CN110216152B - Control method for improving wedge shape of strip steel rolled in two-phase region - Google Patents
Control method for improving wedge shape of strip steel rolled in two-phase region Download PDFInfo
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B2263/00—Shape of product
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Abstract
The invention discloses a control method for improving the wedge shape of strip steel rolled in a two-phase region, which comprises the following steps: (1) load distribution: by adopting a load distribution mode of reduction rate distribution, under the condition of meeting good plate crown, increasing the rolling force of F1-F4 stands, reducing the rolling force of F5-F7 stands, and gradually reducing the rolling force of the stands from F1 to F7; (2) short stroke control of the guide plate and the vertical roll; (3) convexity value selection range: the strip steel convexity value is the difference value between the central thickness of the strip steel and the average thickness value of the edge part at 40mm, and the convexity range is 27-32 mu m. The wedge-shaped control method solves the technical problem of wedge-shaped control in the two-phase rolling process of CSP process rolling, greatly improves the wedge-shaped precision of the steel, and improves the quality precision of the post-process.
Description
Technical Field
The invention relates to a manufacturing method of strip steel, in particular to a control method for improving the wedge shape of the strip steel rolled in a two-phase region, belonging to the technical field of CSP hot rolling process and strip steel manufacturing of hot rolled strip rolling.
Background
The CSP hot rolled strip steel is one of the main products with market advantages of Wu steel. In recent years, as the automation level and energy saving requirements of industrial users are increased, the requirements on the shape accuracy of the steel plate are becoming more and more severe. In order to meet the increasingly severe market competition, the CSP can only meet the high requirements for the sheet shape accuracy and continuously reduce the cost, so that it is an important development direction in current production to increase the unit rolling quantity and improve the sheet shape control capability.
Due to the technical characteristics of CSP continuous casting and rolling, only a production mode of same-width rolling can be adopted, the mode is difficult to realize 'online grinding roller', the 'box-shaped' abrasion is easily formed on the roller when the strip steel is rolled at the same position of the roller for a long time, the wedge-shaped control is not facilitated, and the roller changing frequency is increased and the roller consumption is increased.
The thickness range of the produced steel is as follows: 2.3-2.8 mm, and the main production process comprises the following steps: desulfurization → converter → argon blowing → LF → continuous casting → soaking furnace → finish rolling → layer cooling → coiling → lower process plant (other plants).
The wedge shape of the strip steel refers to the thickness difference of two sides of the 40mm position of the edge of the strip steel, and the approximate situation of the transverse difference of the strip steel is reflected through the thickness difference, as shown in figure 1. Of course, different measurement points can be selected according to different quality requirements, and the wedge-shaped control range is usually selected to be (-22um, 22 um).
According to market development analysis, the requirement of downstream customers on the quality precision of products is higher and higher, the wedge is one of the main indexes for measuring the steel of the variety, and the quality of the wedge directly influences the quality of finished products, so that the wedge in the hot rolling process is not standard and can only be treated according to waste products. The results show that conventional wedge control means include operational skill, equipment accuracy, and the like.
Chinese patent publication No. CN106607459A, entitled wedge control system and method for hot-rolled strip steel, discloses a wedge control system for hot-rolled strip steel, which uses a temperature meter to detect the transverse temperature distribution of a plate blank, pre-compensates the roll gap of a rolling mill, improves wedge rolling and the final strip steel wedge, and simultaneously improves the hot-rolling stability and the strip shape quality of strip steel products.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a technical parameter for controlling wedge control during two-phase region rolling in a CSP (compact strip production) process, so as to achieve the purpose of meeting the qualified product required by a cold rolling user in the next process.
The invention designs process parameters mainly from three aspects of load distribution, guide plate and vertical roll short stroke control, convexity selection value range and the like so as to achieve the purpose of improving wedge hit rate: firstly, the purpose of reducing the abrasion of a roller is achieved from the aspect of process, and the edge profile of the strip steel is ensured; and secondly, selecting the most appropriate short-stroke opening of the guide plate through calculation of the two-phase region, thereby reducing the generation of accretion and ensuring the centering property of the strip steel. The vertical roller is changed from position control to pressure control, so that the slab is centered and rolled; and thirdly, selecting the most appropriate convexity selection value interval under the condition of meeting the requirements of the next process, and reducing the contradiction between convexity and wedge control.
The specific technical scheme of the invention is as follows:
a control method for improving the wedge shape of a strip rolled in the presence of a two-phase zone, comprising:
(1) load distribution
By adopting a load distribution mode of reduction rate distribution, under the condition of meeting good plate crown, increasing the rolling force of F1-F4 stands, reducing the rolling force of F5-F7 stands, and gradually reducing the rolling force of the stands from F1 to F7;
wherein, during load distribution, the reduction rate range of the control frame is as follows: the device comprises a rack F1, a pressing rate range of 48-52%, a rack F2, a pressing rate range of 51-55%, a rack F3, a pressing rate range of 44-47%, a rack F4, a pressing rate range of 34-37%, a rack F5, a pressing rate range of 24-26%, a rack F6, a pressing rate range of 17-21%, a rack F7, a pressing rate range of 10-14%, and a pressing rate of the rack F2 is greater than or equal to that of the rack F1.
(2) Short stroke control of guide plate and vertical roller
2.1 short stroke control of guide plate
The guide plate short stroke control is that a rack F2 controls the guide plate short stroke to be 10-15 mm, a rack F3 controls the guide plate short stroke to be 15-20 mm, a rack F4 controls the guide plate short stroke to be 30-40 mm, a rack F5 controls the guide plate short stroke to be 30-40 mm, a rack F6 controls the guide plate short stroke to be 35-45 mm, a rack F7 controls the guide plate short stroke to be 40-50 mm;
2.2 changing vertical roll control from position control to pressure control
Controlling the pressure of a vertical roll to be 50-100 KN at 1-3 m of the head of the slab, controlling the pressure of the vertical roll to be 200-300 KN at 27-39 m of the middle of the slab, controlling the pressure of the vertical roll to be 1-3 m of the tail of the slab, and controlling the pressure of the vertical roll to be 200-300 KN;
(3) range of selected convexity values
The strip steel convexity value is the difference value between the central thickness of the strip steel and the average thickness value of the edge part at 40mm, and the convexity range is 22-32 mu m.
The further scheme is as follows:
the convexity is selected to be in the range of 27-32 μm.
The invention changes the original load distribution mode by controlling the load distribution, changes the reduction rate mode into the original load distribution mode, and reduces the rolling force of the F5-F7 frames, thereby increasing the gamma deformation, reducing the phase change and the alpha-Fe deformation, reducing the abrasion of the rollers of the rear section frame, and improving the deviation of the strip steel and the influence of the abrasion of the rollers on the edge outline of the strip steel.
The invention controls the short stroke control of the guide plate and the vertical roll, because the short stroke opening of the guide plate has the function of strip steel on strip steel, the invention is not only beneficial to the centering of the through plate, but also beneficial to the stability of steel throwing, so the invention has certain influence on the wedge shape of the head and the tail of the strip steel, but has little effect on the friction welding benefit with the silicon steel to generate guide plate nodulation, and the opening amplification is not beneficial to the centering of the strip steel, so the invention combines the phase change to formulate the short stroke process. The reason for controlling the side pressure of the vertical roll is that the situation that the slab enters the rolling mill and is not completely centered when the position control is adopted in the design is not favorable for the wedge control (especially the head and tail wedges) of the strip steel.
The invention controls the range of the convexity selection value. The convexity has the same influence on the transverse thickness difference of the post procedure as the wedge, the smaller the convexity is, the more unfavorable the wedge control is, but the larger the convexity has influence on the transverse thickness difference after the post procedure is rolled, so the convexity is required to be improved by adopting a proper control interval to match with the wedge.
Compared with the prior art, the wedge control method solves the technical problem of wedge control in the two-phase rolling process of CSP process rolling, greatly improves the wedge precision of the steel, improves the quality precision of the post-process, and has the following effects:
firstly, the method can be used by the existing equipment and control without modifying the equipment in the implementation process;
the method is suitable for improving the hot rolling wedge precision of the high-silicon low-aluminum hot rolled steel coil;
the method is simple, convenient and easy to operate, and has strong practicability.
The wedge precision is improved from 95.8% to 97.1%, the product quality is improved, and the occurrence amount of waste and defective products is reduced.
Drawings
FIG. 1 is a schematic view of a wedge shape of a strip steel;
FIG. 2 is a schematic view of a rolling force profile;
FIG. 3 is a schematic phase change diagram;
FIG. 4 is a schematic diagram of the arrangement of the Wu Steel CSP production line equipment;
the wedge shape of fig. 5 is not shown.
Detailed Description
FIG. 1 is a schematic diagram of a wedge shape of a strip steel according to the present invention, wherein:
x: the strip is 25,40,50,75,100 and … … mm from the edge position
Y: the strip steel is 5,10,15 mm from the edge part
And OS: the operation side of the strip steel;
and (2) DS: a strip steel transmission side;
h: the thickness of the strip steel;
hx 1: strip thickness at x 1;
wedge (-22um, 22 um): w40 ═ hx40(OS) -hx 40(DS) satisfies-22 um ≦ W40 ≦ 22 um.
As shown in the attached figure 4, the schematic diagram of the Wu steel CSP production line is shown, and the hot rolled strip steel produced according to the production line has the thickness range: 2.3-2.8 mm, and the main production process comprises the following steps: desulfurization → converter → argon blowing → LF → continuous casting → soaking furnace → finish rolling → layer cooling → coiling → lower process plant. A schematic diagram of a CSP production line of the steel for arms comprises a rotary phosphorus removal machine, a pendulum shear, a soaking furnace, an accident shear, a phosphorus removal machine, a vertical roller, a finishing mill group, a laminar flow cooling and a winding. The operation of a particular CSP line is known to those skilled in the art and will not be described in detail herein.
In FIG. 5, the left side shows the side with a larger thickness difference, i.e., a larger wedge shape, which is an instantaneous cross-sectional view; the right is a plot of multiple transients showing a large wedge fluctuation of the entire coil. These are all situations where the wedge fails. Should avoid
The control method for improving the wedge shape of the strip steel rolled in the two-phase region comprises the following steps:
(1) load distribution:
in the rolling process of the steel, the whole rolling force is not large, the original load distribution mode is mainly similar to that of an energy consumption method, the load distribution mode of the reduction ratio distribution is adopted instead of the current production, under the condition of meeting the requirement of good plate crown, the rolling force of F1-F4 racks is increased, and the rolling force of F5-F7 racks is reduced, and the method specifically comprises the following steps: the method is characterized in that the rolling force F1 is 25000-30000KN, the rolling force F2 is 25000-30000KN, the rolling force F3 is 22000-27000KN, the rolling force F4 is 22000-27000KN, the rolling force F5 is 80000-13000KN, the rolling force F6 is 70000-12000KN, and the rolling force F7 is 50000-10000KN, according to an iron-silicon phase diagram and a deformation resistance diagram, the silicon steel starts to be transformed into a phase at the F3 stand, finishes the transformation at the F5 stand, increases the austenite deformation amount under increased pressure before the transformation, reduces the phase transformation amount and the alpha-Fe deformation amount of the refined austenite, reduces the abrasion of the rear roller after the reduction of the rolling force of the rear stand, and then the roller shape is kept more permanent to be beneficial to guarantee the section, and the specific parameters are shown in the following table 1 and the attached figure 2.
TABLE 1 reduction Rate load distribution
(2) Short stroke control of guide plate and vertical roller
2.1, setting the guide plate short stroke control parameters for the opening degree of the side guide plate: SGt ═ B (1+ a) + Bi;
SGt-guide plate opening [ mm ]; b-finished product width [ mm ]; a-coefficient of thermal expansion (about 0.01); bi-manipulated variable [ mm ]. The short stroke of the head, the middle and the tail of the guide plate can be adjusted by an operator, so that the rolling stability is ensured.
As shown in FIG. 3, the starting transformation point is 960-970 ℃, and the strip steel at the starting transformation point is accompanied by reciprocating fluctuation in the deformation process by combining with actual production experience, so that the centering performance of the strip steel is required to be increased by the guide plate short stroke opening when the strip steel does not fluctuate violently.
TABLE 2 short run setting requirements for guide plates
2.2 changing vertical roll control from position control to pressure control
The scheme ensures the lateral pressure of the vertical roll, and the slab is centered and sent into the rolling mill.
TABLE 3 vertical roll control scheme
(3) Range of selected convexity values
The difference between the strip steel convexity value and the wedge value is as follows: the difference between the central thickness and the average thickness at 40mm of the edge. The method reflects the finishing outline of the strip steel, and the smaller the convexity of the strip steel is, the more difficult the wedge-shaped precision of the strip steel is to control; however, the higher the crown is, the more difficult the same thickness difference accuracy after cold rolling is to be ensured.
TABLE 4 convexity selection Range
| Extent of convexity | Accuracy of wedge | Evaluation of the subsequent Process | Control interval of the scheme |
| 32～37um | 97.5％ | Is poor | |
| 27～32um | 97.1％ | Good taste | √ |
| 22～27um | 96.5％ | Good taste | |
| 17-22um | 94.5％ | Is poor | |
| 12～17um | 92.4％ | Is poor |
The effect is as follows: the precision within the wedge control range +/-22 um of the rolled steel grade in the two-phase region is stabilized to be more than or equal to 97.1 percent and reaches the best level in the same industry
The present invention is described in detail below:
the main components of the test steel grades of the following examples in percentage by weight are as follows: c: 0.02-0.005%, Si is more than or equal to 1.56%, Mn: 0.75-0.82%, P is less than or equal to 0.004%, S is less than or equal to 0.005%, Als: 0.02-0.03%.
Example 1
The wedge mean value of this embodiment is 3mm, the full length hit rate is 98.01%, the statistical range is + -22um, and the thickness is 2.55mm.
A method for improving a strip steel with the thickness of 2.55mm by using a CSP process comprises the following steps:
1) the reduction rate load distribution scheme is as follows;
2) short stroke of the guide plate and vertical roll control parameters;
TABLE 2 short run setting requirements for guide plates
3) Convexity target 28um, actual 29 um;
the transverse thickness difference fed back by the post process is better, the 7um precision is 99.56 percent, the 5um precision is 91.15 percent, the wedge mean value of the hot rolling process is 3mm, the full length hit rate is 97.98 percent, and the condition is better.
Example 2
The wedge mean value of this example is 2mm, the full length hit rate is 98.11%, the statistical range is + -22um, the thickness is 2.55mm.
A method for improving a strip steel with the thickness of 2.55mm by using a CSP process comprises the following steps:
1) the reduction rate load distribution scheme is as follows;
2) a guide plate short stroke control parameter;
TABLE 2 short run setting requirements for guide plates
3) Convexity target 29um, actual 29 um;
the transverse thickness difference fed back by the post process is better, the 7um precision is 99.44%, the 5um precision is 90.05%, the wedge mean value of the hot rolling process is 2mm, the full length hit rate is 97.98%, and the situation is better.
Example 3
The wedge mean value of this example is 0mm, the full length hit rate is 99.31%, the statistical range is + -22um, and the thickness is 2.55mm.
A method for improving a strip steel with the thickness of 2.55mm by using a CSP process comprises the following steps:
1) the reduction rate load distribution scheme is as follows;
2) a guide plate short stroke control parameter;
TABLE 2 short run setting requirements for guide plates
3) Convexity target 27um, actual 27 um;
the transverse thickness difference fed back by the post process is better, the 7um precision is 99.47 percent, the 5um precision is 91.15 percent, the wedge-shaped mean value of the hot rolling process is 0mm, the full-length hit rate is 99.31 percent, and the condition is better.
Example 4
The wedge mean value of this example is-4 mm, the full length hit rate is 97.68%, the statistical range is + -22um, and the thickness is 2.55mm.
A method for improving a strip steel with the thickness of 2.55mm by using a CSP process comprises the following steps:
1) the reduction rate load distribution scheme is as follows;
2) a guide plate short stroke control parameter;
TABLE 2 short run setting requirements for guide plates
3) Convexity target 30um, actual 31 um;
the transverse thickness difference fed back by the post process is better, the 7um precision is 98.47 percent, the 5um precision is 89.20 percent, the wedge-shaped average value of the hot rolling process is-4 mm, the full-length hit rate is 97.68 percent, and the situation is better.
Example 5
The wedge mean value of this example is-2 mm, the full length hit rate is 97.81%, the statistical range is + -22um, and the thickness is 2.55mm.
A method for improving a strip steel with the thickness of 2.55mm by using a CSP process comprises the following steps:
1) the reduction rate load distribution protocol was as follows:
1) a guide plate short stroke control parameter;
TABLE 2 short run setting requirements for guide plates
2) Convexity target 29um, actual 29 um;
the transverse thickness difference fed back by the post process is better, the 7um precision is 98.21 percent, the 5um precision is 89.33 percent, the wedge-shaped average value of the hot rolling process is-2 mm, the full-length hit rate is 97.81 percent, and the situation is better.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (1)
1. A control method for improving the wedge shape of a strip steel rolled in a two-phase region is characterized by comprising the following steps:
(1) load distribution
By adopting a load distribution mode of reduction rate distribution, under the condition of meeting good plate crown, increasing the rolling force of F1-F4 stands, reducing the rolling force of F5-F7 stands, and gradually reducing the rolling force of the stands from F1 to F7;
when the load is distributed, the reduction rate range of the control frame is as follows: the device comprises a rack F1, a pressing rate range of 48-52%, a rack F2, a pressing rate range of 51-55%, a rack F3, a pressing rate range of 44-47%, a rack F4, a pressing rate range of 34-37%, a rack F5, a pressing rate range of 24-26%, a rack F6, a pressing rate range of 17-21%, a rack F7, a pressing rate range of 10-14%, and a pressing rate of the rack F2 is more than or equal to that of the rack F1;
(2) short stroke control of guide plate and vertical roller
2.1 short stroke control of guide plate
The guide plate short stroke control is that a rack F2 controls the guide plate short stroke to be 10-15 mm, a rack F3 controls the guide plate short stroke to be 15-20 mm, a rack F4 controls the guide plate short stroke to be 30-40 mm, a rack F5 controls the guide plate short stroke to be 30-40 mm, a rack F6 controls the guide plate short stroke to be 35-45 mm, a rack F7 controls the guide plate short stroke to be 40-50 mm;
2.2 changing vertical roll control from position control to pressure control
Controlling the pressure of a vertical roll to be 50-100 KN at 1-3 m of the head of the slab, controlling the pressure of the vertical roll to be 200-300 KN at 27-39 m of the middle of the slab, controlling the pressure of the vertical roll to be 1-3 m of the tail of the slab, and controlling the pressure of the vertical roll to be 200-300 KN;
(3) range of selected convexity values
The strip steel convexity value is the difference value between the central thickness of the strip steel and the average thickness value of the edge part at 40mm, and the convexity range is selected to be 27-32 mu m.
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| CN103551398B (en) * | 2013-11-06 | 2015-09-30 | 北京首钢股份有限公司 | A kind of non-orientation silicon steel hot rolled coil Wedge Control |
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