CN116586562A - Titanium alloy casting with long and narrow pipeline structure and preparation method and application thereof - Google Patents
Titanium alloy casting with long and narrow pipeline structure and preparation method and application thereof Download PDFInfo
- Publication number
- CN116586562A CN116586562A CN202310347362.7A CN202310347362A CN116586562A CN 116586562 A CN116586562 A CN 116586562A CN 202310347362 A CN202310347362 A CN 202310347362A CN 116586562 A CN116586562 A CN 116586562A
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- China
- Prior art keywords
- titanium alloy
- alloy casting
- shell
- diameter
- graphite tube
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- 238000005266 casting Methods 0.000 title claims abstract description 61
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 46
- 239000010439 graphite Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000005495 investment casting Methods 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a titanium alloy casting with a long and narrow pipeline structure, and a preparation method and application thereof, wherein through holes are formed on a manufactured shell at positions corresponding to two ends of the long and narrow pipeline structure; then, the graphite tube penetrates through two corresponding through holes in the shell, and two ends of the graphite tube are exposed; and pouring the shell, and removing the graphite tube after pouring and forming to obtain the titanium alloy casting with the long and narrow pipeline structure. The preparation method can effectively reduce the breakage of the ceramic core in the processes of wax mould and coating, and the cleaning difficulty after casting is greatly lower than that of the ceramic core for insert casting.
Description
Technical Field
The invention relates to the technical field of titanium alloy investment casting, in particular to a titanium alloy casting with a long and narrow pipeline structure, and a preparation method and application thereof.
Background
The titanium alloy casting structure of the aeroengine is multi-cavity, the long and narrow pipeline is one of the structures, and the long and narrow pipeline structure has high realization difficulty of natural paint and high forming difficulty in titanium alloy investment casting.
At present, an insert casting ceramic core is generally adopted to form an elongated pipeline structure, but the ceramic core is easy to break in the coating process, the ceramic core is difficult to clean after casting, and the casting body is easy to be damaged.
Therefore, it is necessary to develop a completely new method of forming the elongated piping structure of the titanium alloy investment casting process.
Disclosure of Invention
Aiming at the problems in the prior art, the main purpose of the invention is to provide a titanium alloy casting with a long and narrow pipeline structure, and a preparation method and application thereof.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a method for producing a titanium alloy casting having an elongated piping structure.
The preparation method of the titanium alloy casting with the long and narrow pipeline structure comprises the following steps:
providing a titanium alloy casting wax pattern with an elongated pipeline structure;
filling wax into the long and narrow pipeline structure along the axis direction to form a wax rod, wherein both ends of the wax rod are exposed;
manufacturing a shell, wherein through holes are formed in positions, corresponding to two ends of the long and narrow pipeline structure, on the shell;
a graphite tube penetrates through the two corresponding through holes in the shell, and two ends of the graphite tube are exposed;
and (3) pouring the shell by adopting a pouring process, and removing the graphite tube after pouring and forming to prepare the titanium alloy casting with the long and narrow pipeline structure.
Further, the manufacturing of the shell comprises the following steps:
adopting a coating sand-hanging process to prepare a shell wrapped on the outer side of the titanium alloy casting wax mould; wherein both ends of the wax stick are exposed;
dewaxing and roasting to obtain the shell.
Further, the diameter of the exposed portion of the wax rod is 0.5mm greater than the diameter of the elongate conduit structure; the length of the exposed part of the wax rod is more than or equal to 30mm.
Further, the diameter of the through hole is the same as the diameter of the exposed part of the wax rod.
Further, titanium wires are adopted for guiding so as to penetrate the graphite tube through two corresponding through holes in the shell.
Further, the outer diameter of the graphite tube is 7-12 mm; the length of the exposed part of the graphite tube is more than or equal to 30mm.
Further, the diameter of the titanium wire is 1/3 of the diameter of the through hole;
preferably, the length of the titanium wire is equal to or more than the length of the graphite tube, and the diameter of the titanium wire is smaller than the inner diameter of the graphite tube.
Further, the connection part of the graphite tube and the shell is fastened by adopting a rapid coating process.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a titanium alloy casting having an elongated piping structure.
The titanium alloy casting with the long and narrow pipeline structure is prepared by adopting the preparation method; wherein,,
the diameter of the long and narrow pipeline structure is 7-12 mm, and the length is 200-350 mm.
In order to achieve the above object, according to a third aspect of the present invention, there is provided the use of a titanium alloy casting having an elongated piping structure.
The titanium alloy casting with the long and narrow pipeline structure prepared by the preparation method is applied to an aeroengine.
The invention provides a brand new method for forming a long and narrow pipeline structure of a titanium alloy investment casting process, which comprises the steps of firstly forming through holes on a shell at positions corresponding to two ends of the long and narrow pipeline structure, then penetrating through two corresponding through holes on the shell by utilizing a graphite pipe, then casting the shell by adopting a casting process, removing the graphite pipe after casting and forming, and obtaining a titanium alloy casting with the long and narrow pipeline structure, wherein the cracking of a ceramic core in the processes of a wax mold and a coating can be effectively reduced, and the cleaning difficulty after casting is greatly lower than that of an inlaid ceramic core.
The invention has the advantages that:
1. the compressive strength of the high-purity graphite is generally 45-80 Mpa, and the compressive strength of the ceramic material is generally more than 200Mpa, so that the cleaning difficulty of the graphite is easier than that of the ceramic.
2. Graphite is easily oxidized in the atmosphere and in a high-temperature environment. The invention adopts the method that the graphite tube is arranged after the shell is baked and formed, so that the oxidation of graphite in the atmospheric environment and the baking process is avoided.
3. The casting is formed by vacuum smelting and pouring, and the long and narrow hole structure is formed after the graphite is cleaned by utilizing the characteristics of low compression strength and low cleaning difficulty of the graphite.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic cross-sectional view of a titanium alloy casting wax pattern with an elongated piping structure in accordance with an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along the direction A-A in FIG. 1;
FIG. 3 is a schematic cross-sectional view of a titanium alloy casting wax pattern after formation of a wax stick in accordance with an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a titanium alloy casting with graphite tubes after pour forming in accordance with an embodiment of the present invention;
fig. 5 is an enlarged view of the structure of the K portion in fig. 4.
In the figure:
1. an elongated conduit structure; 2. a titanium alloy casting wax pattern; 3. a wax stick; 4. a graphite tube;
5. titanium wires; 6. and (3) titanium alloy castings.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention provides a brand new preparation method for developing a titanium alloy casting with a long and narrow pipeline structure by adopting an investment casting process.
The preparation method of the titanium alloy casting with the long and narrow pipeline structure specifically comprises the following steps:
1) A titanium alloy casting wax pattern 2 is provided, as shown in fig. 1-2, the titanium alloy casting wax pattern 2 having an elongated piping structure 1.
In an embodiment of the invention, the diameter of the elongated tubular structure 1 is in the range of 7-12 mm and the length is in the range of 200-350 mm.
As some embodiments of the invention, the elongated tubular structure 1 has a diameter of 7mm and a length of 300mm.
2) The long and narrow pipeline structure 1 is filled with wax along the axis direction to form a wax rod 3, and both ends of the wax rod 3 are exposed, as shown in fig. 3.
In the embodiment of the present invention, the elongated piping structure 1 is filled with wax to form a wax rod 3 of a solid structure, and the diameter of the exposed portion of the wax rod 3 > the diameter of the elongated piping structure 1.
As some embodiments of the invention, the exposed portion of the wax rod 3 has a diameter that is 0.5mm greater than the diameter of the elongate channel structure 1.
As some embodiments of the invention, the length of the exposed portion of the wax stick 3 is greater than or equal to 30mm.
Of course, the diameter of the exposed part of the wax rod 3 and the length of the exposed part can be adjusted according to the actual operation requirement so as to meet the actual production requirement.
3) Adopting a coating sand-coating process to prepare a shell coated on the outer side of the titanium alloy casting wax mould 1; wherein both ends of the wax stick 3 are exposed.
It is mentioned that during the process of manufacturing, each layer of coating is used for protecting the exposed part of the wax rod 3, and during drying, the protection measures are removed, and the steps are repeated in this way, so that the shell which is wrapped on the outer side of the titanium alloy casting wax mould 1 and exposes the two ends of the wax rod 3 is finally manufactured.
4) Dewaxing and roasting to obtain a shell, and forming through holes on the shell at positions corresponding to the two ends of the long and narrow pipeline structure 1. Wherein the diameter of the through hole is the same as the diameter of the exposed portion of the wax rod 3.
In the embodiment of the invention, after roasting and dewaxing, the wax rods 3 with two exposed ends, namely the exposed parts of the wax rods 3, are liquefied and flow out, and through holes are respectively formed in the positions, corresponding to the two ends of the long and narrow pipeline, on the shell, for example, through holes with the diameters of 7.5mm are respectively formed.
It is worth mentioning that in the embodiments of the present invention, electro dewaxing may be used, the dewaxing temperature is 300-400 ℃, and the dewaxing time is not less than 2.0h; roasting at a temperature above 1000 ℃ for a high-temperature roasting time not less than 4 hours.
5) The graphite tube 4 is used for penetrating through two corresponding through holes on the shell, and two ends of the graphite tube 4 are exposed.
In the embodiment of the present invention, the titanium wire 5 may be used to guide the graphite tube 4 through two corresponding through holes on the shell, that is, the graphite tube 4 is inserted from one through hole on the shell and is inserted from the other through hole corresponding to the through hole, and both ends of the graphite tube 4 are exposed.
As some embodiments of the invention, the length of the exposed portion of the graphite tube 4 is 30mm or more.
In the embodiment of the present invention, the outer diameter of the graphite tube 4 is in the range of 7 to 12 mm.
In the embodiment of the invention, the diameter of the titanium wire 5 is 1/3 of the diameter of the through hole.
In the embodiment of the invention, the length of the titanium wire 5 is equal to or longer than the length of the graphite tube 4, and the diameter of the titanium wire 5 is smaller than the inner diameter of the graphite tube 4.
As some embodiments of the invention, the titanium wire 5 has a diameter of 2.5mm and a length of 400mm.
It should be noted that, in the present invention, after the graphite tube 4 penetrates through the two corresponding through holes on the shell, in order to improve the firmness of the graphite tube 4, a rapid coating process may be used to fix the two ends of the graphite tube 4, so as to fasten the connection between the graphite tube 4 and the shell.
6) The casting process, such as a static casting process, is adopted to cast the shell, the structure after casting forming is shown in fig. 4-5, and then the graphite tube 4 can be vibrated to be crushed and cleaned by vibration, so that the titanium alloy casting 6 with the long and narrow pipeline structure is finally manufactured.
It should be noted that, the rapid coating process and the static casting process in the invention are conventional production processes in the prior art, and the process parameters thereof can be designed according to actual needs, and are not repeated.
According to an embodiment of the invention, the invention also provides a titanium alloy casting with an elongated pipeline structure.
The titanium alloy casting with the long and narrow pipeline structure is prepared by adopting the preparation method. Wherein, the diameter of the long and narrow pipeline structure in the titanium alloy casting is 7-12 mm, and the length is 200-350 mm.
According to the specific embodiment of the invention, the titanium alloy casting with the long and narrow pipeline structure prepared by the preparation method can be applied to an aeroengine to be used as the titanium alloy casting of the aeroengine.
It should be noted that the term "comprising" in the description of the invention and in the claims, as well as any variants thereof, is intended to cover a non-exclusive inclusion, for example, comprising a series of elements not necessarily limited to those elements explicitly listed, but may include other elements not explicitly listed or inherent to elements.
In the present invention, the terms "upper", "lower", "bottom", "top", "left", "right", "inner", "outer", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The preparation method of the titanium alloy casting with the long and narrow pipeline structure is characterized by comprising the following steps of:
providing a titanium alloy casting wax pattern with an elongated pipeline structure;
filling wax into the long and narrow pipeline structure along the axis direction to form a wax rod, wherein both ends of the wax rod are exposed;
manufacturing a shell, wherein through holes are formed in positions, corresponding to two ends of the long and narrow pipeline structure, on the shell;
a graphite tube penetrates through the two corresponding through holes in the shell, and two ends of the graphite tube are exposed;
and (3) pouring the shell by adopting a pouring process, and removing the graphite tube after pouring and forming to prepare the titanium alloy casting with the long and narrow pipeline structure.
2. The method of producing a titanium alloy casting having an elongated piping structure according to claim 1, wherein the step of producing the shell comprises the steps of:
adopting a coating sand-hanging process to prepare a shell wrapped on the outer side of the titanium alloy casting wax mould; wherein both ends of the wax stick are exposed;
dewaxing and roasting to obtain the shell.
3. The method of preparing a titanium alloy casting having an elongated tubular structure according to claim 1, wherein the diameter of the exposed portion of the wax rod is 0.5mm greater than the diameter of the elongated tubular structure; the length of the exposed part of the wax rod is more than or equal to 30mm.
4. A method of producing a titanium alloy casting having an elongated piping structure according to claim 1 or 3, wherein the diameter of said through hole is the same as the diameter of the exposed portion of said wax rod.
5. A method of producing a titanium alloy casting having an elongated piping structure according to claim 1, wherein titanium wire is used for guiding said graphite tube through corresponding two of said through holes in said shell.
6. The method for producing a titanium alloy casting having an elongated piping structure according to claim 1 or 5, wherein the graphite tube has an outer diameter of 7 to 12mm; the length of the exposed part of the graphite tube is more than or equal to 30mm.
7. The method for producing a titanium alloy casting having an elongated piping structure according to claim 5, wherein the diameter of the titanium wire is 1/3 of the diameter of the through hole;
preferably, the length of the titanium wire is equal to or more than the length of the graphite tube, and the diameter of the titanium wire is smaller than the inner diameter of the graphite tube.
8. The method of producing a titanium alloy casting having an elongated piping structure according to claim 1, wherein said graphite tube is fastened to said shell at the junction thereof by a rapid coating process.
9. A titanium alloy casting having an elongated piping structure, characterized in that it is produced by the production method according to any one of claims 1 to 8; wherein,,
the diameter of the long and narrow pipeline structure is 7-12 mm, and the length is 200-350 mm.
10. Use of a titanium alloy casting with an elongated tubular structure, produced by the production method according to any one of claims 1-8, in an aeroengine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310347362.7A CN116586562A (en) | 2023-04-03 | 2023-04-03 | Titanium alloy casting with long and narrow pipeline structure and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310347362.7A CN116586562A (en) | 2023-04-03 | 2023-04-03 | Titanium alloy casting with long and narrow pipeline structure and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116586562A true CN116586562A (en) | 2023-08-15 |
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ID=87599763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310347362.7A Pending CN116586562A (en) | 2023-04-03 | 2023-04-03 | Titanium alloy casting with long and narrow pipeline structure and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116586562A (en) |
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2023
- 2023-04-03 CN CN202310347362.7A patent/CN116586562A/en active Pending
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