CN117655281A - Method for arranging interference structure in fine casting shell and aeroengine - Google Patents
Method for arranging interference structure in fine casting shell and aeroengine Download PDFInfo
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- CN117655281A CN117655281A CN202311631391.2A CN202311631391A CN117655281A CN 117655281 A CN117655281 A CN 117655281A CN 202311631391 A CN202311631391 A CN 202311631391A CN 117655281 A CN117655281 A CN 117655281A
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- shell
- interference structure
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- wax
- mould
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005266 casting Methods 0.000 title claims abstract description 26
- 230000000903 blocking effect Effects 0.000 claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 16
- 238000007598 dipping method Methods 0.000 claims abstract description 13
- 238000007790 scraping Methods 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000006872 improvement Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000005495 investment casting Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007528 sand casting Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
Abstract
The invention discloses a method for arranging an interference structure in a fine casting mold shell and an aeroengine, which comprise the following steps: s1, designing an interference structure and a blocking block; s2, designing the shape and the size of the cavity wax mould according to the size of the interference structure and the size of the blocking; s3, welding the cavity wax pattern with the casting system wax pattern and the part wax pattern to form a combined wax pattern; s4, performing slurry dipping and sand hanging on the combined wax mould to prepare a shell, and scraping slurry on the opening surface of the cavity wax mould; s5, dewaxing to prepare a cavity shell; s6, placing the interference structure in the cavity shell, and installing the blocking block to limit the interference structure. The method is simple in integral operation, the original pouring system is not required to be changed, the feeding capacity of the original pouring system to the casting is maintained, other materials with specific functions are distributed more directly close to the part, the functional effect of the casting is improved, and meanwhile the integral strength and the integrity of the mould shell are prevented from being damaged.
Description
Technical Field
The invention relates to the technical field of precision casting, in particular to a method for arranging an interference structure in a precision casting shell and an aeroengine.
Background
In the precision casting field, a precision casting is formed by pouring molten metal into a closed complex ceramic shell that has been prepared. The structure of the precision casting is complex, and often consists of a plurality of parts, such as a director casting is divided into an inner ring and an outer ring and tens of blades, and a casing casting consists of a large number of oil grooves and gas paths. Therefore, in order to prepare the precision casting, the inner cavity of the ceramic shell is extremely complex. The ceramic shell is made into an integral shell by adopting a coating method, except a pouring cup, no other openings are formed, a closed complex inner cavity is formed, and after the integral shell is formed, functional structures of other materials cannot be placed at specified positions in the shell in a normal mode. Unlike sand casting, the cavity of sand casting is assembled by a plurality of sand molds, the placement positions of other materials can be designed in advance in the assembly process, and the other materials can be placed in the sand mold assembly process.
Therefore, in the technical field of precision casting, other materials with specific functions can be placed only at the pouring cup or outside the mold shell, and although a certain effect can be achieved, the effect cannot achieve an ideal state. Such as: the filter screen can only be placed in pouring cup department, can only filter the inclusion that the molten metal itself carried, but after the molten metal passes through parts such as sprue, cross gate, the interior inclusion that has the mould shell of molten metal, can't get rid of through the filter screen again, consequently the filter effect can't reach ideal effect. For example: the chill is arranged outside the mould shell, and the chill can only cool the mould shell and then cool the metal in the inner cavity of the mould shell through the cooled mould shell, so the function effect as the chill is not ideal.
Disclosure of Invention
The invention provides a method for arranging an interference structure in a fine casting shell and an aeroengine, which are used for solving the technical problem that other material functional structures cannot be arranged in a ceramic shell in the prior art.
The technical scheme adopted by the invention is as follows:
a method of providing an interference structure in a fine mold shell, comprising:
s1, designing an interference structure and a blocking block;
s2, designing the shape and the size of the cavity wax mould according to the size of the interference structure and the size of the blocking;
s3, welding the cavity wax pattern with the casting system wax pattern and the part wax pattern to form a combined wax pattern;
s4, performing slurry dipping and sand hanging on the combined wax mould to prepare a shell, and scraping slurry on the opening surface of the cavity wax mould;
s5, dewaxing to prepare a cavity shell;
s6, placing the interference structure in the cavity shell, and installing the blocking block to limit the interference structure.
As a further improvement of the above technical solution, step S2 includes:
s21, measuring the expansion coefficient of a material used for the interference structure;
s22, matching the shrinkage coefficient of the wax pattern according to the expansion coefficient of the material used by the interference structure;
s23, designing the shape and the size of the cavity wax mould according to the size of the interference structure, the size of the blocking and the shrinkage coefficient of the wax mould.
As a further improvement of the above technical solution, the method for disposing an interference structure in a fine casting mold shell further includes:
the drop melting point of the cavity wax pattern is less than the drop melting point of the casting system wax pattern.
As a further improvement of the above technical solution, step S4 includes:
s41, dipping slurry and hanging sand on the combined wax mould;
s42, scraping off slurry on the opening surface of the cavity wax mould after each slurry dipping and sand hanging, and leaking out of the surface of the wax mould;
s43, repeating the steps S41-S42 until the layer number requirement of the shell is met.
As a further improvement of the above technical solution, step S6 includes:
s61, placing the interference structure in a cavity shell;
s62, installing a block on the cavity shell, and bonding the block and the cavity shell by using shell-making slurry;
s63, drying to form a complete shell.
As a further improvement of the above technical solution, the size of the mating end face of the blocking is larger than the size of the interference structure; the outer diameter of the blocking piece gradually decreases from the free end face to the matched end face.
As a further improvement of the technical scheme, the inner diameter of the cavity wax mould is reduced from the open end to the bottom end.
As a further improvement of the above technical solution, when the block is mounted in the cavity shell, the free end face of the block is located in the open end of the cavity shell.
As a further improvement of the above technical solution, the block is a ceramic block.
According to another aspect of the invention, there is also provided an aeroengine employing any of the above methods of providing an interference structure in a fine cast housing.
The invention has the following beneficial effects:
the method comprises the steps of setting the position of an interference structure according to requirements, matching and designing a corresponding interference structure and a blocking block for limiting the interference structure, matching and designing the shape and the size of a cavity wax mould according to the shape and the size of the interference structure and the shape and the size of the blocking block, carrying out combination welding on the manufactured cavity wax mould, the casting system wax mould and the part wax mould, dipping slurry and sand to prepare a shell by the combined wax mould, dewaxing to form a cavity shell, and then placing the interference structure in a cavity formed by the cavity wax mould, blocking and keeping the integrity of the shell to form an integral shell with the interference structure.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a block and filter design diagram of step S1 according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cavity wax pattern design of step S23 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a composite wax pattern of step S3 according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a dewaxed cavity shell in step S5 according to one embodiment of the present invention;
fig. 5 is a schematic diagram of placement of the filter screen in step S61 according to the first embodiment of the present invention;
fig. 6 is a block plugging schematic diagram of step S62 according to the first embodiment of the present invention;
fig. 7 is a schematic block bonding diagram of step S62 according to the first embodiment of the present invention;
FIG. 8 is a schematic diagram of a complete shell of step S63 according to the first embodiment of the present invention;
1. the device comprises a blocking block 2, a filter screen 3, a cavity shell 4, a cavity wax pattern 5, a casting system wax pattern 6, a part wax pattern 7 and slurry.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The preferred embodiment of the present invention provides a method for providing an interference structure in a fine mold shell, comprising the following:
s1, designing an interference structure and a blocking block;
s2, designing the shape and the size of the cavity wax mould according to the size of the interference structure and the size of the blocking;
s3, welding the cavity wax pattern with the casting system wax pattern and the part wax pattern to form a combined wax pattern;
s4, performing slurry dipping and sand hanging on the combined wax mould to prepare a shell, and scraping slurry on the opening surface of the cavity wax mould;
s5, dewaxing to prepare a cavity shell;
s6, placing the interference structure in the cavity shell, and installing the blocking block to limit the interference structure.
The interference structure is a structure which is made of other materials and realizes a specific function, for example, a filter screen, a chill, a chilling material with good thermal conductivity, a heat storage material with poor thermal conductivity, a polymorphonuclear material which can react with molten metal to promote the solidification of the molten metal, and the like, and is selected according to the actual requirements of casting tissues;
it can be understood that the method sets up the corresponding interference structure of position matching design of the interference structure and the blocking used for limiting the interference structure according to the need, and matches the shape and size of the interference structure and the shape and size of the blocking to design the shape and size of the cavity wax pattern, after the manufactured cavity wax pattern, the casting system wax pattern and the part wax pattern are combined and welded, the combined wax pattern is dipped with slurry and hung with sand to prepare a shell, after dewaxing to form a cavity shell, the interference structure can be placed in a cavity formed by the cavity wax pattern, and then blocking is used to keep the integrity of the shell to form a complete shell with the interference structure installed therein.
In this embodiment, step S2 includes:
s21, measuring the expansion coefficient of a material used for the interference structure;
s22, matching the shrinkage coefficient of the wax pattern according to the expansion coefficient of the material used by the interference structure;
s23, designing the shape and the size of a cavity wax pattern according to the size of the interference structure, the size of the blocking and the shrinkage coefficient of the wax pattern;
for example, if the expansion coefficient of the material with poor thermal conductivity is 1, the cavity wax pattern is designed according to the conventional size; for another example, a material with good heat conductivity is placed, and assuming that the expansion coefficient is 1.03, the shrinkage coefficient of the size of the cavity wax pattern is 1.03-1.04, so that shaking caused by overlarge scaling after the interference structure is placed is avoided; based on the method, the die shell is prevented from being damaged due to overlarge heating expansion of the interference structure.
In this embodiment, the method for setting an interference structure in the fine casting mold shell further includes:
the drop melting point of the cavity wax mould is smaller than that of the casting system wax mould and that of the part wax mould, so that the cavity wax mould is melted earlier than that of the casting system wax mould and the part wax mould, the cavity wax mould is converted into wax liquid in advance to be discharged, the shell is prevented from expanding at the position of the cavity wax mould, and the shell is prevented from expanding at the position.
In the step S3, the joint between the casting system wax pattern and the part wax pattern after welding and the cavity wax pattern is kept smooth and flat, the integrity of the cavity wax pattern is maintained during welding, the cavity wax pattern cannot be damaged, any form of defect is avoided, the problem that the interference structure cannot be placed in the cavity formed finally is avoided, and secondly, the positioning of the interference structure is not affected due to the fact that the local protrusion is allowed.
In this embodiment, step S4 includes:
s41, dipping slurry and hanging sand on the combined wax mould; the method is realized by referring to a wax mould shell manufacturing mode in the prior art;
s42, scraping off slurry on the opening surface of the cavity wax mould after each slurry dipping and sand hanging, and leaking out of the surface of the wax mould; the manufactured shell can form an opening at a corresponding position for placing the interference structure and the blocking block;
s43, repeating the steps S41-S42 until the layer number requirement of the shell is met.
The dewaxing step of the shell prepared in step S5 is performed by referring to a dewaxing method of the prior art, and the cavity shell is also formed with an opening at a side position for placing the interference structure except for the position of the pouring cup.
In this embodiment, step S6 includes:
s61, placing the interference structure in a cavity shell; namely, placing an interference structure in a cavity formed at the position of the cavity wax pattern;
s62, installing a block on the cavity shell, and bonding the block and the cavity shell by using shell-making slurry; the blocking blocks limit the interference structure, and the blocking blocks are bonded with the cavity shells by using the shell-making slurry, so that no gap is ensured, and leakage in subsequent casting is avoided;
s63, drying to form a complete shell.
In this embodiment, the size of the mating end face of the blocking is larger than the size of the interference structure; the outer diameter of the blocking block gradually decreases from the free end face to the matching end face, so that the blocking block can ensure the limit fixation of the interference structure, in addition, the blocking block is in a truncated cone shape, and an inner cavity formed by the cavity shell is provided with a conical surface to be matched with the conical surface during installation, so that the assembly is convenient and the matching is tight;
further, the inner diameter of the cavity wax mould is reduced from the opening end to the bottom end, namely, the inner wall matched with the interference structure is a conical surface, and the inner cavity of the manufactured cavity shell for installing the interference structure is also provided with a conical surface which is matched with the blocking and the interference structure respectively, so that the cavity wax mould has a certain guiding effect, is convenient to assemble, is tightly matched, and avoids damage.
Further, when the blocking piece is arranged on the cavity wax mould, the free end face of the blocking piece is positioned in the opening end of the cavity wax mould, the height of the free end face of the blocking piece after assembly is lower than the height of the opening end of the cavity shell,
in this embodiment, the block is a ceramic block.
On the other hand, the embodiment also provides an aeroengine, and the method for arranging the interference structure in the fine casting mold shell is applied.
Example 1
Referring to fig. 1 to 8, in the present embodiment, the interference structure takes the filter screen 2 as an example; the method for setting the interference structure in the fine casting mold shell in the embodiment comprises the following steps:
s1, designing a filter screen 2 and a blocking block 1; referring to fig. 1, the size of the mating end face of the block 1 is larger than the size of the filter screen 2; the outer diameter of the blocking piece 1 gradually decreases from the free end face to the matched end face;
s21, measuring the expansion coefficient of a material used by the filter screen 2;
s22, matching the shrinkage coefficient of the wax pattern according to the expansion coefficient of the material used by the filter screen 2;
s23, designing the shape and the size of the cavity wax mould 4 according to the size of the filter screen 2, the size of the blocking 1 and the shrinkage coefficient of the wax mould; referring to fig. 2, the inner diameter of the cavity wax pattern 4 tends to decrease from the open end to the bottom end;
s3, welding the cavity wax pattern 4 with the pouring system wax pattern 7 and the part wax pattern 6 to form a combined wax pattern; reference may be made to fig. 3;
s41, dipping slurry and hanging sand on the combined wax mould; the method is realized by referring to a wax mould shell manufacturing mode in the prior art;
s42, scraping off the slurry 7 on the opening surface of the cavity wax mould 4 after each dipping and sand coating, and leaking out the surface of the wax mould; the manufactured shell can form an opening at the corresponding position for placing the filter screen 2 and the blocking block 1;
s43, repeating the steps S41-S42 until the layer number requirement of the shell is met;
s5, dewaxing to prepare a cavity shell 3; referring to fig. 4;
s61, placing the filter screen 2 in the cavity shell 3; referring to fig. 5, a filter screen 2 is placed in a cavity formed in the position of a cavity wax pattern 4;
s62, installing a block 1 on the cavity shell 3, and adhering the block 1 and the cavity shell 3 by using a shell-making slurry 7; referring to fig. 6, the filter screen 2 is limited by the blocking block 1, referring to fig. 7, the blocking block 1 and the cavity shell 3 are bonded by using the shell-making slurry 7, no gap is ensured, leakage in subsequent casting is avoided, and the integrity of the shell is ensured;
s63, drying to form a complete shell, wherein the filter screen 2 is placed in the cavity shell 3, and particularly referring to fig. 8.
The mold shell manufactured based on the method can be used for placing the filter screen 2 in the mold shell without affecting the state of the mold shell, so that the structural integrity of the mold shell is ensured, the filter screen 2 is arranged in the mold shell and can be used for filtering impurities in the mold shell attached to molten metal after the molten metal passes through the sprue and the runner, and the filtering effect is effectively improved.
Example two
In the embodiment, the interference structure is the chill, and the mold shell manufactured based on the method can be used for placing the chill in the mold shell without affecting the state of the mold shell, so that the structural integrity of the mold shell is ensured, the cooling effect on the inside of the mold shell is improved, and the action of the chill is effectively exerted.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of providing an interference structure in a fine mold shell, comprising:
s1, designing an interference structure and a blocking block (1);
s2, designing the shape and the size of the cavity wax mould (4) according to the size of the interference structure and the size of the blocking block (1);
s3, welding the cavity wax pattern (4) with the pouring system wax pattern (5) and the part wax pattern (6) to form a combined wax pattern;
s4, performing slurry dipping and sand hanging on the combined wax mould to prepare a shell, and scraping off slurry (7) on the opening surface of the cavity wax mould (4);
s5, dewaxing to prepare a cavity shell (3);
s6, placing the interference structure in the cavity shell (3), and limiting the interference structure by the installation block (1).
2. The method of providing an interference structure in a fine mold shell according to claim 1, wherein step S2 comprises:
s21, measuring the expansion coefficient of a material used for the interference structure;
s22, matching the shrinkage coefficient of the wax pattern according to the expansion coefficient of the material used by the interference structure;
s23, designing the shape and the size of the cavity wax mould (4) according to the size of the interference structure, the size of the blocking block (1) and the shrinkage coefficient of the wax mould.
3. The method of providing an interference structure in a fine mold according to claim 1, further comprising:
the drop melting point of the cavity wax mould (4) is smaller than that of the pouring system wax mould (5) and that of the part wax mould (6).
4. The method of providing an interference structure in a fine mold shell according to claim 1, wherein step S4 comprises:
s41, dipping slurry and hanging sand on the combined wax mould;
s42, scraping off slurry (7) on the opening surface of the cavity wax mould (4) after each dipping slurry and sand coating, and leaking out of the surface of the wax mould;
s43, repeating the steps S41-S42 until the layer number requirement of the shell is met.
5. The method of providing an interference structure in a fine mold shell according to claim 1, wherein step S6 includes:
s61, placing an interference structure in the cavity shell (3);
s62, installing a blocking piece (1) on the cavity shell (3), and adhering the blocking piece (1) and the cavity shell (3) by using a shell-making slurry (7);
s63, drying to form a complete shell.
6. The method of providing an interference structure in a fine-cast shell according to claim 1, characterized in that the dimensions of the mating end face of the block (1) are greater than the dimensions of the interference structure; the outer diameter of the blocking piece (1) gradually decreases from the free end face to the matched end face.
7. The method of providing an interference structure in a fine mold shell according to claim 6, wherein the cavity wax pattern (4) has an inner diameter that tapers from an open end to a bottom end.
8. Method for providing an interference structure in a fine-mould shell according to claim 1, characterized in that the free end face of the block (1) is located in the open end of the cavity shell (3) when the block (1) is mounted in the cavity shell (3).
9. The method for arranging an interference structure in a fine casting mold shell according to claim 1, wherein the block (1) is a ceramic block (1).
10. An aircraft engine, characterized in that a method of arranging an interference structure in a fine-cast shell according to any one of claims 1-9 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631391.2A CN117655281A (en) | 2023-12-01 | 2023-12-01 | Method for arranging interference structure in fine casting shell and aeroengine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631391.2A CN117655281A (en) | 2023-12-01 | 2023-12-01 | Method for arranging interference structure in fine casting shell and aeroengine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117655281A true CN117655281A (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311631391.2A Pending CN117655281A (en) | 2023-12-01 | 2023-12-01 | Method for arranging interference structure in fine casting shell and aeroengine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117655281A (en) |
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2023
- 2023-12-01 CN CN202311631391.2A patent/CN117655281A/en active Pending
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