JPH0976014A - Method for coiling steel strip and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of end mark in a steel strip by continuously executing correcting control of the positional deviation between the tracking position of the tip of the steel strip and the position of step adjusting part. SOLUTION: The steel strip 1 is coiled with a mandrel 6 on which a sleeve 7 with step adjusting part is armored. Then, the position of the tip of the steel strip 1 in advancing, moving speed and the position of the step adjusting part in revolving are respectively detected with detectors C1, C2, C4. The rotational angle and speed of the mandrel 6 are controlled so that the position of the step adjusting part in revolving is mated with the position of the tip of the steel strip in advancing. Just before starting coiling, the position of the tip of the steel strip 1 is again detected with the detector C1 and correcting control is executed so as to eliminate the positional deviation between the position of the tip of the steel strip and the position of the step adjusting part. Further, even after the steel strip is wound around, the correcting control of the positional deviation between the tracking position of the tip of the steel strip 1 and the position of the step adjusting part is continuously executed. In this way, the yield of products is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a steel strip and an apparatus for winding the steel strip around a mandrel to prevent the generation of end marks on the coil.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing a conventional example of a steel strip winding device.

Conventionally, a steel strip 1 rolled by a cold rolling mill or the like, as shown in FIG. 4, passes through a pinch roll 3, a deflector roll 4, a threading table 5 and a cylindrical mandrel 6 which is rotated by a motor 11. To be wound up. At this time, the tip 1a of the steel strip 1 is wound while being guided by the belt wrapper 10 in which the belt is wound around the wrapper roll 9.

FIG. 5 is an explanatory view of the generation of the end mark. The plate is bent and the mark is generated in the portion 1c after the second winding which overlaps the steel strip front end 1a. This is called the end mark.

When the steel strip is wound on the mandrel, the end mark is generated in several to several tens of turns on the inner diameter side of the coil due to the step at the tip of the steel strip, and the yield is reduced by cutting off this portion.

In order to prevent the occurrence of this end mark,
There are countermeasures such as temporarily stopping the line at the time of winding the front end and inserting a gap material such as corrugated board, but the end mark is not always lost. Moreover, this method is not widely adopted these days because of safety concerns. Furthermore, in an automatic operation line, stopping the output side device directly hinders production.Therefore, as a means to reduce the stop time as much as possible and prevent end marks, a mandrel is equipped with a stepped rubber sleeve, etc. A method is adopted in which winding is started after the positions of the tip and the stepped portion are automatically matched.

For example, the following inventions have been proposed as recent prior art.

(1) FIG. 4 shows a method of winding a steel strip proposed in JP-A-6-7839. In this method, the tip touch sensor 1 is attached to the stepped portion of the stepped sleeve 7.
6 is provided so that the stepped portion is stopped at a predetermined position in advance, and the mandrel is rotated when the tip 1a of the steel strip advances and comes into contact with this tip touch sensor. For this reason, the tip of the steel strip can be reliably positioned on the stepped portion, whereby the second and subsequent steel strips can be wound in a stepless state.

(2) FIG. 3 is a side view of a rubber sleeve with a hollow portion proposed in Japanese Patent Laid-Open No. 7-9029.
By controlling the position where the tip of the steel strip is aligned with the hollow portion 15 of the rubber sleeve 7, the tip of the steel strip is depressed (same effect as the stepped portion) to prevent the occurrence of end marks.

(3) In JP-A-2-263515, after the stepped portion of the stepped sleeve is detected by a sensor and stopped at a predetermined position, the tip of the tracked steel strip is stepped while stopped. It has been proposed to abut the section and start winding.

[0011]

However, the methods (1) to (3) described above also have the following problems. The problems of the method proposed in JP-A-6-7839 of (1) above are the following three points.

This is a problem of the detection accuracy of the tip touch sensor. That is, in order to detect the tip touch with high accuracy, it is desirable to make the sensing surface of the touch sensor as small as possible, but if it is made too small, the touch cannot be detected reliably under certain conditions, such as micro-deformation of the steel strip tip. A large area is naturally required to secure the sex. In the publication, the value is described as φ10 mm or less, but an error of about ± 5 mm can occur, and in the embodiment of the publication, φ5 mm.
Therefore, an error of ± 2.5 mm can occur.

An error (± several tens mse) due to a timing shift when the mandrel which is stopped is activated by touch detection.
± several mm as the difference of c).

Immediately after the mandrel is activated and before the steel strip is tightened to prevent slipping (until the completion of at least one winding), an error (usually the maximum value) caused by the uniform speed control error between the mandrel peripheral speed and the steel strip moving speed. ± Several 10 mm as a difference of ± 0.1% of the line speed). That is, the evaluation of the positioning control may be within ± several mm when the mandrel is activated, but if it is extended to the time when the winding is tightened, a total error of ± several tens of mm may occur.

In the stepped sleeve, the accuracy of alignment between the front end of the steel strip and the stepped portion required to prevent the end mark is 15 mm or less (10 mm in some cases).
It is also said that it is within), and the method of (1) above is insufficient.

In the method proposed in Japanese Patent Application Laid-Open No. 7-9029 (2), high-precision positioning is an essential condition, but the positioning control method is only tracking and the tip of the steel strip. (1) to detect the touch sensor
It cannot be said that this method is superior in positioning accuracy to the above method.
Also, the peripheral dimensions of the cavity must be changed according to the conditions such as the thickness of the steel strip, and it is economically impractical to prepare a considerable number of expensive special rubber sleeves.

The method proposed in JP-A-2-263515 of (3) above is a positioning control method which is almost the same as the above-mentioned method (2), and similarly to the method (1). It cannot be said that the positioning accuracy is excellent at least.

Problems common to the above methods (1) to (3) are as follows.

(A) The stepped portion or hollow portion on the sleeve to be aligned with the steel strip tip is made to stand by at a predetermined position (mandrel is stopped), and the steel strip tip is placed on the stepped portion or the like. The mandrel is started at the moment when it is determined that the mandrel has arrived, and the method of matching the sleeve peripheral speed with the steel strip speed is used. ).

(B) After the mandrel is activated, the position correction control and the like are not carried out based on the idea that "the sleeve peripheral speed and the steel strip speed should match". Certainly, there is also the idea that after the start of winding, the belt wrapper (reference numeral 10 in Fig. 4) is used for restraining it. In particular, a positional deviation may occur from the half turn to the first turn (there may be ± 10 mm).

The present invention has been made in view of the above-mentioned problems of the prior art, and in a mandrel having a stepped sleeve or a stepped portion for adjusting a step at the tip of a steel strip such as a hollow portion,
An object of the present invention is to provide a method and an apparatus for winding a steel strip which prevents the occurrence of end marks on the steel strip by performing the alignment between the tip of the steel strip and the step adjusting portion of the sleeve with high accuracy (approximately within 10 mm). .

[0022]

SUMMARY OF THE INVENTION The present invention relates to a method for winding a steel strip with a mandrel having a sleeve with a step adjusting portion at the tip of the steel strip such as a stepped portion or a hollow portion. The main idea is to carry out the procedure.

Steel strip tip position and moving speed in progress,
In addition, the position of the step adjusting portion during rotation is detected.

The rotation angle and speed of the mandrel are controlled so that the position of the step adjuster in rotation matches the position of the tip of the steel strip in progress.

Immediately before the start of winding, the tip position of the steel strip is detected again.

The tracking position of the front end of the steel strip is corrected by the detected value of the front end position of the steel strip.

Correction control is performed so as to eliminate the positional deviation between the tracking position of the front end of the steel strip and the position of the step adjusting portion.

Further, about 3 turns from the start of winding,
The correction control for eliminating the positional deviation between the tracking position of the front end of the steel strip and the position of the step adjusting portion is continuously performed.

The present invention also relates to a steel strip winding device having a mandrel having a sleeve with a step adjusting portion at the tip of the steel strip, such as a stepped portion or a hollow portion, which is provided. It is characterized by including.

Steel strip tip position detection means for detecting the ongoing steel strip tip position.

Moving speed detecting means for detecting the moving speed of the front end of the steel strip.

Position detecting means for detecting the angle and the peripheral speed of the step adjusting portion mounted on the mandrel.

Uniform speed control means for controlling the rotation angle and speed of the mandrel so that the position of the step adjuster during rotation matches the position of the tip of the steel strip in progress.

Position deviation detecting means for detecting a positional deviation between the tip end position of the steel strip and the position of the step adjusting portion.

Position deviation correction control means for correcting the position of the step adjusting portion so as to eliminate the position deviation detected above.

[0036]

1 is a side view and a block diagram of a winding apparatus for a steel strip in which the method of the present invention has been carried out. The present invention will be described in more detail with reference to FIG.

First, the steel strip tip position detecting means C1 in progress.
For example, the optical first tip detector S2 and the measuring roll 2 are used in combination. Normally, position detection is generally performed by processing the signal of a pulse generator attached to the axis of the in-line drive motor, but there is a problem of slippage, and recent technologies include non-contact length measuring instruments. However, there is a limit to the accuracy, and in the present invention, it is indispensable to detect the tip end position of the steel strip with high precision (within several mm). Therefore, it is desirable to intentionally use a high precision one such as a measuring roll system. Further, as the moving speed detecting means C2, the detected position value is differentiated with respect to time to calculate and use the moving speed of the front end of the steel strip.

In the position deviation detecting means C3, the position of the tip of the steel strip which is detected in this way is detected by the position deviation detecting means C3. The deviation is output as compared with the position of the stepped portion of the sleeve which is covered by the mandrel and detected by the means C4. Then, if there is a positional difference between the ongoing steel strip tip position and the stepped portion position in the uniform speed control means C5, the peripheral speed of the stepped portion, that is, the rotation speed of the mandrel is adjusted to eliminate the difference. When the position difference disappears (hereinafter referred to as position deviation correction control), the uniform speed control is performed mainly with the moving speed of the steel strip in progress and the peripheral speed of the stepped portion, that is, the rotation speed of the mandrel as a slave.

Next, when the front end of the steel strip advances just before the winding start point, the positional deviation detecting means finds the positional difference, and the positional deviation correcting means corrects the positional deviation correcting control. As the position deviation correction means, for example, the steel strip tip is detected by an optical second tip detector S3, the position deviation (between the steel strip tip and the stepped portion) is obtained, and stepped portion position correction information setting is performed. Based on the set value of the container C6, the above-mentioned position deviation correction control is corrected with the correction of the steel strip tip tracking position.

At this time, it is desirable to check and review the accuracy of the calculated value of the tracking tip position between the first tip detector S2 and the second tip detector S3.

Incidentally, regarding the distance between the first tip detector S2 and the second tip detector S3, the mandrel angle is 360 degrees as the positional difference between the steel strip tip position and the stepped portion position of the sleeve in progress. Even in this case, the distance should be long enough to drive in.

Since the tip of the steel strip conforms to the stepped portion in the position-corrected state as described above, it can be sufficiently accommodated with a positional error of about 10 mm or less. The reason is that the detection accuracy of the tip end position of the steel strip is within a few mm as described above, and the position detection accuracy of the stepped portion is a few meters if the angle detector has a resolution of 0.1 degree.
This is because the position detection accuracy of about m is sufficiently satisfied, and the mandrel does not stop temporarily, so that the start timing does not shift.

Further, the tracking position deviation correction control between the front end of the steel strip and the stepped portion is continued for about 3 turns from the state where the winding is started. In reality, it seems that the steel strip tip does not slip from the stepped portion at the completion of almost one turn, but it is desirable to set the continuous range to about three turns in order to increase the accuracy.

As the final positioning accuracy, as described above, the position correction of the steel strip tip is performed at the position of the second tip detector S3, and the accuracy of the steel strip tip tracking position calculation value is improved. If the correction is performed and the correction control of the tracking position deviation between the front end of the steel strip and the stepped portion is continuously performed even after the start of winding, it is within 10 mm.

Although the example using the stepped sleeve has been described here, the cavity 15 as shown in FIG. 3 is used.
It is needless to say that the present invention exerts the same effect even when it is used as a special sleeve with a cover.

[0046]

FIG. 1 is a side view and a block diagram of a steel strip winding device which carries out the method of the present invention, and the same reference numerals are used for the same members as in the conventional example of FIG.

Further, FIG. 2 shows the mounting state of the stepped portion detection sensor used in the present invention, (a) shows the processing state of the stepped portion detection hole, and (b) shows the mounting of the stepped portion detection sensor. Indicates the status.

1 and 2, S2 is the first tip detector of the steel strip 1 in progress, and this first tip detector S
Measuring roll 2 from the time point 2 detects the tip
Outputs a pulse signal proportional to the tip position (by the pulse generator S1) to the steel strip tip position detector C1 to track the tip position. At this time, at the same time, the stepped portion position of the stepped sleeve 7 which has already been mounted on the mandrel 6 which is already rotating is set to the stepped portion detection hole 8 through the stepped portion detection hole 8.
4 and is tracked by the stepped portion position detector C4. The tracking value of the front end position of the steel strip and the position of the stepped portion of the stepped sleeve 7 are matched with each other by the position deviation detector C3 to detect the position deviation.

On the other hand, the tracking value of the front end position of the steel strip is input to the steel strip moving speed detector C2 and differentiated with respect to time to obtain the steel strip moving speed. The steel strip moving speed value is the uniform speed control device C.
5, the peripheral speed command of the stepped sleeve 7 is further sent via the motor control device C7. In this control configuration, the position deviation is input to the uniform speed control device C5 from the position deviation detector C3, but when the position deviation is zero, that is, when both positions match, the steel strip moving speed and the step The peripheral speed of the stepped sleeve 7, that is, the rotational speed of the mandrel is controlled by the uniform speed control device C5 so that the peripheral speeds of the sleeves are uniform and, when the positional deviation has a certain value, the deviation is zero.

In this way, the deviation correction control in the initial stage before the start of winding the steel strip (hereinafter referred to as the initial deviation correction control) is performed. The purpose of this initial deviation correction control is to move the steel strip tip position in progress. And the stepped portion of the stepped sleeve should be controlled so that they almost coincide with each other, that is, pre-preparation before performing highly accurate correction control in the deviation correction control immediately before winding just before the start of winding as shown below. It is to carry out dynamic control.

The stepped portion position correction information setting device indicated by C6 has a function of setting information such as mandrel diameter, sleeve diameter and steel strip thickness necessary for detecting the stepped portion position.

Next, when the steel strip tip in progress moves to the vicinity of the stepped sleeve and the second tip detector S3 detects the tip, the tracking value of the steel strip tip position detector C1 is the second tip detection. Corrected by the physical position of the container S3, accurate position information is obtained. Further, the distance between the first tip detector S2 and the second tip position detector S3 is compared with the tracking value of the steel strip tip position detector C1 to check the accuracy of the tracking calculation value to check the calculation formula. Make a correction.

On the other hand, the stepped portion position tracked by the stepped portion position detector C4 is a highly accurate tracking value obtained at the detection timing of the stepped portion detection hole 8 having a width of about 1 mm. In addition to the embodiment, if a plurality of stepped portion detection sensors S4 are used and one sensor detects a hole every 90 ° rotation, the stepped portion position detector C4 also performs tracking calculation. The value can be checked and the arithmetic expression can be corrected, and the accuracy can be improved.

The positional deviation detector C3 detects the positional deviation between the tracking position of the steel strip tip, which has been corrected in this way to increase the accuracy, and the stepped portion position, and the same control as the initial deviation correction control described above is performed. I do. However, the control at this time is a control for further correcting the deviation remaining in the initial deviation correction control, and is dare to call the deviation correction control immediately before winding. In this deviation correction control immediately before winding, at worst, it is necessary to perform the alignment with an accuracy within 10 mm. However, what finally becomes a problem is the positional deviation at the time when the winding is completed, and it is necessary that the accuracy is within approximately 10 mm at the final time.

Therefore, in order to ensure the required accuracy at the time of completion of the winding, in this embodiment, the positional deviation correction control between the tracking position of the steel strip tip and the stepped portion position is performed up to 3 turns. .

In this embodiment, the tip detectors S2 and S3, the stepped portion detection sensor S4, etc. are of optical type, the operation time is about 1 msec, each equipment is a high-speed sequencer, and the tracking accuracy is very high. Is very good.
The accuracy of the steel strip tip position detection within the deviation correction control immediately before winding is within 2 mm, and the stepped portion position detection accuracy within 5 mm.
It was confirmed that the deviation was within 10 mm. Further, it was confirmed that the final winding was within 10 mm even at the completion of winding.

Table 1 below is a comparison table of the alignment accuracy between the prior art and the present invention, showing the results of the present invention and the estimation accuracy of the prior art.

[0058]

[Table 1]

Further, the steel strip winding device shown in FIG. 1 was installed in a thin steel plate refining line, and two types of low thickness of 1.6 mm × width 914 mm and thickness 2.0 mm × width 914 mm were used. It was applied to the winding of about 20 coils (about 10 tons) of carbon steel strip. As a result, the amount of end marks generated by the conventional method (cardboard insertion, step sleeve) is about 20.
It was confirmed that the average of 0 coils was 50 m, but the average was 6 m or less.

[0060]

As described above, according to the method and apparatus for winding a steel strip of the present invention, the mandrel is made of steel by using the sleeve with the step adjusting portion at the tip of the steel strip such as the stepped portion or the hollow portion. When winding the strip, the tip of the strip and the step adjustment part of the sleeve are aligned with high precision (approximately 10 m).
It is possible to prevent the occurrence of end marks on the steel strip by performing the process within m). Further, the yield of products is improved by greatly reducing the occurrence of this end mark.

[Brief description of drawings]

FIG. 1 is a side view and a block diagram of a steel strip winding device that carries out a method of the present invention.

2A and 2B are a side view and a front view of a stepped sleeve showing a mounting state of a stepped portion detection sensor used in the present invention.

FIG. 3 is a side view of an example of a special sleeve with a hollow portion.

FIG. 4 is a side view showing a conventional example of a steel strip winding device.

FIG. 5 is an explanatory diagram of generation of an end mark.

[Explanation of symbols]

 1 Steel Strip 2 Measuring Roll 3 Pinch Roll 4 Deflector Roll 5 Threading Table 6 Mandrel 7 Stepped Sleeve 8 Stepped Detection Hole 9 Wrapper Roll 10 Belt Trapper 11 Motor 15 Cavity 16 Tip Touch Sensor 17 Touch Roll 18 Tip Touch Detector 19, 20 line S1, S5 pulse generator S2 first tip detector S3 second tip detector S4 stepped portion detection sensor C1 steel strip tip position detector C2 steel strip moving speed detector C3 position deviation detector C4 stepped portion Position detector C5 Uniform speed control device C6 Stepped part position correction information setting device C7 Motor control device

Claims (2)

[Claims] 1. A method of winding a steel strip with a mandrel having a sleeve with a step adjustment portion at the tip of the steel strip, wherein the tip end position and moving speed of the steel strip in progress and the position of the step adjustment portion during rotation are detected. , The rotation angle and speed of the mandrel are controlled so that the position of the step adjuster during rotation matches the position of the steel strip tip in progress, the steel strip tip position is detected again immediately before the start of winding, and the steel strip tip position is detected. The correction control is performed so as to eliminate the position deviation from the step adjustment part position, and further, the correction control of the position deviation between the tracking position of the steel strip tip and the step adjustment part position is continuously performed even after the start of winding. Winding method for steel strip. 2. A steel strip winding device having a mandrel with a sleeve provided with a step adjusting portion at the tip of the steel strip.
Steel strip tip position detecting means, steel strip moving speed detecting means,
Step adjusting portion position detecting means, uniform speed control means for controlling the rotation angle and speed of the mandrel so that the rotating step adjusting portion position matches the tip position of the steel strip in progress, and the tip position of the steel strip and the step Winding of a steel strip, comprising: a positional deviation detecting means for detecting a positional deviation from the position of the adjusting portion; and a positional deviation correcting means for correcting the position of the step adjusting portion so as to eliminate the positional deviation. apparatus.