CN110576162A - lithium element adding method in aluminum-lithium alloy semi-continuous casting - Google Patents
lithium element adding method in aluminum-lithium alloy semi-continuous casting Download PDFInfo
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- CN110576162A CN110576162A CN201910974972.3A CN201910974972A CN110576162A CN 110576162 A CN110576162 A CN 110576162A CN 201910974972 A CN201910974972 A CN 201910974972A CN 110576162 A CN110576162 A CN 110576162A
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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
- B22D11/003—Aluminium alloys
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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
- B22D11/108—Feeding additives, powders, or the like
Abstract
the invention relates to a new adding method for reducing burning loss of volatile alloy element lithium in the aluminum-lithium alloy semi-continuous casting process, which comprises the following steps: (1) heating and melting solid raw materials such as aluminum, magnesium, copper and the like according to an alloy proportion without adding lithium element to form liquid metal; (2) feeding the liquid metal into a standing furnace for fully standing; (3) feeding liquid metal into a SNIF dehydrogenation furnace for dehydrogenation, and adding a grain refiner; (4) conveying the liquid metal into an induction melting furnace protected by argon; (5) adding pure lithium to the alloy in the induction melting furnace and properly adjusting other alloy components to obtain liquid metal with target aluminum-lithium alloy components; (6) the liquid metal is sent to a casting platform protected by argon through a conveying groove for semi-continuous casting.
Description
Technical Field
the invention is suitable for the fusion casting production of lithium-containing aluminum alloy, the product form is cast ingot (round or flat), the cast ingot can be used as a raw material in the processing processes of extrusion, rolling, forging and the like, and the final application can be used as a part material in the fields of aerospace and the like.
background
Due to the chemical activity of lithium, lithium must be produced by melting and casting under a protective atmosphere, usually with inert gas or vacuum, in order to prevent oxidation and explosion accidents. The melting temperature of the alloy is generally 700-730 ℃, the transfer pipeline needs to have high temperature resistance, corrosion resistance and other performances, and a stainless steel pipe and silicon felt cotton are usually adopted.
the aluminum-lithium alloy casting process is relatively complex, but due to the low density, high specific strength and specific stiffness, excellent low-temperature mechanical property, high-temperature strength and the like, good fatigue resistance, certain superplasticity forming property and the like, the aluminum-lithium alloy casting process has the effects of replacing the conventional aluminum alloy, reducing weight by about 15% and improving stiffness by about 15%, so that the performance improvement and economic benefit brought to the design of aerospace aircrafts are very obvious, and the aluminum-lithium alloy casting process is more and more widely applied as a high-end new material. For example, in the design of an airplane, an aluminum-lithium alloy plate can be used as a skin and a wall plate, an extruded section can be used as parts such as a stringer, a reinforcing rib and a floor beam, and the traditional aluminum alloy is replaced to reduce the weight and improve the performance of the airplane. In the design of the rocket, the aluminum-lithium alloy can be used as a fuel tank and a liquid oxygen tank, the excellent forming performance is convenient for manufacturing a common-bottom storage tank, the effective load can be increased, the height of the rocket can be reduced, and the overall performance of the rocket can be improved.
at present, the casting technology of the aluminum lithium alloy mastered by various countries has differences and different methods, but a semicontinuous casting process is basically adopted for the production of large-size ingots, and the key processing process comprises three steps: (1) smelting from solid raw materials to liquid metal; (2) liquid metal treatment, including alloying, homogenization, cleaning, and degassing; (3) the casting process from liquid to solid ingot. A large number of practices prove that any stage of the three steps does not operate according to scientific rules, and the production accidents such as the ingot containing a large number of unqualified defects appear on the light side and the explosion and the like appear on the heavy side.
U.S. Pat. No. 4,556,535, obtained by aluminum industries, 1985, controls the quantitative addition of lithium element before a degassing device mainly by measuring the casting speed, thereby effectively reducing the oxidation burning loss of lithium element and improving the product quality. The method has the disadvantages that only one-stage dehydrogenation is carried out, the aluminum alloy without lithium has higher hydrogen content, the dehydrogenation is insufficient after the aluminum alloy is mixed with lithium, and the casting defects are more.
U.S. Pat. No. 4,761,266, available from Kaiser aluminum corporation, 1988, was prepared by measuring the casting speed, adding liquid lithium to a lithium-free aluminum alloy liquid by vortexing, followed by primary degassing, followed by secondary degassing, using a stainless steel filter, and removing oxides before entering an argon-shielded casting station. The improvement of the method is that the hydrogen content is effectively controlled by removing hydrogen twice; fully mixing lithium and aluminum alloy solution through eddy current; while a portion of the oxide inclusions are removed by the filter. However, this method has the disadvantage that temperature has a large effect on the quality of the cast composition, such as homogeneity and inclusions, since the viscosity of the alloy is a function of temperature.
chinese patents CN105102643 and CN105358723, obtained from the love rolling products german limited company, are similar to the patents in the united states aluminum industry and kaiser aluminum industry, and implement effective application of lithium by separating lithium-free aluminum alloy melting from lithium-containing aluminum alloy melting, except that it does not use vortex mixing, and does not perform degassing after mixing, and directly performs casting. In addition, it divides the casting into three alloys, only the middle part of the casting being an aluminum lithium alloy. The invention has the advantages that the operation is simple, a complex degassing and filtering device is not needed, and the head and the tail of the cast ingot can be cut off in the subsequent processing, thereby effectively improving the utilization rate of the lithium-containing alloy. The invention has the disadvantage that because only the melt without lithium is degassed and the aluminum alloy containing lithium is not degassed and filtered, a large amount of inclusions flowing into the ingot are difficult to avoid to form defects. In addition, the three alloys are prepared respectively, protective atmosphere and protective salt are used alternately, errors are difficult to avoid in actual production, and especially particles of the protective salt are difficult to remove by a conventional filter.
in recent two years, with the mass use of third-generation aluminum lithium alloys by air passenger car companies and SpaceX companies, many aluminum alloy companies build new aluminum lithium alloy casting production lines to meet the market demand for the new material. Mature alloy marks are wide, and the improvement of the casting process can not only improve the product quality, but also avoid accidents and reduce risks.
disclosure of Invention
the invention aims to provide a set of whole casting process flow and a control method of aluminum alloy round ingots and flat ingots containing lithium elements.
the whole process flow for preparing lithium-containing aluminum alloy round ingots and flat ingots with the length of L1+ L2+ L3 comprises the following three steps (as shown in a flow chart of figure 1):
(a) The ingot length is zero, and the casting is carried out from the beginning to the length L1 by adopting the following steps:
i. According to the chemical composition proportion of the alloy without lithium element, melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1, and removing impurities;
ii, transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
Transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
transferring the aluminum alloy subjected to degassing to a filter 10 for impurity removal treatment;
v. the filtered aluminium alloy is sent through a sealed pipe to an argon-shielded casting station 8 for semi-continuous casting to a casting length L1.
(b) The ingot reaches the length of L1, and an ingot with the length of L1+ L2 is cast, and the following steps are adopted:
i. melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1 according to the chemical component proportion of the alloy under the condition of not containing lithium elements, and removing impurities;
ii, transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
Transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
iv, melting and deslagging the solid lithium by using an induction melting furnace 4 under the protection of argon;
v, feeding the aluminum alloy after dehydrogenation into an induction smelting furnace from the SNIF in the step (3) through a closed pipeline, and feeding liquid lithium after smelting and deslagging under the protection of argon into a large induction smelting furnace under the protection of argon from the induction smelting furnace in the step (4) through a closed pipeline to be mixed with the aluminum alloy without lithium;
vi, refining the lithium-containing aluminum alloy, detecting chemical components, adding other components according to conditions to meet the requirements of target components, and then sending the mixture into a filter 6 to remove impurity particles;
feeding the filtered aluminum-lithium alloy into a rotary spraying degasser 9 rotating at a low speed for on-line dehydrogenation (SNIF);
delivering the aluminum lithium alloy after hydrogen removal to a casting table 8 protected by argon through a sealed pipeline for semi-continuous casting, wherein the casting length is L2;
and ix, any danger hidden trouble occurs in casting, and the aluminum lithium alloy is sent into a collector 9 for storage.
(c) when the length of the ingot reaches L1+ L2, the ingot with the length of L1+ L2+ L3 is cast, and the following steps are adopted:
i. when the casting length reaches L2, closing a valve, and opening the valve to enable the liquid aluminum alloy without lithium to flow into a semi-continuous casting table after high-speed dehydrogenation and filtration;
the filtered aluminum alloy was sent through a sealed pipe to an argon blanketed casting station for semi-continuous casting to a casting length of L3.
the whole process flow for preparing the lithium-containing aluminum alloy round ingot and the flat ingot with the length of L1+ L2+ L3 comprises the following control methods:
i. Molten metal transmission flow control device (c) needs no argon protection, and other control devices (c) -r all adopt sealed argon protection measures;
II, in the casting stage of the lithium-free aluminum alloy, opening the control valve and closing all other valves;
III, opening a ((R) controlling valves and simultaneously closing all other valves) in the lithium-containing aluminum alloy casting stage;
IV, in the stage of casting the lithium-containing aluminum alloy, the valves are controlled by opening the third valve and the fourth valve, and all other valves are closed simultaneously;
v. the speed of the semi-continuous ingot which vertically moves downwards is controlled by a hydraulic device, and is continuously changed according to specific alloy components and performance requirements, the liquid level is kept stable in the transition stage from L1 to L1+ L2, and from L1+ L2 to L1+ L2+ L3;
vi, in the casting process, once the liquid level is changed greatly and the cast ingot is leaked, the valve is immediately closed (r) () and the control valves (r) () and (c) are immediately opened to collect the aluminum alloy liquid in an emergency.
the whole process for preparing lithium-containing aluminum alloy round ingots and flat ingots with the lengths of L1+ L2+ L3 needs the following equipment:
i. Active lithium is protected by inert gas in the process of melting solid raw materials, conveying and casting, and argon is preferred;
an induction melting furnace and a direct chill casting station comprising an argon shield;
a control system for dynamically adjusting the content of lithium in the induction smelting furnace according to the casting speed and the content of lithium fed back by the casting table;
A chemical composition detection and verification device comprising a standing stage, a dehydrogenation stage, a smelting stage and a casting stage;
v. including the control valve and control software of R & lt- & gt, realize the steady transition of the metal liquid component under the condition of not interrupting the metal liquid flow and not causing the casting liquid level fluctuation;
vi, the content of lithium in alloy components at the head and tail of the ingot is less than 0.1%, and except for the original material intercalated lithium, lithium is not considered to be added;
the content of the alloy component lithium in the middle of the ingot varies from 0.1% to 20%;
a metal filter comprising a lithium-containing liquid and a ceramic foam filter for a lithium-free metal liquid;
a metal degassing device comprising high-speed non-argon protection and low-speed argon protection;
a molten metal collector comprising an argon shield.
the casting process and the control method of the invention are characterized in that lithium-containing aluminum alloy round ingots and flat ingots of L1+ L2+ L3 are prepared, after the lithium-containing aluminum alloy round ingots and flat ingots are completely solidified, the lithium-containing aluminum alloy round ingots and flat ingots are moved out of a casting well, the bottom of the length of L1 and the top of the length of L3 are cut off before homogenization, and after the surface of the ingot of the length of L2 is milled, flat ingot rolling or round ingot extrusion molding is carried out.
the method is particularly suitable for the third generation and the new generation of aluminum lithium alloy casting, and can be used for preparing 2XXX, 5XXX, 7XXX and 8XXX series aluminum alloys, such as but not limited to AA2050, AA2060, AA2090, AA2099, AA2097, AA2195, AA2197, AA2198, AA8090, 5A90 and other alloys.
the present invention is not limited to the above-described embodiments, and is applicable to various casting processes such as direct chill casting, horizontal continuous casting, thin strip casting, etc., and the method of adding lithium and the control strategy are not changed regardless of the change of the casting form, and thus is widely applicable within the scope of the present invention defined by the appended claims.
drawings
FIG. 1 is a flow chart of the whole process for preparing lithium-containing aluminum alloy round ingots and flat ingots with the length of L1+ L2+ L3.
Detailed Description
the invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Example 1
the whole process flow for preparing lithium-containing aluminum alloy round ingots and flat ingots with the length of L1+ L2+ L3 comprises the following three steps (as shown in a flow chart of figure 1):
(a) the ingot length is zero, and the casting is carried out from the beginning to the length L1 by adopting the following steps:
vi, according to the chemical component proportion of the alloy under the condition of not containing lithium elements, melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1, and removing impurities;
transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
Transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
ix, transferring the aluminum alloy after degassing to a filter 10 for impurity removal treatment;
x. the filtered aluminum alloy was sent through a sealed pipe to an argon-shielded casting station 8 for semi-continuous casting to a casting length of L1.
(b) The ingot reaches the length of L1, and an ingot with the length of L1+ L2 is cast, and the following steps are adopted:
x, melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1 according to the chemical component proportion of the alloy under the condition of not containing lithium elements, and removing impurities;
transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
xiii, under the protection of argon, melting and deslagging the solid lithium by using an induction melting furnace 4;
feeding the aluminum alloy after dehydrogenation into an induction melting furnace from the SNIF in the step (3) through a closed pipeline, and feeding liquid lithium after melting and deslagging under the protection of argon into a large induction melting furnace under the protection of argon from the induction melting furnace in the step (4) through a closed pipeline to be mixed with the aluminum alloy without lithium;
xv. refining the lithium-containing aluminum alloy, detecting chemical components, adding other components according to the situation to meet the requirements of target components, and then sending into a filter 6 to remove the impurity particles;
xvi, feeding the filtered aluminum-lithium alloy into a rotary spraying degasser 9 rotating at a low speed to carry out on-line dehydrogenation (SNIF);
xvii, conveying the aluminum lithium alloy after hydrogen removal to a casting table 8 protected by argon through a sealed pipeline, and performing semi-continuous casting to obtain a casting length L2;
xviii. any danger hazard in the casting, the aluminium-lithium alloy is sent to a collector 9 for storage.
(c) when the length of the ingot reaches L1+ L2, the ingot with the length of L1+ L2+ L3 is cast, and the following steps are adopted:
when the casting length reaches L2, a valve is closed, and the aluminum alloy without lithium is opened to realize that the liquid aluminum alloy after high-speed dehydrogenation and filtration flows into a semi-continuous casting table;
sending the filtered aluminum alloy to an argon-protected casting station through a sealed pipeline,
semi-continuous casting was performed to cast length L3.
the whole process flow for preparing the lithium-containing aluminum alloy round ingot and the flat ingot with the length of L1+ L2+ L3 comprises the following control methods:
a molten metal transmission flow control device (III) does not need argon protection, and other control devices (IV) -R all adopt sealed argon protection measures;
viii, in the casting stage of the lithium-free aluminum alloy, opening the control valve and closing all other valves;
in the lithium-containing aluminum alloy casting stage, a valve is controlled by opening a first valve, a fourth valve and all other valves are closed simultaneously;
In the casting stage of the lithium-containing aluminum alloy, a first valve is opened, a second valve is opened, a third valve is opened, and all other valves are closed simultaneously;
The speed of the semi-continuous ingot casting moving vertically downwards is controlled by a hydraulic device, and is continuously changed according to specific alloy components and performance requirements, the liquid level is kept stable in the transition stage from L1 to L1+ L2, and from L1+ L2 to L1+ L2+ L3;
xi, in casting process, once the liquid level is changed greatly and the cast ingot is leaked, the valve is closed immediately (r) () and the control valves (r) and (c) are opened immediately to collect the aluminium alloy liquid promptly.
the whole process for preparing lithium-containing aluminum alloy round ingots and flat ingots with the lengths of L1+ L2+ L3 needs the following equipment:
active lithium is protected by inert gas, preferably argon gas, in the process of melting solid raw materials, conveying and casting;
An induction smelting furnace and a direct chill casting table comprising argon protection;
a control system for dynamically adjusting the content of lithium in the induction smelting furnace according to the casting speed and the content of lithium fed back by the casting table;
xiv. chemical composition detection and approval apparatus including at the stage of standing, dehydrogenation, smelting, casting;
xv. comprises (r) -R control valve and control software, to realize the stable transition of metal liquid without interrupting the metal liquid flow and causing the casting liquid level fluctuation;
xvi, the content of lithium in alloy components at the head and tail of the ingot is less than 0.1%, and except for the original material doped with lithium, lithium is not considered to be added;
xvii. the content of the alloy component lithium in the middle of the ingot varies from 0.1% to 20%;
a metal filter comprising a lithium-containing liquid and a ceramic foam filter for a lithium-free metal liquid;
a metal degassing device comprising a high-speed non-argon shield and a low-speed argon shield;
xx. includes an argon blanketed molten metal collector.
the casting process and the control method of the invention are characterized in that lithium-containing aluminum alloy round ingots and flat ingots of L1+ L2+ L3 are prepared, after the lithium-containing aluminum alloy round ingots and flat ingots are completely solidified, the lithium-containing aluminum alloy round ingots and flat ingots are moved out of a casting well, the bottom of the length of L1 and the top of the length of L3 are cut off before homogenization, and after the surface of the ingot of the length of L2 is milled, flat ingot rolling or round ingot extrusion molding is carried out.
The method is particularly suitable for the third generation and the new generation of aluminum lithium alloy casting, and can be used for preparing 2XXX, 5XXX, 7XXX and 8XXX series aluminum alloys, such as but not limited to AA2050, AA2060, AA2090, AA2099, AA2097, AA2195, AA2197, AA2198, AA8090, 5A90 and other alloys.
the present invention is not limited to the above-described embodiments, and is applicable to various casting processes such as direct chill casting, horizontal continuous casting, thin strip casting, etc., and the method of adding lithium and the control strategy are not changed regardless of the change of the casting form, and thus is widely applicable within the scope of the present invention defined by the appended claims.
Claims (5)
1. the length is L1+ L2+ L3, and the whole process flow and the control method of the aluminum alloy round ingot and the aluminum alloy flat ingot containing lithium element are as follows:
The ingot length is zero, and the casting is carried out from the beginning to the length L1 by adopting the following steps:
(1) According to the chemical composition proportion of the alloy without lithium element, melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1, and removing impurities;
(2) Transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
(3) transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
(4) transferring the aluminum alloy after degassing to a filter 10 for impurity removal treatment;
(5) the filtered aluminum alloy was sent to an argon-shielded casting station 8 through a sealed pipe, and semi-continuously cast to a casting length of L1.
2. The ingot reaches the length of L1, and an ingot with the length of L1+ L2 is cast, and the following steps are adopted:
(1) Melting aluminum ingots and other raw materials by adopting a resistance furnace, an induction melting furnace or a natural gas furnace 1 according to the chemical component proportion of the alloy under the condition of not containing lithium elements, and removing impurities;
(2) transferring the alloy without lithium to a standing furnace 2, detecting chemical components of the alloy, adjusting the chemical component proportion according to calculation, and strictly controlling the content of trace elements;
(3) transferring the lithium-free alloy to a high-speed rotary jet degasser 3 for dehydrogenation (SNIF);
(4) under the condition of argon protection, melting and deslagging solid lithium by using an induction melting furnace 4;
(5) feeding the aluminum alloy subjected to hydrogen removal into an induction melting furnace from the SNIF in the step (3) through a closed pipeline, and feeding liquid lithium subjected to melting and deslagging under the protection of argon into a large induction melting furnace under the protection of argon from the induction melting furnace in the step (4) through a closed pipeline to be mixed with aluminum alloy not containing lithium;
(6) refining the lithium-containing aluminum alloy, detecting chemical components, adding other components according to conditions to meet the requirements of target components, and then sending the mixture into a filter 6 to remove impurity particles;
(7) feeding the filtered aluminum lithium alloy into a rotary spraying type degasser 9 rotating at a low speed to carry out on-line dehydrogenation (SNIF);
(8) The aluminum lithium alloy after dehydrogenation is sent to a casting table 8 protected by argon through a sealed pipeline for semi-continuous casting, and the casting length is L2;
(9) any danger potential occurs in the casting, and the aluminum lithium alloy is sent into a collector 9 for storage.
3. when the length of the ingot reaches L1+ L2, the ingot with the length of L1+ L2+ L3 is cast, and the following steps are adopted:
(1) When the casting length reaches L2, closing a valve, and opening the valve to enable the liquid aluminum alloy without lithium to flow into a semi-continuous casting table after high-speed dehydrogenation and filtration;
(2) the filtered aluminum alloy was sent to an argon-shielded casting station through a sealed pipe and semi-continuously cast to a casting length of L3.
4. the process according to the claims from step 1 to 3, using the following control method:
(1) Molten metal transmission flow control device (c) needs no argon protection, and other control devices (c) -r all adopt sealed argon protection measures;
(2) according to the claim 1, in the casting stage of the lithium-free aluminum alloy, a control valve is opened, and all other valves are closed simultaneously;
(3) according to claim 2, in the lithium-containing aluminum alloy casting stage, a valve is controlled by opening (r), and all other valves are closed at the same time;
(4) according to claim 3, in the lithium-containing aluminum alloy casting stage, the valves are controlled by opening (r), (c) and all other valves are closed at the same time;
(5) the method of claim 1,2 or 3, wherein the speed of the semi-continuous ingot moving vertically downwards is controlled by a hydraulic device, and is continuously changed according to specific alloy compositions and performance requirements, and the liquid level is kept stable in the transition stage of the lengths of L1 to L1+ L2, L1+ L2 to L1+ L2+ L3;
(6) According to the method of claim 2, the liquid level changes greatly, the ingot casting leaks, the valve is immediately opened (r) () is closed, the control valves (nrr) and (c) are immediately opened, and the aluminum alloy liquid is collected urgently.
5. the method of claim 1, employing the following apparatus:
(1) the method of claims 1-3, wherein the active lithium is protected with an inert gas, preferably argon, from the melting of the solid raw material to the transportation and casting;
(2) the method of claims 1-3, comprising an argon shielded induction melting furnace and a direct chill casting station;
(3) the method of any one of claims 1 to 3, comprising dynamically adjusting a control system for the lithium content in the induction melting furnace based on the casting speed and the feedback lithium content from the casting station;
(4) The method as described in 1-3, comprising chemical composition detection and determination devices in the stages of standing, dehydrogenation, smelting and casting;
(5) the process as described in claims 1-3, including (r) -control valve and control software to realize smooth transition of molten metal components without interruption of molten metal flow and fluctuation of casting liquid level;
(6) The method of claims 1-3, wherein the alloy composition of the head and tail of the ingot contains less than 0.1% lithium, and the addition of lithium is not considered except for the inclusion of lithium in the original material;
(7) the method of claims 1-3, wherein the content of the alloy composition lithium in the middle of the ingot varies from 0.1% to 20%;
(8) The method of claims 1-3, comprising a metal filter containing lithium liquid and a ceramic foam filter for lithium-free metal liquid;
(9) the method of claims 1-3, comprising a high-speed non-argon protected and low-speed argon protected metal degassing unit;
(10) the method of claims 1-3, argon protected metal liquid collector.
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