CN114042881A - Practical casting machine pulling speed calibration method - Google Patents
Practical casting machine pulling speed calibration method Download PDFInfo
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- CN114042881A CN114042881A CN202111389317.5A CN202111389317A CN114042881A CN 114042881 A CN114042881 A CN 114042881A CN 202111389317 A CN202111389317 A CN 202111389317A CN 114042881 A CN114042881 A CN 114042881A
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- 238000005266 casting Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000012795 verification Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a practical casting machine pulling speed calibration method, which relates to the technical field of control of continuous casting machines and comprises the following steps: setting a state, converting a theoretical pulling speed, converting an actual pulling speed, analyzing an error coefficient, assigning an application, checking a theory and verifying production; in the invention, under the shutdown state of a continuous casting machine, a casting mode idles a withdrawal and straightening machine, a velocimeter is used for measuring a withdrawal and straightening roller of the withdrawal and straightening machine to record and display the unit time of the withdrawal speed, the output of a frequency converter and the same revolution of the velocimeter, the theoretical withdrawal speed corresponding to the output frequency is obtained by converting the output frequency of the frequency converter, the actual withdrawal speed is obtained by converting the unit time of the velocimeter and the same revolution of the velocimeter, the ratio of the theoretical withdrawal speed to the actual withdrawal speed is analyzed to obtain an error coefficient, a calibration value is obtained by multiplying the error coefficient by the theoretical withdrawal speed, the calibration value is assigned to equipment related to the withdrawal speed, and the error between the actual withdrawal speed and the theoretical withdrawal speed of the casting machine can be ensured to be within 0.05m/min through verification, so that the process parameters of the related equipment are ensured to be real.
Description
Technical Field
The invention relates to the technical field of control of continuous casting machines, in particular to a practical casting machine pulling speed calibration method.
Background
The drawing speed of the continuous casting machine is the speed of a cast blank drawn out of the crystallizer by a withdrawal and straightening machine, the drawing speed determines the production efficiency of the continuous casting machine, and the conventional unit is m/min which is the most basic and most core parameters in the process production of the continuous casting machine; the production rhythm, the temperature and the drawing speed are matched, the secondary cooling water distribution of the casting machine, the automatic slag feeding, the automatic control of the stopper rod, the process parameters of equipment such as a vibrating table and the like have direct relation with the drawing speed;
at present, a 6SE70 series frequency converter driving motor open-loop control mode is adopted for controlling a withdrawal and straightening machine, the pulling speed is presented after being acquired by a frequency converter and being theoretically calculated for a PLC system, an error exists between the actual pulling speed and the theoretical pulling speed, and the error possibly causes: the invention provides a practical casting machine pulling speed calibration method, which solves the problems in the prior art because the output error of a frequency converter, the abrasion error of equipment and the gliding of a casting blank are higher than the theoretical pulling speed, the error is increased along with the increase of the pulling speed through the field actual measurement, the defect is overcome, the pulling speed error can be solved by adding an encoder to a motor or a driven roller of a pulling and straightening machine, the modification cost is higher, the temperature of the field actual environment is high, the water vapor is higher, the subsequent maintenance difficulty of the encoder is higher and the production is directly influenced under the fault condition.
Disclosure of Invention
Aiming at the problems, the invention provides a practical casting machine pulling speed calibration method which can ensure that the error between the actual pulling speed and the theoretical pulling speed of a casting machine is within 0.05m/min, thereby ensuring that the parameters related to the pulling speed are consistent with the actual field, ensuring that the equipment process parameters related to the pulling speed are real, and ensuring the lean production of the casting machine.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a practical casting machine pulling speed calibration method comprises the following steps:
the method comprises the following steps: set state
Starting a casting mode idling withdrawal and straightening machine under the shutdown state of a continuous casting machine, and measuring withdrawal and straightening roller rotating speed data of the withdrawal and straightening machine by using a velocimeter;
step two: conversion of theoretical pull rate
Firstly, recording the pulling speed displayed by a velocimeter, then recording the output frequency of a frequency converter through a screen of the frequency converter, and converting to obtain the theoretical pulling speed corresponding to the output frequency;
step three: conversion of actual pull rate
Recording unit time of the velocimeter at the same revolution, and converting to obtain the actual pulling speed;
step four: analyzing error coefficients
Analyzing the ratio of the theoretical pulling speed to the actual pulling speed, averaging the ratio of the interval according to the pulling speed interval produced by a specific casting machine, namely an error coefficient;
step five: valuation applications
Multiplying the error coefficient obtained by analysis by a theoretical pulling speed value to obtain a calibration value, and directly assigning the calibration value to the theoretical pulling speed by using a control program of equipment related to the pulling speed so that the equipment related to the pulling speed and the on-site production post are both actual pulling speeds;
step six: theory of calibration
After the control program is used for assignment, the flow from the first step to the fourth step is repeated to check the theory, and the actual error is determined to be within 0.05 m/min;
step seven: production verification
In the production state of a continuous casting machine, the fixed length is taken on the running track of a casting blank, the passing time under the condition of constant drawing speed is recorded, the length is divided by the time to be used as the actual linear speed, the actual linear speed is compared with the theoretical drawing speed for verification, and the error is determined to be within 0.05 m/min.
The further improvement lies in that: in the first step, a velocimeter is used for measuring the rotation speed data of the withdrawal and straightening roller of the withdrawal and straightening machine, and in order to ensure that the data are more accurate, two groups of data are measured every 0.1m/min in the minimum and maximum withdrawal speed intervals of 0m/min-5 m/min.
The further improvement lies in that: in the second step, the specific process of converting the theoretical pulling rate is as follows: and recording the output frequency by a screen of the frequency converter, dividing the rated rotating speed of the motor by the reduction ratio, multiplying by the perimeter pi d of the straightening and withdrawal roll to obtain the theoretical 50HZ pulling speed, and dividing the output frequency by the power frequency 50HZ to obtain the pulling speed corresponding to the output frequency, namely the theoretical pulling speed.
The further improvement lies in that: in the third step, the specific process of converting the actual pulling speed is as follows: and dividing the unit time of the velocimeter at the same revolution by the perimeter pi d of the withdrawal and straightening roller, wherein the perimeter unit is m, the time unit is min, and converting the actual withdrawal speed into m/min.
The further improvement lies in that: in the fourth step, when the theoretical pulling speed is higher than the actual pulling speed, the error coefficient is less than 1; when the theoretical pulling speed is lower than the actual pulling speed, the error coefficient is larger than 1.
The further improvement lies in that: in the fifth step, the device related to the pulling speed specifically includes: the device comprises a pulling speed display device, a casting machine secondary cooling water distribution device, an automatic slag adding device, a stopper rod automatic control device and a vibrating table.
The further improvement lies in that: in the sixth step, the actual error is within 0.05m/min, and the error is a measurement tool and display error and is an allowable error.
The further improvement lies in that: and seventhly, taking a fixed length on the running track of the casting blank, and recording the passing time under the condition of constant drawing speed, wherein the length unit is m, and the time is min.
The invention has the beneficial effects that:
1. the casting mode idling withdrawal and straightening machine utilizes a velometer to measure withdrawal and straightening rollers of the withdrawal and straightening machine to record and display the unit time of the withdrawal speed, the output of a frequency converter and the same revolution of the velometer, utilizes the conversion of the output frequency of the frequency converter to obtain the theoretical withdrawal speed corresponding to the output frequency, utilizes the conversion of the unit time of the same revolution of the velometer to obtain the actual withdrawal speed, obtains an error coefficient by analyzing the ratio of the theoretical withdrawal speed to the actual withdrawal speed, obtains a calibration value by multiplying the error coefficient by the theoretical withdrawal speed, assigns the calibration value to equipment related to the withdrawal speed, and can ensure that the error between the actual withdrawal speed and the theoretical withdrawal speed of the casting machine is within 0.05m/min through verification, thereby ensuring that the parameters related to the withdrawal speed are consistent with the actual site, ensuring that the equipment process parameters related to the withdrawal speed are real, and ensuring the lean production of the casting machine.
2. The encoder is not needed in the whole calibration process, the problem that the encoder cannot be installed on site is solved, and the encoder and the later-period inspection and maintenance cost are saved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example one
Referring to fig. 1, the present embodiment provides a method for calibrating the casting speed of a utility casting machine, which includes the following steps:
the method comprises the following steps: set state
Starting a casting mode idling withdrawal and straightening machine under the shutdown state of a continuous casting machine, measuring withdrawal and straightening roller rotating speed data of the withdrawal and straightening machine by using a velocimeter, and measuring two groups of data every 0.1m/min in the minimum and maximum withdrawal speed intervals of 0m/min-5m/min to ensure more accurate data;
step two: conversion of theoretical pull rate
Firstly, record tachymeter shows the pulling speed, and then through converter screen record converter output frequency, the theoretical pulling speed that the conversion reachs output frequency corresponds is, and concrete flow is: recording output frequency by a screen of a frequency converter, dividing the rated rotating speed of a motor by a reduction ratio, multiplying by the perimeter pi d of a straightening and withdrawing roller to obtain theoretical 50HZ pulling speed, and dividing the output frequency by power frequency 50HZ to obtain the pulling speed corresponding to the output frequency, namely the theoretical pulling speed;
step three: conversion of actual pull rate
Recording unit time of the velocimeter at the same revolution, converting to obtain actual pulling speed, and the specific flow is as follows: dividing the unit time of the velocimeter at the same revolution by the perimeter pi d of the withdrawal and straightening roller, wherein the perimeter unit is m, the time unit is min, and converting the actual withdrawal speed, and the unit is m/min;
step four: analyzing error coefficients
Analyzing the ratio of the theoretical drawing speed to the actual drawing speed, averaging the ratio of the interval according to the drawing speed interval produced by a specific casting machine, namely an error coefficient, wherein the error coefficient is less than 1 when the theoretical drawing speed is greater than the actual drawing speed; when the theoretical pulling speed is lower than the actual pulling speed, the error coefficient is larger than 1.
Example two
Referring to fig. 1, the present embodiment provides a method for calibrating the casting speed of a utility casting machine, which includes the following steps:
the method comprises the following steps: valuation applications
Multiplying the error coefficient obtained by analysis by a theoretical pulling speed value to obtain a calibration value, and directly assigning the calibration value to the theoretical pulling speed by using control programs of a pulling speed display device, a casting machine secondary cooling water distribution device, an automatic slag adding device, a stopper rod automatic control device and a vibration table, so that the actual pulling speed is the on-site production post and the device related to the pulling speed;
step two: theory of calibration
After the control program is used for assignment, the flow from the first step to the fourth step is repeated to verify the theory, and the actual error is determined to be within 0.05m/min, wherein the error is a measurement tool, a display error and an allowable error;
step three: production verification
In the production state of a continuous casting machine, a fixed length is taken on a casting blank running track, the passing time under the condition of constant drawing speed is recorded, the length unit is m, the time is min, the length is divided by the time to be the actual linear speed, the actual linear speed is compared with the theoretical drawing speed for verification, and the error is determined to be within 0.05 m/min.
According to the practical casting machine pulling speed calibration method, under the shutdown state of a continuous casting machine, a casting mode idle withdrawal straightening machine is adopted, a velocimeter is used for measuring a withdrawal straightening roller of the withdrawal straightening machine to record and display the pulling speed, the output of a frequency converter and the unit time of the velocimeter at the same revolution, the theoretical pulling speed corresponding to the output frequency is obtained through the conversion of the output frequency of the frequency converter, the actual pulling speed is obtained through the conversion of the unit time of the velocimeter at the same revolution, the ratio of the theoretical pulling speed to the actual pulling speed is analyzed to obtain an error coefficient, a calibration value is obtained through multiplying the error coefficient by the theoretical pulling speed, equipment related to the pulling speed is assigned, and verification is carried out, so that the error between the actual pulling speed and the theoretical pulling speed of the casting machine is ensured to be within 0.05m/min, the parameters related to the drawing speed are ensured to be consistent with the actual site, the process parameters of the equipment related to the pulling speed are ensured to be real, and the lean production of the casting machine is ensured; and the practical casting machine pulling speed calibration method does not need an encoder in the whole calibration process, solves the problem that the encoder cannot be installed on site, and saves the encoder and the later-stage inspection and maintenance cost.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A practical casting machine pulling speed calibration method is characterized by comprising the following steps:
the method comprises the following steps: set state
Starting a casting mode idling withdrawal and straightening machine under the shutdown state of a continuous casting machine, and measuring withdrawal and straightening roller rotating speed data of the withdrawal and straightening machine by using a velocimeter;
step two: conversion of theoretical pull rate
Firstly, recording the pulling speed displayed by a velocimeter, then recording the output frequency of a frequency converter through a screen of the frequency converter, and converting to obtain the theoretical pulling speed corresponding to the output frequency;
step three: conversion of actual pull rate
Recording unit time of the velocimeter at the same revolution, and converting to obtain the actual pulling speed;
step four: analyzing error coefficients
Analyzing the ratio of the theoretical pulling speed to the actual pulling speed, averaging the ratio of the interval according to the pulling speed interval produced by a specific casting machine, namely an error coefficient;
step five: valuation applications
Multiplying the error coefficient obtained by analysis by a theoretical pulling speed value to obtain a calibration value, and directly assigning the calibration value to the theoretical pulling speed by using a control program of equipment related to the pulling speed so that the equipment related to the pulling speed and the on-site production post are both actual pulling speeds;
step six: theory of calibration
After the control program is used for assignment, the flow from the first step to the fourth step is repeated to check the theory, and the actual error is determined to be within 0.05 m/min;
step seven: production verification
In the production state of a continuous casting machine, the fixed length is taken on the running track of a casting blank, the passing time under the condition of constant drawing speed is recorded, the length is divided by the time to be used as the actual linear speed, the actual linear speed is compared with the theoretical drawing speed for verification, and the error is determined to be within 0.05 m/min.
2. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the first step, a velocimeter is used for measuring the rotation speed data of the withdrawal and straightening roller of the withdrawal and straightening machine, and in order to ensure that the data are more accurate, two groups of data are measured every 0.1m/min in the minimum and maximum withdrawal speed intervals of 0m/min-5 m/min.
3. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the second step, the specific process of converting the theoretical pulling rate is as follows: and recording the output frequency by a screen of the frequency converter, dividing the rated rotating speed of the motor by the reduction ratio, multiplying by the perimeter pi d of the straightening and withdrawal roll to obtain the theoretical 50HZ pulling speed, and dividing the output frequency by the power frequency 50HZ to obtain the pulling speed corresponding to the output frequency, namely the theoretical pulling speed.
4. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the third step, the specific process of converting the actual pulling speed is as follows: and dividing the unit time of the velocimeter at the same revolution by the perimeter pi d of the withdrawal and straightening roller, wherein the perimeter unit is m, the time unit is min, and converting the actual withdrawal speed into m/min.
5. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the fourth step, when the theoretical pulling speed is higher than the actual pulling speed, the error coefficient is less than 1; when the theoretical pulling speed is lower than the actual pulling speed, the error coefficient is larger than 1.
6. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the fifth step, the device related to the pulling speed specifically includes: the device comprises a pulling speed display device, a casting machine secondary cooling water distribution device, an automatic slag adding device, a stopper rod automatic control device and a vibrating table.
7. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: in the sixth step, the actual error is within 0.05m/min, and the error is a measurement tool and display error and is an allowable error.
8. The practical casting machine pulling speed calibration method according to claim 1, characterized in that: and seventhly, taking a fixed length on the running track of the casting blank, and recording the passing time under the condition of constant drawing speed, wherein the length unit is m, and the time is min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111389317.5A CN114042881B (en) | 2021-11-19 | 2021-11-19 | Practical casting machine pull speed calibration method |
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| CN202111389317.5A CN114042881B (en) | 2021-11-19 | 2021-11-19 | Practical casting machine pull speed calibration method |
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| CN114042881B CN114042881B (en) | 2023-06-20 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309296A (en) * | 1969-05-08 | 1973-03-07 | Uss Eng & Consult | System for feedback control of mould level in a continuous casting process utilizing a pour box |
| JPS564360A (en) * | 1979-06-20 | 1981-01-17 | Hitachi Ltd | Pulling speed controlling method of continuous casting machine |
| JPH06154983A (en) * | 1992-11-13 | 1994-06-03 | Kobe Steel Ltd | Torque balancing method for cast slab drawing roll in continuous casting and controller for cast slab drawing device using the method |
| CN103810375A (en) * | 2013-12-30 | 2014-05-21 | 南阳汉冶特钢有限公司 | Optimization method for actual withdrawal speed of slab continuous casting withdrawal and straightening machine |
| CN106111929A (en) * | 2016-07-25 | 2016-11-16 | 江苏联峰能源装备有限公司 | A kind of round billet continuous casting straightening motor load dynamically distributes control system and control method thereof |
| CN206716992U (en) * | 2017-05-19 | 2017-12-08 | 唐山港陆钢铁有限公司 | A kind of pulling speed of continuous casting control system |
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
-
2021
- 2021-11-19 CN CN202111389317.5A patent/CN114042881B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309296A (en) * | 1969-05-08 | 1973-03-07 | Uss Eng & Consult | System for feedback control of mould level in a continuous casting process utilizing a pour box |
| JPS564360A (en) * | 1979-06-20 | 1981-01-17 | Hitachi Ltd | Pulling speed controlling method of continuous casting machine |
| JPH06154983A (en) * | 1992-11-13 | 1994-06-03 | Kobe Steel Ltd | Torque balancing method for cast slab drawing roll in continuous casting and controller for cast slab drawing device using the method |
| CN103810375A (en) * | 2013-12-30 | 2014-05-21 | 南阳汉冶特钢有限公司 | Optimization method for actual withdrawal speed of slab continuous casting withdrawal and straightening machine |
| CN106111929A (en) * | 2016-07-25 | 2016-11-16 | 江苏联峰能源装备有限公司 | A kind of round billet continuous casting straightening motor load dynamically distributes control system and control method thereof |
| CN206716992U (en) * | 2017-05-19 | 2017-12-08 | 唐山港陆钢铁有限公司 | A kind of pulling speed of continuous casting control system |
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
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| CN114042881B (en) | 2023-06-20 |
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