JPH08215747A - Pinch roll equipment for thin sheet producing and treating line - Google Patents

Abstract

PURPOSE: To make it possible to impart a meandering preventive function by constituting the equipment in such a manner that a recessed crown roll is split rolls split in an axial direction and that the respective split rolls are respectively independently and freely turnably supported on a supporting shaft via bearings. CONSTITUTION: A lower roll 1 is an integral roll of a projecting crown. The upper roll 2 is the split rolls split axially to >=3 pieces having the recessed crowns corresponding to the projecting crown of the lower roll 1 as to approximately form the distribution in an axial direction of the gap of the upper and lower rolls uniform. The respective split rolls of the upper roll 2 are freely turnably supported around a supporting shaft 7 via the respectively independent bearings and are, therefore, rotatable at the respectively independent numbers of revolutions in synchronization with the pass speed of a thin sheet 3. On the other hand, the lower roll 1 is the integral roll and, therefore, the number of revolutions is common in the axial direction. The circumferential speed of the roll surface is thus made slower from a line center 4 toward the end sides of the roll body by an effect of the projecting crown.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, a hot strip mill, a cold strip mill, a thin plate production line by strip casting, continuous annealing equipment, surface treatment equipment,
In the manufacturing and processing lines for thin plates of metal such as slitter lines and automatic press lines, to give driving force for passing the thin plates or to give tension to the thin plates, and further in the traveling direction of the thin plates. The present invention relates to a pinch roll facility applied to change the sheet thickness, which has a function of preventing the thin plate from meandering.

[0002]

2. Description of the Related Art Originally, by simply pinching a thin plate within its elastic limit with a pair of upper and lower pinch rolls and passing it through, it is possible to expect the effect of preventing the meandering of the thin plate to some extent in a thin plate manufacturing / processing line. However, factors such as poor dimensional accuracy and uneven surface properties of the thin plate itself, error in verticality of the pinch roll itself with respect to the passing line direction, poor dimensional accuracy of the pinch rolls, and uneven surface properties of the pinch rolls, etc. It is not uncommon for thin plates to meander. In the worst case, this meandering phenomenon causes an accident such that the thin plate deviates from the threading line and the line stops.
Even if it is not so important, the meandering may deteriorate the accuracy of the thin plate processing or processing performed before and after the pinch roll, or the meandering itself may deteriorate the shape and size of the thin plate. Establishing is a very important issue for sheet manufacturing and processing lines.

Various attempts have been made to give the pinch roll itself a meandering prevention function.
A typical example is pinch roll 1, as shown in FIG.
1'is to give a convex crown. When a convex crown is applied to the pinch roll itself, that is, when the roll radius at the end of the roll cylinder is made smaller than the roll radius at the center of the roll cylinder length, in particular, one of the pinch rolls is wrapped with a thin plate at a finite angle. When it is applied to the process of changing the traveling direction of the to the outside of the plate surface, a meandering correction effect called "thread winding effect" can be expected. This is because, as shown in FIG. 8, when the thin plate 3 deviates from the plate passing line center 4, the thin plate on the pinch roll entrance side inclines in the direction of returning to the plate passing line center. However, when the thin plate is not wound around the pinch roll, this effect cannot be expected, and the convex roll is not always advantageous.

In Japanese Patent Publication No. 6-88068,
As a roll having a meandering-preventing function even in a process that does not require the winding of a thin plate, the sleeve is rotatably attached to the arbor via an eccentric ring and a self-aligning bearing, and the peripheral speed of the sleeve is In vector,
A roll of a type that can add a slight velocity component toward the center of the threading line has been proposed. However,
In this method, since the centering effect of the thin plate depends on the widthwise component of the pinch roll peripheral velocity vector, the buckling of the material in the widthwise direction becomes a problem especially in the case of thin materials, and the velocity component in the widthwise direction is transmitted to the thin plate. Since the contact arc length must be longer than a certain length, the use of a rubber roll is a prerequisite for practical use.

[0005]

As described above, according to the conventional method, the winding of a thin plate is premised, and the use of a rubber roll as the pinch roll is a precondition.

However, in general, in order to obtain the wrapping angle, a space corresponding to the wrapping angle is required, and the number of rolls required correspondingly increases, so that the wrapping angle is set on the pinch roll. There is a considerable amount of equipment that cannot be taken, and even if it is possible in design, there is a problem that the equipment cost increases because the winding angle is taken.

When it is premised that a rubber roll is used, it goes without saying that the manufacture of a thin plate in a high temperature state
It becomes impossible to carry out the treatment, and it becomes impossible to apply a large tension or driving force to the thin plate. Particularly, in the case of the roll disclosed in Japanese Examined Patent Publication No. 6-88068, it is premised that a self-aligning bearing and a sleeve are used. Therefore, a driving device is provided on the roll to apply tension or driving force to the thin plate. Not easy to do.

The present invention solves the problems of the conventional method as described above, and provides a pinch roll facility having a meandering prevention function without presupposing the winding of a thin plate or the adoption of a rubber roll.

[0009]

The first gist of the present invention is as follows.
In a pinch roll facility composed of a roll having a convex crown and a roll having a concave crown, which is paired with the roll, the concave crown roll is a divided roll divided into three or more in the axial direction. Are pinch roll equipment of a thin plate manufacturing / processing line, which are independently rotatably supported by a support shaft via bearings. The second gist is a main drive device for roll rotation. And a roll provided with a convex crown, and a pair of rolls having a concave crown and paired with the roll, and the concave crown roll is a divided roll divided into three or more in the axial direction. In the pinch roll equipment of the thin plate manufacturing / processing line, each of the divided rolls is independently rotatably supported by a support shaft via a bearing.

[0010]

The operation of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the configuration of a preferred embodiment of the pinch roll equipment of the first invention. In the example of FIG. 1, the lower pinch roll 1 is an integral roll, and is provided with a convex crown so that the radius of the body end portion is smaller than the radius of the center portion of the body portion. The upper pinch roll 2 facing the lower roll with the thin plate 3 sandwiched therebetween is divided into five in the axial direction, and each of the divided rolls 2-1, 2-2, 2-3, 2-4, 2-5 has , Bearings are individually provided, and are supported by the support shaft 7 via the bearings. Therefore, the split rolls 2-1 to 2-5 can rotate around the support shaft 7 at free rotation speeds.

The profile of each divided roll of the upper pinch roll is, as shown in FIG. 1, a concave crown profile corresponding to the convex crown of the lower roll so that the axial distribution of the upper and lower roll gaps becomes substantially uniform. However, for the purpose of simplifying the manufacturing process and equipment maintenance, as shown in FIG. 2, each split roll has a flat profile to allow unevenness of the upper and lower roll gaps in each split roll unit. Alternatively, the radius of each of the divided rolls may be slightly changed, and a concave crown corresponding to the convex crown of the lower roll may be provided as the entire upper roll. In this case, the contact pressure distribution with the passing thin plate becomes more uneven than in the case of FIG. 1, but the convex crown amount of the lower pinch roll is reduced,
Further, by increasing the number of divisions of the upper roll, it is possible to stop the non-uniformity of the contact pressure within a practically acceptable range.

In the case of FIGS. 1 and 2, the upper roll is divided so that the width of each divided roll is uniform. In this case,
For example, in the case of FIG. 1, the split roll 2-1 or 2-5
The non-uniformity of the peripheral speed of the inner roll becomes larger than that of the central peripheral roll 2-3, and the relative sliding speed with the thin plate 3 increases as it goes to the end of the roll body. In the case of FIG. 2, the diameter difference between the dividing rolls 2-1 and 2-2 is larger than the diameter difference between the dividing rolls 2-2 and 2-3, and the thin plate 3
The non-uniformity of the contact pressure distribution with and becomes larger toward the end of the roll body.

The uneven division shown in FIGS. 3 and 4 can alleviate such a problem without increasing the number of divisions. In the embodiment shown in FIG. 3 and FIG. 4, the body length of the split roll is made shorter toward the roll barrel end. With such a structure, in the case of FIG. The relative slip velocity with the thin plate 3 can be equalized as compared with the case of FIG. 1, and in the case of FIG. 4, the non-uniformity of the contact pressure distribution with the thin plate 3 is equalized as compared with the case of FIG. can do.

Now, the function of the pinch roll of the present invention for preventing the meandering will be described. In the examples of FIGS. 1 to 4, the lower roll 1 is an integral roll with a convex crown, and the upper roll 2 is a concave crown corresponding to the convex crown of the lower roll 1 so that the axial distribution of the upper and lower roll gaps is substantially uniform. Is a split roll. Since each of the divided rolls of the upper roll is rotatably supported around the support shaft 7 via an independent bearing, each of the divided rolls can rotate at an independent rotation speed in accordance with the passing speed of the thin plate 3. it can. On the other hand, since the lower roll 1 is an integral roll, the rotation speed is common in the axial direction, and therefore, the peripheral speed of the roll surface becomes slower from the line center 4 to the roll body end side due to the convex crown effect. Therefore, when considering the widthwise distribution of the frictional force acting in the sheet passing direction due to the relative speed with respect to the thin plate, it is not necessary to consider the upper rolls that can rotate at free speeds, that is, the divided concave crown rolls. Therefore, in the following, the action of the meandering prevention function will be described, focusing on the lower roll, that is, the integrated convex crown roll 1.

FIG. 5 (a) is a plan view of the state in which the thin plate 3 is pinched by the pinch rolls shown in FIGS. 1 to 4 and is conveyed in the traveling direction shown by an arrow 5 as seen from the convex crown roll 1 side. It shows with. By providing the pinch roll 1 with a convex crown, the peripheral velocity of the pinch roll is maximized at the center of the body length and minimized at the body end. On the other hand, since the traveling speed of the thin plate 3 is uniform in the plate width direction, the difference between the peripheral speed of the pinch roll and the traveling speed of the thin plate is as shown in FIG.
The distribution is as shown in (b). That is, the roll peripheral speed is faster at the center of the plate width and the plate speed is faster at the end of the plate width. In such a situation, as shown in FIG. 6A, when the thin plate 3 meanders to the drive side (DS), assuming that the plate accurately advances in the traveling direction, the roll peripheral speed and the plate speed are 6 has a non-symmetrical distribution as shown in FIG. 6 (b). When such a relative velocity distribution is obtained, a moment acts to rotate the thin plate 3 clockwise in the plan view. As a result, the thin plate 3 slightly tilts as shown in FIG. 6C, and the thin plate advances in this state, whereby the meandering generated in the DS is restored to the working side (WS). Since such a mechanism works, the pinch roll equipment of the present invention shown in FIGS. 1 to 4 has an autonomous meandering prevention function.

In the case of the method of the present invention described above, it is not a necessary condition to wind a thin plate around a pinch roll, and the velocity component in the plate width direction is changed as in the method disclosed in Japanese Patent Publication No. 6-88068. Since it is not used, buckling does not occur even with a thin steel plate, and it is not necessary to adopt rubber or the like on the pinch roll surface.

Incidentally, FIG. 7 shows an example in which the pinch roll equipment of the present invention is used in a form in which a thin plate is wound around the convex crown roll 1 side. In this case, in addition to the function to prevent meandering by the relative speed of the roll and the thin plate explained so far, the "thread winding effect" by the convex crown roll described in the section [Prior Art] is synergized to prevent meandering. The function is further enhanced.

Further, the second invention is characterized in that only the convex crown roll has a main driving device for rotating the roll. FIG. 7 also shows that embodiment, but by driving only the convex crown roll 1 by the roll driving device 6, it is possible to apply a driving force and a tension to the thin plate with inexpensive equipment, and It is possible to obtain an excellent anti-meandering function.

By the way, in the conventional pinch roll using the integral rolls on both the upper and lower sides, the convex crown of the pinch roll is increased in order to increase the meandering prevention force due to the relative velocity distribution between the roll peripheral velocity and the plate velocity described in the present invention. As a result, the contact pressure distribution between the thin plate and the pinch roll becomes a convex shape, and the effect of destabilizing the meandering characteristic occurs due to the widthwise distribution of elastic elongation in the advancing direction of the corresponding plate. Further, when a convex crown is applied, the pinch roll will not finally come into contact with the thin plate in the vicinity of the plate end, and the threading will be extremely unstable. On the other hand, in the present invention, the profile of the split rolls can be freely set corresponding to the convex crown of the integral pinch roll, so that the thin plate and the pinch roll can always be brought into contact with each other over the entire width.

Further, if an eccentric sleeve or an eccentric shaft is provided inside the bearings of the split rolls to impart an independent rolling reduction function to each split roll, the roll gap can be adjusted according to the widthwise thickness distribution of the thin plate 3. By utilizing this function, it is also possible to make the widthwise distribution of the pressure between the thin plate and the pinch roll a concave shape, that is, to increase the pressure on the plate end side to make the meandering characteristic more stable.

In the above description, the split roll is mainly divided into five parts in the axial direction, but the number of splits may be three or more, and the type of thin plate to be passed and the equipment. It may be decided considering the cost. It goes without saying that the present invention can be similarly applied even if the convex crown roll and the split roll are turned upside down.

[0022]

[Example] A thin steel plate having a plate width of 1000 mm and a plate thickness of 1.0 mm
Radius 200mm, trunk length 1200mm, distance between fulcrums 1500mm
It is a facility to pinch with a rolling force of 5.0 tonf using a pinch roll of No. 2, and to drive the pinch roll to give tension to the plate, and at the beginning, it was passed using a pair of flat roll pinch rolls with zero crown. However, there was a threading problem due to meandering. Next, when a crown of 50 μm per radius was applied to both pinch rolls, the passing condition was slightly improved, but the passing problem still occurred.
Next, when the crown was increased to 200 μm / radius,
The pinch roll and the thin steel plate did not come into contact with each other across the entire width, and the passing condition was not improved. Therefore, only one roll having a convex crown of 200 μm / radius is left, and this roll is used as a drive roll, and one roll is divided into five rolls in the width direction, and a roll aligned with the other convex crown as shown in FIG. A profiled pinch roll of the invention was introduced. This drastically improved the strip running condition and eliminated the strip running trouble.

[0023]

EFFECT OF THE INVENTION The pinch roll equipment of the present invention is used to manufacture thin plates.
By applying it to the processing line, it is possible to impart a strong meandering prevention function to the pinch roll portion, and it is possible to eliminate production troubles and quality defects due to meandering of the thin plate near the pinch roll.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first preferred embodiment of a pinch roll facility of the present invention.

FIG. 2 is a diagram showing the configuration of a second preferred embodiment of the pinch roll equipment of the present invention.

FIG. 3 is a diagram showing the configuration of a third preferred embodiment of the pinch roll equipment of the present invention.

FIG. 4 is a diagram showing the configuration of a fourth preferred embodiment of the pinch roll equipment of the present invention.

FIG. 5 is a plan view of a state in which a thin plate is normally passed by using the pinch roll equipment of the first aspect of the present invention (a).
And (b) is a relative velocity distribution diagram of the roll and the thin plate.

FIG. 6 is a plan view (a) in which a thin plate is passed through using the pinch roll facility of the first invention, and the thin plate meanders to a drive side, and a relative velocity distribution diagram (b) between the roll and the thin plate. , And a view of a state in which the thin plate is inclined in the plate surface in the direction in which the meandering is corrected (c).

FIG. 7 is an explanatory view of a yarn winding effect which is a meandering correction mechanism when a thin plate is wound around a convex crown roll, and an embodiment of the second invention.

FIG. 8 is an example of a conventional technique in which two pinch rolls are both provided with a convex crown.

[Explanation of symbols]

1,1 'Convex crown pinch roll 2 (2-1,2-2,2-3,2-4,2-5) Dividing pinch roll 3 Thin plate 4 Line center 5 Thin plate advancing direction 6 Roll driving device 7 Dividing pinch roll Support shaft

Claims (2)

[Claims] 1. A pinch roll facility comprising a roll having a convex crown and a roll having a concave crown and paired with the roll, the concave crown roll being divided into three or more axial rolls. And, each split roll is independently supported by a support shaft via a bearing so as to be freely rotatable, and a pinch roll facility for a thin plate manufacturing / processing line. 2. The pinch roll equipment for a thin plate manufacturing / processing line according to claim 1, wherein only the roll having the convex crown has a main drive device for rotating the roll.