JPS60234715A - Device for controlling rolling mill - Google Patents

Abstract

PURPOSE:To stabilize a continuous rolling control by detecting actual rolling time of travelling rolling material and by calculating a deviation with the set value of changeover timing also by correcting in order the rolling reduction of each stand. CONSTITUTION:A detector 16 is arranged among each stand No.1-4 and the front and rear ends of a rolling material 2 are detected. A pass time detecting circuit 14 detects an actual rolling time from each output signal of the detector 16 and accepts the set value of a timing setting device 9 for switching speed reference and detects the deviation in timing. The detected value thereof is then inputted into arithmetic circuit 13 for correcting rolling reduction. The arithmetic circuit 13 calculates the rolling reduction of a rolling roll 1 corresponding to each timing deviation, corrects the rolling reduction given in advance and rolls the material 2 with changing the roll gaps. By this method unstable factors based on the front and rear end controlling are removed and a stabilized continuous rolling control is enabled.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rolling mill control device, and particularly to a rolling mill control device for controlling the rolling amount of a continuous rolling stand and performing material edge treatment by detecting the actual rolling time. The present invention relates to a suitable rolling mill control device.

[Technical background of the invention]

Such a rolling mill control device is applied to a general continuous rolling stand control device, and will be explained below using a tube material rolling mill as an example.

In a tube rolling mill, a stomach phenomenon in which the tip and rear ends of the tube bulge relative to the center usually occurs during the rolling process. In response to this phenomenon, conventional rolling mill control devices perform front end control and rear end control in order to remove this bulge and obtain a constant diameter of the pipe material.

FIG. 1 is a schematic diagram of a conventional rolling mill control device used for rolling pipe materials. As shown in the figure, each stand +1.
At 42 and 43, the rolling material 2 is continuously rolled by the rolling roll 1 provided with a rolling blade by the rolling roll rolling motor 5. The rolling roll 1 is driven by an electric motor 3 to feed the rolled material 2, and the feeding speed in this case is controlled by a speed control device 6. Each stand $1. +2. As the speed reference for the speed control device 6 where ≠3, each set value by the speed reference setting device 8 and the speed reference switching timing setting device 9 is given via the speed reference calculation circuit 7. On the other hand, the rotational speed of the electric motor 30 detected by the rotary generator 4 is fed back to the speed control device 6 . the result,
The speed control device 6 controls the electric motor 3 connected to the rolling roll 1 to a speed standard given by the speed standard calculation circuit 7,
Rolling material 2 is rolled at a predetermined speed. On the other hand, the rolling blades of the rolling roll drive motors 5 each having a stunner of 1.42°+3 are controlled by the rolling-down control device 10. In this case, the rolling-down reference is the set value of the rolling-down reference setting device 12. given through. As a result, the rolling down control device IO drives the rolling roll rolling motor 5 and sets the gap between the rolling rolls 1 for each rolling material 2.

Note that the detector ■5 is located on the upstream side of the stand≠1 and detects the rolled material 2.
The detection signal is sent to the speed reference switching timing setter 9.

In this configuration, its operation will be explained with reference to the rolling state explanatory diagrams of FIGS. 2 to 8 and the time chart of FIG. 9. By the way, in Figure 9, T-F1 to T-F3
is each stuntna 1. ≠2. ≠3, which is the rotational speed of the rolling roll 1 before the start of rolling, that is, before time t1, as is clear from the figure, each stand +1. +2. +3 is rotating faster than the adjacent upstream stand.

Now, after the start of rolling, that is, after time t1, the tip of the rolled material 2 is bitten into the stand +2 as shown in Fig. 2, and the stand +1 is accelerated to the rotation speed W2. N1. Tension is applied to the tip of the rolled material 2 due to the difference in roll circumferential speed between ≠2. Similarly, after time t2, as shown in FIG. 3, with the tip of the rolled material 2 biting into the stand≠3, the stunter 1. +2 are both accelerated to the rotation speed W3, but at this time, stander 2.
Tension is applied to the rolled material 2 due to the difference in peripheral speed of the rolls between +3 and 3. Similarly, as shown in FIG. 4, after time t3 when the tip of the rolled material 2 is bitten into the stand 4-4, the stand +1. +2.43 are both accelerated to the rotation speed type π4, and tension is applied between the stands 43 and 44.

As described above, in the conventional rolling mill control device, the speed of the upstream stand is sequentially accelerated every time the adjacent downstream stand bites the tip of the rolled material 2, and the bulge at the tip of the rolled material 2 is removed. There is. The timing at which the downstream stand bites the rolled material 2 is determined by the speed reference switching timing setter 9 before the start of rolling based on the passing timing of the rolled material 2, which is an output signal from the detector 15.

Each stand≠1. +2. The speed reference acceleration rate (3) is common to each stand, and the amount of the acceleration reference value based on this is calculated by the speed reference calculation circuit 7. This acceleration reference value is +1 for each stand. +2.43 is given to the speed control device 6, and as a result, the tip control is performed in a speed pattern as shown in the time chart of FIG.

All stands $1.12. After completing +3 tip control,
The center portion of the rolled material 2 is rolled at a steady rolling speed, and then rear end control is performed. As shown in FIG. 5, when the detector 15 detects passage of the rear end of the rolled material 2 at time t6, the stand +1 is decelerated to the rotational speed BIF1.

As a result, Standner 1. Due to the difference in roll peripheral speed between ≠2, tension is applied to the rear end of the rolled material 2. Next, the sixth
As shown in the figure, after time t7 when the rear end of the rolled material 2 passes through the stand≠1, the stuntner 2 is rotated at a rotation speed of BBJ13F.
Decrease the speed to 2 and stand ÷ 2. Tension is applied to the rear end of the rolled material 2 due to the difference in peripheral speed between the rolls 3. Similarly, the seventh
As shown in the figure, after time t8 when the rear end of the rolled material 2 passes through the stand +2, the stunter 3 is decelerated to the rotational speed BIF 3 and the stand +2. Tension is applied to the rear end of the rolled material due to the peripheral speed difference between ≠3.

As mentioned above, in the conventional rolling mill control device,
Each time the rear end of the rolled material 2 passes through an adjacent upstream stand,
Decrease the speed of the own stand and move the rear end of the rolled material 2 (
Removes glare. Note that the timing at which the rolled material 2 passes through each stand is given by the speed reference switching timing setter 9 based on the passing timing of the rolled material 2, which is an output signal of the detector 15, similarly to the tip control. As a result, rear end control is performed according to the speed pattern shown in the time chart of FIG. In addition, each stand + 1°na 2
．． When the rolling material 2 has completely passed through its own stand, the speed is changed to the number of revolutions 'I'RBF 1 to TEE? for rolling the next material in sequence at times t and ~t1□. Change the setting to 3.

[Problems with background technology]

In the rolling mill control device as described above, the switching timing of the speed reference is set by the speed reference switching timing setting device 9 based on the output of the detector 15, which is based on the feed rate of the rolled material 2. Since the operator must make predictions and settings based on such conditions, error-free settings are required in accordance with the rolling schedule. Furthermore, each rolling stunter 1. 2. There is a high possibility that there will be a discrepancy between the machine specification settings and the actual rolling results due to slips between the rolling stock 3 and the rolling material 2, and there is a limit to accurate leading edge control and trailing edge control.

[Purpose of the invention]

Therefore, an object of the present invention is to solve the above problems of the prior art, detect the actual rolling time of the traveling rolling material, calculate the deviation from the switching timing setting value, and calculate the reduction amount of each stand based on the result. It is an object of the present invention to provide a rolling mill control device that makes it possible to perform sequential correction and perform accurate leading edge control and trailing edge control of a rolled material.

[Summary of the invention]

In order to achieve the above object, the present invention provides a speed standard setting means for providing a speed standard to a plurality of rolling stands that perform continuous rolling, and a speed change amount for accelerating and decelerating each time a rolled material passes through each stand. speed reference setting means for setting the switching timing between the set speed reference and the amount of speed change; and speed control means for controlling the rolling speed of each stand based on the output of the speed reference switching timing setting means. , a reduction amount/type setting means for setting the gap between the rolling rolls corresponding to the material to be rolled, and a reduction control device for controlling the distance between the rolls of each stand based on the output of the reduction reference setting means to control the reduction amount of each stand. means, a detection means for detecting the passage of the rolled material between each stand, a material passing real time detection means for detecting the stand passage time of the rolled material based on the output of the detection means, and switching timing of the speed reference switching timing setting means. The present invention provides a rolling mill control device comprising a reduction correction means for correcting the amount of reduction of each stand by the reduction control means based on the output of the material passage real time detection means.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1θ is a schematic configuration diagram of a rolling mill control device according to an embodiment of the present invention. In the figure, a detector 16 is connected to each stander 1. ≠2.43.44, and detects the leading and trailing ends of the rolled material 2. The passage time extraction circuit 14 takes in each output signal of the detector 16 and the set value of the speed reference switching timing setter 9, detects a timing deviation, and inputs this to the reduction correction amount calculation circuit 13. The reduction correction percentage calculation circuit 13 calculates the amount of reduction of each rolling roll l corresponding to each timing deviation, corrects the amount of reduction given in advance, and adjusts the amount of rolling material 2 while changing the roll gap of each rolling roll 1. Carry out rolling. In addition, other speed standards,
The amount of speed change, reduction standard, etc. are given in the same manner as in the conventional rolling mill control device shown in FIG.

In such a configuration, the operation is next shown in FIGS. 11 and 12.
The explanation will be given according to the rolling state diagram in the figure.

First stage, from detector 15 in front of stand +-1 to stand Φ
The distance between 1/. , stunter 1 to detector 16
Let the distance to /'tt be. These distances ERt10°I! 1□ is the distance that can be recognized from the equipment configuration, and each stander 1. ≠2. ≠ Distance '1*'2 between 3 and distance l between stands +-2, +3 and each detector 16! 1
The same can be said for □l'21112□, etc.

On the other hand, the switching timing of the speed reference is determined by the speed reference switching timing setting device 9 such that the arrival time of the rolled material 2 to the stand +1 is tso, each stand +1, +2. The passing time for ≠3 is set as t8□+tB□. During the actual rolling process, the transit time detection circuit 14 detects the transit time of the rolled material 2 through each stand +1, +2, and S3 in the following manner. Now, as shown in Fig. 11, the rolled material 2
Assume that the tip of the detector 5 passes through the detector 5 in front of the stand +1, and then reaches the detector 16 after the stand +1.

At this time, the actual measured time of passage of the rolled material 2 between both detectors 15 and 16 tv'o and each stand +1. ÷ Distance between 2 l!
From L+'ll, the arrival time ts of the rolled material 2 to the stunter 1.

It is possible to judge the rationality of Incidentally, the arrival time tvo of the rolled material 2 to the stand -4=1 can be determined through calculation performed by the rolled material passage time detection circuit 14. Here, Ko is a deceleration coefficient during rolling. Next, the difference between the set value set in the speed reference switching timing setter 9 and the actual measurement time is calculated using the following equation (2).

tso −tvo ”Δ1o,,“−(2) Here, △
If t0>0, the roll interval for stand≠1 is in the opening direction, △
If to is 0, the roll interval is corrected in the closing direction. The correction amount in this case can be determined by the reduction correction amount calculation circuit 13 using the following equation.

ΔB□MonK·Δto (3) However, K is a rolling plate conversion constant. The reduction correction amount Δ8 determined here
1 is compared with the set value Syu by the reduction standard setter 12, and the reduction standard? Through the jtx circuit 11, the pressure reduction control device lO
The amount of reduction of the stuntner 1 is corrected by 8S1 in the opening or closing direction.

Next, as shown in FIG. 12, the tip of the rolled material 2 is placed on the stand-! Assume that the light passes through P2 and reaches the detector 16.

In this case, the distance between stands +-1 and +2 is 11, and the distance between detector ■6 after stand ≠ 1 and stand 4 = 2 is "12".
, machine layout data of stand≠2 and distance 12□ of detector 16 after stand 42, and both detectors 16 when material passes
Actual passing time between 1v + □ and stand + of rolled material 2
The rationality of the arrival time tE3+ to 2 is determined. The actual time of arrival of the rolled material 2 to the stand≠2 determined by the calculation performed by the material passing time detection circuit 14 and the passing set time tS1 set in the speed reference switching timing setting device 9
First, Δ11 is calculated from the difference between . Furthermore, this difference △t
1, the reduction correction amount calculation circuit 13 calculates the reduction correction amount △S2.
, and match it with the reduction standard setting value S2 of stand +2.

Next, the reduction amount of the stand +2 is corrected by ΔS2 in the opening or closing direction using the reduction control device [10].

The reduction force correction as described above was applied to each stand by $1°2. By carrying out step 3, it is possible to execute the tip control for removing the bulge at the tip of the rolled material 2. Further, it goes without saying that the rear end control for removing the bulge at the rear end of the rolled material 2 is also performed by the turning section in the same manner in the configuration of this embodiment.

In the above embodiment, the amount of reduction in the stand that corrects the reduction force is corrected using the detector immediately after the stand, but it is also possible to correct the amount of reduction in the downstream stand at any time. Accurate reduction amount correction can be performed.

As described above, by detecting the actual running time of the rolled material 2 and correcting the operating rake setting error and the slippage between the rolling roll and the material that occurs during rolling, it is possible to It is possible to perform end-hikigyo.

Although the above explanation has been given as an example of tube rolling, the present invention can also be applied to other continuous rolling equipment, and similar effects can be obtained with C and R.

〔Effect of the invention〕

As described above, according to the present invention, unstable factors related to control of the leading and trailing ends of rolled materials, such as discrepancies with setting data due to slips of rolled materials and setting errors by operators, are eliminated, and stable continuity is achieved. A rolling mill control device capable of controlling rolling can be obtained.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional rolling mill control device;
1, 5, 6, 7, and 8 are illustrations of rolling states for explaining the tip control in the configuration shown in FIG. 1. FIG. 9 is a time chart showing the speed pattern of the leading end control and trailing end control in the configuration of FIG. 1, and FIG. A schematic cross-section diagram of the rolling mill control device, FIGS. 11 and 12 are preliminary rolling state explanatory diagrams for explaining the operation of the configuration shown in FIG. 1θ. DESCRIPTION OF SYMBOLS 1... Rolling roll, 2... Rolling material, 3... Electric tank, 5... Rolling roll reduction motor, 6... Speed side f
II drum direct, 9...speed reference switching timing setter,
lO... Rolling down control device, 13... Rolling down correction amount calculation circuit, 14... Passing time detection circuit, 15. ．． 16...
Detector. Applicant's agent Kiyoshi Inomata b 1 Illustration 2 Figure 53 Figure 4 Sen 65 Figure 66 Figure 67 Figure 68 Enmo 9 Figure W 10 Figure 611 Figure 812 Figure

Claims (2)

[Claims] (1) A speed standard calculation means that provides a speed standard to a plurality of rolling stands that perform continuous rolling, a speed standard calculation means that generates a speed change amount to accelerate or decelerate each time the rolling material passes through each stand, and settings. A speed reference switching timing setting means for setting the switching timing of the speed reference and the speed change amount, a speed control means for controlling the rolling speed of each stand based on the output of the speed difference rate switching timing setting means, and a speed control means for controlling the rolling speed of each stand based on the output of the speed difference rate switching timing setting means, A rolling reference setting means for setting the gap between the rolling rolls; a rolling reduction control means for controlling the roll interval of each stand based on the output of the rolling reference setting means to control the rolling amount of each stand; a detection means for detecting passage of the material, a material passage real time detection means for detecting the stand passage time of the rolled material based on the output of the detection means, a switching timing of the speed reference switching timing setting means and an output of the material passage real time detection means. A rolling mill control device comprising: a rolling reduction correction means for correcting the rolling reduction amount of each stand by the rolling reduction control means based on the rolling mill control device. (2) The rolling mill according to claim 1, wherein the speed reference switching timing setting means predicts and sets the switching timing based on the distance between the plurality of rolling stands and the set speed of the rolling material. Control device.