CN115383056A - Manufacturing process of special-shaped cavity titanium alloy thin-shell casting - Google Patents

Manufacturing process of special-shaped cavity titanium alloy thin-shell casting Download PDF

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Publication number
CN115383056A
CN115383056A CN202211072690.2A CN202211072690A CN115383056A CN 115383056 A CN115383056 A CN 115383056A CN 202211072690 A CN202211072690 A CN 202211072690A CN 115383056 A CN115383056 A CN 115383056A
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Prior art keywords
shell
casting
hole
titanium alloy
manufacturing
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孙冰
杨光
乔海滨
孙宏喆
杨学东
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Luoyang Sunrui Titanium Precision Casting Co Ltd
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Luoyang Sunrui Titanium Precision Casting Co Ltd
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Priority to CN202211072690.2A priority Critical patent/CN115383056A/en
Publication of CN115383056A publication Critical patent/CN115383056A/en
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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
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • B22C13/085—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores by investing a lost pattern
    • 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
    • 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/14—Titanium or alloys thereof

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention provides a manufacturing process of a special-shaped cavity titanium alloy thin-shell casting, which comprises the following steps: s1: modeling by a computer; s2: obtaining a product model; s3: fixing the module; s4: spreading sand and coating slurry; s5: roasting and forming; s6: pouring; s7: cleaning the surface; s8: heat treatment; s9: welding; s10: annealing; the manufacturing process of the special-shaped cavity titanium alloy thin-shell casting does not need a prefabricated core or split preparation in the manufacturing process, simplifies the casting process, improves the reliability and the production efficiency of the casting quality, and reduces the operation difficulty of shell manufacturing and shell cleaning.

Description

Manufacturing process of special-shaped cavity titanium alloy thin-shell casting
Technical Field
The invention relates to the technical field of investment casting, in particular to a manufacturing process of a special-shaped cavity titanium alloy thin shell casting.
Background
A titanium alloy thin-shell casting product with a special-shaped near-closed cavity is a common mechanical part in the fields of automobile and aviation industry, and mainly has the function of reducing weight or improving structural strength. The hollow cavity with the shape like a Chinese character 'hui' can not be normally coated and sanded during shell making by investment casting, and later-period sand removal is also difficult. In the prior art, split casting methods are mostly adopted for investment casting of special-shaped closed or nearly closed cavity parts, and the integrity of a cavity is ensured by welding combination after the respective casting is finished, however, the method needs a large amount of welding, polishing and trimming work, and has the defects of multiple involved procedures, high welding difficulty, large internal stress, easy occurrence of problems of casting deformation, cracks and the like of a welding assembly, and incapability of meeting the product requirements. The other method is that the inner cavity is completely formed by adopting a ceramic core to form a formwork channel, although the method meets the requirement of shell manufacturing, when the inner cavity is abnormal, bent or overlong and is nearly closed, the cast product has the problems that the core can not be taken off or the inner cavity is stuck, and the like, and the casting cost and the rejection rate are increased.
The patent application with the patent number of CN112122545B and the name of 'a preparation method of a reusable investment casting shell, a shell and a casting process' discloses that an investment mould is adhered to a bottom plate, a rigid cylinder is sleeved outside the investment mould, refractory slurry is injected into a cavity between the rigid cylinder and the investment mould, an upper opening of the rigid cylinder is sealed by a top plate, steam is used for steam pressing, and roasting is carried out after steam pressing to obtain a finished product of the investment casting shell.
Disclosure of Invention
In view of this, the invention aims to provide a manufacturing process of a special-shaped cavity thin-shell casting to solve the problems of troublesome manufacturing and high cost of the special-shaped cavity casting in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a manufacturing process of a titanium alloy thin-shell casting with a special-shaped cavity comprises the following steps:
s1: computer modeling, namely establishing a three-dimensional model of the casting through a computer according to design parameters of the casting to be manufactured;
s2: obtaining a product model, and obtaining the product model according to the three-dimensional model of the casting by adopting 3D printing;
s3: fixing a module, and adhering the product model and the investment pattern group of the process hole sealing sheet to a pouring system;
s4: spreading sand and coating slurry, namely coating slurry and spreading sand on the fired mold group from inside to outside;
s5: roasting and forming, namely roasting the investment pattern group at high temperature to obtain a shell finished product with certain strength;
s6: pouring, namely pouring the smelted liquid titanium alloy into the shell, and obtaining a cavity thin shell casting with a fabrication hole and a fabrication hole sealing sheet after the liquid titanium alloy is condensed;
s7: surface cleaning, namely performing shell cleaning and sand blasting treatment on the poured titanium alloy casting;
s8: performing heat treatment, namely performing heat treatment strengthening on the titanium alloy casting subjected to shell cleaning and sand blasting;
s9: welding, namely welding the fabrication hole sealing sheet on the fabrication hole of the titanium alloy casting;
s10: and annealing, and performing stress relief annealing on the titanium alloy casting.
The step S1 further includes:
a. designing a shell manufacturing hole and a shell cleaning hole in an internal cavity of the three-dimensional model;
b. designing a pouring system of the titanium alloy casting;
in step S2, the 3D printing includes fused deposition modeling, stereolithography, selective laser sintering, and the like.
In step S3, the investment set is bonded to the gating system by wax welding.
In step S7, a mechanical rod is inserted into the casting from the shell cleaning hole to clean the mould shell ash in the casting.
In step S9, after the fabrication hole sealing sheet is welded to the titanium alloy casting, the welded portion needs to be polished and trimmed to make the surface roughness and size meet the design specifications.
The manufacturing process of the special-shaped cavity titanium alloy thin-shell casting does not need a prefabricated core or split preparation in the manufacturing process, simplifies the casting process, improves the reliability and the production efficiency of the casting quality, and reduces the operation difficulty of shell manufacturing and shell cleaning.
Further, in the step S1, a shell making hole, a shell cleaning hole and a flange are formed in the three-dimensional model, the shell making hole is formed in a position, opposite to the flange end, of the square-shaped curved surface cavity of the casting, the shell making hole is used for spraying refractory sand, the shell cleaning hole is formed in the outer walls of the left side and the right side of the square-shaped curved surface cavity, and the shell cleaning hole is used for cleaning shell ash.
Make the shell hole convenient when making the shell in earlier stage to the inside processing of spilling sand of mould, clear shell hole can be when making the shell in earlier stage to the inside processing of spilling sand of mould, can clear away the mould shell ash when shelling again.
Furthermore, the shell manufacturing holes comprise a first shell manufacturing hole and a second shell manufacturing hole, the flanges comprise a first flange and a second flange, and the first shell manufacturing hole and the second shell manufacturing hole are symmetrical relative to the central line of the horizontal connecting line of the first flange and the second flange.
The structure is convenient for uniformly blasting sand into the cavity of the square-shaped curved surface, and dead angles are avoided.
Further, the shell cleaning holes comprise a first shell cleaning hole, a second shell cleaning hole, a third shell cleaning hole and a fourth shell cleaning hole, the first shell cleaning hole and the third shell cleaning hole are symmetrical relative to a central line of a horizontal connecting line of the first flange and the second flange, and the second shell cleaning hole and the fourth shell cleaning hole are symmetrical relative to a central line of a horizontal connecting line of the first flange and the second flange.
The structure makes the operation of sand blasting and shelling more convenient.
Further, a radial third site and a radial fourth site of the shell inner cavity can be visually detected through the first shell cleaning hole and the third shell cleaning hole, and a radial first site and a radial second site of the shell inner cavity can be visually detected through the second shell cleaning hole and the fourth shell cleaning hole.
The structure enables the mechanical rod to pass through the shell cleaning hole to clean any position of the inner cavity of the shell, and thus, the ash of the shell can be conveniently removed during shell removal.
Further, in the step S4, the melting module performs sand spreading and grouting on a surface layer, a transition layer and a back layer from inside to outside, sand spreading is performed on the inner cavity of the model through the shell making hole and the shell cleaning hole, the surface layer and the transition layer are arranged into five layers, and after sand spreading of the surface layer and the transition layer is completed, sand spreading and grouting are performed after the shell making hole and the shell cleaning hole are plugged.
Because the wall of the cavity is thin, the sanding and grouting mode ensures that the thickness of the inner cavity shell can meet the strength, reduces the material and labor input, and reduces the sand cleaning difficulty of the later-stage hollow-curved-surface inner cavity.
Further, in the step S6, the titanium alloy casting adopts a top-pouring shower type pouring system.
The pouring mode can enhance the compactness of the casting and reduce the shrinkage porosity of the inner part on one hand, has good filling property on the other hand, can reduce the repair welding part and the repair welding amount of the casting, and is particularly suitable for complex thin shell parts.
Further, in the step S8, the titanium alloy casting and the process hole sealing sheet are subjected to heat treatment in the same furnace after being formed, wherein the heat treatment temperature is 890-950 ℃, and the heat preservation time is 1-2.5 h.
The titanium alloy casting and the fabrication hole sealing sheet can obviously improve the strength of the titanium alloy through the heat treatment.
Further, in the step S9, the process hole sealing piece after the heat treatment is polished and cleaned, and the process hole sealing piece and the process hole are subjected to fusion welding by using a TIG welding process.
The sealing piece of the fabrication hole is polished and cleaned, so that impurities on the surface of the sealing piece can be removed, the roughness of the surface of the sealing piece is reduced, and the welding operation is facilitated.
Furthermore, a WS-400 argon arc welding machine is adopted, the purity of argon is more than 99.99 percent, the argon is ventilated according to the specified time before welding, the front surface and the back surface are protected by argon through supporting covers during welding, the diameter of the tungsten electrode is phi 3mm, the welding current is 50A-85A, and the argon flow is 16-20L/min.
The welding mode in this application easy operation, welding speed is fast, and the heat affected zone is little, and the work piece warp when welding for a short time, is convenient for realize the automatic welding in full position, and the welding seam is fine and close, and the shaping is pleasing to the eye, and welding quality is good, especially is adapted to the sheet metal welding.
Further, in the step S10, the welded titanium alloy casting is annealed in the furnace at the annealing temperature of 550-650 ℃ for 1-2.5 h.
The titanium alloy casting can reduce the residual stress generated in the casting and welding process through annealing, avoid the deformation of the casting and simultaneously enhance the corrosion resistance of the casting.
Compared with the prior art, the manufacturing process of the special-shaped cavity titanium alloy thin-shell casting has the following advantages:
1) The manufacturing process is simple, the integrated molding of the casting is realized, the profile degree of the closed square-shaped arc-surface cavity is effectively ensured, the stability and the reliability of the production quality of the casting are improved, and the manufacturing efficiency of the casting is improved;
2) The manufacturing process reduces the operation difficulty of shell manufacturing and shell cleaning, and ensures the shell manufacturing quality and the shell cleaning effect of the product.
Drawings
FIG. 1 is a schematic view of a casting form according to an embodiment of the invention from a first perspective;
FIG. 2 is a second perspective view of a casting form of the present invention.
Description of the reference numerals:
1. preparing a shell hole; 11. a first shell making hole; 12. a second shell making hole; 2. cleaning the shell holes; 21. a first shell cleaning hole; 22. a second shell cleaning hole; 23. a third hull clearing hole; 24. a fourth hull clearing aperture; 3. a flange; 31. a first flange; 32. a second flange; 41. a first site; 42. a second site; 43. a third site; 44. a fourth site; 100. a cavity with a curved surface in a shape of a Chinese character 'hui'.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
As shown in fig. 1-2, a manufacturing process of a titanium alloy thin-shell casting with a special-shaped cavity comprises the following steps:
s1: computer modeling, namely establishing a three-dimensional model of the casting through a computer according to design parameters of the casting to be manufactured;
s2: obtaining a product model, and obtaining the product model according to the three-dimensional model of the casting by adopting 3D printing;
s3: fixing a module, and adhering the product model and the investment pattern group of the process hole sealing sheet to a pouring system;
s4: spreading sand and coating slurry, namely coating slurry and spreading sand on the fired mold group from inside to outside;
s5: roasting and molding, namely roasting the investment pattern group at high temperature to prepare a shell finished product with certain strength;
s6: pouring, namely pouring the smelted liquid titanium alloy into the shell, and condensing the liquid titanium alloy to obtain a cavity thin shell casting with a fabrication hole and a fabrication hole sealing piece;
s7: surface cleaning, namely performing shell cleaning and sand blasting treatment on the poured titanium alloy casting;
s8: performing heat treatment, namely performing heat treatment strengthening on the titanium alloy casting subjected to shell cleaning and sand blasting;
s9: welding, namely welding the fabrication hole sealing sheet to the fabrication hole of the titanium alloy casting;
s10: and annealing, namely performing stress relief annealing on the titanium alloy casting.
The step S1 further includes:
a. designing a shell manufacturing hole 1 and a shell cleaning hole 2 in an internal cavity of the three-dimensional model;
b. designing a pouring system of the titanium alloy casting;
in step S2, the 3D printing includes fused deposition modeling, stereolithography, selective laser sintering, and the like.
In step S3, the investment set is bonded to the gating system by wax welding.
In step S7, a mechanical rod is inserted into the casting from the shell cleaning hole 2 to clean the mould shell ash in the casting.
In step S9, after the fabrication hole sealing sheet is welded to the titanium alloy casting, the welded portion needs to be polished and trimmed to make the surface roughness and size meet the design specifications.
According to the manufacturing process of the titanium alloy thin-shell casting with the special-shaped cavity, the shell manufacturing hole 1 and the shell cleaning hole 2 are formed in the mold, so that sand spraying treatment is conveniently performed on the interior of the mold during early shell manufacturing, and mold shell ash is conveniently removed during shell removal.
The manufacturing process does not need to prefabricate a mold core in the manufacturing process and split preparation, simplifies the casting process, improves the reliability and the production efficiency of the casting quality, and reduces the operation difficulty of shell manufacturing and shell cleaning.
As a preferred example of the present invention, in the step S1, a shell making hole 1, a shell cleaning hole 2 and a flange 3 are provided on the three-dimensional model, the shell making hole 1 is provided at a position of the square-shaped curved surface cavity 100 of the casting opposite to the flange 3 end, the shell making hole 1 is used for spraying refractory sand, the shell cleaning hole 2 is provided on the left and right outer walls of the square-shaped curved surface cavity 100, and the shell cleaning hole 2 is used for cleaning shell ash.
Specifically, the shell manufacturing hole 1 is a circular hole, the diameter of the circular hole is more than 25mm and more than D and more than 20mm, the shell cleaning hole 2 is an elliptical hole, the major axis of the elliptical hole is more than 35mm and more than X and more than 30mm, and the minor axis of the elliptical hole is more than 25mm and more than Y and more than 20mm.
Make shell hole 1 convenient earlier stage and carry out the sanding processing to the model inside when making the shell, clear shell hole 2 can be when making the shell to the inside sanding processing of model, can clear away the mould shell ash when shelling again.
As a preferred example of the present invention, the housing hole 1 includes a first housing hole 11 and a second housing hole 12, the flange 3 includes a first flange 31 and a second flange 32, and the first housing hole 11 and the second housing hole 12 are symmetrical with respect to a center line of a horizontal connecting line of the first flange 31 and the second flange 32.
Specifically, the structure facilitates uniform sand blasting into the square-shaped curved surface cavity 100, and avoids dead angles.
As a preferred example of the present invention, shell cleaning hole 2 includes first shell cleaning hole 21, second shell cleaning hole 22, third shell cleaning hole 23 and fourth shell cleaning hole 24, where first shell cleaning hole 21 and third shell cleaning hole 23 are symmetrical with respect to a center line of a horizontal connecting line of first flange 31 and second flange 32, and second shell cleaning hole 22 and fourth shell cleaning hole 24 are symmetrical with respect to a center line of a horizontal connecting line of first flange 31 and second flange 32.
In particular, the structure facilitates the operation of sand blasting and shelling.
As a preferred example of the present invention, the third radial position 43 and the fourth radial position 44 of the shell inner cavity can be visually detected through the first shell cleaning hole 21 and the third shell cleaning hole 23, and the first radial position 41 and the second radial position 42 of the shell inner cavity can be visually detected through the second shell cleaning hole 22 and the fourth shell cleaning hole 24.
Specifically, the structure enables the mechanical rod to clean any position of the inner cavity of the shell through the shell cleaning hole 2, so that the ash of the shell can be conveniently removed during shelling.
As a preferred example of the present invention, in the step S4, the melting module is subjected to sand spraying and grouting on the surface layer, the transition layer and the back layer from inside to outside, the inner cavity of the mold is subjected to sand spraying through the shell making holes 1 and the shell cleaning holes 2, the surface layer and the transition layer are arranged into five layers, and after the sand spraying of the surface layer and the transition layer is completed, the shell making holes 1 and the shell cleaning holes 2 are blocked, and then sand spraying and grouting are performed.
The model surface is pressed close to the surface course, and its molding sand is more exquisite, the texture of the shell of being convenient for duplicate, and the model surface is kept away from to the backing layer, and its molding sand is coarser, and the gas permeability is good, and intensity is high, for the shell provides the support, is the transition layer between surface course and the backing layer, plays the joint support effect.
Because the wall of the cavity is thin, the sand spreading and grouting mode ensures that the thickness of the inner cavity shell can meet the strength, and can reduce the input of materials and labor, and simultaneously reduce the sand removing difficulty of the later-stage hollow square curved surface inner cavity.
As a preferred example of the present invention, in step S6, the titanium alloy casting adopts a top-pouring shower-type gating system.
Specifically, the pouring mode can enhance the compactness of the casting and reduce the shrinkage porosity of the inner part on one hand, has good filling property on the other hand, can reduce the repair welding part and the repair welding amount of the casting, and is particularly suitable for complex thin shell parts.
As a preferable example of the invention, in the step S8, the titanium alloy casting and the process hole sealing sheet are subjected to heat treatment in a furnace after being formed, the heat treatment temperature is 890-950 ℃, and the holding time is 1-2.5 h.
Specifically, the titanium alloy casting and the fabrication hole sealing sheet can obviously improve the strength of the titanium alloy through the heat treatment.
As a preferred example of the present invention, in step S9, the process hole sealing piece after the heat treatment is polished and cleaned, and the process hole sealing piece and the process hole are fusion welded by using a TIG welding process.
Specifically, the sealing piece of the fabrication hole is polished and cleaned, so that impurities on the surface of the sealing piece can be removed, the surface roughness of the sealing piece is reduced, and the welding operation is facilitated.
As a preferred example of the invention, a WS-400 argon arc welding machine is adopted, a cerium tungsten electrode is adopted, the purity of argon is more than 99.99 percent, the ventilation is carried out according to the specified time before the welding, the front surface and the back surface are protected by argon through a supporting cover during the welding, the diameter of the tungsten electrode is phi 3mm, the welding current is 50A-85A, and the argon flow is 16-20L/min.
Particularly, the welding mode in the application is simple to operate, the welding speed is high, the heat affected zone is small, the deformation of the workpiece during welding is small, the full-position automatic welding is convenient to realize, the welding line is compact, the forming is attractive, the welding quality is good, and the welding method is particularly suitable for thin plate welding.
As a preferable example of the invention, in the step S10, the welded titanium alloy casting is annealed in a furnace, the annealing temperature is 550-650 ℃, and the holding time is 1-2.5 h.
Specifically, the titanium alloy casting can reduce the residual stress generated in the casting and welding processes through annealing, so that the deformation of the casting is avoided, and meanwhile, the corrosion resistance of the casting can be enhanced.
In conclusion, the manufacturing process of the titanium alloy thin-shell casting with the special-shaped cavity is simple in manufacturing process, the integral molding of the casting is realized, the profile degree of the closed square-arc-surface cavity is effectively ensured, the stability and reliability of the production quality of the casting are improved, the manufacturing efficiency of the casting is improved, in addition, the manufacturing process reduces the operation difficulty of shell manufacturing and shell cleaning, and the shell manufacturing quality and the shell cleaning effect of the product are ensured.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A manufacturing process of a special-shaped cavity titanium alloy thin-shell casting is characterized by comprising the following steps:
s1: computer modeling, namely establishing a three-dimensional model of the casting through a computer according to design parameters of the casting to be manufactured;
s2: obtaining a product model, and obtaining the product model according to the three-dimensional model of the casting by adopting 3D printing;
s3: fixing a module, and adhering the product model and the investment pattern group of the process hole sealing sheet to a pouring system;
s4: spreading sand and coating slurry, namely coating slurry and spreading sand on the fired mold group from inside to outside;
s5: roasting and molding, namely roasting the investment pattern group at high temperature to prepare a shell finished product with certain strength;
s6: pouring, namely pouring the smelted liquid titanium alloy into the shell, and condensing the liquid titanium alloy to obtain a cavity thin shell casting with a fabrication hole and a fabrication hole sealing piece;
s7: surface cleaning, namely performing shell cleaning and sand blasting treatment on the poured titanium alloy casting;
s8: performing heat treatment, namely performing heat treatment strengthening on the titanium alloy casting subjected to shell cleaning and sand blasting;
s9: welding, namely welding the fabrication hole sealing sheet on the fabrication hole of the titanium alloy casting;
s10: and annealing, and performing stress relief annealing on the titanium alloy casting.
2. The manufacturing process of the titanium alloy thin-shell casting with the special-shaped cavity is characterized in that in the step S1, a shell manufacturing hole (1), a shell cleaning hole (2) and a flange (3) are formed in the three-dimensional model, the shell manufacturing hole (1) is formed in the position, opposite to the flange (3), of the square-curved cavity (100) of the casting, the shell manufacturing hole (1) is used for spraying refractory sand, the shell cleaning hole (2) is formed in the outer walls of the left side and the right side of the square-curved cavity (100), and the shell cleaning hole (2) is used for removing shell ash.
3. A process for manufacturing a thin shell casting of a titanium alloy with a shaped cavity according to claim 2, wherein the shell manufacturing holes (1) comprise a first shell manufacturing hole (11) and a second shell manufacturing hole (12), the flange (3) comprises a first flange (31) and a second flange (32), and the first shell manufacturing hole (11) and the second shell manufacturing hole (12) are symmetrical relative to a central line of a horizontal connecting line of the first flange (31) and the second flange (32).
4. A manufacturing process of a titanium alloy thin shell casting with a special-shaped cavity as claimed in claim 3, wherein the shell cleaning holes (2) comprise a first shell cleaning hole (21), a second shell cleaning hole (22), a third shell cleaning hole (23) and a fourth shell cleaning hole (24), the first shell cleaning hole (21) and the third shell cleaning hole (23) are symmetrical relative to a central line of a horizontal connecting line of the first flange (31) and the second flange (32), and the second shell cleaning hole (22) and the fourth shell cleaning hole (24) are symmetrical relative to a central line of a horizontal connecting line of the first flange (31) and the second flange (32).
5. The manufacturing process of the thin shell casting made of the titanium alloy with the special-shaped cavity is characterized in that a radial third position (43) and a radial fourth position (44) of the shell cavity can be visually observed through the first shell cleaning hole (21) and the third shell cleaning hole (23), and a radial first position (41) and a radial second position (42) of the shell cavity can be visually observed through the second shell cleaning hole (22) and the fourth shell cleaning hole (24).
6. The manufacturing process of the titanium alloy thin-shell casting with the special-shaped cavity according to claim 5, wherein in the step S4, the melting die set is used for sanding and grouting a surface layer, a transition layer and a back layer from inside to outside, the inner cavity of the die is sanded through the shell manufacturing holes (1) and the shell cleaning holes (2), the surface layer and the transition layer are arranged into five layers, and after sanding of the surface layer and the transition layer is completed, sanding and grouting are carried out after the shell manufacturing holes (1) and the shell cleaning holes (2) are blocked.
7. The manufacturing process of the special-shaped cavity titanium alloy thin-shell casting according to claim 1, wherein in the step S8, the titanium alloy casting and the process hole sealing piece are subjected to heat treatment in the same furnace after being formed, the heat treatment temperature is 890-950 ℃, and the heat preservation time is 1-2.5 h.
8. The manufacturing process of the special-shaped cavity titanium alloy thin shell casting according to claim 1, wherein in the step S9, the process hole sealing piece after heat treatment is polished and cleaned, and the process hole sealing piece and the process hole are subjected to deposition welding by a TIG welding process.
9. The manufacturing process of the titanium alloy thin-shell casting with the special-shaped cavity according to claim 8 is characterized in that a WS-400 argon arc welding machine is adopted, a cerium tungsten electrode is adopted, the argon purity is higher than 99.99%, ventilation is needed before welding, argon protection is carried out on the front surface and the back surface by a support cover during welding, the diameter of the tungsten electrode is phi 3mm, the welding current is 50A-85A, and the argon flow is 16-20L/min.
10. The manufacturing process of the special-shaped cavity titanium alloy thin-shell casting according to claim 1, wherein in the step S10, the welded titanium alloy casting is subjected to stress relief annealing in a furnace, the annealing temperature is 550-650 ℃, and the holding time is 1-2.5 hours.
CN202211072690.2A 2022-09-02 2022-09-02 Manufacturing process of special-shaped cavity titanium alloy thin-shell casting Pending CN115383056A (en)

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