JP2693499B2 - Rolling equipment - Google Patents

Description

Description: [Industrial field of use] The present invention relates to rolling equipment in which the strip crown on the delivery side of a rolling mill is kept constant.

[Prior Art] In the conventional rolling equipment, a strip crown detector is provided on the exit side of the rolling mill, and based on the strip crown detected by the strip crown detector, the strip crown amount to be corrected by the upstream rolling mill is determined. Seeking,
According to the amount of the plate crown, the bending of each rolling mill is operated to control the plate crown of the material to be rolled.

However, in the conventional rolling equipment, it is impossible to correct the plate crown until the material tip reaches the plate crown detector on the delivery side of the most downstream side rolling mill, so-called feedback control of the plate crown, so the yield is reduced. .

[Problems to be Solved by the Invention] In the conventional rolling equipment, since the work roll bending device is operated based on the signal from the plate crown detector on the delivery side of the rolling mill, the correction of the plate crown is delayed due to the response delay, There is a problem that the yield is reduced.

[Means for Solving the Problem] The present invention is directed to at least one rolling mill, a plate crown detector and a plate length detector provided on the rolling mill entrance side, and a plate detected by the plate crown detector. The work roll bending force of the work roll bending device of the rolling mill is obtained from the target plate crown of the material for the material output side of the rolling mill, and the work roll bending force is output based on the data sent from the plate length detector. An arithmetic and control unit is provided for obtaining timing and giving a command to the work roll bending apparatus in accordance with the timing.

[Operation] In the present invention, the strip crown detector detects the strip crown on the rolling mill entrance side, and the work roll bending force for making the strip crown on the rolling mill exit side the target strip crown is determined from the strip crown. Work roll bending control is performed, the timing at which a predetermined part of the plate is introduced into the rolling mill is determined from the data detected by the plate length detector, and the work roll bending force is adjusted according to the timing. It is output to the bending device. Therefore, the plate crown on the delivery side of the rolling mill is in a desired state, and the yield is improved.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention.
2, 3 are No. 1, No. 2, No. 3 rolling mills arranged in series from the upstream side to the downstream side in the feeding direction of material 4, and 5 is provided in No. 1 rolling mill 1. Work roll bending device, 6 is a bending force detector for detecting the work roll bending force P _B1 of the work roll bending device 5, and 7 is N
o.1 Load detector that detects rolling force P _R1 of rolling mill 1, 8 is N
o.1 A plate crown detector arranged on the upstream side of the rolling mill 1,
9 is a plate length detector which is arranged on the upstream side of the plate crown detector 8 so that a pulse can be transmitted in accordance with the rotation, and 10 is No. 1
A setter 11 for the target plate crown C _r1 of the material 4 on the delivery side of the rolling mill 1, and 11 is an arithmetic and control unit.

The arithmetic and control unit 11 performs a predetermined arithmetic operation based on the target plate crown C _r1 on the exit side of the No. 1 rolling mill 1 set by the setter 10 and various data detected by each detector, and the work roll bending unit 5 The corrected work roll bending force ΔP _B1 to be given is determined, and at the time when the portion of the material 4 detected by the plate crown detector 8 is introduced into the No. 1 rolling mill 1 by the signal from the plate length detector 9, the A signal of the corrected work roll bending force ΔP _B1 can be given to the work roll bending device 5 at the same time, and it has a built-in counter and memory.

Details of the plate crown detector 8 are shown in FIG.
The X-ray transmitter 13 is an X-ray receiver, and 14 is a carriage on which the X-ray transmitter 12 and the X-ray receiver 13 are mounted so as to be movable in the width direction of the material 4.

At the time of rolling, the plate crown target value C _r1 of the material 4 on the outgoing side of the No. 1 rolling mill 1 is set in the arithmetic control unit 11, and the material of the material 4 on the incoming side of the No. 1 rolling mill 1 is set according to the rolling schedule.
The plate thickness, the plate width, the plate crown, etc. are input, and thus the arithmetic and control unit 11 determines the work roll bending force P _B0 from the difference between the target plate crown C _r1 and the reference plate crown according to the rolling schedule. A command is given to the work roll bending device 5, and the operation is started.

When the material 4 passes the plate length detector 9, the plate length detector 9 rotates and a pulse signal is given to the arithmetic and control unit 11,
It is counted by the counter. In this case, if the material 4 advances by ΔL in one pulse, the material 4 is nΔL in n pulses.
Will only proceed.

Further, the plate crown detector 8 detects the plate thickness t _{1 at} the central portion of the material 4 and the plate thicknesses t ₂ and t ₂ ′ at both ends, and the signals are given to the arithmetic and control unit 11, and in the arithmetic and control unit 11, the rolling is performed. The plate crown C _{r0 on the} machine 1 entry side is Required by.

In the No. 1 rolling mill 1, the rolling force P _R1 detected by the load detector 7 is given to the arithmetic and control unit 11, and based on the above formula (i) and the following formulas (ii) and (iii), the material 4 The work roll bending force P _{B0 of the} No. 1 rolling mill 1 is obtained such that the plate crown of No. 1 becomes the target plate crown C _r1, and the work roll bending force P _B0 thus obtained and the bending force detector 6 detect the work roll bending force P _B0. The difference ΔP _B1 between the work roll bending forces P _B1 sent to the arithmetic and control unit 11 is given as a corrected work roll bending force from the arithmetic and control unit 11 to the work roll bending unit 5, and the work roll bending force is added or subtracted by ΔP _B1. To be done. This gives N
o.1 The plate crown of the material 4 on the delivery side of the rolling mill 1 is controlled to be the target plate crown C _r1 .

 Where the formula is:

C ₁ = α ₁₁ P _R1 −α ₁₂ P _B0 −α ₁₃ C _W1 + γ ₁ …… (iii) In addition, H ₀ ; No. 1 rolling mill 1 entry side plate thickness H ₁ ; No. 1 rolling mill 1 exit side plate thickness ζ ₁ ; No.1 Transfer rate of rolling mill 1 η ₁ ; No.1 Heritability of rolling mill 1 C ₁ ; No.1 Mechanical crown amount of rolling mill α ₁₁ , α ₁₂ , α ₁₃ ; No. 1 rolling Influence coefficient of mill 1 C _W1 ; No. 1 work roll crown of rolling mill β ₁ , γ ₁ ; correction term Corrected work roll bending Δ from operation control unit 11
The timing for outputting P _B1 is obtained as follows. That is, the distance from the strip length detector 9 to the center of the strip crown detector 8 is L ₁ , and the strip crown detector 8 to the No. 1 rolling mill 1
Assuming that the distance to the center is L ₂ and the amount of movement of the material 4 per pulse of the plate length detector 9 is ΔL, the portion of the material 4 that reaches the plate length detector 9 is transferred to the plate crown detector 8. The number of pulses to reach The number of pulses from the plate crown detector 8 to the center of No. 1 rolling mill 1 is Therefore, after passing the plate length detector 9, If the command of ΔP _B1 is given to the work roll bending device 5 when the number of pulses is counted, accurate plate crown correction is performed. In other words, ΔP _B1 calculated based on the data detected before the count
Should be output.

FIG. 3 shows another embodiment of the present invention. In the case where the material 4 is significantly distorted when the final plate crown of the material 4 is rolled by only the No. 1 rolling mill 1 to a desired state. ,
This is an example in which the No. 2 rolling mill 2 is also subjected to strip crown correction.

In FIG. 3, 5'is a work roll bending device provided on the No. 2 rolling mill 2, 6'is a bending force detector for detecting the work roll bending force P _B2 'of the work roll bending device 5', and 7'is A load detector for detecting the rolling force P _R2 of the No. 2 rolling mill 2, 9'is a plate length detector capable of transmitting a pulse in accordance with rotation, and 10 'is at the exit side of the No. 2 rolling mill 2. It is a setter of the target plate crown C _r2 of the material 4, and the same parts as those shown in FIG. 1 are given the same reference numerals.

The control in the No. 1 rolling mill 1 has already been described, but the control in the No. 2 rolling mill 2 is performed as follows. That is, No.2 rolling mill 2
From, the rolling force P _R2 detected by the load detector 7 ′ is given to the arithmetic and control unit 11, and in the arithmetic and control unit 11, (i)
The work roll bending force P of the No. 2 rolling mill 2 is adjusted so that the plate crown of the material 4 becomes the target plate crown C _r2 set by the setter 10 ′ based on the formula and the following formulas (iv) and (v).
_B0 ′ is obtained, and the work roll bending force P _B0 ′ and the work roll bending force P _B2 ′ which are detected by the bending force detector 6 ′ and sent to the arithmetic and control unit 11 are obtained.
It is given by the difference [Delta] P _B2 fixes the work roll bending force as an arithmetic control device 11 of the work roll bending apparatus 5 ', the work roll bending force is added or subtracted [Delta] P _B2. As a result, the plate crown of the material 4 on the delivery side of the No. 2 rolling mill 2 is controlled so as to reach the target plate crown C _r2 .

 Where the formula is:

C ₂ = α ₂₁ PR ₂ −α ₂₂ P _{B 2} −α ₂₃ C _{W 2} + γ ₂ (v) In addition, H ₂ ; No. 2 rolling mill 2 exit side plate thickness ζ ₂ ; No. 2 rolling mill 2 transfer rate η ₂ ; No.2 Heritability of rolling mill 2 C ₂ ; No. 2 Mechanical crown amount of rolling mill 2 α ₂₁ , α ₂₂ , α ₂₃ ; Influence coefficient of No. 2 rolling mill C _W2 ; No. 2 rolling Machine roll crowns β ₂ and γ _{2 of} machine 2; Correction terms Corrected work roll bending Δ from arithmetic and control unit 11
The timing for outputting P _B2 is determined as follows. That is, if the distance from the plate length detector 9 ′ to the center of the No. 2 rolling mill 2 is L ₃ and the amount of movement of the material 4 per pulse of the plate length detector 9 ′ is ΔL ′, the material 4 The number of pulses required to reach the center of the No. 2 rolling mill 2 from the part that reached the strip length detector 9 ' Therefore, if the command of ΔP _B2 is given to the work roll bending device 5 ′ when the L ₃ / ΔL pulse is counted after passing the plate length detector 9 ′, even at the No. 2 rolling mill 2 output side. Accurate plate crown correction is done. In other words, it is sufficient to output ΔP _B1 obtained based on the data detected before the count of L ₃ / ΔL ′ from the present time.

In the embodiment of the present invention, the plate crown is corrected by one or two rolling mills, but the rolling crown can be corrected by any number of rolling mills. Of course, various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] According to the rolling equipment of the present invention, when a predetermined portion of the material is introduced into the rolling mill, the work roll bending force device is operated by the corrected work roll bending force corresponding to that portion to plate the plate. Since the crown is corrected, feedforward control is possible, more accurate and constant strip crown can be obtained compared to feedback control, yield is improved, and the length provided on the inlet side of the rolling mill is improved. The distance detector can accurately measure the distance to the work roll, and the correct work roll bending force according to the plate crown can be applied at the correct timing. As a result, more accurate plate crown control can be performed. Various excellent effects can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the rolling equipment of the present invention, FIG. 2 is a detailed view of a plate crown detector used in the rolling equipment of FIG. 1, and FIG. 3 is another rolling equipment of the present invention. It is explanatory drawing of an Example. In the figure, 1, 2 and 3 are No. 1, No. 2 and No. 3 rolling mills, 4 are materials, 5 and 5'are work roll bending devices, 6 and 6'are bending force detectors, and 7 and 7 ' Is a load detector, 8 is a plate crown detector, 9 and 9'are plate length detectors, 10 and 10 'are setting devices, and 11 is an arithmetic and control unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroaki Kuwano, 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima-Harima Heavy Industries Co., Ltd. Yokohama Second Factory (72) Tatsuya Yamada, Kamikatakamaki, Moka-shi, Tochigi Prefecture 344-2 (72) Inventor Eisuke Mikuni 3216-3 Taimachi, Moka City, Tochigi Prefecture 3216-3 (72) Takayuki Fujimoto 8 No. 8 Otanidai Town, Moka City, Tochigi Prefecture (56) Reference JP-A-51-32466 (JP, A) ) JP-A-58-16720 (JP, A) JP-B-50-8029 (JP, B1)

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. At least one rolling mill, a strip crown detector and a strip length detector provided on the rolling mill entrance side, a strip crown detected by the strip crown detector, and a rolling mill exit side material. The work roll bending force of the rolling mill work roll bending device is calculated from the target plate crown, and the work roll bending force is output based on the data sent from the plate length detector. A rolling facility comprising an arithmetic and control unit for giving a command to the work roll bending unit.