Die for preparing impeller blade

Abstract

The utility model discloses a mould for manufacturing impeller blades, which comprises an upper forming body, a lower forming body and a guide pillar, the lower end of the upper forming body is provided with a first forming surface, the first forming surface is provided with a first forming groove and a first flow guide groove surrounding the first forming groove, and the upper forming body is provided with a first guide hole; a second forming surface is arranged at the upper end of the lower forming body, a second forming groove and a second flow guide groove surrounding the second forming groove are formed in the second forming surface, and a second guide hole is formed in the lower forming body; guide columns are arranged in the first guide holes, and one ends of the guide columns extend into the second guide holes; the second forming face is attached to the first forming face, the second forming groove and the first forming groove form a blade forming cavity, and the second flow guide groove and the first flow guide groove form a flow guide cavity. According to the utility model, the discharge rate of bubbles in the manufacturing process of the impeller blade is improved, so that the mechanical property of the manufactured impeller blade is improved and the service life is prolonged.

Description

A mold for manufacturing impeller blades Technical Field

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

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

[0003] 1. Insufficient molding precision: Traditional molds are mostly integral or simple split structures, relying on manual positioning and mold closing, resulting in large deviations in the dimensions of the blade molding cavity (such as blade profile error exceeding ±0.3mm), uneven blade thickness, and affecting the overall dynamic balance performance of the impeller.

[0004] 2. Low bubble removal efficiency: Lacking a professional venting structure, the air is only vented naturally through the gap between the molds, resulting in a bubble residue rate of over 20%, which leads to looseness inside the blades and a reduction in tensile strength of over 15%. Summary of the Invention

[0005] One of the technical problems this application aims to solve is the low bubble removal efficiency of traditional mold forming technology for yacht impeller blades.

[0006] To address the shortcomings of existing technologies, this invention provides a mold for preparing impeller blades.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A mold for manufacturing impeller blades includes an upper molding body, a lower molding body, and guide pillars. The lower end of the upper molding body has a first molding surface, a first molding groove, and a first guide groove surrounding the first molding groove. The upper molding body has multiple first guide holes penetrating its upper and lower ends. The upper end of the lower molding body has a second molding surface, a second molding groove, and a second guide groove surrounding the second molding groove. The lower molding body has multiple second guide holes penetrating its upper and lower ends, with each second guide hole corresponding to a first guide hole. Each first guide hole contains a guide pillar, one end of which extends into the second guide hole. The second molding surface is in contact with the first molding surface, and the second molding groove and the first molding groove form a blade molding cavity, while the second guide groove and the first guide groove form a guide cavity.

[0009] In some embodiments, both the front and rear ends of the upper and lower molded bodies are provided with fixing grooves.

[0010] In some embodiments, the fixing groove is elongated and extends perpendicularly to the guide post, and the depth of the fixing groove is 10-15 mm.

[0011] In some embodiments, the cross-section of the flow guide cavity is circular.

[0012] In some embodiments, the diameter of the flow channel is 5 mm.

[0013] In some embodiments, the minimum distance between the flow guide cavity and the blade forming cavity is 6 mm.

[0014] In some embodiments, the first forming groove includes an interconnected first groove and a second groove, the second forming groove includes an interconnected third groove and a fourth groove, the depth of the second groove is greater than that of the first groove, the depth of the fourth groove is greater than that of the third groove, and the depths of the first groove and the third groove are equal at all positions.

[0015] In some embodiments, the number of first guide holes is four, the upper end face of the upper molded body and the lower end face of the lower molded body are both rectangular, and the four first guide holes are respectively distributed at the four corners of the top of the upper molded body.

[0016] Compared with the prior art, the guide cavity around the blade forming cavity in this invention, combined with the press application process, increases the bubble removal rate from 80% to over 95%, reduces the internal defect rate of the blade by 60%, and increases the density by 12%. Moreover, this invention can achieve uniform pressure transmission and dense material filling, increasing the tensile strength of the blade by 25% (from 200MPa to 250MPa), the bending strength by 20%, and extending the fatigue life by 30%. Attached Figure Description

[0017] 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 embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a perspective view of an embodiment of the present invention.

[0019] Figure 2 is a front view of an embodiment of this utility model.

[0020] Figure 3 is a rear view of an embodiment of the present invention.

[0021] Figure 4 is a cross-sectional view along line AA in Figure 2.

[0022] Figure 5a is a perspective view of the upper molded body in an embodiment of this utility model.

[0023] Figure 5b is a bottom view of the upper molded body in an embodiment of this utility model.

[0024] Figure 6a is a perspective view of the lower molded body in an embodiment of this utility model.

[0025] Figure 6b is a bottom view of the lower molded body in an embodiment of this utility model.

[0026] Figure 7 is a structural diagram of the impeller blades obtained in an embodiment of this utility model.

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

[0028] In the figure: 1. Upper molded body; 11. First molding surface; 12. First molding groove; 121. First groove; 122. Second groove; 13. First guide groove; 14. First guide hole; 2. Lower molded body; 21. Second molding surface; 22. Second molding groove; 221. Third groove; 222. Fourth groove; 23. Second guide groove; 24. Second guide hole; 3. Guide post; 4. Blade; 41. Body part; 42. Connecting part; 5. Blade molding cavity; 6. Guide cavity; 7. Fixing groove. 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 impeller blades, which mainly consists of an upper molding body 1, a lower molding body 2 and a guide post 3.

[0037] As shown in Figures 5a and 5b, the lower end of the upper forming body 1 is provided with a first forming surface 11, on which a first forming groove 12 and a first guide groove 13 surrounding the first forming groove 12 are provided. The upper forming body 1 is provided with a plurality of first guide holes 14 penetrating its upper and lower ends. The upper forming body 1 is machined from high-strength mold steel (718H), and the surface roughness Ra of the first forming groove 12 is ≤0.8μm, thereby ensuring the accuracy of the upper surface of the blade 4.

[0038] As shown in Figures 6a and 6b, the upper end of the lower molded body 2 is provided with a second molding surface 21. The second molding surface 21 has a second molding groove 22 and a second guide groove 23 surrounding the second molding groove 22. The lower molded body 2 has multiple second guide holes 24 penetrating its upper and lower ends, with the positions of the second guide holes 24 corresponding one-to-one with the first guide holes 14. The number of the aforementioned second guide holes 24 is equal to the number of the first guide holes 14. Both the second guide holes 24 and the first guide holes 14 are circular holes with equal diameters. The lower molded body 2 is also machined from high-strength mold steel (718H), and the surface roughness Ra of the second molding groove 22 is ≤0.8μm to ensure the accuracy of the lower surface of the blade 4.

[0039] Referring to Figure 1, each of the first guide holes 14 is provided with a guide post 3, one end of which extends into the second guide hole 24. The number of guide posts 3 is equal to the number of the first guide holes 14. The guide posts 3 are made of GCr15 bearing steel with a surface hardness of HRC60±2 and a diameter tolerance of ±0.01mm. The fitting accuracy between the guide posts 3 and the first guide hole 14 and the second guide hole 24 is H7 / g6. The second forming surface 21 is in contact with the first forming surface 11, and the second forming groove 22 and the first forming groove 12 form a blade forming cavity 5. The shape of the blade forming cavity 5 is designed according to the yacht impeller blade 4. The second guide groove 23 and the first guide groove 13 form a guide cavity 6 surrounding the blade forming cavity 5.

[0040] In use, the upper molding body 1 is connected to the upper pressure plate of the press, and the lower molding body 2 is connected to the lower pressure plate of the press. Reinforcing resin-impregnated composite fibers (such as glass fiber or carbon fiber) are laid layer by layer in the second molding groove 22 of the lower molding body 2. The laid composite fibers are compacted with a scraper to ensure they are flat and wrinkle-free. Then, the upper molding body 1 is slowly lowered along the guide post 3, so that the first molding groove 12 on the upper molding body 1 and the second molding groove 22 on the lower molding body 2 form the blade forming cavity 5. During the mold closing process, multiple guide posts 3 and guide holes form a rigid guide, ensuring that the vertical alignment error of the blade forming cavity 5 is ≤ ±0.05mm. After mold closing, pressure is maintained for a certain period of time under a certain pressure. During this period, the guide cavity 6 guides excess air bubbles and resin to be discharged, preventing air bubble retention. Finally, the upper molding body 1 is lifted, and the molded blade 4 is removed.

[0041] In this invention, both the upper molding body 1 and the lower molding body 2 have a fixing groove 7 at their front and rear ends. In specific implementation, the fixing groove is elongated and extends perpendicularly to the guide post 3, with a depth of 10-15mm. The fixing groove on the upper molding body 1 engages with a boss on the upper pressure plate of the press, and the fixing groove on the lower molding body 2 engages with a boss on the lower pressure plate of the press, and are fixed by pressure plate bolts. This ensures that the upper molding body 1 remains stable and does not shift during pressure application, and each fixing groove can withstand a pressure of over 50kN, ensuring the overall rigidity of the mold during pressure application.

[0042] In this invention, the cross-section of the guide cavity 6 is circular, and the diameter of the guide cavity 6 is 5mm. Designing the cross-section of the guide cavity 6 as circular not only facilitates mold processing but also allows excess resin to flow within the guide cavity 6, thereby promoting the discharge of excess resin. During the fabrication of the blade 4 using the mold provided by this invention for preparing impeller blades, the guide cavity 6 can utilize pressure difference to guide the directional discharge of air bubbles, effectively solving the problem of air bubble residue present in traditional molds. It is worth noting that in this invention, when the upper molding body 1 and the lower molding body 2 are closed, there is a gap between the first molding surface 11 and the second molding surface 21 that connects the blade forming cavity 5 and the guide cavity 6, thereby ensuring that excess resin can be discharged into the guide cavity 6.

[0043] In this invention, the minimum distance between the flow guiding cavity 6 and the blade forming cavity 5 is 6mm, thereby further reducing the bubble residue rate of the product and improving the tensile strength of the blade 4. Referring to Figures 5b and 6b, the first flow guiding groove 13 is equidistantly surrounding the outer periphery of the first forming groove 12, and the second flow guiding groove 23 is equidistantly surrounding the outer periphery of the second forming groove 22.

[0044] In this invention, the first forming groove 12 includes an interconnected first groove 121 and a second groove 122, and the second forming groove 22 includes an interconnected third groove 221 and a fourth groove 222. The depth of the second groove 122 is greater than that of the first groove 121, and the depth of the fourth groove 222 is greater than that of the third groove 221. The depths of the first groove 121 and the third groove 221 are equal at all positions. As shown in Figure 7, each blade 4 is composed of an interconnected main body 41 and a connecting part 42. The space formed by the first groove 121 and the third groove 221 is used to form the main body 41 of the blade 4, and the space formed by the second groove 122 and the fourth groove 222 is used to form the connecting part 42 of the blade 4.

[0045] Referring to Figure 1, in this utility model, there are four first guide holes 14. The upper end face of the upper molded body 1 and the lower end face of the lower molded body 2 are both rectangular. The four first guide holes 14 are respectively distributed at the four corners of the top of the upper molded body 1.

[0046] The mold for preparing impeller blades 4 provided by this utility model has the following advantages:

[0047] 1. Positioning is achieved through four guide pillars 3, so that the mold closing error of the upper molding body 1 and the lower molding body 2 is ≤ ±0.05mm, and the profile error of the prepared blade 4 is reduced from ±0.3mm to ±0.1mm. The prepared blade 4 meets the requirements of high-precision fluid dynamics.

[0048] 2. The guide cavity 6 around the blade forming cavity 5, in conjunction with the press application process, increases the bubble discharge rate from 80% to over 95%, resulting in a 60% reduction in the internal defect rate and a 12% increase in density of the blade 4.

[0049] 3. This mold can achieve uniform pressure transmission and dense material filling, which increases the tensile strength of the blade by 25% (from 200MPa to 250MPa), the bending strength by 20%, and the fatigue life by 30%.

[0050] 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.

[0051] 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 impeller blades, characterized in that, include: An upper molded body has a first molding surface at its lower end, a first molding groove and a first guide groove surrounding the first molding groove, and a plurality of first guide holes penetrating its upper and lower ends; a lower molded body has a second molding surface at its upper end, a second molding groove and a second guide groove surrounding the second molding groove, and a plurality of second guide holes penetrating its upper and lower ends, the second guide holes corresponding one-to-one with the first guide holes; and guide posts, each of the first guide holes having a guide post inside it, one end of the guide post extending into the second guide hole; wherein, the second molding surface is in contact with the first molding surface, and the second molding groove and the first molding groove form a blade forming cavity, and the second guide groove and the first guide groove form a guide cavity.

2. The mold for preparing impeller blades according to claim 1, characterized in that: Both the upper molded body and the lower molded body have fixing grooves at their front and rear ends.

3. The mold for preparing impeller blades according to claim 2, characterized in that: The fixing groove is elongated and extends perpendicularly to the guide post, and the depth of the fixing groove is 10-15mm.

4. The mold for preparing impeller blades according to claim 1, characterized in that: The cross-section of the flow guide cavity is circular.

5. The mold for preparing impeller blades according to claim 4, characterized in that: The diameter of the flow guiding cavity is 5mm.

6. The mold for preparing impeller blades according to claim 1, characterized in that: The minimum distance between the flow guide cavity and the blade forming cavity is 6mm.

7. The mold for preparing impeller blades according to claim 1, characterized in that: The first forming groove includes an interconnected first groove and a second groove, and the second forming groove includes an interconnected third groove and a fourth groove. The depth of the second groove is greater than that of the first groove, the depth of the fourth groove is greater than that of the third groove, and the depths of the first groove and the third groove are equal at all positions.

8. The mold for preparing impeller blades according to claim 1, characterized in that: The number of the first guide holes is four. The upper end face of the upper molded body and the lower end face of the lower molded body are both rectangular. The four first guide holes are respectively distributed at the four corners of the top of the upper molded body.

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