CN110976772A - Shell manufacturing method for precisely casting narrow-runner impeller - Google Patents
Shell manufacturing method for precisely casting narrow-runner impeller Download PDFInfo
- Publication number
- CN110976772A CN110976772A CN201911388092.4A CN201911388092A CN110976772A CN 110976772 A CN110976772 A CN 110976772A CN 201911388092 A CN201911388092 A CN 201911388092A CN 110976772 A CN110976772 A CN 110976772A
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- Prior art keywords
- runner
- sand
- mullite
- layer
- slurry
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- 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
Abstract
The invention discloses a shell manufacturing method for precisely casting a narrow-runner impeller, which comprises the following steps: 1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying; 2) in the shell making procedure, zirconium powder slurry is used for the surface layer and the second layer; 3) spreading mullite powder slurry for the three and four layers and spreading 30-60 meshes of mullite sand; 4) sealing holes after the four layers; 5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry; 6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner. The invention adopts the zirconium powder slurry which is easy to sand, thereby not only reducing the cost and improving the yield, but also avoiding the reduction of the production efficiency caused by the difficulty in sand cleaning of the ceramic core.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a shell manufacturing method for precisely casting a narrow-runner impeller.
Background
The impeller is a key part of a water pump and is generally divided into an open impeller, a semi-open impeller, a closed impeller and the like, the closed impeller has smaller width and larger diameter along with the change of the width of an impeller flow channel, the casting difficulty is higher, the requirements on each process are higher, particularly, the defects of iron inclusion, steel leakage and the like are easily generated in the shell manufacturing process, and the impeller is used for conveying liquid such as water, oil and the like, has smooth surface finish, and therefore, the flow channel part is required to be flat and smooth without the defects of scabbing and the like.
At present, a ceramic core is mainly selected for molding, an integral ceramic core needs to be manufactured, then the ceramic core is placed in a wax mold for molding, and the ceramic core is easy to break in a cavity due to high mold locking and wax injection pressures; in addition, the mode of bonding the ceramic cores by the upper cover plate and the lower cover plate is adopted, nondestructive detection is needed after the wax piece is bonded with the ceramic cores, the shells can be manufactured only after the wax piece is qualified, the shell manufacturing material is inconsistent with the shrinkage of the ceramic cores, and the free ends of the ceramic cores are arranged, so that the ceramic cores are easy to break during dewaxing or smelting; the cost price of the ceramic core is high, some of the ceramic core is even higher than the sale price of the product, the wax mold is difficult to form, and the sand removal difficulty of the cast is large after pouring.
Disclosure of Invention
The invention provides a shell manufacturing method for precisely casting a narrow-runner impeller, which can effectively solve the technical problems mentioned in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a shell manufacturing method for precisely casting a narrow-runner impeller comprises the following steps:
1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying;
2) in the shell making procedure, zirconium powder slurry is used for a surface layer and a second layer, 80-120-mesh zircon sand is scattered, the viscosity of the slurry is 40-45 seconds, the zircon sand is screened before each layer of operation, sand grains are removed, the surface layer is dried for 8-12 hours, and whether the corner of the inner cavity of the flow passage is completely dried is checked by a fine iron wire before the second layer of operation;
3) spreading 30-60 mesh mullite sand in the third and fourth layers of mullite powder slurry, sieving the mullite before each layer of operation, removing sand grains, controlling the viscosity to be 12-14 seconds, and drying each layer for 22-26 hours;
4) sealing holes after the four layers, pouring zirconium powder slurry into a runner, checking whether bridging exists in an inner cavity of the runner, blowing floating sand in the runner away, wetting the runner, preparing semi-hard slurry by taking the zirconium powder slurry and mullite sand according to the mass ratio of 3:7, plugging a water inlet, putting the zirconium powder slurry into a flow cup, slowly pouring the zirconium powder slurry into the inner cavity of the runner, tamping while shaking, calming for 2-3 minutes, sealing a water outlet of the runner by using the semi-hard slurry, and spraying 30-60-mesh mullite on the edge of the water outlet in order to prevent the edge of the water outlet from cracking;
5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry;
6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner.
Preferably, in step 3), three and four layers are slurried with mullite powders, and the mullite is sieved prior to each layer.
Preferably, in the step 4), after 2 minutes of sedation, the water outlet of the runner is sealed by using semi-hard slurry, and 50-60-mesh mullite is sprinkled on the edge of the water outlet.
Preferably, in step 4), the inner cavity of the runner is checked for bridging by using a steel saw blade or a thin iron wire, floating sand in the runner is blown off by using an air gun, and the runner is wetted by using silica sol.
Compared with the prior art, the invention has the beneficial effects that:
the zirconium powder slurry is poured into the narrow-runner impeller runner, so that the strength of the shell can be improved, the casting defects of fire running, core breaking, iron clamping and the like after pouring are overcome, and the yield of the casting is greatly improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a shell manufacturing method for precisely casting a narrow-runner impeller comprises the following steps:
1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying;
2) in the shell making procedure, zirconium powder slurry is used for a surface layer and a second layer, 80-120-mesh zircon sand is scattered, the viscosity of the slurry is 40-45 seconds, the zircon sand is screened before each layer of operation, sand grains are removed, the surface layer is dried for 8-12 hours, and whether the corner of the inner cavity of the flow passage is completely dried is checked by a fine iron wire before the second layer of operation;
3) spreading 30-60 mesh mullite sand in the third and fourth layers of mullite powder slurry, sieving the mullite before each layer of operation, removing sand grains, controlling the viscosity to be 12-14 seconds, and drying each layer for 22-26 hours;
4) sealing holes after the four layers, pouring zirconium powder slurry into a runner, checking whether bridging exists in an inner cavity of the runner, blowing floating sand in the runner away, wetting the runner, preparing semi-hard slurry by taking the zirconium powder slurry and mullite sand according to the mass ratio of 3:7, plugging a water inlet, putting the zirconium powder slurry into a flow cup, slowly pouring the zirconium powder slurry into the inner cavity of the runner, tamping while shaking, calming for 2-3 minutes, sealing a water outlet of the runner by using the semi-hard slurry, and spraying 30-60-mesh mullite on the edge of the water outlet in order to prevent the edge of the water outlet from cracking;
5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry;
6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner.
Example two:
a shell manufacturing method for precisely casting a narrow-runner impeller comprises the following steps:
1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying;
2) in the shell making procedure, zirconium powder slurry is used for a surface layer and a second layer, 100-mesh and 120-mesh zircon sand is scattered, the viscosity of the slurry is 40-45 seconds, the zircon sand is screened before each layer of operation, sand grain groups are removed, the surface layer is dried for 10 hours, and a fine iron wire is used for checking whether the corner of the inner cavity of the runner is completely dried before the second layer of operation;
3) spreading mullite sand of 40-50 meshes by using the mullite powder slurry for the three layers and the four layers, sieving the mullite before the operation of each layer, removing sand grains, controlling the viscosity to be 13-14 seconds, and drying each layer for 24 hours;
4) sealing holes after the four layers, pouring zirconium powder slurry into a runner, checking whether bridging exists in an inner cavity of the runner, blowing floating sand in the runner away, wetting the runner, preparing semi-hard slurry by taking the zirconium powder slurry and mullite sand according to the mass ratio of 3:7, plugging a water inlet, putting the zirconium powder slurry into a flow cup, slowly pouring the zirconium powder slurry into the inner cavity of the runner, tamping while shaking, calming for 2-3 minutes, sealing a water outlet of the runner by using the semi-hard slurry, and spraying 30-60-mesh mullite on the edge of the water outlet in order to prevent the edge of the water outlet from cracking;
5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry;
6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner.
Example three:
a shell manufacturing method for precisely casting a narrow-runner impeller comprises the following steps:
1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying;
2) in the shell making procedure, zirconium powder slurry is used for a surface layer and a second layer, 80-120-mesh zircon sand is scattered, the viscosity of the slurry is 40-45 seconds, the zircon sand is screened before each layer of operation, sand grains are removed, the surface layer is dried for 8-12 hours, and whether the corner of the inner cavity of the flow passage is completely dried is checked by a fine iron wire before the second layer of operation;
3) spreading 30-60 mesh mullite sand in the third and fourth layers of mullite powder slurry, sieving the mullite before each layer of operation, removing sand grains, controlling the viscosity to be 12-14 seconds, and drying each layer for 22-26 hours;
4) sealing holes after four layers, pouring zirconium powder slurry into a runner, checking whether a bridge is built in an inner cavity of the runner by using a steel saw blade or a fine iron wire, blowing floating sand in the runner by using an air gun, wetting the runner by using silica sol, preparing semi-hard slurry by using the zirconium powder slurry and mullite sand according to the mass ratio of 3:7, plugging water inlets, slowly pouring the zirconium powder slurry into the inner cavity of the runner, pouring while shaking, tamping, calming for 2 minutes, sealing a water outlet of the runner by using the semi-hard slurry, and spraying 50-60-mesh mullite on the edge of the water outlet;
5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry;
6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner.
The zirconium powder slurry is poured into the narrow-runner impeller runner, so that the strength of the shell can be improved, the casting defects of fire running, core breaking, iron clamping and the like after pouring are overcome, and the yield of the casting is greatly improved.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (5)
1. A shell manufacturing method for precisely casting a narrow-runner impeller is characterized by comprising the following steps:
1) cleaning the impeller which is qualified in assembly welding by using a cleaning agent, removing a release agent on the surface of the wax mould, and transferring to a shell making process after drying;
2) in the shell making procedure, zirconium powder slurry is used for a surface layer and a second layer, 80-120-mesh zircon sand is scattered, the viscosity of the slurry is 40-45 seconds, the zircon sand is screened before each layer of operation, sand grains are removed, the surface layer is dried for 8-12 hours, and whether the corner of the inner cavity of the flow passage is completely dried is checked by a fine iron wire before the second layer of operation;
3) spreading 30-60 mesh mullite sand in the third and fourth layers of mullite powder slurry, sieving the mullite before each layer of operation, removing sand grains, controlling the viscosity to be 12-14 seconds, and drying each layer for 22-26 hours;
4) sealing holes after the four layers, pouring zirconium powder slurry into a runner, checking whether bridging exists in an inner cavity of the runner, blowing floating sand in the runner away, wetting the runner, preparing semi-hard slurry by taking the zirconium powder slurry and mullite sand according to the mass ratio of 3:7, plugging a water inlet, putting the zirconium powder slurry into a flow cup, slowly pouring the zirconium powder slurry into the inner cavity of the runner, tamping while shaking, calming for 2-3 minutes, sealing a water outlet of the runner by using the semi-hard slurry, and spraying 30-60-mesh mullite on the edge of the water outlet in order to prevent the edge of the water outlet from cracking;
5) drying the mixture facing a fan for a circle after hole sealing, completely hardening the inner cavity of the flow channel, and spreading 16-30-mesh mullite on the reinforcing layer to prevent 7 layers of sand from falling off and then sealing slurry;
6) and (4) filling zirconium powder slurry into the narrow-runner impeller runner.
2. The method for manufacturing the shell of the precision casting narrow-runner impeller according to claim 1, wherein the method comprises the following steps: in step 2), 100-mesh and 120-mesh zircon sand is scattered, and the surface layer is dried for 10 hours.
3. The method for manufacturing the shell of the precision casting narrow-runner impeller according to claim 1, wherein the method comprises the following steps: in the step 3), the three layers and the four layers are made of mullite powder slurry, 40-50 meshes of mullite sand are scattered, the mullite is sieved before each layer is operated, the viscosity is controlled to be 13-14 seconds, and each layer is dried for 24 hours.
4. The method for manufacturing the shell of the precision casting narrow-runner impeller according to claim 1, wherein the method comprises the following steps: in the step 4), after calming for 2 minutes, sealing the water outlet of the flow passage by using semi-hard slurry, and scattering 50-60-mesh mullite on the edge of the water outlet.
5. The method for manufacturing the shell of the precision casting narrow-runner impeller according to claim 1, wherein the method comprises the following steps: in the step 4), whether bridging exists in the inner cavity of the runner is checked by using a steel saw blade or a thin iron wire, floating sand in the runner is blown off by using an air gun, and the runner is wetted by using silica sol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911388092.4A CN110976772A (en) | 2019-12-30 | 2019-12-30 | Shell manufacturing method for precisely casting narrow-runner impeller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911388092.4A CN110976772A (en) | 2019-12-30 | 2019-12-30 | Shell manufacturing method for precisely casting narrow-runner impeller |
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| CN110976772A true CN110976772A (en) | 2020-04-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
| CN112719217A (en) * | 2020-12-23 | 2021-04-30 | 安徽应流铸业有限公司 | Plugging method for inner cavity of lost foam double-suction impeller mould shell |
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| CN109202019A (en) * | 2018-11-16 | 2019-01-15 | 襄阳五二五泵业有限公司 | A kind of moulding process casting double shrouded wheel |
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2019
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Patent Citations (5)
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| CN101480697A (en) * | 2008-01-11 | 2009-07-15 | 上海中洲特种合金材料有限公司 | Case-making method of silicasol investment casting with elongated hole structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
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Application publication date: 20200410 |
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