CN1101284C - Integrated crucible and mold for low cost 'gamma'-tial castings - Google Patents
Integrated crucible and mold for low cost 'gamma'-tial castings Download PDFInfo
- Publication number
- CN1101284C CN1101284C CN98802006.8A CN98802006A CN1101284C CN 1101284 C CN1101284 C CN 1101284C CN 98802006 A CN98802006 A CN 98802006A CN 1101284 C CN1101284 C CN 1101284C
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- model
- defined method
- crucible
- sleeve
- casting
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Golf Clubs (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Mold Materials And Core Materials (AREA)
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Abstract
The present invention relates to an integral crucible for casting of reactive metals, which is formed by combining a graphite sleeve and an investment pattern connected thereon, a laminate of alternating layers of facecoat slurry and ceramic stucco are applied to the outside of the pattern to form an investment shell. The layers of the laminate extend over a mating portion of the sleeve. After the shell is calcinated, the investment pattern is vaporized to leave the sleeve and shell, that is an integral crucible.
Description
The cross reference of related application
The application admits that the provisional application 60/036041 on January 27th, 1997 is entitled as being benefited of date of application of monoblock type crucible that low-cost casting γ-TiAl uses and casting mold.
Background of invention
Invention field
Crucible is used in relate generally to of the present invention casting, more particularly, the invention provides out a kind of crucible and invested mould of modular monolithic devices, to be used for casting the reactive metal of reactive metal, particularly complicated shape.
Description of Related Art
Dissolving and casting of reactive metal such as titanium or titanium aluminide is very difficult, and this is because this motlten metal can react with the crucible that contains aluminium oxide, zircon or silicate; When casting, all use this crucible usually such as metals such as iron, nickel or aluminium.Turbocharger rotor is normally cast with the nickel high temperature alloy, and the invested mould that this alloy utilization has the zircon face coat just can dissolve and cast easily with the aluminium oxide-silicate crucible that is attached to the casting mold top., the titanium aluminide of fusion can promptly react with aluminium oxide-silicate crucible and casting can not be carried out.
Alternative crucible material comprises yittrium oxide (Y
2O
3), thorium oxide (ThO
2), the oxide of calcium oxide (CaO) and other unusual rare earth element.Thorium oxide is radioactive, and the very little shortcoming of thermal-shock resistance is arranged.Therefore it does not obtain the commercial development utilization as yet.But the price of yittrium oxide crucible is very expensive, 50 to 100 dollars.And the price of aluminium oxide-silicate crucible that is used to cast the nickel high temperature alloy is less than 1 dollar.Because titanium and titanium aluminide are cast in many-sided application and can be at war with the nickel casting, therefore, the high price of yittrium oxide crucible loses market with regard to making the casting of titanium and titanium aluminide because of price is too high.It is particular importance that this application to Price Sensitive is used as automobile.
Calcium oxide is because its Heat stability is good also is a kind of potential refractory material concerning titanium and titanium aluminide.Disclose in people's such as Degawa the U.S. Patent No. 4,710,481 and in lime crucible, dissolved titanium and titanium alloy.But calcium oxide has the hydrophily of height, and can spontaneously play aquation under the atmospheric humidity level of environment.Thereby aquation can be accompanied by volume-variation and cause and break and peel off.Lime crucible will spontaneously break being exposed under the atmospheric humidity 1 hour.Therefore, calcium oxide is unpractical as crucible material under the commercial and industrial environment.
This shows, need provide a kind of can overcome above-mentioned shortcoming at the cast titanium of industrial reality and the low price casting mold of titanium aluminide metal.The present invention also might be used for the casting of other reactive metal such as zircaloy.Also need to provide cheaply for casting reactive and non-reacted metal, at industrial realization, modular crucible and invested mould.
Also need to provide a kind of graphite in addition or other is to responding to responsive composite material crucible pot, it contains graphite, this graphite is attached directly on the invested mould, in order to do the casting of γ-TiAl parts, particularly need to provide the method for a kind of low-cost model casting γ-TiAl turbocharger rotor.
Summary of the invention
For limitation that overcomes prior art and the quality that obtains requirement, the invention provides out a kind of graphite crucible, it is attached directly to the top of the invested mould of foundry goods complex contour, constitute the unit of an integral body, the specific embodiments of intricate casting disclosed herein is a turbocharger rotor.The present invention also provides a kind of method of making monoblock type crucible and casting mold, it is characterized in that, the step of this method has: adhere to a fusible model on cylindrical graphite crucible, and produce a plycast around the coupling part of this model and crucible.This shell mould is model and crucible coupling part are immersed in the ceramic thin pulp of using as face coat of inertia and to be formed, dry and/or the curing with this dip-coating coating layer portion ground of relief, on the dip-coating coating, add again and be coated with one deck pottery plaster, and stacked other dip-coating layer and grey mud layer, to obtain the shell mould of required thickness.
Embodiment of the present invention of describing in detail later will provide a kind of modular crucible/casting mold system, and it is applicable in a vacuum and surpasses cast metal parts under 1400 ℃ the condition in temperature.
Using this method of device of casting complex component of the present invention, is to utilize the fast instantizing of γ-TiAl and casting to avoid being infected with carbon from crucible.Carbon is the contaminant of known γ-TiAl.Be infected with on a small quantity, promptly be lower than under the level of 2000ppm (weight %), often the introducing of carbon can improve the creeping property of γ-TiAl.But when the amount of being infected with was big, carbon can the strong stretching ductility that reduces γ-TiAl.Modular graphite crucible/invested mould can prevent that γ-TiAl is infected with by the harmful of crucible, is that it is minimum that the potential possibility that these two factors can make carbon be infected with reaches because this design can guarantee fusing time fast and low overheated.
The accompanying drawing summary
Details of the present invention and characteristic will more clearly be understood in detailed description and after consulting accompanying drawing, and accompanying drawing has:
Fig. 1 is the vertical cross section of monoblock type graphite crucible and invested mould; And
Fig. 2 utilizes method of the present invention to make the perspective view of exemplary turbocharger rotor with γ-TiAl.
Detailed Description Of The Invention
A kind of embodiment of the present invention as shown in Figure 1.Monoblock type crucible and casting mold include a cylindrical graphite sleeve 10, and its bottom 12 is the coupling parts that are used for admitting the fusible model 14 of polystyrene, and the runner 15 of binding is arranged on the fusible model 14.In the illustrated embodiment, linking runner seals attached on the sleeve with wax 16.Sleeve be dimensioned to the melt base 17 that holds requested number.Plycast 18 is to form by means of laminate surface coating thin pulp 20 and ceramic plaster 22 (for the part of section only is shown for the purpose of clear), and this shell mould extends to and is bonded on the coupling part, bottom of graphite sleeve.After roasting, model promptly gasifies, and the shell mould sandwich of hardening promptly is cemented on the graphite hollow cylinder, constitutes monoblock type crucible and casting mold that the required parts of casting are used.Hole 24 on the sleeve bottom surface provides a passage that enters shell mould for the casting of fusion with metal, and flange 26 then is retained in the melt base in the crucible on the position of eddy-current heating.
The step of making and using the method for device of the present invention to comprise has: by means of the recess that immerses the top of polystyrene turbocharger rotor model in the hot wax and be inserted into the graphite cannula tube bottom polystyrene model is attached on the cylindrical graphite sleeve.Constitute plycast around polystyrene model and lower cartridge subsequently.The concrete scheme that lift in this place is, the manufacture method of invested mould is to immerse from the model with wax or plastic shape such as required foundry goods that to use γ-TiAl be to begin the face coat thin pulp of any pottery (as yittrium oxide or calcium oxide) preparation of inertia.A kind of suitable thin pulp that forms the calcium oxide face coat has been 08/644 in series number, open in 598 the co-pending patent application, this patent application is entitled as " the inertia calcium oxide face coat that the casting of fusible pattern system and titanium-aluminide alloys are used ", transferred the same assignee with the present invention, the full text of this patent application is introduced in this mode with list of references.
The dip-coating coating by part dry and/or solidify after, alternately add again at model and crucible lower area and to be coated with ceramic plaster and dip-coating layer, up to the shell mould that forms desired thickness.This crucible/invested mould gets final product finish-drying subsequently, then under near 1000 ℃ temperature in oxidizing atmosphere such as air roasting be no less than 0.5 hour.The result of roasting is being gasified totally of model, and its situation is familiar with the technical staff in " lost-wax casting " field.
After this, while hot crucible/invested mould assembly is transferred to from stove between casting in and vacuumize.With the melt base insertion crucible of a columniform casting with metal.Subsequently by means of graphite crucible is carried out eddy-current heating and metal is melted rapidly.Because graphite is very strong receptor, so crucible is heated to the fusion temperature of γ-TiAl soon.Melt metal is done to flow directly in the casting mold that is being connected with the holdup time in order to the degree of superheat of minimum by means of gravity.Short and the degree of superheat of holdup time is hanged down and can be prevented obviously being infected with from the carbon of crucible.Because the blocking of crucible/invested mould design makes that the drippage distance is very short, this has guaranteed that tiny section can fill with.Long drippage distance (be divided in crucible/invested mould system under two the situation and will do like this) can make cast discontented because of the cooling and the premature setting of perfusion conduit region.After cooling, the metal of cast has become original mould shapes, can take out from formwork.
Embodiment 1
Turbocharger rotor model of making of polystyrene plastics is fitted into the recess of graphite crucible bottom with wax, so that model and crucible couple together.These plastics are dipped in the face coat thin pulp of preparing with yittrium oxide, and the yttria surfaces coating is an inertia to γ-TiAl.When this dip-coating coating by part dry and/or solidify after, just alternately add and be coated with ceramic plaster and dip-coating coating, up to the shell mould of formation desired thickness at the lower area of model and graphite crucible.Repeatedly done dip-coating more subsequently, to form the invested mould of integral body as shown in Figure 1 with the supporting coating of flint grain and aluminium oxide-silicate powder preparation.This crucible/invested mould that includes plastics turbocharger model by finish-drying after, in air under near 1000 ℃ temperature by roasting 0.5 hour.Then, this graphite crucible/turbocharger invested mould assembly is shifted out from stove while hot, adds with the melt base of metal with casting, places under the quartz bell cover and vacuumizes.The sensed heating of graphite crucible and metal subsequently and make metal molten.With the figure of the TiAl of this manufactured casting rotor as shown in Figure 2.
Below by the requirement of Patent Law the present invention has been done detailed description, those skilled in the art will admit, specific embodiments disclosed herein can have multiple modification and replacement, and these modification and replacement all comprise within defined scope of the present invention of following claim and the intention.
Claims (10)
1. make the casting monoblock type crucible used of reactive metal and the method for casting mold for one kind, it comprises the following steps:
Fusible model is attached on the cylindrical graphite sleeve;
Coupling part around model and sleeve forms a plycast;
With shell mould and accompanying sleeve roasting, make it to solidify fully, and make the model gasification.
2. the defined method of claim 1, the step that wherein fusible model is attached to sleeve comprises:
The coupling part of model is immersed in the hot wax; And
The coupling part of model is inserted the recess of graphite sleeve.
3. the defined method of claim 1, the step that wherein forms plycast comprises:
Model is immersed in the face coat thin pulp;
Make the dry or curing in dip-coating coating layer portion ground;
Alternately add in the coupling part of model and sleeve and to be coated with ceramic plaster and dip-coating layer, up to the shell mould that forms desired thickness.
4. the defined method of claim 3 wherein after adding the step that is coated with alternating layer, makes the shell mould finish-drying with that.
5. the defined method of claim 1, model polystyrene plastics system wherein.
6. the defined method of claim 1, wherein roasting is at oxidizing atmosphere for example in the air, be no less than 0.5 hour under near 1000 ℃ of temperature.
7. the defined method of claim 3 wherein after adding the step that is coated with alternating layer, is to add to be coated with the coating of one deck flint grain and aluminium oxide-silicate powder at least with that.
8. the defined method of claim 3, wherein the face coat thin pulp forms inactive ceramic.
9. the defined method of claim 8 wherein contains yittrium oxide in the inactive ceramic.
10. the defined method of claim 8 wherein contains calcium oxide in the inactive ceramic.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3604197P | 1997-01-27 | 1997-01-27 | |
| US60/036,041 | 1997-01-27 | ||
| US814398A | 1998-01-16 | 1998-01-16 | |
| US09/008,143 | 1998-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1244147A CN1244147A (en) | 2000-02-09 |
| CN1101284C true CN1101284C (en) | 2003-02-12 |
Family
ID=26677855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98802006.8A Expired - Fee Related CN1101284C (en) | 1997-01-27 | 1998-01-27 | Integrated crucible and mold for low cost 'gamma'-tial castings |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0963262B1 (en) |
| JP (1) | JP2001509083A (en) |
| CN (1) | CN1101284C (en) |
| AT (1) | ATE216929T1 (en) |
| BR (1) | BR9807084A (en) |
| DE (1) | DE69805164T2 (en) |
| ES (1) | ES2176986T3 (en) |
| PT (1) | PT963262E (en) |
| WO (1) | WO1998032557A1 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749006B1 (en) * | 2000-10-16 | 2004-06-15 | Howmet Research Corporation | Method of making investment casting molds |
| US6663347B2 (en) * | 2001-06-06 | 2003-12-16 | Borgwarner, Inc. | Cast titanium compressor wheel |
| DE10209346B4 (en) | 2002-03-02 | 2004-02-19 | Daimlerchrysler Ag | Manufacturing method for a multi-part valve for internal combustion engines |
| PT103018A (en) * | 2003-09-12 | 2005-03-31 | Univ Do Minho | PROCESS FOR OBTAINING FISH IN G-TIAI BY FOUNDATION |
| FR2870148B1 (en) * | 2004-05-12 | 2006-07-07 | Snecma Moteurs Sa | LOST WAX FOUNDRY PROCESS WITH CONTACT LAYER |
| FR2870147B1 (en) * | 2004-05-12 | 2007-09-14 | Snecma Moteurs Sa | LOST WAX FOUNDRY PROCESS |
| US7258158B2 (en) | 2004-07-28 | 2007-08-21 | Howmet Corporation | Increasing stability of silica-bearing material |
| US8048365B2 (en) * | 2007-04-30 | 2011-11-01 | General Electric Company | Crucibles for melting titanium alloys |
| DE102009018801A1 (en) | 2009-04-24 | 2009-11-05 | Daimler Ag | Turbocharger arrangement has turbocharger shaft and turbocharger wheel, where turbocharger shaft with turbocharger wheel is made in single piece from material from group comprising metal matrix and ceramic matrix composites |
| CN101875106B (en) * | 2009-11-20 | 2011-12-28 | 北京科技大学 | Preparation method of directional solidification high-niobium TiAl-base alloy |
| CN101984321B (en) * | 2010-11-23 | 2012-05-23 | 北京科技大学 | Method for fabricating crucible pattern die for directional solidification of titanium aluminum alloy |
| US8858697B2 (en) | 2011-10-28 | 2014-10-14 | General Electric Company | Mold compositions |
| CN102527936B (en) * | 2012-01-19 | 2013-04-10 | 沈阳铸造研究所 | Graphite mould casting method for precise forming of low expansion alloy |
| US9011205B2 (en) | 2012-02-15 | 2015-04-21 | General Electric Company | Titanium aluminide article with improved surface finish |
| US8932518B2 (en) | 2012-02-29 | 2015-01-13 | General Electric Company | Mold and facecoat compositions |
| US8906292B2 (en) | 2012-07-27 | 2014-12-09 | General Electric Company | Crucible and facecoat compositions |
| US8708033B2 (en) | 2012-08-29 | 2014-04-29 | General Electric Company | Calcium titanate containing mold compositions and methods for casting titanium and titanium aluminide alloys |
| US8992824B2 (en) | 2012-12-04 | 2015-03-31 | General Electric Company | Crucible and extrinsic facecoat compositions |
| US9592548B2 (en) | 2013-01-29 | 2017-03-14 | General Electric Company | Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9192983B2 (en) | 2013-11-26 | 2015-11-24 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9511417B2 (en) | 2013-11-26 | 2016-12-06 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US10391547B2 (en) | 2014-06-04 | 2019-08-27 | General Electric Company | Casting mold of grading with silicon carbide |
| DE102018109322A1 (en) * | 2018-04-19 | 2019-10-24 | Engel Austria Gmbh | Melting unit for a molding machine and molding machine |
| CN112108641A (en) * | 2019-06-19 | 2020-12-22 | 中冶宝钢技术服务有限公司 | Mold core positioning method for integral pouring of tundish refractory lining |
| CN118513509A (en) * | 2024-07-23 | 2024-08-20 | 洛阳双瑞精铸钛业有限公司 | Titanium and titanium alloy watchcase casting and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01157759A (en) * | 1987-07-25 | 1989-06-21 | Asahi Roentgen Kogyo Kk | Method and device for precisely casting titanium or titanium alloy |
-
1998
- 1998-01-27 CN CN98802006.8A patent/CN1101284C/en not_active Expired - Fee Related
- 1998-01-27 WO PCT/US1998/001672 patent/WO1998032557A1/en active IP Right Grant
- 1998-01-27 BR BR9807084-3A patent/BR9807084A/en not_active IP Right Cessation
- 1998-01-27 AT AT98911363T patent/ATE216929T1/en not_active IP Right Cessation
- 1998-01-27 EP EP98911363A patent/EP0963262B1/en not_active Expired - Lifetime
- 1998-01-27 ES ES98911363T patent/ES2176986T3/en not_active Expired - Lifetime
- 1998-01-27 JP JP53225898A patent/JP2001509083A/en not_active Ceased
- 1998-01-27 PT PT98911363T patent/PT963262E/en unknown
- 1998-01-27 DE DE69805164T patent/DE69805164T2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR9807084A (en) | 2000-04-18 |
| PT963262E (en) | 2002-09-30 |
| DE69805164T2 (en) | 2002-10-31 |
| DE69805164D1 (en) | 2002-06-06 |
| ES2176986T3 (en) | 2002-12-01 |
| JP2001509083A (en) | 2001-07-10 |
| EP0963262A1 (en) | 1999-12-15 |
| ATE216929T1 (en) | 2002-05-15 |
| EP0963262B1 (en) | 2002-05-02 |
| WO1998032557A1 (en) | 1998-07-30 |
| CN1244147A (en) | 2000-02-09 |
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| C14 | Grant of patent or utility model | ||
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