CN104070074A - A method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack - Google Patents
A method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack Download PDFInfo
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- CN104070074A CN104070074A CN201310097879.1A CN201310097879A CN104070074A CN 104070074 A CN104070074 A CN 104070074A CN 201310097879 A CN201310097879 A CN 201310097879A CN 104070074 A CN104070074 A CN 104070074A
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Abstract
The invention discloses a method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack. The method includes the following four steps. S100: during the milling course, when the head of strip steel reaches the spraying position of strip steel entrance side spray openings, the entrance side spraying openings are opened, the strip steel is sprayed with emulsion, and the spraying flow of the entrance side spraying openings is in direct proportion to the milling speed. S200: when the head of strip steel reaches the spraying position of strip steel exit side spraying openings , the exit side spraying openings are opened, and the head of the strip steel is sprayed with emulsion with the initial flow. S300: the temperature of the head of the strip steel sprayed with emulsion in the step S200 is checked and the actual temperature is obtained. S400: according to the difference value of the actual temperature and the target temperature, compensation flow is calculated with the following formula. With the method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack, the temperature of steel plates of strip steel at the exit can be accurately controlled.
Description
Technical field
The temperature the present invention relates in belt steel rolling is controlled, and more specifically, is a kind of plate temperature control method for singlestandmill high temperature rolling.
Background technology
Singlestandmill (comprising the different arrangement forms such as 4 rollers, 6 rollers and the 20 rollers) features such as housing rigidity is large, minimum rolled thickness is little owing to having, plate shape control ability is strong, be particularly suitable for the production of high strength, Ultra-thin band steel, can be used for special steel, stainless steel, the contour grade steel grade of silicon steel field.
In singlestandmill, dispose cooling line, for utilizing emulsion to spray the processing of lower the temperature of band steel, cooling line is being with steel entrance side and outlet side to be all furnished with jet.For adapting to the rolling mill practice requirement of different steel grades, singlestandmill comprises zerolling and two kinds of emulsion jet modes of high temperature rolling.Wherein high temperature rolling adopts rolling direction entrance to spray emulsion, oily mode (be with steel entrance side jet to open, outlet side jet is closed) is closed in outlet, and emulsion is large flow.Emulsion eject position 1,2,3,4 as shown in Figure 1, for simplicity, has only marked the cooling of the working roll 10 relevant to plate temperature control and with the cooling two-way emulsion eject position of steel 20 in figure.Wherein, position 1 is band steel cooling injection position, left side, and position 2 is working roll cooling injection position, left side, and position 3 is working roll cooling injection position, right side, and position 4 is band steel cooling injection position, right side.
High temperature rolling mode, is the steel grade that has high temperature rolling requirement for some, requires rolling direction exit plate temperature more than 150 ℃.To high temperature rolling mode, employing be that oily mode is closed in rolling direction outlet, the belt steel rolling direction of take is example from left to right, now an emulsion open position 2, be left roller cooling injection position, utilize rolling deformation heat to realize with being rapidly heated of steel, to meet technique to the requirement with steel high temperature rolling.Rolling emulsion eject position is contrary from right to left, emulsion open position 3, i.e. right roller cooling injection position.
From high temperature rolling working control process, mill speed is to control the Main Means of exit plate temperature, and mill speed is faster, and the distortion heat of unit interval is more, exit plate Wen Yuegao.Therefore, existing temperature is controlled the technology mode that has adopted emulsion injection flow to mate with mill speed.Set specific curves, take mill speed as input quantity, emulsion injection flow is output quantity, by this way, under the normal condition of production, by setting intensification ladder that each passage is suitable and suitable flow, with mill speed, increase curve, can be by the temperature control of high temperature rolling exit plate within the specific limits.But, rely on this kind of control mode, can not reach accurate control with the object of steel plate temperature.In actual production, can cause being with the problems such as steel length direction top tailgate temperature exceeding standard rate is higher.
Summary of the invention
Object of the present invention, be to solve existing for singlestandmill when the high temperature rolling to the above-mentioned deficiency aspect steel plate temperature control, thereby a kind of plate temperature control method for singlestandmill high temperature rolling of innovation is provided.
The present invention is for the plate temperature control method of singlestandmill high temperature rolling, plate temperature for singlestandmill when carrying out high temperature rolling with steel is controlled, wherein, this singlestandmill disposes cooling pipe, this cooling pipe is provided with spout in band steel entrance side and the band steel exports side of this singlestandmill, and can be by this spout to spraying emulsion, with processing that band steel is lowered the temperature, the method comprises the steps:
Step S100, in the operation of rolling with steel head, march to this eject position with steel entrance side spout time, open this entrance side spout, to utilize emulsion to spray, injection flow and the mill speed of this entrance side spout are directly proportional;
Step S200, when with steel head, march to steel exports side spray mouth eject position time, open this outlet side spout, and utilize emulsion to spray with initial flow;
Step S300, detects the temperature with steel head of spraying through step S200, draws actual temperature;
Step S400, according to the difference DELTA T of this actual temperature and target temperature, utilizes following formula to calculate compensating flowrate Δ V:
Wherein, C
fBfor proportionality coefficient, g
sfor the coefficient time of integration, g
mfor time constant, T
lfor with steel from outlet side eject position to the time between temperature measuring point, L
dfor with steel from outlet side eject position to the distance between temperature measuring point, V
sfor mill speed, f is advancing slip coefficient;
Step S500, according to this compensating flowrate, to adjusting with the injection flow of steel exports side spray mouth.
Above-mentioned entrance side spout is working roll cooled nozzle.Above-mentioned outlet side spout is band steel cooled nozzle or working roll cooled nozzle.
Use the plate temperature control method for singlestandmill high temperature rolling of the present invention, can the exit plate temperature with steel accurately be controlled, thereby reach the object of improving the quality of products, meeting controlling of production process, guarantee production stable operation.
Accompanying drawing explanation
Fig. 1 utilizes singlestandmill to the process schematic representation being rolled with steel;
Fig. 2 is the schematic flow sheet of the plate temperature control method for singlestandmill high temperature rolling of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, step, operation principle and the substantive distinguishing features of the plate temperature control method for singlestandmill high temperature rolling of the present invention are described in more detail.
In general, the present invention for singlestandmill the plate temperature when carrying out high temperature rolling with steel control, wherein, this singlestandmill disposes cooling pipe, this cooling pipe is provided with spout (as shown in Figure 1 in band steel entrance side and the band steel exports side of this singlestandmill, when rolling direction is for from left to right time, position 1, 2 is entrance side spout, position 3, 4 is outlet side spout), and can spray emulsion by this spout, with processing that band steel is lowered the temperature, the present invention is mainly that the entrance side spout of cooling line in singlestandmill high temperature rolling is opened on basis, increase rolling direction upper outlet side cooling, utilize outlet side spout to spray emulsion and carry out cooling processing, and outlet side injection flow can compensate adjusting according to observed temperature, finally make observed temperature reach target temperature, realizing closed loop automatic temperature-adjusting controls.
In conjunction with Fig. 2, the present invention comprises step S100-S500 haply, wherein, in step S100, in the operation of rolling with steel head, march to this eject position with steel entrance side spout time, open this entrance side spout, to utilize emulsion to spray; In step S200, when with steel head, march to steel exports side spray mouth eject position time, open this outlet side spout, and utilize emulsion to spray with initial flow speed; In step S300, the temperature with steel head of spraying through step S200 is detected, draw actual temperature; In step S400, according to this actual temperature and target temperature, calculate compensating flowrate; In step S500, according to this compensating flowrate, to adjusting with the injection flow of steel exports side spray mouth.
Below above steps is described in more detail.
step S100.
In conjunction with Fig. 1, in this step, start the rolling with steel 20, and, when marching to this eject position with steel entrance side spout with steel 20 heads, open this entrance side spout, to utilize emulsion to spray.As shown in Figure 1, when rolling direction is for from left to right time, this entrance side spout is working roll cooled nozzle (position 2 as shown in Figure 1).When entrance side cools, the injection flow (being the emitted dose in the unit interval) that emulsion sprays is relevant with mill speed.Particularly, injection flow V
entrancewith mill speed V
rollingbe directly proportional, can be expressed as follows:
V
entrance=a * V
rolling+ b; (formula 1)
Wherein, a, b are for setting constant, for determining the initial injection quantity of emulsion and the slope that raises and increase with mill speed.
Injection flow can regulate according to the aperture of the proportioning valve of cooling pipe.Easily understand, when proportioning valve aperture increases, injection flow increases; When proportioning valve aperture reduces, injection flow reduces.In addition, injection flow also can regulate by the rotating speed of motor.
Certainly, easily understand, the setting of entrance side injection flow, also can set fixing preset value according to every time mill speed after stable rolling, the temperature with steel after entrance side inject process can be controlled within the specific limits like this, thereby be realized the coarse adjustment of plate temperature control.
step S200.
When head with steel 20 is when 10 rollings arrive outlet sides and march to the eject position with steel exports side spray mouth through working roll, can open this outlet side spout, and utilize emulsion to spray with initial flow, with processing that band steel is lowered the temperature.This initial flow can be determined according to the same batch of outlet side flow with steel of early rolling.With the position class of step S100 entrance side spout seemingly, outlet side spout can be band steel cooled nozzle, the position in Fig. 14, can be also working roll cooled nozzle, i.e. position in Fig. 13.
step S300.
After the penetrating cooling down operation and complete of step S100, S200, the temperature with steel head is detected, draw actual temperature.In conjunction with Fig. 1, temperature detection utilization is arranged at the thermo detector that Pt orders and completes.This actual temperature feeds back to flow control system for following step.This flow system can make the intrinsic unit control system of single milling train.It can adjust control to the aperture of the corresponding proportioning valve of each spout of cooling line according to input signal, thereby reaches the object of controlling each spout emulsion flow.
step S400.
In this step, according to the difference DELTA T of this actual temperature and target temperature, utilize following formula to calculate compensating flowrate Δ V:
Wherein, C
fBfor proportionality coefficient, g
sfor the coefficient time of integration, g
mfor time constant, T
lfor with steel from outlet side eject position to the time between temperature measuring point, L
dfor with steel from outlet side eject position to the distance between temperature measuring point, V
sfor mill speed, f is advancing slip coefficient.
In above-mentioned parameter, advancing slip coefficient is a key parameter that characterizes rolling process stability, advancing slip value is negative value, roll is described and with in the operation of rolling roll of having occurred between steel skidding, has the linear velocity of rotation, band steel has entrance velocity and muzzle velocity, be with under normal circumstances steel exports speed slightly higher than the speed of rolls, advancing slip coefficient=(band steel exports speed-speed of rolls)/speed of rolls.
Thus, the difference by target temperature and actual temperature, calculates at T
ltime interval in integration calculate the regulated quantity Δ V of flow, by integral and calculating, can draw compensating flowrate.
step S500.
In this step, according to this compensating flowrate, to adjusting with the injection flow of steel exports side spray mouth.
After utilizing above-mentioned steps S400 to calculate compensating flowrate, system sends to the intrinsic PLC system of singlestandmill to carry out this compensating flowrate, PLC system and then put according to this compensating flowrate, aperture to the corresponding proportioning valve of spout with steel exports side is adjusted, thereby the injection flow of outlet side spout is regulated.So that approaching, belt steel temperature even reaches predetermined target temperature value.
After this, in ensuing belt steel rolling, repeat above-mentioned steps S400 to S500, to form the control feedback of closed loop, thereby belt steel temperature is stably controlled in the error range that target temperature allows.Easily understand, the number of times of closed loop feedback is more, and the belt steel temperature with steel after outlet side emulsion sprays will more approachingly even reach target temperature value, thereby realize the accurate modulation to exit plate temperature.
In sum, use the plate temperature control method for singlestandmill high temperature rolling of the present invention, can the exit plate temperature with steel accurately be controlled, thereby reach the object of improving the quality of products, meeting controlling of production process, guarantee production stable operation.And method of the present invention does not need additionally to add hardware configuration, has avoided the increase of production cost.
Claims (3)
1. the plate temperature control method for singlestandmill high temperature rolling, plate temperature for singlestandmill when carrying out high temperature rolling with steel is controlled, wherein, this singlestandmill disposes cooling pipe, this cooling pipe is provided with spout in band steel entrance side and the band steel exports side of this singlestandmill, and can be by this spout to spraying emulsion, with processing that band steel is lowered the temperature, it is characterized in that, the method comprises the steps:
Step S100, in the operation of rolling with steel head, march to this eject position with steel entrance side spout time, open this entrance side spout, to utilize emulsion to spray, injection flow and the mill speed of this entrance side spout are directly proportional;
Step S200, when with steel head, march to steel exports side spray mouth eject position time, open this outlet side spout, and utilize emulsion to spray with initial flow;
Step S300, detects the temperature with steel head of spraying through step S200, draws actual temperature;
Step S400, according to the difference DELTA T of this actual temperature and target temperature, utilizes following formula to calculate compensating flowrate Δ V:
Wherein, C
fBfor proportionality coefficient, g
sfor the coefficient time of integration, g
mfor time constant, T
lfor with steel from outlet side eject position to the time between temperature measuring point, L
dfor with steel from outlet side eject position to the distance between temperature measuring point, V
sfor mill speed, f is advancing slip coefficient;
Step S500, according to this compensating flowrate, to adjusting with the injection flow of steel exports side spray mouth.
2. the plate temperature control method for singlestandmill high temperature rolling according to claim 1, is characterized in that, described entrance side spout is working roll cooled nozzle.
3. the plate temperature control method for singlestandmill high temperature rolling according to claim 1, is characterized in that, described outlet side spout is band steel cooled nozzle or working roll cooled nozzle.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106311744A (en) * | 2016-08-18 | 2017-01-11 | 广西南南铝加工有限公司 | Production method capable of reducing black stripes on surface of aluminium coil |
| CN109821898A (en) * | 2019-02-13 | 2019-05-31 | 江苏恒丰新材料制造有限公司 | A method of realizing the low mist of oil discharge of cold continuous rolling process low energy consumption |
| CN113106217A (en) * | 2021-03-25 | 2021-07-13 | 广州市型腔模具制造有限公司 | Cold machining process for nozzle point |
| CN113560513A (en) * | 2021-08-11 | 2021-10-29 | 福州丹文科技有限公司 | Automatic control system for copper rod continuous casting and rolling |
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| CN113106217A (en) * | 2021-03-25 | 2021-07-13 | 广州市型腔模具制造有限公司 | Cold machining process for nozzle point |
| CN113560513A (en) * | 2021-08-11 | 2021-10-29 | 福州丹文科技有限公司 | Automatic control system for copper rod continuous casting and rolling |
| CN113560513B (en) * | 2021-08-11 | 2022-10-11 | 福州丹文科技有限公司 | Automatic control system for copper rod continuous casting and rolling |
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