CN113172201A - Model cluster for auxiliary impeller lost foam string casting process and auxiliary impeller lost foam string casting process - Google Patents
Model cluster for auxiliary impeller lost foam string casting process and auxiliary impeller lost foam string casting process Download PDFInfo
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- CN113172201A CN113172201A CN202110465488.5A CN202110465488A CN113172201A CN 113172201 A CN113172201 A CN 113172201A CN 202110465488 A CN202110465488 A CN 202110465488A CN 113172201 A CN113172201 A CN 113172201A
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- model
- ingate
- impeller
- sprue
- lost foam
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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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a model cluster for a casting process of an auxiliary impeller lost foam cluster, which comprises a vertically arranged sprue model and a first ingate model group connected to the bottom end of the sprue model; the first ingate mould group comprises more than two ingate moulds, and the heights of the more than two ingate moulds are the same; and one end of the ingate model, which is far away from the sprue model, is connected with an auxiliary impeller model. Meanwhile, the invention also provides a casting process of the auxiliary impeller lost foam string. The invention is provided with the sprue model and more than two ingate models connected with the bottom end of the sprue model, when molten metal needs to be poured, the molten metal is poured from the top end of the sprue model, a plurality of auxiliary impeller blanks can be formed in each pouring, and the yield of the auxiliary impeller is greatly improved on the premise of ensuring simple process and environmental protection.
Description
Technical Field
The invention relates to the technical field of casting of auxiliary impellers, in particular to a model cluster for an auxiliary impeller lost foam cluster casting process. Meanwhile, the invention also relates to a casting process of the auxiliary impeller lost foam string.
Background
A slurry pump belongs to one of centrifugal pumps and is slurry conveying equipment commonly used in the industries of coal washing, chemical engineering, building and the like. Because a gap exists between the pump shell and the pump shaft, the pressure of ore pulp in the pump is increased during working, and the ore pulp can leak out through the gap. Therefore, the conventional slurry pump adopts a certain mode to carry out shaft seal, and the current common shaft seal modes comprise a packing shaft seal, an auxiliary impeller power shaft seal, a mechanical shaft seal and the like. Therefore, the auxiliary impeller of the slurry pump is one of important accessories of the slurry pump.
The auxiliary impeller dynamic seal means that an open impeller is coaxially and reversely arranged near the back surface of an impeller rear cover plate of the slurry pump. When the slurry pump works, the auxiliary impeller rotates along with the main shaft of the pump, liquid in the auxiliary impeller also rotates together, the rotating liquid generates an outward centrifugal force, the centrifugal force can reduce the medium pressure at the shaft seal to be in a normal pressure or negative pressure state, when the slurry pump stops, the auxiliary impeller also stops rotating, and the centrifugal force disappears. Besides the sealing function, the auxiliary impeller can also play a role in reducing the axial force. If the auxiliary impeller is installed, the direction of the pressure difference force of the liquid acting on the auxiliary impeller is opposite to the direction of the pressure difference force acting on the impeller, so that a part of axial force can be counteracted, and the effect of prolonging the service life of the bearing is achieved.
At present, most casting schemes for the auxiliary impeller are resin sand molding or large risers are placed in shaft holes of a lost foam, raw materials of a resin sand molding process need resin and a curing agent, the resin sand molding process and the curing agent are high in cost and contain volatile substances, and the resin sand molding process and the curing agent are not beneficial to environmental protection; the process for placing the large dead head in the shaft hole of the lost foam is simple, green and environment-friendly, but the yield is not enough.
In view of this, it is an urgent need to solve the problems of the art to develop a method for manufacturing a sub-impeller lost foam string and a mold cluster for the same.
Disclosure of Invention
In view of the above, the present invention is directed to a mold cluster for a lost foam casting process of a secondary impeller, so as to improve the yield of the secondary impeller.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a model cluster for a casting process of a vice impeller lost foam cluster comprises a vertically arranged sprue model and a first ingate model group connected to the bottom end of the sprue model; the first ingate mould group comprises more than two ingate moulds, and the heights of the more than two ingate moulds are the same; and one end of the ingate model, which is far away from the sprue model, is connected with an auxiliary impeller model.
Furthermore, an included angle between the circumferential surface of the auxiliary impeller model and the sprue model is an acute angle, and the height of the joint of the inner sprue model and the auxiliary impeller model is greater than that of the shaft hole of the auxiliary impeller model.
Furthermore, more than two of the inner runners of the model are distributed at equal intervals.
Further, a second ingate model group connected with the side surface of the sprue model is arranged between the top end and the bottom end of the sprue model and on the side surface of the sprue model; the second ingate mould group comprises more than two ingate moulds, and the heights of the more than two ingate moulds are the same; and one end of the ingate model, which is far away from the sprue model, is connected with an auxiliary impeller model.
Furthermore, the number of the second ingate model groups is more than two, and the distance between two adjacent second ingate model groups is larger than the diameter of the ingate model.
Meanwhile, the invention also provides a casting process of the auxiliary impeller lost foam string, which comprises the following steps
Step a, manufacturing the auxiliary impeller lost foam string casting process model cluster;
b, coating the model with paint, and drying after coating;
step c, embedding the dried model into a sand box and performing vacuum-pumping treatment;
and d, pouring molten metal into the sprue model until the molten metal completely replaces the auxiliary impeller model to obtain an auxiliary impeller casting.
Further, in the step b, the coating is a lost foam water-based dry powder coating, and the drying time is not less than 72 hours.
Further, in the step c, vacuumizing to 0.3-0.5 MPa.
Further, the method comprises the following steps
And e, performing pressure relief treatment on the sand box, and cooling the casting of the auxiliary impeller to obtain an auxiliary impeller blank.
Compared with the prior art, the invention has the following advantages:
1. the mould cluster for the casting process of the auxiliary impeller lost foam string is provided with a sprue model and more than two ingate models connected to the bottom end of the sprue model, when molten metal needs to be poured, the molten metal is poured from the top end of the sprue model, and the molten metal completely flows into the bottom end of the sprue model under the action of gravity; and after the molten metal reaches the bottom end, the molten metal is distributed to each auxiliary impeller model along the ingate model in the first ingate model group, and finally the molten metal replaces the auxiliary impeller model and is molded. The number of the molten metal split streams is the same as that of the ingate models, and therefore, the molten metal split streams are also the same as that of the auxiliary impeller models. Therefore, when the casting is carried out under the negative pressure, a plurality of auxiliary impeller blanks can be formed in each casting, and the yield of the auxiliary impeller is greatly improved on the premise of ensuring simple process and environmental protection.
2. The casting process of the auxiliary impeller lost foam string is not only suitable for lost foam casting of auxiliary impellers of various pump types, but also suitable for lost foam casting of small-sized thin-wall annular castings, and ensures high product quality.
3. According to the model cluster for the auxiliary impeller lost foam casting process, the angle between the circumferential surface of the auxiliary impeller model and the sprue model and the height of the joint of the ingate model and the auxiliary impeller model are larger than the height of the shaft hole of the auxiliary impeller model, so that when the model is replaced by molten metal, the flow direction of the molten metal is more convenient to control, and the forming quality of the auxiliary impeller is ensured. And the auxiliary impeller is uniformly molded by the equal-interval distribution of more than two ingates of the model, so that the molding quality of the auxiliary impeller is further improved.
4. The mould cluster for the casting process of the auxiliary impeller lost foam string is characterized in that a second ingate mould group is arranged between the top end and the bottom end of the sprue mould and on the side surface of the sprue mould. The second ingate model group and the first ingate model group are connected with a sprue model together, so that the yield of the secondary impeller can be further improved during one-time pouring operation.
5. The number of the second ingate model groups is more than two, and the distance between two adjacent second ingate model groups is larger than the diameter of the ingate model. More than two second ingate model groups and the first ingate model group are connected with one sprue model together, so that the yield of the secondary impeller can be further improved in one-time pouring operation. During practical application, the diameter of the auxiliary impeller, the number of the auxiliary impellers connected with each ingate model group and the number of the second ingate model groups can be set according to requirements, and the method is suitable for practical application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a mold cluster for a secondary impeller lost foam cluster casting process according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a connection relationship between a ingate model and a sub-impeller model in a model cluster for a sub-impeller lost foam cluster casting process according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a mold cluster for a secondary impeller lost foam cluster casting process according to embodiment 2 of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
The present embodiment relates to a mold cluster for a secondary impeller lost foam strand casting process, wherein an exemplary structure is shown in fig. 1 and 2. As can be seen from fig. 1 and 2, the cluster of patterns comprises a vertically arranged sprue pattern 1 and a first set of ingate patterns connected to the bottom end of the sprue pattern 1. When casting is performed, the top end of the sprue model 1 faces a pouring gate of molten metal. The first ingate pattern group includes more than two ingate patterns 2, and the expeller pattern 3 in fig. 1 is designed to be five, but is not limited thereto. The heights of two or more of the ingate molds 2 are the same. And one end of the ingate model 2, which is far away from the sprue model 1, is connected with an auxiliary impeller model 3. The more the number of the ingate models 2 is, the more the impeller blanks are obtained by one-time pouring.
In designing the model, first, how many impeller blanks (i.e., impeller models 3) are needed is considered. If the number of the sub-impeller models 3 required is large, the length of the ingate model 2 can be designed to be long in consideration of the diameter limit of the sub-impeller model 3, so that the first ingate model group can accommodate a large number of sub-impeller models 3 at a time. If the number of the required sub-impeller models 3 is small, the length of the ingate model 2 can be designed to be short, so that the model and the molten metal can be saved as much as possible when the lost foam casting is performed.
The device is provided with a sprue model 1 and more than two ingate models 2 connected to the bottom end of the sprue model 1, when molten metal needs to be poured, the molten metal is poured from the top end of the sprue model 1, and the molten metal completely flows into the bottom end of the sprue model 1 under the action of gravity; and after the molten metal reaches the bottom end, the molten metal is distributed to each auxiliary impeller model 3 along the ingate model 2 in the first ingate model group, and finally the molten metal replaces the auxiliary impeller model 3 and is formed. The number of the molten metal flow-dividing portions is the same as that of the ingate molds 2, and therefore, the number of the molten metal flow-dividing portions is the same as that of the sub-impeller molds 3. Therefore, when the casting is carried out under the negative pressure, a plurality of auxiliary impeller blanks can be formed in each casting, and the yield of the auxiliary impeller is greatly improved on the premise of ensuring simple process and environmental protection. In addition, the embodiment can be suitable for lost foam casting of the auxiliary impeller with various pump types, and also can be suitable for lost foam casting of small thin-wall annular castings, and the high quality of products is ensured.
In order to further increase the performance of the model cluster for the secondary impeller lost foam casting process, in one specific embodiment of the invention, an included angle between the circumferential surface of the secondary impeller model 3 and the sprue model 1 is an acute angle, and the height of the joint of the ingate model 2 and the secondary impeller model 3 is greater than the height of the shaft hole of the secondary impeller model 3, so that when the model is replaced by molten metal, the flow direction control of the molten metal is more convenient, and the forming quality of the secondary impeller is ensured.
In order to further increase the performance of the model cluster for the secondary impeller lost foam casting process, in another embodiment of the invention, more than two of the model ingates 2 are distributed at equal intervals, so that the secondary impeller is uniformly molded, and the molding quality of the secondary impeller is further improved.
Example 2
The present embodiment relates to a mold cluster for a secondary impeller lost foam cluster casting process, wherein an exemplary structure is shown in fig. 3. As can be seen from fig. 3, the model is substantially similar to the structure of example 1, except that: a second ingate mould group connected with the side surface of the sprue model 1 is arranged between the top end and the bottom end of the sprue model 1 and on the side surface of the sprue model 1; the second ingate mould group comprises more than two ingate moulds 2, and the heights of the more than two ingate moulds 2 are the same; and one end of the ingate model 2, which is far away from the sprue model 1, is connected with an auxiliary impeller model 3, so that the yield of the auxiliary impeller can be further improved during one-time pouring operation.
When molten metal needs to be poured, the molten metal is poured from the top end of the sprue model 1, and under the action of gravity, the molten metal firstly flows into the bottom end of the sprue model 1; and after the molten metal reaches the bottom end, the molten metal is distributed to each auxiliary impeller model 3 along the ingate model in the first ingate model group, and finally the molten metal replaces the auxiliary impeller model 3 and is molded. And (3) forming after the auxiliary impeller model 3 connected with the first ingate model group is replaced by molten metal, allowing the molten metal to enter the second ingate model group, and forming after the auxiliary impeller model 3 connected with the ingate model 2 in the second ingate model group is replaced by the molten metal to obtain a two-layer auxiliary impeller blank.
Preferably, the number of the second ingate model groups is more than two, and the distance between two adjacent second ingate model groups is larger than the diameter of the ingate model 2. More than two second ingate model groups and the first ingate model group are connected with one sprue model together, so that the yield of the secondary impeller can be further improved in one-time pouring operation. During practical application, the diameter of the auxiliary impeller, the number of the auxiliary impellers connected with each ingate model group and the number of the second ingate model groups can be set according to requirements, and the method is suitable for practical application. It should be noted that the diameter of the sub-impeller model 3 connected to the runner model 2 in each layer is as uniform as possible, and the diameter of the sub-impeller model 3 in each layer can be set to different values according to requirements.
Example 3
The embodiment relates to a serial casting process for a secondary impeller lost foam, which comprises the following steps
Step a, manufacturing the counter impeller lost foam cluster for the casting process in embodiment 1 or embodiment 2.
And b, coating the model with paint, and drying after coating. Preferably, the coating is a mold water-based dry powder coating, three layers of the coating are brushed, each layer is dried for 24 hours, and the total drying time is not less than 72 hours.
And c, embedding the dried model into a sand box and vacuumizing. Preferably, the vacuum is pumped to 0.3-0.5 MPa.
And d, pouring molten metal into the sprue model 1 until the molten metal completely replaces the auxiliary impeller model 3 to obtain an auxiliary impeller casting.
And e, performing pressure relief treatment on the sand box, and cooling the casting of the auxiliary impeller to obtain an auxiliary impeller blank.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A mould cluster for a casting process of a secondary impeller lost foam string is characterized in that: the model cluster comprises a vertically arranged sprue model (1) and a first ingate model group connected to the bottom end of the sprue model (1); the first ingate model group comprises more than two ingate models (2), and the heights of the more than two ingate models (2) are the same; one end of the ingate model (2) far away from the sprue model (1) is connected with an auxiliary impeller model (3).
2. The mold cluster for a secondary impeller lost foam string casting process according to claim 1, wherein: the included angle between the circumferential surface of the auxiliary impeller model (3) and the sprue model (1) is an acute angle, and the height of the joint of the inner sprue model (2) and the auxiliary impeller model (3) is greater than that of the shaft hole of the auxiliary impeller model (3).
3. The mold cluster for a secondary impeller lost foam string casting process according to claim 1, wherein: more than two of the inner pouring channels (2) of the model are distributed at equal intervals.
4. The mold cluster for a secondary impeller lost foam casting process according to any one of claims 1 to 3, wherein: a second ingate mould group connected with the side surface of the sprue model (1) is arranged between the top end and the bottom end of the sprue model (1) and on the side surface of the sprue model (1); the second ingate model group comprises more than two ingate models (2), and the heights of the more than two ingate models (2) are the same; one end of the ingate model (2) far away from the sprue model (1) is connected with an auxiliary impeller model (3).
5. The mold cluster for a secondary impeller lost foam string casting process according to claim 4, wherein: the number of the second ingate model groups is more than two, and the distance between two adjacent second ingate model groups is larger than the diameter of the ingate model (2).
6. The casting process of the auxiliary impeller lost foam string is characterized in that: comprises the following steps
Step a, manufacturing the model cluster of any one of claims 1-5;
b, coating the model with paint, and drying after coating;
step c, embedding the dried model into a sand box and performing vacuum-pumping treatment;
and d, pouring molten metal into the sprue model (1) until the molten metal completely replaces the auxiliary impeller model (3) to obtain an auxiliary impeller casting.
7. The secondary impeller lost foam string casting process of claim 6, wherein: in the step b, the coating is a lost foam water-based dry powder coating, and the drying time is not less than 72 hours.
8. The secondary impeller lost foam string casting process of claim 6, wherein: and c, vacuumizing to 0.3-0.5 MPa.
9. The secondary impeller lost foam string casting process of any one of claims 6 to 8, wherein: further comprises the following steps
And e, performing pressure relief treatment on the sand box, and cooling the casting of the auxiliary impeller to obtain an auxiliary impeller blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465488.5A CN113172201B (en) | 2021-04-28 | 2021-04-28 | Model cluster for auxiliary impeller lost foam string casting process and auxiliary impeller lost foam string casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465488.5A CN113172201B (en) | 2021-04-28 | 2021-04-28 | Model cluster for auxiliary impeller lost foam string casting process and auxiliary impeller lost foam string casting process |
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| CN113172201A true CN113172201A (en) | 2021-07-27 |
| CN113172201B CN113172201B (en) | 2022-08-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040069438A1 (en) * | 2002-10-11 | 2004-04-15 | Siak June-Sang | Lost-foam casting apparatus for improved recycling of sprue-metal |
| WO2006067990A1 (en) * | 2004-12-24 | 2006-06-29 | Sintokogio, Ltd. | Process for producing cast metal according to evaporative pattern casting |
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN205254034U (en) * | 2016-01-06 | 2016-05-25 | 淄博柴油机总公司 | Evaporative pattern casting device |
| CN112548036A (en) * | 2021-01-06 | 2021-03-26 | 洛阳佳会机械科技有限公司 | Production process for lost foam centrifugal casting |
-
2021
- 2021-04-28 CN CN202110465488.5A patent/CN113172201B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040069438A1 (en) * | 2002-10-11 | 2004-04-15 | Siak June-Sang | Lost-foam casting apparatus for improved recycling of sprue-metal |
| WO2006067990A1 (en) * | 2004-12-24 | 2006-06-29 | Sintokogio, Ltd. | Process for producing cast metal according to evaporative pattern casting |
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN205254034U (en) * | 2016-01-06 | 2016-05-25 | 淄博柴油机总公司 | Evaporative pattern casting device |
| CN112548036A (en) * | 2021-01-06 | 2021-03-26 | 洛阳佳会机械科技有限公司 | Production process for lost foam centrifugal casting |
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| CN113172201B (en) | 2022-08-26 |
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