Pouring mold, impeller and preparation method of impeller

Abstract

The invention relates to a pouring mold which comprises a mold main body, a mold cavity for pouring a film material is arranged in the mold main body, and a flexible assembly is arranged in the mold cavity, so that the poured film material is in contact with the mold main body through the flexible assembly. The mold has the beneficial effects that the flexible component for pouring the film material is arranged in the cavity, so that a product is convenient to demold, and the surface of the product is not easy to deform, thereby improving the yield; and the situations of mold deformation and corner damage caused by repeated use of the mold can be avoided, and the service life of the mold is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of casting moulds, in particular to a casting mould, an impeller and a preparation method of the impeller. Background Art

[0002] Silicon carbide resin composite ceramics are corrosion-resistant and wear-resistant, and are gradually being promoted and applied in the chemical industry.

[0003] Silicon carbide resin composite ceramics have the characteristics of low molding temperature (20-200℃) and good moldability. The use of metal mold casting can produce products with precise dimensions and smooth surfaces. However, the cured silicon carbide composite ceramics have poor yield and high surface hardness. For special-shaped molds with complex structures (such as closed impellers), metal molds often deform and break corners after repeated use, greatly shortening their service life.

[0004] For example, the impeller has a large blade curvature, and the metal blade core mold must be molded along the curvature direction. However, since the ceramic wraps the metal blade core mold very tightly after solidification, the metal mold is often damaged after forced mold removal. Summary of the invention

[0005] The present invention aims at solving the technical problems existing in the prior art and provides a casting mold, an impeller and a method for preparing the impeller.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The first aspect protects a casting mold, including a mold body, a cavity for casting a film material, and a flexible component is arranged in the cavity, so that the cast film material contacts the mold body through the flexible component.

[0008] As a further technical solution, the mold body includes an outer mold and an inner mold adapted to be connected to the outer mold, and the insertion end of the inner mold is inserted into the outer mold and forms the mold cavity with the inner wall thereof.

[0009] As a further technical solution, the flexible component includes a first flexible part sleeved on the inner wall of the outer mold and a second flexible part sleeved on the outer wall of the inner mold insertion end. The space formed by the first flexible part and the second flexible part is the mold cavity.

[0010] As a further technical solution, grooves are provided on the outer mold at locations opposite to the ends of the flexible components, so that the ends of the flexible components are placed in the grooves to be compressed.

[0011] As a further technical solution, the outer mold includes an upper mold body, a middle mold body, and a lower mold body that are adapted and connected in sequence, and the space formed by the upper mold body, the middle mold body, the lower mold body, and the inner mold is the mold cavity;

[0012] The first flexible member is sleeved on the inner wall surface of the middle mold body, and the middle mold body and the lower mold body are both provided with the groove, so that the end of the first flexible member is accommodated in the groove on the middle mold body, and the end of the second flexible member is accommodated in the groove on the lower mold body.

[0013] As a further technical solution, a pouring hole is provided on the outer mold, and the pouring hole is opposite to the mold cavity, so that the film material is injected into the mold cavity from the pouring hole.

[0014] As a further technical solution, a wear-resistant part is provided in the cavity.

[0015] As a further technical solution, the cavity is in an impeller shape or a volute shape.

[0016] The second aspect provides a method for preparing an impeller, which is prepared using the casting mold described in the first aspect, and the specific steps are:

[0017] S1, sleeve the first flexible member and the second flexible member on the outer mold and the inner mold respectively;

[0018] S2, assembling and fixing the outer mold and the inner mold so that a cavity for accommodating the casting film material is formed between the first flexible member and the second flexible member;

[0019] S3. Inject the film material into the cavity and remove the mold after it solidifies.

[0020] The third aspect protects an impeller prepared using the method of the second aspect.

[0021] The beneficial effects of the present invention are:

[0022] 1. A flexible component for casting film material is set in the cavity, which is convenient for product demoulding and its surface is not easy to deform, thereby improving the yield rate; it can avoid the occurrence of mold deformation and corner damage caused by repeated use of the mold, and extend the service life of the mold;

[0023] 2. The first flexible part, the second flexible part and other structures constitute the cavity for injecting the film material. Combined with the design of the groove structure, the flexible component is fixed more stably, and displacement and wrinkles are avoided to make the shape size more accurate; at the same time, the damage of the product caused by collision and wear is reduced during the process of mold disassembly and demolding, which further improves the service life of the mold and reduces the production cost;

[0024] 3. The design of wear-resistant parts in the cavity prevents the wear-resistant parts or molds from being damaged due to extrusion and collision during the assembly process, thus improving the erosion resistance of the product and further increasing the service life of the product while controlling production costs;

[0025] 4. The impeller is prepared by using the mold of the present invention. Due to the structural design of the flexible components and the outer mold, it is convenient to disassemble and assemble, has a high yield rate and low cost;

[0026] 5. This mold structure can replace the urea core mold to manufacture special-shaped structural parts and protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the top view of the structure of Embodiment 1 of the present invention;

[0028] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure from the middle AA perspective;

[0029] Figure 3 for Figure 2 The enlarged structural diagram at position I in the middle;

[0030] Figure 4 It is a schematic diagram of a part of the structure of the embodiment 1 provided with a wear-resistant part from the AA perspective;

[0031] Figure 5 This is an enlarged schematic diagram of part of the structure after removing the upper mold body and the inner mold body according to Example 1 of the present invention.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] Outer mold 1, casting hole 11, groove 12, upper mold body 13, riser 131, lower mold body 14, outer middle mold body 15, blade core body 16, upper blade core body 161, lower blade core body 162;

[0034] Inner mold 2, cavity 21, wear-resistant part 22; first flexible part 3, second flexible part 4;

[0035] Skeleton 5, shaft head positioning piece 6, shaft hole positioning block 7, film material 8, balance pin 9. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0037] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0038] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0039] Example 1

[0040] This embodiment is to solve the problem that the mold is easily deformed and the corners are damaged during the mold removal process, and to increase the service life of the mold. Figure 2 , Figure 5 , a casting mold is provided, including a mold body, a cavity 21 for casting a film material 8, and a flexible component is provided in the cavity 21, so that the cast film material 8 contacts the mold body through the flexible component, and the mold is not easily deformed or the corners are damaged during demolding; it can be explained that at this time, the flexible component can be partially or completely set in the cavity 21, and the product here is a product after casting and curing, such as an impeller, a volute, etc.

[0041] For example, the film material 8 is a silicon carbide resin composite ceramic, and the cavity 21 is in the shape of an impeller or a volute; and in order to increase the service life of the prepared impeller or volute, a wear-resistant part is provided in the cavity 21, and the size of the wear-resistant part is selected according to actual needs.

[0042] In the specific implementation process, for the convenience of disassembly and assembly, see Figure 1 , Figure 2, the mold body includes an outer mold 1, and an inner mold 2 adapted to be connected to the outer mold 1, and the insertion end of the inner mold 2 is inserted into the outer mold 1 and the inner wall thereof to form the mold cavity 21. At the same time, the flexible component includes a first flexible member 3 sleeved on the inner wall of the outer mold 1, and a second flexible member 4 sleeved on the outer wall of the insertion end of the inner mold 2, and the space formed by the first flexible member 3 and the second flexible member 4 is the mold cavity 21. That is, at this time, there is a gap between the opposite surfaces of the outer mold 1 and the inner mold 2, and the shape formed by the gap is the space for casting the film material 8, so as to obtain the shape of the product.

[0043] For example, the material of the first flexible member 3 and the second flexible member 4 needs to be resistant to high temperatures of 100° C., and have elasticity and a certain degree of softness, such as silicone, rubber, and the like.

[0044] Specifically, the outer mold 1 is provided with a pouring hole 11, and the pouring hole 11 is opposite to the mold cavity 21, so that the film material 8 is injected into the mold cavity 21 from the pouring hole 11. According to actual needs, the pouring hole 11 can be provided at the top or bottom of the outer mold 1.

[0045] In the specific implementation process, see Figure 3 In order to improve the stability of the flexible component and avoid wrinkles that affect product quality, the outer mold 1 is provided with grooves 12 at locations opposite to the ends of the flexible component, so that the ends of the flexible component are placed in the grooves 12 to be pressed. It can be explained that the ends here can be the two ends of the flexible component.

[0046] In the specific implementation process, see Figure 2 , Figure 4 The outer mold 1 includes an upper mold body 13, an intermediate mold body, and a lower mold body 14 that are sequentially adapted and connected, and the space formed by the upper mold body 13, the intermediate mold body, the lower mold body 14, and the inner mold 2 is the mold cavity 21; the first flexible member 3 is sleeved on the inner wall surface of the intermediate mold body, and the intermediate mold body and the lower mold body 14 are both provided with the groove 12, so that the end of the first flexible member 3 is accommodated in the groove 12 on the intermediate mold body, and the end of the second flexible member 4 is accommodated in the groove 12 on the lower mold body 14.

[0047] For example, it also includes a skeleton 5 disposed in the mold cavity 21, and the skeleton 5 has the same structure as the mold cavity 21 or has the same structure as part of the mold cavity 21;

[0048] For example, when the product is an impeller, the shape of the cavity 21 is an impeller shape, and the specific structure is as follows:

[0049] The upper mold body 13, the middle mold body, and the lower mold body 14 are all annular structures, and the upper mold body 13 is sealed and fixed by the shaft head positioning piece 6, the inner mold 2 is sequentially inserted into the annular structure formed by the lower mold body 14, the middle mold body, and the upper mold body 13, and the top of the inner mold 2 is pressed and fixed by the shaft hole positioning block 7;

[0050] The skeleton 5 is an impeller metal skeleton 5, which is sleeved on the shaft hole positioning block 7, and its top end is detachably connected to the lower end of the shaft head positioning piece 6 (for example, a latch connection), so that the impeller metal skeleton 5 is at least partially located in the mold cavity 21, and after casting, the surface of the impeller metal skeleton 5 has a solidified film material 8; at this time, the gap between the outer surface of the impeller metal skeleton 5 and the upper mold body 13 is also a part of the mold cavity 21; the gap between the lower mold body 14 and the first flexible part 3 and the second flexible part 4 is also a part of the mold cavity 21. The shaft hole positioning block 7 and the shaft head positioning piece 6 are used to fix the position of the impeller metal skeleton 5;

[0051] It should be noted that: according to actual conditions, the shape of the impeller metal skeleton 5 can be the same as the structure of the cavity 21, that is, it extends into the entire cavity 21 (not shown in the figure).

[0052] To adapt to the impeller structure, see Figure 2 , a plurality of balancing pins 9 pass through the holes along the circumferential direction of the impeller metal skeleton 5, so that the top end of the balancing pin 9 is connected to the shaft head positioning member 6, and the bottom end passes through the second flexible member 4 and is connected to the intermediate mold body, so that after casting, a plurality of balancing holes are formed on the product; at this time, the inner mold 2 can be a plum blossom core structure, and the intermediate mold body includes an outer intermediate mold body 15 and a blade core body 16 adapted thereto, and the first flexible member 3 is sleeved on the blade core body 16; the groove 12 on the intermediate mold body is opened on the blade core body 16, more specifically, the groove 12 is opened on the upper and lower ends of the blade core body 16, the groove 12 at the upper end of the blade core body 16 is arranged at the bottom end abutting the upper mold body 13, and the groove 12 at the lower end of the blade core body 16 is arranged at the top end abutting the lower mold body 14;

[0053] To facilitate demoulding, the blade core 16 includes an upper blade core 161 and a lower blade core 162 adapted to be connected to the upper blade core 161, and each blade in the upper blade core 161 is adapted to be connected to each blade in the lower blade core 162 to form a complete blade shape. It can be explained that the grooves 12 opened at the upper and lower ends of the blade core 16 are respectively located in the upper blade core 161 and the lower blade core 162.

[0054] In this embodiment, the pouring hole 11 can be provided on the upper mold body 13 or on the lower mold body 14, but no matter it is provided on the upper mold body 13 or the lower mold body 14, it must be connected to the mold cavity 21. The upper mold body 13 is provided with a plurality of risers 131 along its circumferential direction, and the risers 131 are connected to the mold cavity 21.

[0055] In this specific embodiment, the installation is achieved in the following manner:

[0056] After the film material 8 is poured and cooled, the shaft head positioning member 6, the upper mold, the lower mold, the shaft hole positioning block 7, the lower mold body 14, the outer middle mold body 15, the upper blade core body 161, the lower blade core body 162, and the first flexible member 3 are removed in sequence.

[0057] The design of the flexible component in the mold structure of this embodiment facilitates product demoulding and its surface is not easily deformed, thereby improving the yield rate; avoiding mold deformation and corner damage caused by repeated use of the mold, thereby extending the service life of the mold.

[0058] Example 2

[0059] A method for preparing an impeller is provided, which is prepared using the casting mold as in Example 1, and the specific steps are as follows:

[0060] S1, sleeve the first flexible member 3 and the second flexible member 4 on the outer mold 1 and the inner mold 2 respectively;

[0061] At this time, the elastic effect of the first flexible member 3 and the lubrication effect in the mold can be used as a buffer layer between the precast ceramic product and the skeleton 5, solving the problem of no yield after the ceramic solidifies, and playing a role in protecting the mold;

[0062] S2, assembling and fixing the outer mold 1 and the inner mold 2 so that a cavity 21 for accommodating the casting film material 8 is formed between the first flexible member 3 and the second flexible member 4;

[0063] Due to the material characteristics of the first flexible member 3 and the second flexible member 4, the damage caused by collision and friction between the mold and the ceramic during the later disassembly process is reduced, the service life of the mold is increased, and the production cost is reduced.

[0064] In this process, the service life of the impeller can be increased by embedding wear-resistant parts 22 on the impeller blades (i.e., the wear-resistant parts 22 are placed in the cavity 21 during the assembly process). Since both sides of the blades are wrapped with flexible materials, the wear-resistant parts 22 will not break during the assembly and vibration process.

[0065] S3, injecting the film material 8 into the mold cavity 21 and removing the mold after it solidifies.

[0066] In the specific operation, in step S1, the first flexible member 3 and the second flexible member 4 are respectively sleeved on the blade core 16 and the plum blossom core; in this process, the plum blossom core and the blade core 16 are both made of metal. At this time, the plum blossom core and the blade core 16 made of metal respectively support the second flexible member 4 and the first flexible member 3 to achieve the shape and size requirements of the mold design;

[0067] In step S2, the assembly process is:

[0068] 1. Fix the shaft hole positioning block 7 on the plum blossom core after step S1, and set the lower mold at the lower part outside the plum blossom core;

[0069] 2. The impeller frame 5 is sleeved outside the shaft hole positioning block 7;

[0070] 3. After the blade core 16 obtained in step S1 is connected to the lower mold body 14, the outer intermediate mold body 15 is installed, and then the upper mold body 13 and the shaft head positioning member 6 are installed in sequence;

[0071] In this process, the shaft head positioning member 6 and the shaft hole positioning block 7 cooperate to fix the position of the impeller skeleton 5 .

[0072] In step S3, the pouring and mold taking process is:

[0073] 1. Pour the carbonized resin composite ceramic into the cavity 21 from the pouring hole 11 and wait for the ceramic to solidify;

[0074] 2. The mold removal sequence is: first remove the shaft head positioning piece 6 and the upper mold body 13; then remove the plum blossom core of the second flexible piece 4, the shaft hole positioning block 7, and the lower mold body 14 in turn; finally, remove the outer middle mold body 15, the upper blade core body 161, the lower blade core body 162, and the first flexible piece 3;

[0075] During this process, the plum blossom core is directly pulled downward (such as Figure 2 Perspective), then take the second flexible member 4;

[0076] In the impeller preparation method of this embodiment, due to the mold structure design, the mold assembly and disassembly processes are convenient and simple, and the mold parts will not be damaged, thereby increasing the service life of the mold. At the same time, the impeller preparation process is simpler and faster, and there is no need to worry about damaging the mold or product during assembly or disassembly.

[0077] Example 3

[0078] This embodiment protects an impeller, which is prepared using the method of Example 2.

[0079] The impeller has a high yield rate and, due to the structural design of the wear parts, the service life of the impeller is greatly improved.

[0080] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0082] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A casting mold, characterized in that: The mold body comprises a mold cavity (21) for casting a film material, and a flexible component is arranged in the mold cavity (21), so that the cast film material contacts the mold body through the flexible component.

2. A casting mold according to claim 1, characterized in that: The mold body comprises an outer mold (1) and an inner mold (2) adapted to be connected to the outer mold (1); the insertion end of the inner mold (2) is inserted into the outer mold (1) to form the mold cavity (21) between the inner wall thereof.

3. A casting mold according to claim 2, characterized in that: The flexible component comprises a first flexible member (3) sleeved on the inner wall of the outer mold (1) and a second flexible member (4) sleeved on the outer wall of the insertion end of the inner mold (2); the space formed by the first flexible member (3) and the second flexible member (4) is the mold cavity (21).

4. A casting mold according to claim 3, characterized in that: The outer mold (1) is provided with grooves (12) at locations opposite to the ends of the flexible components, so that the ends of the flexible components are placed in the grooves (12) to be pressed tightly.

5. A casting mold according to claim 4, characterized in that: The outer mold (1) comprises an upper mold body (13), an intermediate mold body, and a lower mold body (14) which are sequentially adapted and connected, and the space formed among the upper mold body (13), the intermediate mold body, the lower mold body (14), and the inner mold (2) is the mold cavity (21); The first flexible member (3) is sleeved on the inner wall surface of the middle mold body, and the middle mold body and the lower mold body (14) are both provided with the groove (12), so that the end of the first flexible member (3) is accommodated in the groove (12) on the middle mold body, and the end of the second flexible member (4) is accommodated in the groove (12) on the lower mold body (14).

6. A casting mold according to claim 2, characterized in that: The outer mold (1) is provided with a pouring hole (11), and the pouring hole (11) is opposite to the mold cavity (21), so that the film material is injected into the mold cavity (21) from the pouring hole (11).

7. A casting mold according to claim 1, characterized in that: A wear-resistant part (22) is arranged in the mold cavity (21).

8. A casting mold according to any one of claims 1 to 7, characterized in that: The mold cavity (21) is in the shape of an impeller or a volute.

9. A method for preparing an impeller, characterized in that: The casting mold is prepared using the casting mold as claimed in claims 3-7, and the specific steps are as follows: S1, sleeve the first flexible member (3) and the second flexible member (4) on the outer mold (1) and the inner mold (2) respectively; S2, assembling and fixing the outer mold (1) and the inner mold (2) so that a cavity (21) for accommodating the casting film material (8) is formed between the first flexible member (3) and the second flexible member (4); S3, injecting the film material (8) into the mold cavity (21) and removing the mold after it solidifies.

10. An impeller, characterized in that: Prepared by the method of claim 9.

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