CN112742874A - Method for using belt head flat head for controlling strip steel deviation of hot finishing mill group - Google Patents
Method for using belt head flat head for controlling strip steel deviation of hot finishing mill group Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 124
- 239000010959 steel Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 77
- 230000008859 change Effects 0.000 claims abstract description 9
- 241000755266 Kathetostoma giganteum Species 0.000 claims description 89
- 230000001133 acceleration Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 10
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- 241000277275 Oncorhynchus mykiss Species 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/12—Length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/20—End shape; fish tail; tongue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/06—Threading
- B21B2273/08—Threading-in or before threading-in
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
- B21B2273/14—Front end or leading end
Abstract
A method for using a flat head of a band head for controlling the band steel to move away in a hot finishing mill group belongs to the field of metal rolling. The head of the intermediate strip steel blank is pressed down at an angle by using a flying shear device in front of a finishing mill group, so that the head of the intermediate strip steel blank entering an inlet of a finishing mill F1 rack is provided with a flat head structure; the flat head structure is X in length and is provided with an upper inclined wedge surface and a lower inclined wedge surface with an included angle alpha; the flat head structure can change the 'biting' contact angle between the head of the strip steel intermediate billet and the inlet roller of the F1 rack when the strip steel intermediate billet is bitten into the finish rolling rack, realizes the 'biting' of the strip included angle between the flat head of the strip steel and the roller of the inlet rack of the finish rolling rack, can reduce the influence of asymmetric inertia force caused by impact vibration when the strip steel is bitten into the finish rolling rack, and further relieves and lightens the deflection phenomenon of the head of the strip steel. Can be widely applied to the field of optimization control of finish rolling process.
Description
Technical Field
The invention belongs to the field of metal rolling, and particularly relates to a method for controlling the deviation of strip steel of a hot finishing mill group.
Background
In the process of the hot rolling production of the strip steel, a rough rolling mill 1 rolls a plate blank into an intermediate blank 4 with the thickness required by the inlet of a finishing mill 3, and the hot rolling strip steel intermediate blank is sheared by a flying shear 2 and then sent into the finishing mill for continuous rolling (shown in figure 1).
Since the flying shears vertically shear the strip, the cross-section of the head of the strip 41 is rectangular after the shearing step (as shown in fig. 2).
For a hot continuous rolling mill, at an inlet of a first rack (commonly called F1 rack) of a finishing mill, the rolling reduction of strip steel is large, the rolling force rises to the maximum value instantly when a strip is just impacted and bites into a roller, the inertia acceleration of the rolling mill is the maximum, the inertia force generated by a transmission shaft at one side is also the maximum, and at the moment, the strip steel is easy to asymmetrically roll due to asymmetric forward slip distribution, so that the strip head of the rolled strip steel is easy to deviate.
Today, the automatic thickness control technology is widely adopted in strip mills, the control of the longitudinal thickness precision can basically meet the requirement, and in contrast, the problem of transverse thickness control is still outstanding.
Good strip shape is not only a permanent requirement for the user, but also a requirement for a stable and smooth running of the strip on each continuous production line.
In order to continuously improve the quality level of strip shape of strip steel, the strip shape technology becomes a core technology in the production of strip steel. In particular, for high-grade products represented by electrical steel plates, tin plate DI materials, automobile plates and the like, the quality requirements of downstream users are continuously improved, and further improvement of the plate shape control technology is urgently needed.
A1580 hot rolling production line in a certain factory is one of cold rolling feeding main units, and is used for feeding materials in a downstream silicon steel cold rolling process, and the varieties mainly comprise oriented silicon steel, non-oriented silicon steel, tin plates and the like.
The final product of the silicon steel product, whether oriented silicon steel or non-oriented silicon steel, is used in a manner of splitting, punching and then laminating at an end user, and the larger the lamination height is, the higher the requirements on the thickness difference and the plate shape of the material are. During lamination, the thickness difference of materials can be accumulated, and finally the heights of the two sides of the part are inconsistent and the part cannot pass through a flow line to be produced, so that the continuous production process is interrupted.
Therefore, silicon steel users put forward a strict demand on the same-plate difference of silicon steel products, wherein 'edge drop' is a main problem that the current restriction influences the quality of the same-plate difference of the products, the deviation in hot-rolled strip steel rolling is one of important factors influencing the quality of strip steel products, and especially the strip shape is more seriously damaged by the asymmetrical 'edge drop' on the two sides of the strip steel caused by the deviation of the strip steel and is more difficult to control. Therefore, in the actual production and process control process, the problem of silicon steel plate deviation caused by the deviation of the strip head needs to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for using a flat head of a band head for controlling the band steel to move away in a hot finishing mill group. The flying shear device in front of the finishing mill group is used for pressing down the strip steel head at an angle, so that the head (for short, a strip head) of the strip steel intermediate billet entering an inlet of a finishing mill F1 rack is provided with a flat head structure, and the arrangement and the use of the flat head structure can reduce the influence of asymmetric inertia force caused by impact vibration when the strip steel bites into the finishing mill rack, reduce impact, relieve the action of inertia force of a transmission shaft, further reduce the deflection phenomenon of the strip steel head and improve the plate shape quality of the strip head part of the intermediate billet.
The technical scheme of the invention is as follows: the use method of the flat head of the strip head for controlling the strip steel to move off the way of the hot finishing mill group is provided, and is characterized in that:
the head of the intermediate strip steel blank is pressed down at an angle by using a flying shear device in front of a finishing mill group, so that the head of the intermediate strip steel blank entering an inlet of a frame F1 of the finishing mill is provided with a flat head structure;
the flat head structure is X in length and is provided with an upper inclined wedge surface and a lower inclined wedge surface with an included angle alpha;
the flat head structure can change the 'biting' contact angle between the head of the strip steel intermediate billet and an inlet roller of an F1 stand when the strip steel intermediate billet is bitten into a finish rolling stand, reduce the influence of asymmetric inertia force caused by impact vibration, and further relieve and reduce the deviation phenomenon of the head of the strip steel so as to effectively control the deviation phenomenon of the head when the strip steel is bitten into a threading process in the strip steel rolling process.
Specifically, the upper and lower inclined wedge surfaces of the flat head structure change the 'biting' contact position between the head of the strip steel intermediate blank and the inlet roller of the F1 stand and the included angle between the roller contact point and the horizontal line during contact, so that the impact vibration energy is reduced during the 'biting' contact between the inlet roller of the F1 stand and the head of the strip steel intermediate blank.
The front end of the strip steel intermediate billet is provided with the flat head structure, so that the included angle between the front end of the strip steel intermediate billet and the roller contact part during biting contact is changed, the change rate of the rolling force on the single side of the rack at the inlet of the finishing mill or the fluctuation rate of the inertial acceleration of the finishing mill can be reduced, the asymmetric rolling generated by the asymmetric forward slip distribution of the strip steel is reduced, the strip head deviation of the rolled strip steel is further controlled, and the strip head deviation phenomenon of the rolled strip steel is reduced.
Specifically, the flat head structure is a horizontal belt head structure which is similar to an isosceles trapezoid and is gradually thickened or thickened, the bottom edge of the isosceles trapezoid is equal to the thickness of a middle blank of the strip steel, the height of the isosceles trapezoid is the length X of the flat head, and the waist lines on the two sides form an upper inclined wedge surface and a lower inclined wedge surface of the flat head.
Specifically, according to the technical scheme of the invention, the thickness of the foremost end of the strip steel intermediate billet with different thicknesses is less than or equal to the rolling set thickness of an inlet roller of an F1 rack or less than or equal to the roll gap interval between an upper roller and a lower roller of the inlet roller of the F1 rack by setting the length of the flat head structure of the strip steel intermediate billet and the included angles between the upper wedge face and the lower wedge face.
Furthermore, through the arrangement and the use of the flat head structure of the intermediate blank of the strip steel, when the front end of the intermediate blank is bitten, the rolling force of a rolling mill gradually rises in the flat head area of the strip head, the inertia acceleration gradually increases, and the inertia force generated by a transmission shaft at one side of a working roll gradually increases; based on the buffering effect of the flat head, the acceleration pole generated by the belt head impact is reduced, so that the instantaneous effect of the impact inertia force when the intermediate blank of the strip steel is bitten is relieved, and the belt head deviation phenomenon when the strip steel is penetrated and bitten in the rolling process is effectively controlled.
Specifically, the upper and lower inclined wedge surfaces of the flat head structure are arranged in mirror symmetry along the thickness direction of the strip steel intermediate blank.
Specifically, the length of the flat head structure in the longitudinal direction of the strip steel intermediate blank is positively correlated with the thickness of the strip steel intermediate blank.
Further, at the initial moment of the 'biting' contact of the head of the strip steel intermediate billet with the inlet roller of the F1 stand, the thickness of the strip steel at the forefront end of the flat head structure of the strip steel intermediate billet is less than or equal to the rolling set thickness of the inlet roller of the F1 stand or less than or equal to the gap interval between the upper roller and the lower roller of the inlet roller of the F1 stand.
Compared with the prior art, the invention has the advantages that:
1. in the technical scheme, through the arrangement and the use of a flat head structure of the intermediate strip steel blank, when the front end of the intermediate strip is bitten, the rolling force of a rolling mill is gradually increased and the inertial acceleration is gradually increased based on the buffering effect of the flat head in a flat head area of the strip head, the inertial force generated by a transmission shaft at one side of a working roll is gradually increased, and the acceleration generated by the impact of the strip head is extremely reduced;
2. the flying shear device in front of the finishing mill group is used for pressing down the head of the strip steel in a belt angle manner, so that the thickness of the head of the strip steel intermediate blank entering the inlet of the F1 stand of the finishing mill is smaller than or equal to the rolling set thickness of the roller at the inlet of the F1 stand, or smaller than or equal to the roller gap interval between the upper roller and the lower roller in the roller at the inlet of the F1 stand, and the instantaneous acting force of the impact inertia force when the strip steel intermediate blank is bitten is relieved;
3. the arrangement and the use of the flat head structure in the technical scheme can reduce the influence of asymmetric inertia force caused by impact vibration when the strip steel is bitten into the finish rolling rack, further relieve and reduce the deflection phenomenon of the head part of the strip steel, and improve the plate shape quality of the head part of the intermediate billet.
Drawings
FIG. 1 is a schematic view of a conventional hot rolled strip production process;
FIG. 2 is a schematic view of the bite-in rolling state of an intermediate slab without a flat head;
FIG. 3 is a schematic view showing a bite rolling state when the intermediate slab has a flat head;
FIG. 4 is a graph comparing the variation curves of the rolling force of the single side with or without the flat head biting of the intermediate slab;
FIG. 5 is a graph comparing the curves of the tendency of the intermediate slab to drift after the intermediate slab is bitten into and rolled;
FIG. 6 is a schematic view of the flat head shape of the intermediate billet according to the present invention;
FIG. 7 is a schematic view of a design of a flat head with an inlet thickness of 40mm or less;
FIG. 8 is a schematic view of a flat head design with an inlet thickness greater than 40 mm;
FIG. 9 is a graph comparing the change curves of rolling force at one side of the intermediate billet with or without the flat head biting below 40 mm;
FIG. 10 is a graph showing a comparison of the tendency of the intermediate slab to have a flat bite or not after rolling of 40mm or less;
FIG. 11 is a graph comparing the change curves of the rolling force of the intermediate billet with or without the flat head biting on one side over 40 mm;
FIG. 12 is a graph showing a comparison of the tendency of the intermediate slab to have a flat bite or not after rolling over 40 mm.
In the figure, 1 is a roughing mill, 2 is a flying shear, 3 is a finishing mill, 4 is an intermediate billet, 41 is an intermediate billet without a flat head, and 42 is an intermediate billet with a flat head.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Aiming at a hot continuous rolling mill, at the inlet of a finish rolling F1 rack, the rolling reduction of strip steel is large, the rolling force rises to the maximum value instantly when the strip is just impacted and bites into a roller, the inertia acceleration of the rolling mill is maximum, the inertia force generated by a transmission shaft at one side is also maximum, and at the moment, the strip steel is easy to cause asymmetric forward sliding distribution to generate asymmetric rolling, so that the strip head is easy to deviate.
In fig. 3, to solve the above problems, the technical solution of the present invention is: the head of the strip steel intermediate billet 42 entering the inlet of the finishing mill F1 rack is pressed down in advance through a flying shear device before the finish rolling inlet, so that the head (the head for short) of the strip steel intermediate billet has a flat head structure, and then the strip steel intermediate billet enters the finishing mill for rolling.
The strip head of the strip steel bites into the rolling mill to generate impact vibration and further generate impact acceleration, and the whole impact vibration process is an equal period attenuation process, so the moment when the inertia force of the transmission shaft is the moment when the strip steel bites into the rolling mill is the maximum.
By adopting the technical scheme, the head of the strip steel is subjected to flat head treatment before the strip steel is bitten; when a flat head bites, the rolling force gradually rises in the area of the flat head of the strip head, the inertia force generated by a transmission shaft at one side of the working roll is gradually increased, and the acceleration generated by the impact of the strip head is extremely reduced due to the buffer action of the flat head, so that the instantaneous action of the large inertia force generated when the strip steel is impacted and bitten is relieved. The design of the flat head of the strip steel is beneficial to relieving the action of inertia force of the transmission shaft, and further can relieve the deviation behavior of the head of the strip steel.
By using the technology of the flat head of the strip steel intermediate blank at the inlet of the finish rolling stand of the hot continuous rolling mill, the asymmetric rolling caused by the action of inertia force of a transmission shaft on one side due to impact vibration can be relieved to a certain extent, and further the deviation of the strip head can be restrained.
The strip shape quality of the strip head can influence the strip shape quality of the whole strip steel to a certain degree, so that the control of the strip head strip shape, particularly the control of the strip head asymmetric rolling, is particularly important for the final strip shape quality of the hot rolled strip steel.
From the perspective of production processes, the specific implementation steps of the technical scheme of the invention comprise:
1. the roughing mill rolls an intermediate blank with the thickness of 30-65mm, which meets the requirements of the finishing mill, according to the rolling requirements of the finishing mill;
2. before the intermediate billet enters a finishing mill for rolling, the head of the intermediate billet is firstly sheared with an angle by using a flying shear, the shape of the sheared head is designed to be trapezoidal, and the sizes of the sheared head are respectively as follows:
the thickness of the intermediate blank is Y mm, the thickness-variable angle is alpha degree, and the thickness-variable length is X mm;
3. and feeding the intermediate billet with the trapezoidal head into a finishing mill for rolling.
In fig. 4, a graph showing the rise of the rolling force after the intermediate slab is bitten by the finishing mill in two conditions of the slab biting (the instant when the intermediate slab of the strip steel enters the first group of rolls of the F1 stand, referred to as "biting") and the no-slab biting is shown.
By comparison, for the biting when the front end of the middle billet has no flat head structure, the rolling force on one side of the finishing mill is instantly increased to the maximum value, at the moment, the strip steel is impacted to bite, the inertia acceleration of the mill is maximum, and the inertia force generated by the transmission shaft on one side is also maximum. At the moment, the strip steel is easy to asymmetrically slide forward, and further the strip head is easy to deviate.
When the front end of the intermediate billet is bitten by a flat head structure, the rolling force gradually rises in a belt head flat head area, the inertia acceleration is gradually increased, the inertia force generated by a transmission shaft at one side of a working roller is gradually increased, and the acceleration generated by belt head impact is extremely reduced due to the buffering action of the flat head, so that the instantaneous action of the large inertia force during the belt steel impact biting is relieved.
Therefore, the design of the flat head of the strip steel is beneficial to relieving the action of inertia force of the transmission shaft, and the deviation behavior of the head of the strip steel can be further relieved.
As can be seen from the statistics and analysis of the deviation position of the strip steel after passing through the rolling mill in fig. 5, the deviation position (vertical axis index) under the working condition without biting of the flat head rapidly changes and rises from the beginning with the increase of the rolling distance (horizontal axis index), and is basically stable until 200 meters later.
And for the working condition that the flat head bites, the deviation position of the flat head is basically stable from beginning to end in the whole rolling process, so that great convenience is brought to subsequent process adjustment and treatment.
In fig. 6, the flat head according to the technical scheme is formed by pressing down the head of the strip steel through a flying shear device before a finish rolling inlet, so that the head of the strip steel intermediate billet generates a flat head structure, the included angle of the flat head structure is α, and the length of the flat head structure is X. Furthermore, the flat head structure is in mirror symmetry along the thickness center line in the length direction of the strip steel.
In other words, in the technical scheme, the flying shear equipment presses down the strip angle of the strip steel head, and a transverse thickened (or thickened) strip head similar to an isosceles trapezoid is formed at the strip head part of the strip steel intermediate blank. The bottom edge of the isosceles trapezoid is equal to the thickness of the middle blank of the strip steel, the height of the isosceles trapezoid is equal to the length X of the flat head, the waist lines on the two sides form the upper inclined surface and the lower inclined surface of the flat head, the upper inclined surface and the lower inclined surface of the flat head are symmetrical, and the included angle between the upper inclined surface and the lower inclined surface and the thickness center line in the length direction of the strip steel is alpha.
Furthermore, the thickness of the head end of the flat head (i.e. the length of the top edge of the isosceles trapezoid) is preferably smaller than the inlet thickness of the F1 rolling mill.
For the flat strip steel head with the inlet thickness (namely the thickness of the intermediate billet) less than or equal to 40mm, the alpha included angle of the upper inclined plane and the lower inclined plane is 15 degrees +/-5 degrees, and the length X of the flat strip steel head is 30mm +/-8 mm.
For the strip steel flat head with the inlet thickness of more than 40mm, the alpha included angle is 15 degrees +/-5 degrees, and the length X of the strip steel flat head is 50mm +/-10 mm.
According to the different thicknesses of the intermediate billets at the inlet of the finishing mill group, the technical scheme of the invention preferably designs two flat head schemes:
scheme 1: the angle of the flat head is 15 degrees, and the length of the flat head is 30 mm;
scheme 2: the angle of the flat head is 15 degrees, and the length of the flat head is 30 mm;
adopting scheme 1 for the plate blank with the inlet thickness of less than or equal to 40 mm;
for slabs with an inlet thickness greater than 40mm, 50mm is used for the flat head length.
The design of the flat head and the parameters when the inlet thickness is less than or equal to 40mm are shown in fig. 7.
The design of the flathead and the parameters for an inlet thickness greater than 40mm are given in fig. 8.
The purpose of doing so is to facilitate the realization of the strip steel head biting and the strip steel flat head processing.
The purpose of selecting the above structural parameters is to ensure that the contact between the upper and lower inclined surfaces of the flat head of the strip steel and the inlet roll of the F1 stand is a biting state with an included angle (or a central angle of a roll contact part) at the moment when the flat head of the strip steel starts to contact with the inlet roll of the F1 stand (i.e. at the biting moment), and the impact vibration quantity between the upper and lower inclined surfaces of the flat head of the strip steel and the inlet roll of the F1 stand is controlled within a preset range, so that the rolling force of the rolls is kept relatively stable, the influence of asymmetric inertia force caused by impact vibration is reduced, and the deviation phenomenon of the head of the strip steel is further relieved.
FIG. 9 is a graph showing a comparison of the change curves of the biting-in unilateral rolling force when the intermediate slab having an inlet thickness of 40mm or less has a flat head structure or not.
FIG. 10 is a graph showing a comparison of the tendency of the bite-in to run off when the intermediate slab having an inlet thickness of 40mm or less has a flat head structure and does not have a flat head structure.
FIG. 11 is a graph comparing the bite single side roll force profiles with and without a flat head configuration for intermediate billets having an entrance thickness above 40 mm;
FIG. 12 is a graph showing a comparison of the tendency of the bite-in to run off when the intermediate slab has a structure with or without a flat head at an inlet thickness of 40mm or more.
Obviously, when the strip steel is bitten into the finish rolling rack, the influence of asymmetric inertia force caused by impact vibration of the strip steel is obviously reduced by adopting the strip steel intermediate billet with the strip head structure, the inertia force action of a transmission shaft is favorably relieved, and then the deviation of the strip head can be inhibited, so that the method is an optimized control method for controlling the deviation of the strip head when the strip steel is bitten into the finish rolling rack of the hot rolling unit.
By adopting the technical scheme, the actual problem that the head of the strip steel of a 1580 hot continuous rolling unit in a certain factory is seriously deviated is solved, and the control qualification rate of the deviation of the central line +/-15 mm of the head of the strip steel is improved to more than 70 percent from the original 54.62 percent.
The invention utilizes the flying shear device to press down the head of the strip steel with an angle, so that the head of the strip steel intermediate blank before entering the inlet of the finish rolling stand is provided with the flat head structure, the arrangement and the use of the flat head structure realize the 'biting' of a strip included angle between the flat head of the strip steel and the roller of the inlet stand of the finish rolling stand, and the influence of asymmetric inertia force caused by impact vibration can be reduced when the strip steel bites into the finish rolling stand, thereby relieving and lightening the deflection phenomenon of the head of the strip steel.
The invention can be widely applied to the field of optimization control of finish rolling process.
Claims (9)
1. A method for using a flat head of a band head for controlling band steel to deviate by a hot finishing mill group is characterized by comprising the following steps:
the head of the intermediate strip steel blank is pressed down at an angle by using a flying shear device in front of a finishing mill group, so that the head of the intermediate strip steel blank entering an inlet of a frame F1 of the finishing mill is provided with a flat head structure;
the flat head structure is X in length and is provided with an upper inclined wedge surface and a lower inclined wedge surface with an included angle alpha;
the flat head structure can change the 'biting' contact angle between the head of the strip steel intermediate billet and an inlet roller of an F1 stand when the strip steel intermediate billet is bitten into a finish rolling stand, reduce the influence of asymmetric inertia force caused by impact vibration, and further relieve and reduce the deviation phenomenon of the head of the strip steel so as to effectively control the deviation phenomenon of the head when the strip steel is bitten into a threading process in the strip steel rolling process.
2. The method of claim 1, wherein the nose has upper and lower tapered surfaces, and the angle between the nip point of the head of the intermediate strip and the entrance roll of the F1 stand and the horizontal line is changed, so that the impact vibration energy is reduced when the entrance roll of the F1 stand and the head of the intermediate strip are in nip contact.
3. The method for using the bandhead flathead for controlling the band steel wandering of the hot rolling finishing mill group according to claim 1, characterized in that the bandhead structure is arranged at the front end of the band steel intermediate billet, so that the included angle between the front end of the band steel intermediate billet and the roller contact part during the 'biting' contact is changed, the change rate of the rolling force at the single side of the frame at the inlet of the finishing mill or the fluctuation rate of the inertia acceleration of the finishing mill can be reduced, the asymmetric rolling generated by the asymmetric forward slip distribution of the band steel is reduced, the bandhead wandering amount of the rolled band steel is further controlled, and the bandhead wandering phenomenon of the rolled band steel is reduced.
4. The method of using a headed strip for a finishing hot rolling mill train to control strip runout according to claim 1, wherein the headed strip is a horizontally disposed headed strip of a gradually increasing thickness similar to an isosceles trapezoid having a base equal to the thickness of the strip intermediate slab, a height of the isosceles trapezoid being the length X of the headed strip, and upper and lower tapered wedge surfaces formed by the waistlines of the two sides of the headed strip.
5. The method of using a headed strip for a finishing hot rolling mill train controlling strip runout according to claim 1, wherein the thickness of the foremost end of the strip intermediate slab of different thickness is less than or equal to the rolling set thickness of the inlet roll of the F1 stand or less than or equal to the roll gap interval between the upper and lower rolls of the inlet roll of the F1 stand by setting the length of the structure of the headed strip and the angles of the upper and lower tapered wedge surfaces.
6. The method for using the flat head of the strip for controlling the strip steel to move away in the hot finishing mill group as claimed in claim 1, wherein the arrangement and the use of the flat head structure of the strip steel intermediate billet lead the rolling force of the rolling mill gradually rises, the inertia acceleration gradually increases and the inertia force generated by the transmission shaft at one side of the working roll gradually increases in the area of the flat head of the strip steel intermediate billet when the front end of the intermediate billet is bitten; based on the buffering effect of the flat head, the acceleration pole generated by the belt head impact is reduced, so that the instantaneous effect of the impact inertia force when the intermediate blank of the strip steel is bitten is relieved, and the belt head deviation phenomenon when the strip steel is penetrated and bitten in the rolling process is effectively controlled.
7. The method of using a headed slab for a finishing hot rolling mill train controlling strip running deviation according to claim 1, wherein the upper and lower tapered wedge surfaces of the slab structure are arranged in mirror symmetry in the thickness direction of the strip intermediate slab.
8. The method of using a headed strip for a finishing hot rolling mill train to control strip runout according to claim 1, wherein the length of the structure of the headed strip in the longitudinal direction of the intermediate strip is positively correlated with the thickness of the intermediate strip.
9. The method of using a headed strip for a finishing mill train controlling the running deviation of strip steel according to claim 1, wherein the thickness of the strip at the foremost end of the structure of the headed strip of the intermediate strip is less than or equal to the rolling set thickness of the inlet roll of the F1 stand or less than or equal to the roll gap interval between the upper and lower rolls of the inlet roll of the F1 stand at the initial time of the "biting" contact of the head of the intermediate strip with the inlet roll of the F1 stand.
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| CN201911048145.8A CN112742874A (en) | 2019-10-30 | 2019-10-30 | Method for using belt head flat head for controlling strip steel deviation of hot finishing mill group |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10328710A (en) * | 1997-06-05 | 1998-12-15 | Ishikawajima Harima Heavy Ind Co Ltd | High-reduction rolling method and rolling equipment therefor |
| JP2000246302A (en) * | 1999-02-24 | 2000-09-12 | Sumitomo Metal Ind Ltd | Hot rolling method of steel plate and rotary cutting equipment |
| CN103203358A (en) * | 2012-01-13 | 2013-07-17 | 宝山钢铁股份有限公司 | Rolling method capable of improving biting condition in rolling process of reversible rolling mill |
| CN103203359A (en) * | 2012-01-13 | 2013-07-17 | 宝山钢铁股份有限公司 | Rolling method for improving bite conditions of reversible mill |
| CN106890852A (en) * | 2015-12-21 | 2017-06-27 | 宝山钢铁股份有限公司 | Reduce the method that finishing mill stings steel impact |
| CN108906893A (en) * | 2018-08-03 | 2018-11-30 | 中铝瑞闽股份有限公司 | A kind of milling method improving aluminothermy finish rolling threading success rate |
-
2019
- 2019-10-30 CN CN201911048145.8A patent/CN112742874A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10328710A (en) * | 1997-06-05 | 1998-12-15 | Ishikawajima Harima Heavy Ind Co Ltd | High-reduction rolling method and rolling equipment therefor |
| JP2000246302A (en) * | 1999-02-24 | 2000-09-12 | Sumitomo Metal Ind Ltd | Hot rolling method of steel plate and rotary cutting equipment |
| CN103203358A (en) * | 2012-01-13 | 2013-07-17 | 宝山钢铁股份有限公司 | Rolling method capable of improving biting condition in rolling process of reversible rolling mill |
| CN103203359A (en) * | 2012-01-13 | 2013-07-17 | 宝山钢铁股份有限公司 | Rolling method for improving bite conditions of reversible mill |
| CN106890852A (en) * | 2015-12-21 | 2017-06-27 | 宝山钢铁股份有限公司 | Reduce the method that finishing mill stings steel impact |
| CN108906893A (en) * | 2018-08-03 | 2018-11-30 | 中铝瑞闽股份有限公司 | A kind of milling method improving aluminothermy finish rolling threading success rate |
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