CN115055641A - Single crystal guide blade and precision investment casting method thereof - Google Patents
Single crystal guide blade and precision investment casting method thereof Download PDFInfo
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- CN115055641A CN115055641A CN202210652031.XA CN202210652031A CN115055641A CN 115055641 A CN115055641 A CN 115055641A CN 202210652031 A CN202210652031 A CN 202210652031A CN 115055641 A CN115055641 A CN 115055641A
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- 239000013078 crystal Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005495 investment casting Methods 0.000 title claims abstract description 18
- 244000044283 Toxicodendron succedaneum Species 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000009415 formwork Methods 0.000 claims description 12
- 238000007711 solidification Methods 0.000 claims description 9
- 230000008023 solidification Effects 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 abstract 1
- 101150038956 cup-4 gene Proteins 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009416 shuttering Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- 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
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention discloses a single crystal guide blade and a precise investment casting method thereof, wherein the precise investment casting method comprises the steps of pressing a blade, a crystal selector and a wax mould of a casting system, when a tree is assembled, a central column is vertically arranged on a first conical table in the middle of a convex base plate, a cross gate and a sprue cup are connected by the central column, then the starting end of the crystal selector is connected with the side surface of the first conical table, the axial direction of the crystal selector is vertical to the side surface of the first conical table, the spiral end of the crystal selector is bonded at one corner at the bottom end of a lower edge plate of the wax mould of the blade, the axial direction of the crystal selector is kept parallel to the axial direction of a blade body of the wax mould, the cross gate is connected with one corner at the top end of the upper edge plate of the wax mould of the blade, a corresponding ceramic mould shell is made by using the formed wax tree, and the mould shell is placed on a convex chilling bottom plate with the same shape when the tree is smelted and cast. The method can be used for preparing the single crystal guide blade with the axial direction of the blade consistent with the crystal direction of the single crystal (001) and no loose defect on the surface of the edge plate.
Description
Technical Field
The invention belongs to the technical field of single crystal blade preparation, and particularly relates to a single crystal guide blade and a precision investment casting method thereof.
Background
The single crystal turbine blade, including rotor blades and guide vanes, is the core hot end component of an aircraft engine, where the guide vanes are more difficult to make into a single crystal casting due to the very wide flange. In order to optimize mechanical performance, the single crystal blade generally requires that the [ 001 ] orientation of the crystal is consistent with the axial direction of the blade body 8, which can be realized by vertically assembling the blade (figure 1), vertically installing a center column 2 in the middle of a plane chassis, connecting a cross pouring gate 3 and a pouring cup 4 by using the center column 2, bonding a crystal selector 6 with the same axial direction at the lower end of the blade, and vertically installing the crystal selector 6 on a plane chilling bottom plate 17. Molten metal is poured into a pouring cup 4, filled into a mould shell through a cross gate 3 and contacted with a plane chilling bottom plate 17 through a crystal selector. The heat flow of the crystal selector crystallization section enters the plane chilling plate 17 vertically downwards, and the crystal grains taking the [ 001 ] crystal orientation as the priority direction grow upwards along the direction opposite to the heat flow direction. That is, the single crystal grown in the crystal selector has a vertical [ 001 ] crystal orientation and extends to the whole blade, so that the axial direction of the blade is consistent with the [ 001 ] crystal orientation. This method is generally suitable for the production of monocrystalline rotor blades with a long and narrow blade body 8 and a narrow blade platform. For the guide blade, the single crystal growth is difficult to spread to a wide edge plate, the yield of the single crystal is not high, and the upper end surfaces of the wide lower edge plate 7 and the wide upper edge plate 9 cannot be fed, so that serious surface looseness can be generated.
In conclusion, there is a need for an improved method of manufacturing single crystal guide vanes.
Disclosure of Invention
The invention mainly aims to provide a single crystal guide blade and a precision investment casting method thereof, and aims to prepare the single crystal guide blade which has the axial direction consistent with the crystal direction of a single crystal (001) and has no loose defect on the surface of a flange plate.
To this end, an aspect of the present invention provides a method for investment casting of a single crystal guide blade, including:
s1 pressing wax mould
Pressing a blade, a crystal selector and a wax mold of a pouring system, wherein the pouring system comprises a convex chassis with a first cone frustum, a middle column, a cross gate and a pouring cup;
s2 wax model tree
Vertically installing a center post on a first conical table in the middle of a convex chassis, connecting a cross gate and a sprue cup by using the center post, then connecting the starting end of a crystal selector with the side surface of the first conical table, enabling the axial direction of the crystal selector to be vertical to the side surface of the first conical table, bonding the spiral end of the crystal selector at one corner of the bottom end of a lower edge plate of a blade wax mold, enabling the axial direction of the crystal selector to be parallel to the axial direction of a blade body of the blade wax mold, and connecting the cross gate with one corner of the top end of the upper edge plate of the blade wax mold to form a wax tree;
s3 preparation of formwork
Coating refractory paint on the wax trees layer by layer, drying and hardening, and then dewaxing and roasting to obtain a guide vane formwork;
s4, smelting and pouring
The smelting and pouring equipment is a vacuum directional solidification furnace, the shape and the size of a convex chilling bottom plate of the vacuum directional solidification furnace are consistent with those of a chassis of a formwork pouring system, and poured molten metal enters an inner cavity of a formwork through a pouring cup and a cross gate of the formwork and contacts with the side face of a second cone frustum in the middle of the convex chilling bottom plate through a crystal selector.
Specifically, when the wax pattern tree is assembled, a crystal guiding strip is connected between the downward inclination angles of the upper edge plate and the lower edge plate of the blade wax pattern.
Specifically, when the wax pattern trees are combined, a feeding strip is connected between the upwarping angles of the upper edge plate and the lower edge plate of the blade wax pattern.
Specifically, the inclination angle of the first truncated cone generatrix is 20-70 degrees.
Specifically, the inclination angle of the first truncated cone generatrix is 45 °.
Specifically, the axis of the center pillar coincides with the axis of the first truncated cone.
Specifically, the wax tree comprises a plurality of blade wax molds which are uniformly distributed around the first conical table, and each blade wax mold is connected with the side surface of the first conical table through a crystal selector.
Specifically, the convex chilling bottom plate adopts a copper water-cooling bottom plate.
In another aspect, the embodiment of the invention also provides a single crystal guide blade prepared by the precision investment casting method.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects:
1. a convex chassis wax mould with a first cone frustum is adopted, a crystal selector is bonded on the first cone frustum of the convex chassis when a wax tree is assembled, the axial direction of the crystal selector and the axial direction of a blade are perpendicular to the side surface of the first cone frustum, a mould shell is placed on a convex chilling bottom plate with the same shape during smelting and pouring, heat flow Q in the crystal selector enters the convex chilling bottom plate along the normal direction of the side surface of a second cone frustum on the convex chilling bottom plate after pouring, oriented grains grow along the opposite direction of the heat flow Q, single crystal growth parallel to the axial direction of the blade is obtained after the crystal selector, the heat flow Q grows into the oblique lower corner of a lower edge plate of the blade and then expands to the whole blade, and finally, a single crystal blade with the axial direction consistent with the single crystal (001) direction is obtained, and the requirement on the primary crystal direction of the single crystal blade is met.
2. The bottom of the mould shell is provided with a concave cavity matched with the convex chilling base plate, when the mould shell is assembled with the convex chilling base plate, the mould shell can be positioned by using a vacancy reserved on a first cone frustum on the convex base plate after dewaxing, and the mould shell can be quickly and accurately installed on the chilling base plate.
3. The blades adopt an inclined die assembly structure, the solidification process of the edge plates is performed in an inclined upward sequence, continuous liquid feeding is obtained, serious loosening of the upper end surfaces of the two edge plates is avoided, and a single crystal guide blade casting with good quality is obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic representation of a prior art guide vane wax pattern tree structure;
FIG. 2 is a schematic view of a guide vane wax pattern tree structure provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a convex quench bottom plate and blade form assembly provided by an embodiment of the present invention;
wherein: 1. a convex chassis; 2. a center pillar; 3. a cross gate; 4. a pouring cup; 5. a first truncated cone; 6. selecting a crystal; 7. a lower flange plate; 8. a leaf body; 9. an upper edge plate; 10. a guide vane form; 11. a convex chilling sole plate; 12. feeding strips; 13. crystal bar leading; 14. upward raising the angle; 15. a down dip angle; 16. a second truncated cone; 17. a planar quench bottom plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 2 and 3, a method of investment casting of a single crystal guide vane comprises:
s1 pressing wax mould
Pressing a blade, a crystal selector 6 and a wax mold of a pouring system, wherein the pouring system comprises a convex chassis 1, a central column 2, a cross gate 3 and a pouring cup 4;
s2 wax model tree
Vertically installing a central column 2 on a first conical frustum 5 in the middle of a convex chassis 1, connecting a cross runner 3 with a sprue cup 4 by using the central column 2, then connecting a cylindrical starting end of a crystal selector 6 with the side surface of the first conical frustum 5, enabling the axial direction of the crystal selector 6 to be vertical to the side surface of the first conical frustum 5, bonding a spiral end of the crystal selector 6 at one corner of the bottom end of a lower edge plate 7 of a blade wax mould, enabling the axial direction of the crystal selector 6 to be parallel to the axial direction of a blade body 8 of the blade wax mould, and connecting the cross runner 3 with one corner of the top end of an upper edge plate 9 of the blade wax mould to form a guide blade wax tree;
s3 preparation of formwork
Coating refractory paint on the wax tree layer by layer, drying and hardening, and then dewaxing and roasting to obtain a guide vane shuttering 10;
s4, smelting and pouring
The smelting and pouring equipment is a vacuum directional solidification furnace, a convex chilling bottom plate 11 of the vacuum directional solidification furnace is consistent with a convex chassis 1 in shape and size, and poured molten metal enters an inner cavity of a formwork through a pouring cup 4 and a cross runner 3 of the formwork and contacts with the side face of a second cone frustum 16 in the middle of the convex chilling bottom plate 11 through a crystal selector 6.
During production, a copper convex chilling bottom plate 11 is arranged on a lifting platform, water is introduced to keep a cooling state, a guide blade mould shell 10 is arranged on the lifting platform, a frustum concave cavity matched with a second frustum cone 16 is formed at the bottom of the guide blade mould shell 10, the mould shell is lifted to a heating chamber, a furnace door is closed, vacuum pumping is carried out, and the mould shell is preheated by electrifying. High-temperature alloy ingots in a crucible above a heating chamber are subjected to induction melting and overheating, the high-temperature alloy ingots are poured into a sprue cup 4 of a formwork, poured molten metal enters an inner cavity of the formwork through the sprue cup 4 and a cross gate 3 of the formwork and is in contact with a convex chilling bottom plate 11 of an oblique conical surface through a crystal selector 6, heat flow Q in the molten metal enters the convex chilling bottom plate 11 along the normal direction of the oblique conical surface, and crystal grains taking the [ 001 ] crystal direction as the priority direction grow upwards in an inclined mode along the direction opposite to the heat flow Q. The single crystal grown in the crystal selector is spread to the whole blade, and the crystal orientation of the single crystal is kept unchanged in the process, namely the axial direction of the blade of the single crystal is parallel to the (001) crystal orientation of the single crystal.
In the embodiment, the convex chilling base plate 11 with the second cone frustum 16 in the middle is used for replacing a common plane chilling base plate 17, and the blades adopt an inclined module structure, so that the sequential solidification of the guide blades is ensured, the generation of mixed crystals at the corners of the edge plate and the generation of looseness on the surface of the edge plate are avoided, and the axial direction and the single crystal of the blades are ensured
【001】 The crystal orientation is consistent, and the requirement on the primary crystal orientation of the single crystal blade is met. In addition, a frustum concave cavity matched with the convex chilling base plate 11 is formed at the bottom of the mould shell, when the mould shell is assembled with the convex chilling base plate 11, the mould shell can be positioned by using a vacant site left by the first frustum cone 5 on the convex base plate 1 after dewaxing, and can be quickly and accurately installed on the convex chilling base plate 11.
In practical application, the axis of the center pillar 2 coincides with the axis of the first cone frustum 5, the inclination beta of the generatrix of the first cone frustum 5 is preferably 45 degrees and can be adjusted within the range of 20 degrees to 70 degrees, the excessively high inclination is not beneficial to the assembly of the blade wax mould, and the excessively low inclination is not compensated for the upper end surface of the wide flange plate, so that the surface looseness can be generated.
In addition, in order to improve production efficiency and reduce production cost, the wax tree comprises a plurality of blade wax moulds which are uniformly distributed around the first cone frustum 5, and each blade wax mould is connected with the side surface of the first cone frustum 5 through a crystal selector 6.
Referring to fig. 2, in some embodiments, during wax pattern assembly, a crystal guiding strip 13 is connected between lower dip angles 15 of upper and lower edge plates of a blade wax pattern, a feeding strip 12 is connected between upper tilt angles 14 of the upper and lower edge plates of the blade wax pattern, a single crystal growing from a crystal selector grows into an oblique lower angle of a lower edge plate 7 of a blade, then a part of the single crystal continues to grow along the lower edge plate 7, a part of the single crystal grows along the crystal guiding strip 13 into an upper edge plate 9, the solidification process of the two edge plates is always carried out obliquely upwards, and the surface of the two edge plates is not loosened because liquid feeding from an oblique upper part is always obtained.
In this embodiment, the lower dip angles 15 of the upper and lower marginal plates of the blade wax pattern are connected with the crystal guiding strip 13, so that the generation of mixed crystals due to supercooling can be effectively avoided, and the feeding strip 12 is connected between the upper tilt angles 14 of the upper and lower marginal plates of the blade wax pattern, so that molten metal feeding from above is obtained during solidification and shrinkage, and the defect of looseness cannot occur.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. An investment precision casting method of a single crystal guide blade is characterized by comprising the following steps:
s1 pressing wax mould
Pressing a blade, a crystal selector (6) and a wax mold of a pouring system, wherein the pouring system comprises a convex chassis (1) with a first cone frustum (5), a middle column (2), a cross gate (3) and a pouring cup (4);
s2 wax model tree
Vertically installing a center post (2) on a first cone frustum (5), connecting a cross runner (3) and a sprue cup (4) by using the center post (2), then connecting the starting end of a crystal selector (6) with the side surface of the first cone frustum (5), enabling the axial direction of the crystal selector (6) to be vertical to the side surface of the first cone frustum (5), bonding the spiral end of the crystal selector (6) at one corner at the bottom end of a lower edge plate (7) of a blade wax mould, enabling the axial direction of the crystal selector (6) to be parallel to the axial direction of a blade body (8) of the blade wax mould, and connecting the cross runner (3) with one corner at the top end of an upper edge plate (9) of the blade wax mould to form a wax tree;
s3 preparation of formwork
Coating refractory paint on the wax tree layer by layer, drying and hardening, dewaxing and roasting to obtain a guide vane mould shell (10);
s4, smelting and pouring
The smelting and pouring equipment is a vacuum directional solidification furnace, a mould shell is placed on a convex chilling bottom plate (11) with the same shape during smelting and pouring, and poured molten metal enters an inner cavity of the mould shell through a pouring cup (4) and a cross gate (3) of the mould shell and contacts with the side face of a second cone frustum (16) in the middle of the convex chilling bottom plate (11) through a crystal selector (6).
2. The investment precision casting method according to claim 1, wherein: when the wax pattern is assembled into a tree, a crystal guiding strip (13) is connected between the lower dip angles (15) of the upper edge plate and the lower edge plate of the blade wax pattern.
3. The investment precision casting method according to claim 1, wherein: when the wax pattern is used for forming a tree, a feeding strip (12) is connected between the upwarping angles (14) of the upper and lower marginal plates of the blade wax pattern.
4. The investment precision casting method according to any one of claims 1 to 3, wherein: the inclination angle of the generatrix of the first cone frustum is 20-70 degrees.
5. The investment precision casting method according to claim 4, wherein: the inclination angle of the first truncated cone generatrix is 45 degrees.
6. The investment precision casting method according to any one of claims 1 to 3, wherein: the axis of the center post (2) coincides with the axis of the first truncated cone (5).
7. The investment precision casting method according to any one of claims 1 to 3, wherein: the wax tree comprises a plurality of blade wax moulds which are uniformly distributed around the first cone frustum (5), and each blade wax mould is connected with the side surface of the first cone frustum (5) through a crystal selector (6).
8. The investment precision casting method according to any one of claims 1 to 3, wherein: the convex chilling bottom plate (11) adopts a copper water-cooling bottom plate.
9. A single crystal guide blade characterized by: produced by the investment precision casting method according to any one of claims 1 to 8.
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| CN202210652031.XA CN115055641B (en) | 2022-06-10 | 2022-06-10 | Single crystal guide vane and investment precision casting method thereof |
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| CN202210652031.XA CN115055641B (en) | 2022-06-10 | 2022-06-10 | Single crystal guide vane and investment precision casting method thereof |
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| CN115055641B CN115055641B (en) | 2023-11-10 |
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| Title |
|---|
| 余柏森: "铝合金高气密性回流导叶的铸造", 航天工艺, no. 03 * |
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| CN115055641B (en) | 2023-11-10 |
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