CN114535504B - Titanium alloy casting, shell and shell preparation method - Google Patents
Titanium alloy casting, shell and shell preparation method Download PDFInfo
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- CN114535504B CN114535504B CN202210157629.1A CN202210157629A CN114535504B CN 114535504 B CN114535504 B CN 114535504B CN 202210157629 A CN202210157629 A CN 202210157629A CN 114535504 B CN114535504 B CN 114535504B
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- 238000005266 casting Methods 0.000 title claims abstract description 93
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 230000002285 radioactive effect Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 8
- 238000005495 investment casting Methods 0.000 abstract description 5
- 230000003746 surface roughness Effects 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- B22C9/043—Removing the consumable pattern
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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
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of investment casting of titanium alloy castings, and particularly relates to a titanium alloy casting, a shell and a shell preparation method, wherein the middle shell preparation method comprises the following steps: s1: manufacturing a supporting core bar and a central core bar; s2: manufacturing a casting system wax pattern with the central core bar arranged inside; s3: manufacturing a structural member wax pattern and a riser wax pattern; s4: connecting the casting system wax pattern and the riser wax pattern to two sides of the structural member wax pattern; connecting a supporting core bar to one side of the riser wax pattern far away from the structural member wax pattern, and connecting the supporting core bar and the central core bar to obtain an integral wax pattern; s5: and (3) preparing a shell of the integral wax mould, and performing a wax mould dewaxing procedure after the preparation is finished to obtain the shell of the titanium alloy casting. The preparation method of the shell not only ensures the strength problem in the preparation process of the shell, but also avoids the influence of the core bars on the surface quality of the inner cavity of the shell, reduces the defects of the shell and the casting, and ensures that the casting meets the design requirements of high dimensional accuracy and high surface roughness.
Description
Technical Field
The invention belongs to the technical field of investment casting of titanium alloy castings, and particularly relates to a titanium alloy casting, a shell and a shell preparation method.
Background
Titanium alloy investment casting is the main method for industrially manufacturing products with high dimensional accuracy, low surface roughness and complex structures, and has been widely used for manufacturing components in the fields of aerospace, petroleum, chemical industry and the like. The pouring system designed in the casting process forms a molten metal channel in the casting process of the casting, and simultaneously supports the operation of the whole module in the coating process. In recent years, along with the improvement of the technical level of titanium alloy precision casting technology and precision castings and the application quantity of castings, large castings and complex multi-structure integrated castings continuously appear in the structural design of the castings, and therefore, higher requirements are put forward on the shape contour precision of wax patterns, shells or castings in the casting process; for example, a titanium alloy thin-wall case type part used in the aerospace industry field generally adopts a complex pouring system in the preparation process of a shell, and the whole rigidity of the shell is improved by assisting with a metal core bar and a lacing wire. Specifically, firstly, a metal core bar with a longitudinal support and a transverse support is arranged according to a pouring system, then the metal core bar is arranged in a pouring gate disc, the pouring gate disc with the core bar arranged therein is formed after wax pressing, and the weight of the module is supported by utilizing the rigid connection of the longitudinal support and the transverse support of the metal. And the subsequent preparation of the molded shell is completed through die assembly and coating, and tie bars are coordinated on the gate surface to ensure the integral strength.
However, since the core is to be pre-buried in the runner plate, the subsequent shell preparation is to be taken out of the shell, and there are some risks, as follows:
1. the core bar is required to be clean in surface, and impurities cannot be brought in to influence the quality of the shell;
2. the outer contour of the core bar is limited by the design size of the pouring channel, the structural strength of the core bar is limited, and the core bar is easy to deform and discard in the recycling process;
3. the matching and assembling requirements between the core bars have certain precision so as to ensure the size of the runner plate;
4. after the shell is prepared, the shell is easily scratched and bumped in the shell in the process of extracting the core bar from the shell;
5. increasing the lacing wire can increase the complexity of the module, and the sand spraying process is easy to produce shielding, so that the quality problem of the shell is caused.
That is, although the strength problem in the preparation process of the shell is guaranteed by the process, the complexity of the shell structure and the control difficulty of quality are increased, so that the coating of the shell in the preparation process is uneven, the defects of shell cracking, breakage and the like occur in the subsequent drying and roasting processes, the metallurgical defect at the inner part of the casting is formed in the casting pouring process, repair welding or repair is needed to be carried out on the casting after the casting molding, the surface quality of the casting is greatly affected, and the design requirements of the casting with high dimensional accuracy and high surface roughness cannot be met, so that the casting is scrapped.
Disclosure of Invention
The invention aims to provide a titanium alloy casting, a shell and a shell preparation method, which are used for at least solving one problem in the process of manufacturing the titanium alloy casting shell.
The first aspect of the invention provides a method for preparing a shell of a titanium alloy casting, which comprises the following steps:
s1: manufacturing a supporting core bar and a central core bar aiming at the titanium alloy casting structure and the pouring system scheme;
s2: manufacturing a pouring system wax mould with the central core bar built in aiming at a titanium alloy casting structure;
s3: manufacturing a structural member wax pattern and a riser wax pattern aiming at the titanium alloy casting structure;
s4: connecting the casting system wax pattern and the riser wax pattern to two sides of the structural member wax pattern; connecting the supporting core bar with one side of the riser wax pattern far away from the structural member wax pattern, and connecting the supporting core bar with the central core bar to obtain an integral wax pattern;
s5: and (3) preparing a shell of the integral wax mould, performing a dewaxing process of the wax mould after the preparation, and removing the supporting core bars, the central core bars and the wax material to obtain the shell of the titanium alloy casting.
In the method for producing a shell of a titanium alloy casting as described above, it is further preferable that the center core bar has a cylindrical shape; the center core bar penetrates through the center or the periphery of the structural member wax mould.
In the method for producing a shell of a titanium alloy casting as described above, it is further preferable that the support core includes a support portion and a connecting portion; the connecting part is suitable for being connected with the riser wax mould; the plurality of support parts are arranged, one ends of the plurality of support parts are connected, and the other ends of the plurality of support parts are arranged in a radioactive mode; each supporting part is connected with the connecting part.
In the above-described method for producing a shell of a titanium alloy casting, it is further preferable that the center core is connected to the support portion, and that the center core, the support portion, and the connection portion are integrally formed.
In the above-described method for producing a shell of a titanium alloy casting, it is further preferable that an end portion of the center core is fitted with a mounting ring, and that ends of the plurality of support portions are inserted into the mounting ring.
In the above-described method for producing a shell of a titanium alloy casting, it is further preferable that the support portion has a circular, U-shaped or square cross section.
In the above-described method for producing a shell of a titanium alloy casting, it is further preferable that the gating system wax pattern includes a main runner wax pattern and a split runner wax pattern, the main runner wax pattern being a hollow column molded on an outer surface of the center core bar; the number of the branch pouring gate wax patterns is multiple, one end of each branch pouring gate wax pattern is connected with the main pouring gate wax pattern, and the other end of each branch pouring gate wax pattern is connected with the structural member wax pattern.
In the above-described method for producing a shell of a titanium alloy casting, it is further preferable that the step S5 of performing the wax pattern dewaxing step includes:
s51: heating both ends of the central core so that wax material around the central core is melted first and falls out of the central core first after the central core loosens;
s52: heating is continued, and the rest wax is removed.
The invention also provides a shell of the titanium alloy casting, which is processed by adopting the preparation method of the shell of the titanium alloy casting.
The invention also provides a titanium alloy casting, which is obtained by processing the shell of the titanium alloy casting.
The invention provides a preparation method of a shell of a titanium alloy casting, which mainly comprises the working procedures of preparation of a supporting core bar and a central core bar, preparation of a casting system wax pattern based on the central core bar, preparation of a structural member wax pattern and a riser wax pattern, mold assembly, preparation of a shell, post treatment and the like, wherein the core bar is divided into the supporting core bar and the central core bar which are connected, the supporting core bar and the riser wax pattern are combined to form a supporting module of the structural member wax pattern during mold assembly, the supporting module is matched with the casting system wax pattern with the central core bar to form a frame, and finally the shell is prepared based on the frame. Compared with the existing core bar built-in shell preparation method, the method has the following beneficial effects:
in the preparation method of the shell, the supporting core bars are arranged outside the shell, so that the size of the pouring gate is not limited, the structural strength is ensured, and the supporting strength of the whole structure is further ensured;
the external supporting core bars do not influence the quality of the inner cavity of the shell, so that the requirements on the surface cleanliness and the matching precision of the supporting core bars are reduced, the preparation requirements and the difficulty of the shell are reduced, and the success rate of the shell preparation is improved;
the supporting core bars are arranged outside the shell and do not need to be pulled out from the shell, so that the quality problem of the shell caused by scratch and collision in the shell can be reduced, the metallurgical defect caused by the internal quality of the shell in casting molding is reduced, the preparation quality of the shell is controlled, and the technical bottleneck of repair welding of the subsequent casting can be reduced;
through setting up with supporting core bar and the separate use of gating system wax matrix, can play technology lacing wire effect with gating system wax matrix, can effectively promote module intensity, reduce the use of the metal lacing wire of shell, simplify shell structure, reduce the shielding that the coating process drenches the sand, improve the coating quality of shell preparation process, save people's operation reduce cost.
The preparation method of the shell not only ensures the strength problem in the preparation process of the shell, but also avoids the influence of the core bars on the surface quality of the inner cavity of the shell, simultaneously reduces the complexity of the structural frame of the shell and the control difficulty of the quality, reduces the defects of the shell, improves the success rate of the shell preparation, simultaneously reduces the defects of castings, and ensures that the castings meet the design requirements of high dimensional accuracy and high surface roughness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a mold structure of a middle shell in a method for preparing a shell of a titanium alloy casting according to the present invention;
FIG. 2 is a schematic diagram of the connection structure of a casting system wax pattern with a support core bar and a center core bar;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a cross-sectional view of FIG. 2;
FIG. 5 is a front view of FIG. 1;
fig. 6 is a cross-sectional view of fig. 1.
Reference numerals illustrate:
1-center core bar, 2-supporting part, 3-connecting part, 4-main runner wax pattern, 5-branch runner wax pattern, 6-riser wax pattern and 7-structural member wax pattern.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in the present invention will be understood in detail by those skilled in the art.
As shown in fig. 1 to 6, the method for preparing a shell of a titanium alloy casting according to an embodiment of the present invention mainly includes the following steps:
s1: manufacturing a supporting core bar and a central core bar 1 according to the titanium alloy casting structure and the pouring system scheme;
s2: manufacturing a pouring system wax mould with a built-in central core bar 1 aiming at a titanium alloy casting structure;
s3: manufacturing a structural member wax pattern 7 and a riser wax pattern 6 aiming at a titanium alloy casting structure;
s4: connecting the casting system wax pattern and the riser wax pattern 6 to two sides of the structural member wax pattern 7; connecting the supporting core bar with one side of the riser wax pattern 6 far away from the structural member wax pattern 7, and connecting the supporting core bar with the central core bar 1 to obtain an integral wax pattern;
s5: and (3) preparing a shell of the integral wax mould, performing a dewaxing process of the wax mould after the preparation, and removing the supporting core bar, the central core bar 1 and the wax material to obtain the shell of the titanium alloy casting.
The preparation method of the shell is mainly suitable for round titanium alloy castings with thick and large mounting edge structures, and the thick and large mounting edge structures are preferably circumferential structures or central symmetry structures. Such structures may be present on the upper and lower end surfaces of the titanium alloy casting in correspondence to facilitate support for subsequent sets of dies.
In S1, the central core 1 is preferably rod-shaped and the diameter is determined according to the diameter of the main runner in the casting system solution, so that the central core 1 can guarantee a higher strength with a limited volume. The central core bar 1 penetrates through the middle part or the periphery of the structural member wax mould 7, specifically, according to the shape of the titanium alloy casting, when the middle part of the titanium alloy casting is provided with a cavity suitable for accommodating the central core bar 1, the central core bar 1 penetrates through the middle cavity of the structural member wax mould 7, and when the middle part of the titanium alloy casting has no penetrating space, the central core bar 1 is arranged on the periphery of the structural member wax mould 7.
As shown in fig. 2-4, the support core comprises a support portion 2 and a connecting portion 3; the connecting part 3 is suitable for being connected with the riser wax mould 6; the plurality of support parts 2 are arranged, one ends of the plurality of support parts 2 are connected, and the other ends are arranged in a radioactive way; each supporting part 2 is connected with a connecting part 3. The supporting parts 2 are all positioned on the same plane, one ends of the supporting parts are connected, and the other ends of the supporting parts are arranged in a radioactive mode according to the shape of the structural member wax mould 7 and the position of the central core bar 1, and are suitable for supporting the structural member wax mould 7; preferably, in order to increase the strength of the support portion 2, the support portion 2 has a circular, U-shaped or square cross section. The connecting parts 3 are all vertically connected to the supporting part 2, and a plurality of connecting parts 3 can be arranged on the same supporting part 2 according to the riser design position of the structural member wax mould 7.
The central core bar 1 and the supporting core bars are of an integrated structure, wherein the central core bar 1 is connected with the connecting ends of the supporting parts 2; or the end part of the central core bar 1 is sleeved with a mounting ring, and the end parts of the plurality of supporting parts 2 are inserted into the mounting ring. Preferably, the central core bar 1 and the supporting core bar are in an integrated structure, so that on one hand, the integral strength is improved, and on the other hand, the assembly steps are reduced, and the structural precision is improved.
As shown in fig. 2 to 4, in S2, the gating system wax pattern includes a main runner wax pattern 4 and a branch runner wax pattern 5, the main runner wax pattern 4 being a hollow column formed on the outer surface of the center core bar 1; the number of the branch pouring gate wax patterns 5 is plural, one end of each branch pouring gate wax pattern 5 is connected with the main pouring gate wax pattern 4, and the other end is connected with the structural member wax pattern 7.
In the pouring system, the branch pouring gate can be a straight pouring gate or a curved pouring gate, and preferably, the branch pouring gate is a curved pouring gate, so that the branch pouring gate wax mould 5 plays a role of a process lacing wire in a subsequent frame. The main runner wax pattern 4 is directly molded on the outer side of the center core 1, and preferably, in order to improve the adhesion strength between the main runner wax pattern 4 and the center core 1, a screw thread may be provided on the center core 1. One end of the split runner wax pattern 5 is connected to the main runner wax pattern 4, and the other end is radially outwardly radiating from the main runner wax pattern 4, and is adapted to be connected to the structural member wax pattern 7 at the molding stage. Depending on the gating system design, the same split runner wax pattern 5 may be provided with multiple connection points to connect with multiple different locations of the structural member wax pattern 7 at the same time.
Specifically, when the pouring system wax mould is manufactured, the central core bar 1 can be placed in a pouring channel mould, and the pouring channel wax mould is pressed in a wax pressing machine; or manually pouring wax to form the pouring wax mould.
In S3, the structural member wax pattern 7 and the riser wax pattern 6 are fabricated according to the titanium alloy casting structure, wherein the size of the riser wax pattern 6 needs to be increased to improve the subsequent connection and support strength.
As shown in fig. 1, 5 and 6, in S4, the casting system wax pattern and the riser wax pattern 6 are fixedly connected to two sides of the structural member wax pattern 7 by using wax, then the supporting core bar and the central core bar 1 are fixedly connected, and then the supporting core bar and the riser wax pattern 6 are fixedly connected by using wax, thereby obtaining the integral wax pattern.
And S5, performing a coating process on the integral wax mould in the step S4 to finish a shell preparation process. And after the preparation is finished, a dewaxing process of the wax mould is carried out to remove the supporting core bar, the central core bar 1 and the wax material, so as to obtain the shell of the titanium alloy casting.
Specifically, the step S5 of performing the wax pattern dewaxing step includes:
s51: heating both ends of the central core 1 to melt the wax around the central core 1 first, and removing the central core 1 first after the central core 1 loosens;
s52: heating is continued, and the rest wax is removed.
Heating the two ends of the central core bar 1 by adopting a two-end heating method, so that wax materials around the central core bar 1 are melted first, and after the structure of the central core bar 1 is loosened by heating, the central core bar 1 is firstly separated from the wax mould to form a cavity in the center of the wax mould; and continuing heating, and performing the subsequent dewaxing step, wherein in the dewaxing process, the force generated in the wax melting and expanding process is released from the cavity and does not directly act on the surface of the shell, so that shell expansion caused by wax expansion in the dewaxing process of the wax mould is avoided.
The method for manufacturing the shell in the above embodiment includes the steps of manufacturing the supporting core bar and the central core bar 1, manufacturing the casting system wax pattern based on the central core bar 1, manufacturing the structural member wax pattern 7 and the riser wax pattern 6, assembling the mold, manufacturing the shell, post-processing and the like, dividing the core bar into the supporting core bar and the central core bar 1 which are connected, combining the supporting core bar and the riser wax pattern 6 to form a supporting module of the structural member wax pattern 7 during assembling, forming a frame by matching with the casting system wax pattern with the central core bar 1, and finally manufacturing the shell based on the frame. Compared with the existing core bar built-in shell preparation method, the method has the following beneficial effects:
the supporting core bars are arranged outside the shell, so that the size of the pouring gate is not limited, the structural strength is ensured, and the supporting strength of the whole structure is further ensured;
the external supporting core bars do not influence the quality of the inner cavity of the shell, so that the requirements on the surface cleanliness and the matching precision of the supporting core bars are reduced, the preparation requirements and the difficulty of the shell are reduced, and the success rate of the shell preparation is improved;
the supporting core bars are arranged outside the shell and do not need to be pulled out from the shell, so that the quality problem of the shell caused by scratch and collision in the shell can be reduced, the metallurgical defect caused by the internal quality of the shell in casting molding is reduced, the preparation quality of the shell is controlled, and the technical bottleneck of repair welding of the subsequent casting can be reduced;
through setting up with supporting core bar and the separate use of gating system wax matrix, can play technology lacing wire effect with gating system wax matrix, simplify the mould structure, reduce the shielding that the coating process drenches the sand, improve shell quality, reduce simultaneously and set up the lacing wire by hand, save people's operation reduce cost.
The invention also provides a shell of the titanium alloy casting, which is processed by adopting the shell preparation method of the titanium alloy casting in the embodiment. The preparation method of the shell not only ensures the strength problem of the shell in the preparation process of the shell, but also avoids the influence of the core bars on the surface quality of the inner cavity of the shell, simultaneously reduces the complexity of the structural frame of the shell and the control difficulty of the quality, reduces the defects of the shell, and improves the success rate of the shell preparation and the shell quality.
The invention also provides a titanium alloy casting which is obtained by processing the shell of the titanium alloy casting, so that the titanium alloy casting has all the beneficial effects brought by the technical scheme in the embodiment, further reduces the titanium alloy defects of the casting, and ensures that the casting meets the design requirements of high dimensional accuracy and high surface roughness.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method for preparing a shell of a titanium alloy casting, comprising the steps of:
s1: manufacturing a supporting core bar and a central core bar aiming at the titanium alloy casting structure and the pouring system scheme;
s2: manufacturing a pouring system wax mould with the central core bar built in aiming at a titanium alloy casting structure;
s3: manufacturing a structural member wax pattern and a riser wax pattern aiming at the titanium alloy casting structure;
s4: connecting the casting system wax pattern and the riser wax pattern to two sides of the structural member wax pattern, connecting the supporting core bar to one side of the riser wax pattern far away from the structural member wax pattern, and connecting the supporting core bar and the central core bar to obtain an integral wax pattern;
s5: preparing a shell of the integral wax mould, performing a dewaxing process of the wax mould after the preparation is finished, and removing the supporting core bars, the central core bars and the wax material to obtain the shell of the titanium alloy casting;
the pouring system wax pattern comprises a main pouring gate wax pattern and a branch pouring gate wax pattern, and the main pouring gate wax pattern is a hollow column formed on the outer surface of the central core bar; the number of the branch pouring gate wax patterns is multiple, one end of each branch pouring gate wax pattern is connected with the main pouring gate wax pattern, and the other end of each branch pouring gate wax pattern is connected with the structural member wax pattern;
the central core bar is rod-shaped and penetrates through the middle or the periphery of the structural member wax mould;
the supporting core bar comprises a supporting part and a connecting part; the connecting part is connected with the riser wax mould; the plurality of support parts are arranged, one ends of the plurality of support parts are connected, and the other ends of the plurality of support parts are arranged in a radioactive mode; each supporting part is connected with the connecting part.
2. The method for producing a shell of a titanium alloy casting according to claim 1, wherein,
the center core bar is connected with the supporting part, and the center core bar, the supporting part and the connecting part are of an integrated structure.
3. The method for producing a shell of a titanium alloy casting according to claim 1, wherein,
the end part of the central core bar is sleeved with a mounting ring, and the end parts of the supporting parts are inserted into the mounting ring.
4. The method of producing a shell of a titanium alloy casting according to claim 1, wherein the support portion has a circular, U-shaped or square cross section.
5. The method for producing a shell of a titanium alloy casting according to claim 1, wherein,
the step S5 of performing the wax pattern dewaxing step includes:
s51: heating both ends of the central core so that wax material around the central core is melted first and falls out of the central core first after the central core loosens;
s52: heating is continued, and the rest wax is removed.
6. A titanium alloy cast shell, characterized in that it is manufactured by the method for manufacturing a titanium alloy cast shell according to any one of claims 1 to 5.
7. A titanium alloy casting, characterized in that the shell of the titanium alloy casting is processed.
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| CN202210157629.1A CN114535504B (en) | 2022-02-21 | 2022-02-21 | Titanium alloy casting, shell and shell preparation method |
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