CN104772337A - Method for controlling torque loop quantity of hot continuous rolling mill - Google Patents
Method for controlling torque loop quantity of hot continuous rolling mill Download PDFInfo
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- CN104772337A CN104772337A CN201410010245.2A CN201410010245A CN104772337A CN 104772337 A CN104772337 A CN 104772337A CN 201410010245 A CN201410010245 A CN 201410010245A CN 104772337 A CN104772337 A CN 104772337A
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- kink
- angle
- loop
- moment
- rolling mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a method for controlling the torque loop quantity of a hot continuous rolling mill. The method comprises the following steps: loop torque obtained after threading is stabilized is detected; a current angle of a loop is detected; a steady angle of the loop is controlled; the loop quantity of a current rack is calculated; the steady loop quantity of a rack is controlled; per unit treatment is adopted to obtain a triadic relation of the loop quantity, the torque and the loop angle; and the optimum working angle of the loop is determined. Control over the loop angle in the rolling process of a hot continuous rolling mill set is combined, and through physical characteristics of different kinds of strip steel, calculation of loop transmission torque is combined, so that the optimum threading loop angle is obtained; and the relation among loop quantity fluctuation, loop angle fluctuation and the transmission torque difference condition is combined, so that stable control over the loop is achieved. According to the method, locating control over the loop angle after strip steel threading is effectively achieved, and in the production process, the loop angle fluctuates within a certain range, so that the fixed angle locating control with the relatively-high stability is obtained.
Description
Technical field
The present invention relates to a kind of automation of rolling control method, specifically about the loop control method in a kind of continuous hot-rolling mill production process.
Background technology
In continuous hot-rolling mill production process, the tower-loop control of band steel in the normal operation of rolling, directly has influence on the stable of the operation of rolling.Due in the operation of rolling of reality, for different kink angles, there is certain difference in its stability controlled, there is larger fluctuation in the cover amount being mainly reflected in loop length fluctuation its reality in certain scope, simultaneously, because kink transmits the difference of moment in control procedure, fluctuating widely of its kink angle can be caused equally.
Due to the instability of band steel in crossing process, when kink is built, kink angle reaches 38.15 degree, final kink angle reaches 46.29 degree, the existence that the Torque Control of kink is therebetween same is stablized scarcely, and be continued above 500ms, thus cause tower-loop control abnormal, heap steel accident can be produced time serious.In addition, after tower-loop control drops into, kink angle is too small, but cover amount between its frame is comparatively large, thus causes tower-loop control abnormal, makes strip steel head drawing down, until break.
The prior art situation that relevant hot continuous rolling mill loop controls is as follows: be in " control device of tandem mill " No. 00814067.7 patent application in denomination of invention, disclose a kind of control device of tandem mill, it is applicable to make drive kink eyelid retractor of rotating to contact with the material to be rolled by milling train motor feed drive by kink eyelid retractor motor thus to carrying shape to limit, and have in the tandem mill be rolled continuously at the same time and accept torque instruction thus the kink eyelid retractor torque controller of direct torque carried out to above-mentioned kink eyelid retractor motor and accepts mill speed instruction thus above-mentioned milling train motor carried out to the mill speed controller of speeds control, also there is kink eyelid retractor angle controller and kink eyelid retractor speed control, this kink eyelid retractor angle controller implements control algorithm to the deviation of the kink eyelid retractor angle command that kink eyelid retractor angle inputs with outside and the angular deviation of kink eyelid retractor, and operation result is supplied to the rolling speed control as mill speed instruction, this kink eyelid retractor speed control is with the arithmetic speed action faster than this kink eyelid retractor angle controller, control algorithm is carried out to the deviation of kink eyelid retractor speed and outside kink eyelid retractor speed command input and kink eyelid retractor velocity deviation, the torque instruction that operation result has nothing to do as the output with above-mentioned kink eyelid retractor angle controller is supplied to above-mentioned kink eyelid retractor torque controller.This patent application relates to a kind of kink eyelid retractor angle controller and implements control algorithm to the deviation of the kink eyelid retractor angle command that kink eyelid retractor angle inputs with outside and the angular deviation of kink eyelid retractor, and operation result is supplied to the rolling speed control as mill speed instruction.
Be relate generally to controlling looping of finishing mill and system in No. 03135885.3 patent application of " milling train loop control method and system " in denomination of invention, in particular to the technology controlled finishing mill kink, a kind of controlling looping of finishing mill is provided, comprise tension link and Voltage loop controls, outer amplitude limit using tension signal as voltage signal, then to limit every after signal carry out Current adjustment, in order to control loop motor.This application for a patent for invention also provides a kind of finishing mill looper control system, can in kink soft landing, namely kink is when conforming to a conventional pattern, when loop back roll is about to fall roll line mechanical zero, produce the impact to base hardly, its Main Function is the impact reduced kink plant equipment and control panel, increases the service life.And the soft contact of kink rise cover contact zones steel time, to band steel drift hit less, tension force can not be produced and uprush, be conducive to controlling strip steel head and width.This patent application relates to provides a kind of controlling looping of finishing mill, comprises tension link and Voltage loop controls, the outer amplitude limit using tension signal as voltage signal, then to limit every after signal carry out Current adjustment, in order to control loop motor.
Be relate generally in the CN200710061425.3 patent application of " a kind of method solving difficulty of looping tail at steel rolling production-line " to solve difficulty of looping tail problem in denomination of invention, adopt the payload header of milling train, tail signal as tower-loop control signal, play the payload header signal of cover order from downstream milling train, conform to a conventional pattern the load tail signal of order from upstream milling train, and three loopers load signal of first milling train being introduced directly into first, second and third adjacent rolling mill of downstream are as control signal; Successively the load signal of all the other upstream milling trains is introduced directly into looper between second and third adjacent rolling mill of downstream as control signal; The rolled piece afterbody sent with upstream milling train controls without the trailing edge signal of steel signal the time that downstream looper shifts to an earlier date one ~ tri-rolling mill simultaneously starts the action that conforms to a conventional pattern.Owing to just sending the order that conforms to a conventional pattern when steel tail does not also depart from upstream stand, after kink falls, steel tail just departs from upstream stand, thus efficiently solves whipping problem.
At the loop control method that denomination of invention is when relating to a kind of strip steel threading between frames movable sleeve in the CN200610028695.X patent application of " loop control method during strip steel threading between frames movable sleeve ", comprise the following steps: loop back roll is in initial angle; When band steel enters forebay, kink enters preparation angle; When strip steel head sucks forebay, crossed loop back roll position, loop back roll enters threading angle; When strip steel head enters afer bay, kink plays cover, ensures that loop back roll Up Highway UHW is lower than the actual rolling minimum rate of accumulation; Play cover to terminate, kink conforms to a conventional pattern, and enters ready position.Wherein, loop back roll initial angle is by angle generator automatic Calibration.Apply loop control method during this strip steel threading between frames movable sleeve, need not the artificial fixed position of looper initial angle control, control method achieves automatic ration control and automatic dynamic control, effectively avoid the scratch on the bottom surface defect with steel existence between finishing stand, strip steel head to fold and steel scrap.Loop control method when this patent application is strip steel threading between frames movable sleeve, relates generally to the Angle ambiguity of loop back roll in threading.
In sum, although above-mentioned four patent applications of prior art all relate to the problem of hot tandem tower-loop control, all do not relate to the kink positioning control after band steel threading.
For this reason, be necessary to find one in process of production kink angle fluctuate in certain limit, and its stability relatively high determine angle&orientation control method.
Summary of the invention
The object of this invention is to provide a kind of control method of continuous hot-rolling mill moment cover amount, kink angle&orientation control after effective solution band steel threading, kink angle is in process of production fluctuated in certain limit, and can obtain its stability relatively high determine angle&orientation control.
The control method of a kind of continuous hot-rolling mill moment cover amount of the present invention, comprises the following steps:
Threading stablize after the detection of kink moment;
Kink current angular detects;
The steady Angle ambiguity of kink;
When forebay cover gauge is calculated;
The control of the steady cover amount of frame;
Adopt standardization process, obtain the triadic relation of cover amount, moment, kink angle;
Determine kink best effort angle.
In the detecting step of the kink moment after threading is stablized, when object tape steel tensional fixation, kink moment is the function of kink angle, wherein kink dead-load moment and compensating torque are all determined by working curve, kink dead-load moment and compensating torque, are obtained by kink pressure-measuring head;
In the step of the steady Angle ambiguity of kink, according to function curve and the mild Region control principle of its kink moment and kink angle under different moment, kink operating angle is made to select in the milder region of curve;
When forebay cover gauge calculate step be according to following formulae discovery:
Wherein:
Δ L is for working as protheca amount, unit mm;
The length of L1 kink fulcrum when between forebay to frame, unit mm;
L2 kink fulcrum to the length of kink work centre point, unit mm;
L3 kink work centre point to the length of next frame, unit mm;
Length between L frame, unit mm;
The current machine frame loop level angle of cos α;
Next machine frame loop level angle of cos β;
In the step of the steady control of cover amount of frame: according to corresponding relation curve and the steady principle of loop length and kink angle, make loop length select in the less state of angle equally; Described kink angle is the kink current angular measured by kink current angular detecting step;
In standardization treatment step, the triadic relation according to obtained cover amount, moment, kink angle asks gradient, then carries out standardization process, to obtain cover amount gradient and setting moment gradients two gradient curves;
Determining in kink best effort angle steps, be in conjunction with above-mentioned standardization result, obtain the intersection point of two gradient curves, and using this crosspoint as kink best effort angle;
The invention has the beneficial effects as follows: the present invention program in conjunction with hot tandem in the operation of rolling for kink Angle ambiguity time, by the physical characteristic of different steel, in conjunction with the calculating of kink driving torque, to obtain best threading kink angle; In conjunction with the relation under loop length fluctuation, kink angle fluctuation and transmission moment difference condition, achieve the stability contorting of kink.
Accompanying drawing explanation
Fig. 1 is the kink schematic diagram of the control method of the continuous hot-rolling mill moment cover amount of one embodiment of the invention;
Fig. 2 is the kink moment of control method and the graph of relation of kink angle of the continuous hot-rolling mill moment cover amount of one embodiment of the invention;
Fig. 3 be the control method of the continuous hot-rolling mill moment cover amount of one embodiment of the invention frame between the graph of relation of cover amount and kink angle;
Fig. 4 is the gradient curve figure of cover amount, moment and the kink angular relationship that the employing standardization process of the control method of the continuous hot-rolling mill moment cover amount of one embodiment of the invention obtains;
Fig. 5 is the flow chart of the control method of the continuous hot-rolling mill moment cover amount of one embodiment of the invention.
Detailed description of the invention
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.First it should be noted that, the present invention is not limited to following detailed description of the invention, and the spirit that those skilled in the art should embody from following embodiment is to understand the present invention, and each technical term can do the most wide in range understanding based on Spirit Essence of the present invention.In figure, same or analogous component uses the same reference numerals to represent.
Existing composition graphs 1 to Fig. 5 illustrates the control method of a kind of continuous hot-rolling mill moment cover amount of the present invention.The control method of continuous hot-rolling mill moment cover amount of the present invention comprises the following steps:
P1: threading stablize after the detection of kink moment: because the composition of kink moment is when object tape steel tensional fixation, part is all the function of kink angle in fact, and wherein kink dead-load moment and compensating torque are all determined by working curve, wherein, for kink dead-load moment and compensating torque, obtained by kink pressure-measuring head.
P2: kink current angular detects: detect in conjunction with kink angle, current kink angle is detected, as shown in Figure 3.
P3: the steady Angle ambiguity of kink:
The curve of its kink moment and kink angle under different moment, as shown in Figure 4.
In the present invention, have employed shoulder Controlling principle, judge the steady operation angle of kink, principle is: in the region that curve is milder, and changes delta θ is very little on the impact of kink moment for kink angle; And in the region of curve steeper, kink angle changes delta θ is just very large on the impact of kink moment.Therefore, kink operating angle should drop on the milder region of curve as far as possible.
P4: when forebay cover gauge is calculated: composition graphs 3, calculates the cover amount when forebay, specific as follows:
Wherein:
Δ L is for working as protheca amount, unit mm;
The length of L1 kink fulcrum when between forebay to frame, unit mm;
L2 kink fulcrum to the length of kink work centre point, unit mm;
L3 kink work centre point to the length of next frame, unit mm;
Length between L frame, unit mm;
The current machine frame loop level angle of cos α;
Next machine frame loop level angle of cos β.
P5: the control of the steady cover amount of frame: the corresponding relation of loop length and kink angle is as follows, its waveform is shown in Fig. 5: in the present invention, in conjunction with the steady principle that loop length adopts equally, namely when kink angle is less, it is less equally to the change of cover amount, for this reason, loop length is selected equally in the less state of angle.Wherein, in deterministic process, have employed the kink current angular of step P2;
P6: adopt standardization process, obtain cover amount, moment, kink angle triadic relation as follows:
Specific practice asks gradient to the relation that upper figure describes, and then carries out standardization process, obtains two gradient curves, then get the intersection point of these two gradient curves, is namely desirable kink operating angle.
P7: determine kink best effort angle: in conjunction with above-mentioned standardization result, obtain the intersection point of two gradient curves, and using this crosspoint as kink best effort angle.
In sum, the related procedure of the control method of continuous hot-rolling mill moment cover amount of the present invention comprises step P1 to P7: threading stablize after moment inspecting, kink current angular detect, kink is when the calculation of protheca gauge, the steady Angle ambiguity of kink, the steady loop control of frame, standardization process and determine kink operating angle.
The present invention program in conjunction with hot tandem in the operation of rolling for the determination to best angle during kink Angle ambiguity, by the physical characteristic of different steel, in conjunction with the calculating of kink driving torque, to obtain best threading kink angle; And methods combining of the present invention loop length fluctuation, kink angle fluctuation and the relation under transmitting moment difference condition, achieve the stability contorting of kink.
Now the application example of the control method adopting continuous hot-rolling mill moment cover amount of the present invention is described as follows.
In this embodiment, in the operation of rolling, the corresponding stability contorting under different kink angles is followed the tracks of, and obtains data as shown in table 1:
Table 1
In conjunction with above-mentioned calculating, obtain best kink operating angle as shown in table 2:
Table
Table 2
By the determination of above-mentioned best angle, achieve the optimized control of the kink angle of band steel in the operation of rolling, the rolling stability of the hot tandem of raising;
Should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Claims (7)
1. a control method for continuous hot-rolling mill moment cover amount, is characterized in that, comprise the following steps:
Threading stablize after the detection of kink moment;
Kink current angular detects;
The steady Angle ambiguity of kink;
When forebay cover gauge is calculated;
The control of the steady cover amount of frame;
Adopt standardization process, obtain the triadic relation of cover amount, moment, kink angle; And
Determine kink best effort angle.
2. the control method of continuous hot-rolling mill moment cover amount according to claim 1, it is characterized in that, in the detecting step of the kink moment after threading is stablized, when object tape steel tensional fixation, kink moment is the function of kink angle, wherein kink dead-load moment and compensating torque are all determined by working curve, kink dead-load moment and compensating torque, obtained by kink pressure-measuring head.
3. the control method of continuous hot-rolling mill moment cover amount according to claim 1 and 2, it is characterized in that, in the step of the steady Angle ambiguity of kink, be the function curve according to its kink moment and kink angle under different moment and mild Region control principle, kink operating angle is selected in the milder region of curve.
4. the control method of continuous hot-rolling mill moment cover amount according to claim 1 and 2, is characterized in that, the step calculated when forebay cover gauge is according to following formulae discovery:
Wherein:
Δ L is for working as protheca amount, unit mm;
The length of L1 kink fulcrum when between forebay to frame, unit mm;
L2 kink fulcrum to the length of kink work centre point, unit mm;
L3 kink work centre point to the length of next frame, unit mm;
Length between L frame, unit mm;
The current machine frame loop level angle of cos α;
Next machine frame loop level angle of cos β.
5. the control method of continuous hot-rolling mill moment cover amount according to claim 4, it is characterized in that, in the step of the steady control of cover amount of frame: according to corresponding relation curve and the steady principle of loop length and kink angle, make loop length select in the less state of angle equally; Described kink angle is the kink current angular measured by kink current angular detecting step.
6. the control method of continuous hot-rolling mill moment cover amount according to claim 5, it is characterized in that, in standardization treatment step, triadic relation according to obtained cover amount, moment, kink angle asks gradient, then standardization process is carried out, to obtain cover amount gradient and setting moment gradients two gradient curves.
7. the control method of continuous hot-rolling mill moment cover amount according to claim 6, it is characterized in that, determining in kink best effort angle steps, it is the standardization result in conjunction with obtaining in described standardization treatment step, obtain the intersection point of two gradient curves, and using this crosspoint as kink best effort angle.
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| CN201410010245.2A CN104772337A (en) | 2014-01-09 | 2014-01-09 | Method for controlling torque loop quantity of hot continuous rolling mill |
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| CN201410010245.2A CN104772337A (en) | 2014-01-09 | 2014-01-09 | Method for controlling torque loop quantity of hot continuous rolling mill |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111618092A (en) * | 2020-06-01 | 2020-09-04 | 宝钢湛江钢铁有限公司 | Control method for reducing scratch defects of thick plate finish rolling |
| CN113305157A (en) * | 2021-05-12 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining gravity data of loop roller |
| CN113732080A (en) * | 2021-07-23 | 2021-12-03 | 阳春新钢铁有限责任公司 | Control system and method for looping head to get big loop |
| CN114453433A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment and computer equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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| CN113305157A (en) * | 2021-05-12 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining gravity data of loop roller |
| CN113732080A (en) * | 2021-07-23 | 2021-12-03 | 阳春新钢铁有限责任公司 | Control system and method for looping head to get big loop |
| CN114453433A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment and computer equipment |
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Application publication date: 20150715 |