JP3395873B2 - Coarse cut control device in strip steel rolling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coarse division cutting control device for cutting a rolling material to be fed to a cooling floor into a predetermined coarse division length by a division shear in a strip rolling mill comprising a continuous mill. The present invention relates to a control device for controlling a crop shear so that a final material after cutting has a predetermined rough division length.

[0002]

2. Description of the Related Art Conventionally, the following two types of coarse division cut control methods are known. (1) The material (final material) after the final rough division cutting in the dividing shear after the final stand is cut by the chopping shear and is not sent to the cooling bed, and this material is not made into a product. (2) The final material is also sent to the cooling floor to be a product.

[0003]

In the above method (1), the length of the material sent to the cooling bed does not vary so much, but a chopping shear is required in the dividing shear line to cut the final material. Therefore, there is a problem that the rolling equipment becomes large and complicated, and the equipment cost increases. Also,
In the method of (2), although the chopping shear is not necessary, the length of the final material on the cooling floor varies, and the yield is deteriorated when the final material is further divided and commercialized thereafter. There is.

Therefore, the present invention solves these problems,
An object of the present invention is to provide a rough division cut control device for a strip rolling mill, which is capable of cutting the final material into a predetermined length without increasing the size of the rolling mill.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 cuts a rolling material moving in a steel strip rolling facility consisting of a continuous mill into a predetermined rough dividing length by a dividing shear. In the coarse division cut control device,
Feed length detection means to detect the feed length of the rolled material from the stand arranged on the upstream side of the crop shear as the number of pulses, and rough division cut by the division shear downstream from the final stand arranged on the downstream side of the crop shear The rolling material length after the final rough division cut is determined by using the means for reading the number of pulses for each rough division cut, the pulse number for each rough division cut, and the set value and the current value of the number of rough division cuts by the division shear. The number of pulses detected by the feed length detection unit is equal to the number of trailing cut pulses, and the number of trailing cut pulses (the number of crop shear cut pulses) is calculated so that the rough division length becomes At times, a cut command is issued to the crop shear. According to the present invention, the length of the final material can be maintained at a roughly divided length without providing a chopping shear on the dividing shear line.

Further, in the invention according to claim 2, in the coarse division cut control device according to claim 1, the number of tip cutting pulses corresponding to the crop shear tip cutting length of the rolled material is calculated for calculating the number of trailing end cutting pulses. It is used further.
According to the present invention, the length of the final material can be optimized even when the tip of the rolled material is cut.

Further, in the invention according to claim 3, in the coarse division cut control device according to claim 1 or 2, the final number of rolled materials on the cooling bed arranged downstream of the division shear is set to the number of the trailing end cut pulses. A new number of trailing end cut pulses is obtained by adding the number of correction pulses according to the length of the material. According to the present invention, the length of the final material can be adjusted with higher accuracy.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment, in which a rolled material 10 is sent to a cooling floor 17 through the stands 11, 12, and 13 in the bar rolling equipment in order. A crop shear 14 is arranged between the stand 11 and the stand 12, and the final stand 13 and the cooling floor 17 are arranged.
A dividing shear 16 is arranged between the two. Further, a material detection sensor 18 is attached between the stand 11 and the crop shear 14, and a chopping shear 15 is arranged on the exit side of the crop shear 14. The chopping shear 15 may be omitted.

Reference numeral 19 is a rolling roll driving motor for the stand 11, and a pulse generator 20 for detecting the number of revolutions is attached to the motor 19. The output signal of the pulse generator 20 is input to the pulse counter 21, and the zero preset signal from the material detection sensor 18 is also input to the pulse counter 21.

The output signal of the pulse counter 21 is inputted to the register 22 and the comparator 24, and the register 22 is also inputted with the coarse division cut detection signal by the division shear 16. Here, the motor 19, the pulse generator 20 and the pulse counter 21 constitute a feed length detecting means for detecting the feed length of the rolled material 10 from the stand 11 as the number of pulses.

The count value of the pulse counter 21, which is the output signal of the register 22, is input to the calculator 23, which calculates the number of pulses P or (P + ΔP) using various data as will be described later. ) Is output.
These pulse numbers P or (P + ΔP) are input to the comparator 24, and when the count value output from the pulse counter 21 matches P or (P + ΔP), the rolled material 1
A cut command for 0 is sent to the crop shear 14.

Next, in this embodiment, the rolled material 1
The operation will be described including the case where the tip cut of 0 is also performed. After passing through the stand 11, the rolled material 10 has its tip cut by the crop shear 14 to
2, ……… The final stand 13 is rolled, and the split shear 16 allows it to fit on the cooling floor 17 several times.
It is roughly divided and cut. During this period, a series of control from the leading edge cutting to the trailing edge cutting by the crop shear 14 is performed as follows.

(1) When the tip of the rolled material 10 is detected by the material detection sensor 18 on the exit side of the stand 11, a zero preset signal is sent to the pulse counter 21 at the rising of the detection signal, and the pulse count value is zero preset. To do.

(2) A predetermined tip cut length, a distance between the material detection sensor 18 and the crop shear 14, a time from the activation command of the crop shear 14 to the actual cutting operation (cropping shear activation time) ), The tip cut pulse number P _top is calculated and generated, and the pulse number P _top is sent from the calculator 23 to the comparator 24. In the comparator 24, when the count value of the pulse counter 21 becomes equal to the pulse number P _top , a cut command is sent to the crop shear 14 to cut the leading end of the rolled material 10.

(3) Next, the rolled material 10 is applied to each stand 1
It is sent to the cooling floor 17 through 1 to 13 and divided shear 16
Each time the rough division cut is performed by, the count value of the pulse counter 21 is stored in the register 22 using the coarse division cut detection signal from the division shear 16. Here, the count value (pulse number) at the time of the first rough division cut is set to P ₁ , 2
The second count value is P ₂ , ..., The mth count value is P
_{Let m} .

(4) The number of pulses corresponding to the rear end of the (n + 1) th final material on the cooling floor 17 (rear end cut pulse), where n is the set value of the rough division cut number and m is the current value. Number) P, including Crop Shear startup time,
Calculate with.

[0017]

## EQU1 ## P = {(n + 1) (P _m -P ₁ ) / (m-1)} + P _top

In this equation 1, (P _m -P ₁ ) / (m-
The term 1) means the number of pulses corresponding to the average value of one coarse division length by the division shear 16, and the number of pulses (n + 1) indicating the number of the final material is multiplied by this number of pulses to obtain the tip. By adding the cut pulse number P _top , the rear end cut pulse number P of the final material is obtained.

(5) Then, the number of trailing end cut pulses P
Is sent to the comparator 24, and when the count value of the pulse counter 21 becomes equal to the trailing end cutting pulse number P, a cutting command is sent to the crop shear 14 to cut the trailing end of the rolled material 10.

The above corresponds to the embodiments of the invention described in claims 1 and 2, and theoretically, the length of the final material can be made substantially equal to the rough division length L. However, in reality, a slight error may occur in the length of the final material due to an error in the diameter of the rolling roll or a change in the tension of the rolled material 10.

Therefore, in the embodiment of the present invention as defined in claim 3, the length of the final material is corrected by correcting the trailing end cut pulse number P according to the length ΔL (mm) of the final material on the cooling floor 17. The distance is set as close as possible to the coarse division length L. That is, the correction pulse number ΔP with respect to the rear end cut pulse number P is calculated by the following mathematical expression 2.

[0022]

## EQU2 ## ΔP = {(P _m -P ₁ ) / (m-1)} × (ΔL / L)

This correction pulse number ΔP is added to the trailing end cut pulse number P according to Formula 1 to obtain (P + ΔP), which is the comparator 24.
When the count value of the pulse counter 21 becomes equal to the new trailing end cutting pulse number (P + ΔP), a cutting command is sent to the crop shear 14 to cut the trailing end of the rolled material 10. This makes it possible to bring the length of the final material closer to the rough division length L.

[0024]

As described above, according to the present invention, it is possible to make the length of the final material almost a rough division length without providing a chopping shear in the dividing shear line. Therefore, it is possible to simplify the rolling equipment, reduce the equipment cost, and improve the product yield. In the tests conducted by the inventors, the variation in the length of the final material on the cooling floor is 1 with respect to the coarse division length.
It has been confirmed that it can be suppressed within (m).

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

10 Rolled material 11, 12, 13 stand 14 Cropshire 15 Chopping shears 16 division shear 17 Cooling floor 18 Material detection sensor 19 motor 20 pulse generator 20 21 pulse counter 22 registers 23 arithmetic unit 24 comparator

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideyuki Nishida Inventor Hideyuki Nishida 1-1 No. 1 Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Fuji Electric Co., Ltd. (72) Masafumi Kitani No. 1 Nitta Tanabe, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 within Fuji Electric Co., Ltd. (56) Reference JP-A-63-30120 (JP, A) JP-A-57-149021 (JP, A) JP-A-3-198904 (JP, A) JP-A-2- 89516 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 37/00-37/78 B21B 1/00-1/46 B21B 15/00

Claims (3)

(57) [Claims] 1. A coarse division cutting control device for cutting a rolling material moving in a strip rolling mill consisting of a continuous mill to a predetermined coarse division length by a division shear, from a stand arranged upstream of a crop shear. A feed length detecting means for detecting the feed length of the rolled material as a pulse number, a means for reading out the pulse number for each rough division cut by a dividing shear downstream from the final stand arranged on the downstream side of the crop shear, Using the number of pulses for each divided cut, the set value of the number of coarse divided cuts by the divided shear, and the current value, the trailing edge cut pulse is applied so that the rolled material length after the final coarse divided cut becomes a predetermined coarse divided length. The number of pulses detected by the feed length detecting means is equal to the number of trailing end cut pulses. And wherein the generating the cut command to shear, coarsely divided cut control apparatus in long products rolling equipment. 2. The coarse-division cut control device according to claim 1, further comprising using a tip cut pulse number corresponding to a crop shear tip cut length of the rolled material in the calculation of the trailing end cut pulse number. , Coarse-division cut control device in strip rolling equipment. 3. The rough division cutting control device according to claim 1, wherein the number of trailing end cut pulses is corrected according to the length of the final material of the rolled material on the cooling bed arranged downstream of the division shear. A rough division cut control device for a strip rolling mill, wherein a new number of trailing end cut pulses is added to the number of pulses.