JPH0891654A - Material feeding device, which can restrict meandering - Google Patents

Abstract

PURPOSE: To obtain a feeding device, which can restrict the meandering of material, without generating lowering of material temperature, deformation of material shape, rise of equipment cost and running cost by nipping the material between the grooved cylindrical surface and the projecting cylindrical surface formed in a pair of upper and lower rolls. CONSTITUTION: In a material feeding device, both of an upper and a lower rolls 3, 2 are respectively supported by bearing boxes 5 through each bearing 4. The lower bearing boxes are provided on a lower fixed frame 8, and the upper bearing boxes are connected to each gap adjusting mechanism 6 provided in an upper fixed frame 7. In this case, the lower roll 2 is formed with a groove so that the width (b1) of the groove bottom having the cylindrical surface concentrical with the roll shaft is wider than the width B of the material and that the groove height (a1) is formed higher than the thickness (t) of the material. On the other hand, the upper roll 3 is formed with a projection so that the width (b2) of the projecting surface having the cylindrical surface concentrical with the roll shaft is smaller than the groove width (b1) of the groove provided in the lower roll 2 and that the projection height (a2) is larger than the groove depth (a1) of the groove provided in the lower roll 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line for transporting a material in a heated state, such as a hot strip rolling mill or a thin wall continuous casting facility, and in particular, the material transport time is long and the temperature of the material is high. The present invention relates to a device for suppressing the meandering of a material generated in a material feeding device using a roll such as a pinch roll or a rolling mill arranged on a line at a high temperature near the freezing point and having an extremely small material thickness.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed and implemented as a method for suppressing the meandering of a material generated in a material feeding device using a roll installed in a material conveying line.

For example, in a continuous surface treatment line for steel sheets, as described in Japanese Patent Application Laid-Open No. 03-114608, a roll around which a material is wound is constructed so as to be rotatable about a certain fulcrum, and A steering roll is used in which a detector for detecting the meandering amount by measuring the off-center or end position of the material is provided and the roll is rotated according to the detected meandering amount to correct the meandering amount of the material.

Further, in the hot strip steel rolling line, the actual flatness 0
As described in Japanese Patent Publication No. 4-22105, flat plates are arranged in front of and behind the feeding device at intervals wider than the width of the material so as to be parallel to the material advancing direction, and when the material meanders, the ends hit the flat plate and more. Side guides are used to prevent the meandering from spreading.

Further, in the rolling mill, Japanese Patent Laid-Open No. 63-
As described in Japanese Patent No. 201111, a detector for detecting the meandering amount by measuring the off-center or end position of a material is provided on the front surface or the rear surface of the rolling mill, and the work side of the rolling mill according to the detected meandering amount. Alternatively, leveling is performed to control the meandering amount of the material by changing the roll gap amount on either one of the drive side and inclining the roll.

Further, in Japanese Laid-Open Patent Publication No. 63-36913, in a rolling mill having a roll shift mechanism, the forces acting between the upper and lower rolls are opposite to each other and are centered in the width direction. Or the bending force at the left and right of the origin and the acting force acting on the material from the bending surface intersect at three points with straight lines that are point-symmetric with respect to the upper and lower rolls and are parallel to the roll axis and parallel to the roll axis and pass through the origin. A method is described in which the meandering of the material is suppressed by providing an initial crown so as to face each other in opposite directions and in the center in the width direction.

[0007]

As described above, various kinds of materials that suppress the meandering of the material generated in the material feeding device using rolls such as pinch rolls and rolling mills arranged in a line for conveying the material in a heated state are used. Although the method has been taken, it is necessary to convey the material continuously for a long time, such as in a thin wall continuous casting facility, the material thickness is extremely small and the material strength is low at an extremely high temperature just below the freezing point, and further, When it is not desirable to lower the temperature of the material metallurgically, none of them have sufficient functions and effects.

For example, in the method using the steering roll mentioned in the section of the prior art, since a high-temperature material is wound around the roll, if the material is continuously conveyed for a long time, heat is transferred from the material to the roll. The surface and shaft temperatures rise, and the roll becomes unusable due to deterioration of the roll material or strength decrease due to temperature rise. Further, if the inside of the roll is cooled, the temperature rise of the roll can be avoided, but the material temperature is also lowered. Further, if a heat insulating material is used on the surface of the roll, a rise in the roll temperature and a decrease in the material temperature can be avoided, but the heat insulating material is severely deteriorated, and there is a problem that equipment cost and running cost rise sharply. In addition, a detector that detects the amount of meandering by measuring the off-center or end position of the material is required, but if the material has temperature unevenness in the width direction or the end shape is not parallel to the traveling direction of the material. It is impossible to detect the meandering amount.

Further, in the method using the side guides, when the material thickness is extremely small, the temperature is extremely high, and the strength is low, when the edge of the material hits the guide plate at the time of meandering of the material, folding occurs, and after the feeding device. It hinders the material transportation.

Further, the leveling method requires a detector for detecting the amount of meandering by measuring the off-center or end position of the material. However, the material has temperature unevenness in the width direction or the end shape is different from that of the material. If it is not parallel to the traveling direction, it is impossible to detect the meandering amount. Further, a mechanism for independently changing the roll gap amount on the work side and the drive side of the material feeding device is required, so that there is a problem that equipment cost increases.

Further, according to the method disclosed in Japanese Patent Laid-Open No. 63-36913, when the material is extremely thin, the temperature is extremely high and the strength is low, the material shape follows the shape of the roll crown given to the roll. As a result, the material conveyance after the feeder is hindered. Further, there is a problem that the initial crown applied to the roll changes due to thermal expansion, and the force applied to the material from the roll cannot be opposed to each other at the center in the width direction.

As described above, in any of the techniques, the material conveying time is long, the material thickness is extremely small, the temperature is extremely high near the freezing point, the strength is low, and the material temperature can be lowered metallurgically. It has problems for undesirable cases and therefore cannot be an effective means of suppressing material meandering.

The problem to be solved in the present invention is to reduce the material temperature without lowering the material temperature even when the material is transported for a long time, the material thickness is extremely small, and the temperature is extremely high near the freezing point and the strength is low. An object of the present invention is to provide a feeding device that suppresses the meandering of material without deforming the shape and increasing the equipment cost and running cost.

[0014]

SUMMARY OF THE INVENTION The present invention is a device for sandwiching a material between a pair of upper and lower rolls and feeding the material by rotating the rolls, wherein one roll has a cylindrical surface concentric with the roll shaft. A groove is provided such that the width of the groove bottom is wider than the width of the material and the height of the groove is higher than the thickness of the material, and the width of the projection surface having a cylindrical surface concentric with the roll shaft is provided on the other roll. It is characterized in that a protrusion is provided so as to have a width equal to or less than the width and a protrusion height is larger than the groove depth, and a material is sandwiched between the groove bottom cylindrical surface and the protrusion cylindrical surface.

Further, in the material feeding device of the present invention, the width of the projection surface having the cylindrical surface concentric with the roll shaft provided on the other roll is the difference between the groove width of the groove provided on the one roll and the material thickness. It is more than doubled.

Further, the angle formed between the side surface of the groove provided on one roll and the groove bottom and the angle formed between the side surface of the projection provided on the other roll and the projection surface are less than 90 °.

[0017]

[Function] The material is deformed because the material is sent by being sandwiched by the cylindrical surface of the groove bottom that is concentric with the roll axis of one roll and the cylindrical surface of the protruding cylindrical surface that is concentric with the roll axis of the other roll. The material can be conveyed without causing it.

When the height of the groove provided on one roll is higher than the thickness of the material and the height of the protrusion on the other roll is greater than the depth of the groove, the material starts to meander. However, since the edge of the material is constrained by the side surface of the groove and the material is constrained by the roll groove bottom roll protrusion surface in the immediate vicinity, the meandering does not cause a fold at the material end surface and the difference between the groove width and the material width Can be suppressed to less than half the value of. Further, if the gap formed between the side surface of the groove and the side surface of the protrusion is smaller than the thickness of the material, the effect of preventing deformation of the material end surface is large.

Since the material feeding device itself is the meandering suppressing device, it is more advantageous in terms of equipment cost and running cost than the case where the meandering suppressing device is provided as a device different from the material feeding device, and the temperature of the material is lowered. Few.

Since a detector for detecting the amount of meandering is not required, it is advantageous in terms of equipment cost and running cost, and suppresses meandering even if the material has temperature unevenness in the width direction or the end shape is not parallel to the material advancing direction. Is possible.

Since a mechanism for independently changing the roll gap amount on the work side and the drive side of the material feeding device is not required, it is advantageous in terms of equipment cost and running cost.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a material feeding apparatus according to the present invention, which is composed of an upper roll 3 and a lower roll 2. Each roll is supported by a bearing box 5 via a bearing 4, a lower bearing box is installed on a lower fixed frame 8, and an upper bearing box is connected to a gap adjusting mechanism 6 installed on an upper fixed frame 7. The lower roll 2 is provided with a groove having a groove bottom having a cylindrical surface concentric with the roll axis such that the width b1 of the groove bottom is wider than the width B of the material and the groove height a1 is higher than the thickness t of the material. The width b2 of the projection surface having a cylindrical surface concentric with the roll axis is less than the groove width b1 of the groove provided on the lower roll 2 and the projection height a.
The protrusion is provided so that 2 is larger than the groove depth a1 of the groove provided in the lower roll 2. The groove height a1 of the lower roll 2 is higher than the thickness t of the material, and the protrusion height a2 of the upper roll 3 is larger than the groove height a1 of the lower roll 2. Therefore, the groove bottom surface e1 of the lower roll 2 and the upper roll 3 are When a pressing force is exerted by the gap adjusting mechanism 6 between the protruding surfaces e2 of the
It is sandwiched between the groove bottom surface e1 and the protruding surface e2 of the upper roll 3. When the roll is rotated in this state, the material 1 is sent out by using the reduction force and the multiplier of the friction coefficient between the roll and the material 1 as the driving force. Here, the groove bottom surface e1 of the lower roll 2
Since the protruding surface e2 of the upper roll 3 is a cylindrical surface concentric with the roll axis of each roll, the material 1 is sent out without deforming its shape.

FIG. 2 shows a material feeding device according to the present invention, in which the width b2 of the protruding surface of the upper roll 3 is more than twice the difference between the groove width b1 of the lower roll 2 and the material thickness t, that is, the side surface f1 of the groove. And the side surface f2 of the projection are formed with a gap c between the material thickness t
In the following embodiments, the material 1 feeding mechanism is the same as that shown in FIG.

FIG. 3 shows the material 1 meandering in the embodiment shown in FIG. Even when the material 1 meanders, the end portion of the material 1 is constrained by the side surface f1 of the groove of the lower roll 2, and in its immediate vicinity is constrained by the groove bottom surface e1 of the lower roll 2 and the protruding surface e2 of the upper roll 3, The meandering amount is set to the groove width b1 without causing the end face of the material 1 to be folded.
And the material width B can be suppressed to half or less of the difference. Further, since the gap c formed between the side surface f1 of the groove and the side surface f2 of the protrusion is smaller than the thickness t of the material, the material 1
The effect of preventing deformation of the end face of is great.

FIG. 4 shows a material feeding device according to the present invention, in which the angle θ1 formed by the side surface f1 of the groove of the lower roll and the groove bottom e1 and the angle θ2 formed by the side surface f2 of the projection of the upper roll and the projection surface e2 are 90 °. And the groove width b of the lower roll 2
1 and even when the processing accuracy of the protrusion width b2 of the upper roll 3 is not strict, the gap C between the side face f1 of the groove and the side face f2 of the protrusion is secured by the material thickness t sandwiched between the groove bottom e1 and the protrusion surface e2. can do. Further, even when the side surface f1 of the groove and the side surface f2 of the protrusion are worn by using the roll,
Roll grinding can be performed without expanding the gap C between the side surface f1 of the groove and the side surface f2 of the protrusion. Angles θ1 and θ2 are 90 °
Hereinafter, 86 ° to 89 ° is desirable, and the groove angle θ1 is desirably smaller than the protrusion angle θ2.

FIG. 5 shows an embodiment in which the material feeding device according to the present invention is provided with grooves on the upper roll 3 and projections on the lower roll 2. The effect is no different from the case where the groove is provided on the lower roll 2 and the protrusion is provided on the upper roll 3.

Further, in the above-mentioned embodiment, the description has been given based on the drawing in which the cylinder is used as the gap adjusting mechanism 6, but the present invention can be applied to the case where other actuators such as a screw and a spring are used. . Further, the upper bearing box may be fixed to the upper fixed frame 7, and the lower bearing box may be connected to the gap adjusting mechanism 6 installed in the lower fixed frame 8.

[0029]

EFFECTS OF THE INVENTION Even when the material is transported for a long time, the material thickness is extremely small, and the temperature is extremely high near the freezing point and the strength is low, the shape of the material is deformed without lowering the temperature of the material. Moreover, the meandering of the material can be suppressed without increasing the facility cost and running cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example in which a groove is provided on a lower roll and a protrusion is provided on an upper roll in a material feeding device of the present invention.

FIG. 2 is a cross-sectional view showing an example in which the width of the protruding surface is set to be twice or more the difference between the groove width of the groove and the material thickness in the material feeding device of the present invention.

FIG. 3 is an example in which the width of the protruding surface is set to be twice or more the difference between the groove width and the material thickness in the material feeding device of the present invention, and the edge of the material is restrained by the side surface of the groove, and meandering is suppressed. It is sectional drawing which shows a mode.

FIG. 4 is a graph showing an angle formed by a side surface of a groove and a groove bottom and an angle formed by a side surface of a projection and a projection surface in the material feeding device of the present invention.
It is sectional drawing which shows the example which is less than °.

FIG. 5 is a cross-sectional view showing an example in which a groove is provided on an upper roll and a protrusion is provided on a lower roll in the material feeding device of the present invention.

[Explanation of symbols]

 1 Material 2 Lower Roll 3 Upper Roll 4 Roll Bearing 5 Bearing Box 6 Gap Adjusting Mechanism 7 Upper Fixed Frame 8 Lower Fixed Frame B Material Width t Material Thickness a1 Groove Height a2 Protrusion Height b1 Groove Width b2 Protrusion Width C Groove Formed between the side surface of the projection and the side surface of the projection d1 Groove bottom diameter d2 Projection surface diameter e1 Groove bottom surface e2 Projection surface f1 Groove side surface f2 Projection side θ1 Angle between the groove side surface and groove bottom θ2 Projection side surface Angle between and

Claims (3)

[Claims] 1. A device for sandwiching a material between a pair of upper and lower rolls and feeding the material by rotating the rolls, wherein the width of the groove bottom having a cylindrical surface concentric with the roll shaft on one roll is larger than the width of the material. A groove that is wide and has a groove height higher than the thickness of the material is provided, and the width of the protrusion surface having a cylindrical surface concentric with the roll shaft is equal to or less than the groove width and the protrusion height is equal to the groove height. A material feeding device characterized in that a protrusion is provided so as to be larger than the depth, and a material is sandwiched between the groove bottom cylindrical surface and the protruding cylindrical surface. 2. The roll according to claim 1, wherein the width of the projection surface having a cylindrical surface concentric with the roll shaft provided on the other roll is at least twice the difference between the groove width of the groove provided on the one roll and the material thickness. Material feeding device characterized in that 3. The angle according to claim 1, wherein the angle formed by the side surface of the groove provided on one roll and the groove bottom and the angle formed by the side surface of the projection provided on the other roll and the projection surface are less than 90 °. Material feeder.