CN114798762B - Method and device for controlling temperature of rolled piece - Google Patents
Method and device for controlling temperature of rolled piece Download PDFInfo
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- CN114798762B CN114798762B CN202210550755.3A CN202210550755A CN114798762B CN 114798762 B CN114798762 B CN 114798762B CN 202210550755 A CN202210550755 A CN 202210550755A CN 114798762 B CN114798762 B CN 114798762B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000005096 rolling process Methods 0.000 claims abstract description 108
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims description 113
- 239000000498 cooling water Substances 0.000 claims description 42
- 238000005259 measurement Methods 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 40
- 238000010586 diagram Methods 0.000 description 11
- 238000009749 continuous casting Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
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- 230000004048 modification Effects 0.000 description 4
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- 229910045601 alloy Inorganic materials 0.000 description 3
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- 239000007789 gas Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 238000009628 steelmaking Methods 0.000 description 2
- 229910001199 N alloy Inorganic materials 0.000 description 1
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- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- 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
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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Abstract
The invention discloses a method and a device for controlling the temperature of a rolled piece, wherein the method is applied to direct rolling equipment, the direct rolling equipment comprises a middle rolling mill, a cooler and a finishing mill which are sequentially arranged along the direct rolling traction direction of the rolled piece, and the method comprises the following steps: obtaining a target temperature of a current rolled piece entering the finishing mill; acquiring the current temperature of the current rolled piece at a target position, wherein the target position is the position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process; judging whether the current temperature is greater than the target temperature; and if yes, controlling the cooler to cool the target position to the target temperature. The control method controls the cooler to cool the target position to the target temperature, so that all parts of the rolled piece can be cooled to the target temperature before entering the finishing mill, the temperature uniformity of the rolled piece in the direct rolling process is improved, and the rolling quality of the rolled piece in the direct rolling process is further improved.
Description
Technical Field
The application relates to the technical field of temperature control of straight rolled pieces, in particular to a method and a device for controlling the temperature of rolled pieces.
Background
Rod wire rod without addingThe hot direct rolling production technology is to cancel the conventional heating process of a gas heating furnace to a billet, and convey the billet from a continuous casting machine to a rolling mill for direct rolling. The technology breaks the process limit between steel making and steel rolling, uniformly considers steel making, continuous casting and steel rolling, and is more beneficial to fully exerting the capability of each process. Has the great advantages of energy conservation and emission reduction, meets the national industrial policy requirements, and is beneficial to the cost reduction and efficiency improvement of steel enterprises. The heating-free direct rolling process has obvious economic benefit, can directly cancel the fuel gas consumption of the heating furnace, avoids the oxidation burning loss of the surface of the casting blank caused by the heating of the heating furnace, and can reduce the rolling cost. In addition, the environmental protection level can be obviously improved, and the CO generated by burning coal gas in the heating furnace can be reduced 2 、SO 2 And harmful gases, which are in line with national industrial policies, have good social benefits.
The conventional heating mode can realize the balanced heating of the whole length of the continuous casting blank, and the stability of the head, the middle and the tail of the continuous casting blank is balanced, and is generally in the range of 5-10 ℃. When in direct rolling, the head part of the continuous casting billet of the rolled piece is firstly discharged from the crystallizer, the tail part of the continuous casting billet is discharged from the crystallizer, the temperature of the head part of the continuous casting billet is lower than that of the middle part and the tail part of the continuous casting billet, and the temperatures of the head part, the middle part and the tail part of the continuous casting billet are in a trend of gradually rising. The unbalanced temperature of the continuous casting blank causes unbalanced final rolling temperature of the rolled piece, and the stability of the mechanical property of the direct-rolled piece is affected.
Therefore, how to improve the temperature uniformity of the rolled piece in the direct rolling process is a technical problem to be solved at present.
Disclosure of Invention
The method and the device for controlling the temperature of the rolled piece improve the temperature uniformity of the rolled piece in the direct rolling process.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling a temperature of a rolled piece, where the method is applied to a direct rolling apparatus, the direct rolling apparatus includes a middle rolling mill, a cooler, and a finishing mill sequentially disposed along a direct rolling traction direction of the rolled piece, and the method includes:
obtaining a target temperature of a current rolled piece entering the finishing mill;
acquiring the current temperature of the current rolled piece at a target position, wherein the target position is the position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process;
judging whether the current temperature is greater than the target temperature;
and if yes, controlling the cooler to cool the target position to the target temperature.
In an alternative embodiment, the cooler is a water-cooled cooler, and a flow valve for controlling cooling temperature is arranged on the water-cooled cooler; the controlling the chiller to cool the target location to the target temperature includes:
acquiring a cooling water quantity curve of the water-cooling cooler;
obtaining a target cooling temperature of the current rolled piece according to the current temperature and the target temperature;
and controlling the flow valve to be opened to a target opening degree to cool the target position according to the cooling water volume curve and the target cooling temperature.
In an alternative embodiment, the obtaining the cooling water volume curve of the water-cooled cooler includes:
acquiring the cooling temperature of the current rolled piece and the valve opening corresponding to the flow valve;
and obtaining the cooling water quantity curve according to the fitting relation between the cooling temperature and the opening of the valve.
In an alternative embodiment, the controlling the flow valve to open to a target opening degree according to the cooling water volume curve and the target cooling temperature to cool the target position includes:
acquiring a temperature dividing threshold value;
dividing the cooling water quantity curve according to the temperature dividing threshold value to obtain a plurality of cooling temperature intervals;
correspondingly obtaining flow opening of the flow valve according to a plurality of cooling temperature intervals, wherein one cooling temperature interval corresponds to one flow opening;
and controlling the flow valve to be opened to the corresponding flow opening degree to cool the target position according to the target cooling temperature.
In an alternative embodiment, the temperature division threshold is 10 ℃.
In an alternative embodiment, a first thermo detector is provided at a side of the target position along the direct rolling traction direction, and the obtaining the current temperature of the current rolled piece at the target position includes:
acquiring a preset acquisition period of the first thermometer;
measuring the target position according to the preset acquisition period to obtain a current measurement result;
and obtaining the current temperature according to the current measurement result.
In an alternative embodiment, after the controlling the cooler to cool the target position to the target temperature, the method further includes:
acquiring the current specification of the current rolled piece;
obtaining cooling parameters for controlling the cooler to cool the current rolled piece;
and storing the cooling parameters according to the current specification correspondence to obtain a standard cooling process of the current rolled piece.
In a second aspect, an embodiment of the present invention further provides a device for controlling a temperature of a rolled piece, where the device is applied to a direct rolling apparatus, the direct rolling apparatus includes a middle rolling mill, a cooler, and a finishing mill sequentially disposed along a direct rolling traction direction of the rolled piece, and the device includes:
the first acquisition module is used for acquiring the target temperature of the current rolled piece entering the finishing mill;
the second acquisition module is used for acquiring the current temperature of the current rolled piece at a target position, wherein the target position is a position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process;
the judging module is used for judging whether the current temperature is greater than the target temperature or not;
and the control module is used for controlling the cooler to cool the target position to the target temperature when the current temperature is greater than the target temperature.
In an alternative embodiment, the cooler is a water-cooled cooler, and a flow valve for controlling cooling temperature is arranged on the water-cooled cooler; the control module comprises:
the first acquisition submodule is used for acquiring a cooling water quantity curve of the water-cooling cooler;
the first obtaining submodule is used for obtaining the target cooling temperature of the current rolled piece according to the current temperature and the target temperature;
and the first control submodule is used for controlling the flow valve to be opened to a target opening degree to cool the target position according to the cooling water volume curve and the target cooling temperature.
In an alternative embodiment, the first acquisition sub-module includes:
the first acquisition unit is used for acquiring the cooling temperature of the current rolled piece and the valve opening corresponding to the flow valve;
the first obtaining unit is used for obtaining the cooling water volume curve according to the fitting relation between the cooling temperature and the valve opening.
In an alternative embodiment, the first control sub-module includes:
a second acquisition unit configured to acquire a temperature division threshold;
the second obtaining unit is used for dividing the cooling water quantity curve according to the temperature dividing threshold value to obtain a plurality of cooling temperature intervals;
a third obtaining unit, configured to correspondingly obtain flow opening degrees of the flow valves according to a plurality of cooling temperature intervals, where one cooling temperature interval corresponds to one flow opening degree;
and the control unit is used for controlling the flow valve to be opened to the corresponding flow opening degree to cool the target position according to the target cooling temperature.
In an alternative embodiment, a first thermo detector is disposed on a side surface of the target position along the direct rolling traction direction, and the second acquisition module includes:
the second acquisition sub-module is used for acquiring a preset acquisition period of the first thermometer;
the second obtaining submodule is used for measuring the target position according to the preset acquisition period and obtaining a current measurement result;
and a third obtaining sub-module, configured to obtain the current temperature according to the current measurement result.
In an alternative embodiment, the control device further comprises:
the third acquisition module is used for acquiring the current specification of the current rolled piece;
a fourth obtaining module, configured to obtain a cooling parameter for controlling the cooler to cool the current rolled piece;
and the obtaining module is used for correspondingly storing the cooling parameters according to the current specification and obtaining the standard cooling process of the current rolled piece.
In a third aspect, embodiments of the present invention also provide an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any one of the first aspects.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the steps of the method according to any of the first aspects.
Compared with the prior art, the method and the device for controlling the temperature of the rolled piece have the following advantages:
the control method is applied to the direct rolling equipment, when the rolled piece sequentially passes through the direct rolling equipment of the intermediate rolling machine, the cooler and the finishing rolling machine, the current temperature of the position between the intermediate rolling machine and the cooler of the current rolled piece is obtained by obtaining the target temperature of the rolled piece in the finishing rolling process, and when the current temperature is higher than the target temperature, the cooler is controlled to cool the target position to the target temperature, so that all parts of the rolled piece can be accurately cooled to the target temperature before entering the finishing rolling machine, the temperature uniformity of the rolled piece in the direct rolling process is improved, and the rolling quality of the rolled piece in the direct rolling process is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling the temperature of a rolled piece according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a direct rolling apparatus according to an embodiment of the present invention;
FIG. 3 is another flow chart of a method for controlling the temperature of a rolled piece according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the temperature change of a rolled piece after implementing the control method according to the embodiment of the present invention;
FIG. 5 is a schematic drawing of the tensile strength of a rolled stock after implementing the control method of an embodiment of the present invention;
FIG. 6 is a schematic representation of the yield strength of a rolled stock after implementing the control method of an embodiment of the present invention;
FIG. 7 is a schematic diagram of the temperature change of a rolled piece prior to implementing the control method according to an embodiment of the present invention;
FIG. 8 is a schematic representation of the tensile strength of a rolled stock prior to implementing a control method according to an embodiment of the present invention;
FIG. 9 is a schematic representation of the yield strength of a rolled stock prior to implementing the control method of an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a device for controlling the temperature of a rolled piece according to an embodiment of the present invention.
The reference numerals indicate a 1-middle rolling mill, a 2-cooler, a 3-finishing mill, a 4-rolled piece, a 5-second thermometer, a 6-first thermometer and a 7-flow valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling a temperature of a rolled piece, where the method is applied to a direct rolling apparatus, referring to fig. 2, fig. 2 is a schematic structural diagram of the direct rolling apparatus, where the direct rolling apparatus includes a middle rolling mill 1, a cooler 2, and a finishing mill 3 sequentially arranged along a direct rolling traction direction of the rolled piece, and a rolled piece 4 is rolled by the middle rolling mill 2 and the finishing mill 3 at a preset speed under the traction of the rolls of the middle rolling mill 2 and the finishing mill 3, and then cooled by the cooler 2, and finally rolled by the finishing mill into a target shape and specification, where the method includes:
s11, acquiring the target temperature of the current rolled piece entering the finishing mill.
Specifically, in the direct rolling process, the target temperature of the rolled piece may be generally determined according to the direct rolling process, and thus, the target temperature may be obtained according to the direct rolling process, and the target temperature may be a temperature range determined through the direct rolling process. After the target temperature is obtained, the process advances to step S12.
S12, acquiring the current temperature of the current rolled piece at a target position, wherein the target position is the position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process.
Specifically, the current temperature can be obtained by measuring the first temperature detector 6 arranged at one side of the current rolled piece at the target position, and the first temperature detector 6 can be a laser temperature detector or an infrared temperature detector and can be used for measuring the current temperature of the current rolled piece at the target position; of course, the current temperature may also be calculated by the relevant parameters in the direct rolling process to obtain the temperature of the current product at the outlet of the intermediate rolling mill, i.e. the current temperature.
In a specific embodiment, a first thermo detector 6 is provided on a side of the target position along the direct rolling traction direction, and the method for obtaining the target temperature of the target position includes:
acquiring a preset acquisition period of the first thermometer 6; measuring the target position according to a preset acquisition period to obtain a current measurement result; and obtaining the current temperature according to the current measurement result.
Specifically, the preset collection period may be determined according to the rated frequency of the output temperature of the first thermo detector 6, or may be freely set according to the actually required measurement period and the direct rolling traction speed of the current rolled piece, for example, the preset collection period may be preset to be 0.2s, 0.5s or 1s. And measuring the temperature of the target position according to a preset acquisition period to obtain a current measurement result, namely the current temperature. When the measured current measurement result deviates due to the surrounding environment factors, the current measurement result may be multiplied by a correction coefficient to obtain an accurate target temperature, and the step S13 is performed after the current temperature is obtained.
S13, judging whether the current temperature is greater than the target temperature.
Specifically, if the current temperature is not greater than the target temperature, the target position is indicated not to be cooled by a cooler; if the current temperature is higher than the target temperature, the target position is required to be cooled by a cooler, and the cooling treatment meets the finish rolling requirement of entering the direct rolling process. It will be appreciated by those skilled in the art that in a cooler, a cooling section and a constant temperature section are typically included, and the current temperature is not higher than the target temperature, and the cooling section is not used for cooling, but the constant temperature section is used for meeting the requirements of the finish rolling process.
And S14, if yes, controlling the cooler to cool the target position to the target temperature.
Specifically, the cooling target position is controlled to a target temperature, which can be determined according to the type of the cooler, for example, in a water-cooled cooler, the control of the amount of cooling water sprayed to the target position can be controlled. When the temperature difference between the current temperature and the target temperature is large, large-flow spraying is adopted; when the temperature difference between the current temperature and the target temperature is smaller, the current temperature of the target position can be cooled to the target temperature by adopting small-flow spraying.
In practical application, due to certain fluctuation of the current temperature, the flow of sprayed cooling water cannot be automatically and accurately controlled when the current rolled piece is cooled by adopting a water cooling cooler.
In a specific embodiment, the cooler is a water-cooled cooler, and a flow valve 7 for controlling cooling temperature is arranged on the water-cooled cooler; controlling the chiller to cool the target location to the target temperature, comprising:
acquiring a cooling water quantity curve of a water-cooling cooler; obtaining a target cooling temperature of the current rolled piece according to the current temperature and the target temperature; and controlling the flow valve to be opened to a target opening degree cooling target position according to the cooling water volume curve and the target cooling temperature.
Specifically, the cooling water volume curve is a fitting relation curve of cooling water flow and corresponding cooling temperature, the flow valve 7 can be a servo valve, the flow valve 7 performs closed-loop control according to the cooling water volume curve, the target cooling temperature is a temperature difference value between the current temperature and the target temperature, after the target cooling temperature is calculated, the opening of the flow valve can be further calculated through the cooling water volume curve, the flow valve 7 is controlled to be opened to the target opening, and the cooling water with corresponding flow can be sprayed out, so that the current temperature of the target position is cooled to the target temperature.
In order to further improve the accuracy of the cooling target position, a second thermometer 5 is further arranged at the inlet position of the finishing mill 3; preferably, the second thermometer 5 is disposed at the outlet position of the cooler 2. And after the cooler is controlled to cool the target position to the target temperature, acquiring the current measured temperature of the target position through the second thermometer 5, and if the current measured temperature is greater than the target temperature, correspondingly correcting the current opening of the flow valve, namely controlling the current opening of the flow valve to be larger so as to accurately cool the target position which is pulled subsequently to the target temperature. By arranging the second thermometer 5, the corresponding correction of the opening of the flow valve can be realized, and the accuracy of temperature control is further improved.
When rolling pieces of different specifications are cooled specifically, if the cooling water quantity curve of the rolling pieces of the same specification is adopted, the cooling effect is poor and the target temperature cannot be reached.
In a specific embodiment, obtaining a cooling water volume curve of the water-cooled chiller includes:
acquiring the cooling temperature of the current rolled piece and the valve opening of a corresponding flow valve; and obtaining a cooling water quantity curve according to the fitting relation of the cooling temperature and the valve opening.
Specifically, the current rolled piece has corresponding specification and size, so that the cooling temperature of the rolled piece with different specifications and the valve opening of the flow valve have corresponding fitting relations, and the cooling water volume curve of the current rolled piece can be calculated through the fitting relations. The flow valve can be controlled to be opened to the target opening degree through the cooling water volume curve so as to spray the cooling water with the corresponding flow rate, and the accurate cooling of the target position of the current rolled piece is realized.
In the concrete implementation, the control of the opening degree of the flow valve is completed through the servo motor, the valve core and the valve body of the flow valve under the drive of different control information, and the flow valve is continuously regulated to be easy to be damaged due to mechanical fatigue because the current temperature possibly fluctuates in the direct rolling process.
In a specific embodiment, controlling the flow valve to open to a target opening degree cooling target position according to the cooling water amount curve and the target cooling temperature includes:
acquiring a temperature dividing threshold value; dividing a cooling water quantity curve according to a temperature dividing threshold value to obtain a plurality of cooling temperature intervals; correspondingly obtaining flow opening of a flow valve according to a plurality of cooling temperature intervals, wherein one cooling temperature interval corresponds to one flow opening; and controlling the flow valve to be opened to a corresponding flow opening degree cooling target position according to the target cooling temperature.
Specifically, the temperature dividing threshold value can be freely set according to dividing experience of technicians, and can also be divided by cooling temperature corresponding to the opening of the flow valve, wherein the cooling temperature interval can meet the rolling temperature requirement of the direct rolling process, and the temperature dividing threshold value can be 6 ℃, 8 ℃ or 12 ℃. One temperature cooling interval corresponds to one flow opening, after the target cooling temperature is obtained, the corresponding temperature cooling interval is known, the flow valve is controlled to be opened to the corresponding flow opening, the target position is cooled to the target temperature at a constant flow, the frequent action of the flow valve can be reduced while the temperature requirement of the direct rolling process is met, and further the early damage caused by excessive adjustment of the flow valve is reduced. It can be understood that the smaller the temperature division threshold value is, the more accurate the cooling temperature control is, but the higher the action frequency of the flow valve is; the greater the temperature division threshold value is, the less accurate the cooling temperature is controlled, but the action frequency of the flow valve is correspondingly reduced. In order to achieve the effect of controlling the cooling temperature and achieving the longest service life of the flow valve, repeated experiments prove that the temperature dividing threshold value can be set to be 10 ℃. Taking 14mm HRB400 steel bar as an example, the fluctuation of the current temperature of the rolled piece before cooling is 930-990 ℃, and the target temperature is 930-940 ℃. The temperature of 930-940 ℃, 940-950 ℃, 950-960 ℃, 960-970 ℃ and 980-990 ℃ are respectively used as temperature cooling intervals, one temperature cooling interval corresponds to one flow opening, and the redundancy of calculated data in the control process is reduced while the accurate control of cooling temperature and the service life of a flow valve are ensured.
In a specific embodiment, after controlling the cooler to cool the target location to the target temperature, the method further comprises:
acquiring the current specification of the current rolled piece; obtaining cooling parameters for controlling the cooler to cool the current rolled piece; and obtaining the standard cooling process of the current rolled piece according to the corresponding storage cooling parameters of the current specification.
Specifically, in order to ensure production efficiency and production sequence, in the direct rolling equipment, a plurality of specifications of direct rolling fixation of the direct rolling equipment are generally defined. The cooling parameters are data of cooling temperature and control of all opening degrees of corresponding flow valves in the whole direct rolling process from the head to the tail of the rolled piece, the standard cooling process of the current rolled piece can be obtained through corresponding storage of the cooling parameters of the current specification, and when the rolled piece of the current specification is directly rolled again, the standard cooling process can be directly called to control a cooler to cool the rolled piece. The deviation between the inlet temperature and the target temperature of the finishing mill can be corrected during the secondary direct rolling, and the standard cooling process is continuously perfected.
In the following, with reference to fig. 3, an overall explanation will be given of how to implement the method for controlling the temperature of a rolled piece according to the present invention, wherein a fitting curve of the inlet temperature of a finishing mill and the cooling water amount is established, and the target temperature of the inlet of the finishing mill is set; and calculating the cooling temperature through the difference between the outlet temperature of the intermediate rolling mill (or called a pre-finishing mill) and the target temperature. If the cooling temperature is less than zero, the cooling water quantity of the cooler is not adjusted and controlled; if the cooling temperature is greater than zero, taking the difference value of 10 ℃ as a step, correspondingly adjusting the opening of the flow valve to adjust the flow of cooling water, further measuring the temperature of the rolled piece at the inlet of the finishing mill through a second thermometer, and correcting the opening of the flow valve after comparing the temperature with the target temperature until the cooled rolled piece can reach the target temperature. And finally, suggesting stepped cooling control models of all specifications according to the data of the cooling control of the rolled piece so as to perform cooling control on the rolled piece with the same next specification.
After the temperature control method of the rolled piece is implemented, the temperature of the rolled piece entering the finishing mill is more stable and balanced, taking 14 mm-specification HRB400 steel bar rolling as an example, referring to fig. 4-6, the abscissa in the drawing is the time of a direct rolling line, the speed of the direct rolling line can be set to 20m/s, the temperature of the head part, the middle part and the tail part of the rolled piece entering the finishing mill can be kept within 30s after the direct rolling line runs, the temperature of the head part, the middle part and the tail part of the rolled piece entering the finishing mill is kept between 930 ℃ and 940 ℃, the whole tensile strength is kept above 630MPa, and the yield strength is kept above 450 MPa. When the temperature control method of the rolled piece is not implemented, the temperature change, the tensile strength and the yield strength of the rolled piece with the specification are shown in figures 7-9, the temperature of the head part of the rolled piece meets the target temperature, 933 ℃, the temperature of the tail part of the rolled piece reaches 990 ℃ due to the lag of the crystallizer, the tensile strength and the yield strength of the rolled piece are not uniformly distributed as a whole after the rolled piece is rolled by a finishing mill, and particularly, the mechanical properties of the tail part of the rolled piece are attenuated compared with those of the head part of the rolled piece.
After comprehensive comparison, the mechanical properties of the head, the middle and the tail of the rolled piece tend to be balanced and the mechanical properties of the head of the front rolled piece are nearly improved by adopting the temperature balance control method for the rolled piece. The lowest tensile strength is 621MPa, which is increased to 629MPa and is higher than 89MPa of national standard; the minimum value of the yield strength is 422MPa, which is increased to 448MPa and is higher than 48MPa of national standard. The temperature control method reduces the fluctuation of the mechanical properties of the rolled piece, eliminates the problem of low mechanical properties of the middle part and the tail part of the rolled piece, and creates conditions for reducing the alloy cost and increasing the economic benefit. Taking the specification of 12-16mm of a high-rod production line as an example, the V content of the alloy component is reduced by 0.008 percent, and the economic benefit can be increased by 20 yuan per ton according to the price of the vanadium-nitrogen alloy.
Based on the same inventive concept as the control method, the embodiment of the invention also provides a device for controlling the temperature of a rolled piece, referring to fig. 10, the device is applied to a direct rolling device, the direct rolling device comprises a middle rolling mill, a cooler and a finishing mill which are sequentially arranged along the direct rolling traction direction of the rolled piece, and the device comprises:
a first obtaining module 101, configured to obtain a target temperature of a current rolled piece entering the finishing mill;
a second obtaining module 102, configured to obtain a current temperature of the current rolled piece at a target position, where the target position is a position of the current rolled piece between the middle rolling mill and the cooler during a direct rolling traction process;
a determining module 103, configured to determine whether the current temperature is greater than the target temperature;
and the control module 104 is used for controlling the cooler to cool the target position to the target temperature when the current temperature is greater than the target temperature.
In an alternative embodiment, the cooler is a water-cooled cooler, and a flow valve for controlling cooling temperature is arranged on the water-cooled cooler; the control module comprises:
the first acquisition submodule is used for acquiring a cooling water quantity curve of the water-cooling cooler;
the first obtaining submodule is used for obtaining the target cooling temperature of the current rolled piece according to the current temperature and the target temperature;
and the first control submodule is used for controlling the flow valve to be opened to a target opening degree to cool the target position according to the cooling water volume curve and the target cooling temperature.
In an alternative embodiment, the first acquisition sub-module includes:
the first acquisition unit is used for acquiring the cooling temperature of the current rolled piece and the valve opening corresponding to the flow valve;
the first obtaining unit is used for obtaining the cooling water volume curve according to the fitting relation between the cooling temperature and the valve opening.
In an alternative embodiment, the first control sub-module includes:
a second acquisition unit configured to acquire a temperature division threshold;
the second obtaining unit is used for dividing the cooling water quantity curve according to the temperature dividing threshold value to obtain a plurality of cooling temperature intervals;
a third obtaining unit, configured to correspondingly obtain flow opening degrees of the flow valves according to a plurality of cooling temperature intervals, where one cooling temperature interval corresponds to one flow opening degree;
and the control unit is used for controlling the flow valve to be opened to the corresponding flow opening degree to cool the target position according to the target cooling temperature.
In an alternative embodiment, a first thermo detector is disposed on a side surface of the target position along the direct rolling traction direction, and the second acquisition module includes:
the second acquisition sub-module is used for acquiring a preset acquisition period of the first thermometer;
the second obtaining submodule is used for measuring the target position according to the preset acquisition period and obtaining a current measurement result;
and a third obtaining sub-module, configured to obtain the current temperature according to the current measurement result.
In an alternative embodiment, the control device further comprises:
the third acquisition module is used for acquiring the current specification of the current rolled piece;
a fourth obtaining module, configured to obtain a cooling parameter for controlling the cooler to cool the current rolled piece;
and the obtaining module is used for correspondingly storing the cooling parameters according to the current specification and obtaining the standard cooling process of the current rolled piece.
Based on the same inventive concept as the control method, an embodiment of the invention further provides an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions which, when executed by the processor, cause the electronic device to perform the steps of any one of the control methods.
Based on the same inventive concept as the control method, the embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the steps of any one of the control methods.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
1. the control method is applied to the direct rolling equipment, when the rolled piece sequentially passes through the direct rolling equipment of the intermediate rolling mill, the cooler and the finishing mill, the current temperature of the position between the intermediate rolling mill and the cooler of the current rolled piece is obtained by obtaining the target temperature of the rolled piece entering the finishing mill, and when the current temperature is higher than the target temperature, the cooler is controlled to cool the target position to the target temperature, so that all parts of the rolled piece can be accurately cooled to the target temperature before entering the finishing mill, the temperature uniformity of the rolled piece in the direct rolling process is improved, and the rolling quality of the rolled piece in the direct rolling process is further improved.
2. If the control method of the temperature and the water quantity is not adopted, the flow valve of the cooler can infinitely carry out opening and closing adjustment actions along with the current temperature change of the target position of the rolled piece, the service life of the electric original piece and the valve is seriously influenced, and the continuous and stable use of the cooler cannot be ensured.
3. The invention can save alloy cost, when the cooling control method is not adopted, the mechanical properties of the middle part and the tail part of the rolled piece are low, and the mechanical properties of the head part are higher.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A method for controlling the temperature of a rolled piece, the method being applied to a direct rolling apparatus including a middle rolling mill, a cooler, and a finishing mill disposed in this order in a direct rolling traction direction of the rolled piece, the method comprising:
obtaining a target temperature of a current rolled piece entering the finishing mill;
acquiring the current temperature of the current rolled piece at a target position, wherein the target position is the position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process;
judging whether the current temperature is greater than the target temperature;
if yes, controlling the cooler to cool the target position to the target temperature, so that all parts in the length direction of the rolled piece can be accurately cooled to the target temperature before entering a finishing mill;
the side of the target position along the direct rolling traction direction is provided with a first thermometer, and the current temperature of the current rolled piece at the target position is obtained, and the method comprises the following steps:
acquiring a preset acquisition period of the first thermometer;
measuring the target position according to the preset acquisition period to obtain a current measurement result;
judging whether the current measurement result has deviation due to the surrounding environment;
if yes, multiplying the current measurement result by a preset correction coefficient to obtain the current temperature;
if not, the current temperature is obtained according to the current measurement result;
the cooler is a water-cooling cooler, and a flow valve for controlling cooling temperature is arranged on the water-cooling cooler; the controlling the chiller to cool the target location to the target temperature includes:
obtaining a cooling water quantity curve of the water-cooling cooler, wherein the cooling water quantity curve is a fitting relation curve of cooling water flow and corresponding cooling temperature;
obtaining a target cooling temperature of the current rolled piece according to the current temperature and the target temperature;
controlling the flow valve to be opened to a target opening degree to cool the target position according to the cooling water volume curve and the target cooling temperature;
and controlling the flow valve to be opened to a target opening degree to cool the target position according to the cooling water volume curve and the target cooling temperature, including:
acquiring a temperature dividing threshold value;
dividing the cooling water quantity curve according to the temperature dividing threshold value to obtain a plurality of cooling temperature intervals;
correspondingly obtaining flow opening degrees of the flow valves according to a plurality of cooling temperature intervals, wherein one cooling temperature interval corresponds to one flow opening degree so as to consider cooling temperature and service life control of the flow valves;
controlling the flow valve to be opened to the corresponding flow opening degree to cool the target position according to the target cooling temperature;
after the controlling the cooler to cool the target position to the target temperature, further comprising:
acquiring the current specification of the current rolled piece;
obtaining cooling parameters for controlling the cooler to cool the current rolled piece;
and storing the cooling parameters according to the current specification correspondence to obtain a standard cooling process of the current rolled piece.
2. The method of claim 1, wherein said obtaining a cooling water quantity profile of said water cooler comprises:
acquiring the cooling temperature of the current rolled piece and the valve opening corresponding to the flow valve;
and obtaining the cooling water quantity curve according to the fitting relation between the cooling temperature and the opening of the valve.
3. A method of controlling the temperature of a rolled stock according to claim 1, wherein the temperature division threshold is 10 ℃.
4. A device for controlling the temperature of a rolled piece, which is a device corresponding to the method of any one of claims 1 to 3, and is applied to a direct rolling device, wherein the direct rolling device comprises a middle rolling mill, a cooler and a finishing mill which are sequentially arranged along the direct rolling traction direction of the rolled piece, and the device comprises:
the first acquisition module is used for acquiring the target temperature of the current rolled piece entering the finishing mill;
the second acquisition module is used for acquiring the current temperature of the current rolled piece at a target position, wherein the target position is a position of the current rolled piece between the middle rolling mill and the cooler in the direct rolling traction process;
the judging module is used for judging whether the current temperature is greater than the target temperature or not;
and the control module is used for controlling the cooler to cool the target position to the target temperature when the current temperature is greater than the target temperature.
5. An electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of claims 1-3.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-3.
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