CN108787757B - Dynamic control method for roll gap of vertical roll in thick plate rolling production - Google Patents
Dynamic control method for roll gap of vertical roll in thick plate rolling production Download PDFInfo
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Abstract
The invention relates to a dynamic control method of vertical roll gap in thick plate rolling production, which formulates a vertical roll use strategy, performs vertical roll gap compensation on a rolling stage and a rolling pass which need to use a vertical roll, and dynamically controls the vertical roll gap by dividing roll gap control points. According to the invention, different vertical roll gap control strategies are set for the head and the tail of the steel plate in the vertical roll pass, so that the dynamic control of the vertical roll gap is realized, the head and tail width precision of the steel plate is effectively improved, the head and tail width precision and the plane shape of the steel plate are greatly improved, and the problem of the ultra-wide head and tail width of the steel plate caused by the existing thick plate rolling method is solved.
Description
Technical Field
The invention relates to the field of thick plate rolling production control, in particular to a dynamic control method for a roll gap of a vertical roll in thick plate rolling production.
Background
In the thick plate rolling production process, a vertical rolling mill is important equipment for controlling the plane shape and the size of a finished steel plate, and particularly, the vertical rolling mill and a roughing mill are combined for use, so that the width of the steel plate after the widening stage can be effectively controlled, and the aim of accurately controlling the width of the finished steel plate is fulfilled.
In the current thick plate production process, the planar shape of a plate blank needs to be controlled in the forming or/and widening stage, so that the thickness of the steel plate in the widening stage tends to be thick at the edge part and thin in the middle in the width direction, and the situation of the thick at the edge part of the middle blank is further aggravated after a vertical roll is used. In the subsequent finish rolling stage, the intermediate billet is only extruded in the thickness direction, and the material continuously flows backwards to cause the final expansion of the head and the tail of the steel plate, so that the phenomenon of super-wide head and tail width is generated.
In patent No. CN201110005594.1[ method for controlling opening degree of rough rolling edger when rolling tapered slab ], the method is mainly characterized by comprising the following steps: 1. dividing the plate blank into three sections, namely a head parallel section, a middle inclined section and a tail parallel section, wherein the width of the head parallel section is greater than that of the tail parallel section; 2. reading original data of the slab, wherein the data comprises the head width of the slab, the tail width of the slab, the thickness of the slab, the total length of the slab, the length of a head parallel segment and the length of a middle inclined segment, and calculating to obtain the slope of the middle inclined segment; 3. determining a slab shape equation according to slab original data, wherein the slab is in an axial symmetry shape, the vertex angle of a parallel section at the tail of the slab is taken as a coordinate origin, the axial direction of the slab is taken as an X axis, and the radial direction of the slab is taken as a Y axis, and determining a single-side outline equation of the slab; 4. selecting a plurality of characteristic points at equal intervals in the axial direction of the slab, and then calculating according to a formula to obtain slab characteristic point coordinates; 5. and setting various parameters during rolling in the current pass according to the calculated characteristic point coordinates of the plate blank, wherein the parameters comprise the opening degree of an inlet vertical roll, the opening degree of an outlet vertical roll and the horizontal reduction, then calculating the width reduction, the width of the head of the rolled plate blank and the width of the tail of the rolled plate blank, and finishing the opening degree setting of a rough rolling vertical roll mill when the tapered plate blank is rolled. According to the control method for the opening degree of the vertical rolling mill, the set value of the opening degree of the vertical roll in the process that the conical blanks in various shapes pass through the vertical roll is accurately calculated, so that the quality precision of the finished products rolled by the conical blanks is not different from that of the finished products rolled by normal plate blanks.
In patent No. CN201210579237.0[ a rough rolling vertical roll short stroke quadratic curve control method ], the main features include vertical roll head short stroke control and vertical roll tail short stroke control, and the vertical roll head short stroke control mode is: when a short stroke that a rolled piece enters the head of a rolling mill is detected, a PLC enables a roll gap to reach a short-stroke maximum opening degree according to the maximum variation G of the roll gap of a vertical roll and wait for the rolled piece to enter, the PLC integrates according to the speed of the vertical roll or a flat roll, the influence of factors such as forward slip is considered, the head of the rolled piece is tracked, the length X of the rolled piece entering the vertical roll is calculated, the PLC calculates the real-time roll gap correction Y of the vertical roll according to a quadratic curve equation along with the progress of rolling, the opening degree of the roll gap is adjusted in real time, the roll gap is gradually reduced along with the entrance of the rolled piece in a quadratic curve shape from large to small, when the length X of the rolled piece biting into the vertical roll is equal to the short stroke length L of the head, the roll gap correction Y of the vertical roll is equal to; the short stroke control mode of the tail part of the vertical roll is as follows: when the fact that a rolled piece enters a short tail stroke of a vertical roll of a rolling mill is detected, the PLC tracks the tail of the rolled piece, the length X of the rolled piece entering the short tail stroke of the vertical roll is calculated, along with the rolling, the PLC calculates a real-time roll gap correction Y of the vertical roll according to a quadratic curve equation, the roll gap opening degree is adjusted in real time, the roll gap gradually increases along with the outgoing of the rolled piece in a quadratic curve shape from small to large, when the length X of the rolled piece biting into the vertical roll is equal to the short tail stroke length L, the roll gap correction Y of the vertical roll is equal to 0, and the short tail stroke is finished. The method can effectively reduce errors generated in a fold line mode, more accurately control the change of the head and tail shapes of the rolled piece and improve the precision of short-stroke control.
By analyzing the above search materials, in CN201110005594.1[ method for controlling opening degree of rough rolling edger when rolling a conical slab ], the set value of opening degree of the edger during passing the conical slab of each shape through the edger is accurately calculated, so that the quality precision of the finished product rolled by the conical slab is not different from that of the finished product rolled by a normal slab, in CN201210579237.0[ a rough rolling vertical roll short-stroke quadratic curve control method ] through vertical roll head-to-tail short-stroke control, errors generated in a broken line mode are effectively reduced, changes of the head-to-tail shapes of rolled pieces are more accurately controlled, and the precision of short-stroke control is improved, but in the process of rolling thick plates and steel plates, because the planar shape of the plate blank needs to be controlled in the forming or/and widening stage, the thickness of the steel plate after the widening stage tends to be thick at the edge part and thin in the middle in the width direction, and the situation of the thick at the edge part of the steel plate is further aggravated after the vertical roller is used. In the subsequent finish rolling stage, because the steel plate is only extruded in the thickness direction, the material continuously flows backwards to cause the final expansion at the head and the tail of the steel plate, thereby generating the phenomenon of super-wide head and tail width. The method disclosed in the above patent cannot effectively solve the problem that the steel plate is ultra-wide at the head and the tail.
Disclosure of Invention
The invention aims to provide a dynamic control method of vertical roll gaps in thick plate rolling production, which sets different vertical roll gap control strategies for the head and the tail of a steel plate in vertical roll passes, realizes the dynamic control of the vertical roll gaps, effectively improves the head and tail width precision of the steel plate, greatly improves the head and tail width precision and the plane shape of the steel plate and is used for solving the problem of the ultra-wide head and tail width of the steel plate caused by the traditional thick plate rolling method.
In order to achieve the purpose, the scheme of the invention is as follows: a dynamic control method for a roll gap of a vertical roll in thick plate rolling production comprises the following steps:
(1) setting a rolling stage and rolling passes according to the specifications of an incoming slab and a target steel plate, and simultaneously setting a vertical roll use strategy in the steel plate rolling process, namely the rolling stage and the rolling passes of a vertical roll in the steel plate rolling process;
(2) acquiring the current rolling stage and rolling pass in real time, and calculating the roll gap correction amount of the vertical roll for the rolling stage and rolling pass needing to use the vertical roll according to the vertical roll use strategy formulated in the step (1);
(3) dividing 3 roll gap control points in the length direction of the steel plate, and calculating the roll gap value of the vertical roll at each roll gap control point according to the roll gap correction obtained in the step (2), wherein the 3 roll gap control points are respectively positioned at a steel biting position, a roll gap change starting position and a steel throwing position;
(4) and sending the position and the roll gap value of each roll gap control point to an electric actuating mechanism, and dynamically controlling the roll gap of the vertical roll in the steel plate rolling process by the electric actuating mechanism until the whole steel plate is rolled.
Further, according to the dynamic control method of the vertical roll gap in the heavy plate rolling production of the present invention, the use strategy of the vertical roll is as follows: when the rolling of the steel sheet is finished with the profile rolling in the rough rolling stage, it is necessary to use the vertical rolls in the final pass of the rough rolling stage; when the rolling of the steel plate is finished by widening rolling in a rough rolling stage and the last pass is not post-rolling steel, a vertical roller is required to be used in the last pass of the rough rolling stage; when the rolling of the steel sheet is completed in the finish rolling stage, it is necessary to use a vertical roll in the final pass of the finish rolling stage.
Further, according to the dynamic control method for the vertical roll gap in the heavy plate rolling production of the present invention, in the step (3), an additional roll gap control point is divided between the roll gap start change position and the steel throwing position.
Further, according to the dynamic control method of the vertical roll gap in the slab rolling production of the present invention, in the step (3), an additional roll gap control point is selected at 1/4, 1/2 or 3/4 between the roll gap start change position and the cast steel position.
Further, according to the dynamic control method of the vertical roll gap in the heavy plate rolling production of the present invention, in the step (4), the roll gap value at each roll gap control point is
Wherein g represents a vertical roll gap; gsIndicating a set roll gap; gxIndicating a roll gap correction; l isdRepresenting the current rolling position of the steel plate; l isyIndicating a steel biting position; l represents the length of the steel plate; k represents the position where the roll gap of the vertical roll begins to change, and the value of k is 0.8-0.95.
Further, according to the dynamic control method for the roll gap of the vertical roll in the thick plate rolling production of the present invention, the roll gap correction amount is:
wherein d represents the roll gap correction amount of the steel throwing position, and the value of d is 20-60 mm.
The invention achieves the following beneficial effects: according to the invention, different vertical roll gap control strategies are set for the head and the tail of the steel plate in vertical roll passes, so that the dynamic control of the vertical roll gap is realized, the head and tail width precision of the steel plate is effectively improved, the head and tail width precision and the plane shape of the steel plate are greatly improved, and the quality of finished products is effectively improved.
Drawings
FIG. 1 is a schematic flow chart of a control method of the present invention;
FIG. 2 is a schematic view of the dynamic setting of the roll gap linear control of the vertical rolls of the present invention;
FIG. 3 is a schematic diagram of the dynamic setting of the vertical roll gap quadratic curve control of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The control method of the invention comprises the following steps:
(1) setting a rolling stage and rolling passes according to the specifications of an incoming slab and a target steel plate, and simultaneously setting a vertical roll use strategy in the steel plate rolling process, namely the rolling stage and the rolling passes of a vertical roll in the steel plate rolling process;
(2) acquiring the current rolling stage and rolling pass in real time, and calculating the roll gap correction amount of the vertical roll for the rolling stage and rolling pass needing to use the vertical roll according to the vertical roll use strategy formulated in the step (1);
(3) dividing 3 roll gap control points in the length direction of the steel plate, and calculating the roll gap value of the vertical roll at each roll gap control point according to the roll gap correction obtained in the step (2), wherein the 3 roll gap control points are respectively positioned at a steel biting position, a roll gap change starting position and a steel throwing position;
(4) and sending the position and the roll gap value of each roll gap control point to an electric actuating mechanism, and dynamically controlling the roll gap of the vertical roll in the steel plate rolling process by the electric actuating mechanism until the whole steel plate is rolled.
The method specifically comprises the following steps:
strategy for using vertical roll in steel plate rolling process
In order to ensure the stability of the vertical rolls biting the steel plate, the vertical rolls are not generally adopted to control the width of the portion, which is just bitten by the steel plate, so that the vertical rolls are responsible for controlling the width of the tail portion of the steel plate in the forward pass; and in the reverse pass, the vertical roller is responsible for controlling the width of the head of the steel plate. As long as the roughing stage of the steel sheet does not end with post-mill steel transfer, it is necessary to use vertical rolls in the last pass of the roughing. If the penultimate or third-to-last pass of the rolling is the finishing stage, vertical rolls may be used in these passes to ensure better accuracy of the head-to-tail width of the steel sheet.
The strategy for using the rough rolling vertical rolls is that when the rolling of the steel plate is finished by the forming rolling in the rough rolling stage, the vertical rolls must be used in the last pass of the rough rolling stage; when the rolling of the steel plate is finished by widening rolling in a rough rolling stage and the last pass is not post-rolling steel, a vertical roller is required to be used in the last pass of the rough rolling stage; when the rolling of the steel sheet is completed with the finish rolling stage, it is necessary to use the vertical rolls in the last pass of the rough rolling stage, and the vertical rolls may be used in the penultimate and third passes.
2, vertical roll gap compensation
The ultra-wide phenomenon generated near the steel plate steel throwing position due to continuous backward flowing of the material can be compensated through vertical roll gap correction, and the width of the steel plate can be effectively controlled by properly reducing the vertical roll gap at the steel plate steel throwing position, as shown in figure 1.
Setting a vertical roll gap value, calculating the roll gap correction amount of the vertical roll, and performing correction compensation on the vertical roll gap:
wherein, gxIndicating a roll gap correction; gsIndicating a set roll gap; g represents a vertical roll gap; l isdRepresenting the current rolling position of the steel plate; l isyIndicating a steel biting position; l represents the length of the steel plate; k represents the position where the roll gap of the vertical roll begins to change, and the value of k is 0.8-0.95; d represents the roll gap correction amount of the steel throwing position, and the value is 20-60 mm.
3, dynamic setting of vertical roll gap
Dividing roll gap control points in the length direction of the steel plate, sending the positions and roll gap values of the control points to an electric actuator, and only dividing 3 roll gap control points in the length direction of the steel plate for linear vertical roll gap dynamic control, namely 1# at a steel biting position, 2# at a roll gap starting change position and 3# at a steel throwing position, as shown in fig. 2.
In order to improve the accuracy of control, a quadratic curve control can also be adopted, for the vertical roll gap dynamic control of the quadratic curve, 1-3 control points are required to be specified between the roll gap starting change position 2# and the steel throwing position 3#, and the general positions are set to 1/4, 1/2 or 3/4 between the roll gap starting change position 2# and the steel throwing position 3#, wherein 4# at 1/2 is most commonly used, as shown in fig. 3.
Two specific examples of applications are presented below:
example 1 takes a 5m production line rolling line of a thick plate part of a Bao steel strand as an example:
the thickness of a certain plate blank is 250mm, the width is 1900mm, the length is 3800mm, the thickness of a finished steel plate is 18mm, the width is 2500mm, the length is 38000mm, the target length in the rough rolling stage is 9400mm, the rolling of the steel plate comprises 9 passes, wherein the number of the passes in the rough rolling forming stage is 1, the number of the passes in the rough rolling widening stage is 4, the number of the passes in the finish rolling stage is 4, and the last pass is a blank pass, so that a vertical roll must be used in the last pass, the roll gap of the vertical roll is set to be 2560mm, and the rolling pass is set.
And selecting a vertical roll gap linear control mode for control, wherein k is 0.9, and the correction amount of the vertical roll at the steel throwing position is 40 mm.
The position of the control point 1# is 0mm and the roll gap of the vertical roll is 2560mm as shown in figure 2
The position of a control point No. 2 is 8460mm, and the roll gap of the vertical roll is 2560mm
The position of a control point 3# is 9400mm, and the roll gap of the vertical roll is 2520mm
TABLE 1 Rolling pass setting Table
Example 2 takes a production line of a thick plate part 5m of a Bao steel strand as an example:
the thickness of a certain plate blank is 145mm, the width is 1300mm, the length is 2900mm, the thickness of a finished steel plate is 25mm, the width is 2360mm, the length is 8500mm, the target length of a rough rolling stage is 3330mm, the rough rolling stage comprises 7 passes, wherein 4 passes of a forming stage, 3 passes of a widening stage and the last pass are idle passes, so that an upright roll is required to be used in the last pass of the rough rolling, the roll gap of the upright roll is set to be 2323mm, and the rough rolling pass is set as shown in table 2.
And selecting a roll gap secondary curve control mode of the vertical roll for control, wherein k is 0.95, and the correction amount of the vertical roll at the steel throwing position is 30 mm.
The position of the control point 1# is 0mm and the roll gap of the vertical roll is 2323mm as shown in figure 3
The position of a control point 2# is 3163.5mm, and the roll gap of the vertical roll is 2323mm
The position of a control point 3# is 3330mm, and the roll gap of the vertical roll is 2293mm
The position of a control point No. 4 is 3246.75mm, and the roll gap of the vertical roll is 2300.5mm
TABLE 2 setting table for the pass of rough rolling
According to the invention, different vertical roll gap control strategies are set for the head and the tail of the steel plate in vertical roll passes, so that the dynamic control of the vertical roll gap is realized, the head and tail width precision of the steel plate is effectively improved, the head and tail width precision and the plane shape of the steel plate are greatly improved, and the quality of finished products is effectively improved.
Claims (6)
1. A dynamic control method for a roll gap of a vertical roll in thick plate rolling production is characterized in that: the dynamic control method comprises the following steps:
(1) setting a rolling stage and rolling passes according to the specifications of an incoming slab and a target steel plate, and simultaneously setting a vertical roll use strategy in the steel plate rolling process, namely the rolling stage and the rolling passes of a vertical roll in the steel plate rolling process;
(2) acquiring the current rolling stage and rolling pass in real time, and calculating the roll gap correction amount of the vertical roll for the rolling stage and rolling pass needing to use the vertical roll according to the vertical roll use strategy formulated in the step (1);
(3) dividing 3 roll gap control points in the length direction of the steel plate, and calculating the roll gap value of the vertical roll at each roll gap control point according to the roll gap correction obtained in the step (2), wherein the 3 roll gap control points are respectively positioned at a steel biting position, a roll gap change starting position and a steel throwing position;
(4) and sending the position and the roll gap value of each roll gap control point to an electric actuating mechanism, and dynamically controlling the roll gap of the vertical roll in the steel plate rolling process by the electric actuating mechanism until the whole steel plate is rolled.
2. The method for dynamically controlling the roll gap of the vertical roll in the heavy plate rolling production according to claim 1, wherein the use strategy of the vertical roll is as follows: when the rolling of the steel sheet is finished with the profile rolling in the rough rolling stage, it is necessary to use the vertical rolls in the final pass of the rough rolling stage; when the rolling of the steel plate is finished by widening rolling in a rough rolling stage and the last pass is not post-rolling steel, a vertical roller is required to be used in the last pass of the rough rolling stage; when the rolling of the steel sheet is completed in the finish rolling stage, it is necessary to use a vertical roll in the final pass of the finish rolling stage.
3. The method for dynamically controlling the roll gap of the vertical roll in the heavy plate rolling production according to claim 1, wherein in the step (3), an additional roll gap control point is divided between the roll gap start change position and the steel throwing position.
4. The method for dynamically controlling vertical roll gap in the rolling production of thick plate according to claim 3, wherein in the step (3), an additional roll gap control point is selected at 1/4, 1/2 or 3/4 between the roll gap start change position and the cast steel position.
5. The method for dynamically controlling the roll gap of the vertical roll in the heavy plate rolling production according to claim 1, wherein in the step (3), the roll gap value at each roll gap control point is
Wherein g represents a vertical roll gap; gsIndicating a set roll gap; gxIndicating a roll gap correction; l isdRepresenting the current rolling position of the steel plate; l isyIndicating a steel biting position; l represents the length of the steel plate; k represents the position where the roll gap of the vertical roll begins to change, and the value of k is 0.8-0.95.
6. The method for dynamically controlling the roll gap of the vertical roll in the heavy plate rolling production according to claim 5, wherein the roll gap correction amount is:
wherein d represents the roll gap correction amount of the steel throwing position, and the value of d is 20-60 mm.
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| CN102814340B (en) * | 2011-06-08 | 2014-07-09 | 鞍钢股份有限公司 | Intelligent learning system and self-learning method for hot-rolled strip steel width control model |
| CN102921740B (en) * | 2011-08-09 | 2015-03-04 | 宝山钢铁股份有限公司 | Method for controlling width deviation of head and tail of hot rolled strip |
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| CN104249084B (en) * | 2014-09-26 | 2016-06-01 | 成都金自天正智能控制有限公司 | A kind of method improving band steel portion's width accuracy end to end when hot continuous rolling is produced |
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