CN112570465B - Thin T5 material S-shaped middle wave defect forecasting method - Google Patents
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Abstract
The invention relates to a forecasting method for S-shaped middle wave defects of thin T5 materials, which comprises the following steps: the first step is as follows: tracking and collecting process data; the second step: judging whether the current time is positive or negative; the third step: a determination of probability is generated. According to the technical scheme, a large amount of production data of normal strip shape and S-shaped middle wave strip shape defects are tracked, collected and contrastively analyzed on site, and based on the change of the forward slip value and the rolling force of a fifth rack, a thin T5 material S-shaped middle wave defect forecasting method is provided, so that the technical problem that the S-shaped middle wave strip shape defects which are alternately asymmetric and generated on strip steel rolled by changing working rolls of the fifth rack cannot be effectively forecasted when the existing cold continuous rolling mill rolls the ultrathin T5 material.
Description
Technical Field
The invention relates to a forecasting method, in particular to a forecasting method for S-shaped middle wave defects of thin T5 materials, and belongs to the field of cold rolling processes.
Background
At present, a large amount of cold-rolled steel strips are widely used in the fields of automobiles, household electrical appliances, packaging and the like, and the products with thinner thickness, higher performance and higher strength are increasingly required to be used in consideration of light weight and low cost. Referring to fig. 1, when rolling a steel strip with an extremely thin gauge of T5, a thickness of 0.17-0.2mm, a yield strength of 320Mpa and a tensile strength of 420Mpa in a conventional 5-stand 6-roll UCM cold continuous rolling mill, a suitable transition material is generally arranged to avoid changing a working roll of a fifth stand on the extremely thin T5, but in case of abnormal conditions, such as scratches on the surface of the steel strip, the roll change on the T5 is also forced. When the fifth frame working roll is replaced in the T5 material production process, the first rolled strip steel rolled after roll replacement is finished is easy to generate alternately asymmetric bubble waves, so that the shape of the whole roll is poor, and the T5 material strip steel yield is seriously influenced.
The tracking measurement finds that the bubble waves can be approximately in a projection shape with the diameter of about 70-80 mm, are approximately circular, have a bulge-type three-dimensional appearance, are approximately 0.4mm high, are irregularly distributed in the length direction and the width direction of the strip steel, are sometimes intensively distributed on the working side of the strip steel, are sometimes intensively distributed on the transmission side of the strip steel, are alternately distributed in the full-length range of the strip steel, and have the characteristics of bilateral alternation and asymmetry. When the method is seen from a plate shape stress cloud chart actually measured by a plate shape instrument, an over-extension area of the type of plate shape defects mainly appears in the middle area of strip steel, a very wide middle wave even approaching the full width of the strip steel exists similarly, the maximum extension point of the middle wave in the width direction is in an S shape periodically and continuously changing along the length direction of the strip steel, and the S shape defects are obviously different from the existing known wave shape defects such as various single-side waves, middle waves and the like, so the S shape middle wave plate shape defects are named as the S shape middle wave plate shape defects in the industry according to the extension distribution characteristics of the type of asymmetric plate shape defects on the plate shape stress cloud chart. At present, no relevant forecasting method and means aiming at the plate-shaped defects exist in the industry.
Retrieving a bilateral wave and middle wave plate shape control method for a five-frame cold continuous rolling high-strength steel plate strip in the patent publication-CN 201811233342.2, and the disclosed technology and the technology both relate to the field of cold rolling plate shape control, but the disclosed technology is mainly based on comparing a calculated value and an actual measured value of the bilateral wave or middle wave plate shape at the outlet of the ith frame, and calculating and correcting a corrected value of the bending force of a working roll and an intermediate roll of the ith-2 frame so as to enable the bilateral wave or middle wave plate shape at the outlet of the ith frame to meet the quality requirement. The disclosed technology mainly aims at the defects of double-side waves and medium waves of a five-stand cold continuous rolling high-strength steel plate, and the technology mainly aims at solving the defect that when a working roll of a fifth stand is replaced in the production process of the ultrathin T5 material, an alternative asymmetric bubble-shaped S-shaped medium wave plate shape is generated on the strip steel after the roll replacement is finished, and the technical schemes of the two technologies are completely different in specific problems and specific contents and do not have any technical inspiration.
Retrieving a thin-specification quenched and tempered plate shape control method of mixed edge waves and middle waves-CN201910006890. X of the patent publication, the plate shape control method is used for treating light and middle waves by matching light and heavy different pressing amounts along the width direction with different pressing amounts of two different plastic deformation rates. The disclosed technology and the present technology both relate to the shape control, but the problems to be solved by the two technologies are completely different, so that the technical solutions of the two technologies have great difference, and no related technical teaching exists between the two technologies, and therefore, a new solution for solving the technical problems is urgently needed.
Disclosure of Invention
The invention provides a method for forecasting an S-shaped middle wave defect of a thin T5 material, which aims at solving the technical problem that the traditional cold continuous rolling mill cannot effectively forecast the S-shaped middle wave defect of the alternative asymmetry generated on the band steel rolled by the working roll changing of the fifth rack when rolling an ultrathin T5 material.
In order to achieve the purpose, the technical scheme of the invention is as follows, and the method for forecasting the S-shaped middle wave defect of the T5 material with the thin specification are characterized by comprising the following steps of:
the first step is as follows: tracking and collecting process data;
the second step is that: judging whether the current time is positive or negative;
the third step: a determination of probability is generated.
As an improvement of the present invention, the first step: and tracking and collecting process data, specifically, when rolling an ultrathin T5 material, in the first rolling process after finishing the roll change of the working roll of the fifth rack, tracking and collecting relevant process data and parameters on line and in real time by a production line process control computer.
As an improvement of the present invention, the second step: specifically, according to the characteristic of the fluctuation trend of the forward slip value when S-shaped middle wave plate shape defects occur, the average value of the forward slip values of the fifth rack of the T5 strip steel within the range of more than 0 and less than or equal to 700 meters is contrastively analyzed
And establishing a judgment standard related to the forward slip value for the generation of the S-shaped middle waves.
As an improvement of the present invention, the third step: and (3) judging the generation probability, specifically, according to the characteristics of the fluctuation trend of the rolling force when the S-shaped middle wave plate shape defect occurs, comparing and analyzing the average value of the rolling force of the T5 material strip steel in the range of more than 0 and less than or equal to 700 meters with a set value ratio (F'), and establishing a judgment standard related to the rolling force for the generation of the S-shaped middle wave, wherein L refers to the distance of the head of the T5 material strip steel passing through the fifth rack and is unit meter.
As an improvement of the invention, in the second step, the speed V of the rolling stock at the outlet is measured during rolling h Greater than the peripheral speed V of the roll at that location, i.e. V h This phenomenon of > V is called forward slip. In rolling theory, the ratio of the difference between the product exit velocity and the linear speed of the peripheral velocity of the rolls is generally referred to as the forward slip value, i.e.:
in the formula: s. the h : forward slip value
V h Velocity of rolled product at exit
V roll peripheral speed.
As an improvement of the present invention, the tracking and collecting of relevant process data and parameters in the first step mainly comprises: the average value of the real-time rolling force of the fifth frame is compared with the set value ratio (F') and the average value of the forward slip value
As an improvement of the present invention, in the second step, a criterion related to a forward slip value is established for the generation of the S-shaped middle wave, which specifically includes:
(1) When L is less than or equal to 500, if
If the S-shaped middle wave plate shape defect can occur certainly, the judgment is finished; if it is not
The S-shaped middle wave plate shape defect can not occur and the judgment is finished;
(2) When L is more than or equal to 600 and less than or equal to 700, if
If the S-shaped middle wave plate shape defect can occur certainly, the judgment is finished; if it is used
The S-shaped middle wave plate shape defect can not occur and the judgment is finished.
As an improvement of the present invention, the third step of establishing a judgment criterion related to the rolling force for the generation of the S-shaped middle wave specifically includes:
(1) When L is less than or equal to 500, if F 'is less than or equal to 1.7 and less than or equal to 1.8, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.26 and less than or equal to 1.3, the S-shaped middle wave plate shape defect can occur with 90% probability, and the judgment is finished;
(2) When L is less than or equal to 500, if F 'is less than or equal to 1.6 and less than or equal to 1.7, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.26 and less than or equal to 1.22, the S-shaped middle wave plate-shaped defect can occur with 70% probability, and the judgment is finished;
(3) When L is less than or equal to 500, if F 'is less than or equal to 1.5 and less than or equal to 1.6, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.22 and more than or equal to 1.18, the S-shaped middle wave plate-shaped defect can occur with 50% probability, and the judgment is finished;
(4) When L is less than or equal to 500, if F 'is less than or equal to 1.4 and less than or equal to 1.5, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.18 and more than or equal to 1.14, the S-shaped middle wave plate shape defect can occur with 30 percent of probability, and the judgment is finished;
(5) When L is less than or equal to 500, if F 'is less than or equal to 1.3 and less than or equal to 1.4, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.1, then the S-shaped middle wave plate-shaped defect occurs with a probability of 10%, and the judgment is finished
Compared with the prior art, the method has the advantages that 1) the technical scheme directly tracks the change of the forward slip value and the rolling force of the fifth rack in the production process on line, so that the method can be used for rapidly judging and forecasting the S-shaped middle wave plate shape defect generated by the cold continuous rolling mill after the working roll of the fifth rack is changed when the cold continuous rolling mill rolls an ultrathin T5 material, and the S-shaped middle wave plate shape defect is eliminated by further adopting measures for a production line, thereby avoiding the S-shaped middle wave plate shape defect on the whole roll of strip steel; the S-shaped middle wave plate shape defect is a plate shape defect which can only occur under a special working condition in cold continuous rolling production, and has no attention to the industry because the occurrence probability is extremely low and the S-shaped middle wave plate shape defect is easy to be confused with other plate shape defects;
2) The data which needs to be collected and judged by the forecasting method are normal real-time process data of the production line, the collection and judgment processes are convenient and fast, additional data collection equipment does not need to be added, the collection, data operation and judgment can be completed through a production line process control computer, and the forecasting method has the characteristic of being fast to implement.
3) According to the scheme, the occurrence condition of the S-shaped middle wave plate shape defect of the whole roll (about 10000 m) of the T5 material can be clearly forecasted only by tracking the process parameters within the first 700 m of the T5 material rolled strip steel on line, so that the product yield of the T5 material production is greatly improved, the waste and defective products are reduced, the economic benefit is considerable, and the energy conservation and the environmental protection are facilitated.
4) In the scheme, the occurrence condition of the S-shaped middle wave shape defects is firstly and definitely forecasted, the occurrence rate of the S-shaped middle wave shape defects is then forecasted, and the rapidity of the whole forecast is effectively improved through different forecast priority levels. Mass production practices prove that the technology can forecast within 5 seconds after T5 material passes through the fifth rack at the fastest speed, and time guarantee is provided for the next step of taking measures to eliminate defects in a production line.
Drawings
FIG. 1 is a schematic view of a conventional five stand rolling mill
FIG. 2 is a flow chart of the prediction method
In the figure: 1-strip steel, 2-tension roller, 3-NO1 rack, 4-NO2 rack, 5-NO3 rack, 6-NO4 rack, 7-NO5 rack, 8-coiler, 9-supporting roller, 10-intermediate roller and 11-working roller.
The specific implementation mode is as follows:
for the purpose of promoting an understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Example 1: referring to fig. 1-2, the invention discloses a method for forecasting S-shaped middle wave defects of thin T5 materials, which specifically comprises the following steps:
the first step is as follows: tracking and collecting process data, when rolling the ultra-thin T5 material strip steel 1, in the first rolling process after the roll change of the working roll 11 of the fifth rack 7, tracking and collecting relevant process data and parameters on line and in real time by a production line process control computer, wherein the relevant process data and parameters comprise the average value of the real-time rolling force of the fifth rack 7, the ratio F' of a set value and the average value of a forward slip value
And T5, the distance L (unit meter) of the strip head of the strip steel passes through the fifth rack;
the second step: judging whether the forward slip value is zero or not, and automatically comparing and analyzing the average value of the forward slip values of the T5 strip steel in the fifth rack 7 within the range of L being more than 0 and less than or equal to 700 meters on line by the process control computer according to the characteristic of the forward slip value fluctuation trend when S-shaped middle wave plate shape defects occur
Establishing a discrimination standard related to the forward sliding value for the generation of the S-shaped middle waves, and outputting a discrimination result, wherein the discrimination standard specifically comprises the following steps:
(1) When L is less than or equal to 500, if
If the S-shaped middle wave plate shape defect can occur certainly, finishing the judgment; if it is used
The S-shaped middle wave plate shape defect can not occur and the judgment is finished.
(2) When L is more than or equal to 600 and less than or equal to 700,if it is used
If the S-shaped middle wave plate shape defect can occur certainly, finishing the judgment; if it is used
The S-shaped middle wave plate shape defect can not occur and the judgment is finished;
the third step: a determination of the probability is generated. According to the characteristics of the rolling force fluctuation trend when the S-shaped middle wave plate shape defect occurs, the process control computer automatically contrasts and analyzes the average value of the rolling force of the fifth rack 7 and the ratio (F') of the rolling force of the T5 strip steel to the set value within the range of more than 0L and less than or equal to 700 m on line, establishes a judgment standard related to the rolling force for the generation of the S-shaped middle wave and outputs a judgment result, and specifically comprises the following steps:
(1) When L is less than or equal to 500, if F 'is less than or equal to 1.7 and less than or equal to 1.8, and L is more than or equal to 600 and less than or equal to 700, if F' is more than or equal to 1.26 and less than or equal to 1.3, the S-shaped middle wave plate shape defect can occur with 90% probability, and the judgment is finished;
(2) When L is less than or equal to 500, if F 'is less than or equal to 1.6 and less than or equal to 1.7, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.26 and less than or equal to 1.22, the S-shaped middle wave plate-shaped defect can occur with 70% probability, and the judgment is finished;
(3) When L is less than or equal to 500, if F 'is less than or equal to 1.5 and less than or equal to 1.6, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.22 and more than or equal to 1.18, the S-shaped middle wave plate shape defect can occur with 50% probability, and the judgment is finished;
(4) When L is less than or equal to 500, if F 'is less than or equal to 1.4 and less than or equal to 1.5, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.18 and more than or equal to 1.14, the S-shaped middle wave plate shape defect can occur with 30 percent of probability, and the judgment is finished;
(5) When L is less than or equal to 500, if F 'is less than or equal to 1.3 and less than or equal to 1.4, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.1 and less than or equal to 1.14, the S-shaped middle wave plate shape defect can occur with a probability of 10 percent, and the judgment is finished;
application example 1: the first roll of T5 material is switched to specification after the working roll 11 is changed to the fifth frame 7: steel grade DQ4151K2; the thickness is 0.179mm, the width is 1047mm, and the total length is 12000m. The process control computer performs online automatic comparative analysis: passing through the fifth belt headWhen the frame is 350 m, the average value of the forward slip value is 7.8%, and the judgment condition in the step S2 of the method is that: l is less than or equal to 500,
judging that the S-shaped middle wave plate shape defect can occur certainly, and finishing the judgment.
Application example 2: the first roll of T5 material is switched to specification after the working roll 11 is changed to the fifth frame 7: steel grade DQ4151K2; the thickness is 0.18mm, the width is 1047mm, and the total length is 11000m. The process control computer performs online automatic comparative analysis: when the belt head passes through the fifth rack for 460 meters, the average value of the forward slip value is 3.7%, and the judgment conditions in the step S2 of the method are met: l is less than or equal to 500, S h If the judgment result is less than 5.5%, the S-shaped middle wave plate shape defect is definitely avoided, and the judgment is finished.
Application example 3: the first roll of T5 material is switched to specification after the working roll 11 is changed to the fifth frame 7: steel grade DQ4151K2; the thickness is 0.17mm, the width is 835mm, and the total length is 10000m. The average value of the forward sliding value is 3.8-4.2% within 500 meters of the head passing through the fifth rack, and the average value of the forward sliding value is 1.9% when the head passes through 620 meters of the fifth rack, which meets the judgment conditions in the step S2 of the method, namely: l is less than or equal to 500, S h Not less than 7 percent and not less than 3.5 percent, and when L is more than or equal to 600 and less than or equal to 700, S h If the judgment result is less than 2%, the S-shaped middle wave plate shape defect is definitely avoided, and the judgment is finished.
Application example 4: the specification is switched T5 material first roll after the working roll 11 is replaced on the fifth frame 7: steel grade DQ4151K2; the thickness is 0.175mm, the width is 950mm, and the total length is 12000m. The average value of the forward slip value is 5.5-5.2% within 500 meters of the belt head passing through the fifth rack, and the ratio of the average value of the rolling force to the set value is 1.74; when the head of the strip passes through 680 meters of the fifth rack, the average value of the forward slip value is 3.5 percent, and the ratio of the average value of the rolling force to the set value is 1.26; then the determination conditions in the step S3 of the method are met: l is less than or equal to 500, S h Not less than 7 percent and not less than 3.5 percent, not less than 1.7 and not more than 1.8 of F', and not less than 600 and not more than 700 of L, S h Not less than 4 percent and not less than 2 percent, and not less than 1.26 and not more than 1.3, the S-shaped middle wave shape defect can be judged to occur with the probability of 90 percent, and the judgment is finished.
Application examples5: the first roll of T5 material is switched to specification after the working roll 11 is changed to the fifth frame 7: steel grade DQ4151K2; the thickness is 0.171mm, the width is 1000mm, and the total length is 11800m. The average value of the forward slip value is 6.2-6.4% within 500 meters of the belt head passing through the fifth rack, and the ratio of the average value of the rolling force to the set value is 1.34; when the belt head passes through the fifth rack for 640 meters, the average value of the forward slip value is 3.6 percent, and the ratio of the average value of the rolling force to the set value is 1.12; then the determination conditions in the step S3 of the method are met: l is less than or equal to 500, S h Not less than 7 percent and not less than 3.5 percent, 1.3-less than F' < 1.4, and L is more than or equal to 600-less than or equal to 700, S h Not less than 4% and not less than 2%, and not less than 1.1 and not more than F' < 1.3, it is determined that the S-shaped middle wave plate shape defect occurs at a probability of 10%, and the determination is finished.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications or substitutions based on the above-mentioned technical solutions are included in the scope of the present invention.
Claims (3)
1. A forecasting method for S-shaped middle wave defects of T5 materials with thin specifications is characterized by comprising the following steps:
the first step is as follows: tracking and collecting process data;
the second step is that: judging whether the current time is positive or negative;
the third step: judging the probability;
wherein the first step: the method comprises the following steps of tracking and collecting process data, specifically, when an ultrathin T5 material is rolled, in the first rolling process after the roll change of a working roll of a fifth rack is finished, tracking and collecting relevant process data and parameters on line and in real time through a production line process control computer;
the second step is as follows: specifically, according to the characteristic of the fluctuation trend of the forward slip value when the S-shaped middle wave plate-shaped defect occurs, the average value of the forward slip values of the fifth rack of the T5 strip steel within the range of 0L-700 m is contrastively analyzed
Establishing a discrimination standard related to a forward slip value for the generation of S-shaped middle waves, wherein L refers to T5 strip steelThe distance of the belt head passing through the fifth frame is unit meter; in the second step, a judgment standard related to the forward slip value is established for the generation of the S-shaped middle waves, and the judgment standard specifically comprises the following steps:
(1) When L is less than or equal to 500, if
If the S-shaped middle wave plate shape defect can occur certainly, finishing the judgment; if it is not
The S-shaped middle wave plate shape defect can not occur and the judgment is finished;
(2) When L is more than or equal to 600 and less than or equal to 700, if
If the S-shaped middle wave plate shape defect can occur certainly, the judgment is finished; if it is not
The S-shaped middle wave plate shape defect can not occur and the judgment is finished;
the third step is: judging the generation probability, specifically, according to the characteristics of the fluctuation trend of the rolling force when the S-shaped middle wave plate shape defect occurs, comparing and analyzing the average value of the rolling force of the fifth frame of the T5 material strip steel within the range of 0 & lt L & lt or equal to 700 m and a set value ratio F', and establishing a judgment standard related to the rolling force for the generation of the S-shaped middle wave; in the third step, a judgment standard related to the rolling force is established for the generation of the S-shaped middle waves, and the judgment standard specifically comprises the following steps:
(1) When L is less than or equal to 500, if F 'is less than or equal to 1.7 and less than or equal to 1.8, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.26 and less than or equal to 1.3, the S-shaped middle wave plate shape defect can occur with 90% probability, and the judgment is finished;
(2) When L is less than or equal to 500, if F 'is less than or equal to 1.6 and less than or equal to 1.7, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.26 and more than or equal to 1.22, the S-shaped middle wave plate shape defect can occur with 70 percent of probability, and the judgment is finished;
(3) When L is less than or equal to 500, if F 'is less than or equal to 1.5 and less than or equal to 1.6, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.22 and more than or equal to 1.18, the S-shaped middle wave plate shape defect can occur with 50% probability, and the judgment is finished;
(4) When L is less than or equal to 500, if F 'is less than or equal to 1.4 and less than or equal to 1.5, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.18 and more than or equal to 1.14, the S-shaped middle wave plate shape defect can occur with a probability of 30 percent, and the judgment is finished;
(5) When L is less than or equal to 500, if F 'is less than or equal to 1.3 and less than or equal to 1.4, and L is less than or equal to 600 and less than or equal to 700, if F' is less than or equal to 1.1 and less than 1.14, the S-shaped middle wave plate shape defect can occur with a probability of 10%, and the judgment is finished.
2. The thin gauge T5 material S-shaped crowning defect forecasting method according to claim 1, characterized in that in the second step, the velocity V of the rolled piece at the outlet is h Greater than the peripheral speed V of the roll at that location, i.e. V h >This phenomenon of V is called forward slip, and in rolling theory, the ratio of the difference between the product exit velocity and the linear velocity of the peripheral velocity of the roll is generally called forward slip value, that is:
in the formula: s. the h : a forward slip value;
V h velocity at the product exit;
v roll peripheral speed.
3. The method for forecasting the S-shaped middle wave defect of the thin T5 material as claimed in claim 2, wherein the tracking and collecting of the relevant process data and parameters in the first step mainly comprises: average value of real-time rolling force of fifth rack, set value ratio F' and average value of forward slip value
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| CN109226280A (en) * | 2018-10-23 | 2019-01-18 | 东北大学 | The bilateral wave and middle wave board-shape control method of five rack cold continuous rolling high strength steel plate bands |
| CN109513752A (en) * | 2018-11-02 | 2019-03-26 | 北京首钢股份有限公司 | A method of controlling thin narrow specification mild steel tail portion middle wave |
| CN109706303A (en) * | 2019-01-04 | 2019-05-03 | 南京钢铁股份有限公司 | A kind of quenched plate board-shape control method of thin gauge of side wave and middle wave mixing |
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