JPH0565285B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for controlling the tail end cutting of a coil shear line, and is particularly suitable for application to a coil shear line in which the distance between a payoff reel and a sheet cutting shear is long, and is suitable for continuously cutting a coiled strip. While unwinding the strip, the sheet cutting shear is used to cut the unwound strip into sheets of the set sheet length.
The present invention relates to an improvement in a method for controlling the cutting of the tail end of a coil shear line in which the coil shear line is divided into parts and cut by a tail end cutting shear provided on the line entry side.

[Conventional technology]

Generally speaking, in a coil shear line where a strip wound into a coil is continuously unwound and cut into sheets of a set sheet length using a sheet cutting shear, the entire original coil is cut into sheets. In some cases, the original coil is cut into parts in the middle, and the remaining parts are not cut into sheets.
Among these methods, the latter method includes a method in which, after the final cut is made with the sheet cutting shear, the entire unwound strip up to just before the sheet cutting shear is wound around the original coil; 1977
As disclosed in No. 83883, a tail end cutting shear is provided on the line entry side separately from the sheet cutting shear, and the tail end cutting shear cuts the rewound strip into parts in the middle thereof, There is a method in which all the strips on the downstream side are cut into sheets by a sheet cutting shear, and only the strip up to just before the tail end cutting shear is wound around the original coil. In particular, when the distance between the payoff reel for setting the original coil and the sheet cutting shear is relatively long, the latter is often adopted. The present invention
The present invention relates to a tail end cutting control method suitable for such cases. Conventionally, when controlling the tail end cutting in such a case, as shown in FIG.
Pinch roll 1 for sending 0 to the looper 18
6, a measuring roll 20 for detecting the feed length of the strip 10 in order to cut the strip 10 to a set sheet length, and
0 to the sheet cutting shear 24; a sheet conveyor 26 for conveying the sheet 11 cut by the sheet cutting shear 24; and a sheet conveyor 26 for conveying the sheet 11 cut by the sheet cutting shear 24;
In the coil shear line having a piler 28 for piling the sheet, the sheet cutting shear 24
A desired number of sheets 11 are cut at the same time, and the strips 10 are cut into sheets according to the length of the strip 10 existing between the sheet cutting shear 24 and the tail end cutting shear 14 provided immediately after the payoff reel 12. Considering the number of strips to be cut, the operator issues a strip stop command ST to the pinch roll 16, stops the pinch roll 16 disposed on the exit side of the tail end cutting shear 14, and unwinds the coil of the payoff reel 12. After stopping, the operator gives the tail end cutting command TC to the tail end cutting shear 14, and the tail end cutting shear 1
4 is driven to cut the strip 10 into parts, and the strip on the downstream side is then passed through the feeder roll 2.
2, the sheet is fed to the sheet cutting shear 24 and cut into sheets. On the other hand, the strip upstream of the tail end cutting shear 14 was wound onto the payoff reel 12. Sheet cutting by said sheet cutting shear 24 is carried out without stopping the strip, during which time
In order to be able to stop the strip at the payoff reel 12 or tail end cutting shear 14, the looper 18 and the pinch roll 16 for feeding the strip 10 to the looper 18 are necessary.
When the strip is stopped when cutting the sheet, or when the strip at the cut part of the sheet can also be stopped when cutting the tail end, the pinch roll 1 is used.
6 and the looper 18 can be omitted, and there are also products of this type.

[Problems to be solved by the invention]

In any case, in the conventional method, the length of the final sheet cut by the sheet cutting shear 24 was cut regardless of the set sheet length, so that the tail end of the cut strip was When arriving at the sheet cutting shear 24, the length of the last sheet cut there will often be significantly different from the desired sheet length. Therefore, particularly when the set sheet length is long, the yield is significantly reduced. The present invention has been made to solve the above-mentioned conventional problems, and the length of the final sheet cut by the sheet cutting shear can be minimized. It is an object of the present invention to provide a method for controlling the cutting of the tail end of a coil shear line, which can improve the yield without causing any problems.

[Means to solve the problem]

In the present invention, a strip wound into a coil is continuously unwound and cut into a sheet of a set sheet length by a sheet cutting shear, and the unwound strip is cut into a sheet with a set sheet length in the middle of the process. In a method for controlling the tail end cutting of a coil shear line in which division is performed by a tail end cutting shear provided at In order to reliably ensure the following when dividing the sheet by the tail end cutting shear, the length of the strip existing between the tail end cutting shear and the sheet cutting shear is determined by determining the margin length according to the range of variation in the stop timing. When stopping the strip at the tail end cutting shear point, the remainder is calculated by subtracting an integer multiple of the set sheet length from the sum of the distances the strip advances from when the stop command signal is output until the strip actually stops. is the remaining fraction length, and the sum of the distance between the sheet cutting shear and the feeder roll immediately before it and the margin length is the final sheet target length, and a starting signal for the tail end cutting shear is given. Sometimes, if the remaining fractional length at this point is less than the final sheet target length, the strip length is calculated by subtracting the remaining fractional length at this point from the final sheet target length. is rewound, and at the timing when the insufficient length is obtained, the strip is stopped at the tail end cutting shear portion to perform division cutting by the tail end cutting shear, while the start signal of the tail end cutting shear is activated. If the remaining fractional length at this given point is longer than the final sheet target length, the shortfall obtained by subtracting the remaining fractional length at this point from the sum of the set sheet length and the final sheet target length. The above purpose is achieved by unwinding the strip in order to obtain the length, and at the timing when the insufficient length is obtained, stopping the strip at the tail end cutting shear portion and performing division cutting by the tail end cutting shear. This has been achieved.

[Effect]

If we are only concerned with increasing yield, a strip that is unwound from a coil and cut into sections by a tail-cutting shear can be cut to a set sheet length up to the final sheet at its tail end. It is desirable to cut. However, it is difficult to accurately cut the last sheet to the desired length. This is due to the error in measuring the length A of the strip 10 that exists between the tail end cutting shear 14 and the sheet cutting shear 24, and the difference between such strip length A and the set sheet length after cutting. This is because there are calculation errors when calculating the number of sheets obtained by division, and deviations in cutting timing at the tail end cutting shear 14. The present invention has been made with this point in mind. For this reason, in the present invention, even if there is a shift in the cutting timing at the tail end cutting shear 14, there is no problem in conveyance between the sheet cutting shear 24 and the feeder roll 22 immediately before it.
Special consideration is given. That is, as mentioned above, since there are variations in the cutting timing etc. of the tail end cutting shear 14, it is necessary to find the necessary minimum length of the final sheet that does not interfere with conveyance etc., and to ensure this. Then, I try to find the final sheet length. That is, the final sheet is cut to the desired final sheet length. Therefore, in the present invention, the final sheet target length is determined as follows. That is, first, even if the stop timing of the strip 10 at the tail end cutting shear 14 varies, the final sheet target length is reliably ensured when the tail end cutting shear 14 cuts the strip into parts. A margin length is determined according to the range of variation in the stop timing. Further, when the margin length is determined in this way, the final sheet target length is determined as the sum of the distance between the sheet cutting shear 24 and the feeder roll immediately before it and the margin length. That's what I do. In addition to finding such a final sheet target length, in the present invention, the remaining fractional length is also found. In determining the remaining fractional length, first, the length A of the strip is determined. For example, when a tail end cutting activation signal for operating the tail end cutting shear 14 is given, the length A of the strip is determined at this timing. this is,
For example, a tail end cutting start signal that operates the tail end cutting shear 14 and a sheet cutting timing signal of the sheet cutting shear 10, which are generated when a desired number of sheets is obtained during sheet cutting work, are used. You can also ask for Furthermore, in the present invention, the amount B by which the strip moves from when the stop command signal is output to when the strip actually stops is also determined. Furthermore, the remainder of the integer quotient of the calculation result of (A+B)/SL to determine the number of sheets Y (Y is an integer) of the predetermined sheet length SL to be cut by the sheet cutting shear 24 is calculated as the remaining fraction length. I try to look for it as it is. Therefore, the remaining fractional length determined in this way takes into consideration the delay in stopping the strip at the tail end cutting shear 14. In this way, when the remaining fractional length and the final sheet target length are determined, the tail end cutting is performed based on the length relationship and the difference between the remaining fractional length and the final sheet target length. After the activation signal for the shear 14 is given, the timing at which the strip is further rewound is determined. That is, when the activation signal for the tail end cutting shear 14 is given, if the remaining fractional length at this point is shorter than the final sheet target length,
In order to obtain an insufficient length by subtracting the remaining fractional length at this point from the final sheet target length, the strip is rewound, and at the timing when the insufficient length is obtained, the strip is cut at the tail end cutting shear 14 portion. is stopped, and division cutting by the tail end cutting shear 14 is performed. That is, when the tail end cutting shear 14 performs division cutting, the length of the final sheet after the division cutting follows the final sheet target length. On the other hand, if the remaining fractional length at the time when the activation signal for the tail end cutting shear 14 is given is longer than the final sheet target length, from the sum of the set sheet length and the final sheet target length, In order to obtain the insufficient length by subtracting the remaining fractional length at this point, the strip is rewound, and at the timing when the insufficient length is obtained, the strip is stopped at the tail end cutting shear 14 portion and the tail end is cut off. Cutting shear 14
Executes split cutting by . That is, when the remaining fractional length is longer than the final sheet target length, after the start signal of the tail end cutting shear 14 is given, first one sheet of the set sheet length is cut. After unwinding the strip to obtain the final sheet length, further unwinding the strip to obtain the final sheet target length;
At the timing when the final sheet target length is obtained,
The tail end cutting shear 14 performs divisional cutting. Therefore, in the present invention, even if the remaining fractional length is shorter than the final sheet target length, or even if it is longer than the final sheet target length, the resulting final sheet length, that is, the tail end The length of the final sheet after stopping the strip at the cutting shear 14 and performing the division cutting by the tail cutting shear 14 is:
This is in accordance with the final sheet target length. At this time, the final sheet target length includes the sheet cutting shear 24 and the feeder roll 22 immediately before it.
Since the above-mentioned margin length is added to the length of the distance between the tail end cutting shear 1
Even if a timing shift occurs in the tail end division cutting at step 4, the length of the final sheet will be equal to or longer than the distance between the sheet cutting shear 24 and the feeder roll 22 just before it. , it is possible to divide and cut more reliably. As described above, according to the present invention, the sheet cutting shear can be cut without impairing the conveying performance of the strip and without causing any hindrance to the cutting of the final sheet by the sheet cutting shear disposed after the tail end cutting shear. The length of the final sheet to be cut can be minimized, and the yield of strips can therefore be improved. As described above, the length of the final sheet in the present invention is a predetermined margin length depending on the distance between the sheet cutting shear and the feeder roll immediately before it and the timing shift of dividing and cutting at the tail end cutting shear. It does not depend on the set sheet length of each sheet that is gradually cut by the sheet cutting shear. Therefore, even if the set sheet length becomes longer, the final sheet target length and the final sheet length according to the present invention are constant, so the final sheet length will not become longer. , the yield improvement effect becomes even more remarkable.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a tail end cutting control device employing a coil shear line tail end cutting control method according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, this embodiment includes a payoff reel 12, a tail end cutting shear 14, a pinch roll 16, a looper 18, a measuring roll 20, and a feeder roll 22, which are similar to the conventional example.
In the coil shear line having a sheet cutting shear 24, a sheet conveying conveyor 26, and a piler 28, the strip 1
a length measurement controller 30 for determining the feed length of 0;
According to the feed length signal output from the length measurement controller 30, the sheet cutting timing signal SC input from the sheet cutting shear 24, the set sheet length signal SL input from the outside, and the tail end cutting shear activation signal TS. Then, at the tail end cutting timing determined according to the present invention, a strip stop command signal ST is output to the pinch roll 16, and a tail end cutting command signal TC is outputted to the tail end cutting shear 14 to cut the tail end. an arithmetic and control unit 32 that enables the execution of
. The effects of the embodiment will be explained below. In the line configuration shown in FIG.
The loop amount is electrically controlled to be constant. Further, sheet cutting is separately controlled by a measuring roll 20, a feeder roll 22, and a sheet cutting shear 24 so as to be performed at a set sheet length SL. This set sheet length signal SL is also given to the arithmetic and control unit 32,
The arithmetic and control unit 32 determines the strip length A between the tail end cutting shear 14 and the sheet cutting shear 24;
When stopping the strip at the tail end cutting shear point 14, the number of sheets Y + y = the amount B of the strip from when the stop command signal ST is output until the strip actually stops using the following formula.
Calculate (A+B)/SL in advance. Here, SL×
y is called the remaining fraction length. On the other hand, as shown in FIG.
4, the cutting length of the final sheet at the tail end cannot be reduced to less than the distance C between the sheet cutting shear 24 and the feeder roll 22. Then,
The final sheet must be at least C in length. In the end, the final sheet length can only be cut to a length between C and SL+C. Therefore, in this embodiment, the final sheet length is cut at a value as close to C as possible and larger than C. This value is called the final sheet target length D. In reality, the word difference in the strip length A, the calculation error in the number of sheets Y+y, the tail end cutting shear 14
There is a difference in cutting timing, etc. Therefore, the target sheet length D of the final sheet is the value obtained by adding a predetermined margin length to the arrangement interval between the feeder roll 22 and the sheet cutting shear 24, that is, the above-mentioned calculation error, cutting timing deviation, etc. The value shall be the addition of the margin length according to. In this embodiment, this margin length is a value obtained by adding 1/2 of the standard deviation 3〓 of the variation on one side. In addition, in this embodiment, the length of the strip is X′=w
-y (w = target sheet length D of final sheet / set sheet length; w is usually less than 1), and when x'< 0, x' = 1 + w - y. Take control. By performing such control, it is possible to always cut the final sheet to the minimum necessary length, and the yield can be improved without impairing the conveyance of the strip. Specifically, in this embodiment, the remaining fraction length
Using SL×y and the final sheet target length D, the value P given by the following equation is set as the tail end cutting control setting value (number of pulses). When D<SL×y, P=K(SL+D-SL×y)...(1) When D≥SL×y, P=K(D-SL+y)...(2) Here, K is the distance. This is a pulse conversion coefficient for converting to the number of pulses. Therefore, at the point when the desired number of sheets is expected to be obtained, the activation signal TS of the tail end cutting shear 14 is activated.
is given to the arithmetic and control device 32 from the outside, the cutting timing signal SC of the sheet cutting shear 24 immediately after this is given as a starting point, and the measuring roll 20
Counting of the strip feed length pulse signal PL input through the length measurement controller 30 is started from
When this count number Q matches the set value P, a stop command signal ST to stop the strip at the tail end cutting shear 14 is sent to the pinch roll 1.
6 and when the strip stops, a tail end cutting command signal TC is sent to the tail end cutting shear 14.
is given. Thereafter, the strip downstream from the tail end cutting shear 14 is cut into the next sheet cutting shear 24.
If the final sheet is cut at approximately the target length D, the final sheet will be cut at approximately the target length D. By the way, for example, when cutting work with a set sheet length of 2000 mm, the average value of the final sheet length was 1600 mm with the conventional method, but when the present invention is implemented, the average value is reduced to 600 mm. The effect can be 1/2 (1600−600)
mm×Plate width×Plate thickness×(Product unit price - Scrap unit price)×
This is particularly effective when cutting long sheets, since the number of operations required is reduced. Also, for example, setting sheet length SL = 600 to 8000mm
(Average 2000mm), target length of final sheet D = 1100mm
If this example is applied to a coil shear line where 2100−1100)×
It is possible to improve by the width of the board x the thickness of the board x the number of times x the difference in unit price. In the above embodiment, the measuring roll 20 and the feeder roll 22 were separate bodies, but by integrating them, the measuring roll 20 and the feeder roll 22 were separated.
It is also possible to omit 0.

【Effect of the invention】

As explained above, according to the present invention, the length of the final sheet to be cut by the sheet cutting shear can be minimized, and therefore, the yield can be improved without impairing the conveyability of the strip. It has the excellent effect of being able to

[Brief explanation of the drawing]

Figure 1 is a front view showing the configuration of a coil shear line in which a conventional tail end cutting control method is adopted;
The figure is a front view, including a partial block diagram, showing the configuration of an embodiment of a coil shear line tail end cutting control device in which the tail end cutting control method according to the present invention is adopted. 10... Strip, A... Strip length, 11
...Sheet, 12...Payoff reel, 14...Tail end cutting shear, TC...Tail end cutting command signal, 16...Pinch roll, ST...Slip stop command signal, 20...
Measuring roll, 22...Feeder roll, 2
4...Sheet cutting shear, 30...Length measurement controller, 32
...Arithmetic control unit, SL...Setting sheet length, D...Final sheet target length.

Claims (1)

[Scope of Claims] 1. While continuously unwinding the coiled strip, it is cut into sheets of a set sheet length by a sheet cutting shear, and the unwound strip is In a method for controlling the tail end cutting of a coil shear line in which the tail end cutting shear provided at the line entry side performs divisional cutting, the final sheet described below may be In order to ensure that the target length is ensured during division cutting by the tail end cutting shear, an allowance length is determined according to the range of variation in the stop timing, and an allowance length that exists between the tail end cutting shear and the sheet cutting shear is determined. When stopping the strip at the tail end cutting shear point, calculate an integral multiple of the set sheet length from the sum of the length of the strip and the amount the strip moves from when the stop command signal is output to when the strip actually stops. The remainder is set as the remaining fractional length, and the sum of the distance between the sheet cutting shear and the feeder roll immediately before it and the margin length is set as the final sheet target length, and the start signal of the tail end cutting shear is set as the final sheet target length. When given, if the remaining fractional length at this point is shorter than the final sheet target length, obtain the insufficient length by subtracting the remaining fractional length at this point from the final sheet target length. Rewind the strip to
At the timing when the insufficient length is obtained, the strip at the tail end cutting shear section is stopped and division cutting is performed by the tail end cutting shear. If the remaining fractional length at the current point is longer than the final sheet target length, subtract the remaining fractional length at this point from the sum of the set sheet length and the final sheet target length to obtain the insufficient length. , the tail of a coil shear line is characterized in that the strip is rewound and the strip is stopped at the tail end cutting shear portion at the timing when the insufficient length is obtained, and division cutting is performed by the tail end cutting shear. Edge cutting control method.