CN112893475A - Control method for buckling end of plate blank - Google Patents
Control method for buckling end of plate blank Download PDFInfo
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- CN112893475A CN112893475A CN202110030501.4A CN202110030501A CN112893475A CN 112893475 A CN112893475 A CN 112893475A CN 202110030501 A CN202110030501 A CN 202110030501A CN 112893475 A CN112893475 A CN 112893475A
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- slab
- load balance
- roughing mill
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- warping
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000002436 steel type Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for controlling a warping head of a slab, which comprises the following steps: judging whether the slab has warped end and buckled end; when the end warping of the slab occurs, carrying out load balance compensation on the upper roller of the roughing mill; and when the slab has a buckle head, carrying out load balance compensation on the lower roller of the roughing mill. The control method for the slab buckling and warping head can control the buckling and warping head in slab rolling, avoids the buckling and warping head of the slab, improves the rolling quality of the strip steel, and ensures the safe and stable operation of a rolling production line.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for controlling a buckling head of a plate blank.
Background
The slab warping refers to the phenomenon that a strip steel slab warps upwards after exiting a rolling mill roll gap in the rolling process of strip steel, and the slab buckling refers to the phenomenon that the strip steel slab warps downwards after exiting the rolling mill roll gap in the rolling process of the strip steel. In the actual rolling production process, the warping and the buckling are frequently generated in a rough rolling rack for producing hot rolled strip steel, when the slab is warped, the downstream rack is difficult to bite if the slab is light, and the downstream rack cannot bite but scrap steel if the slab is heavy; and the slab with the warped end can cause collision to equipment, thereby causing production accidents.
Therefore, the development of a method for controlling the buckling and warping of the slab in the slab rolling becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for controlling the buckling and warping of a slab, which can control the buckling and warping in slab rolling and relieve the buckling and warping problems of the slab.
Therefore, the invention discloses a control method for a warping head of a slab, which comprises the following steps:
judging whether the slab has warped end and buckled end;
when the end warping of the slab occurs, carrying out load balance compensation on the upper roller of the roughing mill;
and when the slab has a buckle head, carrying out load balance compensation on the lower roller of the roughing mill.
In some optional embodiments, when the load balance compensation is performed on the upper roll of the roughing mill, the load balance value can be 90% -110%.
In some alternative embodiments, the load balancing value may be 90% to 110% when load balancing compensation is performed on the roughing mill lower roll.
In some alternative embodiments, the load balancing control of the top roll of the roughing mill is performed 0.5 seconds after the speed balancing control is finished.
In some alternative embodiments, the load balancing control of the roughing mill lower roll is performed 0.5 seconds after the speed balancing control is finished.
In some optional embodiments, the control method further comprises:
recording the optimal load balance value of each steel type during rough rolling, and constructing a parameter table comprising information of all steel types and the optimal load balance value corresponding to each steel type based on the optimal load balance value;
and in the rolling process, automatically calling the optimal load balance value of the parameter table according to the steel type of the rolled strip steel to perform load balance control on the roughing mill.
The technical scheme of the invention has the following main advantages:
the control method for the slab buckling and warping head can control the buckling and warping head in slab rolling, avoids the buckling and warping head of the slab, improves the rolling quality of the strip steel, and ensures the safe and stable operation of a rolling production line.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. On the attachment
In the figure:
fig. 1 is a flowchart of a method for controlling a warp of a slab according to an embodiment of the present invention;
FIG. 2 is an electrical schematic of a mill main drive control system according to an embodiment of the present invention;
FIG. 3 is an electrical schematic diagram of a mill load balancing control system in accordance with an embodiment of the present invention;
FIG. 4 is a timing diagram of the speed balance control and the load balance control according to an embodiment 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 clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a method for controlling a warp of a slab buckle, including:
judging whether the slab has warped end and buckled end;
when the end warping of the slab occurs, carrying out load balance compensation on the upper roller of the roughing mill;
and when the slab has a buckle head, carrying out load balance compensation on the lower roller of the roughing mill.
The following is a detailed description of the steps and principles of the method for controlling a warp of a slab according to an embodiment of the present invention.
Specifically, in the rolling production process of the strip steel, load balance compensation control is carried out on an upper roller and a lower roller of a roughing mill according to the warping and buckling conditions of a strip steel plate blank, when the warping occurs on the strip steel plate blank, load balance compensation is carried out on the upper roller of the roughing mill, so that the actual torque of the upper roller of the roughing mill and the roller speed difference of the upper roller and the lower roller are controlled, and the problem of warping of the plate blank is solved; when the head of the steel strip slab is buckled, the lower roll of the roughing mill is subjected to load balance compensation so as to control the actual torque of the lower roll of the roughing mill and the roll speed difference of the upper roll and the lower roll, thereby relieving the problem of the head of the steel strip slab.
In the rolling production process of strip steel, the control of the rotating speed and the torque of the rolling mill rolls is realized by a rolling mill main transmission control system, referring to fig. 2 and fig. 3, the rolling mill main transmission control system is a double closed loop control system consisting of a speed outer loop and a torque inner loop, the speed outer loop is a speed regulator and is usually completed by a Proportional Integral (PI) controller, the input quantity of the proportional integral controller is the deviation between a speed set value and an actual value, and the output is a speed regulation torque value. In the actual control process, the difference value of the actual torque of the upper roller and the actual torque of the lower roller is multiplied by a proportional integral coefficient and then is superposed to the speed giving of the upper roller, so that the speed difference of the upper roller and the lower roller can be adjusted by carrying out load balance compensation on the upper roller, and the buckling state of the plate blank is adjusted and controlled.
Further, in an embodiment of the present invention, when the load balance compensation is performed on the upper roll of the roughing mill, the load balance value may be 90% to 110%; when the lower roll of the roughing mill is subjected to load balance compensation, the load balance value can be 90-110%.
Specifically, the specific numerical value of the load balance value can be adjusted and determined according to the actual warping angle and the actual buckle angle of the slab.
Further, in an embodiment of the present invention, the load balance control of the upper roll of the roughing mill and the lower roll of the roughing mill is performed 0.5 seconds after the speed balance control is finished.
In the rough rolling process of the strip steel, the speed control comprises a speed balance control part and a load balance control part, and the speed balance control and the load balance control are both realized by utilizing a main transmission control system of the rolling mill. Referring to fig. 4, in one embodiment of the present invention, the speed balance control is input before the roughing mill bites steel, and ends after biting steel for a certain length, for example, 2 mm. The load balance control is started 0.5 second after the speed balance control is finished until the load relay is turned OFF, and when the load balance control is carried out, the load balance control can be realized by inputting a load balance value in the upper computer.
Further, in an embodiment of the present invention, the control method further includes: recording the optimal load balance value of each steel type during rough rolling, and constructing a parameter table comprising information of all steel types and the optimal load balance value corresponding to each steel type based on the optimal load balance value;
and in the rolling process, automatically calling the optimal load balance value of the parameter table according to the steel type of the rolled strip steel to perform load balance control on the roughing mill.
The optimal load balance value refers to that when the optimal load balance value is used for carrying out load balance control on the roughing mill, the times of warping and buckling of the plate blank are minimum or warping and buckling are not generated.
The influencing factors of the slab buckle include the material, the surface state, the thickness of the strip steel, the width of the strip steel, the temperature difference in the thickness direction of the strip steel, the speed difference of an upper roller and a lower roller and the like. The rolling main transmission control system automatically adjusts the load balance value of load balance control according to the parameter table in the subsequent rolling process of the strip steel by recording the optimal load balance value of each steel type during rolling in the previous rolling process and constructing the parameter table comprising all steel type information and the optimal load balance value corresponding to each steel type, so that the problem of warping of a plate blank can be relieved, and the automatic control of strip steel rolling can be realized.
The method for controlling the buckling and warping of the slab, provided by the embodiment of the invention, can control the buckling and warping of the slab during rolling, so that the buckling and warping of the slab are avoided, the rolling quality of the strip steel is improved, and the safe and stable operation of a rolling production line is ensured.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method of controlling a warp of a slab, the method comprising:
judging whether the slab has warped end and buckled end;
when the end warping of the slab occurs, carrying out load balance compensation on the upper roller of the roughing mill;
and when the slab has a buckle head, carrying out load balance compensation on the lower roller of the roughing mill.
2. The method for controlling a warp of a slab as claimed in claim 1, wherein the load balance value is 90-110% when the load balance compensation is performed on the upper roll of the roughing mill.
3. The method for controlling a warp of a slab as claimed in claim 1, wherein the load balance value is 90-110% when the load balance compensation is performed on the lower roll of the roughing mill.
4. The method for controlling a warp of a slab as set forth in claim 1, wherein the load balance control of the upper roll of the roughing mill is performed 0.5 seconds after the speed balance control is finished.
5. The method as claimed in claim 1, wherein the load balancing control of the lower roll of the roughing mill is performed 0.5 seconds after the speed balancing control is finished.
6. The method for controlling a warp of a slab as claimed in claim 1, further comprising:
recording the optimal load balance value of each steel type during rough rolling, and constructing a parameter table comprising information of all steel types and the optimal load balance value corresponding to each steel type based on the optimal load balance value;
and in the rolling process, automatically calling the optimal load balance value of the parameter table according to the steel type of the rolled strip steel to perform load balance control on the roughing mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030501.4A CN112893475A (en) | 2021-01-11 | 2021-01-11 | Control method for buckling end of plate blank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110030501.4A CN112893475A (en) | 2021-01-11 | 2021-01-11 | Control method for buckling end of plate blank |
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| CN112893475A true CN112893475A (en) | 2021-06-04 |
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| CN202110030501.4A Pending CN112893475A (en) | 2021-01-11 | 2021-01-11 | Control method for buckling end of plate blank |
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Citations (12)
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|---|---|---|---|---|
| US5874813A (en) * | 1996-08-17 | 1999-02-23 | Sms Schloemann-Siemag Ag | Control method, especially for load balancing of a plurality of electromotor drives |
| JPH11277121A (en) * | 1998-03-30 | 1999-10-12 | Nisshin Steel Co Ltd | Device for horizontally displacing work roll of roughing mill and method for controlling rolling mill using the device |
| JP2003275810A (en) * | 2002-03-19 | 2003-09-30 | Nippon Steel Corp | Method for preventing warpage in rolling or metallic sheet |
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| JP2010188384A (en) * | 2009-02-19 | 2010-09-02 | Nisshin Steel Co Ltd | Method for controlling warpage of tip of hot bar |
| CN102366761A (en) * | 2011-09-16 | 2012-03-07 | 山西太钢不锈钢股份有限公司 | Method for preventing end curling of hot-rolled stainless steel |
| CN102744267A (en) * | 2012-06-20 | 2012-10-24 | 北京景新电气技术开发有限责任公司 | Motor load distribution control method and motor load distribution control device |
| CN104624665A (en) * | 2015-01-09 | 2015-05-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling rough rolling squat in continuous hot rolling strip |
| CN108838216A (en) * | 2018-06-29 | 2018-11-20 | 首钢京唐钢铁联合有限责任公司 | Control method for raising head of plate blank |
| CN110893419A (en) * | 2019-12-05 | 2020-03-20 | 张家港宏昌钢板有限公司 | Control method for raising and buckling head of heavy and medium plate mill |
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2021
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| JP2003275810A (en) * | 2002-03-19 | 2003-09-30 | Nippon Steel Corp | Method for preventing warpage in rolling or metallic sheet |
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| US20100031723A1 (en) * | 2006-12-18 | 2010-02-11 | Wolfgang Hofer | Rolling method for a strip |
| CN101161362A (en) * | 2007-11-23 | 2008-04-16 | 南京钢铁股份有限公司 | Median plate four-high mill single side following type load equalization control method |
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Application publication date: 20210604 |
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