JP5386938B2 - Winding the metal strip - Google Patents

Description

The present invention relates to an inner diameter paper tube to be attached to a coil inner diameter of a metal band and a winding method of the metal band to the inner diameter paper tube, in particular, when winding a soft and thick metal band into a coil, it relates winding method Rukin genus band it is possible to prevent the occurrence of the reel mark (top mark) at the coil inner diameter part.

  For example, when a metal strip such as a steel strip is wound on a take-up reel (tension reel) to form a coil, the “reel mark” or the It is known that a linear unevenness defect in the plate width direction, which is called “top mark”, occurs. Further, due to poor maintenance of the tension reel, a step is generated between the segments constituting the reel, and as a result, an uneven defect called a “segment mark” may occur. Furthermore, the same defect may occur when a user attaches a coil to a rewinding reel (payoff reel) and rewinds it. (Hereinafter, the above defects are collectively referred to as “reel marks”.)

  Since the amount of distortion of the concave and convex defects as described above is slight and is usually reduced by plastic deformation when being molded into a member, there is almost no problem in practical use. However, some steel strips (cold-rolled steel strip, hot-rolled steel strip, surface-treated steel strip) used for automobile bodies, etc., like automobile roofing materials (roof materials) and truck loading platform gate panels, There are some which are used for members which require a beautiful appearance and have an extremely small amount of strain introduced by molding such as press molding of 5% or less. In the steel strip used for the member which receives only mild processing as described above, since the amount of processing strain is small, even if the leveler is passed through, the uneven defect remains as it is. Moreover, even if it becomes difficult to see the irregularity defect after processing, it may come out in subsequent painting. For this reason, steel strips used for such applications are strongly demanded not to generate not only normal surface defects but also reel marks.

  In general, reel marks are more likely to be generated when the steel strip to be wound is softer or thicker, and the material of the steel strip may be hardened or the thickness may be reduced. This is effective in preventing reel marks. However, from the viewpoints of moldability such as springback and product design, the means of hardening the material and reducing the plate thickness are practically impossible to implement. Therefore, it is desired to develop a winding technique that does not easily generate a reel mark even if the steel strip is soft or thick.

As a method for solving the reel mark, for example, a recess is provided in the tension reel, a coil tip is inserted into the recess, and the reel mark is improved by reducing the overlap of the coil tip group, and a rubber sleeve is provided on the tension reel. There is known a method of mounting or winding a steel strip by providing a shallow depression or step on the rubber sleeve (see, for example, Patent Documents 1 and 2). However, with these methods, although a certain degree of effect can be obtained, a sufficient effect is not necessarily obtained. Also, there is a problem that it is impossible to deal with a reel mark generated when the user rewinds.
Japanese Patent Laid-Open No. 06-016341 Japanese Utility Model Publication No. 01-096214

  Therefore, a method has been proposed and implemented in which a steel or paper tubular sleeve is attached to the take-up reel, a steel strip is wound around this to form a coil, and the coil is shipped as a product coil while the sleeve is attached to the inner diameter of the coil. Yes. However, since the steel sleeve is hard and the paper sleeve is only a simple cylinder, it has a certain effect on improving the segment mark, but it has a sufficient effect on the reel mark. I can't get it.

An object of the present invention is to propose a winding method of effective metals bands to prevent the reel mark and segment marks generated in the coil inner diameter of the metal strip.

  Inventors repeated examination for the solution of the said subject by making a steel strip whose yield stress is 300 Mpa or less and plate | board thickness is 1.0 mm or more into winding object. As a result, when a rubber layer is provided on the outer periphery of the paper sleeve, a lasing cut portion having an appropriate dimension is provided at one location of the rubber layer, and the tip of the steel strip is wound around the paper sleeve. Thus, the present inventors have found that it is extremely effective to correct the shape of the metal band tip to prevent the occurrence of reel marks, thereby completing the present invention.

That is , the present invention is a paper tube that is inserted into the inner diameter of a coil of a metal band, and has a rubber layer on the outer peripheral surface, and the thickness of the metal band is 2 at one place on the outer peripheral surface of the rubber layer. A coil is formed by winding a metal strip around the outer periphery of an inner diameter paper tube having a vertical wall portion with a step of 5 times or more and a taper portion having an outer peripheral length of 10 mm or more in the paper tube axis direction. A metal band winding method, wherein the tip of the metal band to be wound is bent and deformed to be equal to or less than the radius of curvature of the outer periphery of the inner diameter paper tube, and then the tip of the metal band whose shape has been corrected is provided on the rubber layer. A metal band winding method is proposed, wherein the metal band winds up after coming into contact with the cut portion and then starts winding up the metal band.

  The winding method of the present invention is characterized in that the length of the shape correction portion at the tip of the metal strip is equal to or longer than the length in the outer peripheral direction of the cut portion from the tip of the coil.

  Also, the winding method of the present invention is such that after the front end portion of the shape-corrected metal strip is brought into contact with the cut portion of the rubber layer of the inner diameter paper tube, the front end portion is fixed to the rubber layer with an adhesive tape, and then the metal strip. The winding is started.

The winding method of the present invention is characterized in that the inner diameter paper tube has a paper portion thickness of 10 to 30 mm and a rubber layer thickness of 2 to 5 mm.
The metal strip in the winding method of the present invention is a steel strip having a yield stress of 300 MPa or less and / or a plate thickness of 1.0 mm or more.

  According to the present invention, the reel mark generated in the inner diameter portion of the metal band (steel band) coil can be reduced and the generation length can also be reduced, so that the product quality of the member having a small amount of processing distortion, the product yield can be improved, and Any reduction in inventory can be realized.

  In examining the solution of the above-described problem, the present invention limits the sleeve material to paper. The reason is that the steel sleeve is hard and unsuitable for preventing the occurrence of reel marks. Therefore, the method of reducing the reel mark was studied limited to the paper sleeve (paper tube). As a result, when winding the metal band, a rubber layer serving as a cushioning material is provided on the outer peripheral surface of the paper tube, and a re-shaped cut portion is provided in one place on the outer peripheral surface of the rubber layer in the paper tube axial direction. The present invention has been completed by finding that it is necessary to correct the shape of the tip of the metal strip while using the inner diameter paper tube.

  FIG. 1 schematically shows a cross-sectional view of an inner diameter paper tube according to the present invention, in which 1 is a paper sleeve (paper tube), 2 is a rubber layer, and 3 is a re-shaped cut portion. . The paper tube 1 is required to have a certain thickness in order to ensure the strength of the wound coil, to be unaffected by the shape of the winder side, and to prevent segment marks. The thickness is preferably 20 mm or more. However, even if the thickness of the paper tube is excessively thick, the above effect is saturated and the manufacturing cost of the paper tube only rises. Therefore, the upper limit is preferably about 30 mm. The paper quality as the material of the sleeve is preferably cardboard or compressed paper.

  The method for holding the rubber layer 2 on the paper tube is not particularly specified. For example, the rubber layer 2 may be obtained by winding a sheet rubber around the outer peripheral surface of the paper tube and pasting it with an adhesive. What fixed the part with the stapler etc. may be used. However, when an adhesive is used, it is preferable to apply the adhesive as smoothly as possible so that there is no unevenness due to uneven application of the adhesive. Further, instead of using a plate-like rubber, a cylindrical rubber may be integrally formed and fitted to a paper tube. Moreover, the thickness of the rubber layer 2 is 2.5 times or more the plate | board thickness of the metal strip (steel strip) to wind from the necessity of providing the function as a shock absorbing material and providing the notch part mentioned later. Therefore, when winding a steel strip having a plate thickness of 1.0 mm or more, the thickness of the rubber layer is preferably 2.5 mm or more. However, if the thickness of the rubber layer becomes too thick, the effect as a cushioning material is saturated and not only difficult to wind, but also the manufacturing cost increases, so the upper limit is preferably about 5 mm. The rubber material is preferably natural rubber (NR) or nitrile rubber (NBR) that is oil resistant to rust-preventing oil. Further, the hardness of the rubber is preferably about 40 to 70 Hs as measured by JIS K6301 in order to obtain an effect as a buffer material.

Next, a description will be given of the ladle cut portion 3 provided at one place of the rubber layer.
The cut portion 3 is composed of a vertical wall portion 31 that is perpendicular to or close to the outer peripheral direction and a taper portion 32 adjacent thereto, and the tip portion of the metal band that has been shape-corrected in advance when starting winding of the metal band. , The reel mark is prevented from being generated due to the overlapping step at the front end portion. In order to obtain the above function, the step between the vertical wall portion 31 and the tapered portion 32 needs to be 2.5 times or more the plate thickness of the metal strip to be wound. This is because if the level difference is less than 2.5 times the thickness of the steel strip, the rubber layer cannot sufficiently serve as a cushioning material when the rubber layer is compressed and deformed by the winding tension of the steel strip. When the thickness of the rubber layer is 2.5 times the plate thickness of the metal strip and the step is 2.5 times the plate thickness of the steel strip, the contact between the vertical wall portion 31 and the taper portion 32 is reduced. The rubber layer thickness is 0, but it may be.

  Moreover, it is preferable that the taper part 32 is 10 mm or more in the length (namely, width W of a notch part) of the outer peripheral direction of a rubber layer. If the length of the taper portion is less than 10 mm, even if the metal band tip is brought into contact with the cut portion and winding is started, there is not a little slip between the metal band and the inner diameter paper tube. This is because there is a possibility that the effect of reducing the reel mark may not be obtained because the band tip portion is detached from the cut portion. Note that the upper limit of the length of the tapered portion (the width W of the cut portion) is not particularly limited from the viewpoint of reel mark prevention, but if it is too long, it is difficult to form the tapered portion in the rubber layer. Or the strength of the rubber layer of the taper portion is reduced, and is preferably about 20 mm. More preferably, it is the range of 10-15 mm.

  The taper portion 32 may be eliminated, and the cut portion 3 may be a groove having a width W of 10 to 15 mm and a depth of 2.5 times or more the thickness of the steel strip to be wound. In this case, it is preferable in that the groove processing is easy and there is no restriction on the winding direction of the metal band, but there is a disadvantage that the contact at the corner of the groove (latent contact) becomes strong and a break mark is easily generated. Therefore, it is necessary to consider the advantages and disadvantages.

Next, a method for winding a metal strip according to the present invention will be described taking a steel strip as an example.
In the winding method of the metal strip of the present invention, when the steel strip is wound around the outer periphery of the inner diameter paper tube, after correcting the shape of the tip of the steel strip to be wound below the radius of curvature of the inner periphery of the inner diameter paper tube, The tip of the steel strip whose shape has been corrected is brought into contact with a notch provided in the rubber layer, and then the winding of the steel strip is started.

  The reason for performing the shape correction is as follows. The inner diameter paper tube is cylindrical, whereas the metal strip is a flat plate. For this reason, if the leading end portion of the metal strip is wound around the inner diameter paper tube as it is, the leading end of the metal strip is warped outward in the radial direction of the inner diameter paper tube, which promotes the generation of reel marks. In view of this, it is intended to prevent the occurrence of reel marks by curving in a direction along the outer peripheral surface of the inner diameter paper tube (inward in the radial direction). The range of the tip portion of the steel strip to be bent is preferably equal to or greater than the length in the outer peripheral direction of the cut portion provided in the rubber layer, that is, the width of the cut portion. In addition, there is no restriction | limiting in particular in the upper limit of the length of a shape correction part, However, It is preferable to set it as about 300 mm from the point of the work load of shape correction.

  Further, the radius of curvature when the tip portion is curved needs to be at least smaller than the radius of curvature of the outer periphery of the inner diameter paper tube, and more preferably is equal to or smaller than the radius of curvature of the outer periphery of the take-up reel. When the steel strip is wound around the inner diameter paper tube by making the radius of curvature less than the outer radius of the inner diameter paper tube, the tip end closely adheres to the outer peripheral surface of the inner diameter paper tube, so that the leading end portion that causes the reel mark is overlapped. It is because it is reduced. Although there is no particular limitation on the method of correcting the shape of the tip portion, for example, a method in which the tip of a metal strip is sandwiched between jigs and wound around the outer circumference of a cylindrical or columnar jig having a radius smaller than the radius of curvature of the outer circumference of the inner diameter paper tube Is preferred. The radius of curvature of the winding jig is preferably determined in consideration of the spring back of the metal strip.

  As described above, when starting winding of the metal strip, the tip of the metal strip usually slips with the inner diameter paper tube and abuts against the notch portion in order to wind up while applying tension. The tip of the metal strip that has been removed may come off the notch. In order to prevent this, it is preferable to fix the tip of the metal band to the rubber layer with an adhesive tape or the like when the tip of the metal band contacts the notch.

  It should be noted that the reel mark is hard to be generated in a metal band that is hard and thin. Therefore, the winding method of the present invention is preferably applied to a soft or thick metal strip that easily generates reel marks. Specifically, the yield stress is 300 MPa or less and / or the plate thickness is 1.0 mm. It is suitable to apply to the above steel strip. The steel strip includes cold-rolled steel sheets, hot-rolled steel sheets, and surface-treated steel sheets obtained by subjecting them to hot dip plating, electroplating, coating treatment, and the like.

  The length of the reel mark generated at the inner diameter of the coil when winding an SPCC-class general cold rolled steel plate (yield stress: 250 MPa) with a thickness of 1.0 mm on a 20 inch (508 mmφ) tension reel is taken up. The conditions were investigated by changing whether or not the inner diameter paper tube was used, whether or not the inner diameter paper tube rubber layer was used, and whether or not the shape of the coil tip was corrected. The inner diameter paper tube used for winding the coil had a paper tube portion thickness of 25 mm, a rubber layer thickness of 3 mm, and a cut portion taper portion length (width W) of 12 mm. Moreover, the shape correction of the steel strip tip was performed by winding a range of 200 mm from the tip along a shape correction jig having an outer diameter of 500 mmφ. Also, the reel mark is rewound around the inner diameter of the coil, the reel mark occurrence part is visually confirmed, the step of that part is measured with a dial depth gauge, and the length of the part where the value is 0.08 mm or more is measured. It was evaluated by doing. The survey results are shown in Table 1.

  From Table 1, according to the winding method of the present invention, when the inner diameter paper tube having a rubber layer on the outer periphery is used and the shape correction of the tip portion of the steel strip is performed, the generation length of the reel mark It can be seen that can be reduced to 15 m or less.

  No. of Example 1 Under the conditions of 6, the outer peripheral direction length (width W) of the taper portion of the cut portion provided in the rubber layer is variously changed within a range of 1 to 25 mm, and the relationship between the length of the taper portion and the generation length of the reel mark Was investigated by the same evaluation method as in Example 1. The results are shown in FIG. 2, and it can be seen that the length of the reel mark generated at the inner diameter portion of the coil can be reduced to 15 m or less by setting the length of the tapered portion to 10 mm or more. On the other hand, when one of the above conditions is not satisfied, the reel mark generation length exceeds 15 m.

C: A continuous cast steel material made of 0.0010 to 0.06 mass% of low carbon steel or extremely low carbon Al killed steel is hot-rolled, cold-rolled, and cold-rolled with a thickness of 1.0 mm and a width of 1220 mm. After the steel sheet was formed, it was continuously annealed at a temperature of 770 to 840 ° C., and then subjected to pure galvanizing with an adhesion amount of 20 g / m ² each on the front and back sides in a continuous electrogalvanizing line to obtain an electrogalvanized steel strip. Then, in order to attach the inner diameter paper tube of the present invention to the inner diameter of the steel strip, it was rewound by a recoiling line and wound up. At this time, the inner diameter paper tube used was a paper tube inner diameter of 508 mmφ, a paper tube thickness of 25 mm, a rubber layer thickness of 3 mm, a vertical wall step difference of 2.5 mm in the cut portion, and a taper portion length of 12 mm. Further, the shape correction of the coil tip was performed with a curvature radius of 254 mm and a correction length of 250 mm. Further, the reel mark generation length was set to a length in which the height of the unevenness was measured with a dial depth gauge as in Examples 1 and 2, and the value was 0.08 mm or more. The measurement results are shown in Table 2.

  From Table 2, when using an inner diameter paper tube having a rubber layer with a cut portion having a predetermined dimension on the outer periphery and correcting the shape of the tip of the steel strip according to the winding method of the present invention It can be seen that the generation length of the roll mark can be reduced to 15 m or less. On the other hand, when one of the above conditions is not satisfied, the reel mark generation length exceeds 15 m.

  In the above embodiment, the electrogalvanized steel strip has been described as an example. However, a cold-rolled steel strip that has not been plated, a non-alloyed or galvannealed steel strip that has been hot-dip galvanized, Of course, the technique of the present invention may be applied to a surface-treated steel strip that has been subjected to coating or chemical conversion treatment.

  The technology of the present invention is not limited to steel strips, and can be suitably applied to various metal strips other than steel and metal strips subjected to various plating and surface treatments.

It is sectional drawing of the internal diameter paper tube of this invention. It is a graph which shows the relationship between the outer peripheral direction length and reel mark generation | occurrence | production length in the notch part of the rubber layer provided in the internal diameter paper tube outer periphery.

Explanation of symbols

1: Paper sleeve (paper tube)
2: Rubber layer 3: Cut portion 31: Vertical wall portion 32: Tapered portion h: Step difference in the vertical wall portion w: Width of the tapered portion (length in the outer peripheral direction of the paper tube)

Claims (5)

A paper-made paper tube inserted into the coil inner diameter of the metal band, having a rubber layer on the outer peripheral surface, and a step of 2.5 times or more the thickness of the metal band at one location on the outer peripheral surface of the rubber layer Winding of a metal strip to form a coil by winding a metal strip around the outer periphery of an inner diameter paper tube having a vertical wall portion and a taper portion having an outer circumferential length of 10 mm or more provided in the axial direction of the paper tube The tip of the metal strip to be wound is bent and deformed to a radius of curvature or less of the outer circumference of the inner diameter paper tube, and then the tip of the metal strip whose shape has been corrected is brought into contact with a notch provided in the rubber layer. Then, winding of the metal strip is started, and the winding method of the metal strip is characterized by the following. Winding method for a metal strip according to claim 1, characterized in that the length of the straightening portion of the metal strip tip from the coil tip and above the outer peripheral direction length of the notch. After the shape-corrected metal band tip is brought into contact with the cut portion of the rubber layer of the inner diameter paper tube, the tip of the metal band is fixed to the rubber layer with an adhesive tape, and then the winding of the metal band is started. The winding method of the metal strip in any one of Claim 1 or 2 . The metal ribbon according to any one of claims 1 to 3, wherein the inner diameter paper tube has a paper portion thickness of 10 to 30 mm and a rubber layer thickness of 2 to 5 mm. Winding method . The metal strip winding method according to any one of claims 1 to 4 , wherein the metal strip is a steel strip having a yield stress of 300 MPa or less and / or a plate thickness of 1.0 mm or more.

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