CN109622888B - Casting forming process of complex high-temperature alloy multi-connection guide blade casting - Google Patents
Casting forming process of complex high-temperature alloy multi-connection guide blade casting Download PDFInfo
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- CN109622888B CN109622888B CN201811562817.2A CN201811562817A CN109622888B CN 109622888 B CN109622888 B CN 109622888B CN 201811562817 A CN201811562817 A CN 201811562817A CN 109622888 B CN109622888 B CN 109622888B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- 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
Abstract
The invention discloses a casting molding process of a complex high-temperature alloy multi-connected guide vane casting, and belongs to the technical field of precision casting. The process comprises preparing a wax mold of a casting body, and welding the wax mold with a pouring system to form a module; coating refractory paint layer by layer on the module, feeding the module into a dewaxing kettle for dewaxing, and feeding the module into a roasting furnace for high-temperature pre-roasting; wrapping and binding fireproof heat-insulating cotton outside the shell in a step-shaped manner; remelting and smelting the high-temperature alloy bar to obtain high-temperature alloy molten metal; before casting, the shell is sent into the roasting furnace again, then the shell is sent into a vacuum induction casting furnace, and the high-temperature alloy molten metal is cast into the shell; and (4) preserving heat after the pouring is finished, and removing shells, cutting, sandblasting and polishing after the casting is finished. The invention effectively reduces or eliminates the casting defects of looseness, cracks and the like easily generated at the connecting position of the hot link blade and the small edge plate, improves the yield to 75-80%, and is suitable for casting the complex high-temperature alloy multi-connection guide blade.
Description
Technical Field
The invention relates to a casting molding process of a complex high-temperature alloy multi-connected guide vane casting, and belongs to the technical field of precision casting.
Background
The high-temperature alloy is also called as heat-resistant alloy and superalloy, and refers to a metal material with long-time creep resistance, high strength and corrosion resistance at the temperature of over 600 ℃ and under the action of stress, and based on the outstanding performance of the high-temperature alloy in a high-temperature working environment, the high-temperature alloy is widely applied to the hot end of an aeroengine and a gas turbine, namely a power turbine part. The guide blade (stationary blade) is used as a typical casting at the hot end, a complex thin-wall multi-blade conjoined structure is mostly adopted, the thickness change of the whole structure is large, and the guide blade works under the environments of extreme high temperature, complex load, oxidizing atmosphere and corrosive gas for a long time, so that extremely high requirements are provided on the dimensional precision requirement and the internal quality of the casting. Because molten metal fills the mould and turbulences in the casting pouring process, the time of filling the mould of each blade mould shell is different, the heat dissipation of the cooling hot spot part is poor, the cooling state is complex, and the finished product rate is lower than 30 percent.
Aeroengines and gas turbine power turbine section guide blades (stationary blades) belong to the power turbine section in engines. Guide vane mainly comprises big flange plate, blade and little flange plate, and the guide vane that ally oneself with possesses following characteristics: 1. the blade body part belongs to zero-allowance precision casting, and the manufacturing precision of the blade profile is extremely high; the conjuncted structure of a plurality of blades (common duplex, triplet, quadruple, quintuplet, etc.) causes the blocked shrinkage of the casting, and the solidification shrinkage of each part is different, which brings great difficulty to the size control; the overall contour size of the casting is large, the thickness difference of the blade body and the large and small edge plates is large, the thickest part is 26mm, the thinnest part is only 0.9mm, the complete mold filling difficulty is large, and the casting has more heat consumption, so that casting defects such as looseness, shrinkage cavities and the like can be generated in the casting or on the surface of the casting, and therefore how to control the process to reduce the casting defects and improve the yield is an urgent problem to be solved.
Disclosure of Invention
In order to solve the problem of low yield caused by the fact that a plurality of casting defects exist in the interior or on the surface of a casting cast by the existing casting forming process of the multi-connected guide vane, the invention provides a casting forming process of a complex high-temperature alloy multi-connected guide vane casting, and the technical scheme is as follows:
the invention aims to provide a casting molding process of a high-temperature alloy multi-connected guide blade casting, wherein the multi-connected guide blade comprises a large edge plate, a small edge plate and a blade body, and the casting molding process comprises the following steps:
the method comprises the following steps: injecting wax materials into a metal mold by using a wax injection machine to prepare a multi-connected guide vane casting body wax mold, and assembling and welding the casting body wax mold and a pouring system together to obtain a module;
step two: coating refractory paint on the module layer by layer in a constant temperature and humidity chamber to prepare a molding shell;
step three: feeding the shell into a dewaxing kettle for dewaxing;
step four: sending the dewaxed shell into a roasting furnace for high-temperature pre-roasting at 1050 +/-20 ℃;
step five: wrapping and binding the refractory heat-insulating cotton outside the shell subjected to the high-temperature pre-roasting treatment in the fourth step in a step-like manner; the step type mode is that two layers of refractory heat-insulating cotton are wrapped and bound at the positions of a riser and a pouring gate, one layer of refractory heat-insulating cotton is wrapped and bound at the position from a large edge plate of a casting to the middle of the casting, and the lower half part of the casting is not wrapped with the refractory heat-insulating cotton; the single-layer thickness of the fireproof heat-preservation cotton is 3mm-10 mm;
step six: remelting and smelting the high-temperature alloy bar by using a vacuum induction smelting furnace to obtain high-temperature alloy molten metal;
step seven: before casting, the shell processed in the fifth step is sent into a roasting furnace again to be subjected to high-temperature final roasting at 1050 +/-20 ℃, then the shell is sent into a vacuum induction casting furnace, and the high-temperature alloy molten metal prepared in the sixth step is cast into the shell at the casting temperature of 1500 +/-10 ℃;
step eight: after the pouring is finished, preserving the heat for 5min-10min in a vacuum state, and then discharging and cooling;
step nine: and obtaining the high-temperature alloy multi-connected guide vane casting through shell cleaning, cutting, sand blasting and polishing.
Preferably, the casting system in the first step adopts a free casting head.
More preferably, the in-gate portion of the conformal casting head is arranged on the large edge plate corresponding to the position of each blade of the multi-guide blade casting.
Preferably, the dewaxing in the third step is carried out at a pressure of 0.4MPa to 0.6MPa and a temperature of 140 ℃ to 160 ℃.
Preferably, in step seven the shell is removed from the roaster for no more than 8 minutes until the casting is complete.
Preferably, the remelting and smelting in the sixth step are carried out under the conditions that the opening vacuum degree, the smelting vacuum degree and the pouring vacuum degree are not more than 0.665Pa, the tapping temperature is 1560 +/-20 ℃, and the pouring temperature is 1500 +/-10 ℃.
Preferably, in the step one, two tie bars are resistance-welded between the large edge plate and the small edge plate of the wax mould of the casting body; the two tie bars are resistance welded on one side of the air inlet duct with the large blade profile.
Preferably, the coating of the refractory coating layer by layer in the second step is performed according to the following conditions:
the first layer is coated by taking a mixture of 35S-45S-viscosity silica sol and cobalt aluminate as a coating, then a layer of 100-120-mesh white corundum is scattered, and natural drying is carried out for at least 17 hours;
coating the second layer with a mixture of silica sol with viscosity of 8S-13S and white corundum as a coating, then scattering a layer of white corundum with 100-120 meshes, and naturally drying for at least 17 h;
coating and hanging a third layer by taking a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, then scattering a layer of 30-60-mesh bauxite, naturally drying for 0.5-1 h, and then air-drying for 2-3 h;
coating and hanging a fourth layer by using a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, then scattering a layer of bauxite with 16 meshes-30 meshes, and air-drying for 2.5h-3 h;
the fifth layer to the eleventh layer are treated the same as the fourth layer;
the twelfth layer is coated and hung by taking a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, does not sand, and is air-dried for at least 12 hours;
the temperature of the constant temperature and humidity chamber of the first layer and the second layer is controlled to be 18-22 ℃ and the humidity is controlled to be 60-80% during coating, and the temperature of the constant temperature and humidity chamber of the other layers is controlled to be 20-25 ℃ and the humidity is controlled to be 40-60% during coating.
The invention relates to a casting molding process of a complex high-temperature alloy multi-connected guide blade, which is a method capable of sequentially controlling the directional solidification of high-temperature alloy, and comprises the following steps: 1. the shell is heated by a roasting furnace to increase the temperature of the shell, so as to improve the filling characteristic of the molten metal after the molten metal is poured into the shell. 2. The method comprises the following steps of controlling the sequence of metal solidification by adopting a step type mode (two layers of refractory heat-preservation cotton are wrapped and bound at the positions of a riser and a pouring gate, one layer of refractory heat-preservation cotton is wrapped and bound at the position from a large edge plate of a casting to the middle of the casting, and the lower half part of the casting is not wrapped by the refractory heat-preservation cotton) to wrap heat-preservation refractory cotton outside a shell, so that the casting is solidified in sequence to eliminate or reduce the generation of casting defects; 3. reasonable smelting temperature, pouring temperature and vacuum furnace vacuumizing indexes are adopted to ensure the casting molding of the complex high-temperature alloy multi-connected guide blade to the maximum extent;
the invention has the beneficial effects that:
1. the free casting head is adopted in the casting system, the free casting head is designed according to the structural characteristics of the guide blade, the feeding and filling capacity of the high-temperature alloy is pertinently enhanced for each blade type, the stress on a casting at the large edge plate part after cooling is reduced, and the possibility of casting defects such as shrinkage cavity, shrinkage porosity and the like is reduced or avoided.
2. Adopt the notch cuttype to wrap up the heat preservation cotton outside the shell, wrap up and tie up two-layer fire-resistant heat preservation cotton in rising head and pouring gate position promptly, wrap up and tie up the fire-resistant heat preservation cotton of one deck in the big flange of foundry goods to foundry goods intermediate position, the foundry goods latter half does not wrap up fire-resistant heat preservation cotton, can make the foundry goods lower extreme cool off at first like this, the foundry goods middle section is cooling off secondly, the rising head cools off at last, the order solidifies, strengthens feeding effect, reduces casting defect.
3. In the prior art, the pouring temperature is generally set to 1460 +/-10 ℃, the optimized pouring temperature is 1500 +/-10 ℃, and the final roasting temperature of the shell is 1050 +/-20 ℃, so that the forming and feeding effects of the thin-leaf type and the thin-wall part of the casting can be effectively enhanced.
4. And a lacing wire is added on one side (the side of the air inlet) with the larger blade profile of the casting, so that the stress deformation of the casting is effectively reduced.
5. The invention effectively solves the problem of casting molding of a high-temperature alloy casting with a multi-connected complex structure, reduces or eliminates the casting defects of looseness, cracks and the like which are easily generated at the connecting position of the hot-link blade and the small edge plate, and improves the yield from 30% to 75-80%.
Drawings
FIG. 1 is a photograph of a stepped type of refractory heat-insulating cotton wrapped outside a shell.
Fig. 2 is a photograph of the tapping after the final firing of the shell.
FIG. 3 is a photograph of the mold shell taken out of the furnace after casting in a vacuum furnace.
FIG. 4 is a schematic diagram of a casting and a pouring system of the complex high-temperature alloy multi-connected guide vane casting.
FIG. 5 is an X-ray detector of the superalloy multi-connected guide vane casting prepared in example 1.
FIG. 6 is an X-ray detector of the superalloy multi-guide vane casting prepared as a control.
FIG. 7 is a partial enlarged view of the casting defect of the X-ray detection chip of the superalloy multi-connected guide vane casting prepared in the control group.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1
The embodiment provides a casting forming process of a complex high-temperature alloy multi-connected guide blade, wherein the multi-connected guide blade comprises a large edge plate, a small edge plate and a blade body, and the process comprises the following steps:
the method comprises the following steps: injecting wax materials into the metal mould by using a wax injection machine to prepare a casting body wax mould, and assembling and welding the casting body wax mould and the casting system together to obtain a module;
step two: coating refractory paint on the module layer by layer in a constant temperature and humidity chamber to prepare a molding shell; the specific requirements are shown in table 1;
step three: feeding the shell into a dewaxing kettle for dewaxing under the pressure of 0.4-0.6 MPa and the temperature of 140-160 ℃;
step four: sending the dewaxed shell into a roasting furnace for high-temperature pre-roasting at 1050 +/-20 ℃;
step five: wrapping and binding the refractory heat-insulating cotton outside the shell subjected to the high-temperature pre-roasting treatment in the fourth step in a step-like manner; the step type mode is that two layers of refractory heat-insulating cotton are wrapped and bound at the positions of a riser and a pouring gate, one layer of refractory heat-insulating cotton is wrapped and bound at the position from a large edge plate of a casting to the middle of the casting, the lower half part of the casting is not wrapped with the refractory heat-insulating cotton, and the single-layer thickness of the refractory heat-insulating cotton is 5 mm; the photo of the step-shaped shell wrapped with the refractory heat-insulating cotton is shown in figure 1;
step six: remelting and smelting the high-temperature alloy bar by using a vacuum induction smelting furnace under the conditions that the starting vacuum degree, the smelting vacuum degree and the pouring vacuum degree are all 0.665Pa, the tapping temperature is 1560 +/-20 ℃, and the pouring temperature is 1500 +/-10 ℃ to obtain high-temperature alloy molten metal;
step seven: before casting, the shell processed in the fifth step is sent into a roasting furnace again to be subjected to high-temperature final roasting at 1050 +/-20 ℃, a discharging photo of the shell after final roasting is shown in figure 2, then the shell is sent into a vacuum induction casting furnace, and the high-temperature alloy molten metal prepared in the sixth step is cast into the shell, wherein the casting temperature is 1500 +/-10 ℃; the shell is taken out of the roasting furnace until the shell is poured for not more than 8 minutes; the photograph of the cast shell taken out of the vacuum furnace after casting is shown in FIG. 3;
step eight: after the pouring is finished, preserving the heat for 5min-10min in a vacuum state, and then discharging and cooling;
step nine: and obtaining the high-temperature alloy multi-connected guide vane casting through shell cleaning, cutting, sand blasting and polishing.
TABLE 1 refractory coating conditions and Dry Room temperature and humidity requirements during Shell preparation
The temperature of the constant temperature and humidity chamber of the first layer and the second layer is controlled to be 18-22 ℃ and the humidity is controlled to be 60-80% during coating, and the temperature of the constant temperature and humidity chamber of the other layers is controlled to be 20-25 ℃ and the humidity is controlled to be 40-60% during coating. In the coating process, each layer is coated with a layer of coating and then sprinkled with a layer of sand.
As a preferable scheme of this embodiment, as shown in fig. 4, in the first step, two tie bars are resistance-welded between the large flange plate and the small flange plate of the wax mold of the casting body; two tie bars are resistance welded on one side of the air inlet channel with the large blade profile thickness. By adding the lacing wire on the side (the side of the air inlet) with the larger thickness of the cast blade profile, the stress deformation of the cast can be effectively reduced.
The high-temperature alloy multi-connection guide blade casting prepared by the embodiment has no casting defects such as obvious shrinkage cavities, looseness, cracks and the like at all positions, has good overall quality, has the yield up to 80 percent, and overcomes the problems of low yield caused by the fact that the processing technology of the multi-connection guide blade is difficult to control and more casting defects occur.
Example 2
This example differs from example 1 in that: step five: the single-layer thickness of the fireproof heat-preservation cotton is 3 mm.
The high-temperature alloy multi-connection guide blade casting prepared by the embodiment has no casting defects such as obvious shrinkage cavities, looseness, cracks and the like at all positions, has good overall quality, has a yield up to 78%, and overcomes the problems that the processing technology of the multi-connection guide blade is difficult to control, and the yield is low due to the occurrence of more casting defects.
Example 3
This example differs from example 1 in that: step five: the single-layer thickness of the fireproof heat-preservation cotton is 10 mm.
The high-temperature alloy multi-connection guide blade casting prepared by the embodiment has no casting defects such as obvious shrinkage cavities, looseness, cracks and the like at all positions, has good overall quality, has the yield up to 75 percent, and overcomes the problems of low yield caused by the fact that the processing technology of the multi-connection guide blade is difficult to control and more casting defects occur.
Example 4
This example differs from example 1 in that: the casting system adopts a free-form casting head, and an inner pouring gate part of the free-form casting head is arranged on a large edge plate corresponding to the position of each blade of the multi-connected guide blade casting. The feeding and filling capacity of the high-temperature alloy can be enhanced by each blade type, the stress on the large-edge plate casting after cooling is reduced, and the possibility of casting defects such as shrinkage cavity, shrinkage porosity and the like is reduced or avoided.
The high-temperature alloy multi-connection guide blade casting prepared by the embodiment has no casting defects such as obvious shrinkage cavities, looseness, cracks and the like at all positions, has good overall quality, has the yield up to 80 percent, and overcomes the problems of low yield caused by the fact that the processing technology of the multi-connection guide blade is difficult to control and more casting defects occur.
In order to illustrate the effect which can be obtained by wrapping the shell in a stepped manner, the invention also takes the technical scheme that the shell is not wrapped with heat preservation cotton in a stepped manner (namely, the shell is not wrapped with any heat preservation cotton) and other steps are the same as those in the embodiment 1 as a comparison group, the high-temperature alloy multi-connection guide vane casting prepared in the embodiment 1 and the comparison group is detected for the internal quality of the casting by adopting X-ray inspection, and an X-ray detection sheet of the high-temperature alloy multi-connection guide vane casting prepared in the embodiment 1 is shown in figure 5; the X-ray detection sheet of the superalloy multi-connected guide vane casting prepared in the control group is shown in FIG. 6. From fig. 5 it is clear that the casting is free of obvious casting defects and of good quality. The x-ray inspection piece of fig. 6 shows a large shrinkage cavity at the corner where the small edge plate is connected with the blade, and casting defects appear, and a partial enlarged view of the defects is shown in fig. 7. Thus, it can be seen that: according to the invention, the heat-insulating cotton is wrapped outside the shell in a step-type manner, so that the feeding effect can be enhanced, the casting defects are reduced, and the yield is improved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The casting forming process of the high-temperature alloy multi-connected guide vane casting comprises a large edge plate, a small edge plate and a vane body, and is characterized by comprising the following steps of:
the method comprises the following steps: injecting wax materials into a metal mold by using a wax injection machine to prepare a multi-connected guide vane casting body wax mold, and assembling and welding the casting body wax mold and a pouring system together to obtain a module;
step two: coating refractory paint on the module layer by layer in a constant temperature and humidity chamber to prepare a molding shell;
step three: feeding the shell into a dewaxing kettle for dewaxing;
step four: sending the dewaxed shell into a roasting furnace for high-temperature pre-roasting at 1050 +/-20 ℃;
step five: wrapping and binding the refractory heat-insulating cotton outside the shell subjected to the high-temperature pre-roasting treatment in the fourth step in a step-like manner; the step type mode is that two layers of refractory heat-insulating cotton are wrapped and bound at the positions of a riser and a pouring gate, one layer of refractory heat-insulating cotton is wrapped and bound at the position from a large edge plate of a casting to the middle of the casting, and the lower half part of the casting is not wrapped with the refractory heat-insulating cotton; the single-layer thickness of the fireproof heat-preservation cotton is 3mm-10 mm;
step six: remelting and smelting the high-temperature alloy bar by using a vacuum induction smelting furnace to obtain high-temperature alloy molten metal;
step seven: before casting, the shell processed in the fifth step is sent into a roasting furnace again to be subjected to high-temperature final roasting at 1050 +/-20 ℃, then the shell is sent into a vacuum induction casting furnace, and the high-temperature alloy molten metal prepared in the sixth step is cast into the shell at the casting temperature of 1500 +/-10 ℃;
step eight: after the pouring is finished, preserving the heat for 5min-10min in a vacuum state, and then discharging and cooling;
step nine: obtaining a high-temperature alloy multi-connected guide vane casting through shell cleaning, cutting, sand blasting and polishing;
adopting a conformal casting head for the casting system in the step one;
and the inner pouring gate part of the conformal casting head is arranged on the large edge plate corresponding to the position of each blade of the multi-connected guide blade casting.
2. The foundry molding process of claim 1, wherein the dewaxing of step three is performed at a pressure of 0.4MPa to 0.6MPa and a temperature of 140 ℃ to 160 ℃.
3. The foundry molding process of claim 1, wherein in step seven the shell is removed from the roaster for no more than 8 minutes until the pour is complete.
4. The casting and forming process of claim 1, wherein the remelting and smelting in the sixth step are carried out under the conditions that the degree of vacuum for melting, the degree of vacuum for smelting and the degree of vacuum for pouring are not more than 0.665Pa, the tapping temperature is 1560 +/-20 ℃, and the pouring temperature is 1500 +/-10 ℃.
5. The casting molding process according to claim 1, wherein in the first step, two tie bars are resistance-welded between the large edge plate and the small edge plate of the wax mold of the casting body; the two tie bars are resistance welded on one side of the air inlet duct with the large blade profile.
6. The foundry molding process of claim 1, wherein the coating of the refractory coating layer by layer in step two is performed according to the following conditions:
the first layer is coated by taking a mixture of 35S-45S-viscosity silica sol and cobalt aluminate as a coating, then a layer of 100-120-mesh white corundum is scattered, and natural drying is carried out for at least 17 hours;
coating the second layer with a mixture of silica sol with viscosity of 8S-13S and white corundum as a coating, then scattering a layer of white corundum with 100-120 meshes, and naturally drying for at least 17 h;
coating and hanging a third layer by taking a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, then scattering a layer of 30-60-mesh bauxite, naturally drying for 0.5-1 h, and then air-drying for 2-3 h;
coating and hanging a fourth layer by using a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, then scattering a layer of bauxite with 16 meshes-30 meshes, and air-drying for 2.5h-3 h;
the fifth layer to the eleventh layer are treated the same as the fourth layer;
the twelfth layer is coated and hung by taking a mixture of silica sol with the viscosity of 8S-13S and bauxite as a coating, does not sand, and is air-dried for at least 12 hours;
the temperature of the constant temperature and humidity chamber of the first layer and the second layer is controlled to be 18-22 ℃ and the humidity is controlled to be 60-80% during coating, and the temperature of the constant temperature and humidity chamber of the other layers is controlled to be 20-25 ℃ and the humidity is controlled to be 40-60% during coating.
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| CN116906126B (en) * | 2023-09-14 | 2023-12-08 | 中国航发北京航空材料研究院 | Multi-body guide vane of ceramic matrix composite and single crystal superalloy and preparation method thereof |
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| US4186222A (en) * | 1975-09-20 | 1980-01-29 | Rolls-Royce (1971) Limited | Mould insulation |
| CN104001857B (en) * | 2014-06-06 | 2016-02-10 | 哈尔滨鑫润工业有限公司 | A kind of Gas Turbine guide vane and precision casting technology thereof |
| CN104308076B (en) * | 2014-10-29 | 2016-09-07 | 西安航空动力股份有限公司 | The wax-pattern combination of the hollow turborotor of a kind of tetrad and fine casting method thereof |
| CN105290337B (en) * | 2015-11-16 | 2017-07-25 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of concatermer blade casting method |
| CN107755635A (en) * | 2017-09-12 | 2018-03-06 | 东方电气集团东方汽轮机有限公司 | A kind of method for solving combustion engine shrouded blade leaf top R angles fire check |
| CN107598097B (en) * | 2017-11-10 | 2020-04-10 | 东方电气集团东方汽轮机有限公司 | Wax mold combination of turbine guide blade and precision casting method thereof |
| CN107931544A (en) * | 2017-12-27 | 2018-04-20 | 安徽应流航源动力科技有限公司 | A kind of conjuncted hollow guide vane investment casting process |
| CN108176817B (en) * | 2018-01-10 | 2019-09-03 | 中国航发北京航空材料研究院 | A kind of loose control method of elongated thin-walled band hat equiax crystal casting turbo blade |
| CN108941455B (en) * | 2018-07-27 | 2020-08-14 | 沈阳中科三耐新材料股份有限公司 | Casting method of duplex turbine guide vane for gas turbine |
| CN108941459B (en) * | 2018-09-05 | 2020-10-09 | 中国航发动力股份有限公司 | Method for reducing turbine blade looseness of combustion engine |
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