JP4739037B2 - Tension reel with gripper, metal strip winding method and apparatus - Google Patents

Description

  The present invention relates to a tension reel having a gripper that bites a tip end portion of a metal band, and a method and an apparatus for winding a metal band using the tension reel.

  Metal strips (metals other than steel are also considered in the present invention, but the case of steel will be described as an example, and will be referred to as a steel strip for the sake of convenience). After being manufactured, it is cast into a slab, and then manufactured through hot rolling and cold rolling, or further subjected to pickling, plating, etc. before shipment.

  Many of such hot rolling, cold rolling, pickling and plating processing factories are provided with tension reels for winding a steel strip in a coil shape.

  As a method of winding the tip of the steel strip around the mandrel of these tension reels, a method in which the tip of the steel strip is engaged with a gripper provided on the mandrel and a method called a belt wrapper, the tip of the steel strip is placed on the mandrel. There is a way to press.

  The steel strip wound in the coil shape by the tension reel is sent to the next process or shipped as a product, so if the steel strip wound in the coil shape is wrinkled or deformed However, since the yield is greatly reduced, various methods for preventing wrinkles and deformation caused by the tension reel have been proposed.

  A tension reel having a gripper has a relatively simple structure and can stably wind a steel strip. Therefore, a tension reel having a gripper is often used.

  FIG. 1 shows an example of a structure of a general tension reel that has been conventionally used.

  The tension reel 10 includes a mandrel 12 for winding the steel strip 8, a drive motor 14 and a speed reducer 16 for winding the steel strip 8 in a coil shape while applying tension to the steel strip 8, and a hydraulic cylinder connected to the rear of the mandrel 12. 18. As shown in FIG. 2, the mandrel 12 is structured such that a segment 22 and a gripper 24 are attached to a mandrel shaft 20 via a segment expansion / contraction wedge 26 and a gripper expansion / contraction wedge 28. The segment expanding / contracting wedge 26 and the gripper expanding / contracting wedge 28 are moved by the above-described hydraulic cylinder 18 to expand / contract the segment 22 and the wedge 28 in the mandrel radial direction. FIG. 1 shows both the segment 22 and the gripper 24 in an enlarged state, but it can be seen that the shape of the segment 22 connecting the outer surfaces of the mandrel in the radial direction is almost a perfect circle. By winding the steel strip 8 around the mandrel 12 in this state, the shape of the steel strip coil is formed into a perfect circle.

  FIG. 3 shows an enlarged view around the gripper 24 when the steel strip 8 is wound around the general tension reel 10. The gripper 24 is for holding the steel strip tip between the segment 22 and holding it against the tension generated in the steel strip 8 during winding and the bending force for winding the steel strip 8 around the mandrel 12. However, when wound with a general tension reel, as shown in the drawing, at the overlapping portion of the first and second windings around the gripper 24, the inflection deviates from the perfect circle shape determined from the segment shape described above. It can be seen that point A occurs. In the overlap portion of the first roll and the second roll, the second roll steel strip is only the thickness of the first roll steel strip and the lift due to the steel strip tip 8A coming out of the gripper 24 not being bent suddenly. Deviate from the perfect circle shape.

  FIG. 4 is a schematic diagram of the grip mark 9 when the steel strip 8 is wound with a general tension reel. FIG. 3 shows a state in which the steel strip coil is rewound, and it can be seen that a streak pattern is generated at one winding pitch P of the coil. This occurs at the position of the inflection point A in the periphery of the gripper 24 shown in FIG. 3, and the steel strips are strongly pressed because the curvature is different from the other parts, and appears as a difference in gloss. This streaky pattern is said to be a grip mark. The grip mark becomes thinner toward the outer side in the coil radial direction, but generally 20 to 30 turns, and the length of the steel strip 8 is about 50 m or more, which is a cause of truncation.

  As a method for preventing the occurrence of such grip marks, Patent Document 1 discloses that the tension applied to the steel strip at the initial stage of winding is controlled in accordance with the thickness of the steel strip, and the sinking depth of the steel strip tip into the grip portion is determined. A method for adjusting the thickness to a range of 0.5 to 1.0 times the plate thickness has been proposed.

  Further, in Patent Document 2, the bending stress acting on the steel strip as the mandrel radius is finally increased as the curvature of the outer peripheral surface of the segment adjacent to the grip portion is minimized in the immediate vicinity of the grip portion in the circumferential direction. A method for reducing the above has been proposed.

  Patent Document 3 proposes a winding method in which a pressing roll is disposed in the vicinity of the mandrel in addition to the segment shape of Patent Document 2 and the pressing roll is appropriately used.

JP-A-6-246345 Japanese Utility Model Publication No. 2-118612 JP 11-347627 A

  However, the method proposed by Patent Document 1 is a method that is effective in the case of a belt wrapper type tension reel, and is not applicable to a tension reel having a grip portion, which is a problem in the present invention.

  In the method proposed by Patent Document 2, the radius of curvature of the outer peripheral surface of the segment adjacent to the grip portion is minimized in the immediate vicinity of the grip portion, sequentially increased in the circumferential direction, and finally the mandrel radius is obtained. When the initial tension at the time of removal is large, the steel strip sticks to the outer peripheral surface of the segment, and the curvature of the portion corresponding to the radius of curvature that does not match the mandrel radius is transferred to the steel strip to become a grip mark or the first roll There is a problem that a gap is formed in the overlapped portion of the second roll, thereby causing wrinkles.

  In order to prevent this, even in a method using a pressing roll as in Patent Document 3, the tension applied to the coil, the pressing force of the pressing roll, and the pressing force are applied so that the curvature not matching the mandrel radius is not transferred to the steel strip. It was necessary to precisely control the number of turns of the discarded winding that relaxed the timing and tension.

  The present invention has been made to solve the above-described problems of the prior art. In a tension reel having a gripper, a grip mark is generated without requiring additional control such as a press roll and complicated control. It is an object to prevent this.

  In the tension reel having a gripper, the angle of the surface in contact with the metal band of the gripper with respect to the circumferential direction of the mandrel is 30 ° or less, and the segment adjacent to the gripper in the winding direction of the metal band is in contact with the metal band. An auxiliary segment whose surface curvature matches the segment curvature is provided to be swingable, and the position of the surface in contact with the metal band of the auxiliary segment at the time of winding the metal band in the mandrel radial direction is the end on the gripper side in the mandrel circumferential direction In the above, the above problem is solved by lowering the segment from the segment by the same amount as the thickness of the metal band and eliminating the step from the segment at the end opposite to the gripper.

  Further, the length of the auxiliary segment in the circumferential direction of the mandrel is set to 100 mm or more.

  Further, the auxiliary segment is supported so as to be swingable by using a fulcrum liner and a biasing means.

  Further, the auxiliary segment is in contact with the gripper, and the gripper can swing in the mandrel radial direction with the fulcrum liner as a fulcrum.

  The present invention also provides a method of winding a metal band, wherein the metal band is wound using the tension reel.

  The present invention also provides a metal strip winding device comprising the tension reel.

  According to the present invention, in a tension reel having a gripper, grip equipment can be stably prevented by inexpensive equipment and simple control without the need for new equipment or complicated control, and the yield can be greatly improved. Can be planned.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 5 shows an enlarged view around the gripper of the tension reel of this embodiment. The angle θ of the gripper 24 with respect to the circumferential direction of the mandrel is set to 30 °, and the segment 22B adjacent to the gripper 24 in the winding direction of the metal strip (the steel strip 8 in the drawings after FIG. 6) is The auxiliary segment 30 whose curvature coincides with the segment curvature is provided so as to be swingable via a fulcrum liner 32 having a semicircular head in section and a biasing means such as a coil spring mechanism 34.

  The fulcrum liner 32 is fixed to the auxiliary segment 30 by a bolt 33.

  The coil spring mechanism 34 includes a coil 36 and a bolt 38 having an adjustable length for adjusting the biasing force of the coil.

  Here, in the present invention, the angle θ is set to 30 ° or less because if it exceeds 30 °, the inflection point is generated and the grip mark is easily generated.

  The auxiliary segment 30 is in contact with the gripper 24 via the shoe 31 and can swing in the mandrel radial direction with the gripper 24 as a fulcrum liner 32 as a fulcrum. The length L of the auxiliary segment 30 in the circumferential direction of the mandrel is 120 mm. This figure is a state diagram in the segment expansion and the gripper expansion, but it can be seen that the line connecting the segment and auxiliary segment outside in the mandrel radial direction is a perfect circle.

  FIG. 6 is an enlarged view of the periphery of the gripper when the steel strip 8 is wound with the tension reel of this embodiment. 5, since the position of the gripper 24 at the time of expansion is lowered in the mandrel radial direction by the thickness of the steel strip 8, the surface of the auxiliary segment 30 lifted by the gripper 24 in the mandrel radial direction is in contact with the steel strip 8. At the end portion (D portion in the drawing) on the gripper 24 side in the circumferential direction of the mandrel, the same amount as the thickness of the steel strip 8 and a segment adjacent to the gripper 24 in the winding direction of the steel strip 8 (also referred to as a gripper adjacent segment). ) You can see that it is down from 22A. In addition, in the connection portion (E portion in the drawing) adjacent to the segment (also referred to as an auxiliary segment adjacent segment) 22B adjacent to the winding direction of the steel strip of the auxiliary segment 30, the fulcrum liner 32 is closest to the segment 22B. It can be seen that there is no level difference.

  Thus, in the connection part (D part) of the 2nd roll and the 1st roll, the auxiliary segment 30 has just decreased by the thickness of the steel strip 8 in the mandrel radial direction, and contacts the steel strip 8 of the gripper 24. Since the angle θ of the surface with respect to the circumferential direction of the mandrel is as small as 30 ° or less, the second steel strip is the same as the first steel strip as in the example of the general tension reel shown in FIG. Thickness and the amount of lifting due to the steel strip coming out of the gripper not being bent suddenly, it will not be lifted off the perfect circle shape, and it will be smoothly wound without inflection points. I understand.

  However, although the curvature of the surface in contact with the steel strip 8 of the auxiliary segment 30 is matched to the segment curvature, the end on the gripper 24 side is in the mandrel radial direction by the thickness of the steel strip 8 with the fulcrum liner 32 as a fulcrum. Since the auxiliary segment 30 swings and rotates so as to be lowered and is stationary, the shape of the auxiliary segment 30 on the outer side in the mandrel radial direction deviates from the perfect circle formed from the segment as compared with the state of FIG. I'm stuck. In this connection, a slight inflection point is inevitably generated at the connection portion (E portion) between the auxiliary segment 30 and the segment 22B adjacent to the steel strip in the winding direction. The rotation angle of the auxiliary segment 30 is substantially expressed by the thickness of the steel strip 8 / the length of the auxiliary segment 30 in the mandrel circumferential direction. In the present embodiment, the length L of the auxiliary segment 30 in the circumferential direction of the mandrel is 100 mm. By making it long as described above, the connecting portion (E portion) with the segment 22B adjacent to the winding direction of the steel strip of the auxiliary segment 30 with respect to the thickness (0.1 to 9 mm) of a general steel strip. The steel strip 8 can be wound without having a large inflection point that causes a grip mark.

  FIG. 7 shows the results of an experiment conducted on the influence of the angle θ of the surface of the gripper 24 in contact with the steel strip 8 with respect to the circumferential direction of the mandrel on the cut-off length of the steel strip 8 due to the grip mark. It can be seen that the cut-off length of the steel strip 8 decreases as the angle θ of the surface of the gripper 24 in contact with the steel strip 8 with respect to the circumferential direction of the mandrel decreases, and the cut-off length can be reduced to 0 ° or less.

  FIG. 8 shows a winding state diagram of the steel strip 8 when the angle θ of the surface of the gripper 24 in contact with the steel strip 8 in the experiment of FIG. Since the angle θ of the gripper 24 is large, the front end portion 8A of the steel strip 8 coming out of the gripper 24 cannot be bent suddenly and rises greatly in the radial direction of the mandrel, resulting in a large inflection in the overlapping portion with the second and subsequent turns. It can be seen that point A has occurred.

  FIG. 9 shows the result of an experiment conducted on the influence of the length L of the auxiliary segment 30 in the circumferential direction on the cut-off length of the steel strip 8 by the grip mark. It can be seen that the cut-off length is shorter as the length L of the auxiliary segment 30 is longer, and the cut-off length can be reduced to 0 by setting the length to 100 mm or more.

  FIG. 10 shows a winding state diagram of the steel strip when the circumferential length L of the auxiliary segment 30 is 50 mm. However, since the length L of the auxiliary segment 30 is short, An inflection point A that can be clearly seen by visual inspection is generated at the connecting portion with the adjacent segment 22B because the rotation angle becomes large.

  FIG. 11 shows that the radius of curvature of the outer peripheral surface of the auxiliary segment 30 is minimized in the immediate vicinity of the gripper 24 and gradually increased in the circumferential direction using the methods proposed in Patent Document 2 and Patent Document 1, and finally the mandrel A winding state diagram in the case of a radius is shown. When the initial tension at the time of winding is large, the steel strip 8 sticks to the outer peripheral surface of the segment, and the curvature corresponding to the curvature radius that does not match the mandrel radius is transferred to the steel strip 8, and the boundary between the adjacent segments Is a grip mark, or a gap is formed in the overlap portion between the first and second rolls, and an inflection point A is generated. In order to prevent this, it is necessary to control the tension applied to the coil, the pressing force and pressing timing of the pressing roll, the number of windings for discarding winding to loosen the tension with high precision. Does not generate an inflection point that generates a grip mark even when the initial tension is large, and does not require additional control such as a press roll or complicated control.

  In the above embodiment, the case where the present invention is applied to a steel strip has been described. However, the present invention is not limited to this and can be applied to a metal strip in general.

Perspective view showing the structure of a general tension reel 1 is a sectional view taken along the line II-II in FIG. Enlarged view around the gripper when a steel strip is wound with a general tension reel Schematic diagram of grip marks when steel strip is wound with a general tension reel The enlarged view around the gripper in one embodiment of the present invention Enlarged view of the gripper area when a steel strip is wound Diagram showing the effect of angle θ relative to the mandrel circumferential direction of the surface of the gripper contacting the steel strip on the cut-off length of the steel strip Winding state diagram of the steel strip when the angle θ with respect to the circumferential direction of the mandrel of the surface in contact with the steel strip of the gripper is 60 ° Diagram showing the influence of the mandrel circumferential length L of the auxiliary segment on the cut-off length of the steel strip Steel band winding state diagram when the auxiliary segment mandrel circumferential length L is 50 mm Steel strip winding state diagram when the curvature of the outer peripheral surface of the auxiliary segment is changed sequentially as in the prior art

Explanation of symbols

8 ... Steel strip 8A ... Steel strip tip 9 ... Grip mark 10 ... Tension reel 12 ... Mandrel 14 ... Drive motor 16 ... Reduction gear 18 ... Hydraulic cylinder 20 ... Mandrel shaft 22, 22A, 22B ... Segment 24 ... Gripper 26 ... Segment expansion / contraction Wedge 28 ... Gripper expanding / contracting wedge 30 ... Auxiliary segment 32 ... Supporting liner 34 ... Coil spring mechanism A ... Inflection point P ... Coil 1 turn pitch L ... Auxiliary segment circumferential length θ ... Contact with gripper steel strip Angle of surface relative to circumferential direction of mandrel

Claims (6)

  An auxiliary segment in which the angle of the surface of the gripper in contact with the metal band is 30 ° or less and the curvature of the surface in contact with the metal band coincides with the segment curvature in the segment adjacent to the gripper in the winding direction of the metal band The position of the surface in contact with the metal band of the auxiliary segment at the time of winding the metal band is the same amount as the thickness of the metal band at the gripper side end in the mandrel circumferential direction, A tension reel having a gripper for gripping a tip end portion of a metal band, wherein the tip end portion of the metal band is made to be lowered from the segment and at the end opposite to the gripper, no step is formed with the segment.   The tension reel having a gripper according to claim 1, wherein a length of the auxiliary segment in the circumferential direction of the mandrel is 100 mm or more.   The tension reel having a gripper according to claim 1 or 2, wherein the auxiliary segment is swingably supported by using a fulcrum liner and a biasing means.   The tension reel having a gripper according to claim 3, wherein the auxiliary segment is in contact with the gripper, and can be swung in the radial direction of the mandrel by the gripper with the fulcrum liner as a fulcrum.   A metal strip winding method, wherein the metal strip is wound using the tension reel according to any one of claims 1 to 4.   A metal strip winding device comprising the tension reel according to any one of claims 1 to 4.

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