CN113953476A - Method for inhibiting self-drifting of double-roller casting and rolling Kiss point - Google Patents
Method for inhibiting self-drifting of double-roller casting and rolling Kiss point Download PDFInfo
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- CN113953476A CN113953476A CN202111233409.4A CN202111233409A CN113953476A CN 113953476 A CN113953476 A CN 113953476A CN 202111233409 A CN202111233409 A CN 202111233409A CN 113953476 A CN113953476 A CN 113953476A
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- kiss point
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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Abstract
The invention belongs to the technical field of double-roller casting, and particularly relates to a method for inhibiting self-drifting of a double-roller casting Kiss point. The applicant discovers by a double-roller casting-rolling molten pool tracing technology: there is self-drifting behavior at the Kiss point. The self-drift behavior of the Kiss point has a detrimental effect on process stability and cast strip quality. The method provided by the invention can be used for regulating and controlling the compensation amount of the boundary layer in the reflux region, and the negative influence of the Kiss point drift on the process stability and the cast strip quality is inhibited by changing the compensation amount of the boundary layer in the reflux region. Compared with the prior art stability control scheme, the method has the advantages that the implementation process is more effective, simple and reliable.
Description
Technical Field
The invention belongs to the technical field of double-roller casting, and particularly relates to a method for inhibiting self-drifting of a double-roller casting Kiss point.
Background
During the twin roll casting process, the Kiss point is not fixed, and self-drifting behavior exists. The self-drifting behavior of the Kiss point is due to the continuous decrease in the Kiss point temperature during casting, which causes the Kiss point position to move in the opposite direction to the direction of movement of the cast strip out of the bath. The Kiss point self-drift is the fundamental reason why twin roll casting is so difficult to commercialize in the field of steel materials, and is an inherent drawback of twin roll casting. So-called "self-drift", in short, the tendency of the Kiss point to move by itself during the transport process within the bath is not eliminated. Without active intervention strategies, the Kiss point will be further and further away from the minimum roll gap opening until the process is unable to proceed, i.e. conventional twin roll casting processes will always become more and more difficult to continue from a more stable phase, and the sudden interruption of the process caused by this Kiss point drift is a quantitative to qualitative process.
At present, in order to stabilize the twin roll casting process, researchers propose to adopt a method of changing the roll speed and/or the roll gap opening in real time, namely a method of 'after-the-fact intervention', and more typically, the method is proposed by researchers such as Florian brown and the like of the university of Purdue, usa. The applicant proposed a periodic roll speed control scheme based on "pre-prevention" in the invention patent application No. 202111186501. X. All these solutions are optimized for the movement strategy of the crystallization rollers, and the implementation of the control solution is complex.
Current process stabilization strategies are very complex and costly to implement.
Compared with the prior art, the implementation process of the control scheme is more effective, simple, reliable and economical.
Disclosure of Invention
The applicant, et al, for the first time, in patent document No. 202110122637.8, discloses a tracer technique that directly studies the actual transport behaviour in the bath. According to the tracing result, the temperature field of the reflux zone lacks a passive balance mechanism, the temperature of the reflux zone is always in a descending state, and the Kiss point has a continuous trend to move towards the direction opposite to the direction of moving the cast strip out of the molten pool, namely the Kiss point position cannot be stabilized.
The invention is based on the following principle: the periodic overcompensation action of the boundary layer in the backflow zone is promoted by adjusting the depth of the molten pool, so that low-temperature melt in the backflow zone is consumed, and the Kiss point position is promoted to move in the same direction as the moving direction of the cast strip.
The invention provides a method for inhibiting self-drifting of a twin-roll casting Kiss point, which is characterized by comprising the following steps:
stabilizing the mass of molten metal entering the bath through the distribution system during part or all of the casting and rolling stages, in units of timemIs set to periodically changem=f(t) F, the above f: (t)= f(t+ T), where f represents the function correspondence law,trepresenting time and T representing the period of the function. F is (f)t) May be a piecewise function. F is (f)t) May be a segmented, discontinuous function. In summary, in this document, f: (t) Should be considered to be used to represent any periodAnd (4) regularity. The molten pool is a space enclosed by a crystallizing roller and a side sealing device, the depth of the molten pool is the distance from the minimum opening of a roller gap to the free liquid level of the cast metal in the molten pool, and the definition of the free liquid level of the cast metal belongs to the common knowledge in the field.
Further, a method of inhibiting self-drift of a twin roll casting Kiss point, wherein the mass of molten metal entering the molten bath through the distribution system per unit time ismIs a sinusoidal waveform, said mass of molten metal entering the bath through the distribution system per unit timemComprises the following steps:
m=m0+Asin(Bt+ C), wherein m0A, B, C both represent empirical parameters, m0Related to the opening of the roll gap, the casting and rolling speed, the length of the roll body and the like,trepresenting time, A should preferably not exceed 0.1m. The value of a is related to the width of the two-phase zone of the metal material being cast.
Furthermore, a method of suppressing self-drift of a twin roll casting Kiss point, characterized in that the variation of the immersion volume of an object immersed in the bath per unit time is considered to be the mass of molten metal entering the bath through the distribution system per unit timemA change in (c). In thatmThe depth of the molten pool is changed under the condition of constant, the immersion depth of the water gap is periodically adjusted, and the change of the material volume of the water gap immersed in the molten pool in unit time is regarded as the change of the immersion depth of the water gap in the molten poolmA change in (c). In particular, inmThe depth of the molten bath is changed by adding an object to the molten bath under a constant condition and periodically adjusting the immersion depth of the object in the molten bath, and the change of the volume of the part of the object immersed in the molten bath in unit time is regarded asmA change in (c).
Compared with the prior art, the invention has obvious beneficial effects. The invention can simplify the current casting and rolling control system, further greatly improve the process robustness and enhance the cast strip quality. The method provided by the invention can be used for regulating and controlling the compensation amount of the boundary layer in the reflux region, and the negative influence of the Kiss point drift on the process stability and the cast strip quality is inhibited by changing the compensation amount of the boundary layer in the reflux region. Compared with the prior art stability control scheme, the method has the advantages that the implementation process is more effective, simple and reliable.
Drawings
FIG. 1 shows example 1 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses a method for inhibiting self-drifting of a twin-roll casting Kiss point in example 1, which is shown in figure 1.
In the embodiment 1 of the invention, the quality of the molten metal entering the molten pool between two crystallizing rollers is controlled by regulating and controlling the flow distribution systemm。
In the embodiment 1 of the present invention, the resin,mmeans the mass of molten metal entering the bath through the distribution system per unit time.
In example 1 of the invention, in FIG. 1, the mass of molten metal entering the bath through the distribution system is indicated on the ordinatemThe casting time is represented by a horizontal axistThe period is T and consists of a horizontal segment and a part of sine wave.
In example 1 of the present invention, timet 0 The initial start-up phase, the setting of the mass of molten metal entering the bath through the distribution system of the start-up phase, is not discussed in the context of this application.
In embodiment 1 of the present invention, two roll bodies of the crystallization roll are referred to as a first roll body and a second roll body, and the rotation speeds of the first roll body and the second roll body may not be equal.
This embodiment can be used in a reducing twin roll casting system.
In embodiment 1 of the present invention, the distance between the first roller body and the second roller body may be fixed or may be variable.
In embodiment 1 of the present invention, the rotation speeds of the first roller body and the second roller body may be fixed or may be variable.
In example 1 of the present invention, fig. 1 shows the set mass of molten metal entering the molten bath, and there is a difference between the actual mass of molten metal entering the molten bath and the set value, which may be caused by many factors including, but not limited to, a change in the opening of the roll gap and a change in the rotation speed of the crystallizing roll.
In example 1 of the present invention, the description is givenmThe periodic functions of (2) may be any form of periodic function, and the periodic functions may be continuous functions or discontinuous functions.
In example 1 of the present invention, the depth of the molten poolhMay be followed bymMay also be a periodic variation of the law ofmRelated but irregular changes.
It is easily contemplated to vary the bath level by adjusting the nozzle immersion depth according to example 1 of the present invention without departing from the scope of the claims appended hereto. In thatmThe depth of the molten pool is changed by periodically adjusting the immersion depth of the water gap under the condition of constant, and the change of the volume of the part of the water gap immersed into the molten pool in unit time is regarded asmA change in (c).
According to example 1 of the present invention, it is easily contemplated to add an object to the bath and to change the bath level by adjusting the immersion state of the object, without departing from the scope of the invention as claimed in the appended claims. In thatmThe depth of the molten bath is changed by adding an object to the molten bath under a constant condition and periodically adjusting the immersion depth of the object in the molten bath, and the change of the volume of the part of the object immersed in the molten bath in unit time is regarded asmA change in (c).
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.
Claims (3)
1. A method of inhibiting twin roll casting Kiss point self-drift, the method comprising:
stabilizing the mass of molten metal entering the bath through the distribution system during part or all of the casting and rolling stages, in units of timemIs set to periodically changem=f(t) F, the above f: (t)= f(t+ T), where f represents the function correspondence law,trepresenting time and T representing the period of the function.
2. The method for suppressing self-drift of the Kiss point in twin roll casting as claimed in claim 1, wherein the mass of molten metal entering the molten bath through the distribution system per unit time is determined by the mass of molten metal flowing into the molten bath through the distribution systemmIs a sinusoidal wave-shaped variation, the mass of molten metal entering the bath through the distribution system per unit timemComprises the following steps:
m=m0+Asin(Bt+ C), wherein m0Both A, B, C represent empirical parameters that,trepresenting time.
3. The method for suppressing self-drift of the Kiss point in twin roll casting according to claim 1, wherein the change in immersion volume of the object into the molten bath per unit time is considered to be the mass of molten metal entering the molten bath through the distribution system per unit timemA change in (c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233409.4A CN113953476A (en) | 2021-10-22 | 2021-10-22 | Method for inhibiting self-drifting of double-roller casting and rolling Kiss point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233409.4A CN113953476A (en) | 2021-10-22 | 2021-10-22 | Method for inhibiting self-drifting of double-roller casting and rolling Kiss point |
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| CN113953476A true CN113953476A (en) | 2022-01-21 |
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| CN202111233409.4A Withdrawn CN113953476A (en) | 2021-10-22 | 2021-10-22 | Method for inhibiting self-drifting of double-roller casting and rolling Kiss point |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB737064A (en) * | 1952-10-23 | 1955-09-21 | Babcock & Wilcox Co | Continuous casting |
| SU631257A1 (en) * | 1977-05-16 | 1978-11-05 | Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Черной Металлургии Им.И.П.Бардина | Method of continuous casting of aluminium-killed steel |
| JPH11170021A (en) * | 1997-12-09 | 1999-06-29 | Sumitomo Metal Ind Ltd | Detection of unsteady bulging in continuous casting and method for controlling molten metal surface |
| US20010002619A1 (en) * | 1999-04-28 | 2001-06-07 | Kazuharu Hanazaki | Method of controlling the molten metal level in mold in continuous casting |
| CN101094738A (en) * | 2004-12-28 | 2007-12-26 | 株式会社Posco | Robust control method of melt level in the twin roll strip caster |
| CN101314179A (en) * | 2007-05-28 | 2008-12-03 | 宝山钢铁股份有限公司 | Setting of rolling force of double-roll thin-belt continuous casting and control method thereof |
| CN101349923A (en) * | 2007-07-18 | 2009-01-21 | 宝山钢铁股份有限公司 | Method for controlling thin belt continuous casting molten pool fluid level |
-
2021
- 2021-10-22 CN CN202111233409.4A patent/CN113953476A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB737064A (en) * | 1952-10-23 | 1955-09-21 | Babcock & Wilcox Co | Continuous casting |
| SU631257A1 (en) * | 1977-05-16 | 1978-11-05 | Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Черной Металлургии Им.И.П.Бардина | Method of continuous casting of aluminium-killed steel |
| JPH11170021A (en) * | 1997-12-09 | 1999-06-29 | Sumitomo Metal Ind Ltd | Detection of unsteady bulging in continuous casting and method for controlling molten metal surface |
| US20010002619A1 (en) * | 1999-04-28 | 2001-06-07 | Kazuharu Hanazaki | Method of controlling the molten metal level in mold in continuous casting |
| CN101094738A (en) * | 2004-12-28 | 2007-12-26 | 株式会社Posco | Robust control method of melt level in the twin roll strip caster |
| CN101314179A (en) * | 2007-05-28 | 2008-12-03 | 宝山钢铁股份有限公司 | Setting of rolling force of double-roll thin-belt continuous casting and control method thereof |
| CN101349923A (en) * | 2007-07-18 | 2009-01-21 | 宝山钢铁股份有限公司 | Method for controlling thin belt continuous casting molten pool fluid level |
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Application publication date: 20220121 |