JP3025370B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill,
A pair of work rolls provided to face each other to perform rolling, and a reinforcing roll provided for each work roll to support the rolling load, a plate-shaped product or a band-shaped product having a predetermined thickness. The present invention relates to a rolling mill for manufacturing.

[0002]

2. Description of the Related Art Conventionally, various kinds of rolling have been carried out in order to produce a plate-shaped product or a band-shaped product having a predetermined thickness by passing a plate-shaped material or a band-shaped material between a pair of rolling work rolls provided opposite to each other. A typical example is a four-high rolling mill in which a work roll is used only for rolling processing and one reinforcing roll is provided for each work roll to support a rolling load. In some of such rolling mills, both ends of a work roll are rotatably supported by chock. In order to obtain a product having a desired thickness by the rolling mill, it is necessary to appropriately displace the work rolls so that the two work rolls are brought into contact with and separated from each other in order to adjust the roll gap between the two work rolls. .

[0003] In controlling the thickness of a rolled sheet, the rolling position of the reinforcing roll is controlled. When the reinforcing roll and the work roll are displaced accordingly, the chocks and a rolling mill housing or a rolling mill housing for supporting the chocks are provided. A frictional force is generated between the keeper plate provided in the housing and the rolling direction force and the axial direction force. In this way, the rolling position and the measured rolling load value are related with hysteresis, and there is a problem that it is difficult to increase the control gain of the automatic thickness control during rolling.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, a main object of the present invention is to feed a rolled material when rolling is performed by a pair of work rolls provided opposite to each other. An object of the present invention is to provide a rolling mill capable of improving the thickness accuracy in the direction.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a pair of rolling work rolls provided opposite to each other, and an outer periphery of at least one of the work rolls for supporting a rolling load. relatively rollably disposed Menjo
In rolling mill having a plurality of rolls which are, and a load detection device provided on the front Kiho strong role, the working
In addition to restraining the axial displacement of the roll,
Displacement of the work roll when making the interval between rolls variable
In order to reduce the frictional force in the
Thrust bearing machine provided between shaft end of work roll
This is achieved by providing a rolling mill characterized by having a structure . Or, a pair provided opposite to each other
Rolling work roll and a small roll to support the rolling load
At least one of the work rolls relatively rolls on the outer peripheral surface
A plurality of reinforcing rolls arranged as
A rolling mill having a load detection device
Te, a drive shaft connected to the work rolls, the axial load support device for supporting the drive shaft is provided so as to restrain axial displacement of the work rolls
This is achieved by providing a rolling mill characterized by the following.

[0006]

[Action] In this way, provided with a load <br/> heavy detection device to a reinforcing role for supporting the work rolls for a pair of rolling provided to face each other, and the axial end portion of the work roll housing To constrain the axial displacement of the work roll between
And a thrust bearing that makes the distance between both work rolls variable
By providing the mechanism, it is possible to reduce the frictional force caused by the axial force applied to the work rolls in the displacement direction of the gap between the work rolls. In addition, by receiving the axial force acting on the drive shaft connected to the work roll by the axial load supporting device that supports the drive shaft, the influence of the axial force on the work roll can be prevented. Therefore, the accuracy and responsiveness of load detection by the load detecting device provided for each reinforcing roll can be improved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a schematic side view of a rolling mill to which the present invention is applied. In a housing 1 of the present rolling mill, a pair of vertically arranged rolls are arranged so as to face each other for rolling. In order to receive the rolling load while supporting the work rolls 2, 3 and the respective work rolls 2, 3, the upper work rolls 2 are supported.
The reinforcing rolls 4 and 5 and the reinforcing roll 6 that supports the lower work roll 3 are provided. Then, a rolled material 10 supplied from the left side in FIG. 1 is sandwiched between the two work rolls 2 and 3 so as to be rolled.

As shown in FIG. 2 as viewed along the line II-II in FIG. 1, in the upper roll assembly, the work roll 2 is supported by two reinforcing rolls 4.5. The reinforcing rolls 4 and 5 can roll freely with respect to the work roll 2. Both work rolls 2 and 3 are rotatably supported on both shaft ends by chock 11 respectively. Each chock 11 is integrally provided with a thrust receiving roller 12 for receiving the axial force of the work rolls 2 and 3.
The corresponding rollers 12 are brought into contact with keeper plates 13 provided at both ends in the three axial directions. Thus, a thrust bearing mechanism is configured.

Each of the reinforcing rolls 4 and 5 has both ends rotatably supported by a chock 16 (see FIG. 2). Each chock 16 is supported by the housing 1 via a load detecting device 17a / 17b using a load cell for each reinforcing roll 4.5. In addition, each reinforcing roll 4
Thrust receiving roller 12 for receiving an axial force of 5
A keeper plate 13 is provided in the same manner as described above.

The lower roll assembly may have the same structure as a normal four-high rolling mill. As shown in FIG. 1, the lower work roll 3 has a single relatively large diameter. It is supported by a reinforcing roll 6. A support block 21 for supporting the reinforcing roll 6 is fixed to the tip of a ram 22a of a hydraulic cylinder 22 similar to the above. Further, a load detecting device 23 using a load cell is provided at an intermediate portion of the ram 22a in the same manner as described above.

In the rolling mill constructed as described above, the load detecting devices 17a, 17b, 2 for each of the reinforcing rolls 4 to 6 are provided.
3, the loads acting between the work roll 2 and the reinforcement rolls 4 and 5 and between the work roll 3 and the reinforcement roll 23 can be measured, and the measured values act on the rolled material 10. The rolling load can be detected. At this time, a force in the rolling direction due to the feed acts on the work roll 2 in the feed direction of the rolled material 10. In the present embodiment, two reinforcing rolls 4 and 5 are arranged in the feed direction. Therefore, the force in the feed direction can be suitably received by the two reinforcing rolls 4 and 5. Therefore, the influence on the load detection due to the force in the rolling direction can be eliminated, and the accuracy of the load measurement by the load detection devices 17a and 17b of the two reinforcing rolls 4 and 5 can be suitably improved.

Since the detected load value thus measured has a very small error with the load actually acting on the rolled material, the control gain of the automatic thickness control during rolling can be extremely increased. Significant improvement in plate thickness accuracy is possible.

In this embodiment, the load of the work rolls 2 and 3 in the axial direction is received by the keeper plate 13 via the thrust receiving rollers 12 provided on the chock 11. (3) The frictional force against the keeper plate 13, that is, the housing 1 caused by the three axial forces can be reduced as much as possible, and the load detection accuracy can be improved.

As shown in FIG. 3, a hydrostatic bearing 31 may be used instead of the thrust receiving roller 12 of the above embodiment. The hydrostatic bearing 31 includes an oil chamber 32 formed on the keeper plate 13 side of the chock 11 and an oil passage 33 piped from a hydraulic source (not shown) for supplying high-pressure lubricating oil to the oil chamber 32, for example. It is configured to have.
The oil passage 33 is supplied with high-pressure oil from a hydraulic pressure source.
A high-pressure oil layer is formed between the chock 11 and the keeper plate 13. In the second embodiment, the work roll 2
3) The axial force of 3 can be received by the hydrostatic bearing 31, and the frictional force at the time of the vertical displacement of the work roll as in the above embodiment can be suitably reduced. Therefore, the same effect as the above embodiment can be obtained.

Also, as shown in FIG.
The shaft ends of the work rolls 2 and 3 rotatably supported by the first and first ends of the roll-side connecting shafts 41a and 41b are connected via universal joints 42, respectively.
The other end of each of the intermediate bearings 44a and 44b provided in the bearing box 43 via the universal joint 42,
It may be connected to one end of each of the movable shafts 45a and 45b supported for each b. One end of each of the corresponding motor-side connecting shafts 46a and 46b is connected to the other end of each of the movable shafts 45a and 45b via the universal joint 42, and the other end of each of the motor-side connecting shafts 46a and 46b is The motor shafts 48a and 48b of the driving force generator 47 are respectively connected via the universal joints 42.
Is linked to

In this case, the intermediate bearings 44a and 44b are always connected to the connecting shafts 41a and 41b by a position control device (not shown) in accordance with the downward movement of the work rolls 2.3.
Are controlled so as to exist on the axis of the work rolls 2 and 3, and the axial force acting on the work rolls is supported by the bearing box 43 via the intermediate bearings 44a and 44b. It is not necessary for the housing to receive the axial force acting on the work rolls 2 and 3, so that the frictional force caused by the axial force does not disturb the measured rolling load. Therefore, the mill hysteresis can be greatly reduced, and in particular, the control gain of the automatic thickness control during rolling can be increased as much as possible. In addition to the effect of the two reinforcing rolls 4 and 5, Accuracy can be greatly improved.

In this embodiment, two reinforcing rolls 4
Although the example in which 5 is provided has been described, the number of reinforcing rolls is not limited to two, and may be at least two, and the plurality of rolls may receive a load in the feed direction of the rolled material 10. Good.

[0019]

As described above, according to the present invention, the work roll
Between the work roll and the housing.
Low frictional force when working rolls are displaced vertically
It provided a thrust bearing mechanism for reducing, or to minimize the frictional force by the force acting in the axial direction of the work roll
And provided on the reinforcing roll that supports the rolling load of the work roll
Ru can be performed load detection by the load detection device more accurately. Also, by providing a mechanism for receiving the axial force on the drive shaft of the work roll, the mill hysteresis can be greatly reduced, so that the control gain of the automatic thickness control can be increased as much as possible, and the feed of the rolled material can be performed. The thickness accuracy in the direction can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a rolling mill to which the present invention is applied.

FIG. 2 is a schematic diagram of a main part viewed along line II-II in FIG. 1;

FIG. 3 is an enlarged view of a main part corresponding to FIG. 2 showing a second embodiment.

FIG. 4 is a schematic diagram of a main part showing a driving force transmission unit according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2.3 Work roll 4-6 Reinforcement roll 10 Rolled material 11 Chock 12 Thrust receiving roller 13 Keeper plate 16 Chock 17a / 17b Load detector 21 Support block 22 Hydraulic cylinder 22a Ram 23 Load detector 31 Static pressure bearing 32 Oil chamber 33 Oil passage 41a / 41b Roll side connection shaft 42 Universal joint 43 Bearing box 44a / 44b Intermediate bearing 45a / 45b Movable shaft 46a / 46b Motor side connection shaft 47 Driving force generator 48a / 48b Motor shaft

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-174905 (JP, A) JP-A-5-154506 (JP, A) JP-A-5-154507 (JP, A) JP-A-5-154507 50109 (JP, A) JP-A-5-69010 (JP, A) JP-A-5-123709 (JP, A) JP-A-5-123711 (JP, A) JP-A-58-53314 (JP, A) JP-A-4-274804 (JP, A) JP-A-63-252608 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 13/14 B21B 29/00 B21B 31/07 B21C 51/00

Claims (2)

(57) [Claims] 1. A facing to the work rolls for a pair of rolling provided together on the outer peripheral surface of at least one of said work rolls to support the rolling load relatively rollably
And a plurality of rolls disposed in front Kiho strong rolling mill and a load detection device which kicked set <br/> to roll, while restraining the axial displacement of the work rolls, before
The work roll for making the interval between the work rolls variable.
Housing to reduce the frictional force in the
Thrust provided between the shaft and the shaft end of the work roll
A rolling mill having a bearing mechanism . 2. A pair of rolls provided opposite to each other
Working rolls and at least to support the rolling load
Rolling relatively on the outer peripheral surface of one of the work rolls
A plurality of reinforcing rolls arranged, and
And a drive shaft connected to the work roll , wherein the work load
The drive shaft so that the axial displacement of the
The rolling mill according to claim 1, further comprising an axial load supporting device for supporting the rolling machine.