JPH10128439A - Method for coiling metal strip and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely improve an end mark of a coil caused on the step difference of the top end part of a metal strip with a simple device and to improve the yield of the produce by pre-recessing over the total width on the front face or front and back faces of the metal strip at the turning position of the metal strip at the turning position of the circumference lapped with the top end part of the metal strip. SOLUTION: Plural numbers of recessing devices (for example, die 7) are arranged on a line and at the same time of shearing, these device machine the metal strip. Or while measuring the length of sheet by using a sheet length meter 8, plural places are machined also sufficiently with a single recessing device. The shape of groove is preferably made in an arbitrarily smooth shape, however if its radius of curvature is made too small, the part is bent locally in the winding time and the end mark is promoted, so that radius of curvature of the recess is made preferably mire than 100mm. The depth of recess h, the radius of curvature r and the thickness of the metal strip t are shown as its preferable relation of 0.1×t<=h<=0.4×t, r>=100mm (in the case of machining only front face or back face), etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end mark and a top mark which are formed on a metal band after the first winding due to a step at a leading end when winding a metal band such as a cold rolled steel plate or a stainless steel plate in a coil shape. The present invention relates to a metal strip winding technique for preventing a bending defect referred to as "bending defect".

[0002]

2. Description of the Related Art When a metal strip is wound on a reel, a bending defect due to a step in the thickness of the leading end occurs over several to several tens of turns from the beginning of the winding of the metal strip. The bent portion does not disappear even if the film is rewound, and is cut off as a defective portion, thereby lowering the yield (hereinafter, this broken defect is referred to as an end mark). As a conventional technique for preventing the end mark, the following method is disclosed.

Technology for processing the end of a metal band to reduce the level difference (1) A method of rolling thinly by a certain length from the front end of a metal band winding. (2) A machine in which the leading end of a metal band is wound into a tapered shape by a swaging roll. (The actual opening 52-38139
(3) A metal band is wound into a tapered shape by a grinder. (Japanese Utility Model Application Laid-Open No. 56-131991) (4) A taper-shaped cutting process of a winding end portion of a metal band. (Japanese Patent Application Laid-Open No. 63-237858) Technology for Inserting a Buffer Material (1) A device in which a buffer material such as a corrugated cardboard is inserted and wound in a range where the tip of a metal band overlaps the second roll (Japanese Patent Laid-Open No. 59-1019)
Gazette, Japanese Patent Laid-Open No. 5-337542,
No. 100834) Technology for imparting a step absorption function to a winding rubber sleeve (1) A method in which a gripper is provided on a rubber sleeve to enclose the tip of a metal band. (2) A method using a rubber sleeve having a depression at the position where the tip of the metal band hits. (3) A rubber sleeve having a soft portion at a position where the tip of the metal strip hits. (Japanese Patent Application Laid-Open No. 5-285540) These conventional techniques have the following problems, and the problem of the end mark has not been completely solved. In other words, in the above-described technology for processing the tip of the metal band into a tapered shape, it is desirable to process the tip of the metal band as sharply as possible to reduce end marks. Cheap. Further, if the tip is sharpened by grinding or the like, the tip pierces the rubber belt or the rubber sleeve of the belt wrapper and breaks them.

[0004] The above-described technique of inserting a cushioning material requires a complicated automatic device for attaching the cushioning material to a predetermined position of the metal strip, and a device for removing the cushioning material is required in the next step.

The technique of using a rubber sleeve having a gripper, a dent, or a soft portion at the position where the front end of the metal band hits the head is not limited to the case where the sleeve position is adjusted to the front end of the metal band at the beginning of winding, but before and after the winding tension is established. And the tip position shifts.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the method of preventing end marks when winding a metal band, and to provide a simple and reliable method and apparatus.

[0007]

The main point of the present invention is to smooth a coil projection when winding a reel in winding a metal band such as a cold rolled steel plate. There are two inventions, a method of processing before winding on a reel and a method of processing after winding.

The details are as follows.

1. Method and apparatus for processing before winding (1) At the orbiting position of the metal band overlapping with the front end of the metal band in the state of being wound around the reel, the front surface, the back surface, or the front and back surfaces of the metal band are subjected to indentation over the entire width in advance and wound. A method for winding a metal band, comprising:

(2) The sectional shape of the recessed portion is formed by a smooth curve, and the depth h and the radius of curvature r satisfy the following conditions. (1) The method for winding a metal band according to the item (1).

0.1 × t ≦ h ≦ 0.4 × t: In the case of processing only the front or back surface 0.05 × t ≦ h ≦ 0.2 × t: In the case of processing the front and back surfaces r ≧ 100 mm where t is the thickness of the metal band. It is.

(3) When a plurality of recesses are formed,
The method for winding a metal band according to the above mode (2), wherein the depth h of the depression satisfies the following condition.

0.1 × t / I ≦ h: In the case of processing only the front surface or the back surface 0.05 × t / I ≦ h: In the case of processing of the front and back surfaces, where I is the number of locations where dent processing is performed.

(4) One or more indentation devices are installed upstream of the metal band cutting device, and the installation position is such that a distance L from the metal band cutting device is represented by the following equation. Metal strip winding device.

L = NπD where N is an integer of 1 or more, and D is a reel diameter. Method and apparatus for processing after winding (1) A method for winding a metal band, which comprises grinding a projection after the first winding caused by overlapping with the tip of the metal band at the time of winding.

(2) The height of the grinding process is represented by the following equation. (1) The method for winding a metal band according to the item (1).

0.3 × t ≦ h ≦ 0.6 × t (3) When performing grinding with a plurality of windings, the height of the grinding is represented by the following equation.
(2) The method for winding a metal band according to the item (2).

0.3 × t / J ≦ h where J is the number of times of grinding.

(4) A grinding mechanism provided near the reel, and a mechanism for bringing the grinding tool of the grinding mechanism into contact with the coil of the metal band and moving the grinding tool in the axial direction of the reel to grind the coil surface. Characteristic metal strip winding device.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the end mark has a projection at the first turn and thereafter due to a thickness step at the tip.
The metal band on the outer periphery is broken. In the present invention, attention has been paid to the point that if the local protrusion of the coil is eliminated in the initial stage of winding, the end mark thereafter can be prevented.

There are two types of the method of the present invention. One is a method of processing into a metal band before winding, and the other is a method of processing after winding.

First, the first method will be described. As shown in FIG. 2, this method uses several meters to several tens of meters from the tip of the metal strip.
The recess is machined at the orbital position that overlaps with the leading end, and as shown in FIG. 3, at the stage where the recessed portion 5 overlaps with the stepped portion and further the convex portion of the outer winding layer, the outer peripheral side is smoothed. How to

The protruding amount of the convex portion caused by the step portion at the front end is one tenth to one tenth of the plate thickness. It has been found that by performing the indentation processing for canceling this slight overhang, the end mark of the metal band can be prevented with a small amount of indentation.

Since the diameter of the reel is usually constant, the distance between the cutting device (shear) and the processing device is made equal to the circumference of the reel, and by cutting with the shear at the same time as the indentation, the processed portion is just at the tip end when winding. It overlaps with the step.

The depression is not limited to one place. As described later, when it is not convenient to increase the depth of one recess, the effect may be obtained at a plurality of locations. Strictly speaking, in the second and subsequent rounds, dent processing should be performed at the position corrected by the thickness of the winding. However, since the processing range is at most about 5 windings, the processed part and the tip position of the metal band are not so large. It does not shift. Therefore, the second and subsequent rounds may be processed at positions that are integral multiples of the reel circumference.

As a device, as shown in FIG. 4, a plurality of indentation processing devices (for example, dies 7) may be arranged on a line, and processed by these devices simultaneously with the shear cutting, or as shown in FIG. While measuring the plate length using the plate length meter 8, processing may be performed at a plurality of locations by one processing apparatus.

If the indentation processing device cannot be installed at an appropriate position upstream of the shear (the distance from the shear to the circumference of the reel) due to the problem of equipment space, the tip of the metal band is shear-cut, and the metal band feeding amount is measured. The indentation processing may be stopped by stopping the relative position between the indentation device and the tip end position of the metal strip to a predetermined length (an integral multiple of the perimeter).

There is an appropriate range for the processing depth h of the depression. If it is too deep, the tip will hang down when passing through the line, it will be difficult to handle in the next process, or it may break when it is wound around the reel and tension is applied, so it is too deep Can not. If it is too shallow, there is no effect. Therefore, it is desirable to be within the range of 0.1 × t ≦ h ≦ 0.4 × t (in the case of processing only the front or back surface) and 0.05 × t ≦ h ≦ 0.2 × t (in the case of processing the front and back surfaces).

When the thickness of the metal strip is large, the processing load (pressing force, grinder cut amount, etc.) becomes considerably large. Therefore, the depth of the depression per one place is reduced, and the same effect is aimed at by a plurality of turns. You may. Also, in the case of thick materials,
If the depth of the depression is too large, the processed portion may be completely bent at the time of winding, which may promote the end mark. In this case, the same effect may be aimed at by making the depth of the depression per one place small and making it into a plurality of turns.

That is, in such a case, the lower limit of the depth h may be increased.

0.1 × t / I ≦ h (in the case of processing only the front surface or the back surface) 0.05 × t / I ≦ h (in the case of processing of the front and back surfaces) where I is the number of locations where dent processing is performed.

The shape of the recessed portion may be any smooth shape. However, if the radius of curvature is too small, the portion is locally bent at the time of winding and promotes an end mark. The radius of curvature is desirably 100 mm or more.

When the recessed surface is machined on the front side, there is an advantage that it is easy for an operator to see and there is little possibility of overlooking when a defective portion is inspected. The metal band is wound up and down at any time, and it is more desirable to form depressions on both sides from the viewpoint of management.

The processing method includes cutting with a cutting tool, grinding with a grinder, pressing with a die, and the like. Die processing does not have the problem of chip processing, but is limited to materials that are relatively thick and easily processed. Selection of cutting method or grinding method depends on the material, dimensions,
The selection should be made in consideration of the chip processing method, machine accuracy and other conditions.

Next, the second method will be described. In this method, as shown in FIG. 6A, after winding, a convex portion is ground. Although it is desirable to remove the protrusions from the first roll, the number of turns necessary for establishing the tension of the reel and the installation position of the grinder are limited as shown in FIG.
In some cases, it is necessary to process the convex portions after the winding.

The processing height h is 0.3 × t ≦ h ≦ 0.6 ×
t is preferred. That is, in the processing after winding the reel, even if the coil surface is seemingly flat at the first and second turns, the projection may become apparent when the winding tension is established. Therefore, it is preferable to perform the grinding process to the extent that the recess is formed. The height of this processing is 30
If not, the end mark may be generated.

On the other hand, since the processing is performed after the winding of the reel, there is little problem of the passing plate handling, and the processing can be performed deeper than the processing before the winding. However, if the processing is too deep, there is a possibility that the processing may be broken when the winding tension rises. Considering safety, it should be limited to about 60% of the plate thickness.

The position to be processed is positioned at the orbital position corresponding to the tip position of the metal band. However, since the reel and the metal band often slip, positioning cannot be performed by the rotation angle of the reel shaft. Therefore, as shown in FIG. 8, the feed length after shear cutting is measured by the plate length meter 8, and stopped at the position of a + NπD (N is the number of windings) to remove the convex portion.

In the process of removing the convex portion after winding,
Due to the mechanical relationship between the processing device and the reel, it is difficult to employ a press method or a cutting method, and a grinding method is suitable.

This grinding apparatus has a moving mechanism 93 in the reel axis direction as shown in FIG. 7, and grinds over the entire width while abutting against the coil 3 by the pressing actuator 92.

In the grinding after winding, the processing is not limited to one place.

In any case, according to the present invention, since the tip portion is processed in 1 to 5 turns (generally 3 turns or less), there is a problem that this portion cannot be used as a product. However, the inner peripheral side of the coil is not a final product at the place where the crane lifting tool hits, so that if it is about 1 to 3 turns, there is practically no major problem.

[0043]

【Example】

(Example 1) The following test was conducted for a method of processing before winding.

The test material was a cold-rolled steel strip (yield point 28 kgf / mm
² , board width 1000mm, thickness 0.8mm, 2.3mm, 3.2m
m).

The winding conditions were as follows: rubber sleeve thickness: 50 mm coil inner diameter: φ508 mm coil outer diameter: φ1900 mm winding tension: 3 kgf / mm ² .

As shown in FIG. 9A, one side was subjected to press working with a curvature radius of 150 mm by changing the depth h on one side by a die press. Further, as a comparative example, a steel strip not processed was wound under the same conditions as above.

The coil after winding was rewound and the length of the end mark from the end of the steel strip that could be confirmed was measured. In the comparative example, the length with the end mark is 5 when the plate thickness is 0.8 mm.
It was 120 m when the thickness was 0 m and the thickness was 2.3 mm, and 180 m when the thickness was 3.2 mm.

Table 1 shows the ratio of the end mark occurrence length of the example of the present invention to the end mark occurrence length of the comparative example. As can be seen from Table 1, the processing depth h is 10 times the plate thickness t.
%, The length of the end mark is 1/10 or more, or 10 m or more. Therefore, h must be 10% or more of t. If the processing depth h is 40% or more of the plate thickness, the bending at the processed portion becomes sharp, and the end mark is rather promoted.

The plate thickness is 0.8 mm, 2.3 mm, 3.2 mm
In the above, when the processing depth was set to 20% of the plate thickness and the radius of curvature of the die was changed, when the radius of curvature was 100 mm or less,
When the thickness was 3.2 mm, the end portion was broken at the processed portion, and the effect of reducing end marks was reduced. Therefore, the radius of curvature is 100 mm
The above is desirable.

[0050]

[Table 1]

Next, as shown in FIG. 9 (b), a test was performed in which the dies were changed and recesses were formed on both sides of the steel strip. The test conditions are the same as described above.

Table 2 shows the ratio of the end mark occurrence length (e) of the embodiment of the present invention to the end mark occurrence length (E) of the comparative example.

As is clear from Table 2, when the processing depth h is 5% or more of the plate thickness and the end mark generation length is 1/10 or less or 10 m or less, the processing depth is greater than this. Is necessary.

[0054]

[Table 2]

Next, a winding test was performed under the same conditions as described above, except that an iron sleeve was used instead of the rubber sleeve. In the comparative example, the length of the end mark is, for example, 100 m when the plate thickness is 0.8 mm and 23 when the plate thickness is 2.3 mm.
In the case of 0 m and a plate thickness of 3.2 mm, it was 280 m.

Table 3 shows the ratio of the end mark occurrence length of the embodiment of the present invention to the end mark occurrence length in the comparative example. When the iron sleeve is used without the hollowing, the length of the end mark is twice or more than that of the rubber sleeve. When the indentation was performed, the length of the end mark was reduced to the same level as the rubber sleeve even with the iron sleeve.

If the processing depth h is 10% or more of the plate thickness t, the length of the end mark is 1/10 or less.
% Is desirable.

[0058]

[Table 3]

(Embodiment 2) Next, an embodiment of a method of grinding after winding will be described.

The cold-rolled steel sheet, rubber sleeve, tension conditions, etc. used in the test are the same as in Example 1. After winding the coil by 1.5 turns, the convex portion of the coil formed at the tip of the steel strip was ground by changing the grinding amount h. As a comparative example, a cold-rolled steel strip without grinding was wound under the same conditions as described above.

The coil after winding was rewound, and the length of the end mark from the end of the steel strip at which the end mark could be confirmed was measured. In the comparative example, the end mark length is 50 m when the plate thickness is 0.8 mm,
The thickness was 110 m when the thickness was 2.3 mm, and 120 m when the thickness was 3.2 mm.

Table 4 shows the ratio of the end mark occurrence length of the embodiment of the present invention to the end mark occurrence length of the comparative example. As can be seen from the figure, the machining depth h is 30 times the plate thickness t.
%, The generated length of the end mark becomes 1/10 or less, or 10 m or less. Therefore, h must be 30% or more of t.

If the grinding depth exceeds 60%, there is a portion that is over-ground due to poor flatness of the steel sheet, and holes or cuts are formed. .

[0064]

[Table 4]

Next, a winding test was performed by attaching an iron sleeve instead of the rubber sleeve. In the comparative example, the end mark generation length was 100 m when the plate thickness was 0.8 mm, 110 m when the plate thickness was 2.3 mm, and 250 m when the plate thickness was 3.2 mm. Table 5 shows the ratio of the end mark length of the embodiment of the present invention to the end mark generation length. In the case of the iron sleeve without grinding, the length of the end mark was twice or more. However, when the grinding was performed, the improvement was as good as that of the rubber sleeve.

When the processing depth h is 30% or more of the plate thickness, the length of the end mark occurrence is 1/10 or less of the case without grinding. Therefore, h should be processed to 30% or more of the plate thickness. is there.

[0067]

[Table 5]

[0068]

According to the present invention, the end mark of the coil caused by the step at the tip of the metal strip can be reliably improved with a simple device, and the product yield is improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an occurrence state of an end mark.

FIG. 2 is a diagram illustrating a principle of forming a depression in a metal band.

FIG. 3 is a diagram illustrating a principle of suppressing the generation of an end mark according to the present invention.

FIG. 4 is a diagram showing an arrangement of a recess processing device of the present invention.

FIG. 5 is a view showing another example of the arrangement of the indentation processing device of the present invention.

FIG. 6 is a principle view of processing a convex portion after winding according to the present invention.

FIG. 7 is a schematic view of an apparatus for processing a convex portion after winding according to the present invention.

FIG. 8 is a schematic view of a method for processing a convex portion after winding according to the present invention.

FIG. 9 is a diagram illustrating types of depressions to be processed before winding according to the present invention.

[Explanation of symbols]

 1: Metal strip 2: Reel 3: Coil 4: End mark 5: Processing part 6: Shear 7: Die 8: Plate length meter 9: Rotating grindstone of grinding machine

Claims (8)

[Claims] 1. A metal, wherein the metal band is wound around a front end, a back side, or both sides of the metal band in advance at a position around the metal band overlapping with a front end portion of the metal band in a state of being wound around a reel. How to wind up the belt. 2. The metal strip according to claim 1, wherein the cross-sectional shape of the processed portion of the recess is formed as a smooth curve, and the depth h and the radius of curvature r satisfy the following conditions. Winding method. 0.1 × t ≦ h ≦ 0.4 × t: In the case of processing only the front surface or the back surface 0.05 × t ≦ h ≦ 0.2 × t: In the case of processing the front and back surfaces r ≧ 100 mm where t is the thickness of the metal band. 3. The method of winding a metal band according to claim 2, wherein the depth h of the depression satisfies the following condition when performing the depression processing at a plurality of locations. 0.1 × t / I ≦ h: In the case of processing only the front surface or the back surface 0.05 × t / I ≦ h: In the case of processing the front and back surfaces, where I is the number of locations where the dent processing is performed. 4. A metal cutting machine wherein one or more indentation devices are installed on the upstream side of the metal band cutting device, and the installation position is such that a distance L from the metal band cutting device satisfies the following condition. Strip winding device. L = NπD, where N is an integer of 1 or more, and D is a reel diameter. 5. A method for winding a metal band, comprising: grinding a projection after the first winding caused by overlapping with a front end of the metal band at the time of winding. 6. The method according to claim 5, wherein the height of the grinding process satisfies the following condition. 0.3 × t ≦ h ≦ 0.6 × t 7. The method according to claim 6, wherein the height of the grinding process satisfies the following condition when the grinding process is performed a plurality of times. 0.3 × t / J ≦ h where J is the number of times of grinding. 8. A grinding mechanism provided near a reel, and a mechanism for bringing a grinding tool of the grinding mechanism into contact with a coil of a metal band and moving the grinding tool in the axial direction of the reel to grind the coil surface. Metal strip winding device.