JPH0618645B2 - Multi-stage rolling mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-high rolling mill having a plurality of reinforcing rolls.

<Prior Art> In recent years, in the rolling field, from the viewpoint of improving productivity and energy saving, there has been a demand for a high-pressure rolling mill capable of significantly reducing the plate thickness in one rolling step. On the other hand, there is also a strong demand for a rolling mill that can freely change the shape of the rolled sheet according to the purpose of use. As a rolling mill capable of high-pressure rolling, a multi-stage cluster type that can reduce work roll diameter to high pressure has been developed,
The multi-stage cluster rolling mill shown in FIG. 2 is of this type and has a mechanism in which the control of the plate shape can be freely changed according to the purpose of use and the operation can be easily performed during rolling. is there.

This multi-stage cluster rolling mill has a pair of upper and lower work rolls 1.
And two upper and lower intermediate rolls 2 for supporting the work rolls 1, and a plurality of reinforcing rolls 3a and 3b for vertically pressing the work rolls, which are divided into five along the axial direction and are vertically symmetrically arranged. In the rolling mill, the reinforcing rolls 3a excluding the reinforcing rolls 3b at both ends of the reinforcing rolls
Are rotatably mounted on the eccentric sleeves 5 attached to the reinforcing roll supporting shaft 4, and the sector gear 6, the rack bar 7, and the hydraulic actuator 8 for rotating the eccentric sleeve 5 support the reinforcing roll supporting shaft 4. Frame 9
It was installed in. Reference numeral 10 in the figure denotes a roll movement amount detector, and the eccentric sleeve 5 has a needle roller interposed between the outer ring and the inner ring.

In this multi-stage cluster rolling mill, since the work roll 1 can be downsized, there are advantages such as a small rolling load and high pressure. Further, when the work roll 1 is bent and deformed, the hydraulic actuator 8 is driven to rotate the eccentric sleeve 5 via the sector gear 6 and the rack bar 7, and the reinforcing roll 3 is eccentric to bend the work roll 1. There is also an advantage that can be offset.

Now, let us consider the load applied to the reinforcing rolls 3a and 3b during rolling. Figure 3 shows the linear pressure (load) acting on each reinforcing roll in the case of a rolled material with a relatively wide strip.
The outline of is shown. Assuming that the rolling pressure between the rolling mill and the work roll 1 is evenly distributed, if the rolling pressure acts on the reinforcing rolls 3a and 3b through the intermediate roll 2, as shown in FIG. 3 (b). , The load is applied most to the reinforcing roll 3a in the center, and then the reinforcing rolls 3 on both sides thereof
The load applied to a becomes large, and the load applied to the reinforcing rolls 3b at both ends becomes the smallest. This inevitably occurs due to the bending rigidity of the reinforcing roll support shaft 4, and this tendency becomes more remarkable as the plate thickness of the rolled material decreases.
In addition, the same rolling bearing is usually used for the reinforcing rolls 3a and 3b in terms of compatibility.

In the above-described multi-stage cluster rolling mill, the bearings supporting the reinforcing rolls 3a and 3b are the same even though the largest load is applied to the central reinforcing roll 3a, so that the bearing life of the central reinforcing roll 3a is the same. Is the shortest. Therefore, the maximum load of the multi-stage cluster rolling mill is set to be relatively small because the central reinforcing roll 3a is set as a reference.

Therefore, in order to eliminate this drawback, as shown in FIG. 2 (c), the center reinforcing roll 3a is made eccentric so that the bearing strength is increased, and the other reinforcing rolls 3b can be crown-adjusted so that the load capacity of the reinforcing roll 3a is increased. Has been proposed, and a multi-stage cluster rolling mill has been proposed which is also capable of controlling the shape of plate material.

<Problems to be Solved by the Invention> However, in this multi-stage cluster rolling mill, the same parts are used as the parts such as the sector lever used for the eccentric reinforcing roll 3b from the viewpoint of compatibility. Because
The rotating sector lever is provided on one side of the reinforcing roll 3b (second
It will be arranged only on the left side in the figure (c). As a result, the reinforcing roll 3b provided with the sector lever on the side of the reinforcing roll 3a that cannot be eccentrically appears, and the reinforcing roll 3a.
It is impossible to narrow the distance A between the reinforcing roll 3b and the reinforcing roll 3b. This causes the value of the load-equivalent width C determined from the roll interval A and the roll width B to be large, and results in that the reinforcing roll cannot be eccentric and the bearing strength is increased, but the pressure cannot be sufficiently high. ing. Further, since the hole of the rack bar 7 must be provided on the reinforcing roll 3a side, the bending rigidity of the frame 9 is also reduced.

The present invention has been made in view of the above circumstances, a reinforcing roll in the central portion that is eccentric and cannot be eccentric so as to withstand a high load during rolling, and a reinforcing roll that can be eccentric so that the plate shape can be easily adjusted. We provide a multi-stage rolling mill with a narrow space between
The purpose of the present invention is to reduce the load distribution of the central reinforcing roll and to enable high pressure rolling without changing the housing and chuck dimensions.

<Means and Actions for Solving Problems> A structure of the present invention for achieving the above-mentioned object is a pair of upper and lower work rolls, and a plurality of work rolls are divided along the axial direction and a plurality of work rolls are arranged vertically. In a multi-stage rolling mill having a reinforcing roll that presses the work roll through an intermediate roll, the central reinforcing roll of the divided reinforcing rolls cannot be eccentric, and the other reinforcing rolls rotate on the reinforcing roll support shaft. The eccentric sleeve is provided with a member for rotating the eccentric sleeve on the side of the reinforcing rolls other than the central portion that does not face the reinforcing rolls of the central portion, while the eccentric sleeve is rotatably mounted on the eccentric sleeve that is freely attached. The drive mechanism for the sleeve rotating member is provided on the frame that supports the reinforcing roll support shaft, and the interval between the reinforcing rolls is narrowed. This is to reduce the load sharing of the central reinforcing roll.

<Example> Fig. 1 (a) shows a partial cross-sectional front view of an upper roll group of a multi-stage cluster rolling mill according to an embodiment of the present invention, and Fig. 1 (b).
Shows a side view of a partial cross section showing the rotating mechanism, and FIG. 1 (c) shows a cross section taken along the line I--I in FIG. 1 (b). Although only the upper roll is shown in these drawings, the lower roll may be symmetrical or asymmetric with the rolled material narrowed.

In the drawing, 11 is a material to be rolled, 12 is a work roll used for rolling the rolled material 11, 13 is two intermediate rolls in contact with the work roll 12, 14 is a reinforcing roll having a small diameter, 15
Is a reinforcing roll that reinforces the work roll 12 via the intermediate roll 13, and 18 is a frame, which constitutes a rolling mill having high horizontal and vertical rigidity. The reinforcing roll 15 is divided into five pieces along the axial direction, and the central reinforcing roll 15a is the reinforcing rolls 15b, 15c on the other sides.
It is wider than that. Reinforcing rolls 15a, 15b,
The support shaft 17 of 15c is strongly attached to the frame 18, and the eccentric sleeve 1 is fixedly attached to the center of the support shaft 17.
The eccentric sleeve 20 is rotatably fitted to the eccentric sleeve 19 and the eccentric sleeve 19 is rotatably fitted to the eccentric sleeve 19 at two positions on both sides. Each is rotatably fitted. That is, the reinforcing rolls 15b,
The center of 15c is deviated from the center of the support shaft 17, and the eccentric sleeve 20 supports the support shaft 17 and the reinforcing rolls 15b and 15c.
The center positions of the reinforcing rolls 15b and 15c are also changed by rotating between and. Eccentric sleeve 1
Special rolling bearings 21 and 22 are incorporated between 9, 20 and the reinforcing rolls 15a, 15b and 15c,
The outer rings of the rolling bearings 21 and 22 are the reinforcing rolls 15.
a, 15b, 15c. Reinforcing roll 15b,
Sector levers 23 and 24, which have double ends, are attached to the eccentric sleeve 20 on the side of 15c that does not face the reinforcing roll 15a (15b is the right side and 15c is the left side in the drawing). Reinforcing rolls 15a, 15
On the upper side of b, 15c (the lower side for the lower reinforcing roll), two rack bars 25, 25a are installed in a straight line in the frame 18 so as to be movable in the axial direction in parallel with the rolling direction. A rack gear is formed on the side surface of the rack bar 25, 25a and the sector lever 2
A pin 26 that is rotatably fitted into the lid portion of 3, 24 is fixed. The drive pinion 27 and the driven pinion 27a are engaged with the rack gears of the rack bars 25, 25a.
Is supported by the frame 18, the drive pinion 27 and the driven pinion 27a are meshed with each other via the pulleys 28, 28a, and the drive pinion 27 is further connected to the rotary actuator 29. That is, the drive pinion 27 is rotated by driving the rotary actuator 29,
The driven pinion 27a is rotated in the opposite direction to the drive pinion 27 via the gears 28 and 28a, and the rotation of the drive pinion 27 and the driven pinion 27a causes the two rack bars 2 to rotate.
5, 25a move in the opposite direction, whereby the sector levers 23, 24 pivotally supported via the pin 26 and the eccentric sleeve 20 integral therewith rotate equally in the opposite direction, whereby the reinforcing roll 15b. , The center of 15c is displaced,
The reduction force acting on the intermediate roll 13 and the work roll 12 can be changed. The central eccentric sleeve 19 serves as a reference for the variable eccentric sleeve 20 and is fixed at a fixed position.

In the figure, 30 is a detector for detecting the amount of movement of the reinforcing rolls 15b and 15c. The rotary actuator 29 used for rotating the eccentric sleeve 20 is driven by a hydraulic unit having a servo mechanism for position control. Therefore, the positions of the reinforcing rolls 15b and 15c can be accurately controlled, a highly accurate plate shape can be obtained, and a rolled material having a desired plate shape can be obtained.

In the multi-stage cluster rolling machine having the above-mentioned configuration, the positions of the reinforcing rolls 15b and 15c, that is, the crowns of the intermediate roll 13 and the work roll 12 can be changed by rotating the eccentric sleeve 20. The original plate such as elongation can be finished into a flat rolled material with a good shape. Further, since the sector levers 23 and 24 for rotating the eccentric sleeve 20 are provided on the side not facing the central reinforcing roll 15a, the reinforcing rolls 15a and
The space between 5b and 15c can be narrowed, and the rolled material 11
The eccentric sleeves 20 on the inlet side and the outlet side are also rotated by moving the rack bars 24, 24a installed in a straight line, so that the rack bars 25, 25 provided on the frame 18 are rotated.
The holes for installing a may be provided by the divided number of the reinforcing rolls 15. 1 (b) and 1 (c) show one of the reinforcing rolls 15b on the inlet side and the outlet side of the rolled material 11, but a similar mechanism is provided on the other reinforcing roll 15c side. It is provided.

The above-mentioned one embodiment is applied to the multi-stage cluster type rolling mill, but it is applicable to various ones as long as it is a multi-stage rolling mill in which the reinforcing rolls for applying the pressing force to the work rolls are divided into a plurality of rolls. .

<Effects of the Invention> In the present invention, of the divided reinforcing rolls, the central reinforcing roll that receives a large load during rolling is made eccentric and the rigidity of the bearing is increased, and the other reinforcing rolls can be eccentric through the eccentric sleeve. Since the rotating member for the eccentric sleeve is provided outside the central reinforcing roll of each reinforcing roll, and the drive mechanism for the rotating member for rotating the eccentric sleeve is provided on the frame supporting the reinforcing roll supporting shaft, the reinforcing roll at the central portion is provided. It is possible to reduce the distance between the reinforcing rolls on both sides. As a result, the width corresponding to the load of the central reinforcing roll can be reduced, the load capacity can be increased, and high pressure rolling can be performed without changing the housing and chuck dimensions. Further, since the eccentric sleeve rotating member is provided outside, it is not necessary to provide a drive mechanism at the center of the frame, so that the frame can have rigidity.

[Brief description of drawings]

1 (a) is a partial sectional front view of an upper roll group of a multi-stage cluster rolling mill according to an embodiment of the present invention, FIG. 1 (b) is a partial sectional side view showing a rotating mechanism, and FIG. c) is in Fig. 1 (b)
A sectional view taken along the line I-I, FIG. 2 (a) is a schematic view of a multi-stage cluster rolling mill, FIG. 2 (b) is a sectional view taken along the axial direction of the reinforcing roll, and FIG. 2 (c) is a central portion. A cross-sectional view along the axial direction of the reinforcing rolls of a multi-stage cluster rolling mill in which the reinforcing rolls cannot be eccentric, Fig. 3 (a) is a diagram showing the outline of the linear pressure acting on the reinforcing rolls, and Fig. 3 (b) is the reinforcing It is a linear pressure distribution map which acts on a roll. In the drawing, 12 is a work roll, 13 is an intermediate roll, 15a, 15b and 15c are reinforcing rolls, 18 is a frame, 20 is an eccentric sleeve, 23 and 24 are sector levers, 25 and 25a are rack bars, 26 is a pin, 27 is a drive Pinion, 27a is a driven pinion, and 29 is a rotary actuator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Harumasa Muramoto 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works (72) Inventor Mano ▲ Susume ▼ Kawasaki-cho, Chiba-shi Chiba Prefecture Kawasaki Steel Co., Ltd. Company Chiba Steel Works

Claims (1)

[Claims] 1. A multi-stage rolling mill having a pair of upper and lower work rolls, and a plurality of reinforcing rolls which are divided into a plurality of work rolls in the axial direction and are arranged above and below to press the work rolls via intermediate rolls. , Of the divided reinforcing rolls, the central reinforcing roll is made eccentric, and the other reinforcing rolls are rotatably mounted on the eccentric sleeves rotatably attached to the reinforcing roll supporting shaft, respectively, while the other central rolls are not mounted. An eccentric sleeve rotating member is provided on the eccentric sleeve on the side of each of the reinforcing rolls that does not face the reinforcing rolls, and a drive mechanism for the eccentric sleeve rotating member is provided on the frame that supports the reinforcing roll support shaft. A multi-stage rolling mill characterized by that.