CN115323162B - Overaging control method, device, equipment and storage medium - Google Patents
Overaging control method, device, equipment and storage medium Download PDFInfo
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- CN115323162B CN115323162B CN202210842749.5A CN202210842749A CN115323162B CN 115323162 B CN115323162 B CN 115323162B CN 202210842749 A CN202210842749 A CN 202210842749A CN 115323162 B CN115323162 B CN 115323162B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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Abstract
The embodiment of the invention provides an overaging control method, device, equipment and storage medium. And determining the total length and the total number of passes of overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold, and determining the overaging treatment time corresponding to the strip steel with different thickness specifications based on the total length of overaging and the preset performance parameters of the annealing furnace. Because the different thickness specifications comprise preset thickness specifications, the critical overaging treatment time length corresponding to the strip steel with the preset thickness specifications can be utilized to determine the critical pass number from the total pass number, and the critical thickness specification of the strip steel is determined based on the critical pass number. Finally, the actual temperature in the annealing furnace can be controlled based on the critical thickness specification, so that different temperature control is implemented on the strip steel with different thickness specifications, and further, the time difference of overaging treatment between the strip steel with different thickness specifications can be reduced, and the heat treatment performance between the strip steel with different thickness specifications is reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an overaging control method, an overaging control device, overaging control equipment and an overaging control storage medium.
Background
The cold rolling vertical annealing furnace is mainly used for carrying out annealing treatment on the acid rolling hard coil, so that the performance of the rolling hard coil can reach the preset requirement, and the subsequent deep processing can be realized. The conventional annealing furnace sequentially comprises the working procedures of preheating, heating, soaking, cooling, overaging, final cooling, water quenching and the like.
For the overaging process, the main process control points include the overaging temperature and the overaging treatment duration. Due to the influence of heating and cooling capacity and inlet and outlet production periods, the overaging treatment time length of the strip steel with the same steel grade and different specifications is different. The concrete steps are as follows: the transmission speed of the thin strip steel is high, the overaging treatment time is short, and the strength is generally higher; the conveying speed of the thick strip steel is low, the overaging treatment time is long, and the strength is generally low.
Therefore, when the prior vertical annealing furnace is used for processing the strip steel with different specifications of the same steel grade, the problem of inconsistent performance of the strip steel with different specifications of the same steel grade exists due to overlarge time length difference of overaging treatment.
Disclosure of Invention
The embodiment of the invention solves the technical problems of large time length difference and inconsistent strip steel performance of the traditional annealing furnace when annealing the strip steel with different specifications of the same steel grade by providing the overaging control method, the device, the equipment and the storage medium.
In a first aspect, the present invention provides, by an embodiment of the present invention, an overaging control method applied to an annealing furnace, the method comprising: determining the total length and the total number of passes of overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold; determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the total length of overaging and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications; determining a critical pass number from the total pass number by utilizing the critical overaging treatment time length corresponding to the strip steel with the preset thickness specification, and determining the critical thickness specification of the strip steel based on the critical pass number; and controlling the actual temperature in the annealing furnace based on the critical thickness specification.
Preferably, the determining the total length of overaging and the total number of passes based on the rated transmission speed of the annealing furnace and the overaging time threshold includes: determining the total length of the overaging based on the product of the rated transmission speed and the overaging time threshold; and determining the total number of passes based on the total length of overaging and the pass length of the annealing furnace.
Preferably, the overaging includes multiple sections, and determining overaging treatment time lengths corresponding to the strip steel with different thickness specifications based on the total length of the overaging and preset performance parameters of the annealing furnace includes: and determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the ratio of the length of the multi-section overaging to the preset performance parameter of the annealing furnace.
Preferably, the determining the critical number of passes from the total number of passes by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel includes: judging whether the critical overaging treatment time length is greater than the overaging time length threshold value; if yes, the number of the passes corresponding to the critical overaging treatment duration is matched from the total number of the passes, so that the critical number of the passes is determined.
Preferably, the determining the critical thickness specification of the strip steel based on the critical pass number includes: and determining the critical thickness specification of the strip steel based on the overaging time threshold, the preset performance parameters of the annealing furnace, the critical pass number and the total pass number.
Preferably, the method further comprises: and determining the installation position of the pyrometer in the annealing furnace by using the critical pass number.
Preferably, said determining the installation position of the pyrometer in said annealing furnace using said critical number of passes comprises: judging whether the critical pass number meets a preset reference condition or not; if so, determining the downstream of the overaging as the installation location of the pyrometer; otherwise, determining a mounting position of the pyrometer based on the preset reference condition.
In a second aspect, the present invention provides, by an embodiment of the present invention, an overaging control apparatus for an annealing furnace, the apparatus comprising:
the first calculation unit is used for determining the total length and the total number of passes of overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold;
the second calculation unit is used for determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the total length of overaging and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications;
the critical condition determining unit is used for determining the critical number of passes from the total number of passes by utilizing the critical overaging treatment time length corresponding to the strip steel with the preset thickness specification, and determining the critical thickness specification of the strip steel based on the critical number of passes;
and the temperature control unit is used for controlling the actual temperature in the annealing furnace based on the critical thickness specification.
In a third aspect, the invention provides, by an embodiment of the invention, an overaging control apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any of the embodiments of the first aspect when executing the program.
In a fourth aspect, the present invention provides, by way of example of the present invention, a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements any of the embodiments of the first aspect.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
firstly, determining the total length and the total number of passes of overaging based on the rated transmission speed of an annealing furnace and an overaging time threshold, and then determining overaging treatment time lengths corresponding to strip steel with different thickness specifications based on the total length of overaging and preset performance parameters of the annealing furnace. Because the different thickness specifications comprise preset thickness specifications, the critical overaging treatment time length corresponding to the strip steel with the preset thickness specifications can be utilized to determine the critical pass number from the total pass number, and the critical thickness specification of the strip steel is determined based on the critical pass number. Finally, the actual temperature in the annealing furnace can be controlled based on the critical thickness specification, so that different temperature control is implemented on the strip steel with different thickness specifications, and further, the time difference of overaging treatment between the strip steel with different thickness specifications can be reduced, and the heat treatment performance between the strip steel with different thickness specifications is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, 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 an overaging control method in an embodiment of the invention;
FIG. 2 is a schematic diagram showing the relationship between the overaging treatment time and the thickness of strip steel in the embodiment of the invention;
FIG. 3 is a schematic view of an annealing furnace pyrometer arrangement in an embodiment of the present invention;
FIG. 4 is a schematic diagram of the duration of the overaging treatment corresponding to different thickness specifications of steel strip of the same steel grade under overaging control according to the embodiment of the present invention;
FIG. 5 is a schematic illustration of a prior art lehr pyrometer arrangement;
FIG. 6 is a schematic diagram of the duration of an overaging treatment corresponding to steel strips of different thickness specifications of the same steel grade under the overaging control of the prior art;
FIG. 7 is a schematic diagram of an annealing furnace pyrometer arrangement for use in a first critical pass number of the present invention;
FIG. 8 is a schematic view of the duration of the corresponding overaging treatment when the annealing furnace shown in FIG. 7 is used for heat treatment of steel strips of different thickness specifications of the same steel grade;
FIG. 9 is a schematic diagram of an annealing furnace pyrometer arrangement at a second critical pass number in accordance with an embodiment of the present invention;
FIG. 10 is a schematic view of the duration of the corresponding overaging treatment when the annealing furnace shown in FIG. 9 is used for heat treatment of steel strips of different thickness specifications of the same steel grade;
FIG. 11 is a schematic illustration of an annealing furnace pyrometer setup at a third critical pass number in accordance with an embodiment of the present invention;
FIG. 12 is a schematic view of the duration of the corresponding overaging treatment when heat treating steel strips of different thickness specifications of the same steel grade in the annealing furnace shown in FIG. 11;
FIG. 13 is a schematic view of an overaging control device in accordance with an embodiment of the present invention;
FIG. 14 is a schematic view of an overaging control device in accordance with an embodiment of the present invention;
fig. 15 is a schematic diagram of a computer-readable storage medium structure in an embodiment of the present invention.
Detailed Description
The embodiment of the invention solves the technical problems of large time length difference and inconsistent strip steel performance of the traditional annealing furnace when annealing the strip steel with different specifications of the same steel grade by providing the overaging control method, the device, the equipment and the storage medium.
The technical scheme provided by the embodiment of the invention aims to solve the technical problems, and the overall thought is as follows:
firstly, determining the total length and the total number of passes of overaging based on the rated transmission speed of an annealing furnace and an overaging time threshold, and then determining overaging treatment time lengths corresponding to strip steel with different thickness specifications based on the total length of overaging and preset performance parameters of the annealing furnace.
Because the different thickness specifications comprise preset thickness specifications, the critical overaging treatment time length corresponding to the strip steel with the preset thickness specifications can be utilized to determine the critical pass number from the total pass number, and the critical thickness specification of the strip steel is determined based on the critical pass number. Finally, the actual temperature in the annealing furnace can be controlled based on the critical thickness specification.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be capable of operation in sequences other than those illustrated or otherwise described.
In a first aspect, the present invention provides an overaging control method, which can be applied to an annealing furnace to control overaging process stages of the annealing furnace, and reduce overaging time differences between strip steels of different specifications, so as to improve heat treatment performance differences between strip steels of different specifications. The annealing furnace may specifically be a vertical annealing furnace, for example, a cold-rolling vertical annealing furnace.
Referring to fig. 1, the above-mentioned overaging control method may include the following steps S101 to S104:
step S101: and determining the total length of overaging and the total number of passes based on the rated transmission speed of the annealing furnace and the overaging time threshold.
Specifically, the total length of the overaging may be determined based on the product of the nominal transmission speed and the overaging time period threshold.
In a specific implementation process, the rated transmission speed of the annealing furnace is generally determined by transmission hardware of the annealing furnace, and the rated transmission speed of the annealing furnace can be controlled according to actual needs, and in one implementation mode, the rated transmission speed can be the maximum design speed of the annealing furnace. The overaging time period threshold may be the shortest overaging time period allowed for the overaging stage.
In some embodiments, the total length of the overaging may be calculated using the following equation (1):
L OAS ＝V max ·t min (1)
wherein L is OAS For overageing total length, V max For the rated transmission speed of the annealing furnace, t min Is an overaging duration threshold.
After the total length of the overaging is obtained, the total number of passes may be determined, in particular, based on the total length of the overaging and the pass length of the annealing furnace.
In a specific implementation process, the pass length of the annealing furnace may be the pass length of the overaging process section, and in some embodiments, the total number of passes may be calculated using the following formula (2):
wherein N is the total number of overaging passes, L OAS Is overagedIs the total length of L 0 Is the pass length of the annealing furnace.
Step S102: and determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the total overaging length and preset performance parameters of the annealing furnace.
In particular, the overaging includes multiple segments, and in particular implementations, the overaging may include: overaging 1 section and overaging 2 section.
The method comprises the steps of determining the overaging treatment time lengths corresponding to the strip steel with different thickness specifications according to the total length of overaging and the preset performance parameters of an annealing furnace, and specifically determining the overaging treatment time lengths corresponding to the strip steel with different thickness specifications according to the ratio of the lengths of multiple sections of overaging to the preset performance parameters of the annealing furnace.
The length of the overaging 1 section can be obtained based on the number of passes in the overaging 1 section, and specifically, the length of the overaging 1 section can be determined based on the product of the number of passes in the overaging 1 section and the length of the annealing furnace pass. Similarly, the length of the overaging 2 section can also be determined based on the product of the number of passes in the overaging 2 section and the annealing furnace pass length, and the length of the overaging 2 section can be obtained by using the difference between the total length of overaging and the length of the overaging 1 section.
In some embodiments, the length of the overaging 1 segment can be calculated using the following equation (3):
L OAS1―i ＝i·L 0 (3)
wherein L is OAS1―i For the length of the overaging 1 section, i is the number of passes of the overaging 1 section, L 0 Is the pass length of the annealing furnace.
In some embodiments, the length of the overaging 2 segment may be calculated using equation (4) as follows:
L OAS2―i ＝(N―i)·L 0 (4)
wherein L is OAS2―i For the length of the overaging 2 sections, i is the number of passes of the overaging 1 section, L 0 And N is the total number of passes for the length of the passes of the annealing furnace.
After the length of the multiple sections of overaging is determined, the ratio of the length of the overaging 1 section to the preset performance parameters of the annealing furnace can be utilized to obtain the overaging treatment time lengths corresponding to the strip steel with different thickness specifications. In some embodiments, the overaging treatment duration corresponding to the strip steel with different thickness specifications can be calculated by using the following formula (5):
t i ＝60 ·b· L OAS1―i /TV (5)
wherein t is i Is the overaging treatment time length when the thickness specification is b and the number of passes is i, L OAS1―i For the length of the overageing 1 section, TV is the product of the reference thickness strip and the highest process speed allowed when the annealing furnace processes the reference thickness strip.
That is to say, the length of the overaging treatment corresponding to the steel strips with different specifications is in direct proportion to the thickness of the steel strips, as shown in fig. 2.
The preset thickness specification is included in the different thickness specifications, and specifically, the preset thickness specification can be the maximum strip steel thickness allowed by the annealing furnace.
Therefore, the overaging treatment time length corresponding to the strip steel with the maximum thickness can be calculated based on the calculated overaging treatment time lengths corresponding to the strip steel with different thickness specifications, so that the critical overaging treatment time length is determined.
Step S103: and determining the critical pass number from the total pass number by utilizing the critical overaging treatment time length corresponding to the strip steel with the preset thickness specification, and determining the critical thickness specification of the strip steel based on the critical pass number.
Specifically, the critical pass number may be determined by determining whether the critical overaging time period is greater than an overaging time period threshold. And if the critical overaging treatment time length is larger than the overaging time length threshold, matching the number of passes corresponding to the critical overaging treatment time length from the total number of passes to determine the critical number of passes.
Based on step S102, the critical overaging time period may be calculated, that is, as long as the critical overaging time period satisfies the following inequality (6), the number of passes corresponding to the critical overaging time period may be determined as the critical number of passes.
t i―max ＞t min (6)
In the inequality, t i―max Is of thickness specification b max Critical overaging treatment time length when the number of the passes is i, and t i―max ＝60·b max ·L OAS1―i A/TV. Wherein b max As a preset thickness specification of the strip steel, if the critical pass number is k, k=i.
And then, determining the critical thickness specification of the strip steel based on the critical pass number, and specifically, determining the critical thickness specification of the strip steel based on an overaging time threshold, a preset performance parameter of an annealing furnace, the critical pass number and the total pass number.
In the specific implementation process, the critical thickness specification of the strip steel can be obtained based on the product of the overaging time length threshold and the preset performance parameter of the annealing furnace, the pass length of the annealing furnace and the difference value of the total pass number and the critical pass number.
In some embodiments, the critical thickness specification of the strip may be calculated using the following equation (7):
b k ＝TV · t min /60 · ( N ― k ) · L 0 (7)
wherein b is k Is the critical thickness specification of the strip steel, TV is the product of the strip steel with the reference thickness and the highest process speed allowed by the annealing furnace for processing the strip steel with the reference thickness, and t min For the overaging time threshold, N is the total number of passes, k is the critical number of passes, L 0 Is the pass length of the annealing furnace.
Step S104: the actual temperature in the lehr is controlled based on the critical thickness specification.
Specifically, if the thickness of the current strip steel is greater than or equal to the critical thickness specification, the front end of the overaging section 2 is controlled to cool the current strip steel, and the tail end of the overaging section 2 and the final cooling section downstream of the overaging process are controlled not to regulate the temperature of the current strip steel.
Otherwise, controlling the front end and the tail end of the overaging 2 section, carrying out heat preservation control on the current strip steel, and controlling the final cooling section downstream of the overaging process to cool the current strip steel.
In the specific implementation, as shown in FIG. 3, a radiation pyrometer P may be added at a specific location of the overaging 2 stage 2 Thereby dividing the overaging 2 section into two parts, namely the overaging 2 section front end and the overaging 2 section end. In addition, cooling equipment can be arranged at the front end of the overaging 2 section, so that the front end of the overaging 2 section has cooling capacity, and the temperature of the strip steel can be reduced to below 200 ℃.
For example, if a certain annealing furnace is capable of heat treating a strip steel with a thickness specification ranging from 0.4 to 2.5mm, the total overaging length of the annealing furnace is 200m, the TV value of the annealing furnace is 80mm·m/min (the reference thickness is 1.0, the annealing temperature is 760 ℃), the overaging time period threshold is 150s, and the maximum time period allowed for overaging treatment is 210s.
When the annealing temperature of the strip steel is 760 ℃, the overaging treatment time of the strip steel with different thickness specifications is shown as figure 4, and the corresponding overaging treatment time is controlled to be within 150s to 292.5s along with the increase of the thickness of the strip steel.
In contrast, as shown in FIG. 5, the prior art is to provide a pyrometer at the outlet of each zone of the lehr, wherein P 0 The high-temperature gauge is used for measuring the temperature of the strip steel before entering the overaging process; p (P) 1 P for a pyrometer at the outlet of overageing section 1 3 The pyrometers at the outlet of the 2 sections of overaging treatment are used for measuring the temperature in the overaging treatment process of the strip steel, but the overaging treatment time length of the strip steel with different specifications is inconsistent because the transmission speed of the thin strip steel is higher than that of the thick strip steel.
For example, if a strip steel having a thickness in the range of 0.4 to 2.5mm can be heat treated in an annealing furnace having an overaging total length of 200m, a TV value of 80mm·m/min (reference thickness of 1.0, annealing temperature of 760 ℃) and an overaging time period threshold of 150s, the maximum time period allowed for overaging treatment being 210s, for example.
When the annealing temperature of the strip steel is 760 ℃, the overaging treatment time periods of the strip steel with different thickness specifications are shown in fig. 6, and as the thickness of the strip steel increases, the corresponding overaging treatment time period gradually increases from 150s to 370s, exceeds the longest time period allowed by the overaging treatment, and overflows 160s.
In summary, compared with the over-aging control mode of the existing annealing furnace, the embodiment of the invention can effectively reduce the difference of the over-aging time periods when over-aging treatment is performed on the strip steel with different thickness specifications of the same steel grade, and based on the enumerated data, the maximum difference of the over-aging time periods in the prior art is 220s, while in the implementation of the invention, the maximum difference of the over-aging time periods is only 142.5s.
In order to better determine the installation position of the pyrometer, in particular, the installation position of the pyrometer can be determined in the annealing furnace by means of the critical number of passes.
In the specific implementation process, the pyrometer installation position can be determined by judging whether the critical pass number meets the preset reference condition. If so, determining the downstream of the overaging as the installation position of the pyrometer; otherwise, determining the installation position of the pyrometer based on the preset reference condition.
The preset reference conditions may include: whether the critical number of passes is greater than or equal to the number of passes of the finish cooling stage. In some embodiments, the following inequality (8) may be used to determine whether the critical number of passes meets a preset reference condition:
N―k≤ CRF· N fcs (8)
wherein N is the total number of overaging passes, k is the critical number of passes, N fcs The number of passes of the final cooling section; CRF is the ratio of the single pass cooling rate of the final cooling stage to the single pass cooling rate of the front end of the overaging 2 stage, and in some embodiments CRF may be any value from 0.5 to 2.
It should be noted that if the above inequality (8) is true, a high radiation pyrometer may be provided at the outlet of the overaging 2 section; if it is as aboveInequality (8) is not true, then a high radiation pyrometer may be set at the second stage of overaging 2 CRF· N fcs At the exit of each pass.
The following is exemplified by the fact that the annealing furnace can be used for carrying out heat treatment on the strip steel with the thickness specification range of 0.4-2.5 mm, the single-pass length of the annealing furnace is 20m, the TV value of the annealing furnace is 100mm m/min (the reference thickness is 1.0, the annealing temperature is 760 ℃), the overaging time length threshold is 150s, and the maximum time length allowed by overaging treatment is 210 s:
according to the above step S101, the total length of overaging is 250m and the total number of passes is 13. Then, the overaging is divided into two sections, namely an overaging 1 section and an overaging 2 section, wherein the lengths of the overaging 1 section are respectively 260m, 240m, 220m, 200m, 180m, 160m, 140m, 120m and 100m, and according to the step S102, the overaging treatment duration of the steel strips with different thickness specifications of the same steel grade can be obtained as shown in the following table 1:
TABLE 1 overaging treatment time of corresponding strip steel with different thickness specifications under different overaging 1-section lengths
The overaging 1 stage lengths capable of satisfying the above inequality (6) in Table 1 were 140m and 120m; from the above formula (7), it can be seen that:
1. when the critical pass number is 7, the critical thickness specification of the strip steel is 1.80mm, namely when the thickness of the strip steel is more than or equal to 1.80mm, as shown in FIG. 7, the radiation pipe pyrometer P at the outlet of the overaging section 1 1 Radiant tube pyrometer P for overaging heat preservation at outlet of front end of overaging 2 sections 2 Radiant tube pyrometer P for cooling strip steel at end outlet of overaging 2 sections 3 Radiation pyrometer P at the outlet of the final cooling section 4 Not engaged in the beltAnd controlling the temperature of steel.
When the width of the strip steel is less than 1.8mm, all radiation pyrometers P in the overaging section 1 、P 2 、P 3 Radiation pyrometer P for overaging heat preservation and final cooling section outlet 4 The cooling device is used for cooling the strip steel. In this manner of overaging control, the maximum value of the difference in overaging treatment duration between the strip steels of different thickness specifications is 121.8s, wherein the overaging treatment duration of the strip steel of 1.4-1.74 mm thickness specification exceeds the longest duration allowed by overaging treatment, and the overflow value is 63s, as shown in fig. 8.
2. When the critical pass number is 6, the critical thickness specification of the strip steel is 1.80mm, namely when the width of the strip steel is more than or equal to 1.80mm, as shown in FIG. 9, the radiation pipe pyrometer P at the outlet of the overaging section 1 1 The radiation pipe pyrometer at the outlet of the front end of the overaging 2 section is used for cooling strip steel, and the radiation pipe pyrometer P at the outlet of the tail end of the overaging 2 section 3 Radiation pyrometer P at the outlet of the final cooling section 4 Does not participate in the temperature control of the strip steel.
When the width of the strip steel is less than 1.8mm, all radiation pyrometers P in the overaging section 1 、P 2 、P 3 Radiation pyrometer P for overaging heat preservation and final cooling section outlet 4 The cooling device is used for cooling the strip steel. In this manner of overaging control, as shown in fig. 10, the maximum difference between the overaging time lengths between the strip steels of different thickness specifications is 168.6s, wherein the overaging time length of the strip steel of 1.4-2.05 mm thickness specification exceeds the longest time length allowed by the overaging treatment, and the overflow value is 109.8s.
3. Based on the first and second conditions, 3 pyrometers can be configured in the overaging 2 section, the specific arrangement mode is shown in fig. 11, by setting the pyrometers in this way and according to the overaging control mode, the difference of overaging treatment duration between strip steel with different thickness specifications can be further reduced, as shown in fig. 12, the maximum difference can be controlled within 59.4s, and all thickness specifications do not exceed the longest duration allowed by overaging treatment.
In a second aspect, the present invention provides an overaging control device, which can be applied to an annealing furnace to control overaging process stages of the annealing furnace, and reduce overaging time differences between strip steels of different specifications, so as to improve heat treatment performance differences between strip steels of different specifications. The annealing furnace may specifically be a vertical annealing furnace, for example, a cold-rolling vertical annealing furnace.
Referring to fig. 13, the apparatus may include:
the first calculation unit 201 is configured to determine the total length of overaging and the total number of passes based on the rated transmission speed of the annealing furnace and the overaging duration threshold.
The second calculating unit 202 is configured to determine an overaging treatment duration corresponding to the strip steel with different thickness specifications based on the total length of overaging and a preset performance parameter of the annealing furnace, where the different thickness specifications include a preset thickness specification.
The critical condition determining unit 203 is configured to determine the critical number of passes from the total number of passes by using a critical overaging treatment duration corresponding to the preset thickness specification strip steel, and determine the critical thickness specification of the strip steel based on the critical number of passes.
And a temperature control unit 204 for controlling the actual temperature in the annealing furnace based on the critical thickness specification.
As an alternative embodiment, the first computing unit 201 is specifically configured to:
determining the total length of overaging based on the product of the rated transmission speed and the overaging time threshold; and determining the total number of passes based on the total length of overaging and the pass length of the annealing furnace.
As an alternative embodiment, the overaging comprises a plurality of segments, the second calculation unit 202 being specifically adapted to:
and determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the ratio of the length of the multiple overaging sections to the preset performance parameters of the annealing furnace.
As an alternative embodiment, the critical condition determining unit 203 includes:
the judging subunit is used for judging whether the critical overaging treatment time length is greater than an overaging time length threshold value; if yes, the number of passes corresponding to the critical overaging treatment duration is matched from the total number of passes, so that the critical number of passes is determined;
the critical thickness specification determining subunit is used for determining the critical thickness specification of the strip steel based on the overaging time threshold, the preset performance parameter of the annealing furnace, the critical pass number and the total pass number.
As an alternative embodiment, the overaging control device further comprises:
and the pyrometer position determining unit is used for determining the installation position of the pyrometer in the annealing furnace by using the critical pass number.
As an alternative embodiment, the pyrometer position determining unit is specifically configured to:
judging whether the critical pass number meets a preset reference condition or not; if so, determining the downstream of the overaging as the installation position of the pyrometer; otherwise, determining the installation position of the pyrometer based on the preset reference condition.
Since the overaging control device described in this embodiment is an electronic device for implementing the overaging control method in this embodiment, based on the overaging control method described in this embodiment, those skilled in the art can understand the specific implementation of the electronic device in this embodiment and various modifications thereof, so how this electronic device implements the method in this embodiment will not be described in detail herein. Any electronic device used by those skilled in the art to implement the overaging control method in the embodiments of the present invention falls within the scope of the present invention.
In a third aspect, based on the same inventive concept, the embodiment of the invention provides an overaging control device which can be applied to an annealing furnace to control overaging process stages of the annealing furnace, so that overaging treatment time difference between strip steel with different specifications is reduced, and heat treatment performance difference between strip steel with different specifications is improved. The annealing furnace may specifically be a vertical annealing furnace, for example, a cold-rolling vertical annealing furnace.
Referring to fig. 14, an overaging control apparatus provided in an embodiment of the present invention includes: memory 301, processor 302, and code stored on the memory and executable on processor 302, processor 302 implementing any of the embodiments of the overage control methods described above when the code is executed.
Where in FIG. 14, a bus architecture (represented by bus 300), bus 300 may comprise any number of interconnected buses and bridges, with bus 300 linking together various circuits, including one or more processors, represented by processor 302, and a memory, represented by memory 301. Bus 300 may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be described further herein. Bus interface 305 provides an interface between bus 300 and receiver 303 and transmitter 304. The receiver 303 and the transmitter 304 may be the same element, i.e. a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The processor 303 is responsible for managing the bus 300 and general processing, while the memory 301 may be used to store data used by the processor 302 in performing operations.
In a fourth aspect, as shown in fig. 15, based on the same inventive concept, the present invention provides, by way of an embodiment of the present invention, a computer-readable storage medium 400 having stored thereon a computer program 401, which program 401, when executed by a processor, implements any of the embodiments of the overaging control method described above.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the embodiment of the invention, the actual temperature in the annealing furnace can be controlled based on the critical thickness specification, so that different temperature control is implemented on the strip steel with different thickness specifications, and further, the time difference of overaging treatment between the strip steel with different thickness specifications can be reduced, and the heat treatment performance between the strip steel with different thickness specifications is reduced.
It will be appreciated by those skilled in the art that embodiments of the invention may be provided as a method, system, or computer 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 invention may take the form of a computer 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 code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer 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 instructions. These computer instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, 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 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 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. An overaging control method, characterized by being applied to an annealing furnace, comprising:
based on the rated transmission speed of the annealing furnace and the overaging time threshold, determining the total length of overaging and the total number of passes, including: determining the total length of the overaging based on the product of the rated transmission speed and the overaging time threshold; the total number of passes is calculated using the following formula:
wherein N is the total number of overaging passes, L OAS For the total length of the overaging, L 0 The pass length of the annealing furnace is;
determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the total length of overaging and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications;
the overaging includes: overaging 1 section and overaging 2 section; the length of the overageing 1 section is calculated using the following formula:
L OAS1-i ＝i·L 0
wherein L is OAS1-i I is the number of passes of the overaging 1 section, L 0 The pass length of the annealing furnace;
the length of the overageing 2 section is calculated using the following formula:
L OAS2-i ＝(N-i)·L 0
wherein L is OAS2-i I is the number of passes of the overaging 1 section, L, which is the length of the overaging 2 section 0 N is the total number of passes for the pass length of the annealing furnace;
and calculating the overaging treatment time lengths corresponding to the strip steel with different thickness specifications by using the following formula:
t i ＝60·b·L OAS1-i /TV
wherein t is i Is the overaging treatment time length when the thickness specification is b and the number of passes is i, L OAS1-i For the length of the overaging 1 section, TV is the product of the reference thickness strip steel and the highest process speed allowed by the annealing furnace when the reference thickness strip steel is processed;
determining a critical pass number from the total pass number by utilizing the critical overaging treatment time length corresponding to the strip steel with the preset thickness specification, and determining the critical thickness specification of the strip steel based on the critical pass number;
if the critical overaging treatment duration satisfies the following inequality, the number of passes corresponding to the critical overaging treatment duration may be determined as the critical number of passes:
t i-max >t min
in the inequality, t i-max Is of thickness specification b max Critical overaging treatment time length when the number of the passes is i, and t i-max ＝60·b max ·L OAS1-i a/TV; wherein b max As for the preset thickness specification of the strip steel, if the critical pass number is k, k=i;
the critical thickness specification of the strip steel is calculated by the following formula:
b k ＝TV·t min /60·(N-k)·L 0
wherein b is k For the critical thickness specification of the strip steel, TV is used for processing the strip steel with the reference thickness by the strip steel with the reference thickness and the annealing furnaceProduct of highest process speed allowed at time, t min For the overaging time threshold, N is the total number of passes, k is the critical number of passes, L 0 The pass length of the annealing furnace is;
and controlling the actual temperature in the annealing furnace based on the critical thickness specification.
2. The method as recited in claim 1, further comprising:
and determining the installation position of the pyrometer in the annealing furnace by using the critical pass number.
3. The method of claim 2, wherein said determining the installation location of the pyrometer in the lehr using the critical number of passes comprises:
judging whether the critical pass number meets a preset reference condition or not;
if so, determining the downstream of the overaging as the installation location of the pyrometer;
otherwise, determining a mounting position of the pyrometer based on the preset reference condition.
4. An overaging control device for an annealing furnace, the device comprising:
the first calculation unit is used for determining the total length and the total number of passes of overaging based on the rated transmission speed of the annealing furnace and the overaging time length threshold, and comprises the following steps: determining the total length of the overaging based on the product of the rated transmission speed and the overaging time threshold; the total number of passes is calculated using the following formula:
wherein N is the total number of overaging passes, L OAS For the total length of the overaging, L 0 To be the instituteThe pass length of the annealing furnace;
the second calculation unit is used for determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the total length of overaging and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications;
the overaging includes: overaging 1 section and overaging 2 section; the length of the overageing 1 section is calculated using the following formula:
L OAS1-i ＝i·L 0
wherein L is OAS1-i I is the number of passes of the overaging 1 section, L 0 The pass length of the annealing furnace;
the length of the overageing 2 section is calculated using the following formula:
L OAS2-i ＝(N-i)·L 0
wherein L is OAS2-i I is the number of passes of the overaging 1 section, L, which is the length of the overaging 2 section 0 N is the total number of passes for the pass length of the annealing furnace;
and calculating the overaging treatment time lengths corresponding to the strip steel with different thickness specifications by using the following formula:
t i ＝60·b·L OAS1-i /TV
wherein t is i Is the overaging treatment time length when the thickness specification is b and the number of passes is i, L OAS1-i For the length of the overaging 1 section, TV is the product of the reference thickness strip steel and the highest process speed allowed by the annealing furnace when the reference thickness strip steel is processed;
the critical condition determining unit is used for determining the critical number of passes from the total number of passes by utilizing the critical overaging treatment time length corresponding to the strip steel with the preset thickness specification, and determining the critical thickness specification of the strip steel based on the critical number of passes;
if the critical overaging treatment duration satisfies the following inequality, the number of passes corresponding to the critical overaging treatment duration may be determined as the critical number of passes:
t i-max ＞t min
in the inequality, t i-max Is of thickness specification b max Critical overaging treatment time length when the number of the passes is i, and t i-max ＝60·b max ·L 0AS1-i a/TV; wherein b max As for the preset thickness specification of the strip steel, if the critical pass number is k, k=i;
the critical thickness specification of the strip steel is calculated by the following formula:
b k ＝TV·t min /60·(N-k)·L 0
wherein b is k For the critical thickness specification of the strip, TV is the product of the strip with the reference thickness and the highest process speed allowed by the annealing furnace for processing the strip with the reference thickness, t min For the overaging time threshold, N is the total number of passes, k is the critical number of passes, L 0 The pass length of the annealing furnace is;
and the temperature control unit is used for controlling the actual temperature in the annealing furnace based on the critical thickness specification.
5. An overaging control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1-3 when executing the program.
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 method of any of claims 1-3.
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