CN104032151B - The EB cold hearth melting method of a kind of TC4 titan alloy casting ingot - Google Patents
The EB cold hearth melting method of a kind of TC4 titan alloy casting ingot Download PDFInfo
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Abstract
Does an EB cold hearth melting method for TC4 titan alloy casting ingot, adopt electron beam cold hearth melting stove, melting large size: 1050mm �� 210mm �� 8000mm? TC4 titanium alloy ingot; Its method is: selects the titanium sponge of different ratios, titanium defective material and pure aluminium, aluminium vanadium master alloy etc. as raw material, when with electron beam cold hearth melting stove melting TC4, raw material is first put into feeder; Then stove each several part is independently closed and vacuumize respectively; Etc.. The present invention has can improve titanium alloy melting efficiency, it is to increase ingot quality, significantly shortens the production time, it is to increase melting quality, reduces energy consumption; The advantage of the above titan alloy casting ingot of Dan Cineng melting 10000kg.
Description
Technical field
The invention belongs to titanium alloy melting processing method technical field.
Background technology
Traditional titanium alloy melting all adopts water jacketed copper crucible, and melting technology mainly contains three kinds of modes:
(1) non-consumable electrode electric arc furnace melting. Alloy melting carries out under vacuum or protection of inert gas, and this technique is mainly the standby electrode of consumbuble-electrode melting refining;
(2) vaccum consumable electrode electric arc furnace melting. The consumable electrode made taking titanium or titanium alloy, as negative electrode, take water jacketed copper crucible as anode. The electrode melted enters crucible with drops, forms molten bath. Weld pool surface is heated by the electric arc simultaneously, and all the time in liquid, the surrounding that bottom contacts with crucible receives forces cooling, produces crystallization from top to bottom. Molten metal in molten bath becomes titanium ingot after solidifying;
(3) vacuum consumable electrode skull crucible melting. It it is the type of furnace of a kind of casting shaped piece that melting and centrifugal casting are joined together. Its maximum feature there is one layer of titanium alloy solids shell, i.e. so-called scull between water jacketed copper crucible and metal melt, in this, as the liner of crucible, for the formation of molten bath storage solutions, avoids crucible to the pollution of titanium alloy liquid. After cast, stay in crucible layer scull, can be used as crucible lining and continue to use;
But, these method processes above are complicated, malfunction, and energy consumption is relatively big, and subsequent machining cost is big, and high and low density inclusions poor removal effect, cannot scale operation TC4 titan alloy casting ingot.
Summary of the invention
The object of the present invention is exactly in order to industrial scale of improving the quality of products, increase, reduces production cost; This method operation controlled, non-environmental-pollution, energy utilization efficiency height flexibly.
It is an object of the invention to be achieved through the following technical solutions.
An EB cold hearth melting method for TC4 titan alloy casting ingot, the present invention adopts electron beam cold hearth melting stove, melting large size: 1050mm �� 210mm �� 8000mmTC4 titanium alloy ingot; Its method is:
Select the titanium sponge of different ratios, titanium defective material and pure aluminium, aluminium vanadium master alloy etc. as raw material, when with electron beam cold hearth melting stove melting TC4, first raw material is put into feeder; Then stove each several part is independently closed and vacuumize respectively; When vacuum reaches the startup condition of electron beam gun, (vacuum tightness is 1.0 �� 10-3HPa), open high-voltage power supply, and unlocking electronic rifle carries out preheating, after preheating completes, unlocking electronic rifle carries out melting, and the power of 1, No. 2 rifle is remained on 300-450kW, and voltage is that raw material is melted by 50kV, the electron beam power of No. 3 rifles is remained on 250-350kW, and melt raw material liquid state is carried out refining purification by voltage 50kV; Alloy liquid fill whole cold bed be about to enter crystallizer time, open the overflow figure of No. 3 electron beam guns, when titanium liquid flows to crystallizer, start No. 4 rifles, power 50kW, voltage 35kV. The electron beam of No. 4 rifles is gathered the position that crystallizer has covered titanium liquid, to keep the molten state of titanium liquid, until crystallizer is covered by titanium liquid completely; And start to carry out drawing ingot, while drawing ingot and increase power and the voltage of No. 4 rifles; When drawing ingot length to reach 100mm, 1,2, No. 3 rifle Modulating Power draws ingot speed to mate, and the power of adjustment No. 4 rifles makes electric current to continuing fusing during the current value of melt raw material; After raw material melting is complete, closing 1,2, No. 3 rifle, close hot spot point, the overflow figure of No. 4 rifles, the size and the power that progressively reduce No. 4 rifle figures carry out feeding. After feeding completes, utilizing 1, No. 2 rifle cold bed surrounding to be cleaned out, then close 1-4 rifle, finally cooling is come out of the stove.
The invention has the beneficial effects as follows, it is to increase TC4 titanium alloy melting efficiency, it is to increase the quality of ingot casting, it is to increase melting quality, reduce energy consumption, reduce cost. After the present invention implements in actual production, production efficiency significantly improves, and energy consumption decline 5%, production capacity improves 80%. The TC4 ingot casting produced meets country's requirement, and quality obviously promotes.
Embodiment
An EB cold hearth melting method for TC4 titan alloy casting ingot, the present invention adopts electron beam cold hearth melting stove, melting large size: 1050mm �� 210mm �� 8000mmTC4 titanium alloy ingot. Its method is:
Select the titanium sponge of different ratios, titanium defective material and pure aluminium, aluminium vanadium master alloy etc. as raw material, when with electron beam cold hearth melting stove melting TC4, first raw material is put into feeder; Then stove each several part is independently closed and vacuumize respectively; When vacuum reaches the startup condition of electron beam gun, (vacuum tightness is 1.0 �� 10-3HPa), open high-voltage power supply, and unlocking electronic rifle carries out preheating, after preheating completes, unlocking electronic rifle carries out melting, and the power of 1, No. 2 rifle is remained on 300-450kW, and voltage is that raw material is melted by 50kV, the electron beam power of No. 3 rifles is remained on 250-350kW, and melt raw material liquid state is carried out refining purification by voltage 50kV; Alloy liquid fill whole cold bed be about to enter crystallizer time, open the overflow figure of No. 3 electron beam guns, when titanium liquid flows to crystallizer, start No. 4 rifles, power 50kW, voltage 35kV. The electron beam of No. 4 rifles is gathered the position that crystallizer has covered titanium liquid, to keep the molten state of titanium liquid, until crystallizer is covered by titanium liquid completely; And start to carry out drawing ingot, while drawing ingot and increase power and the voltage of No. 4 rifles; When drawing ingot length to reach 100mm, 1,2, No. 3 rifle Modulating Power draws ingot speed to mate, and the power of adjustment No. 4 rifles makes electric current to continuing fusing during the current value of melt raw material; After raw material melting is complete, closing 1,2, No. 3 rifle, close hot spot point, the overflow figure of No. 4 rifles, the size and the power that progressively reduce No. 4 rifle figures carry out feeding. After feeding completes, utilizing 1, No. 2 rifle cold bed surrounding to be cleaned out, then close 1-4 rifle, finally cooling is come out of the stove.
Process scheme
Electron beam melting furnace is the specific equipment of high temperature refractory melting and purification. Electron beam melting carries out under a high vacuum, temperature of superheat height during melting, maintains the liquid time long, makes the refining purification effect of material be able to fully effectively carry out. During electron beam melting, mainly there is the floating etc. of volatilization that degassed, decomposition, deoxidation, technology be mingled with and molten impurity in material. Wherein, the floating of molten impurity and be enriched in the top of ingot casting, it is possible to remove when crop. Under vacuo, the negative electrode of electron beam gun is added thermogenesis thermoelectron and is overflowed. Under the effect of acceleration voltage (30kV), electron beam passes from the centre hole of anode, continues motion downwards, through the multi-focusing of magnetic focusing lens and the adjustment of magnetic deflection scanning lens, makes electron beam accurately and intensively bombard the surface of fuel rod. In the temperature of raw material and the surface generation more than 1400 DEG C in molten bath, raw material surface is heated, is melted, is dripped in molten bath. Molten bath is exactly the melt portions of ingot upper end, is water jacketed copper crucible (crystallizer) around it. Adding heat effect due to electron beam, molten bath keeps constantly convection current upper and lower, inside and outside. Along with fusing raw material constantly drip into, weld pool surface constantly rises, and ingot is constantly pulled downwards again by ingot puller, makes the height that weld pool surface keeps certain.
Electron beam melting is a kind of special vacuum metallurgy equipment. Utilize the electron beam gun in stove the high-power electron beam of tens to hundreds of kilowatts can be focused on 1cm2On, produce the high temperature of more than 1400 DEG C. When high-power electron beam focuses on raw material, just by these melting of metal, the object of melting and purification can be reached. Owing to high-temperature area is limited, the metal needs of fusing bit by bit to be dripped the molten bath entered below, through crystallizer cooling, is frozen into ingot. Under the effect of high vacuum and high temperature, gas and impurity in liquid metal evaporate in a large number, thus obtain high purity densification solidify state ingot metal.
Equipment basic parameter
Electron-beam cold bed furnace one
Power: 3150kW
Output: 4000 tons of ingot castings
Product weight: about 10 tons/root
Product specification: 1050mm �� 210mm �� 8000mm.
Claims (1)
1. an EB cold hearth melting method for TC4 titan alloy casting ingot, is characterized in that, adopts electron beam cold hearth melting stove, melting large size: 1050mm �� 210mm �� 8000mmTC4 titanium alloy ingot; Its method is:
Select the titanium sponge of different ratios, titanium defective material and pure aluminium, aluminium vanadium master alloy as raw material, when with electron beam cold hearth melting stove melting TC4, first raw material is put into feeder; Then stove each several part is independently closed and vacuumize respectively; When vacuum reaches the startup condition of electron beam gun and vacuum tightness be 1.0 �� 10-3HPa, open high-voltage power supply, and unlocking electronic rifle carries out preheating, after preheating completes, unlocking electronic rifle carries out melting, and the power of 1, No. 2 rifle is remained on 300-450kW, and voltage is that raw material is melted by 50kV, the electron beam power of No. 3 rifles is remained on 250-350kW, and melt raw material liquid state is carried out refining purification by voltage 50kV; Alloy liquid fill whole cold bed be about to enter crystallizer time, open the overflow figure of No. 3 electron beam guns, when titanium liquid flows to crystallizer, start No. 4 rifles, power 50kW, voltage 35kV; The electron beam of No. 4 rifles is gathered the position that crystallizer has covered titanium liquid, to keep the molten state of titanium liquid, until crystallizer is covered by titanium liquid completely; And start to carry out drawing ingot, while drawing ingot and increase power and the voltage of No. 4 rifles; When drawing ingot length to reach 100mm, 1,2, No. 3 rifle Modulating Power draws ingot speed to mate, and the power of adjustment No. 4 rifles makes electric current to continuing fusing during the current value of melt raw material; After raw material melting is complete, closing 1,2, No. 3 rifle, close hot spot point, the overflow figure of No. 4 rifles, the size and the power that progressively reduce No. 4 rifle figures carry out feeding; After feeding completes, utilizing 1, No. 2 rifle cold bed surrounding to be cleaned out, then close 1-4 rifle, finally cooling is come out of the stove.
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| UA21699U (en) * | 2006-12-11 | 2007-03-15 | Mykola Petrovych Kondratii | Plant for electron-beam recasting of spongy titanium block |
| KR101578458B1 (en) * | 2010-04-21 | 2015-12-18 | 주식회사 엔아이비 | TiAl base intermetallic compound and manufacturing method of the same |
| CN102776390B (en) * | 2012-07-02 | 2013-11-06 | 洛阳双瑞精铸钛业有限公司 | Method for producing titanium slabs efficiently |
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