JP2941552B2 - Diagnosis device for avoiding plate step of coiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for diagnosing the success or failure of avoiding a plate step in an early stage of winding of a coiler for winding a rolled strip.

[0002]

2. Description of the Related Art When winding a strip while pressing the strip against a mandrel by a plurality of unit rollers, in the initial stage of winding, there is a plate step corresponding to the plate thickness at the leading end of the strip. When pressed,
Due to the presence of the plate steps, linear pressing scratches (top marks) occur in the plate width direction of several layers of strips. In order to avoid the generation of the top mark, when a plate step reaches each unit roller, the pressing of the unit roller is temporarily released (hereinafter referred to as tracking), and when the plate step passes, the pressing is restored. That is, a so-called plate step avoidance control is performed.

FIG. 6 is a longitudinal sectional view of a conventional coiler. 6, reference numerals 56, 57, and 58 denote No. 1, No. 2, No.
No. 1 unit roller 5 is a three-unit frame that is rotatably mounted on each bearing block 54.
No. 1, No. 2 unit roller 52, and No. 3 unit roller 53 are respectively axially mounted, and hydraulic cylinders 59 are mounted respectively. The hydraulic cylinder 59 is connected to a coiler control panel (not shown) via a hydraulic device (not shown). 50 is a mandrel, 70 is a pinch roll.

In the configuration shown in FIG. 6, each of the unit rollers 51, 52, 53 is pressed against the mandrel 50 by a hydraulic cylinder 59, and the leading end of the strip S fed through the pinch roll 70 is moved to the mandrel 50. And No.
Winding is started by holding the unit with one unit roller 51.
The first (first layer) winding is performed by each of the unit rollers 51 and 5
2, 53, the pressing is performed on the strip S. Since the above-mentioned top mark is generated by the pressing after the second layer of winding, the unit rollers 51, 5
Tracking for releasing the pressing of the 2, 53 is operated at a predetermined timing per each of the hydraulic cylinder 59, each unit in the strip tip S ₁ roller 51, 52
Are sequentially released to prevent the generation of a top mark due to avoiding a plate step.

[0005]

However, in the conventional apparatus, there is a case where the avoidance of the plate step is failed due to a deviation of the tracking timing or the like. In this case, there is no means for determining the success or failure of avoiding the plate step during the winding of the strip. Can not be distinguished from the top mark. Therefore, the strip coil on which the top mark has been generated is directly sent to a subsequent process, and in this subsequent process, troubles such as a broken plate and a defective product may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a coiler plate step avoidance diagnosis apparatus which diagnoses whether or not a top mark has occurred during coil winding and eliminates troubles in a subsequent process. And

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mandrel, a unit frame rotatably arranged around the mandrel, a unit roller supported by the unit frame, An actuator for rotating the unit frame so that a unit roller is pressed against the mandrel; and a plate step avoiding means for operating the actuator, wherein a stress detector is provided on the unit frame and detects a frame stress. And means for connecting the stress detector and comparing the detected stress with an allowable value to judge whether or not to avoid the plate step difference.

[0008]

When the plate step reaches a predetermined angle when winding the strip, the unit rollers are periodically and sequentially tracked by the actuator and the plate step avoiding means to release the pressing, and the top of the strip is released. Prevent the occurrence of marks. If the unit roller tracking timing is shifted and the plate step is not avoided without releasing the pressing of the plate step, the plate step collides with the unit roller, and the stress of the unit frame caused by the collision is detected by a stress detector. And sends it to the plate step avoidance pass / fail determination means. The plate step avoidance pass / fail determination means performs arithmetic processing on this signal to diagnose the signal, and specifies the coil of the strip on which the top mark has occurred due to failure in plate step avoidance.

[0009]

An embodiment of the present invention will now be described with reference to FIGS. In FIG. 1, the same parts as those in FIG. 6 are denoted by the same reference numerals. 50 is a mandrel, 56, 57, 5
8 is a unit frame that rotates around the mandrel 50, 54 is a bearing block that allows the unit frames 56, 57, and 58 to rotate, and 51, 52, and 53 are rotatably mounted on the unit frames 56, 57, and 58. The unit roller 59 is an actuator.

In the unit frames 56, 57, 58, the stress detectors 1 are provided at locations on the drive side and the work side where the stress values are relatively high. This stress detector 1
Are for detecting the stresses applied to the unit frames 56, 57, 58, respectively. Each stress detector 1 is connected to a band-pass filter 2 as shown in FIG. 2, and this band-pass filter 2 extracts a certain frequency component from the stress waveform from the detector 1. The analog signal input device 3 connected to the band-pass filter 2
It converts an analog waveform into a digital signal.
Thus, the digital stress signal is input to the personal computer 4. Further, a coiler control device 20 is connected to the personal computer 4. The coiler control device 20 specifies and records the input coiler operating conditions and the coil number. Reference numeral 60 denotes a hydraulic unit connected to the coiler control device 20.

FIGS. 3 and 4 mainly show the internal means of the personal computer 4, and include a coil condition storage unit 6, a signal processing parameter storage unit 7, a signal comparison unit 8, which is a central processing unit 5, and a success / failure judgment. It consists of a part 9. The coil condition storage unit 6 stores coil conditions such as the thickness, material, and line speed of the strip S input to the coiler control device 20. The signal processing parameter storage unit 7 stores parameters input and stored in advance. The signal comparing section 8 compares the stress digital signal with a threshold value and / or a reference area value set by the coil condition and the parameter. The success / failure determination unit 9 determines the success or failure of avoiding the plate step based on the comparison operation.

Here, the operation will be described based on the above configuration. Strip S fed by pinch roll 70
Of the tip portion S ₁ is clamped between the mandrel 50 and the No. 1 unit roller 51 to start the winding, the winding in the coil while pressing the strip S by each of the unit rollers 51, 52, 53. The tracking timing of each of the unit rollers 51, 52, 53 for avoiding the plate step is input to the coiler control device 20. When the plate step comes, the hydraulic unit 60 is operated by the signal from the coiler control device 20. Thus, the unit rollers 51, 52, 53 are sequentially operated to avoid a step, thereby preventing the generation of a top mark.

Even when the tracking step is not performed and a plate step portion arrives, any one of the unit rollers 51, 5
When the strips 2 and 53 press the strip S as it is, the plate step collides with the unit rollers 51, 52 and 53, and
A top mark is generated on the strip S. Stress detector 1
Measures and changes the stress value due to the collision, transmits a certain frequency component from the waveform signal by the band pass filter 2, converts the frequency component into a digital signal by the analog signal input device 3, and transmits the digital signal to the personal computer 4. This waveform signal can be easily measured by the stress detector 1 even if the strip S is thin and the plate step is small. The personal computer 4 stores the signal, the reference value input to the signal processing parameter storage unit 7 and the coil conditions such as the coil number, plate thickness, material, and line speed input from the coiler controller 20 to the coil condition storage unit 6. , And a comparison operation is performed by the signal comparing unit 8, and the success / failure determining unit 9 makes a determination. Then, the determination result is transmitted to the coiler control device 20 to be recorded, and is transmitted to the control device (not shown) in the next step.

The processing flow by the personal computer will be described. When comparing the stress value input to the personal computer with the reference value, if the thickness of the strip is large, the dimension of the plate step is large and if avoiding the plate step fails, the stress value acting on the unit frame also increases. The stress value acting on the unit frame when pulling up the unit roller to avoid the plate step difference is smaller than the stress value due to the collision caused by the failure of the plate step difference and the unit roller to avoid the plate step difference. Therefore, it is possible to determine the success or failure of avoiding the step difference depending on whether the waveform of the stress value is taken out and its amplitude is within or exceeds an allowable amplitude set value (referred to as a threshold value) as a reference value.

When the thickness of the strip is small,
Since the size of the plate step is also small, the stress value acting on the unit frame when failing to avoid the plate step is small, and the threshold value is set small. In this case, the stress value in the normal plate step avoidance state may exceed the threshold value,
It is difficult to judge the success or failure only by the amplitude. Therefore, the allowable value of the sum of the areas of the waveforms where the amplitude exceeds the threshold value is set, and the sum of the area of the portion where the measured stress value exceeds the threshold value is compared with the reference value which is the set value. Then, the success or failure of the plate step avoidance is determined.

If the thickness of the strip is intermediate, the stress value is compared with both the amplitude and the sum of the waveform areas to determine the success or failure of the plate step. When the strength and / or the line speed of the strip is large, the stress value acting on the unit frame due to the collision between the plate step portion and the unit roller increases, so that the threshold value is determined according to the strength and / or the line speed. Set large,
The determination method may be changed from comparison of amplitude to comparison of amplitude and waveform area, or comparison of only waveform area sum.

FIG. 5 shows a flow chart for judging the threshold value and the reference area value based on the process of judging the success or failure of avoiding the plate step. Steps A, B and C are from the input of the stress value signal to the digital conversion. Is executed, and it is determined in step D whether or not the data collection is completed. If completed, the process returns to step E, and if not completed, steps A, B and C are repeated. In step E, coil condition input processing is performed, and in step F
It is determined whether or not to perform the threshold determination. When performing the threshold determination, steps G, H, I, J, and K are performed. Here, N indicates the frame number, and a comparison operation between the stress value and the threshold value is performed for all frames.

If the threshold value is not determined in step F, or if the threshold value determination is completed in step K, it is determined in step L whether or not the reference area value determination is to be performed. Step R when the reference area value determination is not performed
To step M, N, O,
P and Q are executed. Here, N also indicates the frame number. In this way, at least one or both of the threshold value and the reference area value are compared and determined, and the success or failure of avoiding the plate step is determined and output in step R (step S).

[0019]

As described above, in the apparatus for diagnosing plate-step differences of a coiler according to the present invention, the frame stress detector mounted on the unit frame supporting the unit rollers and the unit frame stress detecting means are provided. It is possible to detect the failure of avoiding the plate step due to the change in the distortion of the coil, and easily identify the top layer in the coil without any special inspection or coil rewinding. be able to. Therefore, by removing the top mark generating portion of the coil before sending it to the subsequent process, it is possible to prevent troubles such as plate breakage and product failure in the subsequent process. Further, this device is small and simple, and can be easily installed in an existing coiler.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a coiler according to an embodiment of the present invention.

FIG. 2 is a simplified block diagram of a board level difference avoiding diagnosis device.

FIG. 3 is a detailed block diagram of FIG. 2;

FIG. 4 is a more detailed block diagram of FIG. 3;

FIG. 5 is a flowchart showing a procedure for determining the success or failure of avoiding a plate step.

FIG. 6 is a longitudinal sectional view of an example of a conventional coiler.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stress detector 2 bandpass filter 3 analog signal input device 4 personal computer 5 CPU 6 coil condition storage unit 7 signal processing parameter storage unit 8 signal comparison unit 9 success / failure determination unit 20 coiler control device 50 mandrel 51, 52, 53 unit Roller 56, 57, 58 Unit frame

──────────────────────────────────────────────────続 き Continuing on the front page (72) Hirofumi Yoshikawa 4-22, Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Akira Kaya, 4-chome Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima No. 6-22 Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Fumio Fukushima 4-2-2 Kanon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Hiroshi Sugimasa Kure-shi, Hiroshima 11-1, Showa-cho, Nisshin Steel Co., Ltd.Kure Works (72) Inventor Takahashi Baba 11-1, Showa-cho, Kure-shi, Hiroshima Prefecture Nisshin Steel Co., Ltd.Kure Works (56) References JP3 −297514 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21C 47/06 B21C 51/00 B65H 23/195

Claims (1)

(57) [Claims] 1. A mandrel, a unit frame rotatably disposed around the mandrel, a unit roller supported by the unit frame, and the unit frame so that the unit roller is pressed by the mandrel. An actuator having a rotating actuator and a plate step avoiding means for operating the actuator, comprising: a stress detector provided on the unit frame to detect a frame stress; and a stress connected to the stress detector and detected. Means for determining whether or not to avoid the step difference by comparing with an allowable value.