KR20190050567A - Cooling system and control method thereof - Google Patents

Abstract

According to a technical aspect of the present invention, a cooling system is provided. The cooling system cools a material by using a plurality of cooling paths, and comprises: an inlet side thermometer provided at an inlet side of an N^th cooling path, and measuring an inlet side temperature of a portion of the material; an outlet side thermometer provided at an outlet side of the N^th cooling path, and measuring an outlet side temperature of the portion of the material; and a control unit setting a cooling flow rate and a transfer speed in the N^th cooling path using the inlet side temperature, and calculating a waiting time for an (N+1)^th cooling path using the outlet side temperature.

Description

[0001] COOLING SYSTEM AND CONTROL METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling system capable of cooling a material such as a steel sheet and its control method.

The cooling process in the production process of steel sheet is an important process to determine the quality and formability of the steel sheet.

Particularly, in the case of a thick material such as a steel sheet, since the effect of cooling is reflected differently depending on the thickness of the material, there is a difficulty in cooling the steel material to a desired level of cooling.

Conventionally, a plurality of cooling passes are provided in a water-cooled environment, and the material is passed through the plurality of cooling passes in order to improve the efficiency of the cooling process.

However, in such a conventional case, there is a difficulty in varying the cooling control of each cooling path in the cooling process. Particularly in the case of the thick material as described above, the quality of the material is deteriorated due to the difference between the actual cooling result and the expected cooling value And the like.

Such prior art can be easily understood with reference to Korean Laid-Open Patent Publication No. 2013-0074327, Korean Laid-Open Patent Publication No. 2012-0119032, and the like.

Korean Patent Laid-Open Publication No. 2013-0074327 Korea Patent Publication No. 2012-0119032

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an aspect of the present invention to provide a cooling system and a control method thereof that can more precisely control cooling of a material through individual control for a plurality of cooling passes .

In addition, one technical aspect of the present invention is to provide a cooling system and a control method thereof that can increase the accuracy of cooling and increase the cooling efficiency by applying air cooling in the transfer process between the water cooling and cooling pass in the cooling path in combination .

According to one technical aspect of the present invention, there is provided a temperature sensor on each of the inlet and the outlet of a cooling path, and the temperature depending on the thickness of the material is differently determined on the basis of the data sensed therefrom, And a control method of the cooling system.

One technical aspect of the present invention proposes a cooling system. Wherein the cooling system is a cooling system for cooling a workpiece using a plurality of cooling passes, the cooling system comprising: an inlet thermometer provided on an inlet side of an Nth cooling path for measuring an inlet temperature of a part of a workpiece; And an output thermometer for measuring an output temperature of the part of the material and a cooling flow rate and a feed rate in the Nth cooling pass using the input temperature, And a control unit for calculating a waiting time for the mobile terminal.

In one embodiment, the control unit generates inlet temperature information of the material from the inlet temperature and applies the inlet temperature information to the cooling model to set the cooling flow rate and the conveying speed in the Nth cooling pass The waiting time for the (N + 1) -th cooling path is calculated by reflecting the input target temperature of the (N + 1) th cooling path and the output temperature information of the workpiece from the first controller and the output temperature, And a second controller for calculating the second controller.

In one embodiment, the incoming temperature information and the outgoing temperature information may include a surface temperature of the workpiece and a temperature of the workpiece by an internal depth.

In one embodiment, the second controller can set the waiting time for the Nth path of the material by comparing the input-side temperature information with the target inlet temperature set in the cooling model.

In one embodiment, the cooling system further includes a transfer unit for transferring the material in the cooling system under the control of the control unit, and the transfer unit is configured to wait the material outside the cooling path during the waiting time, The material can be air-cooled.

Another technical aspect of the present invention proposes a method of controlling a cooling system. The control method of the cooling system is a control method of a cooling system that is performed in a cooling system that cools a workpiece using a plurality of cooling passes. The method includes the steps of: A step of setting a cooling flow rate and a conveying speed in the Nth cooling path using the input temperature, and a step of setting the cooling flow rate and the conveying speed in the Nth cooling path using the output thermometer provided on the exit side of the Nth cooling path, And calculating the waiting time for the (N + 1) -th cooling pass using the output temperature.

In one embodiment, the step of setting the cooling flow rate and the feed rate in the Nth cooling pass includes generating inlet temperature information of the material from the inlet temperature and applying the inlet temperature information to the cooling model to calculate N And setting the cooling flow rate and the feed rate in the first cooling pass.

In one embodiment, the step of calculating the waiting time for the (N + 1) th cooling path using the output temperature may include generating the output temperature information of the material from the output temperature, And calculating the waiting time for the (N + 1) th cooling path by reflecting the target temperature and the temperature information of the material on the exit side.

In one embodiment, the control method of the cooling system may further comprise setting a waiting time for the Nth path of the material by comparing the input temperature information with a target inlet temperature set in the cooling model have.

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

According to one embodiment of the present invention, cooling of a workpiece can be more accurately controlled through individual control for a plurality of cooling passes.

According to one embodiment of the present invention, the side surface provides the effect of increasing the cooling accuracy and increasing the cooling efficiency by applying the air cooling in the transfer process between the water cooling and cooling pass in the cooling pass in combination.

According to one embodiment of the present invention, temperature sensors are provided on the inlet and the outlet of the cooling pass, respectively, and the temperature according to the thickness of the workpiece is differently determined based on the data sensed from them, It is possible to perform the cooling process accurately even for the material of the base material.

1 is a view showing a production process of a steel sheet to which the present invention is applied.
2 is a diagram showing an example of one cooling pass in one embodiment of the present invention.
Fig. 3 is a diagram showing examples of adjusting the cooling water flow rate in one cooling pass in one embodiment of the present invention. Fig.
Fig. 4 is a graph showing cooling temperature characteristics of the blank in the examples shown in Fig. 3; Fig.
5 is a block diagram illustrating a cooling system according to an embodiment of the present invention.
6 is a block diagram illustrating an embodiment of the control unit shown in FIG.
7 is a flowchart illustrating an example of a control method of a cooling system according to an embodiment of the present invention.
8 is a flowchart illustrating another example of the control method of the cooling system according to the embodiment of the present invention.
FIG. 9 is a graph showing the temperature of the material cooled in the multipass according to one application example of the present invention.

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

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive.

Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a view showing a production process of a steel sheet or the like to which the present invention is applied.

In the illustrated example, the material of the steel sheet or the like is manufactured through the heating furnace 10, the finish rolling mill 21, the longitudinal finish rolling mill 22, the cooling system 100 and the hot straightening machine 40 . Although not shown, according to an embodiment, a production process may further include a calibration process for the material.

In the illustrated example, the cooling system 100 consists of two cooling passes 101, 102, but this is exemplary. Thus, the cooling system 100 may include three or more cooling passes.

2 is a diagram showing an example of one cooling pass in one embodiment of the present invention.

As shown in Fig. 2, in one embodiment of the present invention, an inlet thermometer 201 is provided at the inlet side of the one cooling pass 202, and an outlet thermometer 203 is provided at the outlet side thereof.

As a result, it is possible to confirm the actual temperature of the material input into one cooling pass and the actual temperature of the material output from one cooling pass, respectively.

Thus, the cooling system can perform the cooling more accurately by identifying the difference between the measured temperature and the calculated temperature on the cooling system, and by correcting the calculation in the cooling system to reflect this difference.

Further, the cooling system checks the actual temperature of the material output from the cooling pass and the difference between the starting target temperature in the next cooling pass, that is, the temperature of the material input in the cooling path set in the cooling system, By setting the waiting time to air-cool the material, cooling of the material can be performed accurately.

Fig. 3 is a diagram showing examples of adjusting the cooling water flow rate in one cooling pass in one embodiment of the present invention. Fig.

The cooling system is capable of individually controlling the cooling water flow rate for a plurality of cooling passes. That is, the cooling system can adjust the cooling water flow rate and the traveling speed of the material to meet the cooling target in each cooling pass.

Figure (a) shows an example in which a plurality of nozzles (F1 to F6) included in one cooling pass provides the same cooling water flow rate as the material progresses.

FIG. 5B shows an example in which a plurality of cooling water valves included in one cooling path are adjusted to set different cooling flow rates for the nozzles F1 to F6 according to the progress of the work.

Thus, the cooling system can control the flow rate of the cooling water for each nozzle even in one cooling pass, thereby accurately controlling the temperature of the material.

Fig. 4 is a graph showing cooling temperature characteristics of the blank in the examples shown in Fig. 3; Fig.

Fig. 4 (a) is an example of the cooling temperature characteristic of the material in the case of Fig. 3 (a), and Fig. 4 (b) is an example of the cooling temperature characteristic of the material in the case of Fig. FIG.

In the graph shown, depending on the temperature and time of the material, the material may be changed to ferrite, pearlite, bainite, or the like.

Therefore, the cooling system can control the cooling time and the temperature so as to form the required material texture.

Hereinafter, such a cooling system will be described in more detail with reference to Figs. 5 to 8. Fig.

5 is a block diagram illustrating a cooling system according to an embodiment of the present invention.

The cooling system can cool the workpiece by a plurality of cooling passes.

The cooling system 100 may include an inlet thermometer 111 provided at the entrance of each pass, an exit thermometer 112 provided at the exit of each pass, and a controller 140. The cooling system 100 may further include a cooling unit 120 and a transfer unit 130.

The inlet thermometer 111 is provided at the inlet side of the cooling pass and can measure the inlet temperature of a part of the material.

The exit thermometer 112 is provided on the exit side of the cooling path and can measure the exit temperature of the part of the work.

That is, the inlet thermometer 111 and the outlet thermometer 112 can measure the temperature of the same part of the work, and the surface temperature can be measured.

In one embodiment, one thermometer can be utilized as the entry thermometer 111 and the exit thermometer 112. For example, one thermometer is provided between the N (N is a natural number) cooling path and the (N + 1) th cooling path, and this thermometer serves as an output thermometer for the Nth cooling pass, As shown in FIG. According to an embodiment of the present invention, the transfer part may transfer the material to the front and rear of the one thermometer.

The cooling part 120 is provided in each cooling path, so that the material can be cooled. The cooling unit 120 may cool the material by controlling the flow rate of the cooling water under the control of the controller 140, as described with reference to FIG. 2 to FIG.

The transfer unit 130 can move the material. According to the embodiment, the transfer unit 130 can wait for the waiting time for the material, or adjust the transfer rate so that it is input to any cooling path in accordance with the waiting time.

That is, in the present invention, the waiting time means the time from the output of one cooling pass to the input of the next cooling pass. Therefore, it means a time when the material is transported, and it does not mean simply that the material stops and waits.

The controller 140 compares the measured temperature obtained from the incoming thermometer 111 and the output thermometer 112 with the internally set or calculated temperature to adjust the cooling flow rate and moving speed of the material or the waiting time between cooling passes And air cooling can be performed.

Specifically, the controller 140 can set the cooling flow rate and the feed rate in each cooling pass using the input temperature.

Further, the control unit 140 sets the waiting time (hereinafter referred to as " waiting time for the (N + 1) th cooling path ") until the material enters the (N + 1) So that the material can be air-cooled to compensate for the temperature difference generated between the respective passes.

The control unit 140 may be implemented as a processing unit or a computing device.

The computing device may include at least one processing unit and memory. The processing unit may include a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) And may have a plurality of cores. The memory 1120 can be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.) or a combination thereof.

The computing device may also include additional storage. Storage includes, but is not limited to, magnetic storage, optical storage, and the like.

FIG. 6 is a block diagram illustrating an embodiment of the control unit shown in FIG. 5. Referring to FIG. 6, an exemplary embodiment of the control unit will be described in detail.

Referring to FIG. 6, the controller 140 may include a first controller 141 and a second controller 142.

The first controller 141 can regulate the cooling in each cooling pass.

Specifically, the first controller 141 can generate the input-side temperature information of the material from the input-side temperature measured in the incoming thermometer.

Herein, the input-side temperature information may include the surface temperature of the material and the temperature of the inside depth of the material. In other words, the first controller 141 can calculate the temperature for each thickness of the work by using the input side temperature of the surface measured in the incoming thermometer.

The first controller 141 may apply the inlet temperature information to the predetermined cooling model to set the cooling setting in the Nth cooling pass, for example, the cooling flow rate and the feed speed.

In one embodiment, the first controller 141 may calculate the predicted temperature of the material that has changed according to the cooling flow rate and the feed rate in the Nth cooling pass. The first controller 141 can calculate the temperature for each thickness of the work according to the Nth cooling result from the surface temperature of the workpiece measured at the exit thermometer of the Nth cooling pass. The controller 141 then compares the predicted temperature of the material with the changed temperature of the material according to the Nth cooling result and reflects the difference to the cooling model to compensate the difference between the measured value of the temperature and the calculated value. Can be reset.

The second controller 141 may calculate the waiting time and adjust the movement of the material between the cooling passes by reflecting the waiting time.

Specifically, the second controller 141 generates the exit temperature information of the work from the exit temperature detected by the exit thermometer, reflects the entry target temperature of the (N + 1) th cooling path and the exit temperature information of the work, The waiting time for the +1 st cooling pass can be calculated.

Here, the output temperature information may also include the surface temperature of the material and the temperature by the inner depth of the material. That is, the second controller 142 can calculate the temperature for each thickness of the work using the temperature of the surface of the surface measured in the output thermometer.

In one embodiment, the second controller 141 can set the waiting time for the Nth path, i.e., the input waiting time, using the input temperature detected in the incoming thermometer. That is, the second controller 141 can set the waiting time for the Nth pass of the material by comparing the input temperature information with the target inlet temperature set in the cooling model. In this case, it is possible to control the Nth path to be inoperative during the waiting time, or to perform the input waiting by transferring the material in the reverse direction.

In the above description, one cooling pass is mainly described, but the control unit 140 can control a plurality of cooling paths in association with each other.

In one embodiment, the control unit 140 may first set the start target temperature and the end target temperature for each cooling pass, and the cooling settings (cooling flow rate and feed rate in the path) for each cooling pass.

Thereafter, the control unit 140 can control the first controller 141 and the second controller 142 according to the above description by operating the respective cooling paths.

In the foregoing, various embodiments of the cooling system according to the present invention have been described with reference to Figs. 2-6.

Hereinafter, various embodiments of the control method of the cooling system will be described with reference to Figs. 7 to 8. Fig.

However, various embodiments of the control method of the cooling system to be described below are performed in the cooling system described above with reference to Figs. 2-6. Thus, it will be more readily understood with reference to the above description with reference to Figures 2 to 6, and the same description will be omitted without redundant description.

7 is a flowchart illustrating an example of a control method of a cooling system according to an embodiment of the present invention.

One embodiment of the control method of the cooling system shown in Fig. 7 is a flowchart for explaining a control method of the cooling system in any one of the plurality of cooling passes.

Referring to FIG. 7, the cooling system can measure the inlet temperature of a part of the material using the inlet thermometer provided at the inlet side of the Nth cooling pass (S701).

Thereafter, the cooling system can set the cooling flow rate and the feed rate in the Nth cooling path using the inlet temperature (S702).

The cooling system can measure the temperature at the exit of the part of the material using an output thermometer provided at the exit of the Nth cooling pass (S703).

Thereafter, the cooling system can calculate the waiting time for the (N + 1) th cooling path using the output temperature (S704).

In an embodiment of step S702, the cooling system may generate inlet temperature information of the work from the inlet temperature. Thereafter, the cooling system can set the cooling flow rate and the feed rate in the Nth cooling pass by applying the inlet temperature information to the cooling model.

In one embodiment of step S704, the cooling system may generate the exit temperature information of the work from the exit temperature. Thereafter, the cooling system may calculate the waiting time for the (N + 1) th cooling path by reflecting the target temperature of the inlet side of the (N + 1) th cooling path and the outlet temperature information of the material.

Although not shown, the cooling system can set the waiting time for the Nth pass of the material by comparing the input temperature information with the target inlet temperature set in the cooling model.

8 is a flowchart illustrating another example of the control method of the cooling system according to the embodiment of the present invention.

One embodiment of the control method of the cooling system shown in Fig. 8 relates to an embodiment for controlling a plurality of cooling passes, and also a flowchart for explaining a control method for an embodiment for providing air cooling through input standby to be.

Referring to FIG. 8, the cooling system can first set the start target temperature and the end target temperature for each cooling pass, and the cooling setting (cooling flow rate and feed rate in the path) for each cooling pass (S801).

The cooling system can set the control path to the Nth cooling path (S802).

For the Nth cooling pass, the cooling system measures the incoming temperature (S803) and calculates the input waiting time (S804).

That is, the cooling system can compute the Nth pass waiting time (input waiting time) by comparing the cooling start target temperature of the Nth pass with the measured inlet temperature (S804).

If there is a waiting time, the cooling system can wait for air cooling for the waiting time (S806).

According to the embodiment, the cooling system may re-measure the incoming temperature and perform temperature correction on the incoming-side temperature setting of the cooling model based on the re-measured result (S807).

If there is no waiting time or the air cooling wait is completed, the cooling system may calculate the flow rate and feed rate of the Nth cooling pass, and perform the cooling in the Nth cooling pass according to the calculated values (S808). This can be easily understood from the above.

The cooling system measures the output temperature (S809), and calculates the waiting time until the input of the (N + 1) th cooling pass after the output of the Nth cooling pass (S810).

That is, the cooling system compares the cooling start target temperature of the (N + 1) th pass with the measured inlet temperature to calculate the N + 1 pass wait time (S810).

If the Nth pass is the last, the cooling system terminates the control.

If the Nth path is not the last, the control path is set to the (N + 1) th cooling path and the above steps are repeated (S812).

FIG. 9 is a graph showing the temperature of the material cooled in the multipass according to one application example of the present invention.

As shown in Fig. 9, when cooling is performed in each cooling pass, the temperature is cooled differently depending on the thickness of the material.

Thereafter, the cooling system according to the present invention can set the actual temperature of the material in the next pass to be similar to the target starting temperature by setting the waiting time while moving the material between the respective passes.

According to the waiting time, the difference between the temperature calculated in the cooling system and the actual temperature can be minimized, and accordingly the cooling can be accurately performed even for the thick material.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

10: rough rolling mill
20: Finishing mill
111: first measuring unit 112: second measuring unit
120: camber control unit
200: Hot rolling rolling correction device
210: rough rolling level calculating section 220: finishing rolling correction calculating section
230: Finishing rolling correction application part

Claims (9)

A cooling system for cooling a work using a plurality of cooling passes,
An inlet thermometer provided on the inlet side of the Nth cooling pass for measuring an inlet temperature of a part of the material;
An exit thermometer provided on an exit side of the Nth cooling path for measuring an exit temperature of the part of the material; And
A controller for setting a cooling flow rate and a feed rate in the Nth cooling path using the input temperature and calculating a waiting time for an (N + 1) th cooling path using the output temperature;
≪ / RTI >
The apparatus of claim 1, wherein the control unit
A first controller for generating inlet temperature information of the material from the inlet temperature and applying the inlet temperature information to the cooling model to set the cooling flow rate and the conveying speed in the Nth cooling pass; And
And a controller for generating output temperature information of the material from the output temperature and calculating a waiting time for the (N + 1) th cooling path by reflecting the input target temperature of the (N + 1) A controller;
≪ / RTI >
The method of claim 2, wherein the input temperature information and the output temperature information are
A surface temperature of the workpiece, and a temperature by an internal depth of the workpiece.
4. The apparatus of claim 3, wherein the second controller
And compares the input temperature information with a target inlet temperature set in the cooling model to set a waiting time for the Nth cooling pass of the material.
5. The system of claim 4, wherein the cooling system
A transfer unit for transferring the material in the cooling system under the control of the control unit;
Further comprising:
The conveying portion
And cooling the material by air by waiting the material outside the cooling path during the waiting time.
A method of controlling a cooling system performed in a cooling system for cooling a workpiece using a plurality of cooling passes,
Measuring an inlet temperature of a part of the material using an inlet thermometer provided at an inlet side of an Nth cooling pass;
Setting a cooling flow rate and a feed rate in the Nth cooling pass using the inlet temperature;
Measuring an output temperature of the part of the material using an output thermometer provided on an output side of the Nth cooling path; And
Calculating a waiting time for an (N + 1) -th cooling pass using the output temperature;
And a control system for controlling the cooling system.
The method as claimed in claim 6, wherein the step of setting the cooling flow rate and the feed rate in the Nth cooling path
Generating inlet temperature information of the material from the inlet temperature; And
Applying the inlet temperature information to a cooling model to set the cooling flow rate and the feed rate in the Nth cooling pass;
And a control system for controlling the cooling system.
The method of claim 6, wherein calculating the waiting time for the (N + 1) th cooling pass using the output temperature
Generating output temperature information of the material from the output temperature; And
Calculating a waiting time for the (N + 1) -th cooling path by reflecting an inlet-side target temperature of the (N + 1) -th cooling pass and an outlet temperature information of the material;
And a control system for controlling the cooling system.
8. The method according to claim 7, wherein the control method of the cooling system
Comparing the input temperature information with a target inlet temperature set in the cooling model to set a waiting time for the Nth cooling pass of the material;
Lt; RTI ID = 0.0 > 1, < / RTI >

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