Die for preparing impeller main body

Abstract

The utility model discloses a mold for preparing an impeller main body. The mold comprises a bottom plate, a top plate, a forming main body, an outer forming body, an insertion piece insert and a guide column, a through hole is formed in the center of the top plate and is parallel to the bottom plate; the lower end of the forming main body is connected with the bottom plate; the upper end of the forming main body is inserted into the through hole; the outer forming body is located between the bottom plate and the top plate and located on the outer side of the forming main body, a cavity used for forming an impeller main body is formed between the outer forming body and the forming main body, and a material injection opening communicated with the cavity is formed in the upper end of the forming main body; the insertion piece insert is located in the cavity and detachably connected with the forming body. The multiple guide columns penetrate through the bottom plate, the outer forming body and the top plate at the same time, and the outer forming body and the top plate can slide in the length direction of the guide columns. High-precision and high-efficiency forming of the impeller body is achieved, and the tensile strength and the bending strength of the impeller body are improved.

Description

A mold for preparing the impeller body Technical Field

[0001] This utility model relates to the field of shipbuilding technology, specifically to a mold for preparing the impeller body. Background Technology

[0002] Currently, the mold forming technology for yacht impeller bodies has the following shortcomings:

[0003] 1. Traditional molds mostly use an integral cavity, and the impeller body and blades need to be molded separately and then assembled, resulting in poor precision and low bonding strength at the connection between the blades and the body;

[0004] 2. Existing molds rely on a single bolt or pin for positioning. When the mold is closed, the bottom plate, top plate and molding body are prone to displacement, causing deviations in the dimensions of the impeller body (such as blade installation angle deviations exceeding ±2°), affecting the dynamic balance performance of the impeller and resulting in poor reliability of the positioning system.

[0005] 3. The lack of a modular structure with reserved blade positions requires subsequent machining to remove excess material, increasing process costs and easily damaging the main structure;

[0006] 4. Currently, the integrated or non-modular design of molds results in long assembly and disassembly times, leading to low mold assembly and disassembly efficiency, inconvenient maintenance, and difficulty in meeting the needs of mass production. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a mold for manufacturing impeller bodies that features a modular structure, precise positioning, and compatibility with the properties of composite materials.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A mold for preparing an impeller body includes a base plate, a top plate, a forming body, an outer forming body, a blade insert, and guide posts. The top plate has a through hole at its center and is parallel to the base plate. The lower end of the forming body is connected to the base plate, and the upper end of the forming body is inserted into the through hole. The outer forming body is located between the base plate and the top plate and outside the forming body, forming a cavity for forming the impeller body. The upper end of the forming body has a filling port communicating with the cavity. The blade insert is located inside the cavity and is detachably connected to the forming body. Multiple guide posts simultaneously penetrate the base plate, the outer forming body, and the top plate, and the outer forming body and the top plate can slide along the length of the guide posts. The upper end of the base plate has multiple exhaust channels that communicate the cavity with the outside.

[0010] In some embodiments, the outer wall of the molded body is provided with a plurality of slots, the number of insert pieces is equal to the number of slots, and one end of the insert piece is inserted into the corresponding slot.

[0011] In some embodiments, the insert has a first mounting hole, and the slot has a first threaded hole corresponding to the first mounting hole. The insert is connected to the molded body by a bolt located in the first mounting hole.

[0012] In some embodiments, the number of inserts is three.

[0013] In some embodiments, a recessed groove is provided at the top center of the base plate, and the lower end of the molded body is embedded in the recessed groove.

[0014] In some embodiments, the base plate is provided with a plurality of second mounting holes communicating with the sink, and the lower end of the molding body is provided with a second threaded hole corresponding to the second mounting hole. The molding body is fixedly connected to the base plate by bolts located in the second mounting hole.

[0015] In some embodiments, the outermost end of the insert is in close contact with the outer molded body.

[0016] In some embodiments, the outer diameter and inner diameter of the cavity gradually increase from top to bottom.

[0017] In some embodiments, the cross-section of the exhaust channel is a semi-circle with a diameter of 1 to 3 mm.

[0018] Compared with the prior art, this utility model achieves high-precision and high-efficiency forming of the impeller body, which is conducive to improving the connection accuracy and mechanical properties of the impeller body and blades; moreover, the material distribution of the resulting impeller body is highly uniform, which is conducive to improving the tensile strength and bending strength of the impeller body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a perspective view of an embodiment of the present invention.

[0021] Figure 2 is a cross-sectional view of an embodiment of the present invention.

[0022] Figures 3a and 3b are perspective views of the molded main body in an embodiment of this utility model.

[0023] Figures 4a and 4b are perspective views of the insert piece in an embodiment of this utility model.

[0024] Figure 5 is a schematic diagram of the insert and the molded body after being connected in an embodiment of this utility model.

[0025] Figure 6 is a cross-sectional view of the outer molded body in an embodiment of this utility model.

[0026] Figure 7 is a structural diagram of the base plate in an embodiment of this utility model.

[0027] The annotations in the attached figures are explained as follows:

[0028] In the diagram: 1. Base plate; 11. Sink; 12. Second mounting hole; 13. Vent channel; 2. Top plate; 21. Through hole; 3. Molding body; 31. Injection port; 32. Slot; 33. First threaded hole; 34. Second threaded hole; 4. Outer molding body; 41. Conical groove; 5. Insert insert; 51. First mounting hole; 6. Guide post; 7. Cavity. Detailed Implementation

[0029] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0030] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0031] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0033] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0034] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0036] Referring to Figures 1-7, this utility model provides a mold for preparing an impeller body, which includes a base plate 1, a top plate 2, a molding body 3, an outer molding body 4, inserts 5, and guide pillars 6. The top plate 2 is parallel to the base plate 1, and a circular through hole 21 is provided in the center of the top plate 2. The molding body 3 is located entirely between the base plate 1 and the top plate 2, and the lower end of the molding body 3 is detachably connected to the base plate 1, while the upper end of the molding body 3 is inserted into the through hole 21. The outer molding body 4 is located between the base plate 1 and the top plate 2 and is located outside the molding body 3. The molded body 4 and the molded main body 3 form a cavity 7 for forming the impeller body. The shape of the cavity 7 is designed according to the shape of the yacht impeller body. The upper end of the molded main body 3 is provided with an injection port 31 that communicates with the cavity 7. The injection port 31 is used to connect a pressure pump to inject the mixture of reinforcing resin and fiber into the cavity 7. The insert 5 is located in the cavity 7 and is detachably connected to the molded main body 3. Multiple guide posts 6 pass through the bottom plate 1, the outer molded body 4 and the top plate 2 at the same time. The outer molded body 4 and the top plate 2 can slide along the length direction of the guide posts 6.

[0037] The base plate 1 in this invention is made of high-strength alloy material, possessing excellent strength and stability, and capable of withstanding various pressures during mold operation. In practical implementation, bolt holes can be provided on the base plate 1, allowing it to be securely fixed to the forming platform, ensuring the mold does not shift or shake during operation. The surfaces of the forming body 3 and the outer forming body 4 that constitute the cavity 7 are precisely machined according to the shape of the yacht impeller body, with a surface roughness Ra≤0.8μm. This high precision ensures a smooth surface and accurate dimensions for the formed impeller body.

[0038] As shown in Figure 6, a conical groove 41 is provided in the middle of the outer molding body 4. After the mold is closed, the top plate 2, the outer molding body 4 and the bottom plate 1 define a closed composite material casting space to prevent material leakage during the casting process.

[0039] In this embodiment, there are four guide pillars 6, each perpendicular to the base plate 1. The guide pillars 6 are made of GCr15 bearing steel with a hardness of HRC58-62, exhibiting high strength and wear resistance. The main function of the guide pillars 6 is to provide precise positioning guidance for the various components of the mold. In this embodiment, the top plate 2, the outer molding body 4, and the base plate 1 are each provided with four guide holes for the insertion of the guide pillars 6. The fitting accuracy between the guide pillars 6 and the guide holes reaches H7 / g6. During mold closing, the top plate 2 slides along the guide pillars 6, ensuring accurate alignment of the top plate 2, the outer molding body 4, and the molding body 3. This effectively avoids displacement deviations of the mold components during the mold closing process, guaranteeing the molding accuracy of the impeller body.

[0040] Referring to Figure 3a, the injection port 31 in this embodiment is carefully designed to be located at the top of the molding body 3. Positioning the injection port 31 at the top of the molding body 3 facilitates the injection of the resin-fiber mixture into the cavity 7 from top to bottom using a pressure pump after mold closing. The injection port 31 adopts a circular pipe structure. For the mold used in this invention to manufacture the yacht impeller body, the inner diameter of the injection port 31 is between 3 and 5 millimeters to ensure smooth material flow into the mold while maintaining a certain injection pressure.

[0041] Referring to Figures 3a and 3b, the outer wall of the molded body 3 in this invention has three slots 32. The number of insert pieces 5 is equal to the number of slots 32, and one end of the insert piece 5 is inserted into the corresponding slot 32. The number of slots 32 on the molded body 3 in this invention corresponds to the number of blades on the yacht impeller; therefore, in some embodiments, the number of slots 32 on the molded body 3 can be more than three. The dimensions, positions, and angles of the aforementioned slots 32 are precisely designed according to the installation requirements of the impeller blades, and the installation angles of the slots 32 and the impeller blades are strictly matched. The presence of the slots 32 provides a precise installation position for the insert pieces 5, ensuring the stability and accuracy of the insert pieces 5 after installation.

[0042] In practical implementation, to achieve a detachable connection between the insert 5 and the molding body 3, the insert 5 is provided with a first mounting hole 51 for bolts to pass through, and the slot 32 is provided with a first threaded hole 33 corresponding to the first mounting hole 51. The insert 5 is connected to the molding body 3 by a bolt (not shown in the figure) located in the first mounting hole 51. The insert 5 is made of Cr12MoV tool steel with a hard chrome plated surface, which gives it high strength and good wear resistance. The cross-sectional profile of the insert 5 is completely consistent with the root of the impeller blade. During mold operation, the main function of the insert 5 is to reserve the installation position of the impeller blade, guide the uniform distribution of material during composite material injection, and form a transition connection structure between the impeller body and the blade after molding, thereby enhancing the connection strength.

[0043] The aforementioned connection method between the insert 5 and the molding body 3 facilitates the installation and disassembly of the insert 5 while ensuring its positional accuracy during mold operation. After installation, the insert 5 precisely reserves the installation space for the impeller blades. During the composite material injection process, the insert 5, molding body 3, and outer molding body 4 jointly guide the flow of material, enabling the reinforcing resin and fibers to uniformly fill the cavity 7 used to form the impeller body, especially the blade pre-reserved position, thereby ensuring the quality and accuracy of the connection between the impeller body and the blades.

[0044] Referring to Figure 7, the bottom plate 1 of this invention has a recessed groove 11 at its top center. The lower end of the molding body 3 is embedded in the recessed groove 11. The groove can improve the positioning accuracy of the molding body 3. In order to achieve a detachable connection between the molding body 3 and the bottom plate 1, the bottom plate 1 has three second mounting holes 12 communicating with the recessed groove 11. The lower end of the molding body 3 has a second threaded hole 34 corresponding to the second mounting holes 12. The molding body 3 is fixedly connected to the bottom plate 1 by bolts (not shown in the figure) located in the second mounting holes 12.

[0045] In this invention, the outermost end of the insert 5 is in close contact with the outer molded body 4. After casting, the position of the insert 5 forms a space for the blade connection part to be inserted. As shown in Figure 2, the outer diameter and inner diameter of the cavity 7 gradually increase from top to bottom, and the shape of the cavity 7 is approximately an inverted funnel shape.

[0046] In this invention, the upper end of the base plate 1 is provided with multiple exhaust channels 13 that connect the cavity 7 to the outside. The cross-section of the exhaust channels 13 is a semi-circle with a diameter of 1-3 mm. As shown in Figure 7, the four exhaust channels 13 are radially distributed on the top of the base plate 1. The exhaust channels 13 are used to connect to an external vacuum system to discharge air bubbles generated during the filling process, ensuring dense filling of the composite material and improving the molding quality of the impeller body. In other embodiments, the exhaust channels 13 can also be designed as narrow slit structures.

[0047] In this invention, the injection port 31 is connected to a pressure pump via a high-strength pipe. The connection uses a well-sealing joint, such as a threaded seal or a compression fitting, to prevent material leakage during injection. During operation, the pressure pump injects the mixed material into the injection port 31 at a certain pressure. The composite material overcomes the resistance inside the mold and evenly fills all corners of the cavity 7, especially the blade positions reserved in the insert 5. Using higher pressure allows the material to better penetrate between the fibers, enhancing the density and mechanical properties of the composite material.

[0048] Furthermore, during operation, the exhaust channel 13 is connected to a vacuum device via a pipe. Before the composite material is poured into the mold, the vacuum device is activated to create a certain degree of vacuum inside the mold. During the pouring process, as the composite material gradually fills the cavity 7, the air and other gases inside the cavity 7 are forced towards the exhaust channel 13 and extracted by the vacuum system. This vacuuming process continues until the composite material completely fills the cavity 7 inside the mold, ensuring that there are no residual air bubbles inside the mold, thereby improving the density and molding quality of the composite material.

[0049] The presence of the venting channel 13 in this invention is crucial for eliminating air bubbles within the mold. During the composite material injection process, if the gas within the mold cannot be expelled in time, air bubbles will form inside the impeller body. These bubbles will severely affect the mechanical properties of the impeller body, such as reducing its tensile strength and flexural strength, and may even lead to safety issues such as impeller rupture during high-speed rotation. This invention, by setting the venting channel 13 and cooperating with a vacuum system, can effectively expel air bubbles, improving the quality and reliability of the resulting impeller body. Furthermore, the design of the venting channel 13 in this invention can also influence the curing process of the composite material; its good venting effect helps the composite material cure more uniformly, further improving the performance of the impeller body.

[0050] It should also be noted that the proper design and stable operation of the injection port 31 in this invention directly affects the molding quality of the impeller body, determining the injection speed and uniformity of the composite material. If the injection port 31 is improperly positioned or the pressure is not properly controlled, uneven material distribution within the mold may occur, leading to localized accumulation or insufficient filling, thus affecting the strength and dynamic balance of the impeller body. For example, if the injection speed is too fast, turbulence may form within the mold, causing air bubbles to be incorporated; if the injection pressure is insufficient, the material may not be able to fully fill some delicate structural areas, resulting in molding defects.

[0051] The mold for preparing the impeller body provided by this utility model has the following advantages:

[0052] 1. Significantly improved molding accuracy: The angular deviation of the blades installed on the impeller body position is controlled from ±2° of the traditional mold to within ±0.5°, and the radial dimension accuracy deviation of the impeller body is ≤±0.1mm, meeting the high-precision dynamic balance requirements of yacht impellers;

[0053] 2. Improved material distribution uniformity: The insert 5 and the outer molding 4 work together to form a flow channel, reducing the fiber volume fraction deviation from ±8% to ±3%, increasing the tensile strength of the impeller body by 20% and the bending strength by 15%.

[0054] 3. Improved production efficiency: The four guide pillars and six quick positioning mechanisms, along with the modular assembly and disassembly structure, reduce the single mold closing / demolding time by 40% and improve mold maintenance efficiency by 50%.

[0055] 4. Enhanced positioning stability: The fit accuracy between the guide post 6 and the guide hole reaches H7 / g6, and the overall mold wobbling amplitude is <0.1mm, effectively avoiding displacement deformation during the curing process of composite materials.

[0056] The embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0057] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A mold for preparing an impeller body, characterized in that, include: A base plate; a top plate having a through hole in its center and parallel to the base plate; a molding body having its lower end connected to the base plate and its upper end inserted into the through hole; an outer molding body located between the base plate and the top plate and outside the molding body, the outer molding body and the molding body forming a cavity for forming the impeller body, the upper end of the molding body having an injection port communicating with the cavity; an insert piece located within the cavity and detachably connected to the molding body; and guide posts, a plurality of guide posts simultaneously penetrating the base plate, the outer molding body and the top plate, the outer molding body and the top plate being slidable along the length of the guide posts; wherein, the upper end of the base plate has a plurality of exhaust channels communicating the cavity with the outside.

2. The mold for preparing the impeller body according to claim 1, characterized in that: The outer wall of the molded body is provided with multiple slots, and the number of insert pieces is equal to the number of slots. One end of each insert piece is inserted into the corresponding slot.

3. The mold for preparing the impeller body according to claim 2, characterized in that: The insert has a first mounting hole, and the slot has a first threaded hole corresponding to the first mounting hole. The insert is connected to the molded body by a bolt located in the first mounting hole.

4. The mold for preparing the impeller body according to claim 3, characterized in that: The number of insert pieces is three.

5. The mold for preparing the impeller body according to claim 1, characterized in that: The bottom plate has a recessed groove at the top center, and the lower end of the molded body is embedded in the recessed groove.

6. The mold for preparing the impeller body according to claim 5, characterized in that: The base plate is provided with a plurality of second mounting holes communicating with the settling tank, and the lower end of the molding body is provided with a second threaded hole corresponding to the second mounting holes. The molding body is fixedly connected to the base plate by bolts located in the second mounting holes.

7. The mold for preparing the impeller body according to any one of claims 1 to 6, characterized in that: The outermost end of the insert is in close contact with the outer molded body.

8. The mold for preparing the impeller body according to any one of claims 1 to 6, characterized in that: The outer and inner diameters of the cavity gradually increase from top to bottom.

9. The mold for preparing the impeller body according to any one of claims 1 to 6, characterized in that: The cross-section of the exhaust channel is a semi-circle with a diameter of 1 to 3 mm.

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