CN112719217B - Method for blocking inner cavity of lost foam double-suction impeller mould shell - Google Patents
Method for blocking inner cavity of lost foam double-suction impeller mould shell Download PDFInfo
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- CN112719217B CN112719217B CN202011535863.0A CN202011535863A CN112719217B CN 112719217 B CN112719217 B CN 112719217B CN 202011535863 A CN202011535863 A CN 202011535863A CN 112719217 B CN112719217 B CN 112719217B
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- Prior art keywords
- mould shell
- sand
- impeller
- filling
- curing agent
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a method for blocking an inner cavity of a lost foam double-suction impeller mould shell, wherein a sealing film is adopted to seal an inlet of the impeller mould shell after the mould shell is cooled, zircon sand is poured into an outlet of the impeller mould shell for vibration compaction, a mixture of resin, a curing agent and corundum sand is filled into a remaining runner, the sealing film is removed, and the inlet of the impeller mould shell is sealed by the mixture of the resin, the curing agent and the corundum sand; the zircon sand has high density and good flow property, and can be filled in the corners of the inlet of the runner; the corundum sand is uniformly mixed by the resin and the curing agent, and the strength is high after tamping and hardening; the corundum sand which is uniformly mixed with the resin and the curing agent has good high-temperature collapsibility after being poured, so that the cavity sand can be cleaned conveniently; the invention changes the hole sealing method, reduces the rejection rate and improves the stability of the casting quality.
Description
Technical Field
The invention relates to the technical field of precision casting, in particular to a method for plugging an inner cavity of a lost foam double-suction impeller mould shell.
Background
The prior method for plugging the inner cavity of the runner after the ceramic shell lost foam precision casting impeller is roasted comprises the following steps: the impeller inner cavity runner structure is complicated, the mould shell mixes the quartz sand with the water glass in the runner inner cavity after roasting and cooling to fill the runner inner cavity, and carries out drying and hardening, and then carries out filling compaction, which has no problem for the conventional impeller, but for the double suction impeller with large diameter, narrow runner and wrap angle of more than 220 DEG, the place of the runner inlet corner is not easy to fill, the place is extremely easy to generate the clamp iron defect, the clamp iron fully blocks the blade inlet, and the casting can not be repaired and can only be scrapped.
Disclosure of Invention
The invention mainly aims to provide a method for blocking the inner cavity of a lost foam double-suction impeller mould shell, which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a method for blocking the inner cavity of a lost foam double-suction impeller mould shell comprises the following steps:
prefabricating plugging materials: uniformly mixing resin and a curing agent with corundum sand according to a certain proportion to obtain a mixture A for later use, and sieving zircon sand to remove large particles, impurities and dust for later use;
the mould shell is treated, natural cooling is carried out after the roasting of the mould shell is completed, and an impeller inlet of the mould shell is sealed by a sealing film after the cooling is finished;
pre-filling sand in a runner: filling a certain amount of zircon sand from an impeller outlet of the mould shell, and vibrating after sand filling is finished until the corner of the impeller inlet is filled;
filling a flow passage: filling the mixture A into the rest flow passage of the mould shell, and tamping by a tamping tool while filling;
and (3) sealing a mould shell: and turning the filled mould shell, removing the sealing film, and sealing the impeller inlet of the mould shell by using the mixture A.
Preferably, the ratio of the resin to the curing agent is 1:1.
Preferably, the resin is an epoxy resin and the curing agent is a polyamine curing agent.
Preferably, the tamping tool is a flat iron tool with a curvature.
Compared with the prior art, the invention has the beneficial effects that: the zircon sand has high density and good flow property, and can be filled in the corners of the inlet of the runner; the corundum sand is uniformly mixed by the resin and the curing agent, and the strength is high after tamping and hardening; the corundum sand which is uniformly mixed with the resin and the curing agent has good high-temperature collapsibility after being poured, so that the cavity sand can be cleaned conveniently; the invention changes the hole sealing method, reduces the rejection rate and improves the stability of the casting quality.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a casting system according to the present invention;
FIG. 2 is a schematic view of an impeller mold shell according to the present invention;
fig. 3 is a schematic view of a flat iron tool with camber according to the present invention.
In the figure: 1. a pouring system; 2. an impeller; 3. corundum sand uniformly mixed by resin and curing agent; 4. zircon sand; 5. an impeller outlet, 6 and blades; 7. an impeller inlet; 8. blade wrap angle; 9. a compaction table; 10. a flat iron tool with curvature.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
A method for blocking the inner cavity of a lost foam double-suction impeller mould shell comprises the following steps:
prefabricating plugging materials: uniformly mixing resin and a curing agent with corundum sand according to a certain proportion to obtain a mixture A for later use, and sieving zircon sand to remove large particles, impurities and dust for later use;
the mould shell is treated, natural cooling is carried out after the roasting of the mould shell is completed, and an impeller inlet of the mould shell is sealed by a sealing film after the cooling is finished;
pre-filling sand in a runner: filling a certain amount of zircon sand from an impeller outlet of the mould shell, and vibrating after sand filling is finished until the corner of the impeller inlet is filled;
filling a flow passage: filling the mixture A into the rest flow passage of the mould shell, and tamping by a tamping tool while filling;
and (3) sealing a mould shell: and turning the filled mould shell, removing the sealing film, and sealing the impeller inlet of the mould shell by using the mixture A.
Preferably, the ratio of the resin to the curing agent is 1:1.
Preferably, the resin is an epoxy resin and the curing agent is a polyamine curing agent.
Preferably, the tamping tool is a flat iron tool with a curvature.
As shown in fig. 1-3, the compaction structure of the inner cavity of the lost foam double-suction impeller mold shell comprises a pouring system 1, an impeller mold shell 2, corundum sand 3 uniformly mixed by resin and a curing agent, zircon sand 4, an impeller outlet 5, blades 6, an impeller inlet 7, an impeller wrap angle 8, a compaction table 9 and flat iron tools 10 with bends, wherein the pouring system 1 is connected with two sides of the impeller mold shell 2, the zircon sand 4 is poured into the impeller mold shell 2 at the impeller outlet 5, the impeller mold shell 2 and the pouring system 1 are placed on the compaction table 9 for vibration until the bend of the impeller inlet 7 is filled, after compaction, the corundum sand 3 uniformly mixed by the resin and the curing agent is filled into a residual runner of the impeller mold shell 2 and is tamped by the flat iron tools 10 with bends, and the corundum sand 3 uniformly mixed by the resin and the curing agent is used for sealing the impeller inlet 7.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (2)
1. A method for blocking the inner cavity of a lost foam double-suction impeller mould shell is characterized by comprising the following steps: the method comprises the following steps:
prefabricating plugging materials: uniformly mixing epoxy resin, polyamine curing agent and corundum sand in a ratio of 1:1 to obtain a mixture A for later use, and sieving zircon sand to remove large particles, impurities and dust for later use;
the mould shell is treated, natural cooling is carried out after the roasting of the mould shell is completed, and an impeller inlet of the mould shell is sealed by a sealing film after the cooling is finished;
pre-filling sand in a runner: filling a certain amount of zircon sand from an impeller outlet of the mould shell, and vibrating after sand filling is finished until the corner of the impeller inlet is filled;
filling a flow passage: filling the mixture A into the rest flow passage of the mould shell, and tamping by a tamping tool while filling;
and (3) sealing a mould shell: and turning the filled mould shell, removing the sealing film, and sealing the impeller inlet of the mould shell by using the mixture A.
2. The method for plugging the inner cavity of the lost foam double-suction impeller mold shell according to claim 1, which is characterized in that: the tamping tool is a flat iron tool with bending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535863.0A CN112719217B (en) | 2020-12-23 | 2020-12-23 | Method for blocking inner cavity of lost foam double-suction impeller mould shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535863.0A CN112719217B (en) | 2020-12-23 | 2020-12-23 | Method for blocking inner cavity of lost foam double-suction impeller mould shell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112719217A CN112719217A (en) | 2021-04-30 |
| CN112719217B true CN112719217B (en) | 2023-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011535863.0A Active CN112719217B (en) | 2020-12-23 | 2020-12-23 | Method for blocking inner cavity of lost foam double-suction impeller mould shell |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581319A (en) * | 2009-06-18 | 2009-11-18 | 莱芜市泰钢新材料有限责任公司 | Process for manufacturing shell of impeller of electrical pump |
| CN103128230A (en) * | 2013-03-16 | 2013-06-05 | 大连福岛精密零部件有限公司 | Precision manufacturing method of high-accuracy impellor for pump |
| CN110142380A (en) * | 2018-02-10 | 2019-08-20 | 无锡市东明冠特种金属制造有限公司 | The manufacturing method of narrow path impeller |
| CN110976772A (en) * | 2019-12-30 | 2020-04-10 | 安徽应流铸业有限公司 | Shell manufacturing method for precisely casting narrow-runner impeller |
| CN111673050A (en) * | 2020-05-19 | 2020-09-18 | 中国科学院金属研究所 | Method for filling hollow ceramic core for precision investment casting |
-
2020
- 2020-12-23 CN CN202011535863.0A patent/CN112719217B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581319A (en) * | 2009-06-18 | 2009-11-18 | 莱芜市泰钢新材料有限责任公司 | Process for manufacturing shell of impeller of electrical pump |
| CN103128230A (en) * | 2013-03-16 | 2013-06-05 | 大连福岛精密零部件有限公司 | Precision manufacturing method of high-accuracy impellor for pump |
| CN110142380A (en) * | 2018-02-10 | 2019-08-20 | 无锡市东明冠特种金属制造有限公司 | The manufacturing method of narrow path impeller |
| CN110976772A (en) * | 2019-12-30 | 2020-04-10 | 安徽应流铸业有限公司 | Shell manufacturing method for precisely casting narrow-runner impeller |
| CN111673050A (en) * | 2020-05-19 | 2020-09-18 | 中国科学院金属研究所 | Method for filling hollow ceramic core for precision investment casting |
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| Publication number | Publication date |
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| CN112719217A (en) | 2021-04-30 |
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