JPS63149006A - Roll oscillation device for rolling mill - Google Patents

Abstract

PURPOSE:To reduce both equipment and maintenance cost by installing a mechanical means shifting a couple of intermediate rolls in the opposite direction to each other and installing a driving hydraulic actuator and a pressure control means for the mechanical means. CONSTITUTION:An oscillation frame 9 is installed on the work side W of a reinforcing roll frame 31; a double-rod type hydraulic cylinder 8 is also installed and is fixed on a shaft 4 through boses 9a, 9b. At the time of rolling a steel strip 10, a rod 8a of the cylinder 8 is oppositely moved at a prescribed end through a sensor 8b and a controller. In that time, respective distances between the bottom ends of both link bars 2a, 2b and between the top ends of both arms 1a, 1b are changed; the arms 1a, 1b move intermediate rolls 22a, 22b together with bearing boxes in the opposite direction to each other. Both equipment and maintenance costs are reduced because a device is composed of a single hydraulic actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roll oscillation device for preventing roll mark cracks in a rolled material in a rolling mill having split reinforcing rolls such as a multi-stage cluster rolling mill.

<Prior Art> FIG. 4 shows an example of the arrangement of roll groups in a multi-stage cluster rolling mill. This rolling mill includes a work roll 21 above and below the threading surface of the strip steel 10, a pair of intermediate rolls 22a and 22b that support the work roll 21, and an axial direction of the roll that supports the pair of intermediate rolls. Divided reinforcing rolls 23, 24a, and 24b are arranged. The split reinforcing rolls 23, 24a, 24b are attached to a fixed shaft 25. '26a, 2
6b, respectively. In such a rolling mill,
During rolling, especially since the split reinforcing rolls 24a and 24b support the intermediate rolls 22a and 22b, linear or band-like roll marks are generated in the roll circumferential direction on the intermediate rolls, and these roll marks are formed on the work roll 21. There is a problem in that it is transferred to the steel strip and further transferred to the steel strip, significantly reducing the product value. Therefore, in order to solve this problem, the present applicant previously filed an application for a roll oscillation device that reciprocates the intermediate rolls 22a and 22b in the roll axis direction (
(Patent Application No. 59-91786).

Figures 5 and 6 about this roll oscillation device
As shown in the figure. As shown in both figures, the intermediate roll frame 28 is fitted on the driving side and the working side W of the housing 32,
It is held by an internal bending cylinder 33. The work roll 2 is placed inside the intermediate roll frame 28.
A pair of intermediate rolls 22a, 22 is fitted into a square hole drilled through the intermediate roll frame 28 in the roll axis direction.
Bearing boxes 27a and 27b that pivotally support both ends of b are inserted so as to be reciprocally movable. Further, a reinforcing roll frame 31 is fitted on the driving side and the working side W of the housing 32 so as to be movable up and down, and the divided reinforcing frames 23, 24a, 24b are connected to bearings via fixed shafts 25, 26a, 26b, respectively. has been done. An oscillation frame 59 is installed on the working side W of the reinforcing roll frame 31 so as to be able to move up and down, and bearings 52 and 52 are fixed to this oscillation frame 59.
L-shaped arms 51a and 51b are pivotally attached to a and 52b via shafts 54a and 54b. Arm 51
Rollers 53a and 53b are rotatably attached to one ends of a and 51b via pins 57a and 57b, and bearing covers 29a and 29b are fixed to bearing boxes 27a and 27b on the working side W.
It is inserted into the square hole of. The other ends of the arms 51a and 51b are attached to hydraulic cylinders 58a and 58b, which are fixed to an oscillation support frame 59 (pins 56a).

56b, respectively. Each hydraulic cylinder 5
8a and 58b are each controlled via a servo valve (not shown). Further, sensors (IOA) are installed at the ends of the shafts 54a and 54b.

60b is installed in each case, and the oscillation position is detected and the oscillation speed and position are controlled via a servo valve.

When rolling the steel strip 10, a drive device (not shown) on the drive side rotates the intermediate rolls 22a, 22b to roll the work roll 21 and the split reinforcing rolls 23, 24a, 2.
4b is rotated, and each divided reinforcing roll 23, 24a.

24b is set in a predetermined pattern, and the intermediate roll 22a is passed through the intermediate roll frame 28 by the bending cylinder 33.

A predetermined pending force is applied to 22b. Then, by each servo valve, the inlet hydraulic cylinder 58a and the outlet hydraulic cylinder 58b are relatively operated, and both arms 51a.

One end of each roll 53a is moved up and down alternately and rotated in opposite directions.

53b1 bearing covers 29a, 29b and bearing box 27a.

271), the intermediate roll 22n on the entry side and the intermediate roll 22b on the exit side are evenly reciprocated in mutually opposite directions in the roll axis direction to prevent the occurrence of roll marks.

At this time, the sensors 60a and 60b detect their respective positions and transmit them to a control device (not shown), and control both hydraulic cylinders 58a and 58b via servo valves to operate accurately relative to each other. Both bearing boxes 27a, 2
7b is always slid in a relative position within the square hole of the intermediate roll frame 28, and both intermediate rolls 22a, 22
b is relatively oscillated, a thrust force is generated 1/f on the work roll 21, and a moment about the bending cylinder 33 on the intermediate roll frame 28 is offset.

<Problems to be solved by the invention> However, in the conventional roll oscillation device,
Intermediate rolls 22a on the entry side and the exit side.

22b are each provided with an oscillation drive mechanism independently, so in order to relatively reciprocate both intermediate rolls accurately and at an appropriate speed, that is, in order to accurately control the position and speed, the above-mentioned conventional example Expensive servo valves and control devices were required for each of the four upper and lower hydraulic cylinders.

In addition, since a servo valve is used, minute foreign matter cannot be allowed to enter the hydraulic oil, and strict hydraulic oil management is required from manufacturing to maintenance during operation.

Means for Solving the Problems> The configuration of the present invention to solve such problems is a work roll, a pair of intermediate rolls that support the work roll,
A roll group consisting of a plurality of reinforcing rolls that support the pair of intermediate rolls and are divided in the axial direction of the rolls is installed in a rolling mill disposed above and/or below the passing surface of the material to be rolled. A roll oscillation device for reciprocating the pair of intermediate rolls in a roll axis direction, comprising: mechanical means for moving the pair of intermediate rolls in mutually opposite directions; and a hydraulic actuator for actuating the mechanical means. , and pressure control means for the hydraulic actuator.

Function> A pair of intermediate rolls can be moved relative to each other in the axial direction by driving a mechanical means by a hydraulic actuator, and the hydraulic pressure of the hydraulic actuator is controlled by a pressure control means, Adjust the oscillation speed of intermediate rolls.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that parts that are the same as those in the prior art are given the same reference numerals and redundant explanations will be omitted.

An embodiment of the present invention is shown in FIGS. 1 to 3.

As shown in the figure, an oscillation frame 9 is installed on the working side W of the reinforcing roll frame 31 so as to be movable up and down, and a double-rod type hydraulic cylinder 8 is fixedly installed on the oscillation frame 9. A fixed shaft 4 is fixed via 9a and 9b. This fixed shaft 4 has dogleg-shaped arms la on the entry side and the exit side.

1b is pivotally mounted, and a roller 3a is attached to the lower ends of the arms la and lb via pins 7a and 7b.

3b are rotatably pivotally connected to each other, and the bearing lid 29a.

They are each pushed into the square holes 29b. arm la, lb
The upper half of the pin 5a is inclined to the left and right as shown in FIG.
, 5b, and the upper end of each link par 2a, 2b is pivotally connected via a pin 6 to a fork portion 8c fixed to the lower end of a rod 8a of a hydraulic cylinder 8. It is worn. Hydraulic cylinder 8 is controlled via a proportional solenoid valve (not shown). Further, the sensor 8b is connected to the rod 8 of the hydraulic cylinder 8 via the lever 8d.
a, the stroke thereof is detected, and is connected to a control device (not shown). Incidentally, although not shown in the drawings, a device having the same configuration as that described above is also arranged below the steel strip 10 in a vertically symmetrical manner.

Intermediate roll 22a in rolling the steel strip 10.

When oscillating 22b, the rod 8a of the hydraulic cylinder 8 is reversely operated at a predetermined stroke end by the sensor 8b and the control device. That is, as shown by the two-dot chain line in FIG.
When the linkers 2a and 2b are raised, the distance between the lower ends of the links 2a and 2b and the upper ends of the arms la and lb is narrowed, and the arm 1n on the entry side rotates around the fixed shaft 4, and its lower end While moving to the work side W, the arm 1b on the exit side
rotates around the fixed shaft 4, and its lower end moves toward the drive side with the same stroke as above. Conversely, when the rod 8a and the fork portion 8c are lowered, the linkers 2a, 2b
The lower end portion and the upper end portions of the arms la and lb are spaced apart from each other, and the lower end portion of the arm 1a on the entry side moves toward the drive side, and the arm 1b on the exit side moves toward the work side W with the same stroke. Therefore, the intermediate roll 22a on the entry side and the intermediate roll 22b on the exit side have respective bearing boxes 27a, 27b and bearings M29a.

29b, 1m of entry and exit arms.

1b Same as the upper and lower ends, the drive side and work side W in the roll axis direction
in exactly the same stroke in opposite directions.

In addition, the oscillation speed of the intermediate rolls 22a and 22b changes depending on the intermediate roll pushing force, pending force, rolling blade, rolling torque, etc., so if the pressure is set using the proportional Mam valve according to these conditions, an appropriate oscillation can be achieved. It is possible to control within the speed range.

Note that the relative relationship between the intermediate roll oscillations above and below the steel strip 10 does not need to be very strict.

Next, another embodiment will be described with reference to FIG. This embodiment uses bevel gears to mechanically move the entry and exit intermediate rolls in opposite directions. That is, a shaft 15 is pivotally connected to the oscillation frame 19 via bearings 16 and 17, and a ring gear 12 is fixed to the lower end of the shaft 15, and the lower end is fixed to the oscillation thin frame 19. It is connected to a hydraulic low reactor 18. Oscillage Link Frame 19
A fixed shaft 13 is fixed to the fixed shaft 13 via bosses 14a and 14b, and the toothed portions of the arm gears lla and llb on the entry and exit sides, which are pivotally connected to the fixed shaft 13, mesh with the toothed portions of the link gear 12, respectively. There is. The arm portions of the arm gears lla and llb are connected to rollers 3a and 3b via pins 7a and 7b.
are installed, and these rollers 3a, 3b are attached to bearing covers 29a, 2
They are each pushed into the square holes 9b. The hydraulic low reactor 18 is connected to a control device (not shown) via a proportional solenoid valve (not shown), and this control device includes a shaft 15.
A sensor 18a that detects the rotation angle is connected.

Therefore, the hydraulic rotary actuator 18
When the link gears 12 are alternately rotated in opposite directions at equal angles through the link gears 5, both arm gears lla and llb are also rotated in opposite directions, so that the bearing covers 29a and 29b and the intermediate rolls 22m and 22b are rotated as described above. As in the example, they will move in opposite directions. 4 Note that the present invention is not limited to the above-mentioned embodiments, and may include split reinforcing rolls,
It is also applicable to those in which a roll group equipped with an intermediate roll is arranged only on one of the rolling surfaces of the rolled material, and to those in which one of the reinforcing rolls in the roll group is not divided in the roll axis direction. .

<Effects of the Invention> As described above in detail based on the embodiments, the roll oscillation device of the present invention reciprocates a pair of intermediate rolls in opposite directions in terms of mw using a single hydraulic actuator. Furthermore, since the oscillation speed can be controlled by pressure control means such as a proportional solenoid valve, it is possible to accurately oscillate both intermediate rolls in opposite directions with the same stroke without using expensive servo valves. It is highly economical. In addition, maintenance is easy because the hydraulic fluid can be managed to the same level as normal hydraulic fluid.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line n-I in FIG. 1, FIG. 3 is a vertical sectional view showing another embodiment of the present invention, FIG. 4 is a conceptual side view showing the arrangement of the roll group, and FIG. 5 6 is a partially cutaway side view of the conventional device, and FIG. 6 is a sectional view taken along the line ■--■ in FIG. In the drawing, la and lb are arms, 2a and 2b are linkers, 3a and 3b are rolls, 8 is a hydraulic cylinder, and lla and l.
lb is an arm gear, 12 is a link gear, 18 is a hydraulic rotary actiniator, 21 is a work roll, 22a, 2
2b is an intermediate roll, 23 is a divided reinforcing roll, 24a,
24b is a split reinforcing roll, 27a and 27b are bearing boxes,
28 is an intermediate roll frame, 29a and 29b are bearings M,
9 is an oscillation frame, 10 is a band ff4.19 is an oscillation frame. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A roll group consisting of a work roll, a pair of intermediate rolls that support the work roll, and a plurality of reinforcing rolls that support the pair of intermediate rolls and are divided in the roll axis direction is placed above the surface where the material to be rolled is passed. and a roll oscillation device that is provided in a rolling mill disposed below or on either side and that moves the pair of intermediate rolls back and forth in the roll axis direction during rolling, the pair of intermediate rolls being moved in mutually opposite directions. A roll oscillation device for a rolling mill, comprising a mechanical means, a hydraulic actuator for operating the mechanical means, and a pressure control means for the hydraulic actuator.