CN221018555U - Fine casting mould structure of large-diameter narrow-runner impeller - Google Patents
Fine casting mould structure of large-diameter narrow-runner impeller Download PDFInfo
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- CN221018555U CN221018555U CN202322785124.2U CN202322785124U CN221018555U CN 221018555 U CN221018555 U CN 221018555U CN 202322785124 U CN202322785124 U CN 202322785124U CN 221018555 U CN221018555 U CN 221018555U
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- 238000005266 casting Methods 0.000 title claims description 32
- 238000005495 investment casting Methods 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- 239000002002 slurry Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000003754 machining Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The utility model discloses a precision casting mould structure of a large-diameter narrow-runner impeller, which comprises a mould shell formed by removing a wax mould in a melting way and a core wrapped in the mould shell, wherein a riser cavity is formed at the upper part of the mould shell, a blade cavity is formed on the core, a plurality of support nails are arranged on the mould shell, the outer ends of the support nails are wrapped and fixed by the mould shell, and the inner ends of the support nails are abutted against the corresponding surfaces of the core.
Description
Technical Field
The utility model relates to the technical field of centrifugal pump impeller casting, in particular to a precision casting mould structure of a large-diameter narrow-runner impeller.
Background
In centrifugal pump impeller structures, impellers with large diameters, narrow flow channels and large bending degrees of the blades are difficult to cast, and if the problems exist at the same time, the difficulty of casting is multiplied. For the impeller fine casting process, an impeller wax pattern is usually manufactured firstly, then slurry hanging treatment is carried out outside the wax pattern, and in the process, the narrow flow passage outlet means that the number of slurry hanging layers inside the flow passage is limited; when the diameter is large and the blades are bent, uneven hanging occurs, and the naked eyes cannot see the hanging condition in the flow channel, so that the places which are not hung can not be repaired; the small-mouth ring and the runner are narrow, drying of slurry in the runner is greatly limited, the three aspects can lead to the situation that the strength of a core formed in the runner (the core is the runner of the impeller after sand removal and cleaning after casting) is not high enough, and then the core is broken or deformed after high-temperature baking or pouring of the shell, so that the impeller is scrapped finally, and the production is greatly influenced.
In order to reduce deformation and breakage of the core, research and development is being conducted, support nails for supporting easily broken parts (i.e., dangerous cross sections) of the core are designed to maintain the strength of the core to ensure that the core is in the correct position.
Disclosure of Invention
The utility model aims to provide a precision casting mould structure of a large-diameter narrow-runner impeller, which solves the problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a smart mould structure of narrow runner impeller of major diameter, includes the shell 7 that forms after melting the wax matrix, parcel is in core 8 in the shell 7, shell 7 upper portion is formed with riser die cavity 704, be formed with blade die cavity 703 on the core 8, be equipped with a plurality of support nails 6 on the shell 7, the outer end of support nail 6 is wrapped up fixedly by shell 7, the inner end with core 8 corresponds surface butt.
Further, the support nails 6 are arranged in pairs at dangerous cross-section positions of the core 8 according to the trend of the blade cavity 703, and two support nails 6 of each pair are symmetrically arranged relative to the core 8.
Further, a back cover plate cavity 701 and a front cover plate cavity 702 are respectively formed between two ends of the shell 7 and the core 8, the back cover plate and the front cover plate are respectively used for forming the large-diameter narrow-runner impeller after casting, the periphery of the core 8 is connected with the shell 7 into a whole, the riser cavity 704 is communicated with the back cover plate cavity 701, and the blade cavity 703 is respectively communicated with the back cover plate cavity 701 and the front cover plate cavity 702.
Further, the shell 7 further includes an air outlet hole 9 that connects the back plate cavity 701 and the riser cavity 704 in an oblique direction.
Furthermore, the material used by the support nails 6 is consistent with the material of the large-diameter narrow-runner impeller, and after casting is completed, the support nails 6 and the corresponding rear cover plate and front cover plate form metallurgical bonding.
The manufacturing method of the precision casting mould structure of the large-diameter narrow-runner impeller and the precision casting process for producing the large-diameter narrow-runner impeller by using the precision casting mould structure of the large-diameter narrow-runner impeller are as follows:
A. Designing a wax pattern three-dimensional model according to the three-dimensional digital model of the large-diameter narrow-runner impeller casting;
B. C, importing the three-dimensional digital model obtained in the step A into MAGMA software for analysis, determining the dangerous section position where the core is most easily deformed, and obtaining the position parameters required to be supported;
C. B, according to the position parameters obtained in the step B, obtaining axial dimension parameters of the impeller at the position according to the determined position, and designing dimension parameters of the support nails;
D. Preparing a support nail: c, preparing a support nail 6 by adopting raw materials with the same materials as the impeller according to the size parameters of the support nail obtained in the step C;
E. Preparing a wax mould: preparing a wax pattern by using the three-dimensional pattern parameters of the wax pattern obtained in the step A, wherein the wax pattern comprises a wax pattern back cover plate 4, a wax pattern front cover plate 5 and a wax pattern blade 3 which are connected into a whole, and the support nails 6 prepared in the step D are respectively embedded into the wax pattern back cover plate 4 and the wax pattern front cover plate 5 of the wax pattern in pairs according to the position parameters obtained in the step B, so that the inner ends of the support nails 6 are respectively flush with the inner end surfaces of the corresponding wax pattern back cover plate 4 or the wax pattern front cover plate 5, and the outer ends of the support nails 6 are respectively protruded out of the outer end surfaces of the corresponding wax pattern back cover plate 4 or the wax pattern front cover plate 5; then assembling the riser 1 and the gas outlet strip 2;
F. Preparing a shell, namely, hanging the wax mould obtained in the step E to obtain the shell containing the wax mould, wherein the outer ends of the supporting nails 6 are also wrapped by the slurry, so that the supporting nails are fixed on the prepared shell, and meanwhile, the space positions between the wax mould rear cover plate 4, the wax mould front cover plate 5 and the wax mould blades 3 are hung with the slurry to form a core 8; finally, dewaxing treatment is carried out, and a precision casting mould structure of the large-diameter narrow-flow-passage impeller is formed after the wax mould is removed; the inner ends of the support nails 6 are respectively flush with the inner end surface of the wax pattern rear cover plate 4 or the wax pattern front cover plate 5, so that the inner ends of the support nails 6 are abutted against the corresponding surface of the core 8 formed after slurry coating, and the outer ends of the support nails 6 are wrapped and fixed on the mold shell, so that the support for the core 8 is formed after the wax pattern is removed by melting and after the high-temperature roasting of the mold shell;
G. Preparing a precision casting of a large-diameter narrow-runner impeller, pouring molten steel after melting into a mold shell, and at the moment, supporting a core 8 by a supporting nail 6 on one hand, avoiding floating deformation of the core 8 under the action of the molten steel, and ensuring casting precision; the other surface is made of the same material as the impeller by the supporting nails 6, and the supporting nails 6 form metallurgical bonding when molten steel is solidified, so that the supporting nails become a part of a corresponding rear cover plate or front cover plate, and a precision casting of the large-diameter narrow-flow-passage impeller is obtained after cleaning; because the outer surface of the impeller needs machining, the part of the supporting nails protruding out of the outer surface of the corresponding rear cover plate or front cover plate can be removed in subsequent machining, subsequent other treatment is not needed, and the process is simple and convenient and has remarkable effect.
Further, in the step C, parameters of the support nail 6 include at least a diameter and a length, wherein the diameter is 5-20 mm, and the length is a thickness value of a cover plate (front cover plate or rear cover plate) at the support position+a designed shell thickness value+5-10 mm.
Further, in step E, the method for preparing the wax pattern may be prepared by 3D printing or by casting a wax solution with a metal mold in the prior art, and the support nails may be embedded by drilling holes in the prepared wax pattern and then placing the support nails for bonding with the wax solution, or by placing the support nails at a set position of the metal mold for preparing the wax pattern, and naturally embedding the support nails in the wax pattern after casting the wax pattern.
The utility model has the beneficial effects that: according to the precision casting mould structure of the large-diameter narrow-runner impeller, provided by the utility model, the supporting nails which are consistent with the impeller material are arranged to support the core, so that the deformation or fracture of the core after dewaxing, roasting and pouring is avoided, and after casting is completed, the supporting nails and the corresponding rear cover plate or front cover plate form metallurgical bonding to form a part of the corresponding rear cover plate or front cover plate, so that the integrity of the impeller cover plate structure is ensured, simplicity and practicability are realized, and the deformation or fracture preventing effect of the core is remarkably ensured, and the precision of the impeller precision casting is remarkably ensured.
Drawings
FIG. 1 is a schematic diagram of a precision casting mold according to the present utility model;
FIG. 2 is a schematic view of a wax pattern for use in making a shell according to the present utility model.
Description of the embodiments
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-2, a precision casting mold structure of a large-diameter narrow-runner impeller includes a mold shell 7 formed by melting a wax mold, and a mold core 8 wrapped in the mold shell 7, wherein a riser cavity 704 is formed at the upper part of the mold shell 7, a blade cavity 703 is formed on the mold core 8, a plurality of support nails 6 are arranged on the mold shell 7, the outer ends of the support nails 6 are wrapped and fixed by the mold shell 7, and the inner ends are abutted to corresponding surfaces of the mold core 8.
Further, the support pins 6 are arranged in pairs at dangerous cross-sectional positions of the core 8 according to the trend of the blade cavity 703, and two support pins 6 of each pair are symmetrically arranged with respect to the core 8.
Further, a back cover plate cavity 701 and a front cover plate cavity 702 are respectively formed between two ends of the shell 7 and the core 8, and are used for respectively forming a back cover plate and a front cover plate of the large-diameter narrow-runner impeller after casting, the periphery of the core 8 is connected with the shell 7 into a whole, a riser cavity 704 is communicated with the back cover plate cavity 701, and a blade cavity 703 is respectively communicated with the back cover plate cavity 701 and the front cover plate cavity 702.
Further, the mold shell 7 further comprises an air outlet hole 9 which is obliquely communicated with the back cover plate mold cavity 701 and the riser mold cavity 704.
Further, the material used for the support nails 6 is consistent with that of the large-diameter narrow-runner impeller, and after casting, the support nails 6 and the corresponding rear cover plate or front cover plate form metallurgical bonding.
Support the core 8 through setting up the support nail 6 unanimous with impeller material, avoid core 8 after dewaxing, when roasting and produce deformation or fracture when pouring to support nail 6 constitutes metallurgical bonding with corresponding back shroud or front shroud and becomes the part of corresponding back shroud or front shroud after the casting is accomplished, has guaranteed the completion of impeller shroud structure, and simple and practical prevents that core 8 warp or cracked effect from showing and has guaranteed the precision of impeller smart foundry goods.
The method for manufacturing the fine casting mold structure of the large-diameter narrow-runner impeller and the fine casting process for producing the large-diameter narrow-runner impeller by using the fine casting mold structure of the large-diameter narrow-runner impeller are now described with reference to fig. 1 and 2, and the fine casting process is as follows:
A. Designing a wax pattern three-dimensional model according to the three-dimensional digital model of the large-diameter narrow-runner impeller casting;
B. C, importing the three-dimensional digital model obtained in the step A into MAGMA software for analysis, determining the dangerous section position where the core is most easily deformed, and obtaining the position parameters required to be supported;
C. B, according to the position parameters obtained in the step B, obtaining axial dimension parameters of the impeller at the position according to the determined position, and designing dimension parameters of the support nails;
D. Preparing a support nail: c, preparing a support nail 6 by adopting raw materials with the same materials as the impeller according to the size parameters of the support nail obtained in the step C, wherein the support nail 6 can be prepared by adopting a mode of mechanical processing or casting or a combination of casting and mechanical processing;
E. Preparing a wax mould: preparing a wax pattern by using the three-dimensional pattern parameters of the wax pattern obtained in the step A, wherein the wax pattern comprises a wax pattern back cover plate 4, a wax pattern front cover plate 5 and a wax pattern blade 3 which are connected into a whole, and the support nails 6 prepared in the step D are respectively embedded into the wax pattern back cover plate 4 and the wax pattern front cover plate 5 of the wax pattern in pairs according to the position parameters obtained in the step B, so that the inner ends of the support nails 6 are respectively flush with the inner end surfaces of the corresponding wax pattern back cover plate 4 or the wax pattern front cover plate 5, and the outer ends of the support nails 6 are respectively protruded out of the outer end surfaces of the corresponding wax pattern back cover plate 4 or the wax pattern front cover plate 5; then, assembling the riser 1 and the gas outlet strip 2, wherein the riser 1, the gas outlet strip 2, the wax pattern rear cover plate 4, the wax pattern front cover plate 5 and the wax pattern blade 3 respectively form a riser cavity 704, a gas outlet hole 9, a rear cover plate cavity 701, a front cover plate cavity 702 and a blade cavity 703 after dewaxing of the shell;
F. Preparing a shell, namely, hanging the wax mould obtained in the step E to obtain the shell containing the wax mould, wherein the outer ends of the supporting nails 6 are also wrapped by the slurry, so that the supporting nails are fixed on the prepared shell, and meanwhile, the space positions between the wax mould rear cover plate 4, the wax mould front cover plate 5 and the wax mould blades 3 are hung with the slurry to form a core 8; finally, dewaxing treatment is carried out, and a precision casting mould structure of the large-diameter narrow-flow-passage impeller is formed after the wax mould is removed; the inner ends of the support nails 6 are respectively flush with the inner end surface of the wax pattern rear cover plate 4 or the wax pattern front cover plate 5, so that the inner ends of the support nails 6 are abutted against the corresponding surface of the core 8 formed after slurry coating, and the outer ends of the support nails 6 are wrapped and fixed on the mold shell, so that the support for the core 8 is formed after the wax pattern is removed by melting and after the high-temperature roasting of the mold shell;
G. Preparing a precision casting of a large-diameter narrow-runner impeller, pouring molten steel after melting into a mold shell, and at the moment, supporting a core 8 by a supporting nail 6 on one hand, avoiding floating deformation of the core 8 under the action of the molten steel, and ensuring casting precision; the other surface is made of the same material as the impeller by the supporting nails 6, and the supporting nails 6 form metallurgical bonding when molten steel is solidified, so that the supporting nails 6 become a part of a corresponding rear cover plate or front cover plate, and a precision casting of the large-diameter narrow-runner impeller is obtained after cleaning; because the outer surface of the impeller needs machining, the part of the supporting nails protruding out of the outer surface of the corresponding rear cover plate or front cover plate can be removed in subsequent machining, subsequent other treatment is not needed, and the process is simple and convenient and has remarkable effect.
Preferably, in the step C, the parameters of the support nail 6 include at least a diameter and a length, the diameter is 5-20 mm, the diameter is preferably 10mm, and the length is the thickness value of the cover plate (front cover plate or rear cover plate) at the support position+the designed shell thickness value+5-10 mm.
Preferably, in step E, the method for preparing the wax pattern may be prepared by 3D printing or casting wax liquid with a metal mold in the prior art, and the support pins 6 may be inserted by drilling holes in the prepared wax pattern and then placing the support pins 6 for bonding with the wax liquid or by placing the support pins 6 at a set position of the metal mold for preparing the wax pattern, and then naturally inserting the support pins 6 into the wax pattern after casting the wax liquid to mold the wax pattern.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a smart mould structure of narrow runner impeller of major diameter, includes shell (7) that form after melting the wax matrix, parcel are in core (8) in shell (7), shell (7) upper portion is formed with riser die cavity (704), be formed with blade die cavity (703) on core (8), its characterized in that: the mold shell (7) is provided with a plurality of support nails (6), the outer ends of the support nails (6) are wrapped and fixed by the mold shell (7), and the inner ends of the support nails are abutted to the corresponding surfaces of the mold cores (8).
2. The fine casting mold structure of the large-diameter narrow-runner impeller according to claim 1, wherein: the support nails (6) are arranged in pairs at dangerous section positions of the core (8) according to the trend of the blade cavity (703), and two support nails (6) of each pair are symmetrically arranged relative to the core (8).
3. The fine casting mold structure of the large-diameter narrow-runner impeller according to claim 2, wherein: the novel casting mold is characterized in that a back cover plate cavity (701) and a front cover plate cavity (702) are formed between the mold shell (7) and two ends of the mold core (8) respectively, the back cover plate and the front cover plate of the large-diameter narrow-runner impeller are formed after casting, the periphery of the mold core (8) is connected with the mold shell (7) into a whole, a riser cavity (704) is communicated with the back cover plate cavity (701), and the blade cavity (703) is respectively communicated with the back cover plate cavity (701) and the front cover plate cavity (702).
4. A precision casting structure for a large diameter narrow runner impeller as claimed in claim 3, wherein: the shell (7) further comprises an air outlet hole (9) which is obliquely communicated with the back cover plate cavity (701) and the riser cavity (704).
5. The fine casting mold structure of the large-diameter narrow-runner impeller according to claim 4, wherein: the material of the supporting nails (6) is consistent with that of the large-diameter narrow-runner impeller, and after casting is completed, the supporting nails (6) and the corresponding rear cover plate and front cover plate form metallurgical bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322785124.2U CN221018555U (en) | 2023-10-18 | 2023-10-18 | Fine casting mould structure of large-diameter narrow-runner impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322785124.2U CN221018555U (en) | 2023-10-18 | 2023-10-18 | Fine casting mould structure of large-diameter narrow-runner impeller |
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| Publication Number | Publication Date |
|---|---|
| CN221018555U true CN221018555U (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322785124.2U Active CN221018555U (en) | 2023-10-18 | 2023-10-18 | Fine casting mould structure of large-diameter narrow-runner impeller |
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| Country | Link |
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| CN (1) | CN221018555U (en) |
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2023
- 2023-10-18 CN CN202322785124.2U patent/CN221018555U/en active Active
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