CN109732044A - It is a kind of to improve TiAl alloy melt flows stable funnel and pouring procedure - Google Patents
It is a kind of to improve TiAl alloy melt flows stable funnel and pouring procedure Download PDFInfo
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- CN109732044A CN109732044A CN201910159428.3A CN201910159428A CN109732044A CN 109732044 A CN109732044 A CN 109732044A CN 201910159428 A CN201910159428 A CN 201910159428A CN 109732044 A CN109732044 A CN 109732044A
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- funnel
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- tial alloy
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Abstract
The present invention discloses a kind of funnel and pouring procedure that improvement TiAl alloy melt flows are stable, it is related to metal casting technique field, the funnel includes antetheca and rear wall, has an accommodating chamber between the antetheca and the rear wall, and the accommodating chamber bottom has a runner；The antetheca is a hemispheroidal half, and the rear wall is an arcwall, and is inclined outwardly at the top of the arcwall.Pouring procedure in the present invention, has great promotional value, and the stability for being poured melt flows during other Ti system alloy-steel castings suitable for improving cold-crucible lacks side, cold shut, cavitations to reduce casting, improves qualified casting.
Description
Technical field
The present invention relates to metal casting technique fields, stable more particularly to a kind of improvement TiAl alloy melt flows
Funnel and pouring procedure.
Background technique
TiAl melt has high chemical activity, reacts with almost all of oxide ceramics, therefore uses oxygen
Compound ceramic crucible, which carries out TiAl alloy melting, can pollute TiAl melt.Cold-crucible can form a laminated gold on sidewall of crucible
Scull guarantees the degree of purity of melt to avoid contact of the sidewall of crucible with alloy melt, is that smelting TiAl alloy master is to be used
Crucible.
When cold-crucible smelting TiAl alloy, melt is in suspended state, and only bottom melt is contacted with crucible.Using cold-crucible
When being poured, first strand of molten metal for entering casting type chamber is poured out with " gushing out " shape by cold-crucible rather than is left along sidewall of crucible
Crucible, melt flow stability is poor, is easy to wrap up in gas before entering casting type chamber, and causes to be involved in type gas hole defect in casting.
In addition, the melt that cold-crucible inclination is poured out is oblique into casting type chamber, this will cause each position filling of casting unevenly, and can
Liquid position can be lacked in casting to occur lacking side and cold shut defect.
The common measure for improving melt flow stability in casting process is that funnel device is used between crucible and casting mold,
But the universals of current casting funnel are that oblique wall segment and runner transition angle are larger, this will cause into first strand of melt of funnel
Disperse in funnel, first burst of melt amount of funnel is on the low side out and cannot flow along the vertical direction., stream not high for the degree of superheat
For the TiAl melt of dynamic property difference, according to the funnel of this structure, the tendency that casting lacks side, cold shut occurs is still very big.And
And since cold crucible melt superheat degree is not high, melt thermal loss caused by funnel is larger.But at present for funnel heat preservation or
Heating measures, usually on hopper walls carry out multiple layers of different materials heating and insulation combination, structure is complicated, be unfavorable for manufacture with
Maintenance.The high feature of TiAl melt chemistry activity, also limits the selection of funnel material.
Summary of the invention
To improve the stability that cold-crucible is poured melt flows during TiAl alloy casting, the present invention provides one kind and changes
Kind TiAl alloy melt flows stable funnel and pouring procedure.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of funnel that improvement TiAl alloy melt flows are stable, and the funnel includes antetheca with after
Wall, has an accommodating chamber between the antetheca and the rear wall, the accommodating chamber bottom has a runner；The antetheca is
One hemispheroidal half, the rear wall is an arcwall, and is inclined outwardly at the top of the arcwall.
Optionally, it is detachably connected between the runner and the accommodating chamber.
Optionally, the angle being inclined outwardly at the top of the arcwall is 70-85 °.
Optionally, the draw ratio of the runner is 1~5.
Optionally, the flow diameter is 0.3-0.6 times of casting sprue diameter.
Optionally, the funnel is made of graphite material.
Optionally, coil is provided with outside the funnel, the coil is used for induction heating.
Optionally, the funnel is additionally provided with outwardly extending extension.
The present invention also provides a kind of pouring procedures using funnel described in claim 1-9, comprising the following steps:
First, master alloy is placed in cold crucible, casting shell molds are placed on designated position in pouring furnace；
Second, designated position in pouring furnace is placed the coil in, guarantees axis along the vertical direction, and places leakage in coil
Position is finely adjusted after bucket, making the distance between coil and funnel is 5~10mm, and coil lower edge and funnel runner lower end surface are flat
Together；
Third is cooperated by end face and is combined runner and funnel body, funnel is then being placed on shell cast gate just
Top, and guarantee axis along the vertical direction；
4th, fire door is closed, rear argon-filled protection is vacuumized and carries out foundry alloy melting, while is logical to the coil on the outside of funnel
Electricity, the temperature that heating power is measured by the thermometric galvanic couple applied in funnel upper surface are TiAl alloy melting point to determine, every kind
Specification funnel need to only carry out a thermometric；
5th, after alloy is completely melt in cold crucible, TiAl melt is poured into funnel by cold crucible, cold crucible is disconnected
Electricity；
6th, into the oblique rear wall for being poured into funnel of first strand of melt of funnel, then collect to runner rapidly, passes through
Runner enters casting type chamber with flowing full state straight down；
7th, the coil blackout after TiAl alloy melt is completely into casting type chamber, on the outside of funnel；
8th, after casting is come out of the stove, funnel is taken out, by runner and TiAl scull thereon is sticked to and separates with funnel body, again
The subsequent continuous use of funnel after replacement runner.
The present invention achieves following technical effect compared with the existing technology:
1. using special-shaped funnel between cold-crucible and casting mold, by first strand of TiAl melt of cold crucible casting through leaking
Bucket, to significantly improve the flow stability of TiAl melt, reduces TiAl and closes with flowing full state vertically down into casting type chamber
Golden casting lacks side, cold shut, cavitations, improves the yield rate of TiAl casting.
2. abnormity funnel material used in is high-purity high-strength graphite, can be inductively heated to TiAl melting temperature, thus will not
Cause the reduction of melt temperature.
3. abnormity funnel material used in is high-purity high-strength graphite, and chemical stability is very high under vacuum condition, not molten with TiAl
Precursor reactant, so that the pollution of TiAl melt will not be caused.
4. abnormity funnel structure used in is simple, manufacture is easy, is easy to operate, and main body and runner position are separate structure, leakage
The main body that struggles against is reusable, thus economizes on resources, reduces cost.
5. having great promotional value, melt during other Ti system alloy-steel castings is poured suitable for improving cold-crucible
The stability of flowing lacks side, cold shut, cavitations to reduce casting, improves qualified casting.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram that the present invention improves the stable pouring procedure of TiAl alloy melt flows；
Fig. 2 is the first view stereo structural schematic diagram that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 3 is the second view stereo structural schematic diagram that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 4 is the overlooking structure diagram that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 5 is the left view structural representation that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 6 is the schematic cross-sectional view that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 7 is the schematic view of the front view that the present invention improves the stable funnel of TiAl alloy melt flows；
Fig. 8 is using common funnel and using the TiAl Turbine Casting appearance photo of the funnel casting in the present invention；
Fig. 9 is using common funnel and using the TiAl Turbine Casting x-ray inspection photo of the funnel casting in the present invention.
Description of symbols: 1, antetheca；2, runner；3, rear wall；4, extension；5, crucible；6, TiAl melt；7, coil；
8, casting type chamber.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
As illustrated in figs. 2-7, the present embodiment provides a kind of funnel that improvement TiAl alloy melt flows are stable, the funnels
Including antetheca 1 and rear wall 3, there is an accommodating chamber, the accommodating chamber bottom has between the antetheca 1 and the rear wall 3
One runner 2；The antetheca 1 is a hemispheroidal half, and the rear wall 3 is an arcwall, and the top of the arcwall
It is inclined outwardly.
It is detachably connected between the runner 2 and the accommodating chamber.
The angle being inclined outwardly at the top of the arcwall is 80 °.
The draw ratio of the runner 2 is 3.
2 diameter of runner is 0.4 times of casting sprue diameter.
The funnel uses purity to make for 99% graphite material, bending strength 30MPa.
Coil 7 is provided with outside the funnel, the coil 7 is used for induction heating.
The funnel is additionally provided with outwardly extending extension 4.
The ratio between funnel wall thickness and weight alloy are 0.8-5.0 (mm/kg).
In more specific embodiment, by taking TiAl alloy melt cast diameter 100mm turbine in cold crucible 5 as an example, TiAl
Weight alloy is 3kg, and funnel body weight is 2kg, maximum outside diameter 140mm, height 170mm, intake port 120mm, rear wall 3
Section gradient is 75 °, and 1 radius of antetheca is 80mm, 2 diameter 30mm of runner, 2 length 50mm of runner；Funnel upper surface radially to
External expansion 50mm；Runner 2 and funnel body are separate structure, are combined into one by end face cooperation, mating surface depth 15mm,
Mating surface width 3mm；Funnel material is 99% graphite of purity, and bending strength 30MPa, funnel wall thickness is 10mm；Funnel body
7 diameter of coil in outside is 150mm, is highly 150mm, operating power 80kw.
Embodiment two:
The present embodiment provides a kind of pouring procedures using the funnel, as shown in Figure 1, comprising the following steps:
First, master alloy is placed in cold crucible 5, casting shell molds are placed on designated position in pouring furnace；
Second, coil 7 is placed on designated position in pouring furnace, guarantees axis along the vertical direction, and place in coil 7
Position is finely adjusted after funnel, making the distance between coil 7 and funnel is 8mm, 7 lower edge of coil and 2 lower end surface of funnel runner
Concordantly；
Third is cooperated by end face and is combined runner 2 with funnel body, funnel is then being placed on shell cast gate just
Top, and guarantee axis along the vertical direction；
4th, fire door is closed, rear argon-filled protection is vacuumized and carries out foundry alloy melting, while is logical to the coil 7 on the outside of funnel
Electricity, the temperature that heating power is measured by the thermometric galvanic couple applied in funnel upper surface are TiAl alloy fusing point to determine, every kind
Specification funnel need to only carry out a thermometric；
5th, after alloy is completely melt in cold crucible 5, TiAl melt 6 is poured into funnel by cold crucible 5, cold earthenware
Crucible 5 powers off；
6th, into the oblique rear wall 3 for being poured into funnel of first strand of melt of funnel, then collect to runner 2 rapidly, passes through
Runner 2 is crossed, casting type chamber 8 is entered straight down with flowing full state；
7th, after TiAl alloy melt is completely into casting type chamber 8, the coil 7 on the outside of funnel is powered off；
8th, after casting is come out of the stove, funnel is taken out, by runner 2 and TiAl scull thereon is sticked to and separates with funnel body, again
The subsequent continuous use of funnel after replacement runner 2.
Compared with using common funnel, as shown in figure 8, lacking side and cold shut leaf using the turbine of the funnel casting in the present invention
Piece quantity is reduced to 0 by 2；As shown in figure 9, stomata quantity of the turbo blade position diameter greater than 0.5mm is reduced to 0 by 10
It is a.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (9)
1. a kind of improve the stable funnel of TiAl alloy melt flows, which is characterized in that the funnel includes antetheca and rear wall,
There is an accommodating chamber, the accommodating chamber bottom has a runner between the antetheca and the rear wall；The antetheca is one
Hemispheroidal half, the rear wall is an arcwall, and is inclined outwardly at the top of the arcwall.
2. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the runner
It is detachably connected between the accommodating chamber.
3. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the arc
The angle being inclined outwardly at the top of wall is 70-85 °.
4. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the runner
Draw ratio be 1~5.
5. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the runner
Diameter is 0.3-0.6 times of casting sprue diameter.
6. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the funnel
It is made of graphite material.
7. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the funnel
Outside is provided with coil, and the coil is used for induction heating.
8. according to claim 1 improve the stable funnel of TiAl alloy melt flows, which is characterized in that the funnel
Top is additionally provided with outwardly extending extension.
9. a kind of pouring procedure using funnel described in claim 1-8, which comprises the following steps:
First, master alloy is placed in cold crucible, casting shell molds are placed on designated position in pouring furnace；
Second, designated position in pouring furnace is placed the coil in, guarantees axis along the vertical direction, and in coil after placement funnel
Position is finely adjusted, making the distance between coil and funnel is 5~10mm, and coil lower edge is concordant with funnel runner lower end surface；
Third is cooperated by end face and is combined runner and funnel body, and then funnel is placed on right above shell cast gate,
And guarantee axis along the vertical direction；
4th, fire door is closed, rear argon-filled protection is vacuumized and carries out foundry alloy melting, while being powered to the coil on the outside of funnel, add
The temperature that thermal power is measured by the thermometric galvanic couple applied in funnel upper surface is TiAl alloy fusing point to determine, every kind of specification leakage
Bucket need to only carry out a thermometric；
5th, after alloy is completely melt in cold crucible, TiAl melt is poured into funnel by cold crucible, cold crucible power-off；
6th, into the oblique rear wall for being poured into funnel of first strand of melt of funnel, then collect to runner rapidly, through overcurrent
Road enters casting type chamber with flowing full state straight down；
7th, the coil blackout after TiAl alloy melt is completely into casting type chamber, on the outside of funnel；
8th, after casting is come out of the stove, funnel is taken out, by runner and TiAl scull thereon is sticked to and separates with funnel body, re-replace
The subsequent continuous use of funnel after runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159428.3A CN109732044A (en) | 2019-03-04 | 2019-03-04 | It is a kind of to improve TiAl alloy melt flows stable funnel and pouring procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159428.3A CN109732044A (en) | 2019-03-04 | 2019-03-04 | It is a kind of to improve TiAl alloy melt flows stable funnel and pouring procedure |
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| Publication Number | Publication Date |
|---|---|
| CN109732044A true CN109732044A (en) | 2019-05-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910159428.3A Pending CN109732044A (en) | 2019-03-04 | 2019-03-04 | It is a kind of to improve TiAl alloy melt flows stable funnel and pouring procedure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957911A (en) * | 2020-08-21 | 2020-11-20 | 浙江英洛华磁业有限公司 | Heat preservation power adjusting method during neodymium iron boron smelting and casting |
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Application publication date: 20190510 |