CN108188366B - Magnesium alloy semicontinuous casting grain refinement device and method - Google Patents
Magnesium alloy semicontinuous casting grain refinement device and method Download PDFInfo
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- CN108188366B CN108188366B CN201810203536.1A CN201810203536A CN108188366B CN 108188366 B CN108188366 B CN 108188366B CN 201810203536 A CN201810203536 A CN 201810203536A CN 108188366 B CN108188366 B CN 108188366B
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a magnesium alloy semi-continuous casting grain refinement device and a magnesium alloy semi-continuous casting grain refinement method. The device is applied to semi-continuous casting equipment, fixedly arranged above a crystallizer of the casting equipment, and the grain refining device comprises: silicon steel laminated hollow iron core, coil and insulating ceramic fiber; the silicon steel laminated hollow iron core is sleeved on the outer surface of a liquid inlet guide pipe of the casting equipment, and a gap with a set distance is formed between the silicon steel laminated hollow iron core and the outer surface of the guide pipe; the coil is wound around the silicon steel laminated hollow iron core; the insulating ceramic fiber is arranged between the coil and the silicon steel laminated hollow iron core, and insulates the coil from the silicon steel laminated hollow iron core. And electromagnetic energy treatment is carried out on the molten liquid through the grain refining device, so that the grain size of the casting blank is reduced and uniform, and the quality of the casting blank is improved.
Description
Technical Field
The invention relates to the technical field of metal solidification, in particular to a magnesium alloy semi-continuous casting grain refinement device and method.
Background
In order to obtain a wrought magnesium alloy molded article excellent in performance, it is necessary to use a wrought magnesium alloy initial ingot having good quality. The deformed magnesium alloy ingot blank obtained by the semi-continuous casting commonly used has the problems of coarse structure, uneven size, segregation and serious surface oxidation, is not beneficial to the subsequent hot working of the ingot blank, and can also influence the performance of the product.
In the prior art, the uniformity of the structure and the mechanical property of the structure are improved by a grain refinement method, the formability in the subsequent processing process can be improved, and the grain size after recrystallization is fine and uniform. Therefore, grain refinement is an important method for improving the quality of wrought magnesium alloy ingots.
In the prior art, the method for refining the crystal grains in the magnesium alloy semi-continuous casting process mainly comprises a method for adding a crystal grain refiner, so that the degree of refining the crystal grains of the deformed magnesium alloy cast ingot is low, the refining effect is unstable, and the quality of the deformed magnesium alloy cast ingot is poor.
Disclosure of Invention
The invention aims to provide a magnesium alloy semi-continuous casting grain refinement device and method capable of improving casting blank quality.
In order to achieve the above object, the present invention provides the following solutions:
a magnesium alloy semi-continuous casting grain refining apparatus, the grain refining apparatus is applied to a semi-continuous casting device, and is fixedly arranged above a casting device crystallizer, the grain refining apparatus comprises: silicon steel laminated hollow iron core, coil and insulating ceramic fiber;
the silicon steel laminated hollow iron core is sleeved on the outer surface of a liquid inlet guide pipe of the casting equipment, and a gap with a set distance is formed between the silicon steel laminated hollow iron core and the outer surface of the guide pipe;
the coil is wound around the silicon steel laminated hollow iron core;
the insulating ceramic fiber is arranged between the coil and the silicon steel laminated hollow iron core, and insulates the coil from the silicon steel laminated hollow iron core.
Optionally, the coil is a copper wire with a hollow inside, the hollow part of the copper wire is a cooling water cavity, one end of the copper wire is a coil cooling water inlet, and the other end of the copper wire is a coil cooling water outlet.
Optionally, the grain refinement device further includes: the coil and the silicon steel laminated hollow iron core are fixed on the support, and the coil and the silicon steel laminated hollow iron core are fixed on a crystallizer of casting equipment by the support.
Optionally, an absolute distance between the lower surface of the silicon steel laminated hollow iron core and the upper surface of the magnesium alloy melt in the crystallizer of the casting equipment is smaller than 10mm.
Optionally, the grain refinement device further includes: and the pulse power supply is connected with the coil and provides pulse current for the coil.
In order to achieve the above object, the present invention further provides the following solutions:
the refining method is applied to the magnesium alloy semi-continuous casting grain refining device, and specifically comprises the following steps:
fixing the refining device above a crystallizer of the casting equipment;
after the magnesium alloy is melted in a smelting furnace, pouring the melt into a crystallizer of the casting equipment through a guide pipe of the casting equipment;
introducing pulse rectangular waves into the coil, and carrying out electromagnetic energy treatment on the melt to obtain an electromagnetic melt;
and crystallizing and cooling the electromagnetic melt to obtain the ingot with refined crystal grains.
Optionally, the method further comprises:
after the pulse rectangular wave is introduced into the coil, cooling water is introduced into a cooling water inlet of the coil.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a magnesium alloy semi-continuous casting grain refinement device and a magnesium alloy semi-continuous casting grain refinement method. The refining device is used for carrying out electromagnetic energy treatment on the melt, and under the action of electromagnetic energy, the number of crystal nuclei in the melt is increased, so that the degree of melt grain refinement is improved, and the mechanical property and deformation property of the cast ingot are improved. The casting blank structure can be thinned, the grain size of the casting blank can be reduced and uniform, and the casting blank quality can be improved.
As the refining degree of melt grains is improved, the micro-cracking degree is lower, and the surface quality of the cast ingot is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a magnesium alloy semi-continuous casting grain refining device provided by the invention;
FIG. 2 is a cross-sectional view of the structure of the magnesium alloy semi-continuous casting grain refining device provided by the invention;
FIG. 3 is a top view of the structure of the magnesium alloy semi-continuous casting grain refining device provided by the invention;
FIG. 4 is a waveform diagram of pulse current of the magnesium alloy semi-continuous casting grain refining device provided by the invention;
FIG. 5 is a numerical simulation calculation vector diagram of current density distribution of the magnesium alloy semi-continuous casting grain refining device;
FIG. 6 is a vector diagram of the magnetic induction intensity distribution of the magnesium alloy semi-continuous casting grain refining device provided by the invention;
fig. 7 is an electromagnetic force vector diagram of the magnesium alloy semi-continuous casting grain refining device provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a magnesium alloy semi-continuous casting grain refinement device and method capable of improving casting blank quality.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a structural view of a magnesium alloy semi-continuous casting grain refining apparatus, fig. 2 is a sectional view of a structure of the magnesium alloy semi-continuous casting grain refining apparatus, and fig. 3 is a plan view of a structure of the magnesium alloy semi-continuous casting grain refining apparatus.
As shown in fig. 1, 2 and 3, a magnesium alloy semi-continuous casting grain refining apparatus, the grain refining apparatus is applied to a semi-continuous casting device and fixedly arranged above a crystallizer of the casting device, and the grain refining apparatus comprises: silicon steel laminated hollow iron core 24, coil 25, insulating ceramic fiber 28.
The silicon steel laminated hollow iron core 24 is sleeved on the outer surface of the liquid inlet guide pipe 2 of the casting equipment, and a gap with a set distance is formed between the silicon steel laminated hollow iron core and the outer surface of the guide pipe 2.
The coil 25 is wound around the silicon steel laminated hollow core 24.
The grain refining device applies a surface pulse rectangular wave electromagnetic energy to the magnesium alloy melt entering the crystallizer 21 and the upper surface of the cast ingot 29 through the flow conduit 2, the electromagnetic energy can promote nucleation, improve nucleation rate, realize uniform refinement of crystal grains of a solidification structure, not only improve nucleation rate, but also promote crystal growth to be changed from columnar crystal to equiaxed crystal growth, the crystal grains can be obviously refined, and the crystal grain sizes in the cast ingot are more refined and uniformly distributed, so that the cast ingot with high quality is obtained, and the method has the advantages of simple process, low cost and convenience in operation.
The temperature of the melt processed by the grain refining device is 650 ℃, and the pulling speed of the cast ingot in the casting process is 60mm/min.
The insulating ceramic fibers 28 are disposed between the coil 25 and the silicon steel laminated hollow core 24, and the insulating ceramic fibers 28 insulate the coil 25 from the silicon steel laminated hollow core 24.
As shown in fig. 2, the coil 25 is a copper wire with a hollow interior, the hollow portion of the copper wire is a cooling water cavity, one end of the copper wire is a coil cooling water inlet 23, and the other end of the copper wire is a coil cooling water outlet 26.
As shown in fig. 1, the grain refinement apparatus further includes: the support 1, coil 25 with silicon steel lamination hollow core 24 is fixed on support 1, support 1 will coil 25 with silicon steel lamination hollow core 24 is fixed on the crystallizer of casting equipment.
As shown in fig. 1 and 2, the absolute distance between the lower surface of the silicon steel laminated hollow iron core 24 and the upper surface of the magnesium alloy melt in the crystallizer of the casting equipment is smaller than 10mm, so that the magnetic loss is reduced, and the surface pulse rectangular wave magnetic field does not contact the magnesium alloy melt, so that no pollution is generated to the magnesium alloy melt and no pollution is generated to the environment.
Fig. 4 is a waveform diagram of pulse current of the magnesium alloy semi-continuous casting grain refining apparatus.
As shown in fig. 4, the grain refining apparatus further includes: the pulse power supply is connected with the coil 25, provides pulse current for the coil 25, has a pulse peak value of 100A, has a pulse current duty ratio of 20%, has a pulse frequency of 20Hz, adopts low-frequency low-voltage power supply, has simple equipment and safe operation, can be directly installed and used on original equipment of a factory, and saves cost and investment.
Before the electromagnetic pulse semicontinuous casting starts, two ends of a hollow copper coil are respectively connected with two poles of a pulse power supply, cooling water of the hollow copper coil 25 and the crystallizer 21 is started, when pulse current is introduced into the hollow copper coil 25, the hollow copper coil 25 excites the silicon steel laminated hollow iron core 24 to generate a pulse magnetic field, and electromagnetic energy treatment is carried out on a magnesium metal melt.
The electromagnetic pulse grain refining device is arranged above the crystallizer, and can be applied to the semi-continuous casting production process of magnesium alloys with different sizes and different brands.
Fig. 5 is a vector diagram of the current density distribution numerical simulation calculation of the magnesium alloy semi-continuous casting grain refining device, and as shown in fig. 5, when the grain refining device works, the current density diagram in the hollow coil 25 and the magnesium alloy cast ingot 29 is shown, the number of turns of the hollow coil 25 is 90 turns, and rectangular wave pulse current with the current peak value of 100A, the frequency of 20Hz and the duty ratio of 50% is introduced.
Fig. 6 is a vector diagram of magnetic induction distribution of a magnesium alloy semi-continuous casting grain refining device, and as shown in fig. 6, the magnetic induction distribution in an ingot is larger in core magnetic induction and smaller in side parts during electromagnetic pulse treatment, so that the problem of small supercooling degree of the core can be solved.
Fig. 7 is an electromagnetic force vector diagram of a magnesium alloy semi-continuous casting grain refinement device, as shown in fig. 7, when electromagnetic pulse treatment is performed on a magnesium alloy melt, electromagnetic force distribution in the magnesium alloy melt generates electromagnetic force directed to edges on the grains on the basis of electromagnetic energy infiltration, has extrusion effect on the magnesium alloy melt grains, limits growth behavior of the magnesium alloy melt grains, and has good grain refinement effect.
In order to achieve the above object, the present invention further provides the following solutions:
the refining method is applied to the magnesium alloy semi-continuous casting grain refining device, and specifically comprises the following steps:
fixing the refining device above a crystallizer of the casting equipment;
after the magnesium alloy is melted in a smelting furnace, pouring the melt into a crystallizer of the casting equipment through a guide pipe of the casting equipment;
introducing pulse rectangular waves into the coil, and carrying out electromagnetic energy treatment on the melt to obtain an electromagnetic melt;
and crystallizing and cooling the electromagnetic melt to obtain the ingot with refined crystal grains.
Optionally, the method further comprises:
after the pulse rectangular wave is introduced into the coil, cooling water is introduced into a cooling water inlet of the coil.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. The utility model provides a magnesium alloy semi-continuous casting grain refines device, its characterized in that, the grain refines device is applied to semi-continuous casting equipment, fixedly set up in the top of casting equipment crystallizer, the grain refines device includes: silicon steel laminated hollow iron core, coil and insulating ceramic fiber;
the silicon steel laminated hollow iron core is sleeved on the outer surface of a liquid inlet guide pipe of the casting equipment, and a gap with a set distance is formed between the silicon steel laminated hollow iron core and the outer surface of the guide pipe; the magnesium alloy melt flows through the liquid inlet conduit and enters the crystallizer;
the coil is wound around the silicon steel laminated hollow iron core;
the insulating ceramic fiber is arranged between the coil and the silicon steel laminated hollow iron core, and insulates the coil from the silicon steel laminated hollow iron core;
further comprises: the pulse power supply is connected with the coil and used for providing pulse current for the coil;
further comprises: the coil and the silicon steel laminated hollow iron core are fixed on the support, and the coil and the silicon steel laminated hollow iron core are fixed on a crystallizer of casting equipment by the support.
2. The magnesium alloy semicontinuous casting grain refining device according to claim 1, wherein the coil is a copper wire with a hollow inside, the hollow part of the copper wire is a cooling water cavity, one end of the copper wire is a coil cooling water inlet, and the other end of the copper wire is a coil cooling water outlet.
3. The magnesium alloy semi-continuous casting grain refining apparatus according to claim 1, wherein an absolute distance between a lower surface of the silicon steel laminated hollow core and an upper surface of a magnesium alloy melt in a crystallizer of the casting equipment is less than 10mm.
4. A method for refining magnesium alloy semi-continuous casting grains, which is applied to the magnesium alloy semi-continuous casting grain refining device as claimed in any one of claims 1 to 3, and is characterized by comprising the following steps:
fixing the grain refining device above a crystallizer of the casting equipment;
after the magnesium alloy is melted in a smelting furnace, pouring the melt into a crystallizer of the casting equipment through a guide pipe of the casting equipment;
introducing pulse rectangular waves into the coil, and carrying out electromagnetic energy treatment on the melt to obtain an electromagnetic melt;
and crystallizing and cooling the electromagnetic melt to obtain the ingot with refined crystal grains.
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| CN201810203536.1A CN108188366B (en) | 2018-03-13 | 2018-03-13 | Magnesium alloy semicontinuous casting grain refinement device and method |
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| CN201810203536.1A CN108188366B (en) | 2018-03-13 | 2018-03-13 | Magnesium alloy semicontinuous casting grain refinement device and method |
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| CN108188366B true CN108188366B (en) | 2023-07-07 |
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| CN111842821B (en) * | 2020-07-30 | 2021-11-23 | 鼎镁新材料科技股份有限公司 | Electromagnetic treatment method for melt cast by aluminum alloy flow table |
| CN114406220A (en) * | 2022-01-25 | 2022-04-29 | 内蒙古科技大学 | Electrical aluminum conductor and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4972899A (en) * | 1990-01-02 | 1990-11-27 | Olin Corporation | Method and apparatus for casting grain refined ingots |
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| SE321056B (en) * | 1965-10-04 | 1970-02-23 | Metall Z Im V | |
| ZA813647B (en) * | 1980-06-05 | 1982-07-28 | Ti Ltd | Electromagnetic stirring |
| SU973222A1 (en) * | 1981-05-29 | 1982-11-15 | Предприятие П/Я В-2996 | Apparatus for electromagnetic stirring of metals |
| CN102294445B (en) * | 2011-08-17 | 2013-06-05 | 中国科学院金属研究所 | Auxiliary semi-continuous casting crystallizer for low-frequency pulsed magnetic field of magnesium alloy and application thereof |
| JP5551297B1 (en) * | 2013-08-08 | 2014-07-16 | 高橋 謙三 | Molding device for continuous casting with stirring device |
| CN105382227B (en) * | 2015-11-30 | 2017-12-19 | 中国科学院长春应用化学研究所 | A kind of part flow arrangement and casting system for magnesium alloy semi-continuous casting |
| CN208811049U (en) * | 2018-03-13 | 2019-05-03 | 内蒙古科技大学 | A kind of magnesium alloy semicontinuous casting crystal grain fining device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4972899A (en) * | 1990-01-02 | 1990-11-27 | Olin Corporation | Method and apparatus for casting grain refined ingots |
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