JPH0333410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a top roll balance device for a roll cross rolling mill.

When the upper roll of a rolling mill is vertically raised and lowered by a rolling device, the weight of the roll assembly consisting of the roll, the roll bearing box (hereinafter referred to as the roll chock), and the attachments of this roll chock causes the roll assembly to move up and down. Since the allowable clearances between the respective constituent members are accumulated, that is, so-called "backlash" occurs, there is a drawback that the vertical positioning accuracy of the roll is reduced. For this reason, the roll assembly is crimped to the rolling device with a force greater than the cumulative weight of the roll assembly to minimize the gap, and while the roll assembly is crimped to the rolling device, it follows the rolling device and the upper A roll balance device is used that improves positioning accuracy by raising and lowering a roll. Therefore, in the case of this type of rolling mill in which upper and lower roll groups are arranged in parallel, it is sufficient to simply raise and lower the upper roll assembly in the vertical direction by means of a cylinder mounted on the upper part of the housing.

However, in the case of the "roll cross type rolling mill," which has been developed in recent years to improve the thickness accuracy of rolled products in the width direction and extend the wear life of the rolls, the roll assembly does not only move up and down, but also rolls. It rotates by a small angle in a horizontal plane with the center of the long body part as the pivot axis, and has the function of having the upper and lower rolls cross each other (alternately). This rotation causes relative slippage at the contact surface between the roll chock and the hanger beam of the roll balance device that supports the roll chock, and this sliding movement occurs on the contact surface on which the roll balance force is directly acting. This has the disadvantage of causing abrasion damage and preventing smooth horizontal rotation of the roll.

As a result, as shown in FIGS. 1 and 2, a roll balancing device that can be applied to a cross-roll rolling mill has been proposed, and the accuracy of positioning the rolls in the vertical direction has been improved. In FIG. 1, a pair of guide frames 9 fixed to the top and bottom of the top separator 2 of the housing support a rotating guide 10 with a clamp 12 via a liner 11. The guide frame 9 and the clamp 12 restrain the rotating guide 10 from moving up and down in the vertical direction, but are mounted so that the rotating guide 10 can freely rotate along the contact surface of the liner 11 in a horizontal plane. Further, a pair of left and right hanger bars 5 are inserted into the rotation guide 10 and are configured to lightly restrict the position of the bars 5 in the horizontal plane, but to be able to move up and down smoothly along the bushes 13 of the rotation guide 10 in the vertical direction. ing. Therefore, the upper roll assembly follows the up and down movement of the piston rod 3 of the roll balance cylinder when moving up and down.
As shown in FIG. 2, during roll crossing, it rotates within a horizontal plane. At this time, the upper roll chock 8 and the hanger beam 6 maintain contact and transmit horizontal rotational motion to the hanger bar 5 and rotation guide 10.
This results in smooth rotation between the rotation guide 10 and the liner 11. Although the engaging portion of the pedestal 4 and the piston rod 3 of the cylinder 1 are not shown in the drawings, they abut on a spherical seat, so that they can freely respond to tilting of the roll assembly in a horizontal plane. However, the above-described apparatus has a disadvantage that the structure is complicated and the equipment cost is high because a pair of upper and lower fixed frames and a rotation guide are attached.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide an inexpensive roll balance device with a simple structure.

The present invention achieves this object by providing bearings having a self-aligning function at both upper and lower ends of a pair of hanger bars disposed in a vertical direction including the roll axis at a distribution position with respect to the roll body length center, The lower end of the hanger bar is connected to a hanger beam connected to a roll chock and arranged parallel to the roll axis with a pin through the bearing, and the upper ends of the hanger bar are engaged with a pin through the bearing, It is characterized in that the piston rod of the top roll balance cylinder is rotatably connected to a pin perpendicular to the pin in the horizontal direction via a support rod attached to the pin. An embodiment of the present invention will now be described with reference to FIGS. 3 and 4. Note that the same parts as in FIG. 1 are given the same reference numerals. Upper back-up roll jocks 8a, 8b existing at both ends of the roll 7 (upper back-up roll in this case) are provided with roll jocks 8a, 8 along the front and rear sides in the rolling direction A.
A pair of hanger beams 6a,
6b is installed. This hanger beam 6
At the bottom of a, 6b, there are roll yoke 8a, 8b.
Protrusions 14a, 14 that engage with the protrusions 13a, 13b to support the roll yokes 8a, 8b.
bProtrudes inward. Two pairs of beam members 15 are fixed to the backs of the hanger beams 6a and 6b at central distribution positions. This beam member 15
Pins 16a and 16b are respectively attached to the rollers 7 so as to be parallel to the axis in a vertical plane within the axis of the roll 7. The pins 16a and 16b are bearings (for example, spherical bearings) 17a and 17b that have a self-aligning function.
It is rotatably supported by the lower ends of a pair of hanger bars 18a and 18b arranged vertically through the hanger bars. At the upper ends of the hanger bars 18a, 18b, there are bearings 20a, which have a self-aligning function, and a pin 19 that is parallel to and in the same vertical plane as the pins 16a, 16b.
It is pivotally supported via 20b. A support rod 22 is rotatably inserted into the pin 19, and a horizontal pin 21 that is perpendicular to the pin 19 is installed at the lower center of the support rod 22.
is rotatably mounted. This horizontal pin 2
1 is rotatably connected to a connecting metal fitting 24 attached to a piston rod 3 of a roll balance cylinder 1 fixed to a top separator 2 of a housing 23.

In such a configuration, when the upper roll assembly consisting of the upper back-up roll 7, roll jocks 8a, 8b, etc. is moved up and down by the lowering device 25, a force that is appropriately larger than the cumulative weight of the upper roll components is applied. By pushing out the piston rod 3 of the roll balance cylinder 1, the upper back up roll yokes 8a, 8b are crimped onto the lowering device 25 via the support rod 22, hanger bars 18a, 18b and hanger beams 6a, 6b. The lowering device 2 is controlled by the control device.
5, it is possible to always eliminate "backlash" in the component parts of the roll assembly and improve the accuracy of vertical positioning of the roll. Furthermore, during roll cross rolling, the roll assembly rotates by a cross angle in a horizontal plane, but at this time, the roll jocks 8a, 8b and the hanger beams 6a, 6b
The hanger bars 18a and 18b move while in contact with each other, but the hanger bars 18a and 18b are freely tilted by the spherical seats of the upper and lower self-aligning bearings, so that the upper support pin 1
9 and the lower support pins 16a, 16b can be absorbed.

Specifically, for example, in the case of a large-sized actual roll cross type hot rolling mill, the hanger bar 18
The inclination angles of a and 18b are approximately 0.3 degrees. Therefore, a bearing with a normal spherical seat can sufficiently absorb the tilt angle.

Since the hanger bars 18a and 18b are connected by pins 19 and 21 that are perpendicular to each other, it is possible to smoothly follow the inclination of the upper roll assembly with respect to the horizontal plane.

As is clear from the above description, according to the present invention,
Compared to the conventional structure, the structure is extremely simple and equipment costs are low, and since commercially available standard parts can be used for the rotating parts, maintenance is easy and maintenance costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional example of a conventional roll balance device, FIG. 2 is a structural diagram of a roll assembly for explaining roll cross, and FIGS. 3 and 4 are top roll balance devices according to the present invention. FIG. 3 is a configuration diagram shown along the rolling direction, and FIG. 4 is a configuration diagram shown along the direction perpendicular to the rolling direction.
- It is a block diagram seen from the A line. In the drawing, 1 is a cylinder, 3 is a piston rod,
6a, 6b are hanger beams, 7 is a roll, 8
a, 8b are roll chokes, 16a, 16b, 1
9, 21 are pins, 17a, 17b, 20a, 20
b is a bearing, 18a, 18b are hanger bars, 22
is the support rod.

Claims (1)

[Claims] 1. Bearings with a self-aligning function are provided at both upper and lower ends of a pair of hanger bars arranged vertically including the roll axis at distribution positions relative to the center of the roll body length, and the lower ends of the hanger bars are connected to the roll chock. The upper ends of the hanger bars are connected by pins to the hanger beams arranged parallel to the roll axis, and the upper ends of the hanger bars are connected by pins to the bearings. A top roll balance device for a roll cross rolling mill, characterized in that a piston rod of a top roll balance cylinder is rotatably connected to a pin that is orthogonal to the pin in the horizontal direction.