CN114589205A - Method for determining online roll changing time node in strip rolling process - Google Patents
Method for determining online roll changing time node in strip rolling process Download PDFInfo
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- CN114589205A CN114589205A CN202210369127.5A CN202210369127A CN114589205A CN 114589205 A CN114589205 A CN 114589205A CN 202210369127 A CN202210369127 A CN 202210369127A CN 114589205 A CN114589205 A CN 114589205A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/12—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll camber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/24—Roll wear
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention relates to a method for determining an on-line roll changing time node in a plate strip rolling process, which comprises the following steps of firstly, dividing the situation that a roll needs to be changed into two types, wherein one type is that the maximum abrasion loss of the roll is overlarge, and the roll cannot realize set rolling reduction at the moment; and the other is that the roller has large abrasion uneven degree, and the quality of the produced plate strip product can not meet the requirement. Secondly, based on the existing roller wear gauge model, the invention designs a set of flow method for determining the online roller change time node of the roller in the plate and strip rolling process by considering the maximum roller wear and the uneven roller wear degree. The method can describe the non-uniform degree of the roller abrasion, and can further determine the appropriate online roller changing time node according to the non-uniform degree of the roller abrasion, thereby overcoming the problem of poor accuracy of the online roller changing time node determined by experience in the process of rolling the plate strip, further improving the continuity and the automation degree of the rolling production of the plate strip product, and being beneficial to the high-quality and stable production of the plate strip product.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for determining an online roll changing time node in a strip rolling process.
Background
The iron and steel industry is an important basic industry of national economy and directly reflects the comprehensive strength of the country. The plate and strip products account for a large proportion of steel products and are widely applied to the fields of food, medical treatment, automobiles, aerospace and the like. The Strip products can be divided into hot rolled strips and cold rolled strips according to different production modes, the production trend of continuous casting and rolling and hot cooling instead is generated in recent years, a series of new technologies represented by ESP (engineering Strip production) endless rolling technology are generated, the production efficiency of the thin plate Strip is improved, and the energy consumption is obviously reduced. Whether the hot rolling production mode or the cold rolling production mode is adopted, the roller is used as a main production part, the abrasion is very serious, and the roller abrasion is non-uniform due to the influence of a plurality of factors. In the process of rolling the plate strip, when the abrasion non-uniformity degree of the roller is too large, the product quality problems such as plate shape and the like can occur. Therefore, after the rolling mileage reaches a certain value, the roller needs to be replaced and polished, so that the service life of the roller is prolonged, and the quality of a plate strip product is guaranteed. With the continuous improvement of the automation and continuity requirements of the steel industry, the method for determining roll changing time nodes to stop and change rolls according to production experience is gradually lagged behind, and the production requirements cannot be met.
Beginning before and after 80 years of the last century, a large number of scholars study the wear rules of the roller to obtain a series of roller wear prediction models, mainly calculate the wear loss of the roller in the rolling process and the roller shape curve of the worn roller, and make up for the defect of determining the wear severity of the roller according to production experience to a certain extent. The chinese patent publication No. 107321797 discloses an on-line roll changing method for a short-process finishing mill group, which solves the problem of roll changing during shutdown and improves the continuity and production efficiency of rolling production. The roll changing is carried out on line, namely, the roll changing is not stopped, two methods for changing the roll on line are shown in figure 1, and the roll changing is divided into a '5 + 1' mode and a '5-1' mode by taking the roll changing of a certain ESP production line finishing mill group as an example. The '5 + 1' mode is that 1 spare machine frame F6 is added on the original machine frame, when a certain machine frame, such as the F5 machine frame needs to change the roll, the F5 machine frame is lifted, and the spare machine frame F6 is pressed down, the method can not generate the wedge-shaped area theoretically, and the finished plate belt does not need to be cut. The '5-1' mode is that the number of the original frames is kept unchanged, when a certain frame, such as an F4 frame, needs to be replaced, the F4 frame is lifted to replace rollers, 4 frames are used for rolling temporarily, after the rollers are replaced, the F4 frame is pressed down to restore the rolling state of the normal 5 frames, wedge-shaped areas can be generated by the method, and the corresponding areas of the finished plate strips need to be cut.
The above-described on-line roll change technique does not solve the problem of determining roll change time nodes. The roll changing time node is determined according to production experience, so that the roll changing time is easy to be early or late. When the roll changing time node is earlier, the abrasion of the roll is not serious, the production requirement can be met, and the roll changing can increase the grinding cost of the roll. When the roll changing time node is late, the roll is seriously abraded, the produced plate and strip products cannot meet the requirements, the waste of steel and energy is caused, and the service life of the roll is influenced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for determining an online roll change time node in a strip rolling process, which can describe a non-uniform degree of roll wear, and further determine a suitable online roll change time node according to the non-uniform degree of roll wear, so as to overcome a problem of poor accuracy of determining the online roll change time node by experience in the strip rolling process, and further improve continuity and automation degree of strip product rolling production.
The technical scheme adopted by the invention is as follows:
the invention provides a method for determining an online roll changing time node in a strip rolling process, which comprises the following steps of:
s1, obtaining the initial roll shape curve S of the roller1(x) Dividing the roller into n sections;
s2, obtaining rolling process parameters and specifications of rolled strips, wherein the rolling process parameters comprise strip steel materials, roller diameters, rolling temperature, rolling pressure, strip width (outlet and inlet), contact arc length, rolling length and the like;
s3, setting the maximum abrasion loss threshold value W of the rollermaxA roller wear amount change rate threshold value delta W and the number N of sections allowing the roller wear amount change rate to exceed the threshold value;
s4, calculating the wear amount W of each section of roller by using the existing formulaj(x)；
S5, wear amount W of the middle part of the contact section of the roller and the sheet stripmidFor reference, the rate of change of each roll relative to the reference is calculated, i.e.
S6, judging the abrasion loss W of each segment of rollerj(x) Whether or not the threshold value, i.e. W, has been reachedj(x)<WmaxIf the roll change time is not the roll change time node t, the roll is required to be changed on line, and a roll wear curve S is calculated2(x)＝S1(x)-ΔWj(x)；
S7, judging the wear change rate delta W of each segment of rollerj(x) Whether or not a set threshold value, i.e. Δ W, is reachedj(x)<ΔWmaxIf yes, returning to the step S4 to continue calculating and judging, otherwise, continuing to execute the next process;
s8, calculating the wear change rate delta W of each section of rollerj(x) Calculating a set threshold value delta W of the change rate of the abrasion loss of the rollermaxThe number of roller segments a, and recording an angle mark j;
s9, judging whether the change rate of the abrasion loss of each section of the roller reaches a set threshold value delta WmaxWhether the number of stages a of (a) reaches a set threshold value N, namely a<If N is true, setting a to zero, namely a is 0, returning to step S4 to continue calculation and judgment, otherwise, considering that the uneven degree of roller abrasion is too large, the quality of produced plate and strip products does not meet the requirement, judging that the roller is the roller changing time node t at the moment, performing online roller changing on the roller, and calculating a roller abrasion curve S2(x)＝S1(x)-ΔWj(x)。
Further, the specific setting method of step S3 is as follows: actually measured roll on-machine front roll shape curve S'1(x) And post-production roll form S'2(x) The same was divided into n parts along the roll body, and the actual wear W 'of each segment of the roll was calculated'j(x)＝S’1(x)-S’2(x) Finding out the maximum abrasion loss W'max(x) Is the threshold value Wmax(ii) a Calculating the change rate delta W of the abrasion loss of the roller of each section relative to the abrasion loss of the roller of the middle section’j(x) Counting the number of corresponding segments according to the actual uneven wear condition of the roller, setting the number of the corresponding segments as N, and selecting the segment with the smallest value in the N segments as delta Wmax。
Compared with the prior art, the invention has the following beneficial effects:
1. the existing roller wear model is mature, and part of the existing roller wear model is applied in actual production, the roller wear model can be directly developed and applied on the basis of the model, only judgment thresholds are set according to the actual production condition of a production line, the roller wear model and the production line do not need to be matched again, the period of technology upgrading is shortened, and the enterprise cost can be effectively reduced.
2. The online roll changing time node is determined from the two aspects of the maximum roll abrasion loss and the roll abrasion loss change rate, and the online roll changing time node is applicable to wider working conditions, simple and efficient.
3. The scientificity and the accuracy of determining the online roll changing time node are improved, the waste of resources in the production process is reduced, and the production cost is reduced. Meanwhile, the invention can be applied to the hot-rolled strip steel on-line roll changing technology and the cold-rolled production line plate strip rolling production process, has wide application range and improves the continuity and the automation degree of the plate strip production.
Drawings
FIG. 1 is a schematic diagram of two prior art online roll change methods;
FIG. 2 is a schematic illustration of the initial roll shape of the roll;
FIG. 3 is a schematic view of two roll shapes after the roll has worn;
FIG. 4 is a schematic illustration of the amount of roll wear in FIG. 3;
fig. 5 is a schematic flow chart of a method for determining an online roll change time node in a strip rolling process according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
The present embodiment is a flat roll, but the method of the present invention is also applicable to rolls with other roll shape curves. As shown in FIG. 2, the initial roll shape before the roll is rolled on the machine can be obtained by processing the drawing sheet to obtain the initial roll shape curve S of the roll along the length direction of the roll body1(x) In that respect After a certain rolling distance, the worn roll profile of the roll is shown in fig. 3. The abrasion of the roller is the most serious at the part contacted with a rolled piece, and according to different rolling process parameters and specifications of rolled products, the roller usually presents an inverted U shape with serious abrasion in the middle and small abrasion quantity on two sides or an M shape with small abrasion in the middle and serious abrasion on two sides at the part contacted with a plate strip. Wear amount W of rollj(x) The relationship between the wear amount of the roll and the roll profile wear curve of the roll is shown in fig. 4, which can be calculated by various existing formulas, and thus the roll profile wear curve S of the roll can be calculated2(x)＝S1(x)-Wj(x)。
The method for determining the online roll changing time node in the strip rolling process provided by the embodiment is specifically implemented as follows, as shown in fig. 5:
s1, obtaining the initial roll shape curve S of the roll according to the processing drawing of the roll1(x) (ii) a According to the specification (length, diameter and the like) of the roller, the roller is uniformly divided into n (odd number) sections, wherein any section is marked as j section, and the size of n is moderate, so that the change of the roller shape curve of each section of the roller is small, and the roller diameter of the section of the roller can be replaced by the roller diameter on the middle section of the roller.
S2, obtaining rolling process parameters and specifications of a rolled plate strip for bringing the parameters into a roller wear amount calculation model to calculate the roller wear amount; the wear calculation formula of the selected roller is different, and generally comprises strip steel material, roller diameter, rolling temperature, rolling pressure, strip inlet width, strip outlet width, contact arc length, rolling length and the like.
S3, the abrasion speed of the roller is not only related to the rolling process parameters and the specification of the rolled plate strip, but also related to the working condition environment of the specific rolling production line. Setting the maximum abrasion loss threshold value W of the roller according to the requirements on the shape of the product and the working conditions of a specific rolling production linemaxA roller wear amount change rate threshold value delta W and the number N of sections allowing the roller wear amount change rate to exceed the threshold value; the specific setting method comprises the following steps: actually measured roll on-machine front roll shape curve S'1(x) And post-production roll form S'2(x) The same are divided into n parts along the roll body, and the actual abrasion loss W 'of each segment of the roll is calculated'j(x)＝S’1(x)-S’2(x) Finding out the maximum abrasion loss W'max(x) Is the threshold value Wmax(ii) a Calculating the change rate delta W of the abrasion loss of the roller of each section relative to the abrasion loss of the roller of the middle section’j(x) Counting the number of corresponding segments according to the actual uneven wear condition of the roller, setting the number as N, and selecting the segment with the smallest value in the N segments as delta Wmax。
S4, calculating the wear of the roller at the middle section of each roller segment by using the existing formula, and taking the wear as the wear W of the roller segmentj(x) (ii) a Because the factors influencing the roller wear amount are numerous and random on-site influencing factors exist, the roller wear amount calculation model needs to be matched with an actual production line to optimize some parameters, and the method can be based on the existing roller wear amount calculation model, so that the matching of the wear amount calculation model and the production line is omitted, and a large amount of time and cost are saved.
S5, wear amount W of the middle part of the contact section of the roller and the sheet stripmidFor reference, the rate of change of each roll relative to the reference is calculated, i.e.
Wherein WmidThe calculation method of (3) is the same as the method of calculating the wear amount of each segment of the roll described in step S4.
S6, judging the abrasion loss W of each segment of rollerj(x) Whether or not the threshold value, i.e. W, has been reachedj(x)<WmaxIf the roll change time node t is determined, the roll needs to be changed online, and a roll wear curve S is calculated2(x)＝S1(x)-ΔWj(x)。
S7, if the abrasion loss of each segment of roller does not reach the set threshold value, continuously judging the change rate delta W of the abrasion loss of each segment of rollerj(x) Whether or not a set threshold value, i.e. Δ W, is reachedj(x)<ΔWmaxAnd if yes, returning to the step S4 to continue calculation and judgment, otherwise, continuing to execute the next process.
S8, the influence of the unevenness of a certain section of the roller on the plate shape of the plate strip product is not very large, and the quality of the produced plate strip product is within an acceptable range, so that the change rate delta W of the abrasion loss of each section of the roller is calculated after one section of mileage is rolledj(x) Then, the calculation is performed until the set threshold value Δ W of the change rate of the wear amount of the roll is reachedmaxAnd record the corner mark j.
S9, judging whether the change rate of the abrasion loss of each section of the roller reaches a set threshold value delta WmaxWhether the number of stages a of (a) reaches a set threshold value N, namely a<If N is true, setting a to zero, namely a is 0, returning to step S4 to continue calculation and judgment, otherwise, considering that the uneven degree of roller abrasion is too large, the quality of produced plate and strip products does not meet the requirement, judging that the roller is the roller changing time node t at the moment, performing online roller changing on the roller, and calculating a roller abrasion curve S2(x)＝S1(x)-ΔWj(x)。
At this point, the online roll changing time node t in the process of plate and strip rolling is determined, and the abrasion loss W of the rolling roll is calculatedj(x) Roll profile wear curve S2(x) And the degree of unevenness of the roll (maximum amount of wear of the roll, rate of change in amount of wear of each segment of the roll, and overrun)The number of segments a that is thresholded and the segment subscript).
The action principle of the invention is as follows: the method comprises the steps of dividing the condition that roll replacement is needed into two conditions of excessive local abrasion loss and excessive uneven abrasion degree, calculating the abrasion loss of each section of the roll, the change rate of the abrasion loss of the roll relative to the abrasion loss of the middle section of the roll and the number of actual sections exceeding the threshold value of the change rate of the abrasion loss of the roll, comparing the three quantities with the set threshold value, judging whether the roll needs to be replaced or not, determining roll replacement time nodes, combining an online roll replacement technology to realize online roll replacement, and improving the continuity and the automation degree of strip production.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (2)
1. A method for determining an online roll change time node in a strip rolling process is characterized by comprising the following steps:
s1, obtaining the initial roll shape curve S of the roller1(x) Dividing the roller into n sections;
s2, obtaining rolling process parameters and specifications of rolled strips, wherein the rolling process parameters comprise strip steel materials, roller diameters, rolling temperature, rolling pressure, strip width (outlet and inlet), contact arc length, rolling length and the like;
s3, setting the maximum abrasion loss threshold value W of the rollermaxA roller wear amount change rate threshold value delta W and the number N of sections allowing the roller wear amount change rate to exceed the threshold value;
s4, calculating the wear amount W of each section of roller by using the existing formulaj(x)；
S5, wear amount W of the middle part of the contact section of the roller and the sheet stripmidFor reference, the rate of change of each roll relative to the reference is calculated, i.e.
S6, judging the abrasion loss W of each segment of rollerj(x) Whether or not the threshold value, i.e. W, has been reachedj(x)<WmaxIf the roll change time is not the roll change time node t, the roll is required to be changed on line, and a roll wear curve S is calculated2(x)＝S1(x)-ΔWj(x)；
S7, judging the wear change rate delta W of each segment of rollerj(x) Whether or not a set threshold value, i.e. Δ W, is reachedj(x)<ΔWmaxIf yes, returning to the step S4 to continue calculating and judging, otherwise, continuing to execute the next process;
s8, calculating the wear change rate delta W of each section of rollerj(x) Calculating a set threshold value delta W of the change rate of the abrasion loss of the rollermaxThe number of roller segments a, and recording an angle mark j;
s9, judging whether the change rate of the abrasion loss of each section of the roller reaches a set threshold value delta WmaxWhether the number of stages a of (a) reaches a set threshold value N, namely a<If N is true, setting a to zero, namely a is 0, returning to step S4 to continue calculation and judgment, otherwise, considering that the uneven degree of roller abrasion is too large, the quality of produced plate and strip products does not meet the requirement, judging that the roller is the roller changing time node t at the moment, performing online roller changing on the roller, and calculating a roller abrasion curve S2(x)＝S1(x)-ΔWj(x)。
2. The method for determining the on-line roll change time node in the strip rolling process according to claim 1, wherein the method comprises the following steps: the specific setting method of step S3 is as follows: actually measured roll on-machine front roll shape curve S'1(x) And post-production roll form S'2(x) The same are divided into n parts along the roll body, and the actual abrasion loss W 'of each segment of the roll is calculated'j(x)＝S’1(x)-S’2(x) Finding out the maximum abrasion loss W'max(x) Is the threshold value Wmax(ii) a Calculating the change rate of the abrasion loss of the roller relative to the abrasion loss of the roller at the middle sectionΔW’j(x) Counting the number of corresponding segments according to the actual uneven wear condition of the roller, setting the number of the corresponding segments as N, and selecting the segment with the smallest value in the N segments as delta Wmax。
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