CN1323784C - Integral turbine orientated crystallization method - Google Patents
Integral turbine orientated crystallization method Download PDFInfo
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- CN1323784C CN1323784C CNB2005100389241A CN200510038924A CN1323784C CN 1323784 C CN1323784 C CN 1323784C CN B2005100389241 A CNB2005100389241 A CN B2005100389241A CN 200510038924 A CN200510038924 A CN 200510038924A CN 1323784 C CN1323784 C CN 1323784C
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Abstract
The present invention discloses an integral turbine orientated crystallization method which relates to the casting technique, particularly to an integral turbine casting method. According to the design scheme provided by the present invention, the integral turbine orientated crystallization method comprises that: a. casing packing: 1 to 10mm of heat-insulating material is coated at a big end plane of a turbine mould casing; b. box packing and sand filling: the turbine mould casing is installed in a sand box, quartz sand is filled in the sand box, and the inner bottom surface of the sand box and the top surface of the sand body are isolated by an insulating plate; c. calcination: when directional crystallization is carried out, calcination temperature needs raising, and the calcination temperature is 850 to 1300 DEG C; d. smelting: nickel base alloy is smelted in an equiaxial vacuum casting induction melting furnace, and is poured in the temperature of 1450 DEG C to 1700 DEG C; e. cooling down: after the pouring, the nickel base alloy is arranged for 2 to 30 minutes in a vacuum state, and the turbine is poured by adopting the complete set of technological method, so that a center position of the turbine is slowly cooled down, and temperature gradient is formed from the center part of the turbine to an exterior margin. In a cooling process, solidification is orderly carried out from the exterior margin to the center part, and radial oriented columnar crystal is formed at a key region of the turbine impeller.
Description
Technical field
The present invention relates to foundry engieering, specifically a kind of casting method of integral turbine.
Technical background
Turbine is a requisite vital part in the contemporary diesel engine supercharging technology, its turbine of high-performance booster is rotation at a high speed under 650 ℃-700 ℃ hot environment, rotating speed reaches 150000-170000 rev/min, even surpassing 200000 rev/mins, the blade of 0.5-1.5 millimeter will stand lasting high temperature gas flow and impact and drawing by high temperature.Therefore turbo blade must possess enough elevated temperature strengths, except adopting the high performance alloys material, realizes that in the turbine metallographic structure crystallographic orientation is the important measures that improve the turbo blade elevated temperature strength.Domestic still blank on the crystallographic orientation of integral turbine, general naked shell or the involucrum roasting direct not of adopting poured into a mould under 1400～1450 ℃ pouring temperature, direct air cooling in atmosphere after the cast, cause key area crystal grain in small, broken bits, turbine flies to split probability when the high temperature and high speed long-play big.Concrete crystal grain situation is seen shown in Figure 4, and as seen from the figure, the crystal grain on the blade is in small, broken bits, and average A＞1 of the crystal boundary of blade does not reach requirement.
Summary of the invention
The objective of the invention is to seek a kind of orientated crystallization method of integral turbine, adopt a whole set of process cast turbine, the turbine centre is slowly cooled off, from turbine core portion to outer rim formation temperature gradient, in cooling procedure from outer rim to the center consecutive solidification, form radial directed column crystal at the key area of turbo blade.
According to design provided by the present invention, the integral turbine orientated crystallization method is: a, involucrum: the insulation material of wrapping 1～10mm at the big transverse plane of turbine formwork; B, vanning back-up sand: with the turbine formwork sandbox of packing into, and fill out with quartz sand deposited, sandbox inner bottom surface and sandbox end face thermal insulation board; C, roasting: need improve sintering temperature when doing crystallographic orientation, sintering temperature is 850～1300 ℃; D, melting: nickel-base alloy is poured into a mould when 1450 ℃～1700 ℃ temperature waiting melting of axle vacuum pressing and casting induction melting furnace; 5, cooling: after the cast, under vacuum state, placed 2～30 minutes, adopt above-mentioned a whole set of process cast turbine, the turbine centre is slowly cooled off, from turbine core portion to outer rim formation temperature gradient, in cooling procedure from outer rim to the center consecutive solidification, form radial directed column crystal at the key area of turbo blade.
After adopting the present invention, the crystal grain of turbo blade has reached following requirement: the grainiess that is positioned at each blade-side wing surface zone (each blade surface suction side) is added up, each crystal boundary counting is 1, this average A of crystal boundary that distinguishes all blades is smaller or equal to 1, and is the directed column crystal of radiation shape along blade radial.
Because crystal boundary isolates effect to the foundry goods human body, very big to the turbine harm of rotating at a high speed in hot environment, can reduce the high-temperature creep resistance of turbine significantly.The crystallographic orientation turbine of present technique manufacturing has improved the high-temperature creep resistance of turbine owing to reduced the root of blade number of grain boundaries of harmfulness maximum, has strengthened the reliability of turbine work, provides key components and parts for producing high performance turbocharger.Present technique only need just can be produced the crystallographic orientation turbine in enormous quantities with equipment such as homemade system shell, roasting, meltings.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is the involucrum schematic diagram.
Fig. 3 is the vanning schematic diagram.
Fig. 4 is the crystal grain state diagram when utilizing prior art to produce turbine.
Fig. 5 is the crystal grain state diagram that utilizes after the present invention produces turbine.
Specific implementation method
1, involucrum: the direction for strictness control alloy graining process hot-fluid, alloy liquid is solidified along the direction of expection all the time, we wrap the insulation material 3 of 1～10mm on the plane of the big end formwork 2 of turbine, specifically shown in 2 figure; Wherein 1 be running gate system.
2, vanning back-up sand: form an efficient temperature gradient for making the alloy graining interface energy, guarantee blade place metal grain along the direction opposite with hot-fluid to liquid growth, obtain directed column crystal, fill out with quartz sand 5 in the formwork outside deposited, top and bottom thermal insulation board 4.Concrete mode is shown in 3 figure;
3, roasting: lose volatile matter and moisture in order to burn, improve form strength, the temperature difference when reducing pouring metal melt, must carry out roasting to formwork, when doing crystallographic orientation, need improve sintering temperature to help the formation temperature gradient, adopt 850～1300 ℃ sintering temperature, equipment is chamber type electric resistance furnace.
4, melting: the turbine material is a nickel-base alloy, adopts and waits the melting of axle vacuum pressing and casting induction melting furnace.When melting,, must improve pouring temperature, adopt 1450 ℃～1700 ℃ pouring temperature in order to reach favourable thermograde.
5, cooling: placed under vacuum state 2～30 minutes the cast back, and whole molten metal is slowly dispelled the heat, and the orderly propelling of molten metal boundary forms directed crystal grain.
The turbine crystal grain situation of producing according to above-mentioned condition is as shown in Figure 5: average A＜1 of the crystal boundary of blade, and formed directed column crystal at the key area of blade.So integral turbine has reached the requirement of crystallographic orientation.As can be seen from Figure 4, the column crystal of white is rambling on the blade, and the column crystal among Fig. 5 then is directed, distributes radially.
Claims (1)
1, the orientated crystallization method of integral turbine: a, involucrum: the insulation material (3) of wrapping 1～10mm at the big transverse plane of turbine formwork; B, vanning back-up sand: with the turbine formwork sandbox of packing into, and fill out depositedly with quartz sand (5), sandbox inner bottom surface and/or sandbox end face are provided with thermal insulation board (4); C, roasting: need improve sintering temperature when doing crystallographic orientation, sintering temperature is 850～1300 ℃; D, melting: nickel-base alloy melting in waiting axle vacuum pressing and casting induction melting furnace, when 1450 ℃～1700 ℃ temperature, pour into a mould; 5, cooling: after the cast, under vacuum state, placed 2～30 minutes, the turbine centre slowly cooled off, from turbine core portion to outer rim formation temperature gradient, in cooling procedure from outer rim to the center consecutive solidification, on turbo blade, form radial directed column crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100389241A CN1323784C (en) | 2005-04-15 | 2005-04-15 | Integral turbine orientated crystallization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100389241A CN1323784C (en) | 2005-04-15 | 2005-04-15 | Integral turbine orientated crystallization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1676243A CN1676243A (en) | 2005-10-05 |
| CN1323784C true CN1323784C (en) | 2007-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100389241A Active CN1323784C (en) | 2005-04-15 | 2005-04-15 | Integral turbine orientated crystallization method |
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| CN (1) | CN1323784C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100398232C (en) * | 2005-11-01 | 2008-07-02 | 中国科学院金属研究所 | Preparation technique of integral turbine of possessing twin crystal organization structure |
| CN104874786A (en) * | 2015-05-21 | 2015-09-02 | 西安航空动力股份有限公司 | Grain size control method for narrow-string thin-wall ultra-long type low vortex work blade |
| CN114316573B (en) * | 2022-01-07 | 2023-02-03 | 南京航空航天大学 | Preparation method of slurry-based oriented ordered three-dimensional communication network electric conduction and heat conduction structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4212410A1 (en) * | 1992-04-13 | 1993-10-14 | Sulzer Mtu Casting Technology | Casting unit for the production of a plurality of castings |
| WO2000051761A1 (en) * | 1998-11-20 | 2000-09-08 | Allison Engine Company, Inc. | Method and apparatus for production of a cast component |
| CN1597189A (en) * | 2004-08-31 | 2005-03-23 | 西北工业大学 | High gradient biregion heating directional solidification device |
-
2005
- 2005-04-15 CN CNB2005100389241A patent/CN1323784C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4212410A1 (en) * | 1992-04-13 | 1993-10-14 | Sulzer Mtu Casting Technology | Casting unit for the production of a plurality of castings |
| WO2000051761A1 (en) * | 1998-11-20 | 2000-09-08 | Allison Engine Company, Inc. | Method and apparatus for production of a cast component |
| CN1597189A (en) * | 2004-08-31 | 2005-03-23 | 西北工业大学 | High gradient biregion heating directional solidification device |
Non-Patent Citations (1)
| Title |
|---|
| 航空铸造涡轮叶片合金工艺发展的回顾与展望 陈荣章，航空制造技术，第2卷 2002 * |
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| CN1676243A (en) | 2005-10-05 |
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| C06 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuxi Fanniweier Engineering Co., Ltd. Assignor: Wuxi Power Engineering Co., Ltd. Contract fulfillment period: 2007.7.26 to 2015.3.31 contract change Contract record no.: 2008320000160 Denomination of invention: Integral turbine orientated crystallization method Granted publication date: 20070704 License type: Exclusive license Record date: 2008.9.22 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.7.26 TO 2015.3.31 Name of requester: NONE WUXI CITY NEWMAN INDUSTRIAL GAS PURIFICATION Effective date: 20080922 |