JPH0677767B2 - Rolling roll bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is used for grinding rolling rolls for rolling mills such as cold rolling mills and temper rolling mills, without removing the roll bearings (chicks). The present invention relates to a roll bearing device for roll grinding with a check, which is intended to perform high-precision grinding by using a roll bearing as a fulcrum by remodeling.

(Prior art) Cold rolling mill (including temper rolling mill) in iron making equipment
In order to ensure the quality of rolled material and prevent roll accidents, rolls are frequently replaced and the surface of the roll is ground.However, in the conventional roll grinding method, the chuck bearing is pulled out from the roll each time and the roll is ground. It is common to grind the body part while supporting the roll neck part (bearing part) as a single body.

In this method, it takes time to remove the chuck after rolling and to attach it after grinding, and it requires labor, which is not preferable. Therefore, as another method, for example, as introduced in Toshiba Machine Co., Ltd. catalog K0001-CED07, it has recently been adopted for a roll grinding method in a hot rolling mill. The method of grinding with the equipment installed (grinding with check) is adopted.

In this case, as shown in FIG. 4, the chucks 2 mounted on both ends of the roll 1 are supported by a lifting device 3 which is vertically movable,
The roll 1 and the chuck 2 are supported by their own weight, and the lateral load force due to the grinding load is supported by the horizontal clamp device 4.

According to this method, the accuracy of assembling the chuck bearing, which is usually adopted, and the accuracy of the bearing alone cannot satisfy the grinding accuracy of the cold rolling roll. That is, there is a gap between the roll neck and the inner ring of the bearing so that the chuck can be easily attached and detached, and a small gap is also provided between the bearing roller and the inner and outer sleeves to prevent high-speed rotation seizure. .

On the other hand, the bearing has a mechanical allowance,
For example, the allowable runout of cylindrical roller bearings specified by JIS is within 60 μm, and the allowable runout of circular roller bearings is 70 μm.
Even within m, due to the influence of the above-mentioned bearing clearance and rotation slip due to the roll neck clearance, both the cylindricity and the circularity of the grinding accuracy are deviated by about 20 μm, and the cylindricity and the circularity are both less than 10 μm. This is a problem as a rolling roll for cold rolling mills and subsequent temper rolling mills that require a deviation of.

Further, as another roll supporting means in grinding with check, the fifth
As shown in the figure, the chuck and the bearing load are supported by the self-weight supporting device 3, but the self-weight of the roll 1 supports the neck portion 5 in the vicinity of the roll cylinder by the support base 6, and the horizontal horizontal supporting device for the grinding horizontal load force. There is a method to support in 4. In this case, in order to secure a space for the supporting device on the inside of the chuck, the chuck is moved to the outside of the center of the roll, the space between the left and right bearings is expanded, and the scale of the rolling mill is increased.

Further, the processing fulcrum during roll grinding and the rolling fulcrum during rotation of the rolling mill (center of the check) will be eccentric by several tens of centimeters or more, and the rotational accuracy obtained by grinding may not be reproduced as it is during rolling. . Further, it is necessary that the roll neck portion 5 is always kept clean.

(Problems to be Solved by the Invention) The present invention provides a rolling roll bearing device capable of performing roll grinding with high accuracy when surface grinding of a rolling roll is performed by a grinding device with a chuck mounted. The purpose of this is to provide a rolling roll bearing device that can tightly fit the inner ring of the bearing and the roll neck in the bearing mounted on the neck of the rolling roll and switch the gap between the roller and the inner and outer rings according to the application. is there.

(Means for Solving Problems) Hereinafter, the present invention will be described in detail based on an embodiment with reference to FIGS. 1, 2, and 3.

FIG. 1 is a side sectional view in which a bearing is mounted on a roll neck. In the drawing, 1 is a roll, and the roll net 5
2 is attached to. The internal structure of this check will be described in detail. Reference numeral 7 denotes a bearing inner ring, which has a taper structure of about several% so as to tightly fit with the roll neck 5, and when the chuck 2 is mounted on the roll neck 5, the end face of the inner ring 7 is pushed by the hydraulic ram 13.

8 is a single outer ring on both sides of the bearing outer ring, and 9 is a central double-row outer ring. A conical roller 10 is provided between the inner ring 7 and the outer rings 8 and 9. Further, 11 is a high-rigidity special spring spacer, which serves as a mechanism that acts as a spring by the external pressure applied to the single outer rings 8 on both sides.

Reference numeral 12 is a hydraulic ram that applies a load to both outer single wheels, and 13 is a hydraulic ram that pushes the inner ring 7. 14 is a hermetic seal, 15 is a carrier ring, and 16 is a lock nut. Numeral 17 is a hydraulic hole from the end of the roll neck 5 to the inside of the inner ring 7. The bearing inner ring 7, rollers 10 and outer rings 8 and 9 function as rolling bearings when the material to be rolled is rolled by the roll 1. FIG. 2 shows the hydraulic ram 13 of FIG. 1 removed and the thrust clamp 18 installed.

Therefore, the function and purpose of the structure shown in FIGS. 1 and 2 will be described below. Normally, the chuck 2 is not detached from the roll neck 5 during rolling or grinding, but the chuck 2 may be removed by periodic inspection of the bearing or special processing of the roll surface, but after that it is mounted on the roll neck 5. In this case, as shown in Fig. 1, after mounting the chuck 2 and a set of bearings, the carrier ring 15, the hydraulic ram 13, and the lock nut.
Insert into the roll network 5 in the order 16 and set.

Next, in order to press the bearing inner ring 7 firmly to the roll neck 5, the hydraulic pressure from the external hydraulic source is introduced to the hydraulic ram 13 to strongly push the carrier ring 15 toward the inner ring 7 side. As a result, the inner ring 7 having a taper and the roll neck 5 are tightly fitted to each other so that the clearance is eliminated. After the tight fitting is completed, the lock nut 16 and the hydraulic ram 13 are removed, and the thrust clamp 18 and the lock nut 16 are mounted and fixed again as shown in FIG.

In the state shown in Fig. 2, rolling and grinding are repeated, but at this time, in order to prevent seizure of the bearing roller 10 due to high speed rolling, there is an appropriate gap between the inner and outer rings 7, 8, 9 and the roller 10. However, as described above, it is necessary to minimize the gap during grinding in terms of processing accuracy. Therefore, as shown in FIG. 2, when grinding, the hydraulic ram 12 receives the hydraulic pressure supplied from the external hydraulic device to push the single outer rings 8 on both sides, and the high rigidity special spring spacers inside them. By compressing 11, the gap between the single outer ring 8 on both sides and the roller 10 is to be minimized.

This effect partially contributes to the reduction of the clearance between the roller 10 and the inner ring 7, and the grinding with the minimum clearance is performed, so that highly accurate grinding can be obtained. When grinding is completed in this state, the hydraulic pressure of the hydraulic ram 12 is set to no load, and the single outer ring on both sides acts outward from the bearing center by the restoring force of the high-rigidity special spring spacer 11. The gap between 7, 8 and 9 and the roller 10 is set to an amount suitable for rolling.

As a result, the bearing function for the application depending on rolling and grinding is maintained, but by grinding in a tight state, the accuracy of the bearing itself greatly affects the processing accuracy, so the bearing manufacturing accuracy It is effective to use high bearings (for example, JIS4 or higher).

Furthermore, if uneven wear of the bearing or damage to the bearing occurs during long-term use, the grinding accuracy will be greatly affected. Therefore, as shown in FIG. It is necessary to keep the inside clean at all times.

Next, another embodiment in which the configuration and operation up to FIG. 2 are further developed will be described with reference to FIG.

Similar to FIG. 2, up to 15 in FIG. 3 is an example in which a special spring pedestal 19 is provided between the single outer rings 8 on both sides and the chuck 2. Generally, the gap between the outer rings 8 and 9 and the chuck 2 is about
It is necessary to secure 0.1 to 0.15 mm, and this gap also has some influence on the grinding accuracy. Therefore, if this gap can also be minimized, the entire bearing can be ground in a tight condition.

The special spring pedestal 19 shown in FIG. 3 has a central portion protruding only by an amount equal to the clearance amount between the outer rings 8 and 9 and the chuck 2 from the inner surface level of the chuck 2, and when the roll neck 5 is mounted on the chuck,
When the outer rings 8 and 9 are brought into contact with each other, they are partially pushed up by the spring force, so that the chuck 2 can be mounted. Also, when grinding, the pressure of the hydraulic ram 12 causes the single outer ring 8 on both sides to
By pressing, the special spring pedestal 19 on the side opposite to the roller 10 is pushed up as well as contacting the roller 10, and the gap is minimized by the accumulated force.

On the other hand, at the end of grinding, by releasing the hydraulic pressure of the hydraulic pressure unevenness 12, the accumulated force of the special spring pedestal 19 is also released, and the single outer rings 8 on both sides are in a play state, so that rolling is dealt with. In addition, the special spring pedestal 19 that is embedded on the inner surface side of the chassis 2
Does not need to extend over the entire length of the circumference, and the single outer ring 8 on both sides may have at least four locations on the circumference, so that the total number of locations is at least eight locations.

(Effects of the Invention) As described above, when the surface of the roll 1 was ground with the bearing of the present invention, there was almost no runout, the roundness was 10 μm, and the cylindricity was 10
It has been found that the thickness can be within μm, and no minute gloss unevenness that tends to occur on the surface does not occur, which is suitable for surface grinding of cold rolling and temper rolling rolls.

[Brief description of drawings]

1 is a side sectional view of an embodiment of the present invention, FIG. 2 is an embodiment of the present invention, a partial explanatory view of FIG. 1, and FIG. 3 is a partial explanatory view of another embodiment of the present invention. FIG. 4 is an explanatory view of support of a conventional roll bearing for roll surface grinding, and FIG. 5 is an explanatory view of another support of a conventional roll bearing for roll surface grinding. 1: Roll, 2: Check 5: Roll net, 7: Inner ring 8, 9: Outer ring, 10: Conical roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-25465 (JP, A) JP-A-53-106371 (JP, A)

Claims (1)

[Claims] Claim: What is claimed is: 1. A means for applying an axial external pressure to an outer ring for tapering a bearing inner ring of a bearing supporting a roll neck with a roll neck and adjusting a clearance between the bearing roller, the bearing inner ring and the outer ring. And a rolling roll bearing device, which is equipped with a restoring means for returning the outer ring when the external pressure is released.