JPS641205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll bearing device for a rolling mill, and more particularly to a roll bearing device for a rolling mill suitable for eliminating backlash in a bearing portion.

FIG. 1 is an explanatory diagram showing the main parts of a general metal strip rolling mill. A work roll 2 that rolls down a rolled material 1 is supported by a main bearing box 3 via a main bearing (not shown). The box 3 is guided in the rolling direction by a guide surface 6 of a project block 5 provided in the housing 4, and a roll balance cylinder 7 built in the housing 4 is connected to lift the work roll 2 and balance the roll. It's starting to bend. Further, the work roll 2 is backed up and supported by a reinforcing roll 8, and the reinforcing roll 8 is held within the housing 4 via a reinforcing roll bearing box 9.

In such a rolling mill, the main bearing box 3 of the work roll 2 and the guide surface 6 of the project block 5 are
There is a gap C1 between the two, which is determined by rolling conditions, temperature conditions, dimensions of the rolling mill, etc. This gap C1 is closely related to horizontal wobbling and deviation of the work roll 2, and if it becomes excessive, it causes various problems such as chattering during rolling and defective sheet shape.
Therefore, it is desirable to set the gap C1 as small as possible as long as it does not interfere with the vertical movement of the main bearing box 3 and the axial pulling out of the work roll 2. It is difficult to maintain proper values due to heavy wear.

Therefore, in the conventional rolling mill, a wedge 10 is interposed between the main bearing box 3 and the project block 5, as shown in FIG.
A countermeasure has been proposed in which the above-mentioned gap C1 is reduced by causing the roll to move in and out in the roll axis direction using a pressing cylinder 11 built into the project block 5.

However, in order to provide such a wedge 10 and pressing cylinder 11, a large space is required for mounting them, and if there is not enough space for mounting them, mounting becomes difficult.

FIG. 3 shows that the shaft portion 12 of the work roll 2 is connected to the inner ring 1.
3. This is an explanatory diagram showing a state in which the main bearing box 3 supports the main bearing 16 through the main bearing 16 consisting of the rollers 14 and the outer ring 15. Also in this part, there is a gap C2 between the shaft portion 12 and the inner ring 13. , a gap C3 between the main bearing box 3 and the outer ring 15, an inner ring 13, and a roller 1.
4 and the outer ring 15, and these gaps C2, C3 and C
4 also has a problem in that it has an adverse effect on the rolling operation of the rolled material.

The present invention has been made in view of the above-mentioned conventional problems, and eliminates horizontal wobbling and shifting of work rolls by means that do not require a large installation space, and prevents malfunctions during rolling. It is an object of the present invention to provide a roll bearing device for a rolling mill that can prevent the occurrence of such problems.

In order to achieve the above object, the present invention has a main bearing for pivotally supporting a rolling roll, which is built into a main bearing box, and the main bearing box is guided in the rolling direction by a guide surface of an adjacent project block through a gap. In the roll bearing device for a rolling mill, gap correction means for heating or cooling is provided in at least one of the vicinity of the gap of the main bearing box and the vicinity of the gap of the project block.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is an explanatory diagram showing the first embodiment of the roll bearing device for a rolling mill according to the present invention, and shows the main bearing box 3.
A gap correction means 21 is disposed on one side of the project block 6. As shown in FIGS. 5 and 6, this gap correction means 21 has a communication path 2 in the main bearing box 3.
2, an intake pipe 23 is connected to one opening of the communication passage 22, and an exhaust pipe 24 is connected to the other opening, so that heating fluid can be supplied to the intake pipe 23.

FIG. 7 is an explanatory diagram showing the operation control circuit of the gap correction means 21. The coil side of the differential transformer 25 is fixed to the project block 5, and the core of the differential transformer 25 is fixed to the main bearing box 3. With both sides fixed, the amount of gap change between the main bearing box 3 and the project block 5 can be detected. The output of the differential transformer 25 is transmitted to a heater 27 via a controller 26, and the heater 27 can adjust the temperature of the fluid supplied to the intake pipe 23 of the gap correction means 21.

That is, in the first embodiment, when the rolled material is rolled, the heater 27 is operated according to the output value of the differential transformer 25 to appropriately adjust the temperature of the intake pipe 23 of the gap correction means 21. Steam or hot water is supplied, passes through the communication path 22, and flows out from the exhaust pipe 24. Due to this circulation of steam or hot water, only the main bearing box 3 rapidly rises in temperature and thermally expands, resulting in a gap C between it and the project block 5.
1 is eliminated. Next, when changing the rolls, the controller 26 is manually operated by the operator.
is switched, a signal is sent to the heater 27 to cool the fluid temperature, the cooled fluid is supplied to the gap correction means 21, the main bearing box 3 is cooled and contracted, and the gap between the main bearing box 3 and the project block 5 is reduced. A predetermined gap is generated between the rolls and the rolls can be rearranged.

In the first embodiment, a case has been described in which the heating fluid is supplied to the gap correction means 21 during rolling, but the fluid may not be supplied during rolling but cooling fluid may be supplied when the rolls are reassembled. That is, the gap C1 between the main bearing box 3 and the project block 5 is set in consideration of the decrease due to the effect of thermal expansion of the main bearing box 3 due to the heat generated during rolling, and the gap C1 is set in the gap correction means 21 during rolling. The gap C1 is reduced or eliminated without supplying heating fluid, and when the rolls are reassembled after rolling, cold water is injected into the gap correction means 21 to cool and contract only the main bearing box 3, and the project block 5 and A predetermined gap C1 may be generated between the rolls to enable the rolls to be rearranged.

Furthermore, in the first embodiment, the gap correction means 21 is provided only on one side of the main bearing box 3, but the gap correction means 21 is provided on both sides of the main bearing box 3. In that case, the main bearing box 3 and the project block 5
Even if the gap C1 between the two is set large, it is possible to reduce or eliminate the gap C1 during rolling.

FIG. 8 is an explanatory view showing a second embodiment of the roll bearing device for a rolling mill according to the present invention. , a gap correction means 31 similar to that in the first embodiment is provided. According to the gap correction means 31, by heating or cooling only the project block 5, it is possible to reduce or eliminate the gap C1 between the project block 5 and the main bearing box 3. In addition, the main bearing box 3 and the project block 5
If the gap C1 between the project block 5 and the project block 5 is small, the gap correction means 31 may be provided only on one side of the project block 5.

FIG. 9 is an explanatory diagram showing a third embodiment of the roll bearing device for a rolling mill according to the present invention. In this embodiment, gap correction means 21 are provided on both sides of the main bearing box 3, and gap correction means 31 are provided on both sides of the project block 5. According to this third embodiment, by supplying heating fluid to the gap correction means 21 and cooling fluid to the gap correction means 31 during rolling, the temperature difference between the two can be maintained for a long time, and a large gap C1 can be maintained. It becomes possible to reduce or eliminate the gap C1, and a large gap C1 can be obtained when recombining the rolls.

FIG. 10 is an explanatory diagram showing a fourth embodiment of the roll bearing device for a rolling mill according to the present invention. In this embodiment, a gap correction means 4 is provided on one side of the main bearing box 3 facing the project block 5.
1 is disposed on the main bearing 16 side of the main bearing box 3 to supply heating fluid during rolling, and a gap correction means 51 is disposed on the main bearing 16 side of the main bearing box 3 to supply cooling fluid during rolling. The gap correction means 62 is disposed on the side that contacts one side of the auxiliary bearing 61 inserted through the shaft portion 12 of the work roll 2.
According to this fourth embodiment, the gap correction means 4
1 and 51, the gap C1 between the main bearing box 3 and the project block 8 is reduced or eliminated, and the gap correction means 62 causes the auxiliary bearing 61 to press the shaft portion 12 in the position direction. , gaps C2 and C3 in the above-mentioned FIG.
and C4 will be reduced or eliminated, respectively.

As described above, the roll bearing device for a rolling mill according to the present invention is provided with a gap correction means for forcibly creating a temperature difference between adjacent members forming the bearing, thereby reducing or reducing the gap in the bearing. This has the effect of eliminating wobbling or shifting of the rolling roll in the horizontal direction, and preventing the occurrence of defects during rolling.

[Brief explanation of drawings]

Figure 1 is a side view of the main parts of a general rolling mill;
The figure is a sectional view showing a conventional gap correction method, FIG. 3 is a sectional view showing a general main bearing, and FIG.
The figure shows the first roll bearing device for a rolling mill according to the present invention.
A sectional view showing the embodiment, FIG. 5 is an enlarged plan view of the main parts, FIG. 6 is a view taken along the - line in FIG. 5, and FIG. 7 is a piping system showing the operation control circuit. 8 is a sectional view showing the second embodiment, FIG. 9 is a sectional view showing the third embodiment, and FIG. 10 is a sectional view showing the fourth embodiment.
It is a sectional view showing an example. 3... Main bearing box, 5... Project block, 6... Guide surface, 16... Main bearing, 21, 3
1, 41, 51, 62... Gap correction means.

Claims (1)

[Claims] 1. A roll bearing device for a rolling mill in which a main bearing that pivotally supports a rolling roll is built into a main bearing box, and the main bearing box is guided in the rolling direction by a guide surface of an adjacent project block via a gap,
A roll bearing device for a rolling mill, characterized in that gap correction means for heating or cooling is provided in at least one of the vicinity of the gap of the main bearing box and the vicinity of the gap of the project block.