CN115323162A - Overaging control method, apparatus, device and storage medium - Google Patents
Overaging control method, apparatus, device and storage medium Download PDFInfo
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- CN115323162A CN115323162A CN202210842749.5A CN202210842749A CN115323162A CN 115323162 A CN115323162 A CN 115323162A CN 202210842749 A CN202210842749 A CN 202210842749A CN 115323162 A CN115323162 A CN 115323162A
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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 and equipment and a storage medium. And determining the total length and the total track number 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 different thickness specifications comprise the preset thickness specification, the critical pass number can be determined from the total pass number by using the critical overaging treatment duration corresponding to the strip steel with the preset thickness specification, and the critical thickness specification of the strip steel can be 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 can be performed on the band steels with different thickness specifications, the time difference of overaging treatment between the band steels with different thickness specifications can be reduced, and the heat treatment performance between the band steels with different thickness specifications can be reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an overaging control method, device, equipment and storage medium.
Background
The cold rolling vertical annealing furnace mainly carries out annealing treatment on acid rolling hard coils, so that the performance of the hard coils reaches the preset requirement, and the subsequent deep processing is facilitated. 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 capacities and production cycles of an inlet and an outlet, the over-aging treatment time lengths of the strip steels of the same steel grade and different specifications are different. The concrete expression is as follows: the transmission speed of the thin-specification strip steel is high, the overaging treatment time is short, and the strength is generally high; the transmission speed of thick-specification strip steel is low, the overaging treatment time is long, and the strength is generally low.
Therefore, when the current vertical annealing furnace is used for processing the strip steels with the same steel type and different specifications, the problems of overlarge time difference of overaging treatment and inconsistent performance of the strip steels with the same steel type and different specifications exist.
Disclosure of Invention
The embodiment of the invention provides an overaging control method, device, equipment and storage medium, and solves the technical problems that the prior annealing furnace has large difference of overaging time and inconsistent performance of strip steel when the prior annealing furnace is used for annealing the strip steel with the same steel type and different specifications.
In a first aspect, the present invention provides an overaging control method applied to an annealing furnace, according to an embodiment of the present invention, the method including: determining the total length and total track number 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 overaging total length and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications; determining the number of critical passes from the total pass number by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel, and determining the critical thickness specification of the strip steel based on the critical pass number; controlling an actual temperature in the annealing furnace based on the critical thickness specification.
Preferably, the determining the total length and the total track number of the overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold comprises: determining the overaging total length based on the product of the rated transmission speed and the overaging duration threshold; and determining the total track number based on the total length of the overaging and the track length of the annealing furnace.
Preferably, the overaging comprises a plurality of sections, and the determining of the overaging treatment time length corresponding to the strip steels with different thickness specifications based on the total length of the overaging and the preset performance parameters of the annealing furnace comprises: and determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the ratio of the lengths of the multiple sections of overaging to the preset performance parameters of the annealing furnace.
Preferably, the determining the critical pass number from the total pass number 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; and if so, 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.
Preferably, the determining the critical thickness specification of the strip based on the critical pass number includes: and determining the critical thickness specification of the strip steel based on the overaging time length 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, the determining the mounting position of the pyrometer in the annealing furnace by using the critical number of passes includes: judging whether the critical pass number meets a preset reference condition or not; if so, determining the downstream of the overaging as the mounting position of the pyrometer; otherwise, determining the mounting position of the pyrometer based on the preset reference condition.
In a second aspect, the present invention provides an overaging control apparatus for an annealing furnace, according to an embodiment of the present invention, the apparatus including:
the first calculating unit is used for determining the total length and the total track number of the overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold;
the second calculating unit is used for determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the overaging total length 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 pass number from the total pass number by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel, and determining the critical thickness specification of the strip steel based on the critical pass number;
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 present invention provides an overaging control device according to an embodiment of the present invention, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements any one of the implementation manners of the first aspect when executing the program.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements any of the embodiments of the first aspect.
One or more technical schemes provided in the embodiments of the present invention have at least the following technical effects or advantages:
the method comprises the steps of firstly determining the total length and the total track number of overaging based on the rated transmission speed of an annealing furnace and an overaging time threshold, and then determining the overaging treatment time corresponding to different thickness specifications of strip steel based on the total length of overaging and preset performance parameters of the annealing furnace. Because different thickness specifications comprise the preset thickness specification, the critical pass number can be determined from the total pass number by using the critical overaging treatment duration corresponding to the strip steel with the preset thickness specification, and the critical thickness specification of the strip steel can be 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 can be performed on the band steels with different thickness specifications, the time difference of overaging treatment between the band steels with different thickness specifications can be reduced, and the heat treatment performance between the band steels with different thickness specifications can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of an overaging control method in an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the overaging time and the thickness of the 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 over-aging treatment duration corresponding to different thickness specifications of the same steel type under the over-aging control of the embodiment of the invention;
FIG. 5 is a schematic view of a prior art lehr pyrometer arrangement;
FIG. 6 is a schematic diagram showing the time length of overaging treatment corresponding to different thickness specifications of steel strips of the same steel type under overaging control in the prior art;
FIG. 7 is a schematic diagram of an annealing furnace pyrometer arrangement for a first critical number of passes in accordance with the practice of the invention;
FIG. 8 is a schematic view of the annealing furnace shown in FIG. 7, which is used for performing heat treatment on steel strips with different thickness specifications of the same steel type, and the corresponding overaging treatment duration;
FIG. 9 is a schematic view of an annealing furnace pyrometer arrangement for a second critical number of passes according to an embodiment of the present invention;
FIG. 10 is a schematic view of the annealing furnace shown in FIG. 9, which is used for performing heat treatment on steel strips with different thickness specifications of the same steel type and corresponding overaging treatment duration;
FIG. 11 is a schematic diagram of an annealing furnace pyrometer arrangement at a third critical pass number according to an embodiment of the present invention;
FIG. 12 is a schematic view of the annealing furnace shown in FIG. 11, which is used for performing heat treatment on steel strips with different thickness specifications of the same steel type and corresponding overaging treatment duration;
FIG. 13 is a schematic diagram of the configuration of an overaging control device in accordance with an embodiment of the present invention;
FIG. 14 is a schematic diagram of the configuration of an overaging control device in an embodiment of the present invention;
fig. 15 is a schematic diagram of a structure of a computer-readable storage medium in an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an overaging control method, device, equipment and storage medium, and solves the technical problems that the prior annealing furnace has large difference of overaging time and inconsistent performance of strip steel when the prior annealing furnace is used for annealing the strip steel with the same steel type and different specifications.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the method comprises the steps of firstly determining the total length and the total track number of overaging based on the rated transmission speed of an annealing furnace and an overaging time threshold, and then determining the overaging treatment time corresponding to different thickness specifications of strip steel based on the total length of overaging and preset performance parameters of the annealing furnace.
Because different thickness specifications comprise the preset thickness specification, the critical pass number can be determined from the total pass number by using the critical overaging treatment duration corresponding to the strip steel with the preset thickness specification, and the critical thickness specification of the strip steel can be 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 technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.
In a first aspect, the present invention provides an overaging control method, which is applied to an annealing furnace, to control an overaging process stage of the annealing furnace, so as to reduce an overaging time difference between different specifications of strip steel, thereby improving a heat treatment performance difference between different specifications of strip steel. The annealing furnace may be in particular a vertical annealing furnace, for example a cold rolling vertical annealing furnace.
Referring to fig. 1, the overaging control method may include the following steps S101 to S104:
step S101: and determining the total length and total track number of the overaging according to the rated transmission speed of the annealing furnace and the overaging time length threshold.
Specifically, the overaged total length may be determined based on a product of the rated transmission speed and an overaging duration threshold.
In particular implementations, the nominal conveyance speed of the lehr is generally determined by the conveying hardware of the lehr, and can also be controlled according to actual needs. The overaging duration threshold may be the shortest overaging duration allowed for the overaging stage.
In some embodiments, the overaged total length can be calculated using the following equation (1):
L OAS ＝V max ·t min (1)
wherein L is OAS For the over-aged total length, V max Rated conveying speed, t, of the annealing furnace min Is an overaging duration threshold.
After the overaged total length is obtained, specifically, the total pass number can be determined based on the overaged total length and the pass length of the annealing furnace.
In particular implementations, the pass length of the annealing furnace can be the pass length of the overaging process stage, and in some implementations, the total pass number can be calculated using the following equation (2):
wherein N is the total track number of overaging, L OAS For the over-aged total length, 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 overaging total length and the preset performance parameters of the annealing furnace.
Specifically, the overaging includes multiple stages, and in a specific implementation process, the overaging may include: overaging stage 1 and overaging stage 2.
The overaging treatment duration corresponding to the strip steel with different thickness specifications is determined according to the overaging total length and the preset performance parameters of the annealing furnace, and specifically, the overaging treatment duration corresponding to the strip steel with different thickness specifications can be determined according to the ratio of the lengths of the 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 pass of the annealing furnace. 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 length of the annealing furnace passes, and of course, the length of the overaging 2 section can also be obtained by using the difference between the total length of the overaging and the length of the overaging 1 section.
In some embodiments, the length of the overaging 1 stage can be calculated using the following equation (3):
L OAS1―i ＝i·L 0 (3)
in the formula, L OAS1―i Is the length of the over-aged 1 stage, i is the number of passes of the over-aged 1 stage, L 0 Is the pass length of the annealing furnace.
In some embodiments, the length of the overaged 2 stage can be calculated using the following equation (4):
L OAS2―i ＝(N―i)·L 0 (4)
in the formula, L OAS2―i Is the length of the over-aging 2 section, i is the number of passes of the over-aging 1 section, L 0 The pass length of the annealing furnace is shown, and N is the total pass number.
After the lengths of the multiple sections of overaging are determined, the overaging treatment time duration corresponding to the strip steel with different thickness specifications can be obtained by utilizing the ratio of the length of the overaging section 1 to the preset performance parameter of the annealing furnace. In some embodiments, the overaging time periods corresponding to the steel strips with different thickness specifications can be calculated by using the following formula (5):
t i ＝60 ·b· L OAS1―i /TV (5)
in the formula, t i The overaging treatment time is the time length L when the thickness specification is b and the number of passes is i OAS1―i For the length of the over-aged 1 section, TV is the product of the reference thickness strip and the maximum process speed allowed by the annealing furnace when processing the reference thickness strip.
That is to say, the corresponding overaging time of the strip steel with the same steel type and different specifications is in direct proportion to the thickness of the strip steel, as shown in fig. 2.
The different thickness specifications comprise preset thickness specifications, and specifically, the preset thickness specification can be the maximum strip steel thickness allowed by the annealing furnace.
Therefore, the overaging time corresponding to the strip steel with the maximum thickness can be calculated based on the calculated overaging time corresponding to the strip steel with different thickness specifications, and the critical overaging time can be determined.
Step S103: and determining the critical pass number from the total pass number by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel, 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 processing duration is greater than an overaging duration threshold. And if the critical overaging treatment time length is judged to be larger than the threshold value of the overaging time length, 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 duration may be calculated, that is, as long as the critical overaging time duration satisfies the following inequality (6), the number of passes corresponding to the critical overaging time duration may be determined as the number of adjacent passes.
t i―max ＞t min (6)
In the inequality, t i―max Is defined as a thickness specification of b max Critical overaging time when the number of passes is i, and t i―max ＝60·b max ·L OAS1―i and/TV. Wherein, b max And if the critical pass number is k, k = i.
Then, the critical thickness specification of the strip steel can be determined based on the critical pass number, and specifically, the critical thickness specification of the strip steel can be determined based on the overaging time threshold, the preset performance parameters of the 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 parameters of the annealing furnace, the pass length of the annealing furnace and the difference value between the total pass number and the critical pass number.
In some embodiments, the critical thickness specification of the strip steel can be calculated using the following equation (7):
b k ＝TV · t min /60 · ( N ― k ) · L 0 (7)
in the formula, b k For the critical thickness specification of the strip, TV is the product of the reference thickness of the strip and the maximum process speed allowed by the annealing furnace for processing the reference thickness of the strip, t min Is an overaging time length threshold, N is the total track number, k is the critical track number, L 0 Is the pass length of the annealing furnace.
Step S104: the actual temperature in the annealing furnace is controlled based on the critical thickness specification.
Specifically, if the thickness of the current strip steel is larger 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, the front end and the tail end of the overaging 2 section are controlled, the heat preservation control is carried out on the current strip steel, and the final cooling section at the downstream of the overaging process is controlled to cool the current strip steel.
In practice, as shown in FIG. 3, a radiation pyrometer P may be added at a specific location in the overaging 2 stage 2 Thus, the overaging 2 stage is divided into two parts, namely the front end of the overaging 2 stage and the tail end of the overaging 2 stage. In addition, cooling equipment can be arranged at the front end of the overaging stage 2, so that the front end of the overaging stage 2 has cooling capacity, and the temperature of the strip steel can be reduced to be below 200 ℃.
For example, if an annealing furnace capable of heat-treating a strip having a thickness specification in the range of 0.4 to 2.5mm has an overaging total length of 200m, a TV value of 80mm · m/min (reference thickness 1.0, annealing temperature 760 ℃), an overaging time threshold of 150s, and a maximum permitted overaging time of 210s.
Then, when the annealing temperature of the strip is 760 ℃, the overaging time periods of the strip steels with different thickness specifications are shown in fig. 4, and it can be seen that the corresponding overaging time periods are controlled within 150s to 292.5s as the thickness of the strip steel increases.
In contrast, as shown in FIG. 5,it is known to provide a pyrometer at the exit of each zone of the annealing furnace, where P 0 The pyrometer is arranged at an inlet of the overaging 1 section and is used for measuring the temperature of the strip steel before the strip steel enters the overaging; p 1 For pyrometers at the outlet of the overaging stage 1, P 3 The pyrometers at the outlets of the overaging sections 2 are all used for measuring the temperature in the process of overaging the strip steel, but the transmission speed of the thin strip steel is higher than that of the thick strip steel, so the overaging treatment time of the strip steel with the same steel type and different specifications is inconsistent.
For example, if a strip steel having a thickness specification range of 0.4 to 2.5mm can be heat-treated by an annealing furnace having an overaging total length of 200m, a TV value of 80mm · m/min (reference thickness is 1.0, annealing temperature is 760 ℃), an overaging time threshold value of 150s, and a maximum permitted overaging time of 210s, the annealing furnace is exemplified.
When the annealing temperature of the strip is 760 ℃, the overaging treatment time of the strip with different thickness specifications is shown in fig. 6, and it can be seen that as the thickness of the strip increases, the corresponding overaging treatment time is gradually increased from 150s to 370s, exceeds the maximum time allowed by the overaging treatment, and overflows for 160s.
In summary, compared with the overaging control mode of the conventional annealing furnace, the embodiment of the invention can effectively reduce the difference of the overaging time periods when the overaging treatment is performed on the strip steel with the same steel type and different thickness specifications, and based on the listed data, the maximum difference of the overaging time periods in the prior art is 220s, while in the implementation of the invention, the maximum difference of the overaging time periods is only 142.5s.
In order to better determine the mounting position of the pyrometer, in particular, the mounting position of the pyrometer can be determined in the annealing furnace by using the critical number of passes.
In a specific implementation, the pyrometer installation location may be determined by determining whether the critical pass number satisfies a predetermined reference condition. If so, determining the downstream of overaging as the mounting position of the pyrometer; otherwise, the mounting position of the pyrometer is determined based on the preset reference condition.
Wherein, the preset reference condition may include: whether the critical pass number is greater than or equal to the pass number of the final cooling section. In some embodiments, the following inequality (8) may be used to determine whether the critical pass number satisfies the 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, and N is fcs The number of the passes of the final cooling section; CRF is the ratio of the single-pass cooling rate of the final cooling section to the single-pass cooling rate of the front end of the overaging 2 section, and in some embodiments 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 located at the exit of the overaging 2 stage; if the above inequality (8) does not hold, the high radiation pyrometer may be placed at the second stage of the overaging 2 CRF· N fcs At the exit of each pass.
The following examples are given to further illustrate the present invention by way of example, in which a strip having a thickness specification in the range of 0.4 to 2.5mm is heat treated using an annealing furnace having a single pass length of 20m, a TV value of 100mm · m/min (reference thickness 1.0, annealing temperature 760 ℃), an overaging time threshold of 150s, and a maximum time allowed for overaging of 210 s:
according to the step S101, the total length of the overaging is 250m, and the total track number is 13. Next, 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 260m, 240m, 220m, 200m, 180m, 160m, 140m, 120m and 100m, respectively, and the overaging treatment time of the strip steel with the same steel type and different thickness specifications can be obtained according to the step S102 as shown in the following table 1:
TABLE 1. Overaging treatment duration of different thickness specification strip steels corresponding to different overaging 1 segment lengths
In Table 1, the lengths of the over-aged 1 sections which can satisfy the above inequality (6) are 140m and 120m; according to the above formula (7):
1. when the critical pass number is 7, the critical thickness specification of the strip steel is 1.80mm, that is, when the thickness of the strip steel is more than or equal to 1.80mm, as shown in fig. 7, the radiant tube pyrometer P at the outlet of the overaging 1 section 1 Radiation tube pyrometer P for overaging heat preservation, overaging 2 section front end outlet 2 A radiant tube pyrometer P for cooling strip steel and overaging 2 sections at the end exit 3 And a radiation pyrometer P at the outlet of the final cooling stage 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 insulation, at the outlet of the final cooling section 4 Used for cooling the strip steel. In this overaging control mode, correspondingly, as shown in fig. 8, the maximum difference of the overaging time periods between the steel strips with different thickness specifications is 121.8s, wherein the overaging time period of the steel strips with the thickness specifications of 1.4-1.74 mm exceeds the maximum time period allowed by the overaging treatment, and the overflow value is 63s.
2. When the critical pass number is 6 and the critical thickness specification of the strip steel is 1.80mm, that is, when the strip steel width is more than or equal to 1.80mm, as shown in FIG. 9, the radiant tube pyrometer P at the outlet of the overaging 1 section 1 The radiation tube pyrometer at the front outlet of the overaging 2 sections is used for cooling the strip steel, and the radiation tube pyrometer P at the tail outlet of the overaging 2 sections 3 And a 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 insulation, at the outlet of the final cooling section 4 The cooling device is used for cooling strip steel. In this overaging control mode, correspondingly, as shown in fig. 10, the maximum difference of the overaging time periods between the steel strips with different thickness specifications is 168.6s, wherein the overaging time period of the steel strips with the thickness specifications of 1.4-2.05 mm exceeds the maximum time period allowed by the overaging treatment, and the overflow value is 109.8s.
3. Based on the first and second cases, 3 pyrometers can be configured in the overaging stage 2, the specific arrangement is shown in fig. 11, the pyrometers are arranged in this way, and the overaging control mode is adopted, so that the difference of the overaging treatment time length between the strip steels with different thickness specifications can be further reduced, as shown in fig. 12, the maximum difference can be controlled within 59.4s, and all the thickness specifications do not exceed the maximum time length allowed by the overaging treatment.
In a second aspect, the invention provides an overaging control device, which can be applied to an annealing furnace to control an overaging process stage of the annealing furnace, so as to reduce the time difference of overaging treatment between different specifications of strip steel, thereby improving the difference of heat treatment performance between different specifications of strip steel. The annealing furnace may particularly 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 used for determining the total length and the total track number of overaging according to the rated transmission speed of the annealing furnace and the overaging time length threshold value.
And the second calculating unit 202 is configured to determine the overaging treatment duration corresponding to the strip steel with different thickness specifications based on the overaging total length and preset performance parameters of the annealing furnace, where the different thickness specifications include preset thickness specifications.
The critical condition determining unit 203 is configured to determine the critical pass number from the total pass number by using the critical overaging time corresponding to the preset thickness specification strip steel, and determine the critical thickness specification of the strip steel based on the critical pass number.
And a temperature control unit 204 for controlling the actual temperature in the annealing furnace based on the critical thickness specification.
As an optional implementation manner, the first computing unit 201 is specifically configured to:
determining the total length of the overaging based on the product of the rated transmission speed and the overaging time length threshold; and determining the total pass number based on the total length of the overaging and the pass length of the annealing furnace.
As an optional implementation manner, the overaging includes multiple stages, and the second calculating unit 202 is specifically configured 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 multistage overaging to the preset performance parameter 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 so, matching the number of passes corresponding to the critical overaging treatment duration from the total number of passes to determine the number of critical passes;
and the critical thickness specification determining subunit is used for determining the critical thickness specification of the strip steel based on the overaging time length threshold, the preset performance parameters of the annealing furnace, the critical pass number and the total pass number.
As an optional embodiment, the overaging control apparatus further includes:
and the pyrometer position determining unit is used for determining the mounting position of the pyrometer in the annealing furnace by using the critical pass number.
As an optional implementation manner, the pyrometer position determining unit is specifically configured to:
judging whether the critical pass number meets a preset reference condition or not; if yes, determining the downstream of overaging as the mounting position of the pyrometer; otherwise, the mounting position of the pyrometer is determined based on the preset reference condition.
Since the overaging control device described in this embodiment is an electronic device used for implementing the overaging control method in the embodiment of the present invention, based on the overaging control method described in the embodiment of the present invention, a person skilled in the art can understand a specific implementation of the electronic device in this embodiment and various variations thereof, and therefore, how to implement the method in the embodiment of the present invention in the electronic device is not described in detail here. As long as those skilled in the art implement the electronic device used in the method for controlling overaging according to the embodiment of the present invention, the electronic device is within the scope of the present invention.
In a third aspect, based on the same inventive concept, embodiments of the present invention provide an overaging control apparatus, which can be applied to an annealing furnace to control an overaging process stage of the annealing furnace, so as to reduce an overaging time difference between different specifications of strip steel, thereby improving a heat treatment performance difference between different specifications of strip steel. The annealing furnace may be in particular a vertical annealing furnace, for example a cold rolling vertical annealing furnace.
Referring to fig. 14, an overaging control apparatus according to an embodiment of the present invention includes: a memory 301, a processor 302 and code stored on the memory and executable on the processor 302, the processor 302 implementing any of the embodiments of the above overaging control method when executing the code.
Where in fig. 14, a bus architecture (represented by bus 300), bus 300 may include any number of interconnected buses and bridges, bus 300 linking together various circuits including one or more processors, represented by processor 302, and memory, represented by memory 301. The bus 300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 305 provides an interface between the bus 300 and the 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 for storing 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 a computer-readable storage medium 400 by an embodiment of the present invention, wherein a computer program 401 is stored thereon, and when the computer program 401 is executed by a processor, the computer program 401 implements any one of the foregoing over-aging control methods.
The technical scheme in the embodiment of the invention at least has the following technical effects or advantages:
the embodiment of the invention can control the actual temperature in the annealing furnace based on the critical thickness specification, realize different temperature control on the band steel with different thickness specifications, further reduce the time difference of the over-aging treatment between the band steel with different thickness specifications and reduce the heat treatment performance between the band steel with different thickness specifications.
As will be appreciated by one skilled in the art, embodiments of the present 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 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 code embodied therein.
The present invention has been 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An overaging control method, applied to an annealing furnace, comprising:
determining the total length and total track number 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 overaging total length and the preset performance parameters of the annealing furnace, wherein the different thickness specifications comprise preset thickness specifications;
determining the number of critical passes from the total pass number by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel, and determining the critical thickness specification of the strip steel based on the critical pass number;
controlling an actual temperature in the annealing furnace based on the critical thickness specification.
2. The method of claim 1, wherein determining the total length and total number of overages based on the nominal travel speed of the lehr and an overaging duration threshold comprises:
determining the total length of the overaging based on the product of the rated transmission speed and the overaging duration threshold;
and determining the total pass number based on the total length of the overaging and the pass length of the annealing furnace.
3. The method of claim 1, wherein the overaging comprises a plurality of stages, and the determining of the overaging treatment duration corresponding to different thickness specification strip steels based on the overaged total length and the preset performance parameters of the annealing furnace comprises:
and determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the ratio of the lengths of the multiple sections of overaging to the preset performance parameters of the annealing furnace.
4. The method of claim 1, wherein determining the critical number of passes from the total number of passes using the critical overaging time duration corresponding to the predetermined gauge strip comprises:
judging whether the critical overaging treatment time length is greater than the overaging time length threshold value;
and if so, 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.
5. The method of claim 1, wherein said determining a critical thickness specification for said strip based on said critical pass number comprises:
and determining the critical thickness specification of the strip steel based on the overaging time length threshold, the preset performance parameters of the annealing furnace, the critical pass number and the total pass number.
6. The method of claim 1, further comprising:
and determining the mounting position of the pyrometer in the annealing furnace by using the critical pass number.
7. The method of claim 6, wherein said determining a pyrometer mounting location in said annealing furnace using said critical pass number comprises:
judging whether the critical pass number meets a preset reference condition or not;
if so, determining the downstream of the overaging as the mounting position of the pyrometer;
otherwise, determining the installation position of the pyrometer based on the preset reference condition.
8. An overaging control device, characterized in that, applied to an annealing furnace, the device comprises:
the first calculating unit is used for determining the total length and the total track number of the overaging based on the rated transmission speed of the annealing furnace and the overaging time threshold;
the second calculating unit is used for determining the overaging treatment time length corresponding to the strip steel with different thickness specifications based on the overaging total length 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 pass number from the total pass number by using the critical overaging treatment duration corresponding to the preset thickness specification strip steel, and determining the critical thickness specification of the strip steel based on the critical pass number;
and the temperature control unit is used for controlling the actual temperature in the annealing furnace based on the critical thickness specification.
9. 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 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of any one of claims 1 to 7.
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