CN113426967A - Device and method for controlling solidification by adopting vibration - Google Patents
Device and method for controlling solidification by adopting vibration Download PDFInfo
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- CN113426967A CN113426967A CN202110653560.7A CN202110653560A CN113426967A CN 113426967 A CN113426967 A CN 113426967A CN 202110653560 A CN202110653560 A CN 202110653560A CN 113426967 A CN113426967 A CN 113426967A
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- crystallizer
- vibration
- generating device
- vibration generating
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007711 solidification Methods 0.000 title claims abstract description 30
- 230000008023 solidification Effects 0.000 title claims abstract description 30
- 238000002425 crystallisation Methods 0.000 claims abstract description 35
- 230000008025 crystallization Effects 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 22
- 238000005266 casting Methods 0.000 abstract description 18
- 239000007791 liquid phase Substances 0.000 abstract description 8
- 239000007790 solid phase Substances 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 4
- 238000009749 continuous casting Methods 0.000 description 5
- 230000006911 nucleation Effects 0.000 description 5
- 238000010899 nucleation Methods 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
Abstract
The invention relates to a device and a method for controlling solidification by vibration, wherein the device comprises a crystallizer, a molten pool, a crystallizer base, a cooling system and a vibration generating device; the crystallizer sets up the top at the crystallizer base, the crystallizer comprises two counter-rotating's crystallization roller and both ends baffle, and both sides crystallization roller along the axial line contact, the molten bath sets up between the upper portion region of both sides crystallization roller, vibration generating device symmetry respectively sets up both sides around both sides crystallization roller below, just vibration generating device all with the bottom fixed connection of crystallizer base, cooling system sets up tip around both sides crystallization roller respectively. The invention can realize the stable control of the solidification process, effectively reduce the free energy difference of liquid and solid phases, improve and accurately solidify the temperature, refine the strip billet crystal grains, has more stable process and higher quality of the formed strip billet, and can better overcome the problem caused by unstable solidification due to small double-roller thin strip casting and rolling molten pool.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a device and a method for controlling solidification by adopting vibration.
Background
On conventional continuous casting equipment, a crystallizer is adopted for vibration, the vibration mode is a sinusoidal vibration mode and a non-sinusoidal vibration mode, the relation between the speed of the sinusoidal vibration and the time is a sinusoidal curve, the up-and-down vibration time of the sinusoidal vibration mode is equal, and the maximum speed of the up-and-down vibration is equal. In the vibration period, relative motion exists between the casting blank and the crystallizer all the time, and in the falling process of the crystallizer, a small section of falling speed is greater than the blank drawing speed, so that the stripping between the crystallizer and a new blank shell can be well promoted, the adhesion between the blank shell and the inner wall of the crystallizer can be prevented and eliminated, and the pulled blank shell can be healed, so that a good casting blank surface is obtained. The difference between the vibration speed of the crystallizer and the pulling speed is reduced in the positive sliding time in the non-sinusoidal vibration mode. Thus, the billet shell tensile stress acting below the meniscus is reduced. In the negative slip time, the difference between the crystallizer vibration speed and the pulling speed is increased. Therefore, the pressure applied to the blank shell is increased, the demoulding of the casting blank is facilitated, the negative sliding time is short, and the vibration marks on the surface of the casting blank are shallow. But the vibration technology adopted by the continuous casting crystallizer mainly solves the problems of adhesion, demoulding, surface scratch and the like between the continuous casting billet and the crystallizer. Thicker continuous casting billet outer wall can be formed in the continuous casting crystallizer, so that the vibration influence effect of the crystallizer on the vibration of a molten pool in the crystallizer is very small.
The vibrating twin-roll strip casting and rolling machine adopts a vibration mode to one casting roll forming a molten pool, so that the solidification mechanism is changed, the position of a solidification end point is lifted to form a solidification end surface, and the casting and rolling speed can be improved. Meanwhile, the method has the functions of homogenizing components and eliminating internal cracking and segregation, and can greatly improve the product quality. However, the vibrating type twin-roll strip casting machine adopts a mode that one casting roll vibrates, the other casting roll is in a fixed mode, the influence of the vibration on a molten pool in the casting rolls is non-uniform, and the influence of the two casting rolls serving as the side walls of a crystallizer of the molten pool on the metal solidification process in the molten pool is inconsistent. Therefore, the prior art has certain defects and further space for improvement and perfection.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a device and a method for controlling solidification by vibration, wherein the entire molten pool for twin-roll strip casting is placed on a vibration generator, the vibration generator applies work to the molten pool, the solidification process is analyzed from the solidification principle, and energy other than the liquid phase and solid phase free energy difference and the surface energy of a crystal blank is applied, so as to influence the solidification process of molten steel, narrow the degree of supercooling, and achieve the purpose of stable solidification.
The technical scheme adopted by the invention is as follows:
the invention provides a device for controlling solidification by adopting vibration, which comprises a crystallizer, a molten pool, a crystallizer base, a cooling system and a vibration generating device, wherein the crystallizer is arranged on the molten pool; the crystallizer sets up the top at the crystallizer base, the crystallizer comprises two counter-rotating's crystallization roller and both ends baffle, and both sides crystallization roller along the axial line contact, the molten bath sets up between the upper portion region of both sides crystallization roller, vibration generating device symmetry respectively sets up both sides around both sides crystallization roller below, just vibration generating device all with the bottom fixed connection of crystallizer base, cooling system sets up tip around both sides crystallization roller respectively.
A method of controlling coagulation using vibration, the method comprising the steps of:
step S1, introducing water into a cooling system, and cooling the crystallizer through the cooling system;
step S2, starting a vibration generating device to enable the crystallizer to synchronously vibrate along with the vibration generating device through a crystallizer base;
step S3, adjusting the period and amplitude of the vibration generating device, and keeping the power of the vibration generating device at 200-240W;
step S4, injecting high-temperature molten steel into a crystallizer consisting of two crystallization rollers rotating in opposite directions and baffles at two ends;
and step S5, the temperature of the molten steel is reduced after passing through the cooled crystallizer, and the molten steel is in a vibration environment with fixed vibration, so that the molten steel is rapidly solidified into a strip billet at a certain temperature higher than the actual solidification temperature of the vibration-free environment.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize the stable control of the solidification process, effectively reduce the free energy difference of liquid and solid phases, improve and accurately solidify the temperature, refine the strip billet crystal grains, has more stable process and higher quality of the formed strip billet, and can better overcome the problem caused by unstable solidification due to small double-roller thin strip casting and rolling molten pool.
Drawings
FIG. 1 is a schematic cross-sectional front view of one embodiment of an apparatus for controlling coagulation using vibration in accordance with the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic diagram showing the relationship between the free energy of the liquid phase and the solid phase and the nucleation;
FIG. 4 is a schematic diagram of the relationship between the liquid phase, solid phase free energy and crystallization temperature;
FIG. 5 is a graph showing the relationship between the critical nucleus radius r and the system free energy Δ G.
Wherein, the reference numbers: 1-a crystallizer; 2-a molten pool; 3-a crystallizer base; 4-a cooling system; 5-a vibration generating device; 6-strip blank; 51-bolt.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.
Referring to fig. 1 and 2, a detailed structure of an embodiment of an apparatus for controlling coagulation using vibration according to the present invention is shown. The device comprises a crystallizer 1, a molten pool 2, a crystallizer base 3, a cooling system 4 and a vibration generating device 5; crystallizer 1 sets up in crystallizer base 3's top, crystallizer 1 comprises at the crystallization roller and the both ends baffle of the inside left and right sides in crystallizer base 3 top by the symmetry setting, and both sides crystallization roller along the axial line contact, molten bath 2 sets up between the upper portion region of both sides crystallization roller, vibration generating device 5 symmetry respectively sets up both sides around both sides crystallization roller below, just vibration generating device 5 all passes through the bottom fixed connection of bolt 51 with crystallizer base 3, cooling system 4 is fixed connection tip around crystallizer 1 respectively.
A method of controlling coagulation using vibration, the method comprising the steps of:
step S1: water is introduced into the cooling system, and the crystallizer is cooled through the cooling system;
step S2: starting the vibration generating device 5 to enable the crystallizer 1 to synchronously vibrate along with the vibration generating device 5 through the crystallizer base 3;
step S3: adjusting the period and amplitude of the vibration generating device 5, and keeping the power of the vibration generating device 5 at 200-;
step S4, injecting high-temperature molten steel into a crystallizer 1 formed by two crystallization rollers rotating in opposite directions and baffles at two ends;
and step S5, the temperature of the molten steel is reduced after passing through the cooled crystallizer 1, and the molten steel is in a vibration environment with fixed vibration, so that the molten steel is rapidly solidified into a strip billet at a certain temperature higher than the actual solidification temperature of the vibration-free environment.
The invention has the following action principle: the high-temperature molten steel is subjected to a solidification process from a liquid phase to a solid phase along with the temperature reduction, a theoretical crystallization temperature Tm and an actual crystallization temperature Tn exist, the difference between the theoretical crystallization temperature Tm and the actual crystallization temperature Tn is the supercooling degree of the high-temperature molten steel, and crystallization is started when the temperature is reduced to Tn. The crystallization process is a process of converting the free energy of the system from high to low. As shown in FIG. 3, the difference in free energy between the liquid phase and the solid phase is Δ GV＝GL-GSIs the driving force of metal crystallization, crystal blanks appear in the crystallization process, and the crystal blanks form surface energy delta GiIs the resistance that the crystallization process needs to overcome, due to Δ GiLess than Δ GVTherefore, the nucleation work is required to compensate for the difference. The volume free energy in the molten steel bath system is
Surface energy of boule formation is Δ Gi＝4πr2Delta, after working-kr for the molten steel bath system by vibration, the system free energy will have the original Δ G ═ Δ Gi+ΔGVBecomes Δ G ═ Δ Gi+ΔGV-kr. Thus, the critical nucleation radius of the solidification process will be defined by rkIs reduced to rk', as shown in FIG. 5. At the same time, the supercooling degree of the solidification process is also reduced from Δ T to Δ T', as shown in fig. 4. Therefore, the invention controls the solidification process to a certain extent by controlling the vibration to work on the molten pool system. Because the vibration is added to the molten pool system under the limit of other conditions, the amplitude limit value of the energy obtained by the molten pool system exists, and therefore the critical nucleation radius minimum value r exists in the solidification process of the molten pool with the increased vibration0Maximum value of actual crystallization temperature T0. The invention controls the vibration to ensure that the actual crystallization temperature of the molten steel in the molten pool is close to T0Thereby increasing and refining the solidification temperature while the critical nucleation radius is reduced and approaches r0And the crystal grains are refined. The solidification process of the molten pool after vibration is increased, the free energy difference of liquid and solid phases is reduced, the crystallization process is more stable than a system without vibration, and the formed strip billet has better quality.
The invention applies the process method of vibration control solidification to the twin-roll thin strip casting technology, a molten pool formed by two casting rolls rotating in opposite directions and two end side sealing plates is placed on a vibration generating device, as shown in figure 1, the vibration generating device provides a vibration source, the molten pool is in the vibration process, and the solidification process of the molten pool in the twin-roll thin strip casting process is stable.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (2)
1. An apparatus for controlling coagulation by vibration, comprising: the device comprises a crystallizer, a molten pool, a crystallizer base, a cooling system and a vibration generating device; the crystallizer sets up the top at the crystallizer base, the crystallizer comprises two counter-rotating's crystallization roller and both ends baffle, and both sides crystallization roller along the axial line contact, the molten bath sets up between the upper portion region of both sides crystallization roller, vibration generating device symmetry respectively sets up both sides around both sides crystallization roller below, just vibration generating device all with the bottom fixed connection of crystallizer base, cooling system sets up tip around both sides crystallization roller respectively.
2. A method of controlling coagulation using vibration, the method comprising the steps of:
step S1, introducing water into a cooling system, and cooling the crystallizer through the cooling system;
step S2, starting a vibration generating device to enable the crystallizer to synchronously vibrate along with the vibration generating device through a crystallizer base;
step S3, adjusting the period and amplitude of the vibration generating device, and keeping the power of the vibration generating device at 200-240W;
step S4, injecting high-temperature molten steel into a crystallizer consisting of two crystallization rollers rotating in opposite directions and baffles at two ends;
and step S5, the temperature of the molten steel is reduced after passing through the cooled crystallizer, and the molten steel is in a vibration environment with fixed vibration, so that the molten steel is rapidly solidified into a strip billet at a certain temperature higher than the actual solidification temperature of the vibration-free environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653560.7A CN113426967A (en) | 2021-06-11 | 2021-06-11 | Device and method for controlling solidification by adopting vibration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653560.7A CN113426967A (en) | 2021-06-11 | 2021-06-11 | Device and method for controlling solidification by adopting vibration |
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| Publication Number | Publication Date |
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| CN113426967A true CN113426967A (en) | 2021-09-24 |
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| CN202110653560.7A Pending CN113426967A (en) | 2021-06-11 | 2021-06-11 | Device and method for controlling solidification by adopting vibration |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07108353A (en) * | 1993-10-08 | 1995-04-25 | Nippon Steel Corp | Twin roll type continuous casting apparatus and method thereof |
| CN1148526A (en) * | 1995-07-19 | 1997-04-30 | 石川岛播磨重工业株式会社 | Method for making molten metal in two-roller continuous casting machine generate vibration, and apparatus thereof |
| CN101181719A (en) * | 2007-12-07 | 2008-05-21 | 燕山大学 | Oscillatory type double roll strip casting mill |
| US20140262121A1 (en) * | 2013-03-15 | 2014-09-18 | Nucor Corporation | Method of thin strip casting |
| CN107138529A (en) * | 2017-06-30 | 2017-09-08 | 燕山大学 | A kind of ply-metal band solid-liquid vibration casting and rolling installation and method |
| JP2018061966A (en) * | 2016-10-11 | 2018-04-19 | 新日鐵住金株式会社 | Side seal device, twin roll type continuous casting apparatus, and method for producing thin slab |
-
2021
- 2021-06-11 CN CN202110653560.7A patent/CN113426967A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07108353A (en) * | 1993-10-08 | 1995-04-25 | Nippon Steel Corp | Twin roll type continuous casting apparatus and method thereof |
| CN1148526A (en) * | 1995-07-19 | 1997-04-30 | 石川岛播磨重工业株式会社 | Method for making molten metal in two-roller continuous casting machine generate vibration, and apparatus thereof |
| CN101181719A (en) * | 2007-12-07 | 2008-05-21 | 燕山大学 | Oscillatory type double roll strip casting mill |
| US20140262121A1 (en) * | 2013-03-15 | 2014-09-18 | Nucor Corporation | Method of thin strip casting |
| JP2018061966A (en) * | 2016-10-11 | 2018-04-19 | 新日鐵住金株式会社 | Side seal device, twin roll type continuous casting apparatus, and method for producing thin slab |
| CN107138529A (en) * | 2017-06-30 | 2017-09-08 | 燕山大学 | A kind of ply-metal band solid-liquid vibration casting and rolling installation and method |
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Application publication date: 20210924 |