JPH09206828A - Method for unwinding coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the transfer of a mark generating when unwinding a coil with a simple structure. SOLUTION: A thin wall iron sleeve 1 installed with a slit 2 extending to the axial direction is prepared. Then, in the state of reducing a mandrel 4 of an unwinding device to the smallest diameter, the iron sleeve 1 is inserted in the mandrel 4. Next, after inserting a coil 3 into the mandrel 4, the mandrel 4 is enlarged in diameter, the circumference face of a segment 4a constituting the external circumference part of the mandrel 4 is pressed to the internal circumference face of the coil 3 through the iron sleeve 1. In this case, the iron sleeve 1 is enlarged following to enlarging of the end faces of butting parts 2a of the slit 2 by being pressed from the mandrel 4. Therefore, the shape of the circumference direction end part of each segment 4 is prevented from being transferred.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewinding method for rewinding a coil made of a strip-shaped steel plate or the like, and is effective for rewinding a cold rolled thin steel plate, particularly a coil made of an annealed thin steel plate. The present invention relates to a simple coil rewinding method.

[0002]

2. Description of the Related Art Cold-rolled steel sheets are manufactured by sequentially subjecting a hot-rolled coil to a pickling step, a cold rolling step, an annealing step, a refining step, a plating step and the like. Then, in each of the above steps, as shown in FIG.
The coil 51 is sequentially rewound, and the desired treatment 52 such as pickling is performed.
After that, the coil 51 is sequentially wound on the tension reel 53 to form the coil 51 again, and the coil 51 is conveyed to the next step.

As shown in FIG. 11, the rewinding device 50 includes a mandrel 54 which is inserted in the center of the coil 51. As shown in FIG. 12, the outer peripheral portion of the mandrel 54 is composed of four segments 55 arranged in the circumferential direction, and the contour shape of the mandrel 54 is set to a circular shape that can be engaged with the inner peripheral surface of the coil 51. Has been done. And
Each segment 55 is driven by hydraulic pressure,
The mandrel 54 is configured to be capable of radially advancing and retreating in a radial direction in synchronization with one another, and the contour shape of the mandrel 54 is expanded and contracted.

In the conventional case, the contour shape of each segment 55 of the mandrel 54 is the same as that of the coil 51.
It is set to a circular arc shape having the same curvature as the inner peripheral surface and no change in curvature in the circumferential direction. That is, the contour shape of the mandrel 54 becomes a perfect circle in a state where each segment 55 is projected outward and brought into contact with the inner surface of the coil 51. Further, as shown in FIG. 11, the circumferential end of each segment 55 is provided with a meshing portion 55a capable of mutually meshing with the end of the adjacent segment 55.
By engaging the meshing parts 55a of the
It is possible to make the diameter of 4 smaller than the inner diameter of the coil 51.

In the rewinding device 50 having the above structure,
In the state where the meshing portions 55a of the segments 55 are meshed with each other and the diameter of the mandrel 54 is made smaller than the inner diameter of the coil 51 as described above, the coil 51 is inserted into the mandrel 54 and attached. Then, each segment 5 by hydraulic pressure
5 is moved radially outward to expand the diameter of the mandrel 54 and press the outer peripheral surface of each segment 55 against the inner peripheral surface of the coil 51 with high pressure.

As a result, the coil 51 becomes the mandrel 5
4, the coil 51 is unwound while controlling the rotation of the mandrel 54. However,
In the rewinding device 50 including the mandrel 54 as described above, the entire outer peripheral surface of the segment 55 is placed on the inner peripheral surface of the coil 51 so that slippage does not occur between the segment 55 and the inner peripheral surface of the coil 51 during operation. It is necessary to press it with a strong contact pressure. As a result, at the corner of the meshing portion 55a of each segment 55, there is a sharp change in the contact pressure due to a sharp change in the curvature, and as shown in FIG. 8, the outer end shape of the meshing portion 55a is the segment mark 57. As a result, it is transferred to the inner diameter side portion of the coil 51.

Particularly, when the remaining amount of the coil 51 becomes small,
Since the force that suppresses the expansion of the diameter of the mandrel 54 on the coil 51 side becomes weak, each segment 55 pushes and spreads outward in the radial direction to a position where the pressing force of each segment 55 and the pressing force of the coil 51 are balanced, and The pressing of 55a against the inner peripheral surface of the coil 51 becomes stronger, and the segment mark 5
7 is increased.

This segment mark 57 is particularly likely to occur on a soft steel plate (such as low carbon steel or extremely low carbon steel) after annealing, and the segment mark 57 is located at a position 30 to 50 m from the inner end of the coil 51 (coil 51). The number of windings on the inner diameter side may be, for example, 20. Since the portion to which the segment mark 57 is transferred does not become a product, it is cut off in each step, which is a factor of deteriorating the yield.

In order to prevent the transfer of the segment mark 57, the following method has been conventionally considered. By reducing the expansion pressure of each segment 55, the contact pressure on the inner peripheral surface of the coil 51 is suppressed to a low level. A thick rubber sleeve is attached to the outer periphery of the mandrel 54 to suppress a sudden change in the contact pressure of the end portion of the segment 55 to the inner peripheral surface of the coil 51.

[0010]

However, although the transfer of the segment mark 57 can be slightly reduced by the method of reducing the expansion pressure of each segment 55 as described above, the expansion pressure can be reduced. During operation, slippage may occur between the coil 51 and the mandrel 54.

At this time, it is possible to control the expanding pressure according to the number of remaining turns of the coil 51, but the rewinding device 50 is complicated. Then, as above, mandrel 5
Although a method of mounting a thick rubber sleeve on the outer circumference of 4 is effective in preventing the transfer of the segment mark 57, the rubber sleeve is a consumable item and the rubber sleeve is expensive, so that the running It is one of the factors that increase the cost.

Further, since the rubber sleeve is generally required to have a thickness of 20 mm or more, in order to mount the rubber sleeve on the existing mandrel 54 for use, the outer surface of the mandrel 54 is shaved to have an outer diameter. Needs to be set to a small diameter. This reduces the strength of the mandrel 54,
The weight of the coil 51 that can be inserted into the mandrel 54 must be set lower than in the conventional case. Conversely, when inserting a thin rubber sleeve of about 3 to 10 mm without cutting the mandrel 54 into a small diameter, the rubber sleeve does not have sufficient strength to stand on its own, and the rubber sleeve is attached to or detached from the mandrel 54. Becomes difficult, and the effect of preventing the transfer of the segment mark 57 becomes low.

The present invention has been made in view of the above problems, and an object thereof is to reduce the transfer of the segment mark generated at the time of rewinding the coil with a simple structure.

[0014]

In order to solve the above problems, the coil rewinding method of the present invention is a coil rewinding method in which a mandrel of a rewinding device is inserted into the center of a coil and the coil is rewound from the outer peripheral side. In the returning method, between the outer peripheral surface of the mandrel and the inner peripheral surface of the coil, a cylindrical member provided with a slit extending in the axial direction is inserted coaxially or substantially coaxially with the mandrel. .

In the present invention, since the outer circumference of the mandrel is covered with the cylindrical member, the outer circumference of the mandrel is pressed against the inner circumference of the coil through the cylindrical member, and the outer circumference of the mandrel is the inner circumference of the coil. It becomes a non-contact state. As a result, it is possible to prevent the shape of the outer circumference of the mandrel, which has been conventionally generated, from being transferred to the inner diameter side of the coil. Further, when the diameter of the mandrel is enlarged or reduced in order to insert the mandrel of the rewinding device into the center of the coil or to press the outer peripheral surface of the rewinding device against the inner peripheral surface of the coil, the cylindrical member causes protrusion of the slit. The diameter changes as the gap between the mating portions changes, and it is possible to follow the expansion and contraction of the mandrel.

Therefore, the cylindrical member does not need to be formed of a member such as rubber that expands and contracts in the radial direction. Next, the invention described in claim 2 is characterized in that, in contrast to the configuration described in claim 1, the cylindrical member is manufactured from a steel material. This invention changes the idea from the conventional segment mark prevention method and covers the outer circumference of the mandrel with a cylindrical member made of a steel material having a predetermined hardness, so that the shape of the outer circumference of the mandrel is transferred to the inner diameter side of the coil. It is to prevent that.

Since the cylindrical member is made of a hard steel material as described above, transfer of the shape of the outer periphery of the mandrel to the inner diameter side of the coil can be achieved even if the wall thickness is greatly reduced as compared with the rubber sleeve. It is prevented, and the durability is greatly increased. Further, since the cylindrical member made of the above steel material has a predetermined strength, it is possible to maintain a cylindrical shape having a predetermined diameter by itself even if the wall thickness is made thin, and a predetermined elastic force is applied. Since it has it, it can follow the expansion and contraction of the mandrel surely and expand and contract.

Next, the invention described in claim 3 is different from the structure described in claim 1 or 2 in that the thickness of the cylindrical member in the vicinity of the slit is the abutting portion of the slit. It is characterized in that it is continuously thin in the circumferential direction. When the inner peripheral surface in the vicinity of the slit of the cylindrical member abuts the mandrel outer peripheral surface by continuously thinning the wall thickness in the vicinity of the slit toward the abutting portion of the slit, the outer peripheral surface thereof. Has a tapered surface shape that approaches the outer peripheral surface of the mandrel toward the abutting portion of the slit. As a result, when the outer circumference of the mandrel is pressed against the inner circumferential surface of the coil via the cylindrical member, the change in the circumferential contact pressure on the inner circumferential surface of the coil near the slit is reduced.

Next, the invention described in claim 4 is the same as the structure described in any one of claims 1 to 3.
The cylindrical member is characterized in that, in an unloaded state, the abutting portions of the slits overlap each other in the radial direction, and the outer diameter is smaller than the inner diameter of the coil. When the abutting portions of the slits are overlapped with each other in the radial direction in the unloaded state, when the diameter is expanded and the outer peripheral surface comes into contact with the inner peripheral surface of the coil, the distance between the abutting surfaces in the slit is increased. It can be set to zero or small.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the cylindrical member used in the present embodiment is a thin cylindrical iron sleeve 1 having a slit 2 extending in the axial direction at one circumferential position thereof. There is. The diameter of the iron sleeve 1 can be expanded by opening the space between the end faces of the abutting portion 2a of the slit 2.

The outer diameter of the iron sleeve 1 is set smaller than the inner diameter of the target coil 3, and the inner diameter thereof is set larger than the diameter of the mandrel 4 at the maximum contraction diameter. next,
Rewinding of the coil 3 using the iron sleeve 1 will be described. First, the iron sleeve 1 is inserted into the mandrel 4 in a state where the mandrel 4 of the rewinding device is contracted to the maximum contracted diameter. At this time, since the inner diameter of the iron sleeve 1 is larger, the iron sleeve 1 can be easily inserted.

Next, the mandrel 4 is slightly expanded in diameter,
As shown in FIG. 2, the outer peripheral surface of the mandrel 4 is brought into contact with the inner peripheral surface of the iron sleeve 1. As a result, the mandrel 4
The iron sleeve 1 is integrated with the iron sleeve 1, and prevents the iron sleeve 1 from being displaced in the axial direction when the coil 3 is attached to the mandrel 4. Next, after inserting the coil 3 into the mandrel 4, the diameter of the mandrel 4 is expanded, and the outer peripheral surface of the segment 4a forming the outer peripheral portion of the mandrel 4 is inserted through the iron sleeve 1 as shown in FIGS. 3 and 4. The inner peripheral surface 3a of the coil 3 is pressed. At this time, the iron sleeve 1
Due to the pressure from the mandrel 4, the end face of the abutting portion 2a of the slit 2 is opened, so that the diameter of the mandrel 4 is increased in accordance with the increased diameter.

Although the slit 2 of the iron sleeve 1 is shown in FIG. 4 as being set at the central position in the circumferential direction of the segment 4a, the position of the slit 2 above the meshing position of the segment 4a. May be set. Next, while controlling the rotation of the mandrel 4, the coil 3 is rewound from the outer peripheral side and a desired process is performed.

When the diameter of the mandrel 4 is reduced when the rewinding of the coil 3 is completed, the elasticity of the iron sleeve 1 itself causes the iron sleeve 1 to follow the diameter reduction of the mandrel 4 and shrink to the original diameter. Diameter. As described above, by covering the outer peripheries of the four segments 4a forming the outer peripheral part of the mandrel 4 with the hard iron sleeve 1, each segment 4a can be pressed against the inner peripheral surface 3a of the coil 3 via the iron sleeve 1. Therefore, it is possible to prevent the shape of the circumferential end portion of each segment 4a, which has conventionally caused a rapid change in contact pressure, from being transferred to the inner diameter side of the coil 3.

At this time, the corners of the abutting portions 2a forming the slits 2 of the iron sleeve 1 are transferred to the inner diameter side of the coil 3. Conventionally, four segment marks are transferred in units of a predetermined coil length. Only one transfer mark is needed. Moreover, the conventional segment mark is shown in FIG.
However, since the slit 2 of the iron sleeve 1 is linear, the mark transferred from the iron sleeve 1 is a straight line extending in the width direction.

Since the iron sleeve 1 has a thin wall, it can be used on the existing mandrel 4 without cutting the outer peripheral surface. Further, since the iron sleeve 1 is made of a steel material, it has significantly improved durability and is inexpensive as compared with the rubber sleeve. Furthermore, it is easier to attach and detach than the rubber sleeve.

Here, it is considered appropriate that the thickness of the iron sleeve 1 is, for example, about 3 to 6 mm. This is because if the wall thickness is too thin, the life of the iron sleeve 1 is shortened, and if the wall thickness is too hot, it becomes difficult to insert the iron sleeve 1 into the mandrel 4. When the coil 3 is inserted into the mandrel 4 with the iron sleeve 1 attached to the outer periphery of the mandrel 4, as shown in FIG.
If the tail end 3b of the coil 3 is set to be located in the space between the abutting portions 2a, it is possible to prevent an end mark generated when the tail end 3b is pressed against the inner peripheral surface 3a of the coil 3. Become.

When the iron sleeve 1 is not removed from the mandrel 4, a part of the iron sleeve 1 is sewn or welded to the outer periphery of the mandrel 4 to prevent the position of the iron sleeve 1 from changing in the axial direction. It may be suppressed. Although the cylindrical member is made of the iron sleeve 1 in the above embodiment, the present invention is not limited to this. For example,
The cylindrical member may be made of a material such as copper or hard resin. In short, it is sufficient if it is made of a material having elasticity capable of expanding and contracting the diameter and having a certain degree of hardness.

Further, the slit 2 provided in the iron sleeve 1
Does not necessarily extend linearly in the axial direction, but may be formed to extend in the axial direction while meandering. Also,
In the above-mentioned embodiment, the iron sleeve 1 which is a cylindrical member
, The coil sleeve 3 is attached to the mandrel 4 first, and then the coil 3 is attached to the mandrel 4, so that the iron sleeve 1 is inserted between the mandrel 4 and the coil 3. , But is not limited to this. For example, first, the iron sleeve 1 having an outer diameter of approximately the same diameter is fitted into the inner peripheral surface 3a of the coil 3 and then the coil 3
The iron sleeve 1 may be inserted between the mandrel 4 and the coil 3 by inserting the iron sleeve 1 into the mandrel 4.

For example, when the steel plate is wound on the tension reel to form the coil 3, the iron sleeve 1 as described above is fitted in advance on the outer circumference of the mandrel of the tension reel, and the steel plate is wound on the outer circumference of the iron sleeve 1. By taking
The iron sleeve 1 is attached to the inner peripheral surface 3 a of the coil 3. Next, a second embodiment will be described based on the drawings. The same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The iron sleeve 1 which is a cylindrical member used in the second embodiment has the same basic shape as the iron sleeve 1 of the first embodiment, and as shown in FIG. Only the shape of the abutting portion 2a near the slit 2 is different. The shape of the vicinity of the slit 2 is such that the outer peripheral surface thereof is cut into a knife edge shape such that the end face side of the abutting portion 2a is sharpened, and the outer peripheral surface is processed smoothly. As a result, the wall thickness in the vicinity of the slit 2 is
It becomes thinner continuously in the circumferential direction toward the end face of the butt portion. Here, in FIG. 6, reference numeral 5 indicates a portion that has been scraped off.

With this arrangement, when the outer periphery of the mandrel 4 is pressed against the inner peripheral surface 3a of the coil 3 via the iron sleeve 1, the position of the coil 3 between the abutting portions 2a of the slit 2 is shown in FIG. By changing from the A position to the B position, the change in the circumferential contact pressure is set small. This makes it possible to reduce the marks transferred from the slit 2 portion of the iron sleeve 1 to the inner diameter side of the coil 3.

In the above embodiment, the case where the outer peripheral surface of the iron sleeve 1 in the vicinity of the slit 2 is shaved has been described, but the inner peripheral surface side may be shaved or the inner peripheral surface and the outer peripheral surface may be cut. Both sides may be ground together. The point is that the wall thickness in the vicinity of the slit 2 may be continuously reduced in the circumferential direction toward the end face of the abutting portion of the slit 2. Next, a third embodiment will be described with reference to the drawings. The same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The iron sleeve 1 which is a cylindrical member used in the third embodiment has the same basic shape as the iron sleeve 1 of the first embodiment. However, as shown in FIG. 8, the shape of the abutting portion 2a near the slit 2 is different. That is, when there is no load, as shown in FIG. 8A, the abutting portions 2a are configured to overlap each other in the radial direction. Then, the diameter under no load is set to be larger than the diameter when the mandrel 4 is most reduced and smaller than the inner diameter of the target coil 3.

Further, when the diameter of the iron sleeve 1 is expanded and the outer peripheral surface abuts the inner peripheral surface 3a of the coil 3, the iron sleeve 1 shown in FIG.
As shown in (b), the gap between the end faces of the abutting portion 2a of the slit 2 is set to zero or a slight gap. By doing so, when the mandrel 4 is pressed against the inner peripheral surface 3a of the coil 3 via the iron sleeve 1, the abutting portions 2a of the slits 2 become substantially continuous, and the abutting portion 2a ends. It is possible to reduce the transfer of the end of the abutting portion 2a to the inner diameter side of the coil 3 by approaching the tangential direction on the inner diameter side of the coil 3 facing in the radial direction.

Here, in FIG. 8, when the one (lower) abutting portion 2a is processed into a knife edge shape and the abutting portions 2a are surely moved in the radial direction when the diameter expanding state is changed to the diameter reducing state. So that they overlap. Further, by cutting the abutting portion 2a near the slit 2 as in the second embodiment, the transfer of the shape of the abutting portion 2a of the iron sleeve 1 to the inner diameter side of the coil 3 is further reduced. Good.

At this time, one of the abutting portions 2a near the slit 2 (outer side) is shaved on the outer peripheral surface side, and the other (inner side) is shaved on the inner peripheral surface side. Even when the iron sleeve 1 is pressed against the inner peripheral surface 3a, as shown in FIG. 9, the abutting portions 2a overlap each other.
The length in the circumferential direction may be set. In this case, the overlapping of the cut portions prevents the formation of the gap between the slits 2 and the outer peripheral shape of the overlapped portion approaches an arc shape.

[0038]

[Example] The outer diameter is 495 mm and the axial length is 125.
The coil 3 was unwound by using the iron sleeve 1 made of S45C steel material having a thickness of 0 mm and a thickness of 4.5 mm. Here, the mandrel 4 has a diameter of 470 mm when the diameter is most reduced, and a diameter of 520 mm when the diameter is maximum. The inner diameter of the coil 3 is 508 mm, and the coil 3 used is a steel plate made of extremely low carbon steel with a thickness of 0.7 mm.

In the vicinity of the slit 2 of the iron sleeve 1,
As in the second embodiment, it is slightly shaved and finished smoothly. When the iron sleeve 1 was inserted between the mandrel 4 and the coil 3 to rewind the coil 3, the mark of the slit 2 of the iron sleeve 1 was about 10 from the tail end 3b side of the coil 3. It was confirmed that the image was transferred up to about 15 m.

For comparison, when the conventional rewinding method without using the iron sleeve 1 and rewinding under the same conditions are performed, the segment 4a mark is about 30 from the tail end 3b side.
It was transferred to a position of up to 50 m. As described above, it can be seen that the mark to be transferred is halved as compared with the conventional case by the simple method of covering the mandrel 4 with the iron sleeve 1.

[0041]

As described above, according to the coil rewinding method of the present invention, the inner circumference of the coil can be simply changed by inserting the cylindrical member with the slit between the mandrel and the inner circumference of the coil. It is possible to reduce the marks transferred to the surface side. There is an effect that the yield of the coil is improved.

At this time, if the invention described in claim 2 is adopted, since the cylindrical member is composed of a hard member,
The thickness of the cylindrical member can be reduced, and even if it is applied to existing equipment, there is an effect that it is not necessary to scrape the outer periphery of a mandrel such as a rubber sleeve, and it can be easily attached and detached.

[Brief description of drawings]

1A and 1B are views showing an iron sleeve according to an embodiment of the present invention, in which FIG. 1A is a view seen from an axial direction, and FIG. 1B is a view seen from a radial direction.

FIG. 2 is a diagram showing a state in which a mandrel is in contact with the iron sleeve according to the embodiment of the present invention.

FIG. 3 is a diagram showing a state at the time of inserting a coil according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state when the coil is attached according to the embodiment of the present invention.

FIG. 5 is a diagram showing a state in which the tail end of the coil according to the embodiment of the present invention is located between the slits.

FIG. 6 is a diagram showing an iron sleeve according to a second embodiment of the present invention.

FIG. 7 is a partially enlarged view of the iron sleeve according to the second embodiment of the present invention.

8A and 8B are views showing an iron sleeve according to a third embodiment of the present invention, in which FIG. 8A shows an unloaded state, and FIG. 8B shows a state when abutting on an inner circumferential surface of a coil. It is a figure.

FIG. 9 is a diagram showing an iron sleeve according to a third embodiment of the present invention.

FIG. 10 is a diagram showing a state in which the rewinding device is used.

FIG. 11 is a diagram showing a rewinding device.

FIG. 12 is a sectional view of a mandrel.

FIG. 13 is a diagram showing a transfer state of a conventional segment mark.

[Explanation of symbols]

 1 Iron Sleeve 2 Slit 2a Butt 3 Coil 3a Inner Surface 4 Mandrel

Claims (4)

[Claims] 1. A coil rewinding method in which a mandrel of a rewinding device is inserted in the center of a coil to rewind the coil from the outer peripheral side, wherein an axial direction is provided between an outer peripheral surface of the mandrel and an inner peripheral surface of the coil. A method of rewinding a coil, characterized in that a cylindrical member provided with a slit extending in the direction is inserted coaxially or substantially coaxially with the mandrel. 2. The coil rewinding method according to claim 1, wherein the cylindrical member is made of a steel material. 3. The wall thickness in the vicinity of the slit of the cylindrical member is continuously thinned in the circumferential direction toward the abutting portion of the slit. Coil rewinding method. 4. The cylindrical member is characterized in that, in an unloaded state, the abutting portions of the slits overlap each other in the radial direction, and the outer diameter is smaller than the coil inner diameter. The coil rewinding method according to claim 3.