JP3074948B2 - 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 in which upper and lower work rolls are crossed in a plane parallel to a rolled material to roll the rolled material.

[0002]

2. Description of the Related Art In recent years, the requirements for the thickness accuracy of a rolled product in the sheet width direction have become increasingly severe. In general, since the thickness of a hot coil is uneven in the sheet width direction, that is, a middle height is generated, a technique for controlling the thickness of a rolled material in the sheet width direction has been developed to cancel the difference.

[0003] As a sheet thickness control technique for solving the unevenness of the sheet thickness of the rolled material in the sheet width direction, recently, a method of crossing the upper and lower work rolls in a horizontal plane of the roll axis, that is, in a plane parallel to the rolled material. Rolling mills are known.

In the above-mentioned roll-cross type rolling mill, as shown in FIG. 5, an upper work roll 1 and an upper backup roll 3 and a lower work roll 2 and a lower backup roll 4 are arranged such that each axis is horizontal. A pair roll cross type rolling mill in which the upper pair rolls and the lower pair rolls are respectively arranged horizontally while being maintained, and the rolled material 5 is rolled while the axes of the upper and lower pair rolls intersect in a horizontal plane. Has been developed.
issue).

According to the above-mentioned rolling mill, by adjusting the cross angle of the upper and lower work rolls 1 and 2 to be crossed, the thickness distribution of the rolled material 5 in the width direction of the rolled material can be controlled, and the product is rolled into a product having a uniform thickness. be able to.

However, in the case of a cross rolling mill in which the above work rolls are crossed, the upper and lower work rolls receive a large thrust force in directions opposite to each other in the roll axis direction as compared with a normal rolling mill. There's a problem.

In order to solve such a problem, as disclosed in Japanese Utility Model Publication No. Sho 60-32881, a stepped portion is provided on each of the upper and lower work rolls on opposing surfaces of the chocks so that the upper and lower chocks are stepped. It has been proposed that the parts are fitted to each other to engage the chocks of the upper and lower work rolls to cancel out the thrust force acting on the upper and lower work rolls.

On the other hand, it is also known to cancel the thrust force generated in the work roll when the work roll is crossed and rolled by the thrust force generated in the backup roll. −32
It is conceivable that the chocks of the work roll and the backup roll are provided with irregularities as described in JP-A-881 to engage the chocks with each other.

[0009]

However, if the chocks of the work rolls and the backup rolls are engaged with each other by unevenness, sufficient engagement cannot be obtained due to the change in roll diameter or the thickness of the rolled material passing through the roll gap. In addition to this, when the work roll is pulled out of the housing for replacement, the backup roll is also drawn out, and the roll change is complicated and time-consuming, which may hinder production.

In view of the above, the present invention provides a method of engaging a work roll chock with a backup roll chock so that the thrust force generated on the work roll is canceled by the thrust force generated on the backup roll. In this case, only the roll can be pulled out so that the roll can be changed without any trouble.

[0011]

According to the present invention, in order to solve the above problems, upper and lower work rolls are arranged so as to cross in a horizontal plane, and the upper and lower work rolls are supported by upper and lower backup rolls. In a rolling mill having a configuration, a hole or a groove extending in a vertical direction is provided in a choke of a backup roll, and
A concave portion connected to the hole or groove is formed, and a movable connecting rod is vertically movable so as to reach from the hole or groove of the chocks of the backup roll to the concave portion of the chocks of the work roll, and the movable connecting rod is moved up and down. The configuration is such that a driving device is provided.

[0012] In addition to the bearing receiving the rolling force, the choke of the backup roll may be subjected to a thrust force generated in the work roll or the backup roll when the chocks of the work roll and the backup roll are engaged. A configuration is provided in which a radial bearing for receiving the generated moment is provided.

[0013]

During the rolling operation, when the movable connecting rod is moved and the tip is engaged with the work roll chock from within the backup roll chock, the thrust force generated in the work roll can be received by the backup roll chock. At this time, a moment is generated in the chocks of the backup roll, but by separately providing a bearing for receiving the moment, it is possible to prevent the rolling force distribution of the bearing receiving the rolling force from becoming uneven due to the above moment. Can be.

[0014]

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

FIGS. 1 and 2 show an embodiment of the present invention. Similar to the conventional method shown in FIG. 5, upper and lower work rolls 1 and 2 are rolled in a horizontal plane of a roll axis, that is, with a rolled material 5. The upper and lower work rolls are crossed in a parallel plane, and upper and lower backup rolls 3 and 4 are arranged outside the upper and lower work rolls 1 and 2 in parallel with the upper and lower work rolls 1 and 2 to form a pair cross system. The rolling rolls 1 and 2 support both ends of the shaft with bearings in the chocks 6 and 6a, and the backup rolls 3 and 4 support the both ends of the shaft with bearings in the chocks 7 and 7a. At least one of the chocks 7 and 7a on the working side or the driving side of the upper and lower backup rolls 3 and 4 is provided with a hole 8 penetrating in the vertical direction, and each of the chocks 6 on the upper and lower work rolls 1 and 2. A concave portion 9 is provided on a side portion of the backup roll 3 corresponding to the through hole 8 of each of the chocks 7, 7a of the backup rolls 3, 4 and each of the chocks of the upper and lower backup rolls 3, 4 is provided in the through hole 8. 7,7
a and a movable connecting rod 10 for connecting the chocks 6 and 6a of the upper and lower work rolls 1 and 2 movably.
When the movable connecting rod 10 reaches the concave portion 9 from the inside of the through hole 8, the chocks 7 and 6 and 7a and 6a are mechanically connected.

The chocks 7, 7a of the backup rolls 3, 4 are moved up and down by moving the movable connecting rod 10 up and down to engage the chocks 7, 7a of the backup roll with the chocks 6, 6a of the work roll. The cylinder 11 and the movable connecting rod 10 are connected by a connecting member 12, and the movable connecting rod 10 is moved by the expansion and contraction operation of the cylinder 11 so that the movable connecting rod 10 is moved to the work roll side. 6, 6a.

When rolling the rolled material 5 by crossing the upper and lower work rolls 1 and 2 in a plane parallel to the rolled material surface, the cylinder 11 is shortened, the movable connecting rod 10 is pushed in, and the tip end thereof is moved. The chocks 7, 7a of the backup rolls 3, 4 and the chocks 6, 6a of the work rolls 1, 2 are engaged with each other by engaging with the recesses 9 of the chocks 6, 6a on the work roll side. As a result, the thrust force acting on the upper and lower work rolls 1 and 2 in the roll axis direction during the rolling operation is canceled by the thrust force generated on the upper and lower backup rolls 3 and 4.

On the other hand, when the cylinder 11 is extended,
Since the tip of the movable connecting rod 10 is drawn into the chocks 7, 7a on the backup roll side, the edges of the chocks 7, 7a on the backup roll side and the chocks 6, 6a on the work roll side are cut off. Therefore, when replacing the work rolls 1 and 2, the movable connecting rod 10
Is detached from the recess 9 of the chocks 6, 6a on the work roll side, only the work rolls 1, 2 can be pulled out and replaced, and the roll change can be performed easily and in a short time.

FIG. 3 shows a moment generated in the chocks of the backup roll due to the thrust force generated in the work roll or the backup roll when the chocks 6, 6a on the work roll side and the chocks 7, 7a on the backup side are engaged. Therefore, it is intended to reduce fluctuations in the rolling force distribution of the radial bearing due to the above.

That is, the chock 7 of the upper backup roll 3 and the chock 6 of the upper work roll 1 are
In FIG. 3 showing an example of meshing at 0, a moment M is generated in the chock 7 of the backup roll 3 by a thrust force F generated on the work roll 1 or the backup roll 3. This moment M greatly varies the rolling force distribution of the bearing 13 receiving the rolling force RF, and becomes unevenly distributed in the bearing width direction as shown in A of FIG. is there.

In order to eliminate such a risk, another radial bearing 15 is provided outside the thrust bearing 14 at the shaft end of the backup roll 3 as a bearing for receiving the moment M, and the bearing 1 located inside the thrust bearing 14 is located inside the thrust bearing 14.
The non-uniformity of the rolling force distribution acting on No. 3 is reduced so as to be as close as possible to the uniform distribution shown by B in FIG. In FIG. 4, C is a bearing tolerance.

As described above, in addition to the bearing 13 receiving the rolling force of the backup roll 3, another bearing 15 for receiving the moment generated in the chock 7 of the backup roll 3 is provided on the outside. Since the outer bearing 15 receives the moment M generated in the chock 7 of the roll 3, the influence exerted directly on the bearing 13 can be reduced by the moment M, and the rolling force in the width direction applied to the bearing 13 by the moment M can be reduced. The degree of non-uniformity of the distribution can be reduced, and the rolling force can be received so that the rolling force distribution becomes substantially uniform. As a result, it is possible to receive a higher rolling load and extend the life of the bearing 13.

Although the case has been shown in which the chocks 7, 7a of the backup rolls 3, 4 are provided with holes 8 penetrating in the vertical direction, grooves are provided instead of the through holes 8, and the movable connecting rods 10 are provided.
May be able to move up and down using the groove as a guide.

[0024]

As described above, according to the rolling mill of the present invention, the movable connecting rod movably inserted into the hole or groove provided in the chocks of the backup roll engages with the concave portion provided in the chocks of the work roll. Then, the chocks on the backup roll side and the chocks on the work roll side are engaged with each other, and the movable connecting rod is moved by a driving device to be detached from the concave portion of the chocks on the work roll. Therefore, by engaging the backup roll chock and the work roll chock via the movable connecting rod during the rolling operation, the thrust force generated in the crossed work roll pair is received and canceled by the backup roll chock. And the movable connecting rod can be arbitrarily moved by the driving device,
Even if there is a change in the work roll diameter or a change in the thickness of the rolled material passing through the roll gap, the chocks on the backup roll side and the work roll side can be fully engaged. By detaching the movable connecting rod from the chocks of the work rolls, the work rolls can be exchanged only in a short time by separating the work rolls from the backup rolls. In addition to the bearing receiving the rolling force, the work roll or backup roll's thrust can be applied to the backup roll's choke in addition to the bearing receiving the rolling force. By providing a bearing for receiving the generated moment, the bearing receiving the rolling force The rolling force distribution of the ring can be minimized from becoming uneven due to the moment, and the bearing receiving the rolling force can receive a higher rolling force load and extend the life. An effect can also be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic front view of one side portion showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the chocks on the upper backup roll side and the chocks on the upper work roll side are engaged.

FIG. 3 is a cross-sectional view of the upper backup roll bearing when the present invention is further developed.

FIG. 4 is a diagram showing a relationship between a width of a bearing receiving a rolling force and a reaction force.

FIG. 5 is a schematic view showing an example of a conventional pair roll cloth type rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper work roll 2 Lower work roll 3 Upper backup roll 4 Lower backup roll 5 Rolled material 6, 6a Chock of upper and lower work rolls 7, 7a Chock of upper and lower backup rolls 8 Through hole 9 Recess 10 Movable connecting rod 11 Cylinder (drive unit) 13 Bearing 15 Radial bearing M Moment

Continuation of front page (56) References JP-A-57-4315 (JP, A) JP-A-50-62163 (JP, A) JP-A-60-18210 (JP, A) JP-A-61-279305 (JP) , A) Japanese Utility Model Showa 58-81001 (JP, U) Japanese Utility Model Showa 57-7602 (JP, U) Japanese Patent Publication No. 47-34589 (JP, B1) (58) Fields surveyed (Int. Cl. ⁷ , DB B21B 31/16 B21B 13/14 B21B 31/02 B21B 31/08 B21B 1/22

Claims (2)

(57) [Claims] 1. A rolling mill in which upper and lower work rolls are arranged so as to cross in a horizontal plane, and the upper and lower work rolls are supported by upper and lower backup rolls. And a recess is formed in the chocks of the work roll corresponding to the holes or grooves so that the work roll can be moved from the holes or grooves of the backup roll to reach the recesses of the work roll. A rolling mill having a structure in which a rod is provided so as to be vertically movable and a driving device for vertically moving the movable connecting rod is provided. In addition to the bearings receiving the rolling force, the chocks of the backup roll may be applied to the chocks of the backup roll by the thrust generated in the work roll or the backup roll when the chocks of the work roll and the backup roll are engaged. The rolling mill according to claim 1, further comprising a radial bearing for receiving the generated moment.