CN112170504B - Roll gap calibration control method of large six-roll CVC cold rolling mill - Google Patents
Roll gap calibration control method of large six-roll CVC cold rolling mill Download PDFInfo
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- CN112170504B CN112170504B CN202010914548.2A CN202010914548A CN112170504B CN 112170504 B CN112170504 B CN 112170504B CN 202010914548 A CN202010914548 A CN 202010914548A CN 112170504 B CN112170504 B CN 112170504B
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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
- B21B37/58—Roll-force control; Roll-gap control
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Abstract
The invention relates to the technical field of control of rolling mills in the metallurgical industry, and discloses a roll gap calibration control method of a large six-roll CVC cold rolling mill, wherein the CVC cold rolling mill calibrates a roll gap zero position by pressing a roll system after replacing a roll, and the method comprises the following specific steps: roll gap pre-calibration, screw-down mechanism position control, rolling force control mode switching, main transmission speed switching and rolling oil system control. According to the invention, the closing process of the upper and lower roll systems of the rolling mill is divided into two sections of speed rates, so that the closing speed of the roll gap of the second section is reduced, and the impact force at the moment of contact of the upper and lower roll systems can be reduced. In the process of closing the roll gap, the working roll rotates at a low speed of 20m/min, and is in dynamic contact under the lubricating and cooling effects of rolling oil, so that the surface of the roll is prevented from being damaged due to local stress in the process, the method effectively avoids transverse roll marks generated in the static pressing process of the roll, the service life of the roll is prolonged, and the production efficiency and the product quality are improved.
Description
Technical Field
The invention relates to the technical field of control of rolling mills in the metallurgical industry, in particular to a roll gap calibration control method of a large six-roll CVC cold rolling mill.
Background
In recent years, with the development of industrial technology, the demand of cold-rolled products is more and more large, the requirement on the surface quality of cold-rolled strips is also more and more high, and in order to ensure the surface quality of the strips, good working roll surface quality is required to provide support. The large-scale cold rolling mill is calibrated after the roller is replaced, or the rolling mill needs to perform the roll gap closing action in the no-load state in the process of producing the gap warm roller. At the moment of closing the roll gap, the upper working roll and the lower working roll are impacted, the surface appearance of a local area is damaged, and the surface appearance is transferred to the surface of a strip to form a periodic transverse roll mark. The rolling of products which can not meet the high quality requirements.
In order to improve the surface quality of a strip and avoid the defect of transverse roll marks caused by static pressing of a roller, a roll gap calibration control method of a large six-roller CVC cold rolling mill is provided through rigorous technical analysis and experimental verification.
Disclosure of Invention
The invention provides a roll gap calibration control method of a large six-roll CVC cold rolling mill, which aims to overcome the defects of the prior art, is beneficial to improving the quality of the plate surface of the output and avoids the product quality defect caused by transverse roll marks generated by pressing.
In order to achieve the purpose, the invention provides the following technical scheme:
a roll gap calibration control method of a large six-roll CVC cold rolling mill comprises the following steps:
firstly, after a roller is replaced, firstly, opening the roller gap to the maximum position, and when a proximity switch positioned at the top of a rack senses the retraction position of an RGC cylinder, setting a rough initial position value for the roller gap by a control system to finish the pre-calibration of the roller gap;
secondly, pressing a roll gap calibration button and starting a roll gap calibration sequence control program under the condition of meeting the roll gap calibration condition;
thirdly, judging the position of a roll gap; if the position of the roll gap is more than 10mm, closing the roll gap to the position of 10mm, and when the position deviation and the inclination deviation are within an allowable range, opening rolling oil and enabling the roll to rotate at the linear speed of 20 m/min; if the position of the roll gap is less than 10mm, directly opening rolling oil, and enabling the roll to rotate at the linear speed of 20 m/min;
fourthly, when the rolling oil is opened and the linear velocity of the roller is not zero, switching to a rolling force control mode, and then closing the roller gap to the minimum rolling force of 500 KN;
fifthly, continuously increasing the unilateral rolling force to 300KN, so that the roller rotates at the linear speed of 30 m/min; if the CVC shifting roller is not at the calibration position, the roller shifting is carried out after the rotating speed of the roller is increased to 200 m/min; when the CVC roll shifting position is zero, reducing the rotating speed of the roller to 30 m/min;
sixthly, when the unilateral rolling force reaches 300KN, the rolling oil is turned on and the CVC cold rolling mill is in a pre-calibration position, the unilateral rolling force is increased to 2500KN, and roll bending values of a working roll and a middle roll are set to be 20%;
seventhly, when the unilateral rolling force reaches 2500KN and the roll bending value reaches 20%, judging that the unilateral rolling force fluctuation does not exceed 100KN and the change of the inclination value in three scanning periods does not exceed 5 microns, and sending a roll gap calibration command; at the moment, the roll gap position is set to be 0, namely the accurate roll gap zero position;
eighthly, reducing the rotating speed of the roller to 20m/min, and opening the roller gap to reach the minimum rolling force;
and step nine, opening the roll gap to a position of 10mm, then closing the rolling oil and stopping the main motor, finishing the roll gap calibration process, wherein the roll gap closing speed in the step three is 1.5mm/s when the roll gap is closed, and the roll gap closing speed in the step four is 0.8mm/s when the roll gap is closed.
Further, the condition that the roll gap calibration condition is met in the second step means that the high-voltage system is normal, the machine frame area is not stopped, and roll gap pre-calibration is completed.
Further, the linear speed of the roll is controlled to be lower than 30m/min in the process of opening the roll gap to the position of 10mm in the ninth step.
Compared with the prior art, the invention divides the closing process of the upper and lower roll systems of the rolling mill into two sections of speed, reduces the closing speed of the second section of roll gap from 1.5mm/s to 0.8mm/s, thereby reducing the impact force at the moment of contact of the upper and lower roll systems. In addition, in the process of closing the roll gap, the working roll rotates at a low speed of 20m/min and dynamically contacts with the working roll under the lubricating and cooling effects of rolling oil, so that the surface of the roll is prevented from being damaged due to local stress in the process. The method effectively avoids the transverse roll mark generated in the static pressing process of the roller, prolongs the service life of the roller, and improves the production efficiency and the product quality.
Drawings
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a detailed flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In order to achieve the purpose, the roll gap calibration control program is optimized, the roll gap is dynamically closed under the lubricating and cooling effects of rolling oil, the phenomenon that the surface of the roll is damaged due to static pressing of the roll to generate transverse roll marks is avoided, the service life of the roll is prolonged, and the production efficiency and the product quality are improved.
The invention provides a roll gap calibration control method of a large six-roll CVC cold rolling mill, wherein the CVC cold rolling mill calibrates a roll gap zero position by pressing a roll system after a roll is replaced, and the method comprises the following specific steps: roll gap pre-calibration, screw-down mechanism position control, rolling force control mode switching, main transmission speed switching and rolling oil system control. The specific implementation method comprises the following steps:
firstly, after a roller is replaced, firstly, opening the roller gap to the maximum position, and when a proximity switch positioned at the top of a rack senses the retraction position of an RGC cylinder, setting a rough initial position value for the roller gap by a control system to finish the pre-calibration of the roller gap;
secondly, under the condition of meeting the roll gap calibration conditions, such as normal high-pressure system, no shutdown of a frame region, completion of roll gap pre-calibration and the like, pressing a roll gap calibration button, and starting a roll gap calibration sequence control program;
thirdly, judging the position of a roll gap; if the position of the roll gap is more than 10mm, closing the roll gap to the position of 10mm at the speed of 1.5mm/s, and when the position deviation and the inclination deviation are within an allowable range, opening rolling oil and enabling the roll to rotate at the linear speed of 20 m/min; if the position of the roll gap is less than 10mm, directly opening rolling oil, and enabling the roll to rotate at the linear speed of 20 m/min;
fourthly, when the rolling oil is opened and the speed of the rolling mill is not zero, switching to a rolling force control mode, and then closing the roll gap at the speed of 0.8mm/s to the minimum rolling force of 500 KN;
fifthly, continuously increasing the unilateral rolling force to 300KN, so that the roller rotates at the linear speed of 30 m/min; if the CVC shifting roller is not at the calibration position (zero position), the roller shifting is carried out after the rotating speed of the roller is increased to 200 m/min; when the CVC roll shifting position is zero, reducing the rotating speed of the roller to 30 m/min;
sixthly, when the unilateral rolling force reaches 300KN, the rolling oil is turned on and the CVC cold rolling mill is in a pre-calibration position, the unilateral rolling force is increased to 2500KN, and roll bending values of a working roll and a middle roll are set to be 20%;
seventhly, when the unilateral rolling force reaches 2500KN and the roll bending value reaches 20%, judging that the unilateral rolling force fluctuation does not exceed 100KN and the change of the inclination value in three scanning periods does not exceed 5 micrometers, and sending a roll gap calibration command; at the moment, the roll gap position is set to be 0, namely the accurate roll gap zero position;
eighthly, reducing the rotating speed of the roller to 20m/min, and opening the roller gap to reach the minimum rolling force;
and ninthly, opening the roll gap to a position of 10mm under the condition that the speed of the roll is lower than 30m/min, then closing the rolling oil and stopping the main motor, and finishing the roll gap calibration process.
According to the combination of the third step and the fourth step, the closing speed of the second section of roll gap is reduced to 0.8mm/s from 1.5mm/s by the aid of the two-section speed in the closing process of the upper and lower roll systems of the rolling mill, so that the impact force at the moment of contact of the upper and lower roll systems can be reduced.
In the process of closing the roll gap, the working roll rotates at a low speed of 20m/min and is in dynamic contact under the lubricating and cooling effects of rolling oil, so that the surface of the roll is prevented from being damaged due to local stress in the process. The method effectively avoids the transverse roll mark generated in the static pressing process of the roller, prolongs the service life of the roller, and improves the production efficiency and the product quality.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. A roll gap calibration control method of a large six-roll CVC cold rolling mill is characterized by comprising the following steps:
firstly, after a roller is replaced, firstly, opening the roller gap to the maximum position, and when a proximity switch positioned at the top of a rack senses the retraction position of an RGC cylinder, setting a rough initial position value for the roller gap by a control system to finish the pre-calibration of the roller gap;
secondly, pressing a roll gap calibration button and starting a roll gap calibration sequence control program under the condition of meeting the roll gap calibration condition;
thirdly, judging the position of a roll gap; if the position of the roll gap is more than 10mm, closing the roll gap to the position of 10mm, and when the position deviation and the inclination deviation are within an allowable range, opening rolling oil and enabling the roll to rotate at the linear speed of 20 m/min; if the position of the roll gap is less than 10mm, directly opening rolling oil, and enabling the roll to rotate at the linear speed of 20 m/min;
fourthly, when the rolling oil is opened and the linear velocity of the roller is not zero, switching to a rolling force control mode, and then closing the roller gap to the minimum rolling force of 500 KN;
fifthly, continuously increasing the unilateral rolling force to 300KN, so that the roller rotates at the linear speed of 30 m/min; if the CVC shifting roller is not at the calibration position, the roller shifting is carried out after the rotating speed of the roller is increased to 200 m/min; when the CVC roll shifting position is zero, reducing the rotating speed of the roller to 30 m/min;
sixthly, when the unilateral rolling force reaches 300KN, the rolling oil is turned on and the CVC cold rolling mill is in a pre-calibration position, the unilateral rolling force is increased to 2500KN, and roll bending values of a working roll and a middle roll are set to be 20%;
seventhly, when the unilateral rolling force reaches 2500KN and the roll bending value reaches 20%, judging that the unilateral rolling force fluctuation does not exceed 100KN and the change of the inclination value in three scanning periods does not exceed 5 micrometers, and sending a roll gap calibration command; at the moment, the roll gap position is set to be 0, namely the accurate roll gap zero position;
eighthly, reducing the rotating speed of the roller to 20m/min, and opening the roller gap to reach the minimum rolling force;
ninth, opening the roll gap to a position of 10mm, then closing the rolling oil and turning off the main motor, and finishing the roll gap calibration process;
in the third step, when the roll gap is closed, the speed of closing the roll gap is 1.5 mm/s;
and in the fourth step, when the roll gap is closed, the speed of closing the roll gap is 0.8 mm/s.
2. The roll gap calibration control method of the large six-roll CVC cold rolling mill according to claim 1, characterized in that: the condition meeting the roll gap calibration condition in the second step means that the high-pressure system is normal, the machine frame area does not stop, and the roll gap is calibrated in advance.
3. The roll gap calibration control method of the large six-roll CVC cold rolling mill according to claim 1, characterized in that: in the ninth step, the linear speed of the roll is controlled to be lower than 30m/min in the process of opening the roll gap to the position of 10 mm.
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| CN202010914548.2A CN112170504B (en) | 2020-09-03 | 2020-09-03 | Roll gap calibration control method of large six-roll CVC cold rolling mill |
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| CN202010914548.2A CN112170504B (en) | 2020-09-03 | 2020-09-03 | Roll gap calibration control method of large six-roll CVC cold rolling mill |
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| JPH11319929A (en) * | 1998-05-21 | 1999-11-24 | Nkk Corp | Control method and its device for roll gap of rolling mill |
| CN1091009C (en) * | 1999-11-30 | 2002-09-18 | 宝山钢铁股份有限公司 | Zero correction method for tandem mill with band steel down-pressing position |
| CN100518975C (en) * | 2007-08-07 | 2009-07-29 | 攀枝花新钢钒股份有限公司 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
| CN101318202A (en) * | 2008-06-26 | 2008-12-10 | 湖南华菱涟源钢铁有限公司 | Zero positioning method for roller gap of stand-alone frame of roller mill |
| CN102553944B (en) * | 2012-02-20 | 2014-06-04 | 首钢京唐钢铁联合有限责任公司 | Calibration method for roller gaps of rolling machine |
| CN107583958B (en) * | 2017-09-01 | 2018-12-18 | 中铝瑞闽股份有限公司 | It is a kind of to realize that aluminum cold-rolling mill leans on zero control method automatically using roller diameter difference |
| CN107583961B (en) * | 2017-10-16 | 2018-11-16 | 辽宁科技大学 | A kind of cold continuous rolling is without strip roll gap calibration control method |
| CN108994091B (en) * | 2018-07-19 | 2019-10-01 | 本钢板材股份有限公司 | A kind of cold-rolling mill closes the scaling method of seam print |
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