JPH05245517A - Driving force transmission for rolling mill - Google Patents

Abstract

PURPOSE:To prevent an increase of mill hysteresis of rolling mill which thickness is controlled by changing roll gap between work rolls. CONSTITUTION:Intermediate bearings 24a, 24b which can be movably and selectively fixed in the direction along which roll gap is variable are provided in a bearing box 23 which are provided between work rolls 2, 3 and a driving force generator 27, and movable shafts 25a, 25b which are supported with the intermediate bearings and each of motor shafts 28a, 28b of the driving force generator are mutually connected with connecting shafts 26a, 26b on the motor side through universal joints 22. Each movable shaft is moved by connecting the movable shafts to the work rolls while synchronizing with change of interval between both work rolls. Then, the component of a force in the orthogonal direction to the direction of the axial line that is generated in the case that the connecting shafts on the motor side aren't parallel can be supported with the bearing box through the intermediate bearings and the hysteresis of rolling mill due to friction force that is generated by force that presses the chocks against the housing of rolling mill can be reduced as much as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission device for a rolling mill, and more particularly to a plate-shaped product or a strip-shaped product having a predetermined thickness by a pair of work rolls provided to face each other for rolling. TECHNICAL FIELD The present invention relates to a driving force transmission device of a rolling mill for manufacturing a product.

[0002]

2. Description of the Related Art Conventionally, a plate-shaped material or a band-shaped material is passed between a pair of rolling work rolls provided so as to face each other, and various rolling processes are carried out in order to manufacture a plate-shaped product or a band-shaped product having a predetermined wall thickness. Machine is being used. Further, in order to obtain a product having a desired plate thickness, the roll gap between the both work rolls is changed. In some conventional rolling mills, a drive motor and a work roll are connected via a universal joint so that the driving force from the drive motor is transmitted to the work roll. According to this structure, even if both work rolls are brought into contact with or separated from each other in order to change the roll gap, the drive torque can be easily transmitted to the work rolls.

However, the angle of the universal joint with respect to the axis of the work roll may become relatively large in accordance with the change in the roll gap, and as the angle becomes larger,
The component force in the direction orthogonal to the axis increases. That component is
The chocks supporting the shaft ends of the work rolls are pressed against the housing of the rolling mill, and the frictional force between the work rolls and the housing generated thereby promotes the mill hysteresis of the rolling mill. Further, in the structure in which the axial force generated in the work roll is received by the housing via the chock and its keeper plate, the frictional force generated between the chock and the keeper plate promotes the mill hysteresis of the rolling mill as described above. It will be. When such a frictional force is large, it is difficult to improve the plate thickness accuracy in the automatic plate thickness control.

[0004]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to control the plate thickness by changing the roll gap between the work rolls. It is an object of the present invention to provide a driving force transmission device for a rolling mill capable of preventing an increase in the rolling stock.

[0005]

According to the present invention, such an object is to provide a pair of rolling work rolls provided in a housing so as to face each other, and a driving force for rotating the work rolls. And a driving force transmission device provided between the driving force generation device and the work roll to transmit the driving force to the work roll. Is an intermediate bearing supported by a bearing box so as to be displaced and selectively fixed in synchronism with the displacement of the work rolls when changing the distance between the both work rolls, and one end of the work rolls. It has a movable shaft connected to the roll and supported by the intermediate bearing, and a connecting drive shaft connected to the other end of the movable shaft and the driving force generation device via a universal joint, respectively. Rolling mill drive It is accomplished by providing a force transmission device. In particular, it is preferable that the movable shaft supports an axial force acting in the axial direction of the work roll by the driving force from the connecting drive shaft.

[0006]

With this configuration, even if the roll gap, which is the distance between the work rolls, changes, the component force in the direction orthogonal to the axial direction, which occurs when the drive shafts of the work rolls are not parallel, is generated in the intermediate bearing. Can be supported by a bearing box through
By the component force, it is possible to prevent a force for pressing the chock supporting the shaft end portion of the work roll against the housing of the rolling mill from being generated, and to minimize the hysteresis of the rolling mill due to the frictional force generated by the pressing force. . Further, by receiving the axial force in the axial direction of the work roll by the bearing box, it is possible to avoid the generation of frictional force due to the axial restraint device of the work roll, and it is possible to further reduce the hysterinosis of the rolling mill.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic side view of a rolling mill to which the present invention is applied. In a rolling mill housing 1, a pair of rolling mills are arranged so as to face each other vertically. Work rolls 2 and 3 and reinforcing rolls 4a to 9c arranged to support the work rolls 2 and 3 and receive rolling load while being provided to the work rolls 2 and 3 are provided. And
A rolled material 10 supplied from the left side in FIG. 1 is sandwiched between both work rolls 2 and 3 and rolled.

Since the combination of the work rolls 2 and 3 and the reinforcing rolls 4a to 9c of the present rolling mill is symmetrically provided in the upper and lower roll assemblies, the upper roll assembly will be described in detail below. The upper reinforcing rolls 4a to 6c are located immediately above the work roll 2 and are located immediately above the work roll 2 as shown in combination with FIG. 2 taken along the line II-II of FIG. Central division reinforcing rolls 4a to 4d which are divided into 4 in the axial direction of 2 at equal pitch intervals.
And left and right divided reinforcing rolls 5a to 5c and 6a which are symmetrically arranged diagonally to the left and right of the work roll 2 and are divided into three so as to be located between the respective central divided reinforcing rolls 4a to 4d.
.About.6c. In this way, the reinforcing roll is divided into seven parts as a whole along the axial direction of the work roll 2.
The number of divisions is not limited to seven, but it is desirable to be an odd number in order to facilitate symmetrical control.

The work roll 2 is supported by the respective divided reinforcing rolls 4a to 6c directly above and diagonally to the left and right, and the divided reinforcing rolls 4a to 6c are freely rotatable with respect to the work roll 2. Both ends of the work roll 2 are rotatably supported by a chock 11.

Each of the divided reinforcing rolls 4a to 6c is pivotally attached to a clevis member 16 fixed to the tip of the ram 15a of the hydraulic cylinder 15. A load detection device 17 using, for example, a load cell is provided at an intermediate portion of the ram 15a, and the displacement of the ram 15a can be detected as the displacement of the split reinforcing roll between the cylinder and the base end of the ram. A displacement detector 18 is provided.

As shown in FIG. 2, the shaft ends of the work rolls 2 and 3 rotatably supported by the respective chocks 11 are respectively provided on the roll-side connecting shafts 21a and 21b and both ends thereof. Bearing box 2 via joint 22
Three movable shafts 25a and 25b are respectively connected to respective one ends. The movable shafts 25a and 25b have respective intermediate portions,
The intermediate bearings 24a and 24b provided in the bearing box 23 are supported by the intermediate bearings 24a and 24b, and the other ends of the intermediate bearings 24a and 24b are projected to the surface of the bearing box 23 opposite to the work rolls 2 and 3 side. The other ends of the movable shafts 25a and 25b and the corresponding motor shafts 28a and 28b of the driving force generator 27 are provided on the motor-side connecting shafts 26a and 26b as connecting drive shafts and on both ends thereof, respectively. They are connected to each other via the universal joint 22.

Intermediate bearings 24a.2 in the bearing housing 23
4b can be independently and displaceably and selectively fixed in the vertical direction in the drawing by a lifting device (not shown). That is, by a control device (not shown), the intermediate bearings 24a and 24b are also selectively displaced vertically in accordance with the movement of each chock 11 that is displaced to set the roll gap according to the plate thickness control value.

In controlling the vertical displacement of each of the intermediate bearings 24a and 24b, as shown in each of FIGS. 2 and 4, the change of the roll gap between both work rolls 2 and 3 is performed. Accordingly, the respective intermediate bearings 24a and 24b follow so that the axes of the respective intermediate bearings 24a and 24b corresponding to the extension lines of the axes of the work rolls 2 and 3 respectively coincide with each other. Therefore, regardless of the change in the roll gap, the work rolls 2 and 3 and the intermediate bearings 24a and 24b.
The angles of the roll-side connecting shafts 21a and 21b that connect the two with respect to the axis of the work rolls 2 and 3 are always zero.

In the rolling mill thus constructed, the motor side connecting shafts 26a.2 are connected to the respective intermediate bearings 24a.24b.
Even if 6b has a certain angle and a component force in a direction orthogonal to the axis of the work rolls 2 and 3 is generated by the driving force and the inclination angle, the component force can be received by the bearing box 23. Therefore, due to the component force, as shown in the conventional example, the chock 1
Since a force for pressing 1 against the housing 1 in the direction perpendicular to the axis is not generated, it is possible to prevent the frictional force between the work rolls 2 and 3 and the housing 1 from increasing, and suppress the hysteresis of the rolling mill.

Further, in this embodiment, the roll side connecting shaft 21a
Since 21b always exists on the axis of the work rolls 2 and 3, the distance between the chock 11 and the intermediate bearings 24a and 24b does not change, and the axial force generated in the work rolls 2 and 3 does not change. -It is possible to make it the structure supported by 24b.

By doing so, it is not necessary to fix the axial position of the chock 11 of the work roll to the housing by a keeper plate or the like, and the work roll 2
The frictional force due to the axial force of 3 can be suitably reduced. Therefore, in measuring the load of the split reinforcing rolls 4a to 6c, the influence of the frictional force on the displacement of the work rolls 2 and 3 corresponding to the load direction is small, and the load can be detected with high accuracy and without time delay. be able to. In particular, the control gain of automatic strip thickness control during rolling can be increased as much as possible.

In the rolling mill thus constructed, the load distribution acting between the work roll 2 and the divided reinforcing rolls 4a to 6c can be measured by the load detecting device for each divided reinforcing roll. As shown in Japanese Patent Application No. 3-230450 by the same applicant, the rolling load distribution acting between the rolled material 10 and the work roll 2 can be estimated from the measurement value of Furthermore, rolled material 10 after rolling
It is also possible to estimate the sheet thickness distribution in the width direction, and based on these estimated values, in order to manufacture a rolled product having a desired sheet thickness distribution and sheet shape, the control of the reduction position of each of the split reinforcing rolls 4a to 6c is performed. It can be performed quickly with high precision and hydraulic pressure. Therefore, it becomes possible to detect and control the plate crown and plate shape during rolling with high accuracy without time delay, and the control accuracy of the plate crown and plate shape of the rolled plate is dramatically improved. It is possible to achieve automation of the rolling operation work that relies on

[0019]

As described above, according to the present invention, the axis of the drive shaft is inclined with respect to the work roll by changing the distance between the work rolls during the plate thickness control, and is orthogonal to the axis of the work roll. Even if a component force in the direction of rotation is generated, the component force can be suitably received by the bearing box, and the component force can significantly reduce the frictional force generated between the chock of the work roll and the housing. Therefore, the mill hysteresis seen between the position of the rolling down device in the rolling mill and the measured value of the rolling load can be significantly reduced, and the control gain in the automatic strip thickness control can be increased as much as possible. The plate thickness accuracy can be greatly improved.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram of a main part seen along a line II-II in FIG.

FIG. 3 is a schematic plan view of an upper roll assembly of a rolling mill to which the present invention has been applied.

FIG. 4 is a diagram showing an operating procedure of a driving force transmission device for a rolling mill according to the present invention.

[Explanation of Codes] 1 Housing 2.3 Working rolls 4a to 4d Central split reinforcing rolls 5a to 5c Left split reinforcing rolls 6a to 6c Right split reinforcing rolls 7a to 7d Central split reinforcing rolls 8a to 8c Left split reinforcing rolls 9a to 9c Right split reinforcing roll 10 Rolled material 11 Chock 15 Hydraulic cylinder 15a Ram 16 Clevis member 17 Load detector 18 Displacement detector 21a ・ 21b Roll side connecting shaft 22 Universal joint 23 Bearing box 24a ・ 24b Intermediate bearing 25a ・ 25b Movable shaft 26a ・26b Motor side connecting shaft 27 Driving force generating device 28a / 28b Motor shaft

Claims (2)

[Claims] 1. A pair of rolling work rolls provided in a housing so as to face each other, a driving force generator for generating a driving force for rotating the work roll, and the working roll. A drive force transmission device provided between the drive force generation device and the work roll to transmit the drive force transmission device to the work roll, when the drive force transmission device changes the distance between the both work rolls. An intermediate bearing supported by a bearing box so as to be displaced in synchronization with the displacement of the work roll and selectively fixed, and a movable shaft having one end connected to the work roll and supported by the intermediate bearing, A driving force transmission device for a rolling mill, comprising: a coupling drive shaft coupled to the other end of the movable shaft and the driving force generation device via a universal joint, respectively. 2. The rolling according to claim 1, wherein the movable shaft is adapted to support an axial force acting in an axial direction of the work roll by a driving force from the connecting drive shaft. Drive force transmission device of machine.