Impeller pouring fired mold structure

Abstract

The utility model relates to an impeller pouring fired mold structure which comprises an impeller wax mold, a pouring mold head wax mold and a ferrule wax mold, the impeller wax mold comprises a blade part and a hub part, and the bottom of the pouring mold head wax mold is connected with the hub part on one side of the impeller wax mold; the ferrule wax mold is located on the other side of the impeller wax mold, and the side edges of the blade parts of the ferrule wax mold are connected. In the utility model, the blade part of the impeller wax mould is integrated with the ferrule, so that the impeller wax mould is also integrated with the shell mould of the impeller after the shell is manufactured to form the shell mould, and the steel body of the ferrule and the steel body of the impeller are also integrated after pouring, so that the blade deformation or the shape and position out-of-tolerance caused by temperature difference stress in the pouring cooling and heat treatment processes can be effectively prevented; and the impeller casting quality is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of impeller casting, in particular to a pouring investment casting structure for an impeller.

Background Art

[0002] Investment casting, also known as lost-wax casting, can cast castings with high dimensional accuracy, high surface finish and complex shapes. For example, the impeller of a water pump generally adopts investment casting.

[0003] The impeller is the core component of a water pump and is the main factor affecting work efficiency. Common impellers are usually cast or welded. Its main function is to convert the mechanical energy of the prime mover into the static pressure energy and dynamic pressure energy of the working fluid. According to the blade form, it is divided into three types: open impeller, closed impeller, and semi-open impeller. The structures of the open impeller and the semi-open impeller are relatively simple. This simple structure makes the casting more convenient than that of the closed impeller. However, the requirement for the shape and position dimensions of the cast blade is a major difficulty: the impeller blade has a large twist, and one end of the blade is suspended relatively high, which is extremely easy to deform and cannot be reshaped, resulting in scrapping. The impeller structure is relatively complex, the filling difficulty is large, the exhaust is poor, and it is easy to generate air pockets and cause porosity defects.

[0004] In view of the above problems, we need to redesign the pouring investment casting structure for the impeller to improve the casting quality of the impeller. For this, we provide a new technical solution.

Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a pouring investment casting structure for an impeller, and the technical solution adopted is as follows:

[0006] A pouring investment casting structure for an impeller includes an impeller wax pattern, a pouring mold head wax pattern and a ring wax pattern; the impeller wax pattern includes a blade part and a hub part, and the bottom of the pouring mold head wax pattern is connected to the hub part on one side of the impeller; the ring wax pattern is located on the other side of the impeller wax pattern, and the side edge of the blade part of the ring wax pattern is connected.

[0007] According to an embodiment of the utility model, the pouring mold head includes a sprue cup wax pattern and a spherical mold head wax pattern.

[0008] According to an embodiment of the utility model, a plurality of wax removal strips are connected between the spherical mold head wax pattern and the blade part of the impeller wax pattern on the same side.

[0009] According to an embodiment of the utility model, the plurality of wax removal strips are connected around the spherical mold head wax pattern and are connected to the upper end part and the lower end part of the spherical mold head wax pattern respectively at the connection ends of the plurality of wax removal strips.

[0010] An investment casting structure for an impeller according to an embodiment of the present invention, a mating step is provided between the ring wax pattern and the blade part.

[0011] An investment casting structure for an impeller according to an embodiment of the present invention, the tip of the ring wax pattern is connected to the blade part.

[0012] An investment casting structure for an impeller according to an embodiment of the present invention, the pouring die head wax pattern and the hub part are assembled together by a wax pattern welding process; the ring wax pattern and the blade part are assembled together by a wax pattern welding process.

[0013] An investment casting structure for an impeller according to an embodiment of the present invention, the end of the wax draining strip is assembled with the ball die head wax pattern and the blade part by a wax pattern welding process.

[0014] An investment casting structure for an impeller according to an embodiment of the present invention, the impeller is an open impeller.

[0015] An investment casting structure for an impeller according to an embodiment of the present invention, the impeller is a semi-open impeller, and the hub part includes a shaft, a lower cover, and a reinforcing rib.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the present invention, the blade part of the impeller wax pattern and the ring are formed as a whole, so that after the shell mold is formed during shell making, it is also formed as a whole with the shell mold of the impeller. After pouring, the ring steel body and the impeller steel body are also integrated, which can effectively prevent the blade deformation or geometric tolerance deviation caused by the temperature difference stress during pouring cooling and heat treatment, and the casting quality of the impeller is significantly improved.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0019] Figure 1 is a three-dimensional schematic of the impeller Figure 1 ;

[0020] Figure 2 is a three-dimensional schematic of the impeller Figure 2 ;

[0021] Figure 3 is a structural schematic of an embodiment of the present invention Figure 1 ;

[0022] Figure 4 is a structural schematic of an embodiment of the present invention Figure 2 ;

[0023] Figure 5 Structural schematic diagram of an embodiment of the present utility model Figure 3 ;

[0024] Figure 6 Structural schematic diagram of an embodiment of the present utility model Figure 4 ;

[0025] Figure 7 Exploded schematic diagram of an embodiment of the present utility model Figure 1 ;

[0026] Figure 8 Exploded schematic diagram of an embodiment of the present utility model Figure 2 .

[0027] Description of main component symbols:

[0028] 10, impeller wax pattern; 11, blade part; 12, hub part; 20, sprue cup wax pattern; 30, ball mold head wax pattern; 40, ring wax pattern; 50, wax draining strip; 60, mating step.

Specific implementation manners

[0029] The embodiments of the present utility model will be described in detail below. The illustrated embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0030] The orientation shown in the drawings should not be construed as limiting the specific protection scope of the present utility model. It is only for reference and understanding of the preferred embodiments. The positions of the product components shown in the drawings can be changed, the quantity can be increased, or the structure can be simplified.

[0031] The "connection" described in the specification and the "connection" relationship between the components shown in the drawings can be understood as fixedly connected, detachably connected, or integrally formed connection; it can be directly connected or connected through an intermediate medium. Those of ordinary skill in the art can understand the connection relationship according to the specific situation and can obtain different implementation manners by means of screwing, riveting, welding, clamping, or embedding in a suitable manner for substitution.

[0032] The orientation words such as up, down, left, right, top, and bottom described in the specification and the orientation shown in the drawings. The components can be in direct contact or in contact through other features between them; for example, being above can be directly above or obliquely above, or it only means higher than other objects; other orientations can be analogously understood.

[0033] The manufacturing materials of the components with solid shapes shown in the specification and drawings can be metal materials, non-metal materials, or other composite materials; the machining processes applicable to the components with solid shapes can be stamping, forging, wire cutting, laser cutting, casting, injection molding, numerical milling, 3D printing, machining, etc.; those of ordinary skill in the art can adaptively select or combine the selection according to different processing conditions, costs, and precisions, but are not limited to the above materials and manufacturing processes.

[0034] The present utility model provides an impeller casting investment structure, as Figures 3 to 8 shown, including an impeller wax pattern 10, a casting mold head wax pattern, and a ring wax pattern 40; the impeller wax pattern 10 includes a blade part 11 and a hub part 12, and the bottom of the casting mold head wax pattern is connected to the hub part 12 on one side of the impeller 10; the ring wax pattern 40 is located on the other side of the impeller wax pattern 10 and is connected to the side edge of the blade part 11 of the ring 40.

[0035] In the embodiment, the investment material is casting wax, and all components are wax patterns. During casting, the impeller wax pattern 10, the casting mold head wax pattern, and the ring wax pattern 40 are manufactured separately first, and then the casting mold head wax pattern and the hub part 12 of the impeller wax pattern 10 are assembled together through the wax pattern group welding process, and the ring wax pattern 40 and the blade part 11 of the impeller wax pattern 10 are assembled together, thus forming a wax pattern group tree. Then, shell making and dewaxing are carried out to form a shell mold for casting. Then, the shell mold is baked and poured to form a casting steel tree. The casting steel tree includes a casting mold head steel body, a ring steel body, and an impeller steel body. Finally, the casting mold head steel body and the ring steel body are cut, and the impeller steel body is polished to finally obtain a cast impeller. The impeller is an open impeller or a semi-open impeller. When it is a semi-open impeller, the hub part 12 includes a shaft, a lower cover, and reinforcing ribs.

[0036] In the present utility model, the blade part 11 of the impeller wax pattern 10 and the ring wax pattern 40 are integrated. In this way, after shell making to form a shell mold, they are also integrated with the shell mold of the impeller. After pouring, the ring steel body and the impeller steel body are also integrated, which can effectively prevent the blade deformation or geometric tolerance deviation caused by the temperature difference stress during pouring cooling and heat treatment, and the casting quality of the impeller is significantly improved.

[0037] Furthermore, in some embodiments of the present utility model application, as Figure 3 、 4 、5, 7, 8 shown, the casting mold head wax pattern includes a pouring cup wax pattern 20 and a spherical mold head wax pattern 30. The pouring cup wax pattern 20 and the spherical mold head wax pattern 30 are integrally formed, and the spherical mold head wax pattern 30 enhances the feeding capacity during casting.

[0038] Furthermore, in some embodiments of the present utility model application, as Figures 1 to 5As shown, a plurality of wax draining bars 50 are connected between the spherical die head wax pattern 30 and the blade portion 11 of the impeller wax pattern 10 on the same side thereof. The end portions of the wax draining bars 50 are assembled together with the spherical die head wax pattern 30 and the blade portion 11 through a wax pattern group welding process. The arrangement of the wax draining bars 50 enhances the wax draining and exhaust capacity of the casting shell mold. The wax in the impeller shell mold can also be discharged into the spherical die head through the wax draining bars 50, preventing the situation of shell mold rupture caused by untimely wax draining. At the same time, it enhances the exhaust capacity during pouring, improves the filling speed during pouring, can prevent pouring defects at the thin-walled positions of the blades, and can also pour and form an auxiliary fork mold, further improving the impeller casting quality.

[0039] Further, in some embodiments of the present utility model application, such as Figure 3 、 4 As shown, the ferrule wax pattern 40 is connected to the tip of the blade portion 11. A wax draining bar 50 is provided at the tip position of each blade of the impeller, preventing the formation of porosity defects caused by air entrapment due to poor exhaust at the tip portion of the blade during the rapid filling process, and further improving the impeller casting quality.

[0040] Further, in some embodiments of the present utility model application, such as Figure 3 、 4 As shown in 5, 7, and 8, the plurality of wax draining bars 50 are connected around the spherical die head wax pattern 30 and connected to the spherical die head wax pattern 30, and the connecting end portions of the plurality of wax draining bars 50 are respectively connected to the upper end portion and the lower end portion of the spherical die head wax pattern 30. In this way, during wax draining or exhaust, the plurality of wax draining bars 50 can pass through different positions of the spherical die head wax pattern, ensuring timely and unobstructed wax draining and exhaust.

[0041] Further, in some embodiments of the present utility model application, such as Figure 3 、 4 As shown in 5, 7, and 8, a mating step 60 is provided between the ferrule wax pattern 40 and the blade portion 11. Specifically, a mating step 60 is provided at the tip position of the blade to connect with the ferrule wax pattern 40. The setting of the mating step 60 facilitates the wax pattern group welding on the one hand, making it convenient to connect the ferrule wax pattern 40 and the blade portion 11. On the other hand, after the steel tree is cast, when the impeller needs to be cut, the setting of the mating step 60 can prevent the blades from being cut and scrapped during the cutting process. In addition, it can effectively prevent the blade deformation or geometric tolerance deviation caused by the temperature difference stress during pouring cooling and heat treatment.

[0042] Although the present utility model has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art from this disclosure that various changes or modifications can be made to the present utility model without departing from the principles and spirit scope defined by the claims. Therefore, the detailed description of the embodiments of this disclosure is only for explanation and not for limiting the present utility model, but the scope of protection is defined by the content of the claims.

Claims

1. An investment casting structure for an impeller, characterized in that, It includes an impeller wax pattern (10), a pouring mold head wax pattern, and a ring wax pattern (40); the impeller wax pattern (10) includes a blade part (11) and a hub part (12), and the bottom of the pouring mold head wax pattern is connected to the hub part (12) on one side of the impeller wax pattern (10); the ring wax pattern (40) is located on the other side of the impeller wax pattern (10), and the side edges of the blade part (11) of the ring wax pattern (40) are connected.

2. The investment casting structure of an impeller according to claim 1, characterized in that, The pouring mold head wax pattern includes a sprue cup wax pattern (20) and a ball mold head wax pattern (30).

3. The investment casting structure of an impeller according to claim 2, characterized in that, A plurality of wax draining bars (50) are connected between the ball mold head wax pattern (30) and the blade part (11) of the impeller wax pattern (10) on the same side.

4. A casting investment mold structure for an impeller according to claim 3, characterized in that, The plurality of wax draining bars (50) surround the ball mold head wax pattern (30) and are connected to the ball mold head wax pattern (30), and the connecting end parts of the plurality of wax draining bars (50) are respectively connected to the upper end part and the lower end part of the ball mold head wax pattern (30).

5. The investment casting structure for impeller casting according to claim 1, characterized in that, A mating step (60) is provided between the ring wax pattern (40) and the blade part (11).

6. The investment casting structure of an impeller according to claim 1, characterized in that, The tip of the ring wax pattern (40) is connected to the blade part (11).

7. The investment casting structure for impeller casting according to claim 1, wherein, The pouring mold head wax pattern and the hub part (12) are assembled together by a wax pattern group welding process; the ring wax pattern (40) and the blade part (11) are assembled together by a wax pattern group welding process.

8. A kind of impeller casting investment structure according to claim 3, characterized in that, The end part of the wax draining bar (50) and the ball mold head wax pattern (30), the blade part (11) are assembled together by a wax pattern group welding process.

9. The investment casting structure for impeller casting according to claim 1, wherein, The impeller is an open impeller.

10. The investment casting structure for impeller casting according to claim 1, characterized in that, The impeller is a semi-open impeller, and the hub part (12) includes a shaft, a lower cover, and reinforcing ribs.

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