CN112958634A - Pre-leveling method of finish rolling machine frame based on sickle elbow part - Google Patents

Pre-leveling method of finish rolling machine frame based on sickle elbow part Download PDF

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CN112958634A
CN112958634A CN202110121737.9A CN202110121737A CN112958634A CN 112958634 A CN112958634 A CN 112958634A CN 202110121737 A CN202110121737 A CN 202110121737A CN 112958634 A CN112958634 A CN 112958634A
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sickle
length
elbow
camber
unit
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CN112958634B (en
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刘洋
王晓晨
刘东冶
邵健
杨荃
徐冬
孙友昭
何海楠
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USTB Design and Research Institute Co Ltd
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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
    • B21B37/72—Rear end control; Front end control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention provides a pre-leveling method of a finish rolling rack based on a sickle elbow part, and belongs to the technical field of plate strip rolling. Firstly reading rough rolling R2 outlet width gauge data, then fitting a middle blank center line curve, and determining the length l of a transmission side and an operation side of a camber head of the middle blank to be controlledos、ldsAnd calculating the thickness difference delta h of the two sides of the sickle elbow part according to the lengths of the two sides of the sickle elbow part, and finally calculating the roll gap inclination adjustment value delta S according to the model. The method can eliminate the influence of the camber part of the sickle of the intermediate billet on the deviation of finish rolling.

Description

Pre-leveling method of finish rolling machine frame based on sickle elbow part
Technical Field
The invention relates to the technical field of plate strip rolling, in particular to a pre-leveling method of a finish rolling rack based on a sickle elbow.
Background
Hot rolled strip is an important steel product and hot continuous rolling is one of the main ways of producing hot rolled strip. FIG. 1 shows a hot continuous rolling line for hot rolled strip. As shown in fig. 1, the hot continuous rolling line mainly includes a heating furnace, a roughing mill including a plurality of finishing stands, a finishing mill including finishing stands F1 to F7, a laminar cooling device, and a coiler. The production process of the hot continuous rolling production line comprises the following steps: firstly, heating a blank by a heating furnace, then removing phosphorus by high-pressure water, then roughly rolling by a rough rolling mill, then cutting the head and the tail, finely rolling by a finish rolling mill, then carrying out laminar cooling by a laminar cooling device, and finally coiling by a coiling machine to obtain a finished product of the hot-rolled strip steel.
The hot continuous rolling production process of the strip steel is often accompanied with the occurrence of the strip steel deviation phenomenon. In the middle process of continuous rolling, the plate strip is limited in deviation and rarely deviates due to the constraint action of a tension adjusting system and a centering system on the plate strip, and in the rolling process of the head and the tail, before the plate strip does not completely enter and separate from a rack, the deviation trend becomes severe suddenly due to the lack of the constraint of partial tension, the deviation amount is increased sharply, and obvious lateral bending and snake bending are formed. Different from other parts, the strip steel can be fed back and adjusted by measuring equipment in the rolling process, the running speed of the strip steel is high, and therefore the deviation of the head of the strip steel can be controlled only by presetting the roll gap. The head deviation phenomenon not only has great harm to the control and stability of the precision of the subsequent finish rolling and the finish rolling, but also can cause steel piling accidents in serious cases, and also can cause equipment fault problems of damage of a rolling mill, uneven axial abrasion of a working roll and the like due to the fact that the equipment is impacted, the production efficiency is seriously influenced, and the economic loss of enterprises is caused. Therefore, the control on the deviation phenomenon of the head of the strip steel has important significance on improving the product quality and reducing the production cost.
The camber problem arises from asymmetric rolling, i.e. the proportional wedge shapes of the mill inlet and outlet slabs are not equal. The factors causing the asymmetric rolling are various and mainly comprise three aspects of rolled pieces, rolling mills and rolling centering. Factors in the rolled stock include camber, wedge shape, and temperature uniformity of incoming slab stock. For the asymmetric rolling problem caused by the temperature uniformity of the supplied material of the plate blank, patents JP62197209A and JP06007818A disclose a camber and deviation control method based on temperature detection, which is characterized in that a temperature detection device is arranged at the inlet of a rolling mill, the transverse temperature difference of the plate blank is measured, so that the rolling force deviation and the roll gap deviation at two sides of the rolling mill are obtained, and the roll gaps at two sides of the rolling mill are compensated, so that the camber and deviation control is realized. But the method can not control the deviation and camber caused by camber and wedge degree of the incoming material of the plate blank. Patent JP62054511A discloses a camber control method based on visual detection, namely, a high-speed camera is mounted at an outlet of a rolling mill, the position of strip steel is detected in real time, deviation information is transmitted to a rolling mill pressing system, and two sides of the rolling mill are dynamically adjusted to be pressed down, so that camber and deviation control is realized. The method can solve the problems of deviation and camber caused by various factors, but the implementation investment is large and the period is long because a slab position detection and automatic deviation control system needs to be installed.
Disclosure of Invention
The invention aims to provide a fine rolling machine frame pre-leveling method based on a sickle elbow.
Firstly reading rough rolling R2 outlet width gauge data, then fitting a middle billet central line curve by adopting a least square method, and determining the length l of a transmission side and an operation side of a camber head of a middle billet to be controlledos、ldsAnd calculating the thickness difference delta h of the two sides of the sickle elbow part according to the lengths of the two sides of the sickle elbow part, and finally calculating the roll gap inclination adjustment value delta S according to the model.
The method specifically comprises the following steps:
(1) reading data of a rough rolling R2 outlet width gauge;
(2) fitting a central line curve of the intermediate blank;
(3) determining the length l of the transmission side of the elbow part of the intermediate billet to be controlledosAnd length of the operating side lds；
(4) Calculating the thickness difference delta h of the two sides of the sickle elbow part according to the length of the two sides of the sickle elbow part;
(5) calculating a roll gap inclination adjustment value delta S according to the following model:
Figure BDA0002922281900000021
wherein: alpha is a model adjusting coefficient and is dimensionless; q is the plasticity coefficient of the rolled piece, and the unit is kN/mm; k is the rigidity of the rolling mill and has the unit of kN/mm; h is0The thickness of the intermediate blank is in mm; b is the width of the rolled piece, and the unit is mm; y is the maximum deviation of the intermediate blank, and the unit is mm; x is the length of the elbow part of the sickle of the intermediate billet and the unit is mm.
Wherein, the position with the length range of the intermediate billet as W in the step (2) is defined as the head part of the sickle elbow, and the first two most values C on the curve of the sickle elbow are read according to the curve of the center line of the rough rolled sickle elbow1And C2Length l corresponding to two points1And l2，|C1-C2L is the maximum deviation Y, l of the intermediate blank2-l1Is the length X of the elbow part of the sickle of the intermediate billet.
The step (3) is specifically as follows: first, the curvature direction of the camber is determined, if C1-C2>0 is the camber is biased to the operating side, if C1-C2<0, the camber deflects to the transmission side;
then, the length l of the transmission side and the operation side of the sickle elbow part is calculatedos、ldsThe radius R of the approximate circular arc can be determined to be
Figure BDA0002922281900000031
If the camber deviates to the operation side, the calculation formula of the lengths of the transmission side and the operation side of the elbow part of the intermediate blank sickle is as follows:
Figure BDA0002922281900000032
if the camber deviates to the transmission side, the length calculation formula of the transmission side and the operation side of the elbow part of the intermediate blank is as follows:
Figure BDA0002922281900000033
and (4) knowing the width B of the strip steel in the step (4), and calculating the thickness difference delta h of the edge part of the sickle elbow part according to the lengths of the two sides of the sickle elbow part according to the volume invariance principle as follows:
if the sickle is deviated to the operating side, then
Figure BDA0002922281900000034
If the sickle is deviated to the transmission side, then
Figure BDA0002922281900000035
B is the width of a rolled piece, and the unit is mm; h0 is the thickness of the intermediate billet, and the unit is mm, hosThe thickness of the transmission side of the elbow part of the sickle hdsThe thickness of the operation side of the elbow part of the sickle.
In the step (5), the roll gap adjustment quantity is calculated according to the relation between the roll gap and the thickness of the rolled piece, and the formula is as follows:
Figure BDA0002922281900000036
wherein: alpha is a model adjusting coefficient and is dimensionless; q is the plasticity coefficient of the rolled piece, and the unit is kN/mm; k is the rigidity of the rolling mill and has the unit of kN/mm; h is0The thickness of the intermediate blank is in mm; b is the width of the rolled piece, and the unit is mm; y is the maximum deviation of the intermediate blank, and the unit is mm; x is the length of the elbow part of the sickle of the intermediate billet, and the unit is mm;
alpha is corrected according to the excellent data of the field.
The value range of W is 0.5-12%.
The technical scheme of the invention has the following beneficial effects:
according to the scheme, the pre-swing roll gap control can be performed according to the camber condition of the head of the incoming material of the intermediate billet, so that the influence of the rough rolling camber head on the finish rolling deviation can be effectively reduced, and the rolling stability is improved; the method of the invention does not synchronously implement the detection of the intermediate blank and the control of the roll gap, so the requirements on the synchronism and the real-time performance of the detection and the control are not high, and the cost of the detection and the control is low.
Drawings
FIG. 1 is a schematic view showing a hot continuous rolling line for hot rolled steel strip;
FIG. 2 is a schematic control flow diagram of a method for pre-controlling the deviation of a finishing mill stand according to a camber head of an intermediate slab according to an embodiment of the present invention;
FIG. 3 is a typical rough rolling off tracking curve of the present invention;
FIG. 4 is a schematic view of the approximate arc of the camber of the present invention;
FIG. 5 is an intermediate slab centering data curve of the method for pre-controlling off-tracking of a finishing mill stand according to an intermediate slab sickle head according to an embodiment of the present invention;
FIG. 6 is a P-H diagram of the invention with thickness differences on both sides of the rolled piece.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a pre-leveling method of a finish rolling machine frame based on a sickle elbow.
The method comprises the steps of firstly reading rough rolling R2 outlet width gauge data, then fitting a middle blank center line curve, and determining the length l of a transmission side and an operation side of a camber head of a middle blank to be controlledos、ldsAnd calculating the thickness difference delta h of the two sides of the sickle elbow part according to the lengths of the two sides of the sickle elbow part, and finally calculating the roll gap inclination adjustment value delta S according to the model.
The following description is given with reference to specific examples.
Example 1
Fig. 2 shows a flow of a method for pre-controlling the deflection of a finishing mill stand as a function of the camber head of an intermediate slab.
As shown in fig. 2, the method for pre-controlling the deviation of the finish rolling stand according to the camber head of the intermediate slab comprises the following specific steps:
s1, reading data of a rough rolling R2 outlet width gauge;
s2, fitting a center line curve of the intermediate billet, taking an assumption that a typical rough rolling deviation curve is shown in a figure 3, regarding a sickle bend line as a circular arc with large curvature, taking a figure 4 as an approximate circular arc schematic diagram of the sickle bend, defining a position with the length range of the intermediate billet as W as a head part of the sickle bend, and reading the first two most significant values C on the curve of the sickle bend part according to the center line curve of the rough rolling camber1And C2Length l corresponding to two points1And l2，|C1-C2L is the maximum deviation Y, l of the intermediate blank2-l1The length of the elbow part of the sickle of the intermediate billet is X;
in an embodiment, the centering data centerline data detected by the width gauge is shown in FIG. 5, the first extreme C of the camber curve127.5, length l in this case11.5; second extreme C of camber curve2Length l in this case ═ 17.5mm2＝9.8；C1-C2＝45>0, the camber deflects to the operation side, the maximum deviation Y of the intermediate billet is 45, and the length X of the camber head of the intermediate billet is 8.3 mm;
s3, determining the length l of the transmission side and the operation side of the elbow part of the intermediate billet to be controlledos、lds；
In an embodiment, the radius R of the approximate circular arc is
Figure BDA0002922281900000051
Because of C1-C2>0, the camber is deviated to the operation side, and the length calculation formula of the transmission side and the operation side of the elbow part of the intermediate blank is as follows: b is the diameter of the steel wire rod of 1200mm,
Figure BDA0002922281900000052
Figure BDA0002922281900000053
s4, calculating the camber according to the lengths of the two sides of the elbow part of the sickleThe thickness difference delta h of the head part side part; according to the inverse relation of the length of the inner and outer rings with the sickle curve and the thickness of the two sides of the middle blank with the constant volume
Figure BDA0002922281900000054
The calculation formula of the thickness difference between the two sides is as follows: h is0＝38mm，
Figure BDA0002922281900000055
S5, calculating a roll gap inclination adjustment value delta S according to the following model:
(1) calculating the roll gap adjustment amount according to the relation between the roll gap and the thickness of the rolled piece, and FIG. 6 is a P-H diagram of the thickness difference of the two sides of the rolled piece: the right side of the figure is a characteristic curve of the intermediate blank material,
Figure BDA0002922281900000061
wherein Q is the plastic deformation coefficient of the plate blank; the left side is a rigidity characteristic curve of the rolling mill,
Figure BDA0002922281900000062
wherein K is the stiffness coefficient of the rolling mill. Thus, the theoretical calculation of the leveling process is completed.
The formula is as follows:
Figure BDA0002922281900000063
in the formula: α is a model adjustment coefficient, which is dimensionless; q is the plasticity coefficient of the rolled piece, and the unit of Q is kN/mm; k is the rigidity of the rolling mill, and the unit of K is kN/mm; h is0Is the thickness of the intermediate billet, and the unit is mm; b is the width of the rolled piece, and the unit is mm; y is the maximum deviation of the intermediate blank, and the unit of Y is mm; x is the length of the elbow part of the sickle of the intermediate billet, and the unit of X is mm;
(2) correcting alpha according to the excellent data of the field;
because the leveling related influence factors are complex, the fault-tolerant interval is large, and the deviation problem is difficult to be considered and perfected only through theoretical calculation, excellent leveling samples in daily production are sorted, the experience knowledge of operators is summarized, reliable samples are obtained, and the alpha value is corrected. The conditions for screening the samples are as follows, and besides the product quality, the error caused by the false points of the instrument and the excessively small leveling change quantity to the final result is also considered to be avoided.
Table 1 screening conditions for excellent leveling samples
Figure BDA0002922281900000064
TABLE 2 calculated alpha values
Figure BDA0002922281900000065
Figure BDA0002922281900000071
TABLE 3 specific Process parameters for the method of pre-controlling the finishing mill stand according to the camber of the intermediate blank sickle
Frame F1 Frame F2 Frame F3
Middle blank sickle elbow length X (mm) 8.3 8.3 8.3
Maximum deviation Y (mm) of intermediate blank) 45 45 45
Rolling mill rigidity K (kN/mm) 2573 3290 1957
Rolled piece plasticity coefficient Q (kN/mm) 1100 1100 1100
Thickness h of intermediate blank0(mm) 38 38 38
Width of intermediate blank B (mm) 1200 1200 1200
Thickness h of strip steel at outleti(mm) 20.5 10.22 6.12
Model adjustment coefficient alphai 2.3
Roll gap adjustment quantity Delta Si(mm) -1.60
Example 2
The basic process is the same as that of example 1, the first extreme C of the camber curve of the sickle110.8, length l in this case11.3; first extreme C of camber curve2L of length at-49.5 mm2＝9.1；C1-C2＝45<0, the camber deflects to the transmission side, the maximum deviation Y of the intermediate billet is 60.3, and the length X of the camber head of the intermediate billet is 7.8 mm.
TABLE 4 specific Process parameters for the method of pre-controlling the finishing mill stand according to the camber of the intermediate blank sickle
Figure BDA0002922281900000072
Figure BDA0002922281900000081
The above-mentioned embodiment 1 and embodiment 2 only give the calculation of one L value, and for the different side thickness difference values obtained according to the step S4, the pre-swing roll gap adjustment quantity DeltaS of the frames F1-F3 of the corresponding side thickness difference value can be calculated only by substituting the step S5i. The embodiment 1 and the embodiment 2 have good effects in practical application, can reduce the deviation of finish rolling, break drift and scrap steel by rolling, and improve the stability of hot rolling.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A pre-leveling method of a finish rolling machine frame based on a sickle elbow is characterized by comprising the following steps: the method comprises the following steps:
(1) reading data of a rough rolling R2 outlet width gauge;
(2) fitting a central line curve of the intermediate blank;
(3) determining the length l of the transmission side of the elbow part of the intermediate billet to be controlledosAnd length of the operating side lds；
(4) Calculating the thickness difference delta h of the two sides of the sickle elbow part according to the length of the two sides of the sickle elbow part;
(5) calculating a roll gap inclination adjustment value delta S according to the following model:
Figure FDA0002922281890000011
wherein: alpha is a model adjusting coefficient and is dimensionless; q is the plasticity coefficient of the rolled piece, and the unit is kN/mm; k is the rigidity of the rolling mill and has the unit of kN/mm; h is0The thickness of the intermediate blank is in mm; b is the width of the rolled piece, and the unit is mm; y is the maximum deviation of the intermediate blank, and the unit is mm; x is the length of the elbow part of the sickle of the intermediate billet and the unit is mm.
2. The sickle nose based finish rolling stand pre-leveling method of claim 1, comprising: in the step (2), the position with the length range of the intermediate billet as W is defined as the head part of the sickle elbow, the center line curve of the rough rolled sickle elbow is fitted by adopting a least square method, and the first two most values C on the curve of the head part of the sickle elbow are read1And C2Length l corresponding to two points1And l2，|C1-C2L is the maximum deviation Y, l of the intermediate blank2-l1Is the length X of the elbow part of the sickle of the intermediate billet.
3. The sickle nose based finish rolling stand pre-leveling method of claim 1, comprising: the step (3) is specifically as follows:
firstly, judging the bending direction of the camber, if the first two maximum values C on the camber curve1And C2Satisfies C1-C2>0 is the camber is biased to the operating side, if C1-C2<0, the camber deflects to the transmission side;
then, the length l of the transmission side of the sickle elbow part is calculatedosAnd length of the operating side ldsDetermining the radius R of an approximate circular arc to be as follows according to the length X of the camber part of the sickle of the central curve of the intermediate blank and the maximum deviation Y of the intermediate blank
Figure FDA0002922281890000012
If the camber deviates to the operation side, the calculation formula of the lengths of the transmission side and the operation side of the elbow part of the intermediate blank sickle is as follows:
Figure FDA0002922281890000013
if the camber deviates to the transmission side, the length calculation formula of the transmission side and the operation side of the elbow part of the intermediate blank is as follows:
Figure FDA0002922281890000021
4. the sickle nose based finish rolling stand pre-leveling method of claim 1, comprising: the calculation formula of the thickness difference delta h of the edge part of the sickle elbow in the step (4) is as follows:
if the sickle is deviated to the operating side, then
Figure FDA0002922281890000022
If the sickle is deviated to the transmission side, then
Figure FDA0002922281890000023
B is the width of a rolled piece, and the unit is mm; h is0The thickness of the intermediate billet is set and the unit is mm, hosIs a sickleThickness of the transmission side of the tool bend part hdsThe thickness of the operation side of the elbow part of the sickle.
5. The sickle nose based finish rolling stand pre-leveling method of claim 1, comprising: the model in the step (5) is simplified as follows:
Figure FDA0002922281890000024
wherein: alpha is a model adjusting coefficient and is dimensionless; q is the plasticity coefficient of the rolled piece, and the unit is kN/mm; k is the rigidity of the rolling mill and has the unit of kN/mm; h is0The thickness of the intermediate blank is in mm; b is the width of the rolled piece, and the unit is mm; y is the maximum deviation of the intermediate blank, and the unit is mm; x is the length of the elbow part of the sickle of the intermediate billet, and the unit is mm;
alpha is corrected according to the excellent data of the field.
6. The sickle nose based finish rolling stand pre-leveling method of claim 2, comprising: the value range of W is 0.5-12%.
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CN114029346A (en) * 2022-01-10 2022-02-11 北京科技大学 Roll gap leveling and correcting method of finishing mill group suitable for free schedule rolling

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