CN113560490A - Middle section wax pattern mould - Google Patents
Middle section wax pattern mould Download PDFInfo
- Publication number
- CN113560490A CN113560490A CN202110831294.2A CN202110831294A CN113560490A CN 113560490 A CN113560490 A CN 113560490A CN 202110831294 A CN202110831294 A CN 202110831294A CN 113560490 A CN113560490 A CN 113560490A
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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
Abstract
The invention provides a middle section wax mould, which comprises: a mold base; the outer mold structure comprises an outer module and two movable outer modules; the middle mold structure is arranged on the inner side of the outer mold structure and comprises an inner ring middle mold structure, a peripheral middle mold structure and a middle mold bottom ring; the inner ring cylinder is arranged on the inner side of the inner ring middle mold structure; the loose piece structure comprises two first loose pieces, two second loose pieces and a combined loose piece; the cover plate is arranged at the top of the outer mold structure, the middle mold structure and the inner mold ring barrel, an outer mold ring sleeve is fixedly arranged on the outer edge of the bottom of the cover plate, and the outer mold ring sleeve is sleeved on the outer sides of the outer mold structure and the movable block structure. The invention has reasonable structural design, can completely form the inner and outer ring-shaped structures and the communicating channel of the middle-section wax mould, and has no influence on the shape and the precision of the wax mould in the demoulding process.
Description
Technical Field
The invention relates to the technical field of precision casting of aero-engines, in particular to a middle section wax pattern mold.
Background
The precision casting is a general term of a process for obtaining a precise casting by using a precision molding method, and compared with the traditional sand casting process, the precision casting has the advantages that the size of the casting obtained by precision casting is more accurate, the surface smoothness is better, and the precision casting comprises investment casting, ceramic mold casting, metal mold casting, pressure casting and lost foam casting. Precision casting is a common part manufacturing process in the field of aviation.
The aero-engine is a highly complex and precise thermodynamic machine, the quality of a middle section part directly influences the overall quality of the aero-engine, and the middle section part is provided with an inner ring-shaped structure and an outer ring-shaped structure, a communicated channel is arranged between the two ring-shaped structures, the manufacturing difficulty is high, a wax mold of the middle section part needs to be cast firstly, and then the wax mold is used for realizing the overall manufacturing of the middle section part. The whole shaping of two rings of loop configuration and intercommunication passageway can't be realized to current middle section wax matrix mould, simultaneously because the structure is complicated when the softer of wax matrix texture, and the difficult wax matrix that guarantees of conventional drawing of patterns possesses sufficient precision and overall structure integrity when the drawing of patterns.
Disclosure of Invention
The invention provides a middle-section wax pattern die, and aims to solve the problems that the existing middle-section wax pattern die cannot realize integral forming of an annular structure and a channel, and the precision and the integrity of a wax pattern are easily influenced by a conventional demoulding mode.
In order to achieve the above object, an embodiment of the present invention provides a middle segment wax pattern mold, including:
a mold base;
the outer die structure is of an annular structure and comprises an outer module and two movable outer die blocks, a filling port is arranged between the two movable outer die blocks, a first outer die top cover is arranged on the inner side of the top of the outer module, and second outer die top covers are arranged on the tops of the movable outer die blocks;
the middle mold structure is arranged on the inner side of the outer mold structure and comprises an inner ring middle mold structure, a peripheral middle mold structure and a middle mold bottom ring, the peripheral middle mold structure comprises a plurality of large and medium modules and a plurality of small and medium modules, the large and medium modules and the small and medium modules are arranged at intervals, the large and medium modules and the small and medium modules are sleeved outside the inner peripheral middle mold structure, and the middle mold bottom ring is arranged at the bottom of the peripheral middle mold structure;
the inner ring cylinder is arranged on the inner side of the inner ring middle mold structure;
the movable block structure comprises two first movable blocks, two second movable blocks and a combined movable block, the two first movable blocks are respectively arranged on the two movable block outer modules in a penetrating manner, the two second movable blocks are respectively arranged at the joints of the two movable block outer modules and the two movable block outer modules, the combined movable block is arranged at the joint of the two movable block outer modules in a penetrating manner, and the combined movable block and the second movable block both penetrate through the middle die structure and the inner die ring barrel;
the cover plate is arranged at the top of the outer mold structure, the middle mold structure and the inner mold ring barrel, an outer mold ring sleeve is fixedly arranged on the outer edge of the bottom of the cover plate, and the outer mold ring sleeve is sleeved on the outer sides of the outer mold structure and the movable block structure.
Wherein, the mould base is provided with a base handle.
And outer die handles are arranged on the outer sides of the outer module and the movable outer module.
Wherein, the inside of interior mould ring section of thick bamboo is provided with the lock pin.
The inner ring middle die structure comprises three middle die movable blocks and a middle die ring barrel, and the three middle die movable blocks are annularly arranged at the top of the middle die ring barrel.
The mould base is provided with a positioning strip, the positioning strip is provided with a mounting groove for positioning the center of the middle mould bottom ring, and the middle mould ring cylinder, the inserting core, the inner mould ring cylinder and the outer mould are structurally provided with positioning grooves matched with the positioning strip shapes.
The die base is provided with two positioning rods, and the middle die bottom ring is installed on the die base and the installation groove in an angular positioning mode through the positioning rods.
The combined movable block comprises a first combined movable block and a second combined movable block, the front end of the second combined movable block is of an elliptic cylindrical structure, the shape of the rear end of the second combined movable block is matched with the shape of the inner wall of the inner mold ring barrel, the front end of the second combined movable block penetrates through the inner mold ring barrel, the rear end of the second combined movable block is embedded on the inner wall of the inner mold ring barrel, the rear end of the first combined movable block is of a cylindrical structure, and the front end of the first combined movable block penetrates through the rear end of the second combined movable block and penetrates through the inserting core.
The top of the middle die movable block is provided with a cover plate positioning column, and the cover plate is installed on the top surface of the middle die movable block through the cover plate positioning column.
The scheme of the invention has the following beneficial effects:
the middle-section wax mold disclosed by the invention bears the whole mold structure through the mold base, the filling material is injected into the mold through the filling port after the pressing plate of the filling machine tightly presses the mold cover plate, the filling material can form an outer ring annular structure of the middle-section wax mold between the outer mold structure and the middle mold structure, an inner ring annular structure of the middle-section wax mold is formed between the middle mold structure and the inner mold annular cylinder, a communicated channel structure is formed between the outer ring and the inner ring of the middle-section wax mold through a loose piece structure, a channel opening is formed in the outer ring of the middle-section wax mold, and the mold is demolded after the filling material is cooled; after the cover plate and the outer mold ring sleeve are removed, the first combined movable block is pulled out along the inserting direction, the inserting core is removed from the fixing and upwards separated, the second combined movable block is inwards taken out, the inner mold ring barrel can upwards separate at the moment, after the rest movable block structure is removed, the outer mold structure can be outwards pulled away, meanwhile, the three middle mold movable blocks can be simultaneously upwards removed, the wax mold communicated with the rest mold part is taken down through the middle mold bottom ring, the middle mold ring barrel is downwards taken out from the lower end, and finally, a plurality of small and medium modules are taken out, and the large and medium module in the yielding space can be taken out along with the small and medium modules. The invention has reasonable structural design, can completely form the inner and outer annular structures and the communicating channel of the wax mould, has the flow of the demoulding process, and does not influence the shape and the precision of the wax mould.
Drawings
FIG. 1 is a schematic structural view of a middle section wax pattern mold of the present invention;
FIG. 2 is a schematic view of a coverplate-free structure of a middle wax pattern mold according to the present invention;
FIG. 3 is a schematic diagram of the no-outer-mold structure of the middle section wax mold of the present invention;
FIG. 4 is a schematic view of a combined loose piece structure of a middle section wax pattern mold of the present invention;
FIG. 5 is a schematic diagram of a central mold structure in the periphery of the middle section wax mold of the present invention;
FIG. 6 is a schematic view of an inner wall middle mold structure of the middle section wax mold of the present invention;
FIG. 7 is a top view of a middle mold ring barrel of the mid-section wax mold of the present invention;
FIG. 8 is a first schematic view of the assembly loose piece installation of the middle section wax pattern mold of the present invention;
FIG. 9 is a second schematic view of the assembly loose piece installation of the middle section wax pattern mold of the present invention;
FIG. 10 is a schematic view of a partial structure of a middle section wax pattern mold of the present invention.
[ description of reference ]
1-a mould base; 2-an outer module; 3-loose piece outer module; 4-a material injection port; 5-a first outer mold top cover; 6-a second outer mold top cover; 7-middle mould bottom ring; 8-large and medium module; 9-small and medium module; 10-inner mold ring cylinder; 11-a first loose piece; 12-a second loose piece; 13-a cover plate; 14-outer mold ring sleeve; 15-core insert; 16-a base handle; 17-an outer mold handle; 18-middle mould movable block; 19-middle mould ring cylinder; 20-middle mold positioning columns; 21-a positioning strip; 22-a positioning rod; 23-a first modular loose piece; 24-a second combined movable block; 25-cover plate positioning columns; 26-middle section wax pattern.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a middle-section wax pattern die, aiming at the problems that the existing middle-section wax pattern die cannot realize the integral forming of an annular structure and a channel, and the precision and the integrity of a wax pattern are easily influenced by a conventional demoulding mode.
As shown in fig. 1 to 10, an embodiment of the present invention provides a middle segment wax pattern mold, including: a mold base 1; the outer die structure is of an annular structure and comprises an outer module 2 and two movable block outer modules 3, a filling port 4 is arranged between the two movable block outer modules 3, a first outer die top cover 5 is arranged on the inner side of the top of the outer module 2, and second outer die top covers 6 are arranged on the tops of the movable block outer modules 3; the middle mold structure is arranged on the inner side of the outer mold structure and comprises an inner ring middle mold structure, a peripheral middle mold structure and a middle mold bottom ring 7, the peripheral middle mold structure comprises a plurality of large and medium modules 8 and a plurality of small and medium modules 9, the large and medium modules 8 and the small and medium modules 9 are arranged at intervals, the large and medium modules 8 and the small and medium modules 9 are sleeved outside the inner peripheral middle mold structure, and the middle mold bottom ring 7 is arranged at the bottom of the peripheral middle mold structure; the inner ring cylinder 10 is arranged on the inner side of the inner ring middle mold structure, and the inner ring cylinder 10 is arranged on the inner side of the inner ring middle mold structure; the movable block structure comprises two first movable blocks 11, two second movable blocks 12 and a combined movable block, the two first movable blocks 11 are respectively arranged on the two movable block outer modules 3 in a penetrating manner, the two second movable blocks 12 are respectively arranged at the connecting positions of the two movable block outer modules 3 and the outer module 2, the combined movable block is arranged at the connecting position of the two movable block outer modules 3 in a penetrating manner, and the combined movable block and the second movable block 12 both penetrate through the middle mould structure and the inner mould ring barrel 10; the cover plate 13 is arranged at the tops of the outer mold structure, the middle mold structure and the inner mold ring barrel 10, an outer mold ring sleeve 14 is fixedly arranged on the outer edge of the bottom of the cover plate 13, and the outer mold ring sleeve 14 is sleeved on the outer sides of the outer mold structure and the movable block structure.
The middle section wax pattern mold according to the above embodiment of the present invention, a material cavity of the mold is formed by a gap between the outer mold structure, the middle mold structure and the inner mold ring cylinder 10, wherein an inner wall of the outer mold structure is used as an outer molding surface of an outer ring of the middle section wax pattern, bottom surfaces of the first outer mold top cover 5 and the second outer mold top cover 6 are used as top molding surfaces of the outer ring of the middle section wax pattern, a bottom of the peripheral middle mold structure extends outward, an outer wall of the peripheral middle mold structure is used as an inner molding surface and a bottom molding surface of the outer ring of the middle section wax pattern, an outer wall of the loose piece structure is used as an inner molding surface of a channel of the middle section wax pattern, the outer mold structure and the middle mold structure are matched with a through hole arranged in the loose piece structure to be used as outer molding surfaces of the channel of the middle section wax pattern, a top of the inner mold ring cylinder 10 extends outward, an outer wall of the inner mold ring cylinder 10 is used as a top molding surface and an inner molding surface of the middle section wax pattern, and a bottom of the inner wall of the inner mold structure extends inward, and the inner wall of the middle mold structure of the inner ring is used as an external molding surface and a bottom molding surface of the middle section wax mold inner ring. When the mold is installed and begins to produce, the mold is placed in the material injection machine, the pressing plate of the material injection machine can tightly press the cover plate 13, the material injection nozzle of the material injection machine can inject the filling material from the material injection port, the pressing plate has enough pressure, so that the mold has enough supporting force in the vertical direction, and meanwhile, the outer side and the inner side of the mold also have enough supporting force due to the arrangement of the outer mold ring sleeve, the inserting core 15 and the inner mold ring cylinder 10; the filling material injected into the mold can be fully filled in the cavity of the mold, after the filling material is cooled, the pressing plate is lifted, and the complete middle-section wax mold can be taken out after demolding.
As shown in fig. 1 and 2, the mold base 1 is provided with a base handle 16.
The base handle 16 and the outer mold handle 17 can be conveniently grabbed and transported by an operator.
Wherein, the inner part of the inner ring cylinder 10 is provided with a core insert 15.
Wherein, the interior circle well mould structure includes three well mould movable block 18 and well mould ring section of thick bamboo 19, the top surface of well mould ring section of thick bamboo 19 is provided with three well mould reference column 20, and is three well mould movable block can pass through well mould reference column 20 quick location is installed the top of well mould ring section of thick bamboo 19.
An opening for forming a middle wax mold channel is formed in the connecting position of the middle mold ring cylinder 19 and the middle mold movable block 18, the opening is blade-shaped, so that the middle mold ring cylinder 19 needs to be demolded from the lower part of the mold, and the middle mold movable block 18 needs to be demolded from the top of the mold.
Wherein, mold base 1 is provided with location strip 21, offer on the location strip 21 and be used for the mounting groove of well mould bottom ring 7 centre of a circle location, well mould ring section of thick bamboo 19, lock pin 15, interior mould ring section of thick bamboo 10 and external mold all offer the cooperation in the structure the constant head tank of location strip form, well mould ring section of thick bamboo 19, lock pin 15, interior mould ring section of thick bamboo 10 and external mold structure pass through the installation angle is confirmed to location strip 21.
Wherein, be provided with two locating levers 22 on the mould base 1, well mould bottom ring 7 passes through locating lever 22 angular positioning is installed on mould base 1 and the mounting groove, operating personnel can pass through locating lever 22 and the quick location installation of mounting groove well mould bottom ring 7 to improve production efficiency.
As shown in fig. 4, 8 and 9, the combined movable block includes a first combined movable block 23 and a second combined movable block 24, the front end of the second combined movable block 24 is an elliptic cylinder structure, the shape of the rear end of the second combined movable block 24 is matched with the shape of the inner wall of the inner annular cylinder 10, the front end of the second combined movable block 24 passes through the inner annular cylinder 10, the rear end of the second combined movable block 24 is embedded in the inner wall of the inner annular cylinder 10, the rear end of the first combined movable block 23 is a cylindrical structure, and the front end of the first combined movable block 23 passes through the rear end of the second combined movable block 24 and passes through the insert core 15.
Because the rear end of the second combined movable block 24 is embedded in the inner wall of the inner mold ring cylinder 10, the second combined movable block 24 can only be pulled out towards the direction of the center of a circle towards the inner side, and meanwhile, because the front end of the first combined movable block 23 is inserted into the ferrule 15, when the first combined movable block 23, the second combined movable block 24 and the ferrule 15 jointly form an interlocking structure, the accuracy of a wax mold channel is ensured to be complete, the first combined movable block 23 needs to be pulled out first when demolding is needed, after the front end of the first combined movable block 23 is separated from the ferrule 15, the ferrule 15 can move freely, and after the ferrule 15 is pulled out, the second combined movable block 24 obtains a movable space pulled out backwards, and can be separated from the inner mold ring cylinder 10.
As shown in fig. 1, 3 and 6, cover plate positioning posts 25 are disposed on the top of the middle module moving block 18, and the cover plate 13 is mounted on the top surface of the middle module moving block 18 through the cover plate positioning posts 25.
Through apron reference column 25, operating personnel can install fast apron 13 improves the die holding speed, improves production efficiency.
The middle section wax pattern mold provided by the embodiment of the invention has the following specific demolding process: after the cover plate 13 and the outer mold ring sleeve 14 are released, the first combined movable block 23 obtains a moving space, the first combined movable block 23 is pulled out in a direction away from the center of the mold, meanwhile, the first combined movable block 23 and the second combined movable block 24 can be pulled out in a direction away from the center of the mold, after the first combined movable block 23 is pulled out, the inserting core 15 is released from fixation and can be separated upwards from the mold, because the inserting core 15 is not abutted, the second combined movable block 24 can be pulled out inwards from the inner side of the inner mold ring cylinder 10, then, the inner mold ring cylinder 10 can be separated upwards at the moment, after all the movable block structures are formed, the outer mold structure can be pulled out outwards, simultaneously, the three middle mold movable blocks 18 can be simultaneously released upwards, the part of the wax mold communicated with the rest mold is lifted off through the middle mold bottom ring 7, and the middle mold ring cylinder 19 is pulled out downwards from the bottom of the rest mold structure, and finally, a plurality of small and medium modules 9 are taken out inwards from the gaps of the inner ring and the outer ring of the middle-section wax mould, and the large and medium modules 8 with yielding spaces can be taken out inwards accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a middle section wax matrix mould which characterized in that includes:
a mold base;
the outer die structure is of an annular structure and comprises an outer module and two movable outer die blocks, a filling port is arranged between the two movable outer die blocks, a first outer die top cover is arranged on the inner side of the top of the outer module, and second outer die top covers are arranged on the tops of the movable outer die blocks;
the middle mold structure is arranged on the inner side of the outer mold structure and comprises an inner ring middle mold structure, a peripheral middle mold structure and a middle mold bottom ring, the peripheral middle mold structure comprises a plurality of large and medium modules and a plurality of small and medium modules, the large and medium modules and the small and medium modules are arranged at intervals, the large and medium modules and the small and medium modules are sleeved outside the inner peripheral middle mold structure, and the middle mold bottom ring is arranged at the bottom of the peripheral middle mold structure;
the inner ring cylinder is arranged on the inner side of the inner ring middle mold structure;
the movable block structure comprises two first movable blocks, two second movable blocks and a combined movable block, the two first movable blocks are respectively arranged on the two movable block outer modules in a penetrating manner, the two second movable blocks are respectively arranged at the joints of the two movable block outer modules and the two movable block outer modules, the combined movable block is arranged at the joint of the two movable block outer modules in a penetrating manner, and the combined movable block and the second movable block both penetrate through the middle die structure and the inner die ring barrel;
the cover plate is arranged at the top of the outer mold structure, the middle mold structure and the inner mold ring barrel, an outer mold ring sleeve is fixedly arranged on the outer edge of the bottom of the cover plate, and the outer mold ring sleeve is sleeved on the outer sides of the outer mold structure and the movable block structure.
2. The mid-section wax pattern mold of claim 1, wherein the mold base is provided with a base handle.
3. The mid-section wax pattern mold of claim 1, wherein outer mold handles are provided on the outer sides of the outer mold block and the movable outer mold block.
4. The mid-section wax pattern mold of claim 1, wherein an inner portion of the inner mold ring barrel is provided with a core insert.
5. The middle section wax pattern mold of claim 4, wherein the inner ring middle mold structure comprises three middle mold movable blocks and a middle mold ring barrel, and the three middle mold movable blocks are annularly arranged at the top of the middle mold ring barrel.
6. The middle section wax mold of claim 5, wherein the mold base is provided with a positioning strip, the positioning strip is provided with a mounting groove for positioning the center of the middle mold bottom ring, and the middle mold ring barrel, the ferrule, the inner mold ring barrel and the outer mold are all provided with positioning grooves matched with the positioning strip.
7. The middle section wax pattern mold according to claim 6, wherein two positioning rods are arranged on the mold base, and the middle mold bottom ring is angularly positioned and installed on the mold base and the installation groove through the positioning rods.
8. The middle section wax mold of claim 4, wherein the combined loose piece comprises a first combined loose piece and a second combined loose piece, the front end of the second combined loose piece is of an elliptic cylinder structure, the shape of the rear end of the second combined loose piece is matched with the shape of the inner wall of the inner mold ring barrel, the front end of the second combined loose piece penetrates through the inner mold ring barrel, the rear end of the second combined loose piece is embedded in the inner wall of the inner mold ring barrel, the rear end of the first combined loose piece is of a cylindrical structure, and the front end of the first combined loose piece penetrates through the rear end of the second combined loose piece and penetrates through the insert core.
9. The middle section wax mold die as claimed in claim 5, wherein the top of the middle mold moving block is provided with a cover plate positioning column, and the cover plate is mounted on the top surface of the middle mold moving block through the cover plate positioning column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831294.2A CN113560490B (en) | 2021-07-22 | 2021-07-22 | Middle section wax pattern mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831294.2A CN113560490B (en) | 2021-07-22 | 2021-07-22 | Middle section wax pattern mould |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113560490A true CN113560490A (en) | 2021-10-29 |
| CN113560490B CN113560490B (en) | 2022-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110831294.2A Active CN113560490B (en) | 2021-07-22 | 2021-07-22 | Middle section wax pattern mould |
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| Country | Link |
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| CN (1) | CN113560490B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124690A (en) * | 1993-11-02 | 1995-05-16 | Mitsubishi Materials Corp | Insert mold for forming wax pattern |
| CN204639042U (en) * | 2015-03-04 | 2015-09-16 | 成都金德荣模具有限责任公司 | Water pump mould |
| CN106945205A (en) * | 2017-03-14 | 2017-07-14 | 株洲中航动力精密铸造有限公司 | Forming die for wax pattern |
| CN107377872A (en) * | 2017-06-28 | 2017-11-24 | 株洲中航动力精密铸造有限公司 | Casing wax mould profiling die and die mould method |
| CN108723296A (en) * | 2018-05-25 | 2018-11-02 | 保定风帆精密铸造制品有限公司 | A kind of manufacturing method in Powered Propulsion stage casing peculiar to vessel |
| CN110899616A (en) * | 2019-12-10 | 2020-03-24 | 株洲凯丰实业股份有限公司 | Forming die of power turbine case wax matrix |
| CN111604477A (en) * | 2020-06-10 | 2020-09-01 | 山东鑫聚龙动力科技集团有限公司 | Manufacturing method of engine case |
-
2021
- 2021-07-22 CN CN202110831294.2A patent/CN113560490B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124690A (en) * | 1993-11-02 | 1995-05-16 | Mitsubishi Materials Corp | Insert mold for forming wax pattern |
| CN204639042U (en) * | 2015-03-04 | 2015-09-16 | 成都金德荣模具有限责任公司 | Water pump mould |
| CN106945205A (en) * | 2017-03-14 | 2017-07-14 | 株洲中航动力精密铸造有限公司 | Forming die for wax pattern |
| CN107377872A (en) * | 2017-06-28 | 2017-11-24 | 株洲中航动力精密铸造有限公司 | Casing wax mould profiling die and die mould method |
| CN108723296A (en) * | 2018-05-25 | 2018-11-02 | 保定风帆精密铸造制品有限公司 | A kind of manufacturing method in Powered Propulsion stage casing peculiar to vessel |
| CN110899616A (en) * | 2019-12-10 | 2020-03-24 | 株洲凯丰实业股份有限公司 | Forming die of power turbine case wax matrix |
| CN111604477A (en) * | 2020-06-10 | 2020-09-01 | 山东鑫聚龙动力科技集团有限公司 | Manufacturing method of engine case |
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| CN113560490B (en) | 2022-11-25 |
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