CN109550898A - Titanium-aluminium alloy investment casting method - Google Patents
Titanium-aluminium alloy investment casting method Download PDFInfo
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- CN109550898A CN109550898A CN201811420745.8A CN201811420745A CN109550898A CN 109550898 A CN109550898 A CN 109550898A CN 201811420745 A CN201811420745 A CN 201811420745A CN 109550898 A CN109550898 A CN 109550898A
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- casting
- formwork
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- aluminium alloy
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of titanium-aluminium alloy investment casting method, the present invention includes the new technique content such as gradient type cooling after formwork on-line heating, casting.The method of the present invention facilitates thin-walled TiAl alloy casting forming, reduces shrinkage porosity defect of contraction cavity, and cold cracking will not occur in process of setting for casting, is the important precision casting process method of the following high-end casting.
Description
Technical field
The present invention relates to a kind of titanium-aluminium alloy investment casting methods.
Background technique
In recent years, aerospace flight vehicle proposes more requirements to structural member, such as it is higher using temperature, it is lighter
The demand of quality, improved key factor are the promotions of structural material high-temperature behavior, and advanced high-temperature structural material is each by the world
State, which is classified as, gives priority to object, and the development of high temperature structural material is extremely urgent.TiAl alloy is resistance to as a kind of novel light
High-temperature structural material has a unique performance advantage at many aspects, such as lower density, higher specific strength and specific modulus,
Good antioxygenic property and croop property and excellent fatigue behaviour are the necks such as contemporary aerospace industry, civilian industry
The candidate high-temperature structural material in domain has important engineering application potential quality, causes the highest attention of researcher.
Since TiAl alloy temperature-room type plasticity is low, causes to be machined high cost and yield rate is low.So near-net-shape
Processing technology is the key that solve this problem.Melted module precise casting technology has near-net-shape, and can produce surface matter
Excellent thin-section casting is measured, the casting produced only needs seldom or do not need to be machined, and production cost is low, is that production TiAl is closed
One prefered method of golden casting.Full form casting process has unique process advantage, is developed rapidly in China.The work
Technical difficulty with higher, the model casting in China are still faced in development greatly without strong problem, in synthesis skill simultaneously
Technical level, specialized mating, field management etc. need to further increase.
Traditional formwork is transferred to smelting and pouring equipment by the way of preheating after being preheated outside smelting and pouring equipment
In, it is then vacuumized, TiAl alloy carries out smelting and pouring, this process needs 20-40 minutes or more, and there are the following problems:
1. mould shell temperature casting declines, the temperature of formwork when being unable to control TiAl alloy casting；2. the mould of TiAl alloy pouring metal melt
In shell, cooling velocity is unable to control in metal solidification process, and cold cracking occurs for casting.
The mobility of TiAl alloy compared with A1 alloy difference, casting when be easy to produce misrun, cold shut the defects of.Alloy is solidifying
Gu shrinkage is larger, casting is also easy to produce shrinkage porosity defect of contraction cavity.TiAl alloy temperature-room type plasticity is low, and casting is easy to produce in process of setting
Raw food is split.
Summary of the invention
The purpose of the present invention is to provide a kind of titanium-aluminium alloy investment casting methods.
To solve the above problems, the present invention provides a kind of titanium-aluminium alloy investment casting method, comprising:
Carry out formwork preparation；
The formwork is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil；
The formwork is heated and kept the temperature；
It uses induction heating and the mode of electric arc consumable to melt as liquid TiAl alloy, is injected into copper crucible；
Row when TiAl alloy liquid in copper crucible is cooled down；
After being cooled to preset temperature or less, furnace cooling preset time；
The formwork is transferred to outside the smelting and pouring equipment, is cleared up, casting is taken out.
Further, in the above-mentioned methods, the formwork is heated and is kept the temperature, comprising:
The formwork is heated to 1200~1500 DEG C, keeps the temperature 30-50 minutes.
Further, in the above-mentioned methods, row when the TiAl alloy liquid in copper crucible is cooled down, comprising:
By the TiAl alloy liquid castable in copper crucible, into heating, the mode of 50-150 DEG C/h cools down.
Further, in the above-mentioned methods, after being cooled to preset temperature or less, furnace cooling preset time, comprising:
After being cooled to 80-100 DEG C or less, furnace cooling 3-5h.
Compared with prior art, the present invention includes the new technique content such as gradient type cooling after formwork on-line heating, casting.
The method of the present invention facilitates thin-walled TiAl alloy casting forming, reduces shrinkage porosity defect of contraction cavity, and casting will not be sent out in process of setting
Raw food is split, and is the important precision casting process method of the following high-end casting.
Detailed description of the invention
Fig. 1 is the schematic diagram of the titanium-aluminium alloy investment casting method of one embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, the present invention provides a kind of titanium-aluminium alloy investment casting method, comprising:
Step S1 carries out formwork 1 and prepares；
The formwork 1 is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil 2 by step S2；
The formwork 1 is heated and is kept the temperature by step S3；
Here, the formwork is heated to 1200~1500 DEG C, 30-50 minutes are kept the temperature；
Step S4, by TiAl alloy use induction heating and consutrode 4 carry out electric arc consumable by way of melt for
Liquid is injected into copper crucible 3；
Step S5 cools down row when TiAl alloy liquid in copper crucible；
Here, into heating, the mode of 50-150 DEG C/h cools down by the TiAl alloy liquid castable in copper crucible；
Step S6, after being cooled to preset temperature or less, furnace cooling preset time；
Here, after being cooled to 80-100 DEG C or less, furnace cooling 3-5h.
The formwork is transferred to outside the smelting and pouring equipment, is cleared up by step S7, takes out casting.
Here, the present invention includes the new technique content such as gradient type cooling after formwork on-line heating, casting.The method of the present invention
Facilitate thin-walled TiAl alloy casting forming, reduces shrinkage porosity defect of contraction cavity, it is not that cold cracking will not occur in process of setting for casting
Carry out the important precision casting process method of high-end casting.
Embodiment 1
By taking certain equips shell casting as an example, material Ti-45Al-8Nb, size Φ 220mm at maximum outer circle, height
300mm, most thin position are 3mm, and this method comprises the following steps that
S1, formwork preparation；
S2, formwork is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil；
S3, formwork is heated to 1500 DEG C, keeps the temperature 35 minutes；
S4, it uses the mode of electric arc consumable to melt as liquid TiAl alloy, is injected into copper crucible；
S5, will the TiAl alloy liquid castable in copper crucible to heating in formwork in；
After S6, casting complete, formwork keeps the temperature 10 minutes, is then cooled down by the way of 50 DEG C/h.
S7, after being cooled to 80 DEG C or less, furnace cooling 5h.
S8, formwork is transferred to outside smelting and pouring equipment, is cleared up, take out casting.
After casting cleaning as shown in the figure, casting realizes monolithic molding, no cold shut defect.By X-ray non-destructive testing, casting
Inside is without shrinkage porosity defect of contraction cavity, flawless defect.
Embodiment 2
With warhead cabin shell, material Ti-45Al-5Nb, diameter of phi 340mm, height 480mm, inner surface requires to be not added
Work, the casting are whole cylindrical structure, and this method comprises the following steps that
S1, formwork preparation；
S2, formwork is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil；
S3, formwork is heated to 1300 DEG C, keeps the temperature 35 minutes；
S4, it uses the mode of electric arc consumable to melt as liquid TiAl alloy, is injected into copper crucible；
S5, will the TiAl alloy liquid castable in copper crucible to heating in formwork in；
After S6, casting complete, formwork keeps the temperature 15 minutes, is then cooled down by the way of 80 DEG C/h.
S7, after being cooled to 80 DEG C or less, furnace cooling 5h.
S8, formwork is transferred to outside smelting and pouring equipment, is cleared up, take out casting.
After casting cleaning as shown in the figure, casting realizes monolithic molding, no cold shut defect.By X-ray non-destructive testing, casting
Inside is without shrinkage porosity defect of contraction cavity, flawless defect.
Embodiment 3
Shell casting size Ф 470mm × 440mm, material Ti-48Al, CT6 grades of dimension precision requirement, average wall thickness
3mm, this method comprises the following steps that
S1, formwork preparation；
S2, formwork is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil；
S3, formwork is heated to 1200 DEG C, keeps the temperature 30 minutes；
S4, it uses the mode of Medium frequency induction to melt as liquid TiAl alloy, is injected into copper crucible；
S5, will the TiAl alloy liquid castable in copper crucible to heating in formwork in；
After S6, casting complete, formwork keeps the temperature 20 minutes, is then cooled down by the way of 100 DEG C/h.
S7, after being cooled to 80 DEG C or less, furnace cooling 3h.
S8, formwork is transferred to outside smelting and pouring equipment, is cleared up, take out casting.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, when TiAl alloy is poured, mould shell temperature can be controlled by heating system at 1200~1500 DEG C, solved because closing
Poor fluidity the defects of leading to the problem of misrun, cold shut of gold, it can be achieved that wall thickness 3mm thin-wall part molding；
2, after TiAl alloy casting complete, mould shell temperature can carry out gradient type cooling by heating system, can effectively solve
Certainly alloy graining shrinkage is larger, and casting leads to the problem of shrinkage porosity defect of contraction cavity.And because TiAl alloy temperature-room type plasticity is low, casting
Cold cracking is led to the problem of in process of setting.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention
And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it
Interior, then the invention is also intended to include including these modification and variations.
Claims (4)
1. a kind of titanium-aluminium alloy investment casting method characterized by comprising
Carry out formwork preparation；
The formwork is transferred in smelting and pouring equipment, is placed in mid-frequency induction heating coil；
The formwork is heated and kept the temperature；
It uses induction heating and the mode of electric arc consumable to melt as liquid TiAl alloy, is injected into copper crucible；
Row when TiAl alloy liquid in copper crucible is cooled down；
After being cooled to preset temperature or less, furnace cooling preset time；
The formwork is transferred to outside the smelting and pouring equipment, is cleared up, casting is taken out.
2. titanium-aluminium alloy investment casting method as described in claim 1, which is characterized in that the formwork is heated and kept the temperature,
Include:
The formwork is heated to 1200~1500 DEG C, keeps the temperature 30-50 minutes.
3. titanium-aluminium alloy investment casting method as described in claim 1, which is characterized in that by the TiAl alloy liquid in copper crucible
Row cools down when body, comprising:
By the TiAl alloy liquid castable in copper crucible, into heating, the mode of 50-150 DEG C/h cools down.
4. titanium-aluminium alloy investment casting method as described in claim 1, which is characterized in that after being cooled to preset temperature or less,
Furnace cooling preset time, comprising:
After being cooled to 80-100 DEG C or less, furnace cooling 3-5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420745.8A CN109550898A (en) | 2018-11-27 | 2018-11-27 | Titanium-aluminium alloy investment casting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811420745.8A CN109550898A (en) | 2018-11-27 | 2018-11-27 | Titanium-aluminium alloy investment casting method |
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| CN109550898A true CN109550898A (en) | 2019-04-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021106007A1 (en) * | 2019-11-28 | 2021-06-03 | Yashkumar Singh | Process for manufacturing of copper-titanium alloys by lost wax process (investment casting) |
| CN114700466A (en) * | 2022-04-18 | 2022-07-05 | 北京钢研高纳科技股份有限公司 | Synchronous heating casting method of alloy casting and alloy casting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1541786A (en) * | 2003-05-01 | 2004-11-03 | 中国科学院金属研究所 | A preparation method for investment casting γ-TiAl-based alloy mold shell |
| CN101462151A (en) * | 2009-01-16 | 2009-06-24 | 哈尔滨工业大学 | Method for preparing TiAl-based alloy formwork by precision-investment casting |
| CN105499499A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司北京航空材料研究院 | Precise forming method for titanium-aluminum intermetallic compounds |
| CN205702317U (en) * | 2016-04-06 | 2016-11-23 | 中国航空工业集团公司北京航空材料研究院 | Preheating device in a kind of fired mold precision casting type shell stove |
| CN106984795A (en) * | 2017-03-23 | 2017-07-28 | 西北工业大学 | A kind of Ti55 casts the temperature control clotting method of high-temperature titanium alloy |
-
2018
- 2018-11-27 CN CN201811420745.8A patent/CN109550898A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1541786A (en) * | 2003-05-01 | 2004-11-03 | 中国科学院金属研究所 | A preparation method for investment casting γ-TiAl-based alloy mold shell |
| CN101462151A (en) * | 2009-01-16 | 2009-06-24 | 哈尔滨工业大学 | Method for preparing TiAl-based alloy formwork by precision-investment casting |
| CN105499499A (en) * | 2015-12-08 | 2016-04-20 | 中国航空工业集团公司北京航空材料研究院 | Precise forming method for titanium-aluminum intermetallic compounds |
| CN205702317U (en) * | 2016-04-06 | 2016-11-23 | 中国航空工业集团公司北京航空材料研究院 | Preheating device in a kind of fired mold precision casting type shell stove |
| CN106984795A (en) * | 2017-03-23 | 2017-07-28 | 西北工业大学 | A kind of Ti55 casts the temperature control clotting method of high-temperature titanium alloy |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021106007A1 (en) * | 2019-11-28 | 2021-06-03 | Yashkumar Singh | Process for manufacturing of copper-titanium alloys by lost wax process (investment casting) |
| CN114700466A (en) * | 2022-04-18 | 2022-07-05 | 北京钢研高纳科技股份有限公司 | Synchronous heating casting method of alloy casting and alloy casting |
| CN114700466B (en) * | 2022-04-18 | 2024-01-26 | 北京钢研高纳科技股份有限公司 | Synchronous heating casting method of alloy casting and alloy casting |
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Application publication date: 20190402 |