CN116890096A - Variable superheat degree casting method for double-roller thin strip casting - Google Patents
Variable superheat degree casting method for double-roller thin strip casting Download PDFInfo
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- CN116890096A CN116890096A CN202310214649.2A CN202310214649A CN116890096A CN 116890096 A CN116890096 A CN 116890096A CN 202310214649 A CN202310214649 A CN 202310214649A CN 116890096 A CN116890096 A CN 116890096A
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- 238000005266 casting Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000155 melt Substances 0.000 claims description 40
- 230000000737 periodic effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 19
- 238000005096 rolling process Methods 0.000 abstract description 14
- 230000007704 transition Effects 0.000 description 25
- 238000002425 crystallisation Methods 0.000 description 18
- 230000008025 crystallization Effects 0.000 description 18
- 238000000926 separation method Methods 0.000 description 16
- 230000004907 flux Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 230000006399 behavior Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005253 cladding Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 238000009792 diffusion process Methods 0.000 description 2
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- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910001296 Malleable iron Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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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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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The application belongs to the technical field of twin-roll thin strip casting and rolling, and particularly relates to a variable superheat degree casting method for twin-roll thin strip casting and rolling. An unstable process parameter is provided to counteract the instability of the twin roll casting process itself.
Description
Technical Field
The application belongs to the technical field of twin-roll thin strip continuous casting, and particularly relates to a variable superheat degree casting method for twin-roll thin strip casting and rolling.
Background
The twin roll belts were proposed by the uk metallurgist Bessemer around 1850 and may be referred to in On manufacture of continuous sheets of malleable iron and steel direct from fluid metal (Journal of Metals, 1965), the destabilization mechanism and stability control of the twin roll belt process being century problematic.
In the double-roller thin belt process, materials are required to be added into a molten pool; the molten pool mainly comprises two crystallization rollers which rotate oppositely, and when the depth of the molten pool is large, a side sealing device is needed to support the formation of the molten pool; the contact type side sealing device is generally made of refractory materials and needs to be in close contact with the end part of the crystallization roller; the material entering the molten pool comprises liquid metal, and the liquid metal can enter the molten pool through a flow distribution device; the crystallization roller is generally cooled by water; the rotation of the crystallization roller is powered by a driving system, and the driving system for the rotation of the crystallization roller comprises a motor, a speed reducer, a universal connecting shaft and a transmission shaft; the material is moved out of the molten pool from the roll gap under the action of the driving force of the crystallization roll, and becomes a blank body with certain specification.
Twin roll strip casters are also known as twin roll casters, twin roll caster. The blank produced by the twin roll strip caster is not necessarily a strip, but is a long term common term in the art and includes thin strips, tubes, bars, plates, continuous blanks having a particular cross-sectional shape.
The twin roll caster comprises: equal-diameter twin-roll casting machine, reducing twin-roll casting machine and reducing twin-roll casting machine. For a twin roll caster, the placement of the two crystallization rolls includes: horizontally, obliquely and vertically. For twin roll casting machines, the strip extraction method includes: the direction of gravity, the direction of gravity and the direction of the gravity are completely opposite. The variable diameter twin roll casting machine is characterized in that the diameter of at least one of two crystallization rolls is changed along the roll shaft direction, and the variable diameter twin roll thin strip process can be used for preparing cladding materials such as cladding pipes, cladding bars, cladding sheets and the like.
Compared with the conventional continuous casting-rolling process, the double-roller thin strip process can greatly reduce energy consumption and environmental pollution, has remarkable economic and social benefits, is a green metallurgical process, is considered to have potential for subversion of the steel field, and has development meeting the attractive prospect of gradually and harmoniously coexisting people and the environment. The bath geometry and the technical basis of the twin roll strip process are quite different from conventional continuous casting. In the twin roll ribbon process, the shape of the crystallising rolls causes the melt pool to taper gradually in the direction of rotation of the crystallising rolls, the free surface area of the melt pool being tens of times, even more than one hundred times, the exit area of the melt pool.
For a long time, for the twin roll ribbon process, the stabilization of process parameters has been pursued by those skilled in the art, who believe that the stabilized process parameters bring about process stabilization and improvement of the quality of the cast ribbon.
The inventor and the like in Chinese patent document with application number 2021101226378 disclose a method for representing the conveying behavior in a molten pool in the process of double-roller casting and rolling. The theoretical basis of the tracing method is the phenomenon of turbulence zoning in a molten pool, which is first discovered by the inventor of the present application, and can be referred to in the literature: physical and computational study of a novel submerged entry nozzle design for twin-roll casting process (Journal of Iron and Steel Research International,2021, P1390-1399). The inventors have combined the "turbulence diffusion theory" with the "solid-liquid diffusion theory" according to the found "molten pool turbulence partition phenomenon", and proposed a tracing method.
The Chinese patent document with application number 2021112909655 discloses a method for measuring Kiss angle in a double-roller casting and rolling pool. The inventor confirms the advantages and the disadvantages of the tracing method through experiments, and in order to make up for the disadvantages of the tracing method, the inventor proposes a Kiss angle measurement method according to the segregation theory and the macro segregation is difficult to eliminate through post-treatment.
The inventor discloses a transfer process in a molten pool in an actual casting and rolling process for the first time through a laboratory experiment according to a method for representing transfer behaviors in the molten pool in a double-roll casting and rolling process disclosed in Chinese patent literature with application number 2021101226378. According to laboratory tracing results, it is confirmed that the boundary layer on the surface of the crystallization roller has separation behavior, namely, separation of momentum and heat, and the separation of the heat enables the temperature at the Kiss point to be in a continuously descending state, so that the vibration of the casting machine and the instability of the process are brought.
According to experimental results obtained by using a tracing method and a Kiss angle measuring method, the defects of the prior art scheme are as follows:
because of the separation process of the boundary layer in the molten pool, the separation process of the boundary layer can bring instability of the process, and the melt constant temperature control scheme in the prior art scheme is not beneficial to the stability of the process; that is, the existing stable superheat casting solution is not conducive to stable and straightforward process operation.
Disclosure of Invention
The present inventors have studied to find that the conventional knowledge about the transfer behavior of the bath shown in fig. 1 is one-sided, since there is no experimental method in the world to directly study the transfer behavior in the bath before the inventors propose the tracer method and the Kiss angle measurement method; the actual transport in the bath is shown in fig. 2, and the detailed transport shown in fig. 2 is shown in fig. 3.
In fig. 3, the separation point is the boundary point between the flow distribution area and the transition area; the separation point is the starting point of the separation flow formed after the fast flowing substances (roller surface dragging flow) carried by the crystallization roller encounter the two-phase region of the molten pool, and the separation flow can disturb the flow distribution region; after passing the separation point, no pure liquid phase exists, and the viscosity of the substance is greatly increased. In fig. 3, the compensation point is the boundary point between the transition zone and the shearing/rolling zone; the tracing inner layer moves along with the crystallization roller through the separation point, the thickness of the tracing inner layer gradually decreases due to the resistance action, and when the thickness of the tracing inner layer decreases to the minimum value and begins to keep stable, the point with the minimum thickness of the tracing inner layer is defined as a compensation point; after passing the compensation point, the thickness of the tracer inner layer is not changed any more.
The present inventors have found that in conventional twin roll casting processes, those skilled in the art provide melt casting temperatures that are as uniform as possible, i.e., the degree of superheat is constant. However, for a twin roll casting process with the speed boundary layer separation, compensation behavior shown in fig. 3, stable casting process parameters mean that the Kiss angle enthalpy in the bath is continually getting low, and too low a Kiss angle enthalpy can cause process instability and/or cast strip quality problems.
In order to overcome the defects of the prior art, the application provides a variable superheat degree casting method for twin-roll thin strip casting and rolling, and aims to provide a controllable and variable technological parameter for the twin-roll casting and rolling process so as to offset instability of the twin-roll thin strip casting and rolling process caused by separation of a temperature boundary layer, thereby improving the process stability.
The application provides a variable superheat casting method for twin roll strip casting, wherein the superheat of the melt entering the bath is controlled to be fluctuated, and the fluctuated can be periodic or aperiodic. The melt can enter the molten pool through the immersion nozzle, and the melt can also enter the molten pool through the atmosphere; the molten pool consists of two crystallization rollers rotating oppositely and a side sealing device; the term "controlled heave" means: the change in the degree of superheat must be the target of temperature control. That is, the temperature control results in a change in the degree of superheat.
It should be noted that, in the conventional various tundish heating technologies, an external heat source is sought to compensate for the temperature drop of the melt in the tundish, and the temperature of the melt in the tundish is maintained constant, so that the temperature of the melt entering the molten pool is stable. Obviously, the purpose of conventional tundish heating techniques is not to cause the degree of superheat of the melt entering the bath to vary as described.
Further, a variable superheat degree casting method for twin-roll thin strip casting, has N superheating degree melts, wherein the flux Q of the melt entering the molten pool is the mixture of the N superheating degree melts, and the volume ratio of the flux Q of the ith melt entering the molten pool through a water gap is V i (i is a positive integer from 1 to N, ΣV i =1) by adjusting the ratio of the different superheat melts such that there is a controlled fluctuation of the superheat of the melt entering the bath, which may be periodic or aperiodic. The melt flux Q into the melt pool may be set to vary with time.
Further, a variable superheat casting method for twin roll strip casting uses a heating method to heat the melt injected into the bath, and the controlled fluctuation of the superheat is achieved by varying the heating power.
Further, a variable superheat degree casting method for twin roll strip casting is characterized in that the superheat degree caused by the controlled fluctuation changes in a sinusoidal manner.
The technical proposal provided by the patent application document has the beneficial effects that:
the process stability and/or the cast strip quality can be further enhanced by inhibiting the enthalpy value reduction at the Kiss point caused by boundary layer separation;
reducing chatter generated during the manufacturing process of the casting and rolling machine.
Drawings
FIG. 1 is a schematic diagram of a conventional understanding of the progress of a solidified shell in a molten bath.
FIG. 2 is a schematic diagram of experimental results obtained by carrying out Kiss angle measurement method by a laboratory twin roll caster.
FIG. 3 is a schematic representation of the transmission behavior characteristics in the presence of a long range shear-thinning interface and a Kiss point\angle in the melt pool.
Fig. 4 is a schematic diagram of embodiment 1 of the present application.
The correspondence of the reference numbers referred to in the following figures is as follows:
1. the device comprises a first transition bag, a second transition bag, a first stopper rod, a second stopper rod, a transition bag boundary, a water gap, a first crystallization roller and a second crystallization roller.
Description of the embodiments
In order that those skilled in the art will better understand the present application, a technical solution of the embodiments of the present application will be clearly and completely described below, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. Thus, the following detailed description of the embodiments of the application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
Example 1
The embodiment 1 of the application discloses a variable superheat casting method for twin-roll strip casting, as shown in fig. 4, wherein the cast metal is steel material.
In example 1 of the present application, shown in FIG. 4, the diameters of the first crystallization roll 7 and the second crystallization roll 8 are 500 mm, the first crystallization roll 7 and the second crystallization roll 8 are horizontally placed, the thickness of the cast strip is 2 mm, and the speed of the strip moving out of the molten pool through the roll gap is in the range of 20 to 60 m/min.
During the preparation process, the superheat of the melt entering the bath has controlled fluctuations, which are periodic.
Undulating means: a change; lifting.
In example 1 of the present application, melts having two different superheating degrees were supplied through the first transition pack 1 and the second transition pack 2. The volume flux Q of the melt entering the molten pool through the water gap 6 is the mixture of the two melts with different superheat degrees, and the control fluctuation of the superheat degree of the melt entering the molten pool exists by adjusting the volume fractions of the melts with different superheat degrees.
The degree of superheat refers to the temperature difference between the actual temperature and the melting point, for example, the melting point of an alloy is 1000 ℃, but in the actual casting process, the alloy needs to be heated to 1050 ℃, and then the degree of superheat of the alloy is 50 ℃.
In the embodiment 1 of the present application shown in fig. 4, the volume of the first transition pack 1 is larger than that of the second transition pack 2, and the melt temperature in the first transition pack 1 is T 1 The temperature of the melt in the second transition bag 2 is T 2 ，T 2 =T 1 +50℃。
In example 1 of the present application, the melt had a melting point T 0 ，T 0 =1490 ℃; the superheat degree of the melt in the first transition bag 1 is 20 ℃, and the superheat degree of the melt in the second transition bag 2 is 70 ℃.
In example 1 of the present application, shown in fig. 4, the volumetric flux of the melt entering the bath through the nozzle 6 is Q: the volume flux of the melt of the first transition ladle 1 entering the molten pool is Q 1 =qsin (at+b), the volume flux of the melt of the second transition pack 2 into the bath is Q 2 =Q[1-sin(at+b)]T represents time, and a and b are empirical parameters. Generally, the closer the separation point is to the Kiss point, the smaller the value of a; the farther the separation point is from the Kiss point, the greater the a value. For nonferrous metal thin strip casting rolling, the value a is larger; for steel materials, the a value is smaller.
In example 1 of the present application, the undulation is periodic, that is, the degree of superheat of the melt entering the bath varies periodically, in particular in a sinusoidal manner.
The volumetric flux of the melt outflow in the first transition pack 1 is controlled by the first stopper 3; the volumetric flux of the melt outflow in the second transition ladle 2 is controlled by the second stopper rod 4.
Alternatively, the degree of superheat of the melt entering the bath through the nozzle 6 is non-periodically variable.
Alternatively, embodiment 1 of the present application is shown in fig. 4, where the volume of the first transition pack 1 is equal to the volume of the second transition pack 2.
Optionally, in embodiment 1 of the present application shown in fig. 4, a third transition packet or more transition packets are provided.
In example 1 of the present application, in fig. 4, the metal components in the first transition pack 1 and the second transition pack 2 are the same.
Alternatively, embodiment 1 of the present application shows that in fig. 4, the composition of the metal in the first transition pack 1 and the second transition pack 2 is different.
Example 2
The embodiment 2 of the application discloses a variable superheat degree casting method for twin-roll thin strip casting.
Example 2 of the present application has no drawing.
In embodiment 2 of the application, a high-power heating device is arranged around the water gap 6, and the power of the heating device is regulated to realize the controllable fluctuation of the superheat degree of the melt entering the molten pool.
The high power heating apparatus described in embodiment 2 of the present application includes: an induction heating apparatus.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present application after reading the present specification, and these modifications and variations do not depart from the scope of the application as claimed in the pending claims.
Claims (1)
1. A variable superheat degree casting method for twin-roll thin strip casting is characterized in that:
there is a controlled fluctuation in the degree of superheat of the melt entering the bath, which may be periodic or aperiodic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210352609.XA CN114850430A (en) | 2022-04-06 | 2022-04-06 | Variable superheat casting method for twin-roll thin strip casting and rolling |
| CN202210352609X | 2022-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116890096A true CN116890096A (en) | 2023-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210352609.XA Pending CN114850430A (en) | 2022-04-06 | 2022-04-06 | Variable superheat casting method for twin-roll thin strip casting and rolling |
| CN202310214649.2A Pending CN116890096A (en) | 2022-04-06 | 2023-03-08 | Variable superheat degree casting method for double-roller thin strip casting |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210352609.XA Pending CN114850430A (en) | 2022-04-06 | 2022-04-06 | Variable superheat casting method for twin-roll thin strip casting and rolling |
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| CN (2) | CN114850430A (en) |
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2022
- 2022-04-06 CN CN202210352609.XA patent/CN114850430A/en active Pending
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- 2023-03-08 CN CN202310214649.2A patent/CN116890096A/en active Pending
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| CN114850430A (en) | 2022-08-05 |
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