Casting mold and method for manufacturing large impeller
Through the combined design and specific steps of wooden mold and sand and earth casting mold, the oxide scale, shrinkage, sand hole, air hole, air hole and turbulence problems in large impeller casting are solved, and the complete casting of large thin-walled impellers is achieved, ensuring high-quality finished impeller production.
Patent Information
- Application Number
- CN202510394610.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-04
AI Technical Summary
Large impellers are prone to defects such as scale, shrinkage, sand holes, and pores during casting. During low-pressure casting, air and turbulence are prone to occur during liquid aluminum filling, resulting in the inability to successfully cast thin-wall impellers as a whole.
The combination mold design of wooden molds and sand and earth casting molds includes setting up conical connecting columns and partitions on the wooden molds, and setting up structures such as page blocks, edge blocks, inner blocks, guide bars and support columns on the sand and earth casting molds. The sand and soil are filled and the sand core are arranged through specific steps to form the shape of the impeller, and sealing blocks are set up during casting to stabilize the casting process.
It effectively avoids the defects of impeller castings, ensures the complete casting of large thin-walled impellers, solves the problems of air and turbulence during the aluminum liquid filling process, and achieves high-quality impeller molding.
Smart Images
Figure CN120243877A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of impeller equipment, and specifically to a method for manufacturing a casting mold for a large impeller and the method thereof. Background Art
[0002] The diameter of a large impeller is relatively large, and the wall of the impeller is relatively thin. Moreover, the thickness of the blade structure part of the whole impeller is relatively small, and the blade shape is three-dimensional twisted, with a complex structure. Currently, when casting a large thin-walled impeller, due to these characteristics of the impeller, defects such as oxide skin, shrinkage porosity, sand holes, and air holes are generated in the impeller casting, making the formed impeller casting unable to meet the use requirements. Currently, during the low-pressure casting process of a large impeller, due to the large size of the large impeller, the low-pressure casting is carried out under a set low pressure for filling and casting. The main difficulty lies in that since the large impeller belongs to a thin-walled part, during the filling process of the aluminum liquid, air entrapment and turbulent flow are likely to occur; in addition, due to the fast cooling speed of the aluminum liquid and the rapid reduction of fluidity, the aluminum liquid is likely to stop flowing during the flow process, and it is easy to have insufficient pouring, making it impossible to successfully cast the large thin-walled impeller as a whole; when low-pressure casting a large thin-walled impeller, compared with a common impeller, the casting is larger and the structure is more complex. From the production of the core to the casting forming, the same control method as that for the low-pressure casting of a common impeller cannot be adopted in all aspects. The casting method of a large impeller has always been a difficult problem in the industry.
[0003] In the casting process, sand core casting means that in order to obtain the structural shape and internal cavity shape of a part, the external mold structure shape and internal cavity structure shape of the part are pre-made with other materials that are easily formed, and then the sand cores are combined according to the process. Thus, a cavity with the same structural dimensions as the part is formed in the sand core, and then a fluid with fluidity is poured into this cavity. After the liquid cools and solidifies, a part with exactly the same external mold structure can be formed. Summary of the Invention
[0004] In view of the above problems, the present invention provides a method for manufacturing a casting mold for a large impeller and the method thereof, which solves the problems in the background art.
[0005] The technical solution adopted by the present invention to solve its technical problems is: A method for manufacturing a casting mold for a large impeller, including a wooden mold and a sandy soil casting mold; Concave surfaces are provided on both the upper and lower surfaces of the wooden mold. A conical connecting column is provided at the center of the concave surface on the upper surface. A plurality of evenly distributed partition plates are provided in the circumferential direction of the connecting column. A partition cavity is formed between two adjacent partition plates. A circular top plate is provided at the top end of the connecting column; The sandy soil mold includes a number of page blocks with arc-shaped outer edges that are evenly distributed circumferentially and correspond to the partition cavities. There are side blocks evenly distributed circumferentially on the outer edges of the number of page blocks, and through holes are provided on the side blocks. There are inner blocks evenly distributed circumferentially on the inner sides of the number of page blocks. The inner circle formed between the number of inner blocks corresponds to the top plate. A number of evenly distributed and crown-shaped guiding strips are provided circumferentially along the upper part of the side blocks. A support column is provided at the center of the number of guiding strips. An inner ring and an outer ring are provided from the inside to the outside along the edge of the support column. A number of evenly distributed sand blocks are provided on both the inner ring and the outer ring. A number of evenly distributed fixing blocks are provided circumferentially on the outer sides of the number of outer rings. Sealing blocks are provided on the upper parts of the number of fixing blocks.
[0006] As an optimization, the side block includes an inner side block with the same height as the page block and an outer side block with a height higher than that of the inner side block.
[0007] As an optimization, the upper surface of the inner block is provided with a slope angle.
[0008] As an optimization, a gap is provided between two adjacent guiding strips.
[0009] As an optimization, the height of the sand blocks on the inner ring is lower than the height of the sand blocks on the outer ring.
[0010] A method for manufacturing a large impeller includes the following steps: S1: Set a sand pit with appropriate dimensions; S2: Place page blocks into the partition cavity of the wooden mold. At the same time, select sandy soil mixed with organic oil, so that the sandy soil fills the voids on the wooden mold and ensure that there are no voids between the sandy soils to form the shape of the blade; S3: Place the wooden mold filled with sandy soil into the sand pit, fix it with sandy soil around, use a crane to lift out the wooden mold, and the mold at the bottom is completed; S4: On the basis of step S3, arrange the sand cores. Place side blocks around the page blocks and leave a certain gap. Set inner blocks on the inner edges of the page blocks, cover them with guiding strips, and leave gaps between the guiding strips to form the crown-shaped groove of the impeller; S5: Since the other side of the impeller is a completely hollow concave surface, which needs to occupy the pouring space, continue to place a support column, an inner ring and an outer ring on the guiding strips, place fixing blocks around the outer ring, and set iron pipes inserted on the left and right as the pouring ports; S6: To ensure the stability of pouring, set sealing blocks at the top to prevent the molten iron from flowing out. Pour the melted molten iron into the mold through the pouring ports. After cooling for a period of time and demolding, the finished impeller can be obtained. Description of the Drawings
[0011] Figure 1Schematic structural diagram of the sand casting mold of the present invention; Figure 2 Schematic structural diagram of the wooden mold of the present invention; Figure 3 is Figure 1 Schematic cross-sectional structure diagram of
[0012] Wherein: 1, connecting column; 2, partition board; 3, separation cavity; 4, top plate; 5, page block; 6, side block; 7, inner block; 8, guide bar; 9, support column; 10, fixing block; 11, sealing block; 12, iron pipe. Specific embodiments
[0013] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.
[0014] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0015] For the convenience of narration, if the words "upper", "lower", "left", and "right" appear in the present invention, they only indicate the same directions as the upper, lower, left, and right of the attached drawings themselves, and do not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.
[0016] As Figures 1-3 shown, a large impeller casting mold is manufactured, including a wooden mold and a sand casting mold; Concave surfaces are provided on both the upper and lower surfaces of the wooden mold. A conical connecting column 1 is provided at the center of the concave surface on the upper surface. A plurality of evenly distributed partition boards 2 are provided in the circumferential direction of the connecting column 1. A separation cavity 3 is formed between two adjacent partition boards 2. A circular top plate 4 is provided at the top end of the connecting column 1; The sandy soil mold includes a plurality of page blocks 5 that are circumferentially and evenly distributed and have an arc-shaped outer edge corresponding to the partition cavity 3. The outer edges of the plurality of page blocks 5 are provided with side blocks 6 that are circumferentially and evenly distributed. The side blocks 6 are provided with through holes. The inner sides of the plurality of page blocks 5 are provided with inner blocks 7 that are circumferentially and evenly distributed. The inner circle formed between the plurality of inner blocks 7 corresponds to the top plate 4. A plurality of evenly distributed and crown-shaped guide bars 8 are provided along the upper circumference of the side blocks 6. A support column 9 is provided at the center of the plurality of guide bars 8. An inner ring and an outer ring are provided from the inside to the outside along the edge of the support column 9. The inner ring and the outer ring are both provided with a plurality of evenly distributed sand blocks. A plurality of evenly distributed fixing blocks 10 are provided on the outer circumference of the plurality of outer rings. Sealing blocks 11 are provided on the upper parts of the plurality of fixing blocks 10.
[0017] The side block 6 includes an inner side block having the same height as the page block 5 and an outer side block having a height higher than that of the inner side block.
[0018] The upper surface of the inner block 7 is provided with a slope angle.
[0019] A gap is provided between two adjacent guide bars 8.
[0020] The height of the sand blocks of the inner ring is lower than the height of the sand blocks of the outer ring.
[0021] A method for manufacturing a large impeller includes the following steps: S1: Set a sand pit with appropriate dimensions; S2: Place the page blocks 5 in the partition cavity 3 of the wooden mold. At the same time, select sandy soil mixed with organic oil, so that the sandy soil fills the gaps on the wooden mold and ensure that there are no gaps between the sandy soils to form the shape of the blade; S3: Place the wooden mold filled with sandy soil into the sand pit, fix it with sandy soil around, use a crane to lift out the wooden mold, and the mold at the bottom is completed; S4: On the basis of step S3, arrange the sand cores. Place the side blocks 6 around the page blocks 5 and leave a certain gap. Set the inner blocks 7 on the inner edge of the page blocks 5, cover the guide bars 8 on them, and leave gaps between the guide bars 8 to form the crown-shaped groove of the impeller; S5: Since the other side of the impeller is a completely hollow concave surface, which needs to occupy the pouring space, continue to place the support column 9, the inner ring and the outer ring on the guide bars 8, place the fixing blocks 10 around the outer ring, and set the iron pipes 12 inserted on the left and right as the pouring ports; S6: To ensure the stability of pouring, set the sealing block 11 at the top to prevent the molten iron from flowing out. Pour the melted molten iron into the mold through the pouring port. After cooling for a period of time and demolding treatment, the finished impeller can be obtained.
[0022] The above specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product forms and styles of the above specific embodiments. Any appropriate changes or modifications made by any person of ordinary skill in the art that meet the claims of the present invention shall fall within the patent protection scope of the present invention.
Claims
1. A method for manufacturing a casting mold for a large impeller, characterized in that: It includes a wooden mold and a sand mold; Concave surfaces are provided on both the upper and lower surfaces of the wooden mold. A conical connecting column is provided at the center of the concave surface on the upper surface. A number of evenly distributed partition plates are provided in the circumferential direction of the connecting column. A separation cavity is formed between two adjacent partition plates. A circular top plate is provided at the top end of the connecting column; The sand mold includes a number of page blocks with circumferentially evenly distributed outer edges corresponding to the separation cavities and having an arc shape. Circumferentially evenly distributed edge blocks are provided on the outer edges of the number of page blocks. Through holes are provided on the edge blocks. A number of circumferentially evenly distributed inner blocks are provided on the inner sides of the number of page blocks. The inner circle formed between the number of inner blocks corresponds to the top plate. A number of evenly distributed and crown-shaped guide strips are provided in the circumferential direction along the upper part of the edge blocks. A support column is provided at the center of the number of guide strips. An inner ring and an outer ring are provided from the inside to the outside along the edge of the support column. A number of evenly distributed sand blocks are provided on both the inner ring and the outer ring. A number of circumferentially evenly distributed fixing blocks are provided on the outer sides of the number of outer rings. Sealing blocks are provided on the upper parts of the number of fixing blocks.
2. The magnetic iron filings removing device according to claim 1, characterized in that: The edge block includes an inner block with the same height as the page block and an outer block with a height higher than that of the inner block.
3. The magnetic iron filings removing device according to claim 1, characterized in that: An inclined angle is provided on the upper surface of the inner block.
4. The magnetic iron filings removing device according to claim 3, wherein: A gap is provided between two adjacent guide strips.
5. The magnetic iron filings removing device according to claim 4, characterized in that: The height of the sand blocks on the inner ring is lower than the height of the sand blocks on the outer ring.
6. A method for manufacturing a large impeller, using the large impeller casting mold described in any one of claims 1-5, characterized in that: It includes the following steps: S1: Set up a sand pit with appropriate dimensions; S2: Place the page blocks into the separation cavity of the wooden mold. At the same time, select sand mixed with organic oil, so that the sand fills the gaps on the wooden mold and ensure that there are no gaps between the sands, forming the shape of a blade; S3: Place the wooden mold filled with sand into the sand pit and fix it with sand around. Use a crane to lift out the wooden mold, and the mold at the bottom is completed; S4: On the basis of step S3, arrange the sand core. Place the edge blocks around the page blocks and leave a certain gap. Set the inner blocks on the inner edge of the page blocks and cover the guide strips on them. There are gaps between the guide strips to form the crown-shaped groove of the impeller; S5: Since the other side of the impeller is a completely hollow concave surface, which needs to occupy the pouring space, continue to place the support column, the inner ring and the outer ring on the guide strips, place the fixing blocks around the outer ring, and set iron pipes inserted on the left and right as the pouring ports; S6: In order to ensure the stability of pouring, set the sealing blocks at the uppermost part to prevent the molten iron from flowing out. Pour the melted molten iron into the mold through the pouring port. After a period of cooling and demolding treatment, the finished impeller can be obtained.