CN112044959B - Method for preventing error in calculation of volume diameter - Google Patents
Method for preventing error in calculation of volume diameter Download PDFInfo
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- CN112044959B CN112044959B CN202010789385.XA CN202010789385A CN112044959B CN 112044959 B CN112044959 B CN 112044959B CN 202010789385 A CN202010789385 A CN 202010789385A CN 112044959 B CN112044959 B CN 112044959B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- ZPOLOEWJWXZUSP-WAYWQWQTSA-N bis(prop-2-enyl) (z)-but-2-enedioate Chemical compound C=CCOC(=O)\C=C/C(=O)OCC=C ZPOLOEWJWXZUSP-WAYWQWQTSA-N 0.000 claims abstract description 40
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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- Mathematical Physics (AREA)
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- Mathematical Optimization (AREA)
- Theoretical Computer Science (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- Algebra (AREA)
- Operations Research (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Probability & Statistics with Applications (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Evolutionary Biology (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
The invention relates to the technical field of cold rolling, in particular to a method for preventing coil diameter calculation errors. And calculating the LENGTH (s _ LENGTH _ RUN) of the actual strip steel discharging by using the speed and time integral, then grabbing the current roll diameter value (s _ POR _ DIAM _ NOW) at a certain moment, and calculating the perimeter of the uncoiler by using the current roll diameter value as the compared LENGTH (s _ LENGTH _ COMP). When the length of the uncoiled strip steel reaches the comparison length, the coil diameter value (s _ POR _ DIAM _ OLD) captured at the last moment is compared with the current coil diameter value (s _ POR _ DIAM _ NOW), and the coil diameter difference value (s _ DIAM _ CHG) is calculated. When the value (s _ DIAM _ CHG) is larger than or equal to the actual thickness value (s _ DIAM _ CHG _ MIN) of the strip steel, the coil diameter calculation is correct; otherwise, the coil diameter is judged to be wrong in calculation, the uncoiling speed limit is set to be below 60m/min, and alarm information is sent out. The invention prevents the strip steel tail running accident caused by inaccurate calculation of the uncoiling coil diameter.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a method for preventing coil diameter calculation errors.
Background
Cold rolling is generally a rolled sheet or very thin sheet, which has high requirements on the surface quality of the steel strip. The raw materials are generally hot-rolled coils fed from other hot-rolling plants, and are oxidized seriously during transportation, especially after long storage time. The defects of oxidized iron scales, rusty spots and the like on the surface of the raw material can be washed off by acid washing, so that the surface is smooth and clean. Firstly, accidents such as strip breakage, steel adhesion and the like can be avoided during rolling, and secondly, the surface of a finished product can be smooth, and no black spots and rust marks exist, so that a defective product is produced.
At present, in the process of controlling acid washing and discharging by a Siemens S5-PLC control system, because the system has no calculation error protection program, the coil diameter of an uncoiler is not calculated frequently, the calculated length of strip steel is not consistent with the actual length of the strip steel, the strip steel runs at a high speed, and a loop is rushed into the strip steel to damage mechanical equipment, so that long-time shutdown accidents are caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for preventing the error of the calculation of the roll diameter. The strip steel tail running accident caused by inaccurate calculation of the uncoiling coil diameter is prevented.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A method for preventing a roll diameter calculation error specifically comprises the following steps:
step one, reading the thickness value of hot-rolled strip steel in secondary data by a PLC (programmable logic controller) as a coil diameter comparison value s _ DIAM _ CHG _ MIN of one coil running of an uncoiler;
step two, when the strip steel at the inlet section of the machine set is welded and the speed of the inlet section is increased to more than 90m/min, the roll diameter calculation protection program starts to be put into use;
step three, at the moment of putting the coil diameter calculation protection program into operation, the PLC records a coil diameter calculation value s _ POR _ DIAM _ OLD at the current moment, and calculates the outer diameter and perimeter s _ LENGTH _ COMP of the steel coil at the moment:
s_LENGTH_COMP＝π×s_POR_DIAM_OLD
the symbols in the formula:
s _ LENGTH _ COMP is the perimeter of the outer diameter of the steel coil, and is mm;
s _ POR _ DIAM _ OLD is a calculated value of the volume diameter at the current moment, mm;
and starting integral calculation on the actual strip steel discharging LENGTH s _ LENGTH _ PASS clear 0;
step four: calculating the actual strip steel discharging LENGTH s _ LENGTH _ PASS by using the time integral of the inlet main command speed;
step five: when the discharging LENGTH of the strip steel is equal to the external diameter circumference of the steel coil, namely s _ LENGTH _ PASS is equal to s _ LENGTH _ COMP, grabbing the coil diameter feedback value s _ POR _ diameter _ NOW, and calculating the uncoiling coil diameter difference s _ diameter _ CHG:
s_DIAM_CHG＝s_POR_DIAM_OLD-s_POR_DIAM_NOW
the symbols in the formula:
s _ DIAM _ CHG is the uncoiled coil diameter difference, mm;
s _ POR _ DIAM _ NOW is the coil diameter feedback value at the moment of grabbing, mm;
after the uncoiling coil diameter difference s _ DIAM _ CHG is calculated, storing the current coil diameter value into s _ POR _ DIAM _ OLD, clearing 0 for the actual strip steel discharging length, and preparing for next cycle calculation;
step six: comparing the uncoiling roll diameter difference s _ DIAM _ CHG with a roll diameter comparison value s _ DIAM _ CHG _ MIN, and if:
if s _ DIAM _ CHG is larger than or equal to s _ DIAM _ CHG _ MIN, the volume diameter calculation is considered normal; otherwise, the alarm signal is sent out and the speed of the inlet section is limited to be below 60m/min if the alarm signal is abnormal;
and (5) circularly operating the protection program steps four, five and six until the uncoiling and discharging are finished.
Compared with the prior art, the invention has the beneficial effects that:
the method utilizes the strip steel discharging length obtained by the integral calculation of the main linear velocity of the pickling section inlet to calculate the accuracy of the coil diameter calculation of the uncoiler. And an uncoiling calculation linkage program is added, so that the strip steel tail running accident caused by inaccurate uncoiling coil diameter calculation is prevented.
Detailed Description
The invention discloses a method for preventing roll diameter calculation errors, and a person skilled in the art can appropriately improve process parameters by referring to the content of the text. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
A method for preventing a roll diameter calculation error specifically comprises the following steps:
step 1, reading the thickness value of the hot-rolled strip steel in the secondary data by a PLC (programmable logic controller) as a coil diameter comparison value (s _ DIAM _ CHG _ MIN) of one coil running of an uncoiler:
and 2, when the strip steel at the inlet section of the machine set is welded and the speed of the inlet section is increased to more than 90m/min, starting a coil diameter calculation protection program.
And step 3: at the moment of putting the coil diameter calculation protection program into operation, recording a coil diameter calculation value (s _ POR _ DIAM _ OLD) at the current moment, and calculating the outer diameter and the perimeter (s _ LENGTH _ COMP) of the steel coil at the current moment:
s_LENGTH_COMP＝π×s_POR_DIAM_OLD
the symbols in the formula:
s _ LENGTH _ COMP is the perimeter of the outer diameter of the steel coil, and is mm;
s _ POR _ DIAM _ OLD is a calculated value of the volume diameter at the current moment, mm;
and the integral calculation is started for the actual strip steel discharging LENGTH (s _ LENGTH _ PASS) to be clear 0.
And 4, step 4: and calculating the actual strip steel discharging LENGTH (s _ LENGTH _ PASS) by using the time integral of the inlet main command speed.
And 5: when the discharging LENGTH of the strip steel is equal to the external diameter circumference of the steel coil, namely s _ LENGTH _ PASS is equal to s _ LENGTH _ COMP, a coil diameter feedback value (s _ POR _ diameter _ NOW) at the moment is grabbed, and an uncoiling coil diameter difference s _ diameter _ CHG is calculated:
s_DIAM_CHG＝s_POR_DIAM_OLD-s_POR_DIAM_NOW
the symbols in the formula:
s _ DIAM _ CHG is the uncoiled coil diameter difference, mm;
s _ POR _ DIAM _ NOW is the coil diameter feedback value at the moment of grabbing, mm;
and after the uncoiling coil diameter difference (s _ DIAM _ CHG) is calculated, storing the current coil diameter value into s _ POR _ DIAM _ OLD, clearing 0 for the actual strip steel discharging length, and preparing for next cycle calculation.
Step 6: comparing the uncoiling coil diameter difference (s _ DIAM _ CHG) with a coil diameter comparison value (s _ DIAM _ CHG _ MIN), if:
and if s _ DIAM _ CHG > is s _ DIAM _ CHG _ MIN, the coil diameter calculation is considered to be normal (no tail-running accident occurs), otherwise, the coil diameter calculation is considered to be abnormal, an alarm signal is sent out, and the speed of the inlet section is limited to 60 m/MIN.
And (4) circularly operating the protection program steps 4, 5 and 6 until the uncoiling and discharging are finished.
[ examples ] A method for producing a compound
When a certain hot rolled coil is discharged and rolled by an uncoiler, the secondary thickness value (s _ DIAM _ CHG _ MIN) of the hot rolled strip steel is 3.0mm, and when the strip steel at the inlet section of the unit is welded and the speed of the inlet section is increased to more than 90m/MIN, the uncoiler calculates the coil diameter D (T) to be 1500 mm. Calculating to obtain:
s_LENGTH_COMP＝1500mm×π≈4712.4mm
the average speed measured by the inlet master roll was 180m/min, the running time was calculated:
T＝4712.4mm÷3000mm/s＝1.57s
when the unwinding run T is 1.57s, the unwinder calculates the diameter d (T) of the coil to 1497 mm.
D (T) -D (t) ~ 1500-.
The method utilizes the strip steel discharging length obtained by the integral calculation of the main linear velocity of the pickling section inlet to calculate the accuracy of the coil diameter calculation of the uncoiler. And an uncoiling calculation linkage program is added, so that the strip steel tail running accident caused by inaccurate uncoiling coil diameter calculation is prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A method for preventing a roll diameter calculation error is characterized by comprising the following steps:
step one, reading the thickness value of the strip steel by a PLC (programmable logic controller) as a coil diameter comparison value s _ DIAM _ CHG _ MIN of one coil running of an uncoiler;
step two, when the strip steel at the inlet section of the machine set is welded and the speed of the inlet section is increased to more than 90m/min, the roll diameter calculation protection program starts to be put into use;
step three, at the moment of putting the coil diameter calculation protection program into operation, the PLC records a coil diameter calculation value s _ POR _ DIAM _ OLD at the current moment, and calculates the outer diameter and perimeter s _ LENGTH _ COMP of the steel coil at the moment:
s_LENGTH_COMP＝π×s_POR_DIAM_OLD
the symbols in the formula:
s _ LENGTH _ COMP is the perimeter of the outer diameter of the steel coil, and is mm;
s _ POR _ DIAM _ OLD is a calculated value of the volume diameter at the current moment, mm;
and starting integral calculation on the actual strip steel discharging LENGTH s _ LENGTH _ PASS clear 0;
step four: calculating the actual strip steel discharging LENGTH s _ LENGTH _ PASS by using the time integral of the inlet main command speed;
step five: when the discharging LENGTH of the strip steel is equal to the external diameter circumference of the steel coil, namely s _ LENGTH _ PASS is equal to s _ LENGTH _ COMP, grabbing the coil diameter feedback value s _ POR _ diameter _ NOW, and calculating the uncoiling coil diameter difference s _ diameter _ CHG:
s_DIAM_CHG＝s_POR_DIAM_OLD-s_POR_DIAM_NOW
the symbols in the formula:
s _ DIAM _ CHG is the uncoiled coil diameter difference, mm;
s _ POR _ DIAM _ NOW is the coil diameter feedback value at the moment of grabbing, mm;
after the uncoiling coil diameter difference s _ DIAM _ CHG is calculated, storing the current coil diameter value into s _ POR _ DIAM _ OLD, clearing 0 for the actual strip steel discharging length, and preparing for next cycle calculation;
step six: comparing the uncoiling roll diameter difference s _ DIAM _ CHG with a roll diameter comparison value s _ DIAM _ CHG _ MIN, and if:
if s _ DIAM _ CHG is larger than or equal to s _ DIAM _ CHG _ MIN, the volume diameter calculation is considered normal; otherwise, the alarm signal is sent out and the speed of the inlet section is limited to be below 60m/min if the alarm signal is abnormal;
and (5) circularly operating the protection program steps four, five and six until the uncoiling and discharging are finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010789385.XA CN112044959B (en) | 2020-08-07 | 2020-08-07 | Method for preventing error in calculation of volume diameter |
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| CN202010789385.XA CN112044959B (en) | 2020-08-07 | 2020-08-07 | Method for preventing error in calculation of volume diameter |
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| CN112044959B true CN112044959B (en) | 2022-03-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10230309A (en) * | 1997-02-21 | 1998-09-02 | Hitachi Metals Ltd | Rolling mill and method for automatically collecting rolling time |
| CN102721388A (en) * | 2012-05-30 | 2012-10-10 | 中冶南方工程技术有限公司 | Method and system for accurately determining roll diameter value of strip steel rolling machine |
| CN103521551A (en) * | 2013-10-31 | 2014-01-22 | 武汉钢铁(集团)公司 | Steel coil diameter determining method of uncoiler or coiler in steel rolling technology |
| CN103530510A (en) * | 2013-10-09 | 2014-01-22 | 鞍钢股份有限公司 | Method for improving calculation accuracy of steel coil weight |
| CN108126986A (en) * | 2017-12-21 | 2018-06-08 | 安徽马钢自动化信息技术有限公司 | Strip dynamic coil diameter computational methods |
| CN208516569U (en) * | 2018-07-04 | 2019-02-19 | 上海新时达机电科技有限公司 | One kind batching coil diameter computing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9095886B2 (en) * | 2011-06-27 | 2015-08-04 | University Of Central Florida Research Foundation, Inc. | Mill control system and method for control of metal strip rolling |
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- 2020-08-07 CN CN202010789385.XA patent/CN112044959B/en active Active
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|---|---|---|---|---|
| JPH10230309A (en) * | 1997-02-21 | 1998-09-02 | Hitachi Metals Ltd | Rolling mill and method for automatically collecting rolling time |
| CN102721388A (en) * | 2012-05-30 | 2012-10-10 | 中冶南方工程技术有限公司 | Method and system for accurately determining roll diameter value of strip steel rolling machine |
| CN103530510A (en) * | 2013-10-09 | 2014-01-22 | 鞍钢股份有限公司 | Method for improving calculation accuracy of steel coil weight |
| CN103521551A (en) * | 2013-10-31 | 2014-01-22 | 武汉钢铁(集团)公司 | Steel coil diameter determining method of uncoiler or coiler in steel rolling technology |
| CN108126986A (en) * | 2017-12-21 | 2018-06-08 | 安徽马钢自动化信息技术有限公司 | Strip dynamic coil diameter computational methods |
| CN208516569U (en) * | 2018-07-04 | 2019-02-19 | 上海新时达机电科技有限公司 | One kind batching coil diameter computing device |
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