CN115354144A - Roller type quenching process operation parameter setting method based on case matching - Google Patents
Roller type quenching process operation parameter setting method based on case matching Download PDFInfo
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- 238000010791 quenching Methods 0.000 title claims abstract description 54
- 230000000171 quenching effect Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011112 process operation Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 90
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 230000007547 defect Effects 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 8
- 238000010311 roll-quenching process Methods 0.000 claims description 6
- 238000010606 normalization Methods 0.000 claims description 4
- 238000013507 mapping Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000002759 woven fabric Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C21D11/005—Process control or regulation for heat treatments for cooling
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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Abstract
The invention discloses a case matching-based method for setting operation parameters of a roller type quenching process, which relates to the technical field of intelligent evaluation and control. And then, taking the thickness, the width, the length and the production time of the steel plate as characteristic parameters, and calculating the weighted Euclidean distance between the cases in the case library and the current production situation. And finally, searching the most similar source case in the case library according to the Euclidean distance, and setting the operating parameters of the quenching machine corresponding to the source case as the operating parameters of the quenching machine under the current production condition. In actual production, a group of operating parameters continuously used for multiple times on a plate with the same specification is considered as a good case, and a case base is updated according to the good case; the trial and error cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the field of medium plate quenching production processes, relates to an intelligent evaluation and control technology, and particularly relates to a case matching-based method for setting operation parameters in a roller quenching process.
Background
The medium plate is a steel plate with the thickness within the range of 4mm-25mm, has high requirements on comprehensive performance and surface quality, is widely applied to industries such as engineering machinery, petrochemical industry and the like, and is one of extremely important steel varieties. With the continuous development of production technology, the market has higher and higher requirements on plate products. The quenching and tempering heat treatment process can improve the comprehensive properties of the plate such as strength, toughness, tissue uniformity, fatigue strength and the like, and is an essential important process in the production process of high-end plate products. Quenching is a main means for strengthening medium and heavy plates in the heat treatment process, a continuous roller type quenching machine utilizes water as a cooling medium, and when the plates pass through the quenching machine at a constant speed, the upper and lower cooling nozzles spray water on the surface of a high-temperature steel plate, so that the plates are rapidly cooled to generate martensite phase transformation, and the performance requirements of the plates are met.
The cooling strength in the quenching process is high, the cooling rate of the upper surface and the lower surface of the plate is difficult to control, the condition of uneven cooling is easy to occur, the temperature distribution in the steel plate is uneven, serious residual stress is generated, the steel plate is subjected to buckling deformation, and the dynamic service performance and production and use of subsequent materials are influenced. If the deformation degree is smaller, the shape of the plate can be improved through a subsequent straightening process, but the production period is prolonged; if the degree of deformation is relatively large, it is difficult to adjust the flatness of the plate by other means, and the plate is determined to be scrap.
In actual production, an operator on site sets the operating parameters (roll gap, roll speed, cooling water supply amount and cooling water ratio) of the quenching machine according to the raw material parameters of the steel plate, namely information such as steel grade and specification, by means of experience, so as to obtain a good plate shape. However, the types and specifications of the plates are various, and the manual experience parameter setting mode has strong subjectivity and experience corresponding to various operation parameter combinations, and has certain production hidden dangers. Therefore, the method for reasonably setting the operating parameters of the quenching machine improves the qualification rate of the plate shape, and has great significance for improving the production efficiency in the quenching production process and reducing the material waste;
for this purpose, a method for setting the operating parameters of the roller quenching process based on case matching is proposed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The method for setting the operation parameters of the roller quenching process based on case matching is based on the operation historical data of the quenching process, finds the raw material information and the operation parameters of the quenching machine corresponding to the manually recorded qualified plate shape, and constructs a case library. And then, taking the thickness, the width, the length and the production time of the steel plate as characteristic parameters, and calculating the weighted Euclidean distance between the cases in the case library and the current production situation. And finally, searching the most similar source case in the case library according to the Euclidean distance, and setting the operating parameters of the quenching machine corresponding to the source case as the operating parameters of the quenching machine under the current production condition. In actual production, a group of operating parameters which are continuously used for multiple times on the same specification of plates are considered as good cases, and the case base is updated according to the good cases; the trial and error cost is reduced, and the production efficiency is improved.
To achieve the above object, an embodiment according to a first aspect of the present invention proposes a case matching based roll quenching process operation parameter setting method, comprising the steps of:
the method comprises the following steps: collecting historical data of quenching process operation, and preprocessing the historical data to obtain sample data of a historical production steel plate;
step two: marking the shape of the steel plate in the sample data manually, and selecting the sample data marked as qualified to construct a case library in a unified manner;
step three: screening sample cases meeting the thickness condition of the current production cases from a case library; taking the thickness, the width, the length and the production time of the steel plate as characteristic parameters, carrying out normalization processing, and calculating the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case;
step four: screening 3 groups of source cases with the minimum weighted Euclidean distance from a case library, and setting the operating parameters of the quenching machine corresponding to the source cases as the operating parameters of the quenching machine under the current production condition;
step five: in actual production, a group of operating parameters continuously used for a plurality of times on a plate with the same specification is a good case, and the operating parameters are updated to a case library;
the sample data is production data with a shape result extracted manually, the sampling interval of the data is 5 seconds, and production process data of the steel plate at the beginning of quenching is selected as the sample data of the steel plate;
according to the manually measured defect types and the corresponding straightness of the quenched plate, marking the shape of the steel plate in the sample data as follows:
if the defect type is head warping or tail warping, and the unevenness is less than or equal to 4mm/m, the plate shape quality is qualified;
if the defect type is head warping or tail warping, and the unevenness is more than 4mm/m, the plate shape quality is unqualified;
if the defect type is other types and the unevenness is less than or equal to 5mm/m, the quality of the plate shape is qualified;
if the defect type is other types and the unevenness is more than 5mm/m, the plate shape quality is unqualified;
sample data marked as qualified in the case library comprises plate-shaped raw material parameters, state parameters and quenching machine operation parameters;
marking the thickness of the plate of the current production case as Tn, and marking the thickness of the plate of the sample case in the case library as Ts; wherein s represents a sample case; the thickness condition is 0.8 × Tn-woven fabric Ts-woven fabric 1.2 × Tn; screening sample cases meeting 0.8 × Tn & ltTs & lt 1.2 × Tn from a case library;
the normalization of thickness, width, length and production time is calculated using equation (1):
wherein, y is the normalized output, x is the input characteristic parameter, [ ymin, ymax ] is the mapping range, [ -1,1], (xmin, xmax) is the minimum and maximum of the input data set;
wherein, the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case is calculated by using a formula (2):
wherein ds is a weighted Euclidean distance between the current production case plate and the sample case, and a1, a2, a3 and a4 are preset weights of thickness, width, length and production time set according to actual experience; wn, ln and Tn are respectively the width, length and production time of the current production case plate, and Ws, ls and Ts are respectively the width, length and production time of the sample case s;
in a preferred embodiment, the step five of updating the case base includes the following steps:
step S1: defining a counter C =0;
step S2: in the production process, judging whether the current plate is consistent with the raw material information of the previous plate according to the information of the plate type, the specification thickness, the width, the length and the like of the steel plate; the judgment conditions are as follows:
gn and Gp are respectively the type of the plate of the current production case and the type of the previous plate; tp, wp and Lp are respectively the thickness, width and length of the previous plate;
and step S3: if the production condition changes, the counter C is set to zero; if the plate is not changed, further judging whether the operating parameters of the quenching machine used by the current plate are the same as the operating parameters of the quenching machine used by the previous plate; if the two are the same, the counter C is increased by one, otherwise, the counter C is set to zero; the production condition is changed, so that unqualified plates can appear in the produced plates;
and step S4: repeating the steps S2-S3; when C = k; the production condition can be considered to be stable, the plate shape of the quenched plate is good, the operating parameters of the quenching machine used have high reusability, namely the operating parameters can be used as a group of excellent cases, and the operating parameters of the quenching machine are newly added into a case library; and reset C to 0; where k is a counter threshold set based on practical experience.
Compared with the prior art, the invention has the beneficial effects that:
the invention finds the raw material information and the quenching machine operation parameters corresponding to the artificially recorded qualified plate shape based on the historical data of the quenching process operation, and constructs a case library. Then, taking the thickness, width, length and production time of the steel plate as characteristic parameters, and calculating the weighted Euclidean distance between the cases in the case library and the current production condition. And finally, searching the most similar source case in the case library according to the Euclidean distance, and setting the operating parameters of the quenching machine corresponding to the source case as the operating parameters of the quenching machine under the current production condition. In actual production, a group of operating parameters which are continuously used for multiple times on the same specification of plates are considered as good cases, and the case base is updated according to the good cases; the trial and error cost is reduced, and the production efficiency is improved.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for setting operation parameters of a roll quenching process based on case matching comprises the following steps:
the method comprises the following steps: collecting historical data of quenching process operation, and preprocessing the historical data to obtain sample data of a historical production steel plate;
step two: marking the shape of the steel plate in the sample data manually, and selecting the sample data marked as qualified to construct a case library in a unified manner;
step three: screening sample cases meeting the thickness condition of the current production cases from a case library; taking the thickness, the width, the length and the production time of the steel plate as characteristic parameters, carrying out normalization processing, and calculating the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case;
step four: screening 3 groups of source cases with the minimum weighted Euclidean distance from a case library, and setting the operating parameters of the quenching machine corresponding to the source cases as the operating parameters of the quenching machine under the current production condition;
step five: in actual production, a group of operating parameters continuously used for a plurality of times on a plate with the same specification is a good case, and the operating parameters are updated to a case library;
the sample data is production data with a shape result extracted manually, the sampling interval of the data is 5 seconds, and production process data of the steel plate at the beginning of quenching is selected as the sample data of the steel plate; the production data comprises plate type, steel plate thickness, steel plate width, steel plate length, steel plate temperature, i-th section of roll gap (i =1,2,3,4), roll speed, j-th group of nozzles, water feeding amount, water discharging amount, valve switching signals (j =1,2,3,4,5,6,7,8,9), plate shape and the like;
and marking the shape of the steel plate in the sample data according to the manually measured defect type and the corresponding straightness of the quenched plate as follows:
if the defect type is head warping or tail warping, and the unevenness is less than or equal to 4mm/m, the plate shape quality is qualified;
if the defect type is head warping or tail warping, and the unevenness is more than 4mm/m, the plate shape quality is unqualified;
if the defect type is other types and the unevenness is less than or equal to 5mm/m, the quality of the plate shape is qualified;
if the defect type is other types and the unevenness is more than 5mm/m, the plate shape quality is unqualified;
sample data marked as 'qualified' in the case base comprises plate-shaped raw material parameters, state parameters and quenching machine operation parameters;
marking the thickness of a current production case plate as Tn, and marking the thickness of a sample case plate in a case library as Ts; wherein s represents a sample case; the thickness condition is 0.8 × Tn-woven fabric Ts-woven fabric 1.2 × Tn; screening sample cases meeting 0.8 × Tn & lt Ts & lt 1.2 × Tn from a case library;
the method for normalizing the thickness, width, length and production time is calculated by using the formula (1):
wherein, y is the normalized output, x is the input characteristic parameter, [ ymin, ymax ] is the mapping range, [ -1,1], (xmin, xmax) is the minimum and maximum of the input data set;
wherein, the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case is calculated by using a formula (2):
wherein ds is a weighted Euclidean distance between the current production case plate and the sample case, and a1, a2, a3 and a4 are preset weights of thickness, width, length and production time set according to actual experience; wn, ln and Tn are respectively the width, length and production time of the current production case plate, and Ws, ls and Ts are respectively the width, length and production time of the sample case s;
in a preferred embodiment, the step five of updating the case base includes the following steps:
step S1: defining a counter C =0;
step S2: in the production process, judging whether the current plate is consistent with the raw material information of the previous plate or not according to the information of the plate type, the specification thickness, the width, the length and the like; the judgment conditions are as follows:
gn and Gp are respectively the type of the plate of the current production case and the type of the previous plate; tp, wp and Lp are the thickness, width and length of the previous plate respectively;
and step S3: if the production condition changes, the counter C is set to zero; if the current plate is not changed, further judging whether the operating parameters of the quenching machine used by the current plate are the same as the operating parameters of the quenching machine used by the previous plate; the operating parameters of the quenching machine comprise roll gap, roll speed, water quantity of an upper nozzle, water ratio and the like; if the two are the same, the counter C is increased by one, otherwise, the counter C is set to zero; the production condition changes, namely unqualified plates or plate types, plate thickness, plate width and plate length in the produced plates are changed;
and step S4: repeating the steps S2-S3; when C = k; the production condition is considered to be stable, the plate shape of the quenched plate is good, and the operating parameters of the quenching machine used have high reusability, namely the operating parameters can be used as a group of excellent cases, and the operating parameters of the quenching machine are newly added in a case library; and reset C to 0; wherein k is a counter threshold value set according to practical experience;
it can be understood that the case library and the newly added cases constructed by utilizing the actual operation data have high reproducibility and pass the test of actual production; in the subsequent production process, the existing case data is utilized to guide the setting of the operation parameters in the production; greatly promoting the production efficiency.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (6)
1. A roller quenching process operation parameter setting method based on case matching is characterized by comprising the following steps:
the method comprises the following steps: collecting historical data of quenching process operation, and preprocessing the historical data to obtain sample data of a historical production steel plate;
step two: marking the shape of the steel plate in the sample data manually, and selecting the sample data marked as qualified to construct a case library in a unified manner;
step three: screening sample cases meeting the thickness condition of the current production cases from a case library; taking the thickness, the width, the length and the production time of the steel plate as characteristic parameters, carrying out normalization processing, and calculating the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case;
step four: screening 3 groups of source cases with the minimum weighted Euclidean distance from a case library, and setting the operating parameters of the quenching machine corresponding to the source cases as the operating parameters of the quenching machine of the current production case;
step five: in actual production, a set of operating parameters used several times in succession on a sheet of the same specification is a good case, and the case library is updated.
2. The case matching-based roll quenching process operation parameter setting method according to claim 1, wherein the sample data is production data from which a strip shape result is manually extracted; the sampling interval of the data is 5 seconds, and the production process data of the steel plate at the beginning of quenching is selected as the sample data of the steel plate.
3. The case matching-based setting method for the operation parameters of the roller quenching process according to claim 1, wherein the plate shapes of the steel plates in the sample data are marked according to the manually measured defect types and the corresponding non-straightness of the quenched plates as follows:
if the defect type is head warping or tail warping, and the unevenness is less than or equal to 4mm/m, the plate shape quality is qualified;
if the defect type is head warping or tail warping, and the unevenness is more than 4mm/m, the plate shape quality is unqualified;
if the defect type is other types and the unevenness is less than or equal to 5mm/m, the quality of the plate shape is qualified;
if the defect type is other type, the unevenness is more than 5mm/m, the quality of the plate shape is "fail".
4. The case matching-based roll quenching process operation parameter setting method according to claim 1, wherein the sample data marked as "qualified" contained in the case base comprises raw material parameters, state parameters and quenching machine operation parameters of the plate shape.
5. The case matching-based roll quenching process operation parameter setting method according to claim 1, wherein the thickness conditions are 0.8 × tn-straw-Ts-straw-1.2 × tn; wherein Tn is the thickness of the plate of the current production case, and Ts is a sample case plate thickness mark in the case library;
the way to normalize the thickness, width, length and production time is to calculate using equation (1):
wherein, y is the normalized output, x is the input characteristic parameter, [ ymin, ymax ] is the mapping range, [ -1,1], (xmin, xmax) is the minimum and maximum of the input data set;
the weighted Euclidean distance between the sample cases in the normalized case library and the characteristic parameters of the current production case is calculated by using a formula (2):
wherein ds is a weighted Euclidean distance between the current production case plate and the sample case, and a1, a2, a3 and a4 are preset weights of thickness, width, length and production time set according to actual experience; wn, ln and Tn are the width, length and production time of the current production case plate respectively, and Ws, ls and Ts are the width, length and production time of the sample case s respectively.
6. The case matching-based roll quenching process operation parameter setting method according to claim 1, wherein the updating of the case base comprises the steps of:
step S1: defining a counter C =0;
step S2: in the production process, judging whether the current plate is consistent with the raw material information of the previous plate or not according to the plate type, the specification thickness, the width and the length of the steel plate; the judgment conditions are as follows:
gn and Gp are respectively the type of the plate of the current production case and the type of the previous plate; tp, wp and Lp are respectively the thickness, width and length of the previous plate;
and step S3: if the production condition changes, the counter C is set to zero; if the current plate is not changed, further judging whether the operating parameters of the quenching machine used by the current plate are the same as the operating parameters of the quenching machine used by the previous plate; if the two values are the same, the counter C is increased by one, otherwise, the counter C is set to zero;
and step S4: repeating the steps S2-S3; when C = k, adding the operating parameters of the quenching machine in a case library; and reset C to 0; where k is a counter threshold set based on practical experience.
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| CN103586288A (en) * | 2013-03-25 | 2014-02-19 | 宝山钢铁股份有限公司 | Method for creating case library of hot-rolled strip steel plate shapes |
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