JPH04294813A - Preventing roll for buckling wave and wrinkle, etc., generated on passing extra thin metal strip and its use method - Google Patents

Abstract

PURPOSE:To pass an extra thin steel strip without generating various defects such as overlapping flaws and vertical wrinkles by preventing buckling being generated in the direction of the sheet width of the steel sheet which is passed under tension. CONSTITUTION:As regards method for using a wrinkle preventing roll 5 having an arcuately recessed section which increases the diameter in sequence from the middle symmetrically toward the end parts, the extra thin steel strip 6 passed under tension on the passing line is pressed by this preventing roll 5 and passed as it is pressed in from the passing line.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention prevents the appearance of buckling in the width direction of an ultra-thin metal strip that is passed under tension, and prevents not only buckling waves but also buckling waves. An ultra-thin metal strip defect prevention roll (hereinafter simply referred to as wrinkle prevention roll) that can pass sheets without producing defects such as folding flaws (simply called wrinkles), vertical wrinkles, and cross buckles caused by ) and the preferred method of using the roll.

0002

[Prior Art] In recent years, the demand for ultra-thin metal strips with a thickness of 0.3 mm or less and generally including foils of less than 0.1 mm has been increasing rapidly.・Stainless steel sheets used in the electronic technology field and the automobile industry, high N which is outside the composition range of this stainless steel
Ultra-thin metal plates such as i-containing steel plates and aluminum plates, in addition to the effective properties possessed by each plate itself as a material, are also thinner and have superior surface quality with a high-grade surface finish. is required. The manufacturing method for ultra-thin metal strips used in such fields generally uses a thin material, including already ultra-thin metal strips, as a starting material, which is then further subjected to cold rolling, temper rolling, tension rolling, and so on. The method used is to perform straightening and cutting along with bending to obtain the desired ultra-thin dimensions, as well as the desired qualities such as surface finish and mechanical properties.

In this method of manufacturing ultra-thin metal strips, a buckling phenomenon occurs in the width direction of the ultra-thin metal strip that is passed under tension during the manufacturing process, resulting in buckling waves. As a result, folding defects, vertical wrinkles, cross buckles, etc. may occur, but the conventional method for preventing the occurrence of such defects is described in the case of a rolling manufacturing process equipped with a reverse type rolling mill as shown in Figure 1. It will be briefly explained below. Examples of reverse rolling mills include the Sendzimir cold rolling mill with small-diameter rolling rolls and multistage rolls, various cluster cold rolling mills including this, and temper rolling mills with relatively large-diameter rolling rolls. There is. The ultra-thin metal strip 6 unwound from the ultra-thin metal strip coil C attached to the payoff/tension reel 2 provided on one side of the rolling mill 1 is passed between the rolling rolls 1a via the deflector roll 4. The rolling plate is then passed through a payoff/tension reel 3 via a deflector roll 4 provided on the other side of the rolling mill 1.
The work of winding the sheet is then completed, and one round of rolling is completed. During this rolling process, the ultra-thin metal strip 6 has the following properties:
A tension of about 10 to 70 kgf/mm2 is applied as a unit tension, although it depends on the material of the metal strip, dimensions including plate thickness, and the type of rolling machine suitable for the purpose of rolling. If there is insufficient rolling in one rolling pass, the rolling work is carried out by rolling the plate in the opposite direction to the direction of the rolling pass described above. The plate is reverse rolled repeatedly as necessary.

When rolling the ultra-thin metal strip 6 in this way, tension is applied to the ultra-thin metal strip 6 passed through the rolling mill 1, so that the ultra-thin metal strip 6 is The state is the same as that of a compressive force in the width direction of the plate, which is equivalent to the value obtained by multiplying the tension by Poisson's ratio.If the tension increases, of course, the thickness of the ultra-thin metal strip 6 becomes thinner. The wider the plate width becomes, the larger the slenderness ratio becomes, the buckling phenomenon appears in the plate width direction, and buckling waves as schematically illustrated in FIGS. 3 and 4 are more likely to occur. . As shown in FIG. 4, if the ultra-thin metal strip 6 with steep buckling waves (some parts may have already been buckled) is rolled between the rolling rolls 1a, the result will be as shown in FIG. As shown, defects observed in the form of folds or extended lines occur continuously on the surface after rolling. However, even under tension conditions where buckling waves that appear to be relatively gentle as shown in Figure 3 occur, depending on the tension conditions, including the front and rear tension states, folds, etc. may occur as shown in Figure 5. defects occur continuously. It is presumed that this occurs because buckling deformation occurs in the width direction of the metal strip when excessive tension is applied to the metal strip, which has been made extremely thin and has reduced rigidity. We have no choice but to let it happen and prevent it.

Furthermore, defects such as vertical wrinkles (including vertical wrinkle patterns) as shown in FIG. 6 and cross buckles (not shown), which are wrinkles diagonal to the rolling strip direction, are continuous on the surface after rolling. This may occur. These defects occur when a metal strip that has been made extremely thin and has reduced rigidity is rolled under tension conditions that are basically too low due to a change or collapse of the front-to-back tension balance. It is presumed that this is due to the buckling phenomenon that occurs because the restraining force of the metal strip in the vicinity is too low, so the only way to prevent this is to increase the proof strength to increase rigidity or to increase the tension to increase the restraining force. do not have. In order to roll the ultra-thin metal strip 6 in this way, the thinner the plate thickness and the wider the plate width, the more likely various defects will occur due to buckling in the width direction of the plate, and the tension during rolling must be increased. There is a problem in that various defects occur if the temperature is too high or too low, and it is very difficult to adjust them. Furthermore, the folds and streak-like defects that occur in the ultra-thin metal strip 6 explained using FIG. However, Figure 3
As shown in FIG. 4, when the ultra-thin metal strip 6 in which buckling waves have occurred is brought into contact with the rolls while being pulled and bent by the deflector rolls 4 and 4 to change direction, or when it is pulled and bent by the payoff and tension reels 2 and 3. However, there are also problems that occur when the material comes into contact with a reel or coil and is wound up, or when the material is similarly changed direction with a deflector roll or wound onto a reel in other manufacturing processes different from this rolling mill 1. Ta.

[0006] Conventionally, in order to prevent the occurrence of such defects such as folds and vertical wrinkles, as shown in FIG. A wrinkle prevention roll 5' having a cylindrical or convex crown shape is arranged between the deflector rolls 4, 4 and the payoff/tension reels 2, 3 on the rolling plate line of the ultra-thin metal strip 6. , a method has been implemented in which the ultra-thin metal strip 6 is pushed through the rolling strip line and restrained, whereby the strip is rolled while suppressing the occurrence of buckling.

However, even if the anti-wrinkle rolls 5' having the above-mentioned shape are placed at each predetermined position and the ultra-thin metal strip 6 is rolled, the anti-wrinkle rolls 5 whose shape is simply cylindrical are
In the case of ', the ultra-thin metal band 6 is restrained without generating buckling waves only for the part of the ultra-thin metal band 6 that is in contact with the anti-wrinkle roll 5' and a small length range near this part. Therefore, it was not possible to obtain a large defect prevention effect. In addition, in the case of the anti-wrinkle roll 5' having a convex crown shape, the ultra-thin metal strip 6 is threaded.
Although it has the effect of somewhat suppressing meandering in the direction perpendicular to the rolling direction, the effect of preventing the occurrence of various defects is the same as that of the wrinkle prevention roll 5' having a linear shape, and the effect is not as great. I couldn't.

[0008]

SUMMARY OF THE INVENTION The present invention eliminates the various deficiencies of the prior art, and provides a method for passing an ultra-thin metal strip with a thickness of 0.3 mm or less under tension. There are no folds or streak-like defects that are thought to be caused by excessive tension, and there are no vertical wrinkles or cross buckle defects that are thought to be caused by insufficient tension, which means that it is difficult to set and adjust the tension during sheet threading. Various defect prevention rolls (wrinkle prevention The task is to provide a method for using the role (role) and how to use it.

[0009]

[Means for Solving the Problem] As a result of intensive research in order to solve the problem, the present inventor has developed a method for ultra-thin metal strips that are threaded under tension on various threading lines. The use of a roll to prevent wrinkles, etc., which is formed in a shape with a concave section with an arcuate cross section whose diameter increases sequentially from the center to the ends symmetrically, and how to use such a roll is to prevent ultra-thin sheets during threading. The metal strip can be passed through the sheet by being pressed by such a roll and pushed through the sheet passing line, and furthermore, as a method of using such rolls for reverse rolling, rolling between the rolling rolls of a rolling mill and each deflector roll is possible. Rolling is performed by pressing with such rolls arranged at predetermined positions between the threading lines and/or between the rolling threading lines between each deflector roll and each payoff/tension reel, and pushing the rolling threading line from each rolling threading line. If you pass the plate,
The ultra-thin metal strip is not only restrained by these wrinkle prevention rolls, but also tensile loads are applied to both sides of the strip width, making it possible to prevent buckling caused by compressive force directed toward the center of the strip width. This not only prevents folds and streak-like defects due to buckling, but also eliminates the need to reduce the tension applied to the ultra-thin metal strip in order to prevent such defects. They completed the present invention by discovering that it is possible to prevent defects such as vertical wrinkles and cross buckles caused by insufficient binding force.

That is, in order to carry out the above-mentioned method of the present invention, as shown in FIG. A prevention roll 5 is prepared. The shape of the wrinkle-preventing roll 5 having a concave portion having an arcuate cross section is, for example, such that the diameter Dc at the center is 0.0000000000000000000000000000000000000000000000000000.
85 to 0.99 times, and it is possible to present a shape that forms a sine curve from the center to the ends, with the center being 0 degrees and the ends being 90 degrees. Specifically, it is preferable that the shape is formed according to the following general formula. [General formula] Dx=aDo・sin(πx/L) (1)
However, Dx: Roll diameter at any distance x from the roll end (mm) Do: Roll end diameter (roll base diameter) (mm) L:
Roll length (roll length in effective shape) (mm) x: Arbitrary distance from the roll end in roll length L (mm) a: Ratio of roll diameter difference, a = 0.01 to 0. 15(
degreeless finite number)

[0011]Then, the roll 5 for preventing such wrinkles, etc.
As described in detail above with reference to FIG. It may also be placed in a threading line in the manufacturing process for processing metal strips. For example, a wide ultra-thin metal strip, which will be explained in the examples below, may be annealed and/or descaled, or trimmed on both sides, then wound on a reel while changing the threading direction with a deflector roll, or further stretched and bent. It is also preferable to arrange the sheet in a general threading line where the sheet is corrected in shape while being rolled and wound on a reel. In this way, whether it is an ultra-thin metal strip that is rolled along a rolling strip line or an ultra-thin metal strip that is threaded along a strip threading line in various general manufacturing processes, For example, the rollers are arranged so as to be driven by a cylinder so that they can be pushed out of the rolling plate line or the plate threading line and rolled or passed through the plate, and then pushed and released after the plate passing is completed. Moreover, the placement position of the wrinkle prevention roll 5 is such that the tension applied to the ultra-thin metal strip is the greatest, and the ultra-thin metal strip does not come into contact with rolls, reels, etc. and is restrained. It is preferable to place the plated at a location where the distance is long (specifically, between the locations of rolls, reels, etc.), and furthermore, the locations where defects such as those described above directly occur are located at the front and rear of the rolls and reels where they occur. It is preferable that the position be as close to the roll or reel as possible.

More specifically, when the wrinkle prevention roll 5 is placed in a rolling manufacturing process equipped with a reverse type rolling mill as shown in FIG. It is installed between the rolling strip line and the deflector roll that changes the direction of threading of the ultra-thin metal strip toward the reel. It can be installed between the rolling strip line between a deflector roll and a rolling roll to change the strip passing direction, or between the rolling strip threading line between a deflector roll and a payoff/tension reel on the exit or entry side of a rolling mill. In some cases, it may be installed. In other words, when the rolling mill 1 is a reverse rolling mill that rolls an ultra-thin metal strip 6 by passing it back and forth, the rolling mill 1 has a rolling roll 1a and deflector rolls 4 and 4 on both sides of the rolling mill 1, as shown in FIG. It is preferable to arrange it between the rolling strip line between the deflector rolls 4, 4 and the payoff/tension reels 2, 3. The type of reverse rolling mill generally used in the process of rolling the ultra-thin metal strip on which the wrinkle-preventing roll 5 is arranged is not particularly limited, and for example, a normal two-stage or four-stage rolling mill is used. A type rolling mill or a multi-stage rolling mill such as a cluster rolling mill such as a Sendzimir rolling mill may be used. Further, there is no limit to the rolling ratio of the ultra-thin metal strip, and the method of the present invention can be carried out by ordinary cold rolling or temper rolling.

[0013]

[Function] The method of using the roll according to the present invention to prevent buckling waves, wrinkles, etc. that occur in ultra-thin metal strips during sheet threading is as follows: The metal strip is pressed by a roll formed in a shape having a specific concave portion, and the strip is threaded so that the ultra-thin metal strip on the threading line wraps around the roll of this specific shape by a predetermined appropriate amount. This is a method of threading the sheet by pushing it in from the line. As shown in FIG. 7, when the wrinkle prevention roll pushes the ultra-thin metal strip 6 through the sheet passing line, the ultra-thin metal strip 6 has low rigidity and flexibility, so the cross-section becomes as shown by the solid line in the figure. It is tightly wrapped around the outer circumferential surface of the roll 5, which is formed into a concave shape. In this state, when the roll 5 rotates, for example, 90 degrees in the direction of the arrow, following the passing of the ultra-thin metal strip 6, point A at the edge of the ultra-thin metal strip 6 comes to point A'. Since there is friction between the contact surfaces of the ultra-thin metal strip 6 and the roll 5, the edge portion of the ultra-thin metal strip 6 that came into contact with the roll 5 at point A remains attached to the roll 5 and reaches point A', so the ultra-thin metal The edge of the band 6 is at the position indicated by the dotted line indicated by point A'. The edge of the ultra-thin metal strip 6 that has moved to point B is exactly the same as point B.
' The position will be as shown by the dotted line. As this roll 5 continues to rotate, such positional movement is repeated, so that the ultra-thin metal strip 6 has the effect of gradually moving toward the larger roll diameter, and thus toward both ends of the roll 5. arise. In other words, the wrinkle-preventing roll 5 is formed in a shape having a concave section whose diameter increases symmetrically from the center toward the ends, so that the ultra-thin metal strip 5
A tensile force is applied to the ultra-thin metal strip 6 in the width direction (toward both edges) by a component of the force acting tangentially around the roll axis of the rotating roll 5.
Since the appearance of the buckling phenomenon described above is suppressed and prevented, not only buckling waves but also folds and streak-like defects do not occur, and as a result, the ultra-thin metal strip does not have buckling or In order to prevent various defects caused by this from occurring, there is no longer a need to reduce the applied tension to a particularly low level, so defects such as cross buckles, where vertical wrinkles or diagonal wrinkles occur due to insufficient binding force due to too low tension. There will be no need for this to occur.

As described above, the wrinkle prevention roll 5 can be either a non-rotation drive type that rotates following the passing of the ultra-thin metal strip 6 or a rotation drive type to achieve the above-mentioned functions and effects. It is good because it plays well, but in any case, it is unnecessary to have a structure that reduces GD2 by making the diameter and weight as small as possible, or a structure in which the roll outer cylinder rotates via a bearing on the outer periphery of the roll shaft to reduce GD2. This is preferable because it does not cause contact flaws. Furthermore, the diameter of the roll 5, the type and extent of the specific recess formed on the outer peripheral surface in the longitudinal direction of the roll axis, the winding angle (°) of the ultra-thin metal strip 6 of the roll 5, and the shape of the roll 5 for that purpose. The amount of pushing into the ultra-thin metal strip 6 (mm) and the placement position of the roll 5 within the threading line are determined based on the target ultra-thin metal strip 6.
This will vary depending on the type and scale of the manufacturing process equipped with manufacturing equipment for sheet threading, and the purpose of preventing various defects that occur during the manufacturing process. All you have to do is set it comprehensively.

Specifically, the various settings mentioned above depend on the dimensions of the ultra-thin metal strip, including not only its thickness but also its width, the flexibility and shape of the ultra-thin metal strip, the purpose of processing the ultra-thin metal strip, etc. There are differences in the tension applied to the ultra-thin metal strip that is threaded and processed depending on the processing purpose, its quality grade, and the type and scale of the manufacturing process equipped with the manufacturing equipment, as well as the extent of its fluctuation. Depending on the distance for free threading without being constrained, the cause and source (location) of various defects that occur during the manufacturing process, the purpose and degree of prevention of such defects, etc. In order to prevent this, settings should be made in a manner that is comprehensively most efficient and effective, taking into account various knowledge and experience values obtained through repeated experience.

[0016]

[Example] Example 1 In a skin pass rolling manufacturing process equipped with a reverse rolling mill as shown in Fig. 1,
1 as a unit tension (unit tension) for SUS304 stainless steel strip with a plate width in the range of 600 to 1250 mm.
As a result of skin-pass rolling of a large number of applicable coils by applying a force of 0 to 30 kgf/mm2, it was found that when conventional wrinkle prevention rolls with a cylindrical or convex crown shape were used, the inlet side of the rolling roll of the rolling mill The stainless steel strip generates buckling waves and flaps, folding into the rolling rolls, and continuous vertical wrinkles occur on the exit side of the rolling rolls, making winding difficult and making it impossible to perform good and stable temper rolling. Although there were many cases, the barrel length was 1300mm, the diameter of the end (Do
) is 150 mm, the diameter (Dc) at the center is 140 mm, and the wrinkle prevention roll is shaped to form a sine-curved recess symmetrically from the center to the edge with an angle of 0 degrees at the center and 90 degrees at the ends. In order to ensure that the winding angle of the steel strip on the prevention roll is in the range of 5 to 45 degrees, the payoff and tension between the rolling roll of the rolling mill and the deflector rolls on both sides of the rolling strip line, and between the deflector roll and both sides of the roll, is further maintained. When the ultra-thin metal strip is placed on the rolling line between the reel and the ultra-thin metal strip is pushed through each rolling line and rolled, there are no folds or vertical wrinkles in the rolled ultra-thin metal strip. We were able to produce an ultra-thin metal strip that is a stainless steel strip that has been heat-finished to a good quality and has no defects such as buckles or cross buckles.

Example 2 In a cold rolling manufacturing process equipped with a reverse rolling mill as schematically illustrated in FIG.
A large number of corresponding coils were applied to a stainless steel strip or a high Ni-containing steel strip with a plate width of 600 to 1250 mm in the range of 40 to 70 kgf/mm2 as a unit tension. As a result of performing reverse cold rolling, strip-like defects and cross buckles occurred before and after the rolling rolls of conventional rolling mills due to poor tension settings, rapid fluctuations, and large fluctuations, but the results were good and stable. There were cases where cold rolling could not be carried out, but depending on the material and dimensions of the steel strip to be rolled, the model and scale of the rolling mill, etc., the barrel length was 1300 mm and the end diameter (Do) was 1.
00 to 300 mm, and the roll diameter difference ratio a is 0.01 to 0.08 according to the general formula (1), and the shape is numerically controlled to have a concave portion whose diameter increases symmetrically from the center to the end. An anti-wrinkle roll formed by polishing with a roll grinder is placed between the rolling strip line of the rolling mill and the deflector rolls on both sides of the roll, and the rolled steel strip is removed from each rolling strip line. When the steel strip was pressed and cold-rolled, it was possible to produce an ultra-thin metal strip that was a rolled steel strip of good quality and free from the above-mentioned defects.

Embodiment 3 A slitter device 7a having round cutters, a looping pit 7b, and a deflector roll 7 as schematically shown in FIG.
c. In a slitter line 7 equipped with a tension reel 7d for winding an ultra-thin metal strip cut into multiple strips and an ultra-thin metal strip 6 with side trimming on both edges, the plate thickness is 0.
．． The plate width is 600 to 1050 in the range of 0.05 to 0.2 mm.
3 to 10 kgf/mm as a unit tension for stainless steel strips and high Ni-containing steel strips in the range of mm.
As a result of side-trimming only both edges of a large number of corresponding coils and winding them onto the tension reel 7d while applying a tension of 2, the coils sit on the corresponding steel strips that are conventionally located on the threading line between the deflector roll 7c and the tension reel 7d. Not only bending waves occur, but defects in the form of extended streaks or extended streaks may occur, but according to the general formula (1), the ratio a of the roll diameter difference is in the range of 0.05 to 0.15. The barrel length is 1300mm, the end diameter (Do) is 80mm,
This deflector roll 7c is a wrinkle prevention roll 5 having a center diameter (Dc) of 70 mm and having a shape that forms a sine-curved recess symmetrically from the center to both ends, with the center being 0 degrees and the ends being 90 degrees. It is placed on the threading line with the tension reel 7d and as close as possible to the steel strip coil C to be wound on the tension reel 7d, taking into account the thick coil diameter of the steel strip coil C to be wound. When the steel strip 6 was rolled up while being pushed through the sheet threading line, it was possible to wind it as an ultra-thin metal strip coil C of good quality without any of the above-mentioned defects.

Embodiment 4 As schematically shown in FIG. 9, a straightening device 8a, a pinch roll 8b, a deflector roll 8c, a tension reel 8d, etc. are provided, and an extremely thin metal strip is stretched and bent to change its shape. In the shape correction line 8 to be corrected,
The plate thickness is in the range of 0.05~0.2mm, and the plate width is 600~
3 to 10 kg as unit tension for stainless steel strips and high Ni-containing steel strips in the range of 1050 mm.
As a result of correcting the shape of a large number of applicable coils while applying a tension of f/mm2 and winding them onto the tension reel 8d, various defects may occur as shown and explained in FIG. A wrinkle prevention roll 5 of a similar shape was arranged at a similar position, and the steel strip 6 before winding was rolled while being pushed through the threading line. It was possible to wind up a high-quality ultra-thin metal strip coil C.

[0020]

Effects of the Invention As detailed above, the roll for preventing buckling waves, wrinkles, etc. generated in an ultra-thin metal strip during threading according to the present invention and its method of use are as follows: The ultra-thin metal strip to be threaded onto the threading line was pressed and pushed through the threading line using a wrinkle-preventing roll formed with a concave section with an arcuate cross-section whose diameter increases sequentially. By making it possible to thread the sheet in this state, it is possible to apply a tensile force to stretch the ultra-thin metal strip in the width direction (both edge directions) during the sheet threading.
When manufacturing ultra-thin metal strips while performing various processing treatments, various effects are achieved as listed below.
Its industrial value is extremely large.

(1) Buckling waves and buckling deformation caused by excessive tension in the threading direction applied to the ultra-thin metal strip are prevented,
Since various defects such as folding scratches that occur in ultra-thin metal strips can be eliminated, yield is improved. (2) In order to prevent buckling that occurs in the width direction of the ultra-thin metal strip, it is not necessary to reduce the tension applied in the threading direction of the ultra-thin metal strip, so it is applied in the threading direction. Since defects such as vertical wrinkles and cross buckles that occur due to insufficient tension can be avoided, ultra-thin metal strips of good quality can be stably manufactured, and the yield is further improved. (3) In areas where it was difficult to prevent defects such as creases, vertical wrinkles, and cross buckles, which occurred under any of the contradictory tension conditions, the plate thickness was reduced to 0.
．． Since it is possible to roll very thin and wide ultra-thin metal strips such as foils of 3 mm or less, especially 0.1 mm or less, or to perform processing other than rolling, this application is not limited to the field of rolling metal strips. , has made a major contribution to industrial fields such as electricity and electronics. (4) It can be implemented in conventional rolling equipment by simply changing the anti-wrinkle roll, and can also be implemented in other equipment by installing it as a device with a simple mechanism equipped with the roll, so equipment costs are low and it is economical. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing a state in which a rolling strip-threading method according to the present invention for preventing buckling waves and various defects occurring in an ultra-thin metal strip during threading is carried out in a reverse rolling mill.

FIG. 2 is an explanatory front view showing one example of the wrinkle prevention roll according to the present invention.

FIG. 3 is an explanatory diagram locally showing buckling waves in an ultra-thin metal band that are generated due to excessive tension applied in the sheet passing direction.

[Fig. 4] An ultra-thin metal strip with steep buckling waves (or buckling) caused by excessive tension applied in the threading direction is rolled down between rolling rolls or comes into contact with a deflector roll or payoff/tension reel. FIG. 4 is an explanatory diagram of a process that leads to defects such as folds and scratches.

FIG. 5 is an explanatory diagram showing a state in which folds (defects) occur on the exit side of a rolling roll of a rolling mill due to excessive tension applied in the sheet passing direction.

[Fig. 6] The tension applied in the strip threading direction is basically too low, including loss of balance in the front and rear directions bordering the rolling rolls of the rolling mill, resulting in vertical wrinkles (defects) on the exit side of the rolling roll bite. ) is an explanatory diagram showing a state in which this occurs.

FIG. 7 is an explanatory diagram showing a state in which a tensile force is generated in the width direction of the ultra-thin metal strip that is wound around the wrinkle prevention roll and passed through the strip according to the present invention.

FIG. 8 is an embodiment diagram in which the wrinkle prevention roll according to the present invention is placed in a slitter line and used when side trimming only both edges of an ultra-thin metal strip and winding the roll.

FIG. 9 is an embodiment diagram in which the wrinkle prevention roll according to the present invention is placed in a forming and straightening line and is used when stretching and bending an ultra-thin metal strip and winding it up.

[Explanation of symbols] 1 Rolling mill 1a Rolling roll 2 Payoff and tension reel 3 Payoff and tension reel 4 Deflector roll 5 Wrinkle prevention roll 5' Conventional wrinkle prevention roll 6 Ultra-thin metal strip 7 Slitting line 7a Rotating circle Slitter device 7b with blades Looping pit 7c Deflector roll 7d Tension reel 8 Shape correction line 8a Shape correction device 8b that performs stretching and bending processing Pinch roll 8c Deflector roll 8d Tension reel C Ultra-thin metal strip coil

Claims (4)

[Claims] 1. Buckling that occurs in an ultra-thin metal strip during threading, characterized in that it is formed in a shape having a concave portion with an arcuate cross section whose diameter increases sequentially from the center to the ends symmetrically. A roll to prevent waves and wrinkles. 2. The recess according to claim 1, wherein the recess has an arcuate cross-section whose diameter gradually increases symmetrically from the center toward the ends, and is formed in accordance with the following general formula: A roll that prevents buckling waves and wrinkles that occur in ultra-thin metal strips during threading. [General formula] Dx=aDo・sin(πx/L) However, Dx: Roll diameter at an arbitrary distance x from the roll end (mm) Do: Roll end diameter (roll base diameter) (mm) L:
Roll length (roll length in effective shape) (mm) x: Arbitrary distance from the roll end in roll length L (mm) a: Ratio of roll diameter difference, a = 0.01 to 0. 15(
degreeless finite number) 3. An ultra-thin metal strip that is threaded under tension on a threading line is formed into a shape having a concave portion having an arcuate cross-section whose diameter gradually increases symmetrically from the center toward the ends. A method of using a roll to prevent buckling waves, wrinkles, etc. occurring in an ultra-thin metal strip during sheet threading, which is characterized in that the sheet is threaded by being pressed with a roll that is pushed in from the sheet threading line. [Claim 4] One payoff and tension reel (
The ultra-thin metal strip (6) unwound from the ultra-thin metal strip coil (C) attached to Using a reverse rolling mill (1) that performs reverse rolling with rolling rolls (1a), when performing reverse rolling and threading while applying tension to the ultra-thin metal strip (6) along the rolling threading line, the rolling Ultra-thin metal strip (6)
is formed in a shape having a concave portion having an arcuate cross section whose diameter increases sequentially from the center to the ends symmetrically, and between the rolling strip line between the rolling roll (1a) and the deflector rolls (4, 4) and / or deflector roll (4,
4) and the payoff/tension reel (2, 3) are pressed by each roll placed at a predetermined position between the rolling strip lines, and are pushed through each rolling strip line to roll the strip. A method of using a roll to prevent buckling waves and wrinkles occurring in an ultra-thin metal strip during reverse rolling.