JPS6082206A - Multistage rolling mill - Google Patents

Abstract

PURPOSE:To diversify the power to control shape by parting axially an intermediate roll, making the parted rolls respectively inclinable with the axial line of work rolls and horizontally movable in the direction orthogonal with said axial line and acting bending force in the direction perpendicular to both ends of the work rolls. CONSTITUTION:Upper and lower backup rolls 13, 14 are respectively disposed to upper and lower work rolls 11, 12 and an intermediate roll 15 is interposed between the upper work roll 11 and the backup roll 13 in press contact therewith. The roll 15 is parted axially at the center to two symmetrical split rolls 15a, 15b which are made freely adjustable in angles alpha1, alpha2 of inclination at a parting point S. Said roll is made horizontally movable in the directions A, B orthogonal with the axial line L of the upper work roll 11. A means for acting perpendicular bending force in the arrow C direction to both ends of the work rolls 11, 12 is provided. The control with a large degree of freedom is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to a multi-high rolling mill in which an intermediate roll is interposed between a work roll and a backup roll.

In recent years, the requirements for the shape accuracy of rolled products, especially the thickness accuracy in the width direction, have become increasingly strict. .

The present invention provides such plate thickness control (in a rolling mill with multiple layers, an intermediate roll is disposed between a work roll and a backup roll, and the plate thickness side 911 is performed using this intermediate "J-ru"). This relates to multi-stage rolling formation.

Conventionally, the following two types of multi-high rolling mills have been developed: f and L.

- A type in which the intermediate roll is bent horizontally - A type in which the intermediate roll is crossed horizontally with respect to the axis of the work roll.

Therefore, these two types of rolling mills will be briefly explained with reference to FIGS. 1 to 3.

J3, for example, is a five-high rolling mill (not shown in Fig. 1). In this figure, 1 and 2 are work rolls arranged above and below to sandwich the rolled plate P. A backup roll 4 is in pressure contact with the top of the upper work roll 1 via an intermediate roll 3, and a backup roll 5 is in pressure contact with the bottom of the lower work roll 2.

First, the rolling material of the type (2) is pressed against the approximate center of the intermediate roll 3 whose both ends are supported by bearings (the rolling roll 6 is immediately pressed from the horizontal direction), as shown in Fig. 2. (d G), thereby bending the intermediate roll 3 in the horizontal direction, and adjusting the deflection of the work roll 1 by J3 in the length direction, using the displacement of the intermediate roll 3 at that time as a vertical displacement, and creating a crown on the work roll 1. This is to control the plate thickness of the rolled material P with the same effect as when using the same method.

In addition, in the rolling mill of the type (■) above, the intermediate roll 3 is td+t! of the work roll 1. It is tilted in the horizontal direction with respect to A, and the axis of the work roll 1 and the axis of the intermediate roll 3 are crossed, thereby producing the same effect as adding a crown to the work roll 1 in the same way as in the case of ① above. In addition, the thickness of the rolled material P is controlled.

By the way, although the above-mentioned conventional rolling method can exhibit sheet thickness control ability to a certain extent, it has not yet reached the point where it can fully satisfy current requirements.

In the case of the rolling mill (■), there is a limit to the ability to bend the roll due to the problem with the bullet hole J3 in the intermediate roll 3 and problems with the bearing mechanism, which naturally limits the ability to control the plate thickness. It was. In particular, when the width of the rolled material [] is narrower than the length of the roll, the bending action can sufficiently reach the central part (the central part in the longitudinal direction of the roll axis) where it is most needed. This resulted in a further decline in the ability to control plate thickness.

In addition, in the case of the rolling mill (2), by cross-rolling the intermediate rolls 3, a relative thrust force along the axial direction is generated in each roll that contacts each other. This thrust force causes slippage on the roll surface, promotes wear on the roll surface, reduces roll life, and puts extra load on the bearings of the work roll and backup roll. Since the thrust force generated in the intermediate roll is canceled out by the thrust force generated in the vertical direction in the opposite direction, this is not a problem here. For this reason, there was a natural limit to the angle at which the cross could be avoided, and therefore there was also a limit to the ability to control the plate thickness.

In view of the above circumstances, the present invention has been developed to improve the intermediate roll itself and the operating principle of the intermediate roll, thereby exhibiting a much more convenient shape control function than the conventional multi-high rolling mill.
This was accomplished in order to provide a multi-high rolling mill.

A feature of the present invention is that the intermediate roll is divided in the axial direction into a plurality of divided rolls. Adjust the inclination angle of the roll! A shift mechanism is provided for horizontally moving the intermediate roll consisting of the divided rolls in a direction substantially perpendicular to the @ line of the work roll, and further a vertical pending force is applied to both ends of the work roll. The point is that a bending means is provided to act.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 14.

First, the basic concept of the rolling mill of the embodiment will be explained with reference to FIGS. 4 to 9. As shown in the side view in Fig. 4, this rolling mill has work rolls 11 and 12 arranged above and below, and backup rolls 13 and 14 arranged above and below them.
An intermediate roll 15 is interposed between the upper work roll 11 and the upper back-up roll 13 and is in pressure contact with both rolls 11 and 13. In this case, the upper work roll 11 has a smaller diameter than the lower work roll 12.

The intermediate roll 15, as shown in FIGS. 5 and 6,
Two symmetrical split rolls 1 separated at the center in the axial direction
It is divided into 5a and 15b, and can be bent freely at its branch point S. That is, each divided roll 15a,
1511 is configured to be inclined in a horizontal plane with respect to the axis of the work roll 11.

In this rolling mill, these divided rolls 15
The structure is such that the inclination angles mar and α2 of the divided L1-rules 15a and 151 can be freely adjusted. There is.

Further, the intermediate roll 15 consisting of the split rolls 15a and 15b is provided so as to be horizontally movable in directions perpendicular to the axis of the work roll 11, that is, in the rolling direction A-B. Mechanism (not shown here)
It is designed so that it can be shifted so that the amount of movement can be adjusted.

Furthermore, this rolling mill includes soak rolls 11 and 12.
Bending means (not shown) to avoid applying a vertical pending force as indicated by arrow C in Fig. 5 to both ends of the
is set up.

In the rolling mill having the above configuration, the intermediate roll 15
Basically, the operation control patterns shown in Figures 7 to 9 are as follows.
4 as shown in the figure is possible, and plate thickness control may be performed by appropriately combining these operation patterns.

Therefore, the pattern will be explained.

First, what is shown in FIG. 7 is the parting point S of the intermediate roll 15.
The position of work roll 11! This is a case where the divided rolls 15a and 15b are set on the same vertical plane as the l'llll line, and each of the divided rolls 15a and 15b is tilted by a tilting means. Among these are (a)
Split roll 15a as shown.

151) to tilt at the same angle, that is, α1-α2, (b) split roll 1.5a as shown in the figure.
.

In the case shown in FIG. 8, the position of the dividing point S is set to be shifted in the horizontal direction perpendicular to the axis of the work roll 11, and the divided roll 15a, as in the case shown in FIG. 1
This is a case where the tilt control of 5b is performed. This includes (d) shifting the work roll 11 forward as shown in the figure, and (d) shifting the work roll 11 forward as shown in the figure.
e) It may be moved backwards as shown in the figure.

Moreover, 1JtJ shown in FIG. 9 is a divided roll 15a.

15b is not particularly controlled, the angle is fixed at a certain set angle, and the intermediate roll 15 is horizontally moved in the axial direction of the work roll 11 by shifting 1 to (41°4). In this case, Control the shift amount δ.

In actual rolling, the above control patterns may be combined. The rolled material P is rolled by rotating each roll as shown in FIG. 4 while applying a rolling reduction as indicated by the arrow in FIG. 5.

At that time, the above-mentioned inclination angle, shift amount, and bending 4 of the work rolls 11' and 12 are appropriately adjusted according to the rolling conditions, and rolling is performed while controlling the plate thickness.

Therefore, it is possible to provide diversity in control contents,
Appropriate plate thickness control that better matches the pressing condition f] becomes possible.

In addition, since the intermediate roll 15 can be rapidly bent and deformed at the dividing point S, the conventional benzo ink method, which cannot bend the intermediate roll slowly, can
This allows for more sensitive and accurate control. This means that
It is particularly effective when rolling narrow material. However, when rolling a material with a narrow width, a small part of the central part in the axial direction of the roll is rolled, but in this case, the deformation of the intermediate roll is concentrated in the middle heating part. This makes it possible to perform extremely effective control.

Furthermore, as shown in FIGS. 7(a), 8(d), (e), and 9(f), both split rolls 15a.

15b inclination angle α1. If α2 is controlled to be equal, the thrust forces generated in the work roll 11J3 and the backup roll 13 cancel each other out on the left and right sides (in the top and bottom in the figure), making it possible to achieve a state in which no thrust force is generated as a whole. Therefore, it is possible to prevent extra load from being applied to those bearings. Therefore, it is possible to give a larger inclination than the conventional cross type, and the plate thickness control ability can be improved. .

In addition, since the intermediate roll 15 itself has a structure that allows easy bending control, unlike the conventional bending method,
It is easy to deform, there is no need to reduce the diameter to cover it, and it is intermediate 1.
- The rod 15 itself can be made to have a large diameter. therefore,
It has no significant advantage in terms of surface pressure strength17, and can also be applied to high-load mills for high-pressure rolling.

Also, shown in Figure 8 (e) and Figure 9 (f)? JJ, sea urchin, the split rolls 1'5a, 15b are tilted in the same direction μ,
Moreover, by controlling the bending point S to move backward, the cross points C of the intermediate roll 15 can be made at three locations in one line of the work roll Il, and the left and right balance can be maintained well. It is also possible to keep it.

Next, we will explain the basic concepts mentioned above in concrete form! An embodiment with the A position will be described with reference to FIGS. 10 to 13.

In this rolling process, the intermediate roll 15 is constructed by combining two divided rolls 15a and 15b as shown in FIG. A convex portion is formed on the western side of each side, and by fitting these slightly loosely, it is possible to prevent deviation in the radial direction.
is formed into a spherical shape so that the intermediate E1-rule 15 can be easily bent at that portion. d3.Actually, when it is bent, there will be a gap at the divided part, but it will be small and will not cause any problem.

In addition, in this rolling process, the split roll 15a.

A pressing angle (a flow 16, a pressing roll 17, and a cylinder 18 are provided as the tilting means of the shifter 15a.
There are shift screws 19 provided at various locations for the shifting mechanism. In actual use, this shift mechanism can also function as a tilting means.

With this configuration, the intermediate roll 15 is connected to the work roll 11 and the backup roll 13 as shown in FIG.
12 and tilted as shown in FIG. 13 by a mechanism or tilting means. I sip it when I get it.

The actual control method is as described in the explanation of the basic concept, and by controlling in this way, it is possible to obtain a product with a uniform plate thickness.

In the above example, the case where the intermediate roll 15 is divided into two in the axial direction is described, but as shown in FIG. 14, the intermediate roll 15' is divided into three in the axial direction. three divided rolls I J) ' a + 1 J ' b,
It may be divided into 15c, or it may be divided into even more parts. In that case, in principle, the dividing points can be provided at any position in the axial direction, but it is desirable to gather them in the center according to the actual rolling conditions.

Further, in the above embodiment, a case is shown in which the intermediate roll 15 is divided symmetrically, but it is not necessarily necessary to divide it symmetrically.

Further, in the above embodiment, both the divided rolls are connected at the dividing point, but they may be separated slightly.

Further, in the above embodiment, the case where both the divided rolls can be tilted is shown, but it is also possible to have one fixed and only the other tilted.

Furthermore, in the above embodiment, the case where the intermediate roll is between the upper work roll and the backup roll is shown, but when it is between the lower work roll and the backup roll,
Also, bI//J argument is good if it is on both the upper and lower sides.

Further, in the above embodiment, the upper and lower workpieces 1] are configured to have different diameters, but it is of course better to have the same diameter (.b).

Furthermore, in the present invention, at least one of the divided rolls may be configured to be tiltable with respect to the axis of the work roll in a plane different from that of the other rolls.

As explained above, the multi-high rolling mill of the present invention has J:
This is done by dividing the middle roll in the axial direction and dividing it into a plurality of divided rolls, so that at least one of the divided rolls is inclined in a horizontal plane with respect to the work roll line. Because of this structure, the intermediate roll can be changed into various forms depending on how the split rolls are controlled, making it possible to perform a variety of 2T control. By tilting, it is possible to prevent the overall thrust force from being generated on the work rolls and the back-up roll, and it is possible to prevent unnecessary loads from being placed on their bearings. Therefore, by doing so, it becomes possible to provide a larger inclination than that of the conventional cross method, and the ability of the shape control 211 can be improved.

In addition, since the intermediate roll can be rapidly bent and deformed at the axial separation point, it is more effective than the conventional bending method in which the intermediate roll can only be bent slowly.
Sharp and accurate il+lJ till is possible. Therefore, it is extremely right-handed, especially when rolling material with a narrow width relative to the length of the roll.

In addition, since the intermediate roll can be deformed easily by dividing it, even if the diameter of the intermediate roll is increased, the ease with which it deforms will not be reduced. As a result, there is no advantage in surface pressure strength19, making it possible to apply it to high-load mills.

Further, in the present invention, since the intermediate roll consisting of the split rolls is configured to be horizontally moved in a direction perpendicular to the axis of the rework roll by the shift roller (14), the point of contact with the work roll is changed. It is possible to μ,
This allows for more flexible control.

Furthermore, in the present invention, since the work roll bending means is provided, it is possible to add the above-mentioned inclination angle control of the divided rolls, shift control + of the intermediate rolls, and bending control. Excellent effects such as thickness control can be achieved.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams of a conventional multi-stage pressure paper loading system. Figure 1 is a schematic side view of the entire structure, Figure 2 is a plan view of a type in which intermediate rolls are bent horizontally, and Figure 3 is a plan view similar to Figure A12 of a type in which the intermediate roll is horizontally recessed with respect to the work roll axis;
Figures 1 to 13 are for explaining one embodiment of the present invention. Figure 4 is a side view showing the basic principle configuration, Figure 5 is a front view of the same, and Figure 6 is the same as that shown in Figure 4. Vl - Vl arrow symbol, No. 7
Figures (a) to (c), 8th VA (d) (e), and 9th VA
Figure 10 is a diagram for explaining the control pattern of the intermediate [1-rule] of the embodiment, and Figure 10 shows the specific configuration of the embodiment.
The side view, Figure 11 is a view taken along arrows XI-XI in Figure 10.
Figure 2 is a side view of Figure 10 1-14'A showing a state in which the intermediate roll has been shifted in the horizontal direction, and Figure 13 is a side view of Figure 11 showing a state in which the intermediate roll is bent. A partially omitted diagram, FIG. 14, is a diagram similar to FIG. 11, but does not show another embodiment of the present invention. 11... Work roll, 13... Backup roll, 15.15'... Intermediate roll, 15a. 15b, '15' a, i5' l+, i5cm ---
-Divided roll, 16... Press] G no roll, 1
7...Press roll, 18...Cylinder, 19...Shift screw, L...Work roll axis, S...Dividing point , α1゜α2...
...Inclination angle, δ...Shift 1-early. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 R (A) C mouth: (C)

Claims (1)

[Claims] In a multi-high rolling machine in which an intermediate roll that presses against both eye rolls is interposed between work rolls a3 and backup rolls disposed above and below, the intermediate roll is divided in the axial direction into a plurality of divisions. The dividing opening is divided into rolls, at least one of the divided rolls is configured to be tiltable with respect to the axis of the work roll, and a tilting means capable of adjusting the inclination angle of the divided roll is provided.
A shifting mechanism is provided for horizontally moving an intermediate roll consisting of a work roll in a direction substantially perpendicular to the axis of the work roll, and a bending mechanism is provided for applying a vertical pending force to both ends of the work roll. A multi-high rolling mill characterized by: