressure oil chamber,
An inner ring fixing portion for fixing the inner ring in the axial direction,
In the polishing jig for the outer diameter of the outer ring of the rolling mill backup roll bearing with
An outer ring holding portion that holds the outer ring so that it can rotate integrally with the outer ring of the bearing,
The outer ring holding portion is provided with a rotating force transmitting portion to which the rotating force is transmitted from a rotating force generating device that generates a rotating force for rotating the outer ring. Polishing jig for outer ring outer diameter. The polishing jig for an outer diameter of an outer ring of a bearing for a backup roll of a rolling mill according to claim 1, wherein the outer ring holding portion fixes the outer ring in an axial direction of the shaft body.

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