CN113070454A - Casting device and method for non-preferred orientation single crystal guide hollow blade - Google Patents
Casting device and method for non-preferred orientation single crystal guide hollow blade Download PDFInfo
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- CN113070454A CN113070454A CN202110289907.4A CN202110289907A CN113070454A CN 113070454 A CN113070454 A CN 113070454A CN 202110289907 A CN202110289907 A CN 202110289907A CN 113070454 A CN113070454 A CN 113070454A
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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
- 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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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
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Abstract
The invention relates to a casting device for a non-preferred orientation single crystal guide hollow blade, belonging to the technical field of casting of turbine blades of aero-engines. The casting device for the non-preferred orientation single crystal guide hollow blade comprises an upper disc connected to the bottom end of a sprue cup, wherein the bottom end of the upper disc is communicated with one end of a feeding head, the other end of the feeding head is connected with a blade wax mold, and the upper end of a seed crystal amplifier is connected with a secondary amplifier. Has the advantages that: due to the application of seed crystals and the seeding auxiliary pouring channel, the blade edge plate and the blade body have no mixed crystals, the integrity of the single crystal is good, the deviation degree and the dispersion degree of the orientation of the blade are effectively controlled, and the crystal orientation deviation of the single crystal guide hollow blade is realized within 10 degrees; the design of the dead head casting scheme effectively solves the problem of metallurgical defects of the edge plate, obviously improves the yield and reduces the production cost; the manufacturing of the free end of the mold core effectively avoids the over-tolerance of the wall thickness of the hollow guide blade.
Description
Technical Field
The invention belongs to the technical field of casting of turbine blades of aeroengines, and particularly relates to a casting device and method of a non-preferred orientation single crystal guide hollow blade.
Background
In recent years, under the large background that national defense and military industry are vigorously developed in China and great attention is given to the aviation engine industry, guide blades of various types are gradually required to be cast single crystal blades, and the guide blades are complex in structure, difficult to form and extremely high in process requirement. The edge plate of the guide blade has the long cantilever characteristic, and the size of the blade is large, so that the wax piece and the casting are easy to warp, deform and the like in the contraction process, the integrity of a single crystal is difficult to ensure, the defects of impurity crystals of the edge plate, impurity crystals of a blade body and recrystallization are difficult to solve, and the orientation control is more difficult; the large and small edge plates are thick, feeding is difficult in the melt injection process, the edge plates are loose seriously, the metallurgical quality is difficult to ensure, and the production efficiency of the blade is seriously influenced; the guide hollow blade has a complex inner cavity, has high requirements on the size and the high-temperature strength of a core, and easily causes the casting to deviate and leak due to insufficient high-temperature strength of the core, so that the wall thickness is unqualified, and the casting qualification rate is low.
Because the size of the single crystal guide structure is large, the inner cavity is complex, the orientation control difficulty is high, and the non-preferred crystal orientation is prepared, the traditional crystal selection method process can only prepare the [001] preferred orientation of the single crystal high-temperature alloy, and can not meet the preparation conditions of the [111] non-preferred orientation single crystal guide blade, but the growth of the single crystal high-temperature alloy non-preferred orientation [111] can be realized through a seed crystal method, the thickness of the upper and lower edge plates of the blade is 1cm, the size of the edge plate is large, the integral formation of the single crystal is difficult, and the rejection rate of mixed crystals is high.
Therefore, a casting device and a casting method for a non-preferred orientation single crystal guide hollow blade are provided to solve the defects in the prior art.
Disclosure of Invention
The invention provides a casting device for a non-preferred orientation single crystal guide hollow blade, which solves the technical problems, and the casting device has the advantages that due to the application of seed crystals and a seeding auxiliary pouring channel, a blade edge plate and a blade body have no mixed crystals, the integrity of single crystals is good, the deviation degree and the dispersion degree of the orientation of the blade are effectively controlled, and the deviation of the orientation of the single crystal guide hollow blade crystals is within 10 degrees; the design of the dead head casting scheme effectively solves the problem of metallurgical defects of the edge plate, obviously improves the yield and reduces the production cost; the manufacturing of the free end of the mold core effectively avoids the over-tolerance of the wall thickness of the hollow guide blade.
The technical scheme for solving the technical problems is as follows: the casting device for the non-preferred orientation single crystal guide hollow blade comprises a sprue cup, an upper disc, a support runner, a lower disc, a seed crystal amplifier and a secondary amplifier, wherein the bottom end of the sprue cup is connected with the upper disc, the bottom end of the upper disc is communicated with one end of a feeding head, the other end of the feeding head is connected with a blade wax mold, the upper end of the seed crystal amplifier is connected with the secondary amplifier, one end of the seed crystal extends into the seed crystal amplifier, the other end of the seed crystal is vertically connected with the lower disc, the secondary amplifier is connected with the lower end of the blade wax mold, a crystal guide rod is bonded at the lower end of the blade wax mold from the four peripheral corners of a lower edge plate of the blade wax mold to the peripheral corners of an upper edge plate of the blade wax mold, and a core boss for manufacturing a free end of a core is arranged on.
Has the advantages that: due to the application of seed crystals and the seeding auxiliary pouring channel, the blade edge plate and the blade body have no mixed crystals, the integrity of the single crystal is good, the deviation degree and the dispersion degree of the orientation of the blade are effectively controlled, and the crystal orientation deviation of the single crystal guide hollow blade is realized within 10 degrees; the design of the dead head casting scheme effectively solves the problem of metallurgical defects of the edge plate, obviously improves the yield and reduces the production cost; the manufacturing of the free end of the core effectively avoids the problems of the wall thickness dimension of the hollow guide blade and the core breaking of a casting.
Furthermore, one end of the crystal leading wafer, which is far away from the blade wax mold, is connected with a crystal leading rod.
The beneficial effect of adopting the further scheme is that: prevent the problem of shell cracking caused by too thin wax sheet.
Further, the diameter of the crystal-drawing rod is 4-6 mm.
The beneficial effect of adopting the further scheme is that: the structure is simple, crystal grains can smoothly grow to the position of the upper edge plate, mixed crystals at the corner position of the upper edge plate are avoided, and the integrity of the casting single crystal is improved.
Further, the length of the seed crystal extending into the seed crystal amplifier is more than 5 mm.
The beneficial effect of adopting the further scheme is that: the seed crystal is melted fully, the seed crystal is prevented from growing mixed crystal, and the crystal grain growing from the seed crystal is extended to the leaf body by the crystal grain extending amplifier.
Further, the length of the seed crystal is more than 15 mm.
The beneficial effect of adopting the further scheme is that: the requirements of wax mold combination are met, and the seed crystal has certain pressure bearing capacity.
Further, the wax material of the blade wax mould is medium-temperature wax, and the seed crystal amplifier and the secondary amplifier are low-temperature wax.
The beneficial effect of adopting the further scheme is that: is convenient for manufacturing.
Furthermore, a shared exhaust pipe is arranged between the sprue cup and the upper disc.
The beneficial effect of adopting the further scheme is that: and discharging gas in the mold shell during pouring.
A casting method of a non-preferred orientation single crystal guide hollow blade comprises a casting device of the non-preferred orientation single crystal guide hollow blade, and is characterized by comprising the following steps:
s1, preparing seed crystals:
marking the required crystal orientation on a single crystal test bar in advance by adopting a Laue method, cutting the single crystal test bar according to the axial direction of the seed crystal consistent with the orientation direction of the single crystal, and then carrying out macroscopic corrosion and single crystal integrity inspection on the single crystal test bar to obtain the seed crystal;
s2, pressing a wax mold:
pressing an upper disc, a lower disc, a sprue cup, a feeding head and a blade wax mold;
s3, connecting the seed crystal with the wax piece:
seed crystals are implanted into the seed crystal amplifier, and then the seed crystal amplifier is connected with the secondary amplifier;
s4, module combination:
connecting a secondary amplifier with the lower end of the blade wax mould, bonding a crystal seeding stick at the joint of the lower end to the peripheral corners of the lower edge plate of the blade wax mould, and then introducing the crystal seeding stick to the peripheral corners of the upper edge plate of the blade wax mould; then bonding a feeding head on the upper edge plate of the blade wax mould, and finally arranging a core boss on the surface of the lower edge plate of the blade wax mould;
s5, preparing a module formwork:
coating silica sol, white corundum powder and a mineralizer on the surface of a blade wax mould according to the powder-liquid ratio of 4-5:1, then dewaxing, and roasting after dewaxing to obtain a module mould shell;
s6, formwork melt injection:
and S5, pouring the module mould shell in a vacuum directional solidification mode, standing, pulling crystal in a sectional crystal pulling mode, cooling the mould shell, removing the shell, and finally obtaining a single crystal guide blade casting through procedures of cutting a pouring channel, decorticating, alkali boiling, heat treatment, corrosion inspection of single crystal integrity, polishing, repairing, fluorescence detection and X-ray detection.
Has the advantages that: the non-preferred orientation single crystal guide hollow blade is prepared by adopting a seed crystal method, the manufacturing is convenient, the cost is low, and the yield is obviously improved.
Further, in step S2, the pressure of injection is 0.25 MPa-20 MPa, the pressure maintaining time is 20S-180S, and the temperature of wax material is 40-80 ℃.
The beneficial effect of adopting the further scheme is that: ensuring the continuous and stable solidification process.
Further, in step S5, the thickness of the coating is 3mm-10 mm; dewaxing at 0.3-1 MPa and 100-200 deg.c; the roasting temperature is 800-1200 ℃ and the roasting time is 3-8 h.
The beneficial effect of adopting the further scheme is that: low cost, convenient manufacture and can reach the strength of bearing high-temperature alloy liquid after being dried.
Further, in step S6, the casting adopts 1500-1600 ℃ high-temperature alloy liquid, the standing time is 2-10 min, the crystal pulling speed is 3-8 mm/min, and the cooling time is 5-7 h.
The beneficial effect of adopting the further scheme is that: high size precision and good single crystal integrity.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a crystal orientation diagram of a single crystal guide hollow blade prepared by the method of the present invention;
FIG. 3 is one of metallographic structure of a single crystal guide hollow blade prepared by the method of the present invention;
FIG. 4 is one of metallographic structure of a single crystal guide hollow blade prepared by the method of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a pouring cup; 2. an exhaust pipe; 3. an upper disc; 4. supporting the pouring gate; 5. a lower disc; 6. seed crystal; 7. a seed crystal amplifier; 8. a secondary amplifier; 9. a core boss; 10. a blade wax pattern; 11. a crystal seeding rod; 12. and (5) feeding a shrink head.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in FIG. 1, the present embodiment provides a non-preferred orientation single crystal guide hollow blade casting apparatus comprising: a pouring cup 1, an upper disc 3, a supporting pouring gate 4, a lower disc 5, a seed crystal 6, a seed crystal amplifier 7 and a secondary amplifier 8, the bottom end of the pouring cup 1 is connected with the upper disc 3, the bottom end of the upper disc 3 is communicated with one end of a feeding head 12, the other end of the feeding head 12 is connected with the blade wax mould 10, the upper end of the seed crystal amplifier 7 is connected with the secondary amplifier 8, one end of the seed crystal 6 extends into the seed crystal amplifier 7, the other end is vertically connected with the lower disc 5, the second-stage amplifier 8 is connected with the lower end of the blade wax mould 10, a seeding stick 11 is bonded at the lower end of the blade wax mould 10 from the four peripheral corners of the lower edge plate of the blade wax mould 10 to the four peripheral corners of the upper edge plate of the blade wax mould 10, the diameter of the seeding roller 11 is 4-6mm, and a core boss 9 for manufacturing a free end of a core is arranged on the surface of the lower edge plate of the blade wax mould 10.
Due to the application of the seed crystal 6 and the seeding auxiliary runner, the blade edge plate and the blade body have no mixed crystal, the integrity of the single crystal is good, the deviation degree and the dispersion degree of the orientation of the blade are effectively controlled, and the crystal orientation deviation of the single crystal guide hollow blade is realized within 10 degrees; the design of the dead head casting scheme effectively solves the problem of metallurgical defects of the edge plate, obviously improves the yield and reduces the production cost; the manufacturing of the free end of the mold core effectively avoids the over-tolerance of the wall thickness of the hollow guide blade.
Preferably, in this embodiment, the length of the seed crystal 6 extending into the seed crystal amplifier 7 is greater than 5mm, which meets the requirement of the wax pattern combination, and the seed crystal has a certain pressure bearing capacity. And (3) probing depth: the length of the seed crystal 6 extending into the amplifier 7 should be greater than 5 mm. The seed crystal amplifier 7 is generally 15-30 mm in length and 20mm in diameter.
Preferably, in this embodiment, the wax material of the blade wax mold 10 is a medium temperature wax, and the seed crystal amplifier 7 and the secondary amplifier 8 are low temperature waxes.
Preferably, in this embodiment, a common exhaust pipe 2 is provided between the pouring cup 1 and the upper disc 3 to exhaust gas in the mold shell during pouring.
A casting method of a non-preferred orientation single crystal guide hollow blade comprises a casting device of the non-preferred orientation single crystal guide hollow blade, and is characterized by comprising the following steps:
s1, preparing seed crystals:
marking the required crystal orientation on a single crystal test bar in advance by adopting a Laue method, cutting the single crystal test bar according to the axial direction of the seed crystal consistent with the orientation direction of the single crystal, and then carrying out macroscopic corrosion and single crystal integrity inspection on the single crystal test bar to obtain the seed crystal;
s2, pressing a wax mold:
pressing an upper disc 3, a lower disc 5, a pouring cup 1, a feeding head 12 and a blade wax mold 10;
s3, connecting the seed crystal 6 with a wax piece:
the seed crystal 6 is implanted into the seed crystal amplifier 7, then the seed crystal amplifier 7 is connected with the secondary amplifier 8, and the diameter reduction platform between the secondary amplifier 8 and the seed crystal amplifier 7 can prevent the mixed crystal from continuously growing, thereby effectively improving the qualified rate of the single crystal integrity of the single crystal guide blade;
s4, module combination:
connecting a secondary amplifier 8 with the lower end of a blade wax mould 10, bonding a seeding stick 11 at the joint of the lower end to the peripheral corners of the lower edge plate of the blade wax mould 10, and then leading the lower edge plate of the blade wax mould 10 to the peripheral corners of the upper edge plate; then a feeding head 12 is bonded on the upper edge plate of the blade wax mould 10, and finally a core boss 9 is arranged on the surface of the lower edge plate of the blade wax mould 10, and the wax on the surface of the boss is completely removed to be used as the positioning of a core in a shell mould, so that the problem of unqualified wall thickness or core leakage of a casting caused by core deviation in the crystal pulling process of the single crystal guide blade is prevented, and the qualified rate of the casting can be effectively improved;
s5, preparing a module formwork:
coating silica sol, white corundum powder and a mineralizer on the surface of a blade wax mould 10 according to the powder-liquid ratio of 4-5:1, then dewaxing, and roasting after dewaxing to obtain a module mould shell;
s6, formwork melt injection:
and S5, pouring the module mould shell in a vacuum directional solidification mode, standing, pulling crystal in a sectional crystal pulling mode, cooling the mould shell, removing the shell, and finally obtaining a single crystal guide blade casting through procedures of cutting a pouring channel, decorticating, alkali boiling, heat treatment, corrosion inspection of single crystal integrity, polishing, repairing, fluorescence detection and X-ray detection.
Has the advantages that: the non-preferred orientation single crystal guide hollow blade is prepared by adopting a seed crystal method, the manufacturing is convenient, the cost is low, and the yield is obviously improved.
Preferably, in this embodiment, in step S2, the injection pressure is 0.25MPa to 20MPa, the pressure maintaining time is 20S to 180S, and the wax material temperature is 40 ℃ to 80 ℃, so as to ensure continuous and stable solidification process.
Preferably, in the present embodiment, in step S5, the thickness of the coating is 3mm to 10 mm; dewaxing at 0.3-1 MPa and 100-200 deg.c; the roasting temperature is 800-1200 ℃, the roasting time is 3-8 h, the cost is low, the manufacturing is convenient, and the strength of bearing high-temperature alloy liquid can be achieved after drying.
Preferably, in this embodiment, in step S6, a vacuum directional solidification furnace is used for casting. Placing a shell mold with a flat bottom surface and a clean bottom surface on a crystallizer, aligning the periphery of the shell mold, rotating the shell mold to enable the bottom of the shell mold to be tightly attached to the crystallizer, closing a furnace door to vacuumize, feeding the shell mold into a heater, heating the shell mold to 1500-1580 ℃ according to the shell mold, and preserving the heat for 15-30 min.
Directional solidification of single crystal guide blades: after the casting of the shell mold is finished at the temperature of 1500-1600 ℃, standing the shell mold for 2-10 min, pulling the shell mold in a segmented crystal pulling mode at the crystal pulling speed of 3-8 mm/min, moving the upper surface of an upper disc of the shell mold out of a baffle plate for 2min at 3mm/min, and then rapidly lowering the upper surface of the upper disc to a bottom position. When the shell mold is lowered to the bottom, the casting shell mold is taken out according to the operation specification, and the shell mold is covered by a heat insulation cotton sleeve (the thickness of the heat insulation cotton is 20 mm-40 mm). And (5) shelling after the shuttering is naturally cooled for 6 hours. The casting of the non-preferred orientation single crystal guide blade with qualified size and good single crystal integrity is obtained after the procedures of runner cutting, core removal and alkali boiling, heat treatment, corrosion check of single crystal integrity, polishing and repairing, fluorescence detection, X-ray detection and the like.
In the description of the present invention, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplicity of description, and do not indicate or imply that the system or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A casting apparatus for a non-preferentially oriented single crystal-guiding hollow blade, comprising: the bottom end of the sprue cup (1) is connected with the upper disc (3), the bottom end of the upper disc (3) is communicated with one end of a feeding head (12), the other end of the feeding head (12) is connected with a blade wax mold (10), the upper end of the seed crystal amplifier (7) is connected with the secondary amplifier (8), one end of the seed crystal (6) extends into the seed crystal amplifier (7), the other end of the seed crystal (6) is vertically connected with the lower disc (5), the secondary amplifier (8) is connected with the lower end of the blade wax mold (10), and a crystal-guiding rod (11) is bonded at the lower end of the blade wax mold (10) from the four peripheral corners of the lower edge plate of the blade wax mold (10) to the peripheral corners of the upper edge plate of the blade wax mold (10), and a core boss (9) used for manufacturing a free end of a core is arranged on the surface of the lower edge plate of the blade wax mould (10).
2. The casting device of a non-preferred orientation single crystal guiding hollow blade as claimed in claim 1, wherein the diameter of the seeding roller (11) is 4-6 mm.
3. A non-preferred orientation single crystal guide hollow blade casting apparatus as claimed in claim 1 wherein the length of the seed crystal (6) extending into the seed amplifier (7) is greater than 5 mm.
4. A non-preferred orientation single crystal guiding hollow blade casting device as claimed in claim 1 wherein the length of the seed crystal (6) is greater than 15 mm.
5. The casting device of a non-preferred orientation single crystal guide hollow blade as claimed in any one of claims 1 to 4, wherein the wax material of the blade wax pattern (10) is a medium temperature wax, and the seed amplifier (7) and the secondary amplifier (8) are low temperature waxes.
6. Casting device for non-preferentially oriented single crystal guiding hollow blades according to any of claims 1 to 4, characterized in that a common exhaust duct (2) is provided between the pouring cup (1) and the upper disc (3).
7. A casting method of a non-preferred orientation single crystal guide hollow blade comprising the casting apparatus of a non-preferred orientation single crystal guide hollow blade according to any one of claims 1 to 6, comprising:
s1, preparing seed crystals:
marking the required crystal orientation on a single crystal test bar in advance by adopting a Laue method, cutting the single crystal test bar according to the axial direction of the seed crystal consistent with the orientation direction of the single crystal, and then carrying out macroscopic corrosion and single crystal integrity inspection on the single crystal test bar to obtain the seed crystal;
s2, pressing a wax mold:
pressing an upper disc (3), a lower disc (5), a pouring cup (1), a feeding head (12) and a blade wax mold (10);
s3, connecting the seed crystal (6) with a wax piece:
the seed crystal (6) is implanted into the seed crystal amplifier (7), and then the seed crystal amplifier (7) is connected with the secondary amplifier (8);
s4, module combination:
connecting a secondary amplifier (8) with the lower end of a blade wax mould (10), bonding a seeding stick (11) at the joint of the lower end to the four peripheral corners of the lower edge plate of the blade wax mould (10), and then leading the seeding stick to the four peripheral corners of the upper edge plate of the blade wax mould (10); then a feeding head (12) is bonded on the upper edge plate of the blade wax mould (10), and finally a core boss (9) is arranged on the surface of the lower edge plate of the blade wax mould (10);
s5, preparing a module formwork:
coating silica sol, white corundum powder and a mineralizer on the surface of a blade wax mould (10) according to the powder-liquid ratio of 4-5:1, then dewaxing, and roasting after dewaxing to obtain a module mould shell;
s6, formwork melt injection:
and S5, pouring the module mould shell in a vacuum directional solidification mode, standing, pulling crystal in a sectional crystal pulling mode, cooling the mould shell, removing the shell, and finally obtaining a single crystal guide blade casting through procedures of cutting a pouring channel, decorticating, alkali boiling, heat treatment, corrosion inspection of single crystal integrity, polishing, repairing, fluorescence detection and X-ray detection.
8. The casting apparatus for hollow vane of non-preferred orientation single crystal orientation according to claim 7, wherein in step S2, the pressure of injection is 0.25MPa to 20MPa, the pressure holding time is 20S to 180S, and the temperature of wax is 40 ℃ to 80 ℃.
9. The casting apparatus for hollow vane of claim 7, wherein the coating thickness in step S5 is 3mm-10 mm; dewaxing at 0.3-1 MPa and 100-200 deg.c; the roasting temperature is 800-1200 ℃ and the roasting time is 3-8 h.
10. The casting apparatus for hollow vane of claim 7, wherein in step S6, the casting is performed by using 1500-1600 ℃ high temperature alloy liquid, the standing time is 2-10 min, the pulling speed is 3-8 mm/min, and the cooling time is 5-7 h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976824A (en) * | 2021-10-20 | 2022-01-28 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of core of conjoined single crystal guide blade |
| CN114309470A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendritic crystal broken arm defects at single crystal blade edge plate through temperature field regulation |
| WO2023184837A1 (en) * | 2022-03-28 | 2023-10-05 | 安徽应流航源动力科技有限公司 | Method for preventing single crystal hollow guide vane from being recrystallized |
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| CN113976824A (en) * | 2021-10-20 | 2022-01-28 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of core of conjoined single crystal guide blade |
| CN113976824B (en) * | 2021-10-20 | 2023-09-15 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of conjuncted single crystal guide blade core |
| CN114309470A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendritic crystal broken arm defects at single crystal blade edge plate through temperature field regulation |
| CN114309470B (en) * | 2021-12-31 | 2023-11-03 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendrite arm defects at edge plate of single crystal blade through temperature field regulation and control |
| WO2023184837A1 (en) * | 2022-03-28 | 2023-10-05 | 安徽应流航源动力科技有限公司 | Method for preventing single crystal hollow guide vane from being recrystallized |
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