JPH0367827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rolling bearing in which the outer peripheral surface of the outer ring is directly substituted for a roll, such as a back-up roll of a rolling mill or a roll for a leveler, and which is fitted into a shaft. The present invention relates to a grinding device for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft.

Conventional technology This type of rolling bearing cannot simultaneously transmit rotational force from the shaft to its outer ring, so unless rotational force is applied from the outside of the bearing to the side surface of the outer ring by chipping, etc., the outer ring must be ground using a commercially available grinder. can't do it. Even if the outer ring is ground by applying a rotational force to the outer ring from the side surface of the outer ring due to this chipping, the moment force causes the outer ring to swing around, making the grinding accuracy unstable. Therefore, in the past, this rolling bearing was disassembled into pieces, only the outer ring was taken out, and the outer ring was ground as a single unit, thereby ensuring the accuracy of the outer ring itself.

On the other hand, as shown in Japanese Patent Application Laid-Open No. 52-43195, a device has been proposed in which the outer ring is ground with the shaft attached.

Problems to be Solved by the Invention For example, in the case of a back-up roll for a rolling mill, the outer circumferential surface of the outer ring also serves as the outer circumferential surface of the roll. It is also damaged by biting scratches, etc., which leads to a decline in the quality of the rolled product.
It is necessary to repeat this correction grinding of the outer circumferential surface frequently, and for this purpose, the above-mentioned grinding method is performed.
Also proposed.

In order to remove just the outer ring and grind it, the rolling bearing must be disassembled one by one.
It is very time-consuming, increases the number of grinding setup man-hours and processing man-hours, and requires disassembly, reassembly, and re-cleaning during this work, which is very troublesome. This has a major disadvantage in that it can damage the raceway surface of the shaft and outer ring, leading to premature bearing life and deterioration of product quality.

JP-A No. 52-43195 is a grinding device for a Sendzimir rolling mill that uses a rolling bearing with a shaft, and grinds the outer circumferential surface of the outer ring with the shaft still attached, but the grinding device uses rolling bearings with a shaft. A bucking bearing is placed on the two drive rolls, and the rotation of the saddle leg positioned between the two drive rolls is stopped by a brake shoe. Grinding is performed by pressing a whetstone against the surface from diagonally above, but since the height from the bottom of the saddle leg to the center of the back-up roll is the standard for determining the wall thickness of the outer ring, Due to wear and deformation of the lower surface of the legs during use in a rolling mill, there is a problem of uneven wall thickness between all back-up rolls, and there is a problem with single-piece assemblies in which the bearing and shaft are integrated without saddles. There is a problem in that it cannot be used for certain rolling bearings.

In addition, since the lower surface of the back-up roll is supported by two parallel drive rolls and driven to rotate, and simply pressed against it with a grinding wheel from diagonally above, grinding is performed. Since it is impossible to completely reduce the internal gap (radial gap) to zero, (a) moment force and If there is a change due to deflection due to the weight of each drive roll, the cylindricity of the roll will be lost.

(b) It is difficult to manage the pressing force between the two driving rolls that support the back-up roll so that it is uniform, so there are drawbacks such as difficulty in achieving machining accuracy due to changes in the pressing force.

Means for Solving the Problems The present invention solves the problems of the prior art and re-grinds the outer ring of the bearing while attached to the shaft without reducing the cylindricity or roundness of the outer ring. The purpose is to reduce the number of man-hours required for bearing disassembly, reassembly, and machining.

Therefore, in the present invention, there is provided a support means for supporting a shaft into which a rolling bearing is fitted, a transmission wheel that is pressed against the outer circumferential surface of the outer ring of the rolling bearing and rotationally drives the outer ring, and a pusher roll that is brought into pressure contact with the outer circumferential surface of the outer ring in the deviated position, and the transmission wheel and the pusher roll are arranged so that the outer ring is oriented toward the axial center by a combined force of the pressure contact forces on the outer circumferential surface of both outer rings. A device for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft is configured such that the outer circumferential surface of the outer ring is ground by applying pressure in one direction, and grinding the outer circumferential surface of the outer ring by bringing a grinding wheel into contact with the outer circumferential surface of the outer ring from the urging direction. It is.

Effects According to the present invention, the outer circumferential surface of the outer ring is ground offline without disassembling the shaft-equipped rolling bearing.
The transmission wheel and pusher roll bias the outer ring in one direction toward the shaft center and drive it to rotate, so there is no radial clearance between the inner and outer ring raceway surfaces and rolling elements such as rollers interposed between them. In the bent position, the grinding wheel can be brought into contact with the outer circumferential surface of the outer ring, and the grinding reference is substantially set at the center of the shaft in which the rolling bearing is fitted, and the grinding is performed.

Embodiment FIGS. 1 and 2 are a front view and a side view of an embodiment, and FIG. 3 is an explanatory diagram of the grinding action.

In the rolling bearing 10 with a shaft, for example, the inner ring 2 is fixed to the shaft 1 as shown in the figure, or the shaft and the inner ring are integrated, and the inner ring raceway surface 2a and the raceway surface 3 of the outer ring 3
A large number of rolling elements 4 such as rollers are installed between the bearing and the bearing with a radial clearance necessary for rotation of the bearing.

On the grinding machine body 11, there are a center headstock 13 and a tailstock 14 at both ends thereof, and a center headstock 14.
Slide bed 1 is placed on main body 1 between 3 and tailstock 14.
The center headstock 13 and the slide bed 12 are slidably mounted on the main body 1, and the tailstock 14 is fixedly mounted on the main body 1. The centers 15 and 16 of the center headstock 13 and tailstock 14 are engaged with center holes (not shown) provided on both end faces of the shaft 1 of the rolling bearing 10 with a shaft, so that the shaft 1 is supported and fixed horizontally. be done.

Transmission wheel 17 whose outer periphery is covered with an elastic material such as rubber
is pressed against the top U of the outer circumferential surface 3b of the outer ring 3 from above, and is driven by a drive mechanism to be described later, so that the outer ring 3
Rotate.

Further, from diagonally below the front surface of the outer ring 3, a pusher roll 18 covered with an elastic material such as rubber is pressed against the outer circumferential surface 3b of the outer ring.
The outer ring 3 is supported via the shaft 1 and is rotationally driven by a transmission wheel 17. In addition, the front part of the outer ring 3 in this invention refers to the outer ring half part on the grinding wheel 19 side divided by the diameter line passing the top and bottom of the outer peripheral surface 3b of the outer ring 3.

In this way, the outer ring 3 is urged in one direction toward the center of the shaft 1 by the combined force of the pressure contact forces of the transmission wheel 17 and the pusher roll 18, and on the side on which the urging force acts, the outer ring raceway surface 2a , 3a and the rolling element 4 are pressed against each other, and the radial clearance between the surfaces 2a, 3a and the rolling element 4 becomes zero. Therefore,
At the position where this radial clearance is zero,
The grinding wheel 19 is brought into contact with the outer circumferential surface 3b of the outer ring to perform the required re-grinding process.

The transmission wheel 17 includes a V pulley 20 and a V belt 21.
It is rotatably driven by a continuously variable speed electric motor 22 via a fulcrum shaft 23, and is supported by a bearing 25 on a transmission wheel bracket 24 rotatably attached to a fulcrum shaft 23.
The fulcrum shaft 23 is pivoted on a bearing portion 27 of a transmission vehicle base 26 on which the continuously variable speed electric motor 22 is installed, and the base 26 is fixed on the slide base 12 via a height adjustment spacer 28. It is fixed on a transmission wheel frame 29. Transmission wheel base 2
A push bolt 30 is screwed onto the upper end of the push bolt 30, the tip of which contacts the driven surface of the transmission wheel bracket 24, and the bolt 30 adjusts the position of the transmission wheel 17 and the pressure contact force. .

The pusher roll 18 has its shaft portion 31 engaged in a notch 33 of a pusher roll bracket 32 provided on the slide base 12, and is rotatably supported by a bearing 34 attached to the bracket 32. A push bolt 35 screwed into the bracket 32 is provided between the bracket 32 and the bearing 34, and the bolt 35 allows adjustment of the pressing force of the pusher roll 18 against the outer circumferential surface 3b of the outer ring and adjustment of the position of the roll 18. It will be done.

The grinding wheel 19 is supported by the grinding machine main body 11 by a mechanism not shown, is rotated by a drive mechanism within the main body 11, and is moved forward and backward toward the workpiece by an operating mechanism (not shown) of the main body 11. .

The slide head 12 is mounted on the grinding machine body 11 so as to be slidable in the axial direction of both centers 15 and 16 by means of a guide part 36, and a pinion 37 provided inside the slide head 12 engages a rack 38 in the grinding machine body 11. It's meshing with each other. Pinion 37 is slide bed 1
A handle 40 is attached to the end of the operating shaft 39 exposed outside the slide bed, and allows the slide bed 12 to slide. Note that the center headstock 13 is slidably mounted on the grinding machine body 1.
Although not shown, for example, slide bed 1
It is slid by the same drive mechanism as 2.

In the present invention, the shaft 1 of the rolling bearing 10 is fixed by center support, the transmission wheel 17 and the pusher roll 18 are pressed against the outer circumferential surface 3b of the outer ring with an appropriate pressing force, and the outer ring 3 As shown in Fig. 3, at the upper part of the outer ring 3, a combined force (A) consisting of the pressing force of the transmission wheel 17 and the rotational force is applied. occurs, and the pressing force (B) of the pusher roll 18 acts on the lower front surface, and from the front surface, a combined force (C) consisting of the pressing force due to contact with the grinding wheel 19 and the rotational force is generated. As a result, the total resultant force D of these three acts on the contact point between the grinding wheel 19 and the outer ring outer peripheral surface 3b in a substantially constant direction,
Inner and outer ring raceway surfaces 2 of the rolling bearing that is the workpiece
The radial gap between a, 3a and the rolling element 4 is made zero, and as a result, highly accurate grinding processing using the shaft center as the grinding reference is possible.

Also, FIG. 4 shows another embodiment, in order to more reliably generate the resultant force (A) explained in the embodiment of FIG.
The transmission wheel 17 is shifted toward the front side of the outer ring 3 by δ, and the contact position with the outer circumferential surface 3b of the outer ring 3 is moved closer to the front side of the outer ring 3 than the top U of the outer ring outer circumferential surface 3b. be.

Note that the positions of the transmission wheel 17, pusher roll 18, and grinding wheel 19 are not necessarily limited to those in each of the above-mentioned embodiments. Any arrangement is sufficient as long as the composite force of the pressing forces of both the transmission wheel 17 and the pusher roll 18 urges the outer ring in one direction toward the axial center.

Effects According to the present invention, it is possible to omit the man-hours of disassembling and reassembling the bearing in correction grinding of the outer ring of a rolling bearing with a shaft as in the past, so that the man-hours of processing as well as the man-hours of grinding setup and cleaning can be omitted. This improves economic efficiency through a significant reduction in man-hours, maintains bearing performance before re-grinding and improves the quality of rolled products by eliminating dents and damage that occur during disassembly and assembly. In re-grinding, we achieve high precision machining based on the shaft and improve cylindricity and roundness, making it suitable not only for rolling mill back-up rolls, but also for any type of rolling bearing. It's something to adapt to.

In addition, in the embodiment, by providing a spacer between the slide bed and the transmission base, it is easy to adapt to changes in the size of the workpiece, and it is also possible to replace the push bolt with equipment such as a hydraulic cylinder. For example, it goes without saying that remote control, automatic control, etc. are possible.

[Brief explanation of drawings]

Fig. 1 is a front view of the embodiment, Fig. 2 is a side view, Fig. 3 is an enlarged side view of main parts for explaining the operation, Fig. 4 is
The figure is a diagram corresponding to FIG. 3 of another example. 1...Shaft, 3...Outer ring, 3b...Outer ring outer circumferential surface,
10... Rolling bearing with shaft, 11... Grinding machine body, 12... Slide bed, 15, 16... Center, 17... Transmission wheel, 18... Pusher roll, 19... Grinding wheel, 26... Transmission wheel Bracket for use, 29... Base for transmission vehicle, 30, 35... Push bolt, 32... Bracket for pusher roll.

Claims (1)

[Scope of Claims] 1. A support means for supporting a shaft into which a rolling bearing is fitted, a transmission wheel that is pressed against the outer circumferential surface of an outer ring of the rolling bearing and rotationally drives the outer ring, and a pusher roll that is brought into pressure contact with the outer circumferential surface of the outer ring at an deviated position, and the arrangement of the transmission wheel and the pusher roll is such that the outer ring is aligned toward the axial center by the combined force of the pressing force on the outer circumferential surface of both outer rings. It doesn't seem to be biased in the direction,
An apparatus for grinding an outer circumferential surface of an outer ring of a rolling bearing with a shaft, which grinds the outer circumferential surface of the outer ring by bringing a grinding wheel into contact with the outer circumferential surface of the outer ring from the biasing direction. 2. The apparatus for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft according to claim 1, wherein the support means is a center support device that engages with a center hole of a shaft to fix the shaft. 3. The transmission wheel is arranged to roll into contact with the outer peripheral surface of the outer ring from above the outer ring, the pusher roll is arranged so as to roll into contact with the front lower part of the outer ring from diagonally below the front face of the outer ring, and the grinding wheel is arranged so as to roll into contact with the outer peripheral surface of the outer ring from above An apparatus for grinding an outer circumferential surface of an outer ring of a rolling bearing with a shaft according to claim 1 or 2, wherein the apparatus is arranged so as to be in contact with the outer ring of a rolling bearing. 4. Claim 3, wherein the transmission wheel is arranged to roll from above the outer ring to the top of the outer circumferential surface of the outer ring.
A device for grinding the outer circumferential surface of the outer ring of a rolling bearing with a shaft as described above. 5. The apparatus for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft according to claim 3, wherein the transmission wheel is arranged to roll from above the outer ring to the front side of the outer ring from the top of the outer circumferential surface of the outer ring. 6. The apparatus for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft according to any one of claims 1 to 5, wherein the position of the transmission wheel can be adjusted. 7. Any one of claims 1 to 6, wherein the position of the pusher roll is adjustable.
A device for grinding the outer circumferential surface of an outer ring of a rolling bearing with a shaft.