CN109772894B - Strip steel width control method for hot rolling wedge-shaped blank - Google Patents
Strip steel width control method for hot rolling wedge-shaped blank Download PDFInfo
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Abstract
The invention relates to a strip steel width control method of a hot rolling wedge-shaped blank, which comprises the following steps of firstly, finishing rough rolling target and load distribution according to the width of a large-head supplied material; determining the width reduction of each pass of the small head according to the width target of each pass of the large head; and the large and small ends of the plate blank are controlled to be pressed down by adopting a long-stroke control field connection control curve, and finally the final rectangular control of the plate blank is realized. The control method of the invention greatly improves the control precision and solves the problem that the overall control precision of the slab width of the existing control method is not high enough.
Description
Technical Field
The invention relates to the technical field of steel rolling control, in particular to hot rolling steel, and specifically relates to a method for controlling the width of a hot-rolled wedge-shaped blank strip.
Background
In order to improve the production efficiency of the Bao steel continuous casting, an online width adjusting technology is adopted, and a wedge-shaped plate blank is generated in the continuous casting width adjusting process.
Application number 201210211053.9 discloses a hot rolling width control method of wedge-shaped slabs, which mainly aims at classification control of slabs with different wedge degrees, and the claimed method is mainly embodied in different control strategies, such as dividing the wedge degree into 3 grades (less than 20mm, 20mm to 40mm, and more than 40 mm), and selecting different short stroke control strategies and long stroke control strategies according to different wedge degrees.
Application number 201210211043.5 discloses a method for controlling the width of a ferrite hot-rolled stainless steel wedge-shaped slab, which mainly describes a method for measuring the width of the wedge-shaped slab, the installation position of a width gauge, the definition and the number of measuring points of the head, middle and tail widths of the slab, and the actual control is carried out according to the relatively narrow ends of the head and the tail.
The publication No. CN100488651C (Method of setting/controlling wedge in sheet rolling) is a control Method in which a measuring device is installed on a rolling mill, a wedge shape of a slab in the width direction is detected, calculation is performed by using the measured value, and roll gaps on both sides of a horizontal roll are adjusted, thereby eliminating the wedge shape in the width direction of the slab.
The publication No. CN101934292B (Automatic control method for wedge and wedge of rolled strip wedge), is also a control method for wedge of slab width direction, and is different from the method that a soft measurement mode is adopted, that is, by calculating the deviation between the rolling force at two sides of the rolling mill and the rolling force at two sides of the rolling mill, different rolling forces and different bounces are reversely deduced, so that the roll gaps at two sides of the rolling mill are inconsistent, thereby causing the wedge of slab width direction.
Publication No. CN106140825A (A method for controlling a wedge of side guiding strip steel generator) is a control method for preventing the wedge in the length direction of the strip steel by controlling the opening of the side guide.
The overall control accuracy of the above control method is not high enough.
Disclosure of Invention
The invention aims to provide a strip steel width control method of a hot-rolled wedge-shaped blank, which is used for solving the problem that the overall control precision of the width of the blank is not high enough in the existing control method.
In order to achieve the purpose, the scheme of the invention is as follows: a method for controlling the width of hot-rolled wedge-shaped blank strip steel comprises the following steps:
(1) according to the width of the big end of the wedge-shaped blank, setting of rough rolling target width and horizontal roller load distribution is completed;
(2) determining SP (service provider) large-side pressure reduction, vertical roll reduction of each pass and outlet target width of each forward pass of a horizontal roll of the large head of the incoming material of the wedge-shaped blank during rough rolling by taking the large head of the incoming material of the wedge-shaped blank as a reference;
(3) calculating the SP large side pressure reduction of the small end of the wedge-shaped blank during rough rolling according to the width of the small end inlet of the wedge-shaped blank;
(4) establishing a nonlinear equation according to the step (2) and the step (3) to obtain the first pass pressing amount of the small-end vertical roll;
(5) calculating the vertical roll rolling reduction of the wedge-shaped blank small head of each subsequent pass by taking the target width of the outlet of each forward pass of the large-head horizontal roll of the wedge-shaped blank as the target width value of the small head of the wedge-shaped blank;
(6) converting the small end rolling reduction of the wedge-shaped blank into a set rolling reduction gap by taking the set rolling gap of the large end of the wedge-shaped blank as a reference;
(7) judging the order of feeding the large and small ends of the wedge-shaped blank, and converting the roll gap setting of the large and small ends of the wedge-shaped blank into roll gap setting of the head and tail vertical rolls of the strip to be rolled;
(8) performing interpolation processing on the intermediate transition section of the strip steel to be rolled by adopting a long-stroke method according to the roll gap setting of the vertical rolls at the head and tail parts of the strip steel to be rolled to obtain a set width control curve of the strip steel to be rolled;
(9) controlling the roll gap opening of the vertical roll according to the set width control curve, and performing rough rolling and preset rolling;
(10) and measuring and feeding back the actual value of the strip steel width at the rough rolling outlet until the deviation of the actual value of the strip steel width and the set value meets the requirement, and finishing rough rolling.
Further, according to the method for controlling the strip width of the hot-rolled wedge-shaped blank of the present invention, in the step (2), the method for calculating the rolling reduction of the vertical roll of each pass of the wedge-shaped blank big head comprises: the rolling reduction of the vertical roller of the big head is taken as a variable x, and a nonlinear equation is constructed as follows:
f(x)＝-x+W0-Big(i)+dWSpread-Big(i)+dWDog-Big(i)-WT arg et(i)
iteratively solving the vertical roll reduction through a Newton chord section method;
in the formula, WT arg et(i) The target width of an outlet of the ith horizontal roller (forward pass) in the rough rolling process is set; dWSpread-Big(i) Horizontal broadening of the large head of each pass; dWDog-Big(i) Spreading the vertical roll dog bones with big heads everywhere; w0_Big(i) The width of the vertical roller inlet is large at all positions.
Further, according to the method for controlling the strip width of the hot-rolled wedge-shaped blank of the present invention, in the step (2), the method for calculating the large side pressure reduction of the large head SP of the wedge-shaped blank comprises: setting the SP large side pressure reduction of the big head as the required variable x, and establishing a nonlinear equation as follows:
f(x)＝-x+W0-Big-dWEdger-Big+dWSpread-Big+dWDog-Big+dWSPDog-Big-WT arg et
iteratively solving the SP large side pressure reduction of the big head by a Newton chord section method;
in the formula, dWEdger-BigSide pressure of vertical roll, dW, being large headSPDog-BigSP large side pressure dog bone broadening for big head
Further, according to the method for controlling the strip width of the hot-rolled wedge-shaped blank of the present invention, in the step (3), the SP large side pressure reduction of the small end of the wedge-shaped blank is:
dWSP-Small＝W0_Small-(W0_Big-dWSP-Big)，if dWSP-Small≤0,dWSP-Small＝0
in the formula, dWSP-SmallThe pressure reduction of the small-end SP at the large side is obtained; w0_SmallIs the small-end inlet width; dWSP-BigThe large side pressure reduction of the large head SP.
Further, according to the method for controlling the strip width of the hot-rolled wedge-shaped blank, in the step (4), the method for calculating the rolling reduction of the first pass vertical roll of the small end of the wedge-shaped blank comprises the following steps: the rolling reduction of the first pass vertical roll of the small head is taken as a variable x, and a nonlinear equation is constructed as follows:
f(x)＝-x+W0-Small-dWSP-Small+dWSpread-Small+dWDog-Small+dWSPDog-Small-WT arg et(1)
iteratively solving the first pass of vertical roll reduction of the small head by a Newton chord section method;
in the formula, dWSpread-SmallHorizontal spread of the small head; dWDog-SmallWidening a small-head vertical roll dog bone; dWSPDog-SmallPressing the dog bone to widen for the SP big side of the small head; wT arg et(1) R1 horizontal roller first pass exit target width, which is large head.
Further, according to the method for controlling the strip width of the hot-rolled wedge-shaped blank of the present invention, in the step (5), the method for calculating the vertical roll reduction of the small end of each subsequent wedge-shaped blank includes: and (3) taking the vertical roll reduction of the small end of the wedge-shaped blank in each subsequent pass as a variable x, and constructing a nonlinear equation as follows:
f(x)＝-x+W0-Small(i)+dWSpread-Small(i)+dWDog-Small(i)-WT arg et(i)
and (4) iteratively obtaining the vertical roll reduction of each pass of the small end by a Newton chord section method.
The invention achieves the following beneficial effects: the control method of the invention greatly improves the width control precision of the wedge-shaped slab, and the width control qualification rate of the wedge-shaped slab reaches more than 95%.
Drawings
FIG. 1 is a schematic diagram of a hot rolling width control system;
FIG. 2 is a flow chart of the roughing width control of the present invention;
FIG. 3 is a 1 st pass head control curve for the E1 vertical roll;
FIG. 4 is the tail control curve for pass 1 of the E1 vertical roll;
FIG. 5 is a 2 nd pass head control curve for the E1 vertical roll;
FIG. 6 is the end control curve for pass 2 of the E1 vertical roll;
FIG. 7 is a 1 st pass head control curve for the E2 vertical roll;
FIG. 8 is the tail control curve for pass 1 of the E2 vertical roll;
FIG. 9 is a 2 nd pass head control curve for the E2 vertical roll;
fig. 10 is the end control curve for pass 2 of the E2 vertical roll.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The invention has proposed a hot-rolled wedge-shaped blank (T parison) width control technology, for the wedge-shaped slab, there are major part and little head, the invention is according to the width of the major part supplies at first, finish rough rolling goal, load distribution; determining the width reduction of each pass of the small head according to the target width of each pass outlet determined by the large head; and the large and small ends of the plate blank are controlled to be pressed down by adopting a long-stroke control field connection control curve, and finally the final rectangular control of the plate blank is realized. The technology is already applied to a precious steel 1580 hot rolling production line, and a good application effect is achieved, as shown in fig. 2, the specific control process is as follows:
1, rough rolling target width and horizontal roll load setting calculation
The width control target of hot rolling generally refers to the finish rolling width, but the main rolling process of the width is completed in rough rolling. In the process of finish rolling of the strip steel, the width of the strip steel can be widened and narrowed. Therefore, the rough rolling setting is to determine a rough rolling exit target width on the basis of the finish rolling target width first. The target width of the rough rolling outlet considers the width allowance of different steel types and specifications, the predicted value of the finish rolling natural width, the artificial target width correction amount and the width global heredity equivalent.
The rough rolling horizontal roll load setting calculation is a general calculation and is basically completed before the vertical roll setting.
2, determining SP high side pressure and vertical roll load distribution by taking the big head of the wedge-shaped blank as a reference, and determining SP high side pressure reduction dW of the big head of rough rollingSP-BigThe vertical roll reduction dW of each passEdger-Big(i) And the target width W of the outlet of each horizontal roller forward passT arg et(i)。
The calculation of the vertical roll load distribution of the rough rolling big end is the same as that of the vertical roll load distribution of the conventional plate blank, and the SP large side pressure reduction is calculated as follows:
SP large side pressure reduction dW with large headSP-BigFor the variable x sought, a non-linear equation is established as follows:
f(x)＝-x+W0-Big-dWEdger-Big+dWSpread-Big+dWDog-Big+dWSPDog-Big-WT arg et
iterative calculation of SP (phase pressure) large-side pressure reduction dW of large head by Newton chord section methodSP-Big。
In the formula, W0_BigWidth of vertical roll entrance, dW, being large headEdger-BigSide pressure of vertical roll, dW, being large headSpread-BigHorizontal expansion for large head; dWDog-BigWidening a big-end dog bone by using a vertical roller; dWSPDog-BigPressing the dog bone to widen for the SP big side of the big head; wT arg etFor rough rolling the 1 st secondary horizontal roll dWSP-Small＝W0_Small-(W0_Big-dWSP-Big) The target width of the outlet.
3, according to the width W of the small end inlet of the strip steel0_SmallCalculating the SP large side pressure reduction dW of the small headSP-Small；
if dWSP-Small≤0,dWSP-Small＝0
In the formula, dWSP-SmallThe pressure reduction of the small-end SP at the large side is obtained; w0_SmallIs the small-end inlet width; w0_BigIs the width of the big-end entrance; dWSP-BigThe large side pressure reduction of the large head SP.
4, establishing a nonlinear equation according to the small end inlet width, the SP rolling reduction and the R1 outlet target width determined by the large end load distribution, and iteratively solving the first pass rolling reduction dW of the vertical roll of the small end by a Newton chord intercept methodEdger-Small(1)
The rolling reduction of the first pass vertical roll of the small head is taken as a variable x, and a nonlinear equation is constructed as follows:
f(x)＝-x+W0-Small-dWSP-Small+dWSpread-Small+dWDog-Small+dWSPDog-Small-WT arg et(1)
and (4) iteratively obtaining the first vertical roll reduction x of the small head by a Newton chord section method.
In the formula, dWSpread-SmallHorizontal spread of the small head; dWDog-SmallWidening a small-head vertical roll dog bone; dWSPDog-SmallPressing the dog bone to widen for the SP big side of the small head; wT arg et(1) R1 horizontal roller first pass exit target width, which is large head.
And 5, calculating the reduction of each pass of the small end of the subsequent vertical roll pass by taking the target width of the outlet of each forward pass of each horizontal roll with the large end as the target width value of the small end.
The vertical roll reduction dW of each pass of the small endEdger-Small(i) Constructing a nonlinear equation:
f(x)＝-x+W0-Small(i)+dWSpread-Small(i)+dWDog-Small(i)-WT arg et(i)
and (4) iteratively obtaining the vertical roll reduction of the subsequent vertical roll pass of the small end through a Newton chord section method.
And 6, converting the small end rolling reduction of the wedge-shaped blank into the set rolling gap by taking the set rolling gap of the large end of the wedge-shaped blank as a reference.
7, judging the order of feeding the large and small ends of the wedge-shaped blank, and converting the roll gap setting of the large and small ends of the wedge-shaped blank into the roll gap setting of the head and tail vertical rolls of the strip to be rolled;
and 8, performing interpolation processing on the intermediate transition section of the strip steel to be rolled by adopting a long-stroke method according to the roll gap setting of the vertical rolls at the head and tail parts of the strip steel to be rolled to obtain a set width control curve of the strip steel to be rolled, as shown in figures 3 to 10.
9, controlling the roll gap opening of the vertical roll according to the set width control curve, and performing rough rolling and preset rolling;
and 10, measuring and feeding back the actual value of the width of the strip steel at the rough rolling outlet until the deviation of the actual value of the width of the strip steel and the set value meets the requirement, and finishing rough rolling.
Examples
Actually produced strip steel (all data units are "mm"):
inlet head width: 1171.072
Inlet tail width: 1242.9044
Wedge starting position: 1200.0
Wedge end position: 10630.0
Slab length: 10760.0
Thickness of incoming material: 222.0
(1) Setting and calculating the rough rolling target width and the horizontal roll load:
rough rolling target width: 1092.1355
R1 horizontal roll depression amount: 20.295826,36.111572,30.270874
R2 horizontal roll depression amount: 34.849052,33.158211,25.261719
(2) Determining SP large side pressure and vertical roll load distribution by taking the large head of the wedge-shaped blank as a reference, and determining each pass reduction of the large head of rough rolling
The large side pressure target: 1062.896
Pressing the dog bone at the large side: 23.430
Large side pressure reduction: 210.74303
R1 horizontal roll entrance thickness: 242.91177
R1 horizontal roll forward exit width target: 1087.1355,1088.5789
R2 horizontal roll forward exit width target: 1084.1759,1092.1356
E1 vertical roll reduction: 2.000000,26.67223
E2 vertical roll reduction: 30.095285,17.925224
(3) Calculating the SP large side pressure reduction according to the width of the small-end inlet of the strip steel: 38.91063
(4) Calculating the vertical roll reduction according to the width of the small-end inlet
E1 vertical roll reduction: 0.0
Small-end entrance thickness: 236.93884
(5) And calculating the load distribution of each pass of the small end of the subsequent vertical roll pass by taking the width of the large end and the small end of the strip steel rolled after the R1 outlet as a reference.
R1：1058.1255,1088.5787
R2：1084.5536,1092.1355
E1：0.0,0.0
E2：0.0,7.7826347
The method comprises the steps of setting and converting long stroke control of a head vertical roll and a tail vertical roll of strip steel, setting a long stroke setting curve after interpolation processing is carried out on a middle transition section of a plate blank as shown in figures 3-10, wherein a point of a horizontal coordinate '0' of a head curve is the end part of the head; the tail abscissa "0" point is the first point of the middle long stroke. The ordinate of each graph represents the relative roll gap variation amount of the relative large head pressing position. The control method of the invention greatly improves the width control precision of the wedge-shaped slab, and the width control qualification rate of the wedge-shaped slab reaches more than 95%.
Claims (6)
1. A method for controlling the width of hot-rolled wedge-shaped blank strip steel is characterized by comprising the following steps: the width control method comprises the following specific steps:
(1) according to the width of the big end of the wedge-shaped blank, setting of rough rolling target width and horizontal roller load distribution is completed;
(2) determining SP (service provider) large-side pressure reduction, vertical roll reduction of each pass and outlet target width of each forward pass of a horizontal roll of the large head of the incoming material of the wedge-shaped blank during rough rolling by taking the large head of the incoming material of the wedge-shaped blank as a reference;
(3) calculating the SP large side pressure reduction of the small end of the wedge-shaped blank during rough rolling according to the width of the small end inlet of the wedge-shaped blank;
(4) establishing a nonlinear equation according to the step (2) and the step (3) to obtain the first pass pressing amount of the small-end vertical roll;
(5) calculating the vertical roll rolling reduction of the wedge-shaped blank small head of each subsequent pass by taking the target width of the outlet of each forward pass of the large-head horizontal roll of the wedge-shaped blank as the target width value of the small head of the wedge-shaped blank;
(6) converting the small end rolling reduction of the wedge-shaped blank into a set rolling reduction gap by taking the set rolling gap of the large end of the wedge-shaped blank as a reference;
(7) judging the order of feeding the large and small ends of the wedge-shaped blank, and converting the roll gap setting of the large and small ends of the wedge-shaped blank into roll gap setting of the head and tail vertical rolls of the strip to be rolled;
(8) performing interpolation processing on the intermediate transition section of the strip steel to be rolled by adopting a long-stroke method according to the roll gap setting of the vertical rolls at the head and tail parts of the strip steel to be rolled to obtain a set width control curve of the strip steel to be rolled;
(9) controlling the roll gap opening of the vertical roll according to the set width control curve, and performing rough rolling and preset rolling;
(10) and measuring and feeding back the actual value of the strip steel width at the rough rolling outlet until the deviation of the actual value of the strip steel width and the set value meets the requirement, and finishing rough rolling.
2. The method for controlling the strip width of a hot-rolled wedge-shaped billet according to claim 1, wherein the method for calculating the vertical roll reduction of each pass of the wedge-shaped billet big end in the step (2) comprises the following steps: the rolling reduction of the vertical roller of the big head is taken as a variable x, and a nonlinear equation is constructed as follows:
f(x)＝-x+W0-Big(i)+dWSpread-Big(i)+dWDog-Big(i)-WTarget(i)
iteratively solving the vertical roll reduction through a Newton chord section method;
in the formula, WTarget(i) The target width of an outlet of the horizontal roller of the ith pass of the previous pass in the rough rolling process; dWSpread-Big(i) Horizontal broadening of the large head of each pass; dWDog-Big(i) Widening a vertical roll dog bone with a large head in each pass; w0_Big(i) The width of the vertical roller inlet is the big end of each pass.
3. The method for controlling the strip width of a hot-rolled wedge-shaped billet according to claim 2, wherein in the step (2), the calculation method of the side pressure reduction of the large head SP of the wedge-shaped billet comprises the following steps: setting the SP large side pressure reduction of the big head as the required variable x, and establishing a nonlinear equation as follows:
f(x)＝-x+W0-Big-dWEdger-Big+dWSpread-Big+dWDog-Big+dWSPDog-Big-WTarget
iteratively solving the SP large side pressure reduction of the big head by a Newton chord section method;
in the formula, dWEdger-BigSide pressure of vertical roll, dW, being large headSPDog-BigSP big side pressure dog bone for big head, W0_BigWidth of vertical roll entrance, dW, being large headSpread-BigHorizontal spread of the big head, dWDog-BigWidening a big-end dog bone by using a vertical roller; wTargetThe target width of the outlet of the 1 st rough rolling secondary horizontal roller is shown.
4. The strip width control method of hot-rolled wedge-shaped billets as claimed in claim 3, wherein in the step (3), the SP large side reduction of the small end of the wedge-shaped billet is:
dWSP-Small＝W0_Small-(W0_Big-dWSP-Big)，if dWSP-Small≤0,dWSP-Small＝0
in the formula, dWSP-SmallThe pressure reduction of the small-end SP at the large side is obtained; w0_SmallIs the small-end inlet width; dWSP-BigThe large side pressure reduction of the large head SP.
5. The method for controlling the strip width of a hot-rolled wedge-shaped billet according to claim 4, wherein in the step (4), the method for calculating the reduction amount of the first pass vertical roll of the small end of the wedge-shaped billet comprises the following steps: the rolling reduction of the first pass vertical roll of the small head is taken as a variable x, and a nonlinear equation is constructed as follows:
f(x)＝-x+W0-Small-dWSP-Small+dWSpread-Small+dWDog-Small+dWSPDog-Small-WTarget(1)
iteratively solving the first pass of vertical roll reduction of the small head by a Newton chord section method;
in the formula, dWSpread-SmallHorizontal spread of the small head; dWDog-SmallWidening a small-head vertical roll dog bone; dWSPDog-SmallPressing the dog bone to widen for the SP big side of the small head; wTarget(1) R1 horizontal roller first pass exit target width, which is large head.
6. The method for controlling the strip width of a hot-rolled wedge-shaped blank according to claim 5, wherein in the step (5), the calculation method of the vertical roll reduction of the small end of each subsequent wedge-shaped blank comprises the following steps: and (3) taking the vertical roll reduction of the small end of the wedge-shaped blank in each subsequent pass as a variable x, and constructing a nonlinear equation as follows:
f(x)＝-x+W0-Small(i)+dWSpread-Small(i)+dWDog-Small(i)-WTarget(i)
iteratively obtaining the vertical roll reduction of each small end pass by a Newton chord section method, wherein dWSpread-Small(i) Horizontal broadening of each pass of the small end; w0-Small(i) The width of the entrance of each pass of the small end is the width of the entrance of each pass of the small end; dWDog-Small(i) The dog bone is widened for each pass of small head.
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| JP4150276B2 (en) * | 2003-03-20 | 2008-09-17 | 新日本製鐵株式会社 | Rolling method and rolling apparatus for metal sheet |
| CN101376139B (en) * | 2007-08-31 | 2010-09-08 | 宝山钢铁股份有限公司 | Control method for producing conical plate blank using side compression machine of fixed width plate blank |
| CN103506403B (en) * | 2012-06-25 | 2015-04-01 | 宝山钢铁股份有限公司 | Control method of hot rolling width of wedge-shaped slab |
| CN102716913B (en) * | 2012-06-26 | 2014-08-27 | 山西太钢不锈钢股份有限公司 | Width control method for ferrite hot rolling stainless steel wedge-shaped plate blank |
| CN104415972B (en) * | 2013-08-30 | 2016-08-24 | 宝山钢铁股份有限公司 | A kind of comprehensive self-adaptation control method of rough rolling strip steel width |
| CN104785534B (en) * | 2014-01-21 | 2017-06-06 | 宝山钢铁股份有限公司 | A kind of hot rolling width rapid correction method based on finish rolling measured data |
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