CN115637313A - Method and system for adjusting yield strength of strip steel on line - Google Patents
Method and system for adjusting yield strength of strip steel on line Download PDFInfo
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- CN115637313A CN115637313A CN202211068266.0A CN202211068266A CN115637313A CN 115637313 A CN115637313 A CN 115637313A CN 202211068266 A CN202211068266 A CN 202211068266A CN 115637313 A CN115637313 A CN 115637313A
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Abstract
The invention relates to the technical field of strip steel manufacturing, and discloses a method and a system for adjusting the yield strength of strip steel on line. The mechanical property detector (1) is arranged at the outlet of the annealing furnace and used for detecting the mechanical property of the strip steel after annealing, and the mechanical property detector (2) is arranged at the outlet of the temper mill and used for detecting the mechanical property of the strip steel after flattening. The invention can realize the on-line adjustment of the yield strength of the strip steel; the whole roll of the strip steel with uniform yield strength can be obtained; the working efficiency can be improved, and the adjustment period is shortened; the workload of manual intervention can be reduced, and the realization of automatic production is facilitated.
Description
Technical Field
The invention relates to the technical field of strip steel manufacturing, in particular to a method and a system for adjusting the yield strength of strip steel on line.
Background
The yield strength is a key mechanical performance index of the strip steel and is mainly influenced by factors such as chemical components of a substrate, annealing temperature, leveling elongation and the like, wherein the chemical components and the annealing temperature have large influence on the yield strength and also have large influence on tensile strength and fracture elongation. The leveler is one of the key devices of the annealing unit and has the functions of eliminating the yield platform of the cold-rolled strip steel after recrystallization annealing, improving the flatness of the strip steel, obtaining the surface roughness meeting the requirements of various reprocessing procedures and having a certain control function on the mechanical property. The yield strength can be adjusted by adjusting the leveling elongation, and the influence on the tensile strength and the breaking elongation of the strip steel is relatively small when the yield strength of the strip steel is adjusted by the leveling elongation. Therefore, the adjustment of the yield strength of the strip steel by adjusting the flattening elongation is a common technical means.
The traditional method carries out off-line tensile test on the mechanical property of the cold-rolled strip steel and adjusts the yield strength of the strip steel according to the test result. The method is time-consuming and labor-consuming, and meanwhile, due to the discontinuity of laboratory detection, the overall quality of the whole cold-rolled strip steel cannot be reflected, so that the conclusion obtained by off-line detection can only be limitedly used for guiding process adjustment and stabilizing the product quality. In addition, the conventional method has the following disadvantages: after the strip steel is discharged from a unit, the mechanical performance is detected through manual sample conveying to detection, the performance detection result obtained in the whole process usually needs more than one hour, and if the performance is inconsistent within one hour, continuous multi-coil performance is possibly inconsistent, which is the defect of insufficient timeliness of the traditional performance detection; secondly, after the performance result is obtained, the process needs to be adjusted, the adjustment needs to be repeatedly checked, and the result still needs to be obtained within one hour again, so that the adjustment process is delayed, which is the second disadvantage; thirdly, for a single roll, the conclusion obtained by the off-line detection can only obtain the performance data of the head, the middle and the tail, but cannot really reflect the performance distribution condition of the whole roll, and if a certain section of yield strength is low/high, the on-line automatic adjustment cannot be usually realized, so that the uniformity of the yield strength of the whole roll is easily insufficient.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method and a system for adjusting the yield strength of strip steel on line, which solve the problems in the background technology.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a method and a system for adjusting the yield strength of strip steel on line mainly comprise an annealing furnace 1, a mechanical property detector (1) at the outlet of the annealing furnace 4, a temper mill 7, a mechanical property detector (2) at the outlet of the temper mill 9 and two sets of control systems which are called a first control system and a second control system respectively for convenience in description. Wherein, the mechanical property detector (1) and (4) are arranged at the outlet of the annealing furnace and are used for detecting the mechanical property of the strip steel after annealing, and the mechanical property detector (2) and (9) are arranged at the outlet of the temper mill and are used for detecting the mechanical property of the strip steel after flattening. The first control system carries out feed-forward control on the leveling elongation of the leveling machine 7 according to the actual yield strength detection result of the mechanical property detector (1) and (4), and simultaneously carries out feedback control on the process parameters of the annealing furnace 1 according to the mechanical property detection result of the mechanical property detector (1) (the specific process parameters comprise strip steel heating temperature, strip steel soaking temperature, strip steel slow cooling temperature, strip steel fast cooling temperature and the like), so that online real-time feedback control on the mechanical property of strip steel is realized; the second control system is provided with a mechanical property detector (2) and a feedback controller (9) for detecting the actual yield strength of the leveled strip steel and controlling the leveling elongation of the leveling machine (7) in a feedback manner, so that the online real-time feedback control of the yield strength of the strip steel is realized.
Preferably, the first control system feeds back the process parameters of the annealing furnace 1 automatically according to the mechanical property detection result of the mechanical property detector (1) and (4), and the controlled process parameters also comprise the unit speed.
Preferably, the first control system is provided with a comparison table of yield strength deviation and preset elongation compensation amount of each steel grade, and the comparison table is used for preset control of the elongation of the temper mill.
Preferably, the first control system is provided with a comparison table of the yield strength deviation of each steel type and the annealing parameter compensation amount, and the compensation amount of each annealing process parameter is searched in the comparison table according to the yield strength deviation of each steel type, so that the feedback control of the mechanical property of the strip steel is realized.
Preferably, the second control system is provided with a comparison table for compensating yield strength deviation and elongation of different steel types, the detection result of the mechanical property detector (2) 9 is uploaded to the second control system, the second control system searches the elongation compensation value of the corresponding steel type in the comparison table according to the yield strength deviation, and then sends the elongation compensation value to the L1 control system of the temper mill 7 to execute feedback control, so that online yield strength adjustment is realized.
Preferably, the second control system is provided with a self-learning function, the comparison table of the yield strength deviation and the elongation compensation of each steel grade is automatically learned and maintained, and the second control system can automatically call self-learned data to automatically control when the steel grade is produced again.
Preferably, the picture design delta epsilon of the leveler HMI picture and the mechanical property detector picture is used for receiving and displaying the elongation compensation value issued by the second control system in real time so as to facilitate the monitoring of an operator.
Preferably, the second control system is provided with a yield strength surplus manual input data interface on an HMI picture, an operator manually inputs the yield strength surplus according to the requirements of products and users, and the second control system performs feedback control by taking the minimum yield strength plus the yield strength surplus required by the users as a feedback automatic control target value.
(III) advantageous effects
The invention provides a method and a system for adjusting the yield strength of strip steel on line, which have the following beneficial effects:
the invention can realize the on-line adjustment of the yield strength of the strip steel; the whole roll of the strip steel with uniform yield strength can be obtained; the working efficiency can be improved, and the adjustment period can be shortened; the workload of manual intervention can be reduced, and the realization of automatic production is facilitated.
Drawings
FIG. 1 is a schematic diagram of a system for on-line adjustment of yield strength of strip steel according to the present invention;
FIG. 2 is a schematic diagram of the implementation position of a strip steel continuous annealing unit or a hot galvanizing unit.
In the figure: 1. an annealing furnace; 2. 6# tension roller; 3. strip steel; 4. a mechanical property detector (1); 5. a middle loop; 6. 7# tension roller; 7. a leveling machine; 8. 8# tension roller; 9. and a mechanical property detector (2).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a technical solution: a method and a system for adjusting the yield strength of strip steel on line are provided, the system comprises: a set of mechanical property detector (1) is arranged behind the annealing furnace 1 and in front of the temper mill 7, and another set of mechanical property detector (2) is arranged behind the outlet of the temper mill 7. The mechanical properties of the annealed strip steel 3 leaving the annealing furnace 1, passing through a No. 6 tension roller 2, passing through a mechanical property detector (1) & lt 4 & gt are detected by a first control system, and including yield strength, tensile strength and elongation at break, the mechanical property detector (1) & lt 4 & gt detects the actual yield strength, and the first control system performs feed-forward control on the elongation at break of the temper mill 7 according to the detection result of the mechanical property detector (1) & lt 4 & gt, and simultaneously performs feedback control on the strip steel heating temperature and the strip steel soaking temperature of the annealing furnace according to the detection result of the mechanical property detector (1) & lt 4 & gt (it is required to say that the feedback control of the strip steel heating temperature and the strip steel soaking temperature in the embodiment is that the feedback control is carried out by the strip steel heating temperature and the strip steel soaking temperature, and different steel types are used in practice, the feedback control parameters are different, can be slow cooling temperature, fast cooling temperature, unit speed and the like, and are selected and determined according to the steel types), then enters a middle loop 5, and then passes through a pre-temper mill 6 to reach the temper mill 7 after the strip steel is leveled, and passes through a post-temper mill tension roller 8 after the strip is leveled, and then passes through the mechanical property detector (2 & lt 9 & gt, and the mechanical property detector (2 & lt 9 & gt, and the mechanical property detector 9 & lt 9 & gt and the mechanical property detector 2 & lt 9 & gt can obtain the mechanical property detector when the strip steel passes through the mechanical property detector 9 & lt 2 & gt). And the second control system feeds back and adjusts the leveling elongation rate parameter of the leveling machine 7 according to the yield strength result obtained by actual measurement, so as to realize the feedback control of the yield strength of the strip steel. In the embodiment, the mechanical property detector (1) 4 and the mechanical property detector (2) 9 are respectively provided with an independent computer, and are respectively provided with a first control system software and a second control system software, so that the mechanical property detector can be used for displaying the mechanical property of the strip steel in real time and issuing a control target value to a unit annealing furnace DCS control system and a complete machine L1 basic automatic control system. The second control system is provided with a special comparison table for compensating the yield strength deviation and the elongation percentage of each steel grade, has a self-learning function, automatically performs learning maintenance on the comparison table for compensating the yield strength deviation and the elongation percentage of each steel grade, and can automatically call self-learned data for automatic control when the steel grade is reproduced subsequently.
Specific example 1: a certain annealing unit produces HC420/780DP products, after 3 strip heads of strip steel leave the annealing furnace 1, the mechanical property detector (1) and 4 detect that the yield strength is only 408MPa, the tensile strength of the strip steel is only 773MPa, the yield strength is reduced by 12MPa and the tensile strength is reduced by 7MPa according to the product requirements, and a first control system makes two adjustments according to the measurement result of the mechanical property detector (1 and 4): 1) The target value of the temperature of the quick cooling outlet of the annealing furnace is reduced by 10 ℃, and the tensile strength of the product is improved by improving the cooling rate and improving the martensite content; 2) The flat elongation of the HC420/780DP product is modified, the preset value is improved to 1.0 percent from 0.8 percent of the quality design, and the yield strength of the product is improved. After the head of the strip steel 3 is leveled by a leveling machine 7, the strip steel passes through a mechanical property detector (2) ' 9, the actually measured yield strength is 459MPa, the tensile strength is 778MPa, a second control system carries out feedback control according to the yield strength control target value = contract yield strength minimum value + yield strength allowance =420MPa +20MPa =440MPa (the yield strength allowance is set by an operation controller according to the requirements of products and users), the leveling elongation of the strip steel is gradually adjusted to be about 0.92%, the strip steel with the target value of the quick cooling outlet temperature of the annealing furnace reduced at the moment is discharged from the annealing furnace, the yield strength is 413MPa after the strip steel passes through a mechanical property detector (1) ' 4 ', the tensile strength of the strip steel is 802MPa, the leveling elongation feedback control is carried out, the yield strength of the leveled strip steel is adjusted to be within 440 +/-5 MPa, and the online quick adjustment of the mechanical property of an HC 420/DP product to be in a qualified range is realized.
Specific example 2: a certain annealing unit produces HC700/980DP products, after 3 strip heads of strip steel leave the annealing furnace 1, the mechanical property detector (1) detects that the yield strength is up to 786MPa, the tensile strength of the strip steel reaches 1123MPa, the strength is obviously higher, and a first control system makes two adjustments according to the measurement result of the mechanical property detector (1) and (4): 1) The target value of the temperature of a quick cooling outlet of the annealing furnace is increased by 15 ℃, and the yield strength and the tensile strength of the product are reduced by reducing the cooling rate and reducing the martensite content; 2) The flat elongation of the HC700/980DP product is modified to reduce the preset value from 0.6% to 0.3% of the quality design, and the yield strength of the product is reduced. After the head of the strip steel 3 is leveled by a leveling machine 7, the strip steel passes through a mechanical property detector (2) '9, the actual measured yield strength is 798MPa, the tensile strength is 1133MPa, a second control system carries out feedback control according to the yield strength control target value = contract yield strength minimum value + yield strength allowance =700MPa +30MPa =730MPa (the yield strength allowance is set by an operation controller according to the requirements of products and users), the leveling elongation of the strip steel is gradually adjusted to be about 0.15%, the strip steel with the target value of the rapid cooling outlet temperature of the annealing furnace improved at the moment is taken out of the annealing furnace, the yield strength detected by a mechanical property detector (1)' 4 is 718MPa, the tensile strength of the strip steel is 1052MPa, the leveling elongation feedback control is carried out, the yield strength of the leveled strip steel is adjusted to be within 730 +/-10 MPa, and the online rapid adjustment of the mechanical property of HC700/980DP products to be within the qualified range is realized.
Specific example 3: a certain annealing unit produces HC820/1180DP products, after a strip steel 3 leaves an annealing furnace 1 with a head, the mechanical property detector (1) and the mechanical property detector (4) detect that the yield strength only reaches 775MPa, the tensile strength of the strip steel only reaches 1151MPa, the strength is obviously lower, and a first control system performs two adjustments according to the measurement result of the mechanical property detector (1) and the measurement result of the mechanical property detector (4): 1) The heating temperature and the soaking temperature of the annealing furnace are increased by 15 ℃, and more austenite is obtained to transform and form martensite, so that the strength of the product is improved; 2) The flat elongation of the HC820/1180DP product is modified, the preset value of the flat elongation is improved to 0.3 percent from 0.2 percent of the quality design, and the yield strength of the product is improved. After the head of the strip steel 3 is leveled by a leveling machine 7, the head of the strip steel is subjected to actual measurement of yield strength 836MPa and tensile strength 1172MPa by a mechanical property detector (2) ' 9, the second control system performs feedback control according to the yield strength control target value = contract yield strength minimum value + yield strength allowance =820MPa +30MPa =850MPa (the yield strength allowance is set by an operation controller according to the requirements of products and users), the leveling elongation of the strip steel is gradually adjusted to be about 0.35%, the strip steel with the target value of the rapid cooling outlet temperature of the annealing furnace improved at the moment is taken out of the annealing furnace, the yield strength is 806MPa and the tensile strength of the strip steel is 1198MPa after being detected by a mechanical property detector (1) ' 4 ', and the yield strength of the leveled is adjusted to be within 850 +/-20 MPa through the leveling elongation feedback control, so that the mechanical property of the HC820/1180DP product is quickly adjusted to be within the qualified range on line.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method and a system for adjusting the yield strength of strip steel on line are characterized in that: comprises two sets of on-line mechanical property detectors and two sets of control systems; two sets of on-line mechanical property detectors, one set of which is arranged at the outlet of the annealing furnace and in front of the temper mill, and the other set of which is arranged at the outlet of the temper mill; the device comprises two control systems, wherein one set of control system adjusts the preset flattening elongation of a flattening machine through the mechanical property measurement result of the annealed strip steel detected by a first set of mechanical property detector arranged at the outlet of an annealing furnace and in front of the flattening machine, so as to realize the feedforward control of the yield strength of the strip steel, and realizes the online feedback control of the mechanical property of the annealing of the strip steel through online real-time adjustment of an annealing process; and the other set of control system detects the mechanical property of the leveled strip steel through a second set of mechanical property detector arranged at the outlet of the leveling machine, and feeds back and controls the leveling elongation of the strip steel according to the measurement result to realize the feedback control of the leveling elongation.
2. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: the real-time adjustment annealing process of the first set of control system comprises the following steps: the heating temperature of the strip steel, the soaking temperature of the strip steel, the slow cooling temperature of the strip steel, the fast cooling temperature of the strip steel and the annealing speed.
3. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: the first set of control system is provided with a comparison table of yield strength deviation of various steel types and annealing parameter compensation quantity, and the compensation quantity of each annealing process parameter is searched in the comparison table according to the yield strength deviation of various steel types, so that the feedback control of the mechanical property of the strip steel is realized.
4. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: the first set of control system is provided with a comparison table of the yield strength deviation and the preset compensation amount of the elongation percentage of each steel type and is used for the preset control of the elongation percentage of the temper mill, and the second set of control system is provided with a comparison table of the yield strength deviation and the feedback control compensation amount of the elongation percentage of each steel type and is used for the automatic feedback control of the yield strength deviation of the strip steel.
5. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 4 are characterized in that: the comparison table of the yield strength deviation and the elongation percentage of each steel type and the set compensation amount and the comparison table of the yield strength deviation and the elongation percentage feedback control compensation amount of each steel type are provided with a self-learning function, and the self-learned data can be automatically called to carry out adjustment control subsequently.
6. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: the online mechanical performance detection result is ensured to be basically consistent with the actual measurement result detected by the detection and testing by regularly comparing the online mechanical performance detection result with the actual measurement result detected by the detection and testing and correcting the online mechanical performance detection result according to the detection and testing test result.
7. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: the system automatically acquires the actual measurement result of the assay and performs fitting correction on the online measurement result in real time.
8. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: and the picture design delta epsilon of the leveler HMI picture and the mechanical property detector picture is used for receiving and displaying the elongation compensation value issued by the second control system in real time so as to be convenient for an operator to monitor.
9. The method and the system for on-line adjusting the yield strength of the strip steel according to claim 1 are characterized in that: and the second control system is provided with a yield strength surplus manual input data interface on an HMI picture, an operator manually inputs the yield strength surplus according to the requirements of products and users, and the second control system performs feedback control by taking the minimum yield strength plus the yield strength surplus as a feedback automatic control target value according to the requirement of a user.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211068266.0A CN115637313A (en) | 2022-09-02 | 2022-09-02 | Method and system for adjusting yield strength of strip steel on line |
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| CN202211068266.0A CN115637313A (en) | 2022-09-02 | 2022-09-02 | Method and system for adjusting yield strength of strip steel on line |
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| CN202211068266.0A Pending CN115637313A (en) | 2022-09-02 | 2022-09-02 | Method and system for adjusting yield strength of strip steel on line |
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