JP2003245716A - Device for winding metal strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of a topmark by a simple constitution. <P>SOLUTION: A sheet-like flexible sleeve 6 composed of a more flexible material than a metal made sleeve 5 to wind a steel strip 2 mounted on the periphery of a mandrel 4 is provided in the periphery of the metal made sleeve 5 so as to prevent the generation of the topmark formed by the transcription of the tip shape of the steel strip 2 caused by the overlapping of the steel strip 2 of a second winding and after on the tip in the longitudinal direction of the wound steel strip 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal band winding device capable of suppressing a top mark generated when winding a metal band.

[0002]

2. Description of the Related Art A steel strip, which is a type of metal strip, is rolled, for example, and then wound by a winding device provided on the delivery side of the rolling device. The mandrel, which is provided in the winding device and winds the steel strip around its circumference, is made of metal and hardly deforms elastically.
Due to the tension applied to the steel strip by the winding device, the longitudinal end portion of the steel strip is pressed between the steel strip and the mandrel which are wound on the distal end portion. The second and subsequent steel strips overlap with the front end of the steel strip wound in this way, so that a so-called top mark is formed by transferring the front end shape of the steel strip.

The top mark formed on the inner winding side of the coiled steel strip is not limited to the second roll of the steel strip.
Even if the number of turns is increased, it may be formed by several tens of turns, and the length may reach several hundred meters. The top mark formed on the steel strip rarely leads to plastic deformation and remains in a transferred pattern in many cases, but since it impairs the appearance of the product, it is treated as poor quality. Therefore, it is desired to suppress the generation amount of top marks and improve the yield.

[0004]

As a conventional technique for suppressing the generation of top marks, a rubber sleeve is attached to the outer periphery of a mandrel, and a steel strip is wound around the rubber sleeve. In the prior art using a rubber sleeve,
When the steel strip is wound around the outer circumference of the rubber sleeve and tension is applied, the rubber sleeve elastically deforms, and the tip shape of the steel strip is absorbed by the elastically deformed portion of the rubber sleeve. The leading end of the strip is prevented from being pressed by the rolled steel strip with a strong force to suppress the generation of the top mark.

However, in the case of rolling a thin steel strip which requires a large rolling force with respect to the rolling rate, the rolling steel strip is shaped in order to reduce the rolling force of the rolling apparatus. To improve, for example, 15-7
Rolling is performed with a high tension of 0 kgf / mm ² being applied to the steel strip. When such a high tension is applied to the steel strip, if the steel strip is wound around the outer circumference of the rubber sleeve, the deformation of the rubber sleeve will not be limited to the part corresponding to the tip of the steel strip, but will be greatly deformed as a whole. Or, the tension applied to the steel strip fluctuates undesirably, and the accuracy of the thickness of the rolled steel strip deteriorates and the shape deteriorates. In addition, the coil inner diameter may contract due to the tightening of the coil, which may make it difficult to remove the coil from the mandrel.

Therefore, when a steel strip is rolled under a high tension, the steel strip is wound directly on the outer periphery of the mandrel, or a metal sleeve that is hardly deformed even when a force is applied is used. In reality, it is inevitable to deal with the problems of thickness accuracy and shape by mounting the steel strip around the outer circumference of the metal sleeve and winding the steel strip around the outer circumference of the metal sleeve. When the steel strip is wound around the outer circumference of the mandrel or the outer circumference of the metal sleeve, the top mark is generated on the rolled steel strip as described above. The problem is to suppress the occurrence.

An object of the present invention is to provide a metal band winding device capable of suppressing the generation of top marks with a simple structure.

[0008]

SUMMARY OF THE INVENTION The present invention is a metal band winding device for winding a metal band around a metal sleeve mounted on the outer periphery of a mandrel, the sheet being made of a softer material than the metal sleeve. -Shaped soft material suppresses the generation of a top mark formed by transferring the tip shape of the metal band by overlapping the second and subsequent metal bands on the lengthwise end of the wound metal band. As described above, the winding device for a metal band is provided on the outer circumference of the metal sleeve.

According to the present invention, a soft material is provided on the outer periphery of the metal sleeve, and when tension is applied to the metal strip,
Since the shape of the front end of the metal band is absorbed by the elastic deformation of the soft material, the pressing force on the second and subsequent wound metal bands can be reduced, so that the generation of the top mark can be suppressed. In addition, the core on which the soft material is provided has a metal sleeve that is hardly deformed even when a force is applied, and the metal band is substantially wound on the metal sleeve. Even when high tension is applied, it is possible to prevent undesired tension fluctuation.

Further, the present invention is characterized in that the soft material is wound around the outer circumference of the metal sleeve so as not to cause a step.

According to the present invention, the seams of the sheet-shaped soft material wound around the metal sleeve in the circumferential direction are cut so that the soft materials do not overlap with each other and no gap is formed. It is possible to prevent a step from being formed in the soft material. By thus providing the soft material on the outer circumference of the metal sleeve so as not to cause a step, it is possible to prevent the top mark from being generated by the soft material.

The present invention is also characterized in that the soft material has a spring hardness (Hs) defined by Japanese Industrial Standard (JIS) K 6301 of 40 or more and 85 or less.

According to the present invention, the soft material is selected in a range of suitable hardness, and therefore, when the winding tension is applied to the metal strip, the soft strip is appropriately elastically deformed so as to have a tip shape of the metal strip. To suppress the generation of the top mark, and there is no risk of damage due to pressing of the metal band or friction with the metal band.

According to the present invention, the thickness t1 of the soft material is
More than 4.5 times the thickness t2 of the metal strip (t1 ≧ 4.5 × t
It is characterized by being selected in 2).

According to the invention, the soft material has a thickness t1.
Is selected to be at least 4.5 times the thickness t2 of the metal strip. As a result, the soft material has a sufficient thickness for elastic deformation, so that when the winding tension is applied to the metal strip,
By elastically deforming, the tip shape of the metal band can be reliably absorbed and the generation of the top mark can be suppressed.

Further, the present invention is characterized in that the soft material is vinyl chloride. According to the invention, the soft material is realized by vinyl chloride. Vinyl chloride is suitable for use as a soft material because it has suitable hardness, is easily available in sheets of various thicknesses, and is inexpensive.

[0017]

1 is a perspective view showing a simplified structure of a metal band winding device 1 according to an embodiment of the present invention, and FIG. 2 is a metal band winding device shown in FIG. FIG. 3 is a perspective view showing a state where the metal strip 2 of the device 1 is wound up. A metal strip winding device 1 (hereinafter, simply referred to as “winding device 1”) of the present embodiment is provided on the outlet side of a rolling device for rolling a steel strip 2, which is one type of metal strip, and is rolled. It is a winding device 1 that winds a steel strip 2 into a coil.

The winding device 1 comprises a device body 3, a mandrel 4 rotatably supported by the device body 3 at one end in the axial direction, a metal sleeve 5 mounted on the outer periphery of the mandrel 4, and a metal sleeve. And a soft material 6 provided on the outer circumference of the sleeve 5. The apparatus main body 3 is provided with an electric motor (not shown) that is a drive source for rotationally driving the mandrel 4.
The mandrel 4 has, for example, a gear attached to one end supported by the apparatus body 3, and is rotated by an electric motor via the gear.

The metal sleeve 5 is made of cast iron, for example, and has a cylindrical shape. The mandrel 4 is provided with a plurality of segments 7 (four in the present embodiment) that are circumferentially arranged at intervals in the outer layer in the radial direction. Segment 7
Is configured so that it can be moved in the radial direction of the mandrel 4 by expansion / contraction means (not shown). By retracting the expansion / contraction means, the segment 7 moves inward in the radial direction and the outer diameter of the mandrel 4 becomes smaller, so that the mandrel 4 can be inserted into the metal sleeve 5. After inserting the mandrel 4 into the inside of the metal sleeve 5, by extending the expanding and contracting means,
Since the segment 7 moves radially outward and the outer diameter of the mandrel 4 increases, the metal sleeve 5 can be attached to the mandrel 4. Metal sleeve 5
When detaching from the mandrel 4, the segment 7 is again moved inward in the radial direction to reduce the outer diameter of the mandrel 4.

A sheet-shaped soft material 6 made of a softer material than the metal sleeve 5 is provided on the outer periphery of the metal sleeve 5. FIG. 3 is a partially enlarged sectional view showing a state where the steel strip 2 is wound around the metal sleeve 5 provided with the soft material 6. For the soft material 6, a material having a spring hardness (Hs) defined by JIS K 6301 of 40 or more and 85 or less, for example, vinyl chloride is preferably used. The thickness t1 of the soft material is 4.5, which is the thickness t2 of the steel strip 2 to be wound.
It is selected so as to be more than twice (t1 ≧ 4.5 × t2).
The hardness and the thickness t1 of the soft material 6 are limited as described above for the following reason.

Hardness is the most important characteristic in selecting the soft material 6. When the spring hardness Hs exceeds 85,
When tension is applied to the wound steel strip 2, the soft material 6 cannot be sufficiently elastically deformed, so that the shape of the tip portion 8 of the steel strip 2 cannot be absorbed and the top mark is generated. The ability to suppress is reduced. On the other hand, when the spring hardness Hs is less than 40, the strength of the soft material 6 itself decreases, and when a tension is applied to the rolled steel strip 2, the tip 8 of the steel strip 2 presses against the soft material 6. As a result, the soft material 6 may be damaged due to friction between the soft material 6 and the steel strip 2. Therefore, the spring hardness Hs is set to 40 to 85.

The thickness t1 of the soft material 8 is another important factor to be noted in selecting the soft material 6. The thickness t1 of the soft material 6 is less than 4.5 times the thickness t2 of the steel strip 2 (t
When 1 <4.5 × t2), when tension is applied to the rolled steel strip 2 and the tip 8 of the steel strip 2 is pressed against the soft material 6, the soft material 6 is elastic in the thickness direction. Since the thickness is not sufficient for deformation, the tip shape of the steel strip 2 cannot be reliably absorbed. Therefore, the thickness t of the soft material 6
1 is 4.5 times or more the thickness t2 of the steel strip 2 (t1 ≧ 4.5 ×
t2). Note that if the thickness t1 of the soft material 6 is excessively thick, handling such as detaching operation with respect to the metal sleeve 5 becomes difficult and the price of the soft material 6 becomes high. Therefore, the upper limit of the thickness t1 of the soft material 6 is It is preferably about 6 times the thickness t2 of the strip 2.

The soft material 6 selected for the spring hardness Hs and the thickness t1 as described above is wound around the outer circumference of the metal roll 5 in the following manner. A sheet-shaped soft material 6 is wound in the circumferential direction of the metal sleeve 5, and when the outer circumference of the metal sleeve 5 is wound once, the soft material 6 is placed so that the soft materials 6 do not overlap each other and a gap is not formed. Cut to form seam 9. The soft material 6 is prevented from coming off the metal sleeve 5 by, for example, sticking a thin adhesive tape 10 or the like to the formed seam 9 portion. By thus providing the soft material 6 on the outer circumference of the metal sleeve 5 so as not to cause a step, it is possible to prevent the top mark from being generated by the soft material 6. At this time, the width w1 of the soft material 6 is the width w2 of the steel strip 2 to be wound.
Larger than (w1> w2). The reason for this is to prevent the widthwise end portion of the soft material 6 from marking the shape of the widthwise end portion of the soft material 6 on the steel strip 2. Further, by mounting the soft material 6 on the metal sleeve 5 with an adhesive tape or the like, it is possible to easily replace the soft material 6 when the soft material 6 is deteriorated by winding the steel strip 2.

FIG. 4 is a schematic sectional view showing the vicinity of the tip portion 8 of the steel strip 2 wound on the metal sleeve 5 provided with the soft material 6. When tension is applied to the steel strip 2 wound on the metal sleeve 5 provided with the soft material 6 and the tip 8 of the steel strip 2 is pressed against the soft material 6, the soft material 6 moves inward in the radial direction. The recess 11 is formed by elastic deformation. The recess 11 formed in the soft material 6 absorbs the tip shape of the steel strip 2 and reduces the force with which the tip 8 of the steel strip 2 is pressed against the wound steel strip 2. The occurrence of top marks in the band 2 is suppressed.

(Examples) Examples of the present invention will be described below.

The winding device 1 was prepared on the exit side of the rolling device, and the rolled steel strip 2 was wound up. In the embodiment, sheet-shaped vinyl chloride is used as the soft material 6 around the outer circumference of the cast iron sleeve 5 mounted on the mandrel 4 of the winding device 1 so as not to cause a step, and the seam 9 of the soft material 6 formed. The adhesive tape 10 was adhered and fixed on. In this way, the rolled steel strip was wound around the outer circumference of the soft material 6 provided on the cast iron sleeve 5. The spring hardness Hs of vinyl chloride used as the soft material 6 is 80, and the thickness t1
Is 1.0 to 1.5 mm, and the thickness t of the steel strip to be wound is
It was 5 to 6 times 2. In the comparative example, the steel strip after direct rolling was wound around the outer circumference of the cast iron sleeve 5.

That is, the state where the top mark is generated in the rolled steel strip is compared between the case where the soft material 6 is provided on the outer circumference of the cast iron sleeve 5 and the case where the soft material 6 is not provided by the example and the comparative example.

To evaluate the effect of suppressing the generation of top marks, the length of generated top marks was measured by rewinding the steel strip after winding, and the length of generated top marks was used as an index.
Here, the generation length of the top mark is the length cut off from the steel strip because it cannot be commercialized because the top mark is formed on the wound steel strip.

The top mark generation rate, which is a percentage of the length of the top mark generated with respect to the length L of the steel strip, was calculated, but the generation of the top mark is not affected by the length of the steel strip. The tip shape of the strip is determined by how many turns are transferred on the inner winding side of the wound steel strip, so we decided to evaluate the effect of suppressing the top mark generation by the length of the top mark generation described above. .

Sample No. which is an example. The evaluation results of the steel strips 1 to 7 are shown in Table 1, and the sample No.
Table 2 shows the evaluation results of the steel strips 11 to 19. Tables 1 and 2 show the thickness of the steel strip t1, the width w2 of the steel strip, the length L of the steel strip, and the steel length, together with the length of the top mark generated, which is an index of the effect of suppressing the top marks in the examples and comparative examples. The band weight wt and the occurrence rate of the top mark are also shown for reference.

Example Sample No. The generation length of the top marks in the steel strips 1 to 7 was in the range of 30 to 150 m, and the average value thereof was 112 m. On the other hand, comparative sample No.
The generation length of the top mark in the steel strips 11 to 19 is
The range was 285 to 490 m, and the average value was 374 m. Comparing the example and the comparative example by the average value of the generated length of the top mark, the generated length of the top mark of the example is only 30% of the generated length of the top mark of the comparative example. Is provided on the outer circumference of the cast iron sleeve 5 and the steel strip is wound up to reduce the amount of top marks generated by 70%.
Has also been realized.

[0032]

[Table 1]

[0033]

[Table 2]

As described above, in this embodiment, the soft material is vinyl chloride, but the soft material is not limited to this, and any soft material satisfying the spring hardness (Hs) of 40 to 85 can be used. It can be applied as a material. Although the metal strip 2 is a steel strip, it is not limited to this and may be another metal strip such as a copper alloy strip.

[0035]

According to the present invention, a soft material is provided on the outer periphery of a metal sleeve, and when tension is applied to the metal band, the shape of the tip of the metal band is absorbed by elastic deformation of the soft material and wound. Since it is possible to reduce the pressing force applied to the inner winding side of the taken second and subsequent metal strips, it is possible to suppress the generation of top marks. In addition, the core on which the soft material is provided has a metal sleeve that is hardly deformed even when a force is applied, and the metal band is substantially wound on the metal sleeve. Even when high tension is applied, it is possible to prevent undesired tension fluctuation.

Further, according to the present invention, by providing the soft material on the outer circumference of the metal sleeve so that no step is formed, it is possible to prevent the top mark from being generated by the soft material.

Further, according to the present invention, since the soft material is selected in the range of suitable hardness, when the tension for winding is applied to the metal strip, it is appropriately elastically deformed so that the tip of the metal strip is appropriately deformed. The shape is absorbed to prevent the generation of top marks, and there is no risk of damage due to pressing of the metal band or friction with the metal band.

Further, according to the present invention, the thickness t1 of the soft material is selected to be 4.5 times or more the thickness t2 of the metal strip. As a result, the soft material has a sufficient thickness for elastic deformation, so that when the winding tension is applied to the metal band, the soft material elastically deforms to reliably absorb the tip shape of the metal band and thus the top mark. Can be suppressed.

Further, according to the present invention, the soft material is realized by vinyl chloride. Vinyl chloride is suitable for use as a soft material because it has suitable hardness, is easily available in sheets of various thicknesses, and is inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view showing a simplified configuration of a metal strip winding device 1 according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the metal band 2 of the metal band winding device 1 shown in FIG. 1 is being wound.

FIG. 3 is a partial enlarged cross-sectional view showing a state where the steel strip 2 is wound around the metal sleeve 5 provided with the soft material 6.

FIG. 4 is a schematic cross-sectional view showing the vicinity of a front end portion 8 of a steel strip 2 wound around a metal sleeve 5 provided with a soft material 6.

[Explanation of symbols]

1 Winding device 2 steel strip 4 Mandrel 5 Metal sleeve 6 Soft material 7 segments

Claims (5)

[Claims] 1. A winding device for a metal band, which winds a metal band around a metal sleeve mounted on the outer periphery of a mandrel, wherein a sheet-shaped soft material made of a material softer than the metal sleeve is wound. The outer circumference of the metal sleeve is formed so as to suppress the generation of a top mark formed by transferring the tip shape of the metal band by overlapping the metal band of the second and subsequent turns on the lengthwise end of the formed metal band. A winding device for a metal band, which is provided on the. 2. The winding device for a metal band according to claim 1, wherein the soft material is wound around the outer circumference of the metal sleeve so as not to cause a step. 3. The soft material is Japanese Industrial Standard K630.
The spring hardness (Hs) specified in 1 is 40 or more, 8
5. The winding device for a metal strip according to claim 1, wherein the winding amount is 5 or less. 4. The thickness t1 of the soft material is at least 4.5 times the thickness t2 of the metal strip (t1 ≧ 4.5 × t).
The winding device for a metal band according to any one of claims 1 to 3, which is selected in 2). 5. The winding device for a metal strip according to claim 1, wherein the soft material is vinyl chloride.