JP7480766B2 - Steel strip tail winding device and method, and steel strip continuous processing equipment - Google Patents

Description

The present invention relates to a winding device and method for the tail end of a steel strip, which can prevent the occurrence of shearing of the tail end of a coil without causing scratches or scuffs on the strip edge when winding the tail end of a steel strip into a coil in a steel plate manufacturing line that continuously processes steel strips, and to a continuous steel strip processing facility.

In general, in a steel plate manufacturing line where steel strip is continuously processed, the coiled steel strip is paid out by a pay-off reel, and after processing is completed, it is wound up again into a coil by a tension reel. In order to perform continuous threading, shears are provided at the entry and exit sides of the steel plate manufacturing equipment (the entry side shear is also called the entry side shear, and the exit side shear is also called the exit side shear). The tail end of the leading steel strip (leading material) and the front end of the trailing steel strip (trailing material) are cut and removed by the entry side shear, and then the tail end of the leading material and the front end of the trailing material are welded together. The steel strip that has completed processing is then cut and separated into the leading material and the trailing material by the exit side shear of the steel plate manufacturing equipment, and wound up into coils separately. Cutting by a shear is also called shear cut.

As shown in FIG. 5, in a conventional winding device, a deflector roll 1 for changing the direction of travel of the steel strip S and a pressure roll 2 for pressing the steel strip S on the deflector roll 1 are generally installed between a shear (exit shear) 10 provided at the exit side of the steel sheet manufacturing equipment (not shown) and a tension reel 15.

The steel strip S is under tension by the bridle rolls during continuous threading. If a constant tension is applied to the steel strip S being wound, it is basically wound into a coil without slippage. However, just before it is cut by the shear 10, the tension is reduced to prevent a sudden change in tension, and after it is cut, almost no tension is applied to the tail end of the steel strip S, which is only clamped between the pressure roll 2 and the deflector roll 1 from the shear 10 to the tension reel 15. For this reason, the tail end of the coil may slip due to flapping of the steel strip S or the influence of the coil shape. Slippage at the tail end of the coil is a defect that must be prevented, as it can cause the edge (end in the sheet width direction) to break during coil transportation, etc.

Therefore, conventional methods have been to use magnets, restraining devices and EPC (edge position control) to prevent miswinding at the tail end of the coil.

For example, a technology has been disclosed in which a device (not shown) that restricts the widthwise movement of the steel strip S is installed between the tension reel 15 and the exit shear 10 to prevent the tail end of the coil from shifting (Patent Document 1), and a technology has also been disclosed in which multiple magnetic conveyors (not shown) are placed between the tension reel 15 and the exit shear 10 to constantly apply back tension (rearward tension) to the steel strip S by magnetic force even after shear cutting, thereby preventing the flapping and meandering of the steel strip S while preventing the tail end of the coil from shifting (Patent Document 2).

JP 2007-175713 A JP 2005-254309 A

However, the meandering prevention technology disclosed in Patent Document 1 has the problem that there is a high possibility that the device for preventing winding slippage will come into contact with the plate edge (the widthwise end of the steel strip), which can cause scratches on the plate edge and lead to rough edges on the coil, or require more frequent replacement of the device for preventing winding slippage.

In addition, the technology disclosed in Patent Document 2 uses a magnetic conveyor, which allows a certain amount of back tension to be applied to the steel strip even after shear cutting, but there is a problem in that slippage can occur between the steel strip and the magnetic conveyor, causing scratches on the steel strip.

The present invention aims to solve the problems in the above-mentioned conventional technology and provide a winding device and method for the tail end of a steel strip, as well as continuous steel strip processing equipment, that can prevent the occurrence of winding misalignment at the tail end of a coil without causing scratches or scuffs on the strip edge.

The inventors conducted extensive research to solve the above problems, and as a result discovered that by dividing the pressure roll into two rolls, each of which has a specific range of inward inclination angle relative to the deflector roll, it is possible to prevent winding misalignment at the tail end of the coil without causing scratches or scuffs on the plate edge, and thus developed the present invention.

That is, the present invention is as follows.
[1] A winding device for the tail end of a steel strip in a line having a shear on the outlet side of a steel plate manufacturing facility that continuously processes a steel strip,
The winding device includes one deflector roll and two pressure rolls.
A winding device for the tail end of a steel strip, characterized in that the two pressure rolls have an inward inclination angle θ relative to the deflector roll, and the inward inclination angle θ is in the range of 1° or more and 20° or less.
[2] A steel strip tail end winding device as described in [1], characterized in that the inward inclination angles θ of the two pressure rolls are each independently variable.
[3] A winding device for the tail end of a steel strip as described in [1] or [2], characterized in that the pressing pressure of the two pressure rolls against the steel strip is independently variable.
[4] A steel strip tail end winding device according to any one of [1] to [3], characterized in that the two pressure rolls are each driven.
[5] A steel strip tail end winding device as described in [4], characterized in that the rotational speeds of the two pressure rolls are each independently variable.
[6] A method for winding a tail end portion of a steel strip using a winding device for the tail end portion of a steel strip according to any one of [1] to [5],
A method for winding the tail end of a steel strip, characterized in that the inward inclination angle θ of the two pressure rolls is in the range of 1 to 20°.
[7] A method for winding the tail end of a steel strip according to [6], characterized in that the pressure of the two pressure rolls against the steel strip is in the range of 0.05 to 0.55 MPa.
[8] A method for winding the tail end of a steel strip described in [6] or [7], characterized in that the component of the roll peripheral speed of the two pressure rolls in the direction of steel strip travel is within a range of ±15% of the travel speed of the tail end of the steel strip.
[9] A method for winding the tail end of a steel strip described in any one of [6] to [8], characterized in that a pressing pressure is applied to the steel strip by the two pressure rolls when the shear is ready to cut the tail end of the steel strip.
[10] A continuous steel strip processing facility comprising a winding device for the tail end of a steel strip according to any one of [1] to [5].

According to the present invention, in a line having a shear on the outlet side of a steel plate manufacturing facility that continuously processes steel strips, the inward inclination angle θ of two pressure rolls allows a force to be constantly applied to the tail end of the steel strip in the direction of the center of the line width, preventing the occurrence of winding slippage without causing scratches.

1 is a side view showing an outline of an example of a winding device according to the present invention. 1 is a plan view showing an outline of an example of a winding device according to the present invention. 1 is a schematic overhead view of an example of a winding device according to the present invention. 1 is a graph showing the relationship between the inward inclination angle θ and the incidence rate of winding deviation and the incidence rate of scratches. FIG. 1 is a side view showing a schematic diagram of an example of a conventional winding device.

Hereinafter, with reference to the drawings, first, an embodiment of a steel strip tail winding device according to the present invention (hereinafter, also referred to as the present invention device) will be described.
[Device Overview]
For example, as shown in the side view, plan view and overhead view of Figures 1, 2 and 3, the device of the present invention is a winding device for the tail end of a steel strip in a line having a shear 10 on the outlet side of a steel plate manufacturing facility (not shown) for continuously processing a steel strip S, and the winding device is equipped with one deflector roll 1 and two pressure rolls 2A and 2B for applying a pressing pressure to the steel strip S on the deflector roll 1. A tension reel 15 is provided downstream of the deflector roll 1.

The thickness of the steel strip S is in the range of 0.4 to 2.0 mm, and the width is in the range of 700 to 1,850 mm.

The rotation speed of the tension reel 15 ranges from 0 to 310 rpm. The distance from the shear 10 to the deflector roll 1 ranges from 6 to 10 m.

The diameter (roll diameter) of the deflector roll 1 is in the range of 800 to 1200 mm, and the barrel length (roll width) is made larger than the maximum width of the steel strip S so that it can contact the entire width of the steel strip S, and the ratio of the length to the maximum width of the steel strip S is in the range of 110 to 120%.

[Two pressure rolls]
Unlike the conventional apparatus which uses one pressure roll 2 (see FIG. 5), the apparatus of the present invention uses two pressure rolls 2A and 2B (see FIGS. 1 to 3).
The two pressure rolls 2A, 2B are flat rolls, and may be one pressure roll 2 divided into two in the body length (roll width) direction. The material of the pressure rolls 2A, 2B is preferably a rubber-lined roll that is less likely to scratch the steel strip S. The arrangement interval in the line width direction of the two pressure rolls 2A, 2B (the interval between the roll ends on the line width center LC side) is in the range of 100 to 200 mm to ensure installation space for a bearing (not shown) on the line width center LC side.

The pressure rolls 2A and 2B do not necessarily have to have the same roll dimensions, but it is preferable to have the same roll dimensions because the relationship between the pressing force on the steel strip S and the contact area (reflected in the frictional force) is the same for both rolls when the roll dimensions are the same, making it easier to control the frictional force. In addition, the diameter (roll diameter) of the pressure rolls 2A and 2B is smaller than that of the deflector roll 1 because the deflector roll is designed to have a large diameter to suppress plastic deformation of the steel strip, and the ratio of the diameter to that of the deflector roll 1 is in the range of 0.2 to 1.0. In addition, the body length (roll width) of the pressure rolls 2A and 2B is the dimension that protrudes outward from the plate width end of the steel strip S with the inward inclination angle θ described below.

[Inward tilt angle θ]
The two pressure rolls 2A and 2B are located above the deflector roll 1 on both sides of the line width center LC, and have an inward inclination angle θ with respect to the deflector roll 1 (see Figures 2 and 3). Here, the inward inclination angle θ means the rotation angle when the pressure rolls 2A and 2B are rotated from a position directly above the deflector roll 1 so that the roll end on the line width center LC side is displaced upstream in the traveling direction of the steel strip S. From the viewpoint of simplifying the device, it is preferable to set the position of the center of rotation to approximately the center point of the barrel length of each of the pressure rolls 2A and 2B (the barrel length direction distance from the center point is within 0±0.1 × barrel length).
By providing the inward inclination angle θ, the two pressure rolls 2A and 2B each exert forces FA and FB in the direction of the line width center LC on the steel strip S due to friction through the contact surface with the steel strip S. In a state in which the strip width center SC of the steel strip S is offset from the line width center LC, for example, toward the pressure roll 2A side (FIGS. 2 and 3), FA>FB, and the resulting force F in the direction from the strip width center SC to the line width center LC (hereinafter also simply referred to as force F) acts to counteract the offset of the strip width center SC from the line width center LC, thereby suppressing the winding slippage. Conversely, in a state in which the strip width center SC is offset from the line width center LC toward the pressure roll 2B side (not shown), FA<FB, and the resulting force F acts to counteract the offset of the strip width center SC from the line width center LC, thereby suppressing the winding slippage.

[Range of inward inclination angle θ]
It is believed that if the inward inclination angle θ is too small, the force F (see Figures 2 and 3) will be too weak and will not be effective in suppressing winding slippage, and conversely, if the inward inclination angle θ is too large, the force F will be too strong and will cause scratches on the steel strip S. Therefore, the inventors conducted an experiment (actual machine experiment) to determine the appropriate range of the inward inclination angle θ using an actual machine in which the conventional winding device shown in Figure 5 was modified to the form shown in Figures 1 to 3 (two pressure rolls 2A, 2B were used instead of one pressure roll 2).
In this actual machine, as a preferred embodiment described later, the inward inclination angle θ of the two pressure rolls 2A, 2B was made variable independently. The pressures of the two pressure rolls 2A, 2B against the steel strip were made variable independently. The two pressure rolls 2A, 2B were each driven, and their rotation speeds were made variable independently.

The test material was steel strip S, the type with the highest processing rate of approximately 5% of the total (steel type = low carbon steel, plate thickness = 1.0 mm, plate width = 1000 mm), and some of the winding conditions were the conditions that had been conventionally set for this test material (two distances from shear 10 to deflector roll 1: 6 m and 10 m; deflector roll 1 coating material = Hypalon, diameter = 800 mm, body length = 2100 mm).

Under these conditions, the two pressure rolls 2A and 2B were made of rubber-lined rolls (the same as the conventional one, hereafter referred to as the conventional one), with a diameter of 300 mm (the conventional one), and a body length of 900 mm (2100 mm for the conventional one).

The operating conditions here were that the inward tilt angle θ and pressing pressure of the two pressing rolls 2A and 2B were the same, they were operated in an undriven state (conventional), and the pressing pressure was 0.2 MPa (conventional).

The pressure rolls 2A and 2B come into contact with the steel strip S when the tip of the steel strip S is wound around the tension reel 15, applying pressure (as in the conventional method).

The inward inclination angle θ was then varied between multiple levels within the range of 0 to 45°, and the incidence of winding misalignment and scratches at the tail end of the coil after winding was investigated.

The occurrence rates of winding misalignment and scratches were expressed as a percentage of the total number of coils for each level of inward tilt angle θ, based on the number of coils that were determined to have winding misalignment and scratches at the tail end of the coil on the inspection line in the next process.

The results of the above-mentioned actual machine experiment are shown in a graph in FIG. 4, which shows the relationship between the winding deviation occurrence rate and the scratch occurrence rate and the inward inclination angle θ. As shown in FIG. 4, the winding deviation occurrence rate is high at 20% when the inward inclination angle θ is 0°, but decreases to 10% or less (the allowable range in this embodiment) when the inward inclination angle θ is 1° or more, and further decreases to almost 0% when the inward inclination angle θ is 7° or more. On the other hand, the scratch occurrence rate is almost 0% when the inward inclination angle θ is 20° or less, but increases significantly when the inward inclination angle θ exceeds 20°. Based on this result, the inward inclination angle θ is limited to a range of 1° or more and 20° or less. The range is preferably 7° or more and 20° or less.
Furthermore, in the present invention, the steel strip S is not restrained from the strip edge side, so that no damage is caused to the strip edge.

[Two independent inward tilt angles θ]
In the device of the present invention, it is preferable to independently vary the inward inclination angle θ (hereinafter, also referred to as the angle θ for short) of the two pressing rolls 2A, 2B. In this way, when the two angles θ are the same and there is a tendency for the deviation of the strip edge to increase toward either the left or right side in the line width direction as the coil winding order increases, the angle θ on the side with the deviation can be made larger than that on the opposite side, thereby reversing the increasing tendency of the deviation of the strip edge to a decreasing tendency.
[Two independent pressure controls]
In the device of the present invention, it is preferable to vary the pressure applied to the steel strip by the two pressure rolls 2A, 2B independently. In this way, when the pressure applied to the two pressure rolls is the same and there is a tendency for the strip edge to be more biased to one of the left and right sides in the line width direction in the later coil winding order, the pressing pressure on the side with the bias can be made greater than that on the opposite side, thereby reversing the increasing tendency of the strip edge bias to a decreasing tendency.
[Driven pressure roll]
In the apparatus of the present invention, it is preferable that each of the two pressure rolls 2A, 2B is of the driven type (undriven operation is also possible). With this, if scratches occur on the steel strip due to slippage with the pressure rolls during undriven operation, it is possible to switch to driven operation and reduce the slippage by adjusting the rotation speed, thereby preventing the occurrence of scratches.
[Two independent variable rotation speeds]
In the device of the present invention relating to the above-mentioned driving type of the pressure roll, it is further preferable to make the rotation speed of the two pressure rolls 2A, 2B independently variable. With this, when the rotation speeds of the two rolls are the same and there is a tendency for the deviation of the strip edge to increase to one of the left and right sides in the line width direction in the later coil winding order, the rotation speed of the side with the deviation is made faster than that of the opposite side, thereby reversing the increasing tendency of the deviation of the strip edge to a decreasing tendency.
Next, an embodiment of a coiling method for the tail end of a steel strip according to the present invention (hereinafter, also referred to as the present invention method) will be described. The present invention method uses the above-mentioned present invention device.

[Range of inward inclination angle θ]
In the method of the present invention, the inward inclination angle θ (angle θ for short) is set in the range of 1 to 20°. As a result, as shown in Fig. 4, when the angle θ is 1° or more, the occurrence rate of winding deviation is 10% or less (the allowable range in this embodiment), while when the angle θ is 20° or less, the occurrence rate of scratches is almost 0%. Furthermore, since the occurrence rate of winding deviation is almost 0% when the angle θ is 7° or more, the angle θ is preferably in the range of 7 to 20°.
[Pressing pressure range]
In the method of the present invention, the pressure of the two pressing rolls 2A, 2B against the steel strip S is preferably in the range of 0.05 to 0.55 MPa. If the pressure is less than 0.05 MPa, the effect of preventing winding slippage may be insufficient, and if it exceeds 0.55 MPa, scratches may occur.
[Press roll peripheral speed]
In the method of the present invention, it is preferable that the component of the roll circumferential speed of the two pressure rolls 2A and 2B in the steel strip traveling direction is within a range of ±15% of the traveling speed of the tail end of the steel strip. If the component of the roll circumferential speed of the pressure rolls 2A and 2B in the steel strip traveling direction is out of the range of ±15% of the traveling speed of the tail end of the steel strip, the slip between the pressure roll and the steel strip becomes excessive, which may cause scratches. Here, the component of the roll circumferential speed of the pressure roll in the steel strip traveling direction is calculated by the formula "pi x diameter of the pressure roll x rotation speed x cos (inward inclination angle θ)" (hereinafter referred to as "Formula 1"). The traveling speed of the tail end of the steel strip is calculated by the formula "pi x nominal coil outer diameter x rotation speed of the tension reel 15". The rotation speed of the pressure rolls 2A and 2B and the rotation speed of the tension reel 15 are measured by a revolution meter (not shown) attached to each roll. To adjust the value of formula 1 without replacing the pressure roll and changing the angle θ, if the pressure roll is a non-driven type, the rotation speed cannot be directly operated, but the rotation speed can be changed by changing the pressing pressure to adjust the value of formula 1. If the pressure roll is a driven type, the value of formula 1 can also be adjusted by directly operating the rotation speed.

[Timing of applying pressure]
In the method of the present invention, it is preferable to apply a pressing pressure to the steel strip S with the two pressure rolls 2A, 2B at the time when the shear 10 is ready to cut the tail end of the steel strip.
Before the preparation state is reached, a certain tension is applied to the steel strip S, and winding slippage hardly occurs. After the preparation state is reached, the tension of the steel strip S decreases so that the tension of the steel strip S does not suddenly become 0 during shear cutting, and winding slippage becomes more likely to occur. Therefore, in order to prevent winding slippage, pressing pressure may be applied at the time when the preparation state is reached. On the other hand, in order to prevent scratches, it is best not to apply pressing pressure as much as possible. Therefore, it is preferable to apply pressing pressure to the steel strip S at the time when the preparation state is reached. The time when the preparation state is reached may be set as a time a predetermined time before the scheduled time when the joint (welding point, not shown) between the preceding material and the following material currently being wound passes through the shear 10.
[Continuous processing equipment according to the present invention]
The continuous steel strip processing equipment according to the present invention has the above-mentioned device of the present invention, and therefore can obtain a continuously processed product free from scratches and winding slippage.

As examples, the winding conditions were variously changed using the actual machine, and the occurrence rates of winding misalignment and scratches were investigated in the same manner as in the actual machine experiment.
[Example 1]
In Example 1 of the present invention, the steel strip S was of a different type from that used in the practical machine experiment (steel type = 590 MPa class high tensile steel plate, plate thickness = 1.8 mm, plate width = 920 mm), and the inward inclination angle θ (abbreviated as angle θ) was set to two levels, 5° and 15°, and winding was performed under the same conditions as in the practical machine experiment. As a result, when the angle θ was 5°, the winding slippage occurrence rate and the scratch occurrence rate were 4% and 0%, respectively, and when the angle θ was 15°, both were 0%, which were good results in both cases.
[Example 2]
In Example 2 of the present invention, the steel strip S was the same as in the actual machine experiment in Example 1 of the present invention, the timing for applying pressure to the steel strip was the point at which it became ready to be cut by the shear 10, and the other conditions were the same as in Example 1 of the present invention. As a result, when the angle θ was 5°, the winding slippage occurrence rate and the scratch occurrence rate were 4% and 0%, respectively, and when the angle θ was 15°, both were 0%, which were all good results.
[Example 3]
In Example 3 of the present invention, the steel strip S in Example 2 of the present invention was of a type that was prone to winding slippage (steel type = SUS409, plate thickness = 1.0 mm, plate width = 950 mm) different from that in Example 2 of the present invention, the angle θ was set to 10°, and the other conditions were the same as those in Example 3 of the present invention. As a result, the winding slippage occurrence rate was 10% (upper limit of the allowable range), and the scratch occurrence rate was 0%, both of which were good results. The winding slippage in this case tended to occur with the plate width center SC biased toward the pressure roll 2A side from the line width center LC.
[Example 4]
In Example 4 of the present invention, the angle θ of the pressure roll 2A in Example 3 of the present invention was increased from 10° to 15°, and the other conditions were the same as those in Example 3 of the present invention. As a result, compared to Example 3 of the present invention, the scratch occurrence rate remained at 0%, and the winding misalignment occurrence rate was improved to 5%.
[Example 5]
In Example 5 of the present invention, the pressing pressure of the pressing roll 2A was increased by 20% in Example 3 of the present invention, and the other conditions were the same as those of Example 3 of the present invention. As a result, compared to Example 3 of the present invention, the scratch occurrence rate remained at 0%, and the winding misalignment occurrence rate was improved to 7%.
[Example 6]
In Example 6 of the present invention, the pressure roll 2A in Example 3 of the present invention was driven and its roll peripheral speed was 10% faster than that of the pressure roll 2B in the same direction as that of the pressure roll 2B, and the other conditions were the same as those of Example 3 of the present invention. As a result, compared to Example 3 of the present invention, the scratch occurrence rate remained at 0%, and the winding misalignment occurrence rate was improved to 8%.
[Comparative Example 1]
In Inventive Example 1, the angle θ was set to two levels, 0° and 25°, and the other conditions were the same as those of Inventive Example 1. As a result, when the angle θ was 0°, the scratch occurrence rate was 0%, but the winding deviation occurrence rate was 20%, which was outside the allowable range (10% or less). On the other hand, when the angle θ was 25 degrees, the winding deviation occurrence rate was 0%, but the scratch occurrence rate was high at 12%.

1 Deflector roll 2, 2A, 2B Presser roll 10 Shear (exit shear)
15 Tension reel F, FA, FB Force LC Line width center S Steel strip SC Plate width center θ Inward inclination angle

Claims (8)

A winding device for a tail end of a steel strip in a line having a shear on the outlet side of a steel plate manufacturing facility that continuously processes a steel strip, comprising:
The winding device includes one deflector roll and two pressure rolls.
The two pressure rolls have an inward inclination angle θ with respect to the deflector roll, and the inward inclination angle θ is in the range of 1° to 20°,
The two pressing rolls are each driven,
A winding device for the tail end of a steel strip, characterized in that the rotational speeds of the two pressure rolls are independently variable . The winding device for the tail end of a steel strip as described in claim 1, characterized in that the inward inclination angle θ of each of the two pressure rolls is independently variable. A winding device for the tail end of a steel strip as described in claim 1 or 2, characterized in that the pressure applied to the steel strip by the two pressure rolls is independently variable. A method for winding a tail end of a steel strip using the winding device for the tail end of a steel strip according to any one of claims 1 to 3 , comprising the steps of:
A method for winding the tail end of a steel strip, characterized in that the inward inclination angle θ of the two pressure rolls is in the range of 1 to 20°. A method for winding the tail end of a steel strip as described in claim 4 , characterized in that the pressing pressure of the two pressure rolls against the steel strip is in the range of 0.05 to 0.55 MPa. A method for winding the tail end of a steel strip as described in claim 4 or 5, characterized in that the component of the roll peripheral speed of the two pressure rolls in the direction of steel strip travel is within a range of ±15% of the travel speed of the tail end of the steel strip. A method for winding the tail end of a steel strip as described in any one of claims 4 to 6, characterized in that a pressing pressure is applied to the steel strip by the two pressure rolls when the shear is ready to cut the tail end of the steel strip. 4. A continuous steel strip processing facility comprising a winding device for winding the tail end of a steel strip according to claim 1.

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