JPH01107919A - Tension leveller - Google Patents

Abstract

PURPOSE:To prevent the defective shape of a center elongation and to improve the flatness of a thin sheet by combining at least one roller provided with the tapered part whose diameter becomes larger gradually than that of a shell center part toward the shell end face at one part of the shell end part in the roller group of a tension leveller. CONSTITUTION:In case of levelling a thin sheet causing the defective shape of a center elongation shape correcting rollers 15, 16, 17 are respectively moved in E, F, G directions by a moving device 34 and positioned so that the large diameter tapered parts 18, 19, 20 may come onto the both end parts of the plate width of a thin sheet 2. The plate width both end parts of the thin sheet 2 are thus subjected to levelling by the large diameter tapered parts 18, 19, 20. And the elongation of the both end parts vicinity is increased, the thin sheet 2 is uniformly elongated in the width direction and the center elongation is corrected. Also, the generation of the center elongation by the shape correction rollers 15, 16, 17 themselves is prevented as well.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tension leveler for thin plate materials, and in particular to a roller that applies tension to a thin plate material and corrects the flatness of the thin plate material by bending and stretching the thin plate material. The present invention relates to a tension leveler that is suitable for preventing shape defects such as edge elongation and mid-elongation of thin plate materials in a tension leveler equipped with groups.

[Conventional technology]

In the final finishing stage of thin plate m-manufacturing equipment, Japanese Patent Application No. 54-123809 or Japanese Patent Application No. 57-47414
As described in the issue, a tension leveler equipped with a group of rollers that applies tension to a thin plate material and bends and stretches the thin plate material to correct the flatness of the thin plate material is used. This is to correct shape defects caused by rolling history and heat treatment. In particular, the tension levelers described in these patent applications correct shape defects such as edge elongation and mid-elongation of thin sheet materials, and suppress their occurrence, thereby significantly improving the flatness of thin sheet materials. .

In other words, a thin sheet material is given a unique hardness distribution in the width direction depending on its refining process, but for example, when a thin sheet material with a rim layer of low hardness at the width end of the sheet is passed through a tension leveler, The edges of the plate width, which have lower hardness, elongate more than the center,
A shape defect called edge elongation occurs. Special application 1977-1
In the tension leveler described in No. 23809, in order to deal with such end elongation, a roller is provided that has a small diameter tapered part on one of the cylinder ends, the diameter of which becomes gradually smaller than the cylinder center part toward the cylinder end surface. The flatness is improved by making the edges of the plate less likely to stretch than the center.

Moreover, in the case of a thin plate material in which the hardness of the width end portions is higher than that of the center portion, a shape defect called mid-elongation occurs, contrary to the above.

Regarding this medium elongation, the above-mentioned patent application No. 54-123809
The tension leveler of this issue uses a so-called concave crown roller, in which the diameter of the center of the roller is narrower than that of both ends of the body. Since the center part of the roller is thinner than both ends of the body, the center part of the thin plate material is less likely to stretch than both ends of the body, and shape defects caused by mid-elongation are corrected.

In addition, in the tension leveler described in Japanese Patent Application No. 57-47414, the amount of curvature of the work roller is made variable to obtain a concave crown effect by curving it in the axial direction of the roller against such medium elongation. By making the amount adjustable, flatness is improved.

[Problem that the invention seeks to solve]

As described above, by using the above-mentioned conventional tension leveler, the flatness of the thin plate material was improved, but there still remained unsatisfactory items regarding correction of shape defects in medium elongation.

That is, in the tension leveler disclosed in Japanese Patent Application No. 54-123809, the occurrence of poor mid-elongation is prevented by employing the concave crown roller as described above. however,
The concave crown shape of this roller is constant and cannot be changed unless the roller is replaced. Therefore, depending on the specifications of the thin plate material, it may not be possible to respond appropriately.2 For example, if the roller is flat and does not require modification, When handling thin plates, using a concave crown roller will result in poor shape due to edge elongation.When handling thin plates with different widths, use a concave crown roller that is appropriate for all widths. Cannot give shape.

An attempt was made to solve the above problems with a tension leveler disclosed in Japanese Patent Application No. 57-47414. That is, as described above, by curving the work roll and making it possible to adjust the amount of concave crown, any desired concave crown shape can be obtained.

However, this method requires the work roller to bend into a concave crown shape while in contact with the thin plate material. However, the work roller is supported by two intermediate rollers that are thicker than the work roller. Therefore, in order to curve the work roller into a concave crown shape, it is necessary to curve these two intermediate rollers at the same time, but these intermediate rollers are curved by the bending reaction force of the thin plate material applied to the work roller.
Only by bending these intermediate rollers can the work rollers also be bent.

However, defects in the shape of thin plates are more likely to occur as the thickness of the plate becomes thinner, and in recent years, the thickness of thin plates has tended to become thinner and thinner. In such thin plate materials,
The bending reaction force applied to the work roll becomes extremely small. Therefore, when the above-mentioned conventional technology is applied to such a thin plate material, the work roller cannot be sufficiently curved, an appropriate amount of concave crown cannot be obtained, and mid-elongation shape defects cannot be sufficiently eliminated. There was a problem that it could not be fixed.

Therefore, the object of the present invention is to prevent the occurrence of shape defects during mid-elongation,
An object of the present invention is to provide a tension leveler capable of improving the flatness of a thin plate material.

[Problem that the invention seeks to solve]

The above object is characterized in that the roller group of the tension leveler incorporates at least one roller having a large-diameter tapered portion that gradually becomes thicker in diameter toward the end face of the cylinder than the central part of the cylinder. This is achieved by using a tension leveler.

[Effect]

Since the large-diameter taper portion is provided at the body end, the width end of the thin plate material is stretched more than other parts. Therefore, the shape defect of medium elongation is corrected. Furthermore, since the large-diameter taper portion is provided at one end of the body, by moving the roller in the axial direction, it is possible to handle thin plates of various widths. Furthermore, for thin plates that do not require modification, normal leveling can be performed using the center section of the body.

〔Example〕

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

In FIG. 1, reference numeral 1 denotes a tension leveler according to an embodiment of the present invention, and bridle rollers 3.4 are installed before and after the tension leveler 1 to apply tension to the thin plate material 2 passed through the tension leveler 1. It is located.

The bridle roller 3 on the entry side is composed of two rollers 5 and 6, and a thin plate material is wound around these rollers 5 and 6 to apply backward tension to the tension leveler 1. The bridle roller 4 on the exit side also consists of two rollers 7 . 8 , on which again a sheet material is wound, applying a forward tension to the tension leveler 1 . These bridle rollers 3.4 apply a tension to the thin plate material 2 that is approximately 1/3 of the normal yield stress.

The tension leveler 1 includes a large-diameter guide roller 10 and 2
Book small diameter stretching rollers 11 and 12, two large diameter intermediate guide rollers 13 and 14, and sheet width direction warping correction roller 1
5, a small-diameter roller 16 and a large-diameter roller 17 for correcting warpage in the longitudinal direction of the plate, and warpage correction rollers 15, 16.1.
7 are also collectively referred to as shape correction rollers.

The stretching rollers 11 and 12 apply tension to the thin plate material 2, and bend and stretch the thin plate material 2 to correct a shape defect in the thin plate material.

The magnitude of the tension applied to the thin plate material is adjusted by moving the roller 11 up and down in the direction of arrow A, and the amount of elongation of the thin plate material is adjusted. The plastic elongation rate of the thin plate material by the stretching rollers 11 and 12 is normally about 0.5%.

The large-diameter intermediate guide rollers 13.14 are not essential rollers for the leveling action itself, but they are the stretching rollers 11, 12 on the entry side and the shape correction rollers 15, 16.1 on the exit side.
It serves to cut off the transmission of tension due to the leveling action of each of the elements 7 and to reduce mutual influence.

The thin plate material 4 that has passed through the intermediate guide rollers 13 and 14 has a bend called C warp in the width direction due to the action of the previous rollers, especially the strong bending action of the stretching rollers 11 and 12.
Generally, a bend called L-curvature occurs in the longitudinal direction. These C warps and L warps are corrected by the shape correction roller 15.
Amended by 16.17. That is, the C warp is corrected by adjusting the shape correction roller 15 up and down in the direction of arrow B. Further, the L warp can be corrected by adjusting the large diameter roller 17 on the exit side up and down in the direction of arrow C and adjusting the degree of bending of the thin plate material with the small diameter roller 16.

The guide roller 10, the tension roller 11.12 and the intermediate guide rollers 13, 14 each consist of rollers of constant diameter, as usual.

As shown in FIG. 2, each of the shape correction rollers 15, 16, and 17 has a linear large-diameter tapered portion 18, 19 at one end of the barrel, the diameter of which becomes gradually thicker toward the end surface of the barrel than at the center of the barrel.
．． 20, and a linear small-diameter tapered part 21.2 whose diameter becomes gradually smaller than the center part of the body toward the body end surface at the other end of the body end.
2.23 are provided, and roll portions 24, 25, and 26 of a constant diameter and having a length equal to or longer than the width of the thin plate material 2 are provided in the center of the body. Large diameter taper part 18, 19, 20, small diameter taper part 21, 22.23 and constant diameter roller part 24.25
．． The connection part with 26 has a smooth shape without steps. These shape correction rollers 15, 16, 17 are arranged so that their large diameter tapered portions 18, 19, 20 and small diameter tapered portions 21, 22, 23 are alternately located at both width ends of the thin plate material 2. has been done.

Each correction roller 15.16.1'7 is provided with a displacement device for axially displacing the roller.

3 and 4 show an example of such a mobile device,
That is, the shape correction roller represented by the reference numeral 30 is
Since the roller diameter is generally small, it is usually supported by a reinforcing roller 33 supported by a shaft 32 on a bearing stand 31. These reinforcing rollers 33 are arranged in two rows, aligned at predetermined intervals in the axial direction. Shape correction roller 30
are moved on these two rows of reinforcing rollers 33 by a moving device 34. The moving device 34 has a shaft 35 provided at one end of the body of the shape correcting roller 30, a bearing 37 fixed by an end plate 36 is supported on the shaft 35, and a hawk end 38 is mounted on the bearing 37. It is inserted.

The hawk end 38 is connected to the actuator 4 via the bottle 39.
0, and the operation of this actuator 40 moves the shape correction roller 30 in the axial direction. As the actuator 40, various types such as a hydraulic cylinder or a motor screw can be used.

Next, the shape correction rollers 15 and 16 configured in this way
．． The effect of No. 17 will be explained.

Defects in the shape of medium elongation that occur when leveling action is performed by passing the thin plate material 2 through the tension leveler 1 are caused by the thin plate material 2
This is caused by the central part of the plate being stretched more than the edge of the plate width. This kind of elongation occurs because the thin sheet material has a hardness distribution in the width direction, and the edges are harder than the center, or the thickness of the thin sheet material is not uniform, and the center portion of the sheet width is hard. This occurs due to reasons such as thickness. An example of a case where the end portions of a thin plate material are harder than the central portion is when the thin plate material is cast using a continuous casting machine. In other words, in a continuous casting machine, the short side of the slab is cooled and solidified by the fixed short side mold.
This increases the hardness of both ends of the resulting slab.

Therefore, when the cast slab is used as a thin plate material as it is, the hardness of both ends of the thin plate material increases correspondingly.

When leveling a thin plate material with such a shape defect due to medium elongation, the shape correction rollers 15, 16, and 17 are moved in the E direction, F direction, and G direction by the moving device 34, respectively, as shown in FIG. The rollers are moved and positioned so that the large-diameter tapered portions 18, 19, and 20 of each roller are positioned above both widthwise ends of the thin plate material 2. As a result, the widthwise ends of the thin plate 2 are leveled by the large-diameter tapered portions 18, 19° 20 of the rollers 15, 16, 17, the elongation of the thin plate near both ends increases, and the thin plate extends in the width direction. They get along equally.

This corrects the elongation during elongation of the thin plate material, and also prevents elongation from occurring due to the shape correction rollers 15, 16, 17 themselves.

On the other hand, if the hardness distribution or thickness distribution in the width direction of the thin plate material 2 is opposite to the above, shape defects due to edge elongation will occur. For such thin plate materials, a shape correction roller 15.
16 and 17 are moved by the moving device 34 in the H direction, ■ direction, and J direction, respectively, as shown in FIG. Position yourself so that it will come. As a result, both end portions of the thin plate material 2 are leveled at the small diameter taper portions 21, 22, 23, the elongation of those portions is reduced, and the thin plate material is uniformly flattened in the width direction. Therefore, the edge elongation of the thin plate material is corrected, and the occurrence of edge elongation due to the shaping rollers 15, 16 and 17 itself is also prevented.

In addition, if the hardness distribution and thickness distribution of the thin plate material in the width direction are uniform and there is no need to modify the shape for mid-elongation or edge elongation,
As shown in FIG.
position so that it supports the entire width of the thin plate. As a result, the thin plate material is leveled by the roller portion 24°25.26 over the entire width direction of the sheet material, and is flattened in a --like manner.

As a special case of elongation in the middle, if only one of the ends of the width of the thin sheet material has high hardness or the plate thickness is thick, a combination of elongation in the middle and elongation at one end will occur. An example of such special medium elongation occurring is when a slab cast by the above-mentioned continuous casting machine is cut into two pieces at the center in the longitudinal direction and used as thin plates. The hardness of only one end of the plate increases. When leveling such a thin plate material, a roller having a large-diameter tapered portion on the side where the hard end of the thin plate material is located among the shape correction rollers,
For example, if the lower end of the thin plate material 2 has a high hardness as shown in FIG. The roller 16 is positioned so that the constant diameter roller portion 25 supports the entire length of the sheet material. As a result, only the hard end of the thin plate material 2 is exposed to the roller 1.
It is leveled with a large diameter taper part 18.20 of 5.17,
--like elongation is given overall.

Contrary to the above, as a special case of edge elongation, edge elongation occurs only on one side when the hardness of the thin plate material is high except for one side of the width of the plate, or when the plate thickness is thick. In this case, a roller having a small-diameter tapered portion on the side where the end of the thin plate material with low hardness is located among the shape correction rollers, for example, the upper end of the thin plate material 2 as seen in FIG. 2 has low hardness. In this case, the rollers 15,17 are positioned so that their small diameter tapered portions 21,23 are over the ends of the sheet material, as shown in FIG. Position it so that it supports the entire length of the board. As a result, only the @ portion of the thin plate material 2 with low hardness is the roller 15.17.
It is leveled at the small-diameter taper portions 21 and 23, and a --like elongation is given to the whole.

In addition, if the width of the thin plate material 2 is different, each correction roller 1
5, 16.17 constant diameter roller part 24.25.26
By designing the length to match the maximum plate width, each roller can be moved in the axial direction according to the width of the thin plate material.
By appropriately adjusting the positions of the large diameter taper parts 18, 19, 20, the small diameter taper parts 21, 22° 23, or the roller parts 24, 25, 26, the above-mentioned medium diameter can be applied to thin sheets of various widths. Shape defects such as elongation and edge elongation can be corrected.

Furthermore, even if the width of the thin plate material 2 is constant, the degree of hardness distribution or thickness distribution of the thin plate material may differ, and the degree of mid-elongation or edge elongation may differ. By moving each shape correction roller 15, 16.17 in the axial direction according to Even for thin plate materials with different thickness distributions, shape defects such as mid-elongation or edge elongation can be corrected appropriately.

As described above, according to the tension leveler 1 of this embodiment, not only edge elongation but also mid-elongation can be effectively corrected, and it can also be applied to thin plate materials with various sheet widths and hardness distributions or thickness distributions. can also perform such shape modifications.

The accuracy of the flatness of a board is generally evaluated by the steepness of the wave height divided by the wave pitch. This steepness was about 0.5% because conventional tension levelers have little shape correction effect for poor mid-elongation. However, in this example, as described above, it has become possible to effectively correct mid-elongation defects in various thin plate materials, so the steepness of the thin plate material can be improved to 0.3% or less. was completed.

Typical application specifications of the above tension leveler will be described below.

The thin plates handled are often 0.1 to 1°2 thick and 600 to 1500 mm in width, and are made of other materials besides steel.
Various non-ferrous metals such as copper and aluminum are handled. For such a thin plate material, the diameter of each roller of the tension leveler 1 is approximately as follows. Bridle roller 5.6, 7.8
The diameter of the guide rollers 10, 13. is 600 to 900 rm.
14 and the diameter of the large diameter shape correction roller 17 is 150 to 25.
0 stop, the diameter of the extension rollers 11 and 12 is 15 to 30 mm, and the diameter of the small diameter shape correction rollers 15 and 16 is also 15 to 3011 mm.
It is about 1+.

Also, the large diameter tapered portion 1 of the shape correction rollers 15, 16, 17
The shape of 8.19.20 has a taper amount of 0505 to 0.1
5, the taper length is selected to be about 150 to 300 bites, and the same applies to the shapes of the small diameter taper portions 21, 22, and 23.

In the above embodiment, the rollers for shape correction such as middle elongation and edge elongation are the three shape correction rollers 15.1 on the exit side.
6.17, but it can also be incorporated into at least one of the shape correction rollers, preferably one on the final exit side, and in this case as well, as mentioned above, the hardness of only one side of the sheet width edge is It has a shape modification effect on special mid-elongation that occurs in high or thick thin plate materials.

Further, the shape-correcting roller of the present invention may be applied not only to the 11N13 shape-correcting rollers as in the above embodiment, but also to the rollers 14 and the like upstream thereof, thereby expanding its range.

Further, in the above embodiments, the shape correction roller of the present invention was applied to the shape correction rollers 15, 16, and 17 on the exit side. This is because the shape of the thin plate material is formed near the final roller. However, the shape correction roller of the present invention may be incorporated into a roller group upstream from the exit side shape correction roller, and even in this case, some shape correction effect can be obtained.

Furthermore, in the above embodiment, the large-diameter taper portion and the small-diameter taper portion have a linear taper shape, but the shape is not limited to this.
It may be a quadratic curve, a higher order curve, or a combination thereof.

In short, these tapered parts can have any tapered shape as long as the connection with the roller part having a constant diameter is made in a smooth shape without steps.

〔Effect of the invention〕

As is clear from the above, according to the tension leveler of the present invention, the roller group of the tension leveler is provided with at least one large-diameter tapered portion that gradually becomes thicker in diameter than the center portion of the barrel toward the end face of the barrel. Since one roller is incorporated,
The flatness of the thin plate material can be improved without causing shape defects during mid-elongation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the roller arrangement of a tension leveler according to an embodiment of the present invention, and FIG. 2 is a diagram showing the shape correction roller of the tension leveler viewed from above, showing defects in the shape of a thin sheet material due to elongation. This shows the arrangement for correcting the third
The figure is a partially sectional side view showing a moving device for the shape correction roller, FIG. 4 is an end view of the moving device, and FIG.
The figure is a diagram showing the arrangement of the same shape correction roller when correcting the end elongation shape defect of a thin plate material, and FIG. 6 is a diagram showing the arrangement of the same shape correction roller for a thin plate material whose shape does not need to be corrected. FIG. 7 is a diagram illustrating the arrangement of the same shape correction roller for a thin plate material that causes special elongation in the middle, and FIG. 8 is a diagram showing the arrangement of the same shape correction roller for a thin plate material that causes special edge elongation. Explanation of symbols 1...Tension leveler 2...Thin plate material 15.16
．． 17...Shape correction roller 18.19.20...Large diameter taper part 21.22.23...Small diameter taper part 24.25.26...Roller part 34...Moving device applicant Co., Ltd. Hitachi representative Patent attorney Yuzuru Haruhi Figure 5 Figure 6

Claims (6)

[Claims] (1) In a tension leveler equipped with a roller group that applies tension to a thin plate material and corrects the flatness of the thin plate material by bending and stretching the thin plate material, the roller group is directed toward one of the body end faces toward the body end surface. A tension leveler incorporating at least one roller having a large diameter tapered part whose diameter gradually becomes thicker than the center part of the body. (2) A plurality of rollers each having a large diameter tapered portion on one of the body ends are arranged such that the large diameter tapered portions are alternately located at both width ends of the thin plate material. A tension leveler according to claim 1. (3) The roller has a large-diameter tapered portion on one of its body ends, and a small-diameter taper portion whose diameter becomes gradually smaller than the center portion of the body toward the body end face on the other body end. A tension leveler according to claim 1 or 2. (4) Claims 1 to 3 are characterized in that a roll portion having a constant diameter and having a length equal to or greater than the width of the thin plate material is provided in the center of the body of the roller. Any one
Tension leveler as described in section. (5) The tension leveler according to any one of claims 1 to 4, wherein the roller is provided with a moving means for moving the roller in the axial direction. (6) The tension leveler according to any one of claims 1 to 5, wherein the roller is incorporated into a shape correction roller disposed on the exit side of the roller group. .