JP3313313B2 - Method and apparatus for winding or paying out metal strip coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for winding or unwinding a metal strip coil.

[0002]

2. Description of the Related Art For example, in a process line for continuously processing steel strips, when winding or unwinding a steel strip coil using a winding machine or a rewinding machine, crimping flaws due to mutual friction between the steel strips. A type of so-called scratch may occur. This compression flaw is apt to occur particularly in a softened state after strain relief annealing after cold rolling. Once such a pressure flaw is generated, it is impossible to correct it, which greatly reduces the product yield, especially the first-class rate.

[0003] It is known that the cause of such pressure-bonding flaws is that the coil oscillates when winding or unwinding the steel strip coil in a winder or a rewinding machine. In other words, this horizontal run-out is made one cycle by one rotation of the swing motion caused by the center axis of the coil wound (or paid out) on the reel being inclined with respect to the reel axis,
The swing width becomes maximum in half a round, and if left unchecked, the swing further increases. In particular, it has been pointed out that in a line for processing a material having an extremely small thickness such as an original tin plate, the line speed is high, so that the lateral deflection of the coil is likely to be large, and as a result, the occurrence of pressure flaws is high.

[0004] By the way, as an attempt to prevent the occurrence of the lateral runout as in the prior art described above, if the cause of the lateral runout is due to the backlash of the reel, the reel is pressed down, and the end of the protruding steel strip is pressed. Although it is conceivable to suppress the inclination of the reel by applying a pressing pressure or the like, merely fixing the reel may cause the tip to be wound around the reel shaft depending on the shape of the plate, for example. In addition, it may be caused by plate thickness, such as a defective cross-sectional shape called a high spot of the metal band itself as shown in FIG. 10 or a so-called crown having a large difference between the center portion and the edge portion as shown in FIG. However, there is a problem that the lateral shake cannot be sufficiently suppressed.

As means for preventing the generation of flaws due to lateral run-out, for example, Japanese Patent Application Laid-Open No. 7-80545 discloses a method in which a steel strip wound in a coil shape in a winding process of a steel strip by a tension reel is provided with two ends. The distance to the measurement reference point is measured continuously, and the difference between the distances on both sides is 1
A method has been disclosed in which the winding of the steel sheet is temporarily stopped and cut at the time when the diameter of the coil becomes equal to or more than mm to perform the coil dividing process.However, this method also changes the coil unit weight irregularly in time. This also has the disadvantage of adversely affecting productivity.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a metal strip capable of preventing the occurrence of lateral run-out by simple means. It is an object of the present invention to provide a method and an apparatus for winding or discharging a coil.

[0007]

SUMMARY OF THE INVENTION The present invention measures the lateral deflection of a metal band coil when winding or unwinding the coil, and determines the tension of the metal band during winding or unwinding according to the amount of lateral deflection. adding to control a winding or payout method for a metal strip coil, characterized in.

In the present invention, the tension applied to the metal band comprises a tension set value at the time of winding or unwinding and an additional tension value added thereto, and the additional tension value is a value in which the lateral deflection amount is set in advance. When the threshold value is exceeded, it is preferable that the threshold value is determined to be added in accordance with the difference between the amount of lateral shake and the threshold value. Further, the present invention is an apparatus for winding or paying out a metal band coil using a take-up reel or a pay-out reel, wherein a coil lateral vibration detecting means for detecting a lateral vibration amount of the coil; Tension detecting means for detecting the tension at the time of dispensing, and tension controlling means for controlling the winding or dispensing tension of the metal band and increasing the winding or dispensing tension in accordance with the detected lateral deflection amount. An apparatus for winding or discharging a metal strip coil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
1 is a side view showing the configuration of an embodiment of the present invention, in which a take-up reel 1 is rotationally driven by a drive motor (not shown). A bridle roll 2 is driven to rotate by a drive motor 3. Reference numeral 4 denotes a tension detector such as a tension meter roll, and 5 denotes a pass line roll provided before and after the tension detector 4. The steel strip S conveyed from the bridle roll 2 via the tension detector 4 is wound. It is wound in a coil shape by the take-up reel 1.

Reference numeral 6 denotes a coil deflection detector such as a laser displacement meter or an ultrasonic range finder, which is disposed on the outer peripheral surface or the side surface of the coil to measure the distance to the coil. As a result, if a lateral vibration occurs in the coil being wound, the distance varies, so that the coil can be detected as a lateral vibration. Reference numeral 7 denotes a tension control device to which detection signals from the tension detector 4 and the coil deflection amount detector 6 are input.
The winding tension set value T _S is set in advance in the tension controller 7.

FIG. 2 shows a concrete example of the means for detecting the lateral deflection of the coil.
Shown in In FIG. 2, reference numerals 6a and 6b denote distance meters such as a laser displacement meter for detecting the positions of the coil outer peripheral surfaces on the operator side and the drive side, respectively. These distance meters 6
The distance to the outer peripheral surface of the coil is detected using the positions a and 6b as measurement reference points. 3 and 4 show the distance meters 6a, 6
FIG. 3 shows a time change of the distance detected by b. FIG. 3 shows a case of a normal coil, and FIG. 4 shows a case of a coil in which a lateral vibration occurs.

In a normal coil, as shown in FIG. 3, the operator-side distance L _OP and the drive-side distance L _DR change almost equally. Here, the fact that L _OP and L _DR gradually decrease is a change corresponding to an increase in the coil diameter due to winding, and the _reason that L _OP and L _DR change periodically is that the coil shape is strictly a perfect circle. This is because it may deviate slightly. Note that L _OP and L _DR
Are shown slightly apart.

On the other hand, when the lateral shake occurs, as shown in FIG. 4, L _OP and L _DR change with different phases while maintaining the periodicity, and accordingly, L _OP −L _DR also changes with the periodicity.
Since the degree of the magnitude of the lateral deflection corresponds to the absolute value of L _OP -L _DR, ΔL = | defined and laterally shake amount the maximum value of [Delta] L in one cycle when the | L _OP -L _DR. The criticality setting for judging the presence / absence of lateral run-out is desirably set to a value that can sufficiently suppress the occurrence of crimping flaws while suppressing excessive lateral run-out detection. Specifically, when ΔL <0.5 mm, it is desirable that there is no lateral vibration.

FIG. 5 shows another means for detecting coil lateral vibration.
A specific example will be described. In FIG. 5, 6c is the drive side.
(May be installed on the operator side) at the end of the coil side
It is a distance meter such as a laser displacement meter that detects the position. Rangefinder
6c as a measurement reference point, and
Release L '_DR(If the rangefinder is on the operator side, L '_OP,
Hereinafter the same) is detected. Fig. 6 shows the case where
Time of the distance detected by the distance meter 6c
It shows the change. Where the average of the time change of the distance
Value or median (no significant difference in either case)
Is distance zero, and L ' _DRThe maximum amplitude from the zero point of the coil
Is defined as a quantity. In this case, too,
Threshold L_SHIt is desirable to decide.

[0015] Of the methods shown in FIGS. 2 and 5 exemplified as the coil lateral deflection detecting means, the method shown in FIG. 2 enables measurement without depending on the coil diameter.
Each has a feature in that the calculation of the amount of lateral shake is simpler than the method of FIG. The operation of the control based on the detection result of the lateral shake will be described. If the amount of lateral deflection is less than the above critical value (normal coil), the tension control device 7 drives the bridle roll 2 such that the value detected by the tension detector 4 becomes equal to the tension set value T _S during winding. The load current of the drive motor 3 is adjusted.

On the other hand, when the amount of lateral vibration is equal to or more than the critical value, the lateral vibration is corrected by adding an appropriate tension to the tension set value T _S and adding the tension to the winding tension. According to the knowledge of the present inventors, the lateral shake can be corrected only by applying an appropriate tension, but the appropriate tension differs depending on the amount of lateral shake. FIG. 7 is a graph showing the relationship between the amount of lateral vibration (measured by the method of FIG. 2) and the minimum additional (winding) tension required to correct the lateral vibration, which was obtained as a result of an investigation under various conditions. It shows the relationship. Of course, this relationship changes quantitatively depending on the equipment, but the tendency that the tension to be added increases in accordance with the amount of lateral shake is the same.

Therefore, the tension control device 7 calculates the amount of lateral vibration from the reference end position using the output of the coil vibration amount detector 6, and accordingly adds the additional tension value T _UP during winding necessary for correction. Is added to the tension set value T _S at the time of winding, and the load current of the drive motor 3 for driving the bridle roll 2 is adjusted to be equal to the tension. Figure 7 above
The tension set value T _S at the time of winding is set to 2.0 kgf / mm ^2, and the added tension value T _UP to be added to the set value is set to 3.0 kg.
^{kgf / mm 2, 3.5 kgf /} mm 2, 4.0kgf / mm 2, 4.5 kgf / mm 2
This is an example showing the increase and decrease of the coil lateral deflection amount when the above is set. However, the magnitude of the added tension value may be determined based on such a relationship (regardless of actual measurement, model formula, and the like).

It is desirable that the once set additional tension value is fixed until the lateral runout is eliminated (ΔL falls below the critical value), and when the lateral runout is eliminated, the additional load is stopped and the load tension is returned to T _S. It is also possible to reset the additional amount while tracking ΔL until the lateral vibration is eliminated, but this is not particularly necessary since the lateral vibration is eliminated in a relatively short time after the addition of the tension.

Here, a supplementary description will be given of a method of adding the above-mentioned additional tension value T _UP with high accuracy in accordance with the amount of lateral vibration measured by the method of FIG. Now, for example, on the drive side, as shown in FIG. 6, a fixed threshold level L _SH (for example, 3 mm) is previously set at the upper and lower limits with respect to the reference end position L ₀ where the coil does not swing. Then, as shown in FIG. 8, 'when _{the DR} exceeds the level of the threshold L _SH, for example the difference ΔL between the threshold' coil lateral deflection of _{L DR (= L 'DR -L} SH) Is added to the winding tension set value T _S so as to be proportional to the tension value T _UP ,
Control to increase the winding tension is performed. In this way, by applying only the necessary tension in accordance with the amount of lateral vibration, it is possible to prevent the metal strip from being elongated due to excessive tension.

Although the above example has been described for a take-up reel, the present invention can be similarly applied to a pay-out reel. In other words, the cause of the lateral runout at the time of dispensing is a state in which the coil runs out during the winding, that is, a case in which the reeled coil is paid out with the actual axis of the coil shifted from the reel axis, or even if the coil is normal. Since there is a case where the setting to the payout reel is defective, in such a case, the lateral run-out can be suppressed by applying a tension by adjusting the rotation speed of the payout reel, for example.

Although the above-described example describes the case where the steel strip is wound or paid out, the present invention is not limited to this. For example, the same applies to a non-ferrous metal strip such as aluminum. Needless to say, it can be applied to

[0022]

EXAMPLE The method of the present invention was applied to a tension reel for winding a coil of a cold rolling process line. At this time, an ultrasonic distance meter was used as the coil deflection detector. The result is shown in FIG.
As shown in the figure, the occurrence of crimping flaws was 0.25%, which was
% Can be reduced to about お よ そ in the example of the present invention as compared with%, and it is clear that the effect is large.

[0023]

As described above, according to the present invention,
Lateral run-out of the coil on the take-up reel and the pay-out reel can be suppressed, and the occurrence of pressure flaws can be drastically reduced, thereby greatly improving the first-class rate of the product.

[Brief description of the drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing a means for detecting a coil lateral deflection amount, wherein FIG. 2A is a side view and FIG. 2B is a plan view.

FIG. 3 is a characteristic diagram showing a time change of a measurement result by a distance meter in a normal coil.

FIG. 4 is a characteristic diagram showing a change over time of a measurement result obtained by a distance meter using a lateral vibration generating coil.

FIGS. 5A and 5B are explanatory views showing another example of the coil lateral deflection detecting means, wherein FIG. 5A is a side view, and FIG. 5B is a view taken along line AA of FIG.

FIG. 6 is a characteristic diagram illustrating setting of a threshold value for a coil lateral deflection amount.

FIG. 7 is a characteristic diagram showing a relationship between a coil lateral deflection amount and a winding tension.

FIG. 8 is a characteristic diagram illustrating an example of a relationship between a coil lateral deflection amount and an added tension value.

FIG. 9 is a characteristic diagram showing the rate of occurrence of pressure flaws.

FIG. 10 is a characteristic diagram showing a conventional example of occurrence of a high spot.

FIG. 11 is a characteristic diagram showing a conventional example of crown generation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Take-up reel 2 Bridle roll 3 Drive motor 4 Tension detector (tension detection means) 5 Pass line roll 6 Coil runout detector (Coil lateral runout detection means) 6a, 6b, 6c Distance meter 7 Tension control device (Tension control) Means) S Steel strip (metal strip) T _S Winding tension setting value (Tension setting value) T _UP Additional tension value L Distance from the distance meter on the outer surface of the _OP coil (operator side) L Distance meter with the outer surface on the _DR coil Distance (drive side) L 'Distance from _DR coil side end distance meter (drive side) L ₀ Reference end position L _SH threshold

────────────────────────────────────────────────── ─── Continuing on the front page (51) Int.Cl. ⁷ Identification code FI B65H 23/198 B65H 23/198 Z (72) Inventor Naoya Sato 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Steel Corporation In-house (72) Inventor Mitsuru Ogawa 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (56) References JP-A-7-80545 (JP, A) U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 47/00 B21C 51/00

Claims (3)

(57) [Claims] When winding or paying out a metal band coil, a lateral runout of the coil is measured, and the tension of the metal band at the time of winding up or paying out is added according to the amount of the lateral runout to control the coil. > A method of winding or paying out a metal band coil, which is controlled. 2. The tension applied to the metal band comprises a tension set value at the time of winding or unwinding and an additional tension value added thereto, and the additional tension value is a threshold value at which the lateral deflection amount is set in advance. At the time of exceeding the threshold value, it is determined to add according to the difference between the lateral shake amount and the threshold value. Payment method. 3. An apparatus for winding or paying out a metal band coil using a take-up reel or a pay-out reel, comprising: a coil lateral vibration detecting means for detecting a lateral vibration amount of the coil;
Tension detecting means for detecting the tension at the time of winding or unwinding the metal band, and tension for controlling the winding or unwinding tension of the metal band and increasing the winding or unwinding tension in accordance with the detected lateral swing amount. A winding or dispensing device for a metal band coil, comprising a control unit.