Water pump cover casting mold capable of preventing core breakage during molding

Abstract

The utility model discloses a water pump cover casting mold capable of preventing core breakage during molding, which relates to the technical field of casting molds and comprises a mold plate, two upper molds arranged on the top surface of the mold plate, two lower molds arranged on the bottom surface of the mold plate, a first straight pouring column arranged on the top surface of the mold plate, a second straight pouring column arranged on the bottom surface of the mold plate, and a third straight pouring column arranged on the bottom surface of the mold plate. The second straight pouring column is arranged on the bottom surface of the template and is coaxially arranged with the second straight pouring column, the lower cross gate is connected with the second straight pouring column, the ingate is vertically arranged on the lower mold, and the shunting piece is arranged on the top surface of the template and is connected with the ingate and the lower cross gate at intervals; according to the water pump cover casting mold capable of preventing core breakage during molding, smooth demolding of molding sand in a deep hole can be achieved, the situation that a water outlet through hole in the middle of a casting blank after molding and pouring is blocked and a casting is scrapped due to core breakage in the molding sand is avoided, and the percent of pass and the production efficiency of products are improved.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, specifically to a water pump cover casting mold that prevents core breakage during molding. Background Technology

[0002] Oil-filled submersible pumps are electric irrigation and drainage devices that integrate a water pump and a three-phase asynchronous motor, and are widely used in agriculture, industry, and municipal fields. The pump cover is a crucial component of the pump, and its casting quality affects the pump's performance and lifespan. Pump covers are generally made of gray cast iron and formed using a sand casting process.

[0003] In traditional water pump cover casting mold design, the central water outlet hole of the pump cover is small and very deep, with a depth-to-width ratio close to 1. During automatic line molding, the molding sand inside the deep hole cannot be easily demolded, causing the molding sand to break off in the middle. This results in the central water outlet hole of the casting blank being blocked after molding and pouring, leading to casting scrap. To solve this problem, the draft angle of the deep hole was increased, and the mold surface in this area was polished. However, the problem of core breakage was not solved, and the scrap rate of castings due to core breakage remained high, resulting in a low casting qualification rate and low production efficiency for this product. Utility Model Content

[0004] The purpose of this utility model is to provide a water pump cover casting mold that prevents core breakage during molding. This water pump cover casting mold that prevents core breakage during molding can achieve smooth demolding of the molding sand in the deep hole, avoid core breakage in the middle of the molding sand, and prevent the water outlet hole in the middle of the casting blank from being blocked after molding and pouring, which would cause the casting to be scrapped, thereby improving the product qualification rate and production efficiency.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a water pump cover casting mold to prevent core breakage during molding, including a mold plate;

[0006] Two upper patterns are disposed on the top surface of the template;

[0007] Two lower patterns are provided on the bottom surface of the template, and two upper patterns correspond one-to-one with the two lower patterns and are coaxially arranged.

[0008] The first direct-cast column is located on the top surface of the mold plate;

[0009] The second direct casting column is located on the bottom surface of the mold plate and is coaxially arranged with the second direct casting column.

[0010] The lower horizontal runner is connected to the second vertical pouring column;

[0011] An ingate, which is vertically disposed on the lower mold;

[0012] The flow divider is located on the top surface of the mold plate and is connected to the inlet runner and the lower horizontal runner in a vacuum.

[0013] In some embodiments, the upper pattern is coaxially provided with a first core-forming hole at its center, and the lower pattern is coaxially provided with a second core-forming hole at its center, wherein the height-to-diameter ratio of the first core-forming hole and the second core-forming hole is less than 0.5.

[0014] In some embodiments, the flow divider includes three interconnected flow dividers, which are respectively connected to the two inner runners and the lower runner in a vacuum.

[0015] In some embodiments, both the first cast-in-place column and the second cast-in-place column are concentrically arranged with the mold plate.

[0016] In some embodiments, a plurality of locking holes are further included, which are arranged in a matrix on the template and penetrate through the template.

[0017] In some embodiments, the plate may further include two threaded holes, which are symmetrically disposed at both ends of the plate.

[0018] In some embodiments, four positioning holes are also included, which are symmetrically arranged at both ends of the template, and two positioning holes located at the same end are symmetrically arranged on both sides of the threaded hole.

[0019] In some embodiments, two positioning bosses are further included, the two positioning bosses being symmetrically disposed on the bottom surface of the template;

[0020] Two positioning grooves are symmetrically arranged on the top surface of the template. The two positioning grooves correspond one-to-one with the two positioning bosses, and the positioning bosses are inserted into the positioning grooves.

[0021] In summary, this utility model has the following beneficial effects:

[0022] This invention, by setting a first core-forming hole and a second core-forming hole, moves the parting surface from the bottom surface to half the depth of the middle through hole, dividing the depth of the water outlet through hole into upper and lower halves. This reduces the friction and adhesion between the molding sand and the mold wall, thereby reducing the resistance encountered by the molding sand during demolding. This allows for smooth demolding of the first core-forming hole, the second core-forming hole, and the inner molding sand, preventing the molding sand from breaking in the middle. This avoids the situation where the water outlet through hole in the middle of the casting blank is blocked after molding and casting, causing the casting to be scrapped, thus improving the product qualification rate and production efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0025] In the diagram: 1. Mold plate; 2. Upper pattern; 3. Lower pattern; 4. First sprue; 5. Second sprue; 6. Lower runner; 7. Ingate; 8. Runner; 10. Locking hole; 11. Threaded hole; 12. Positioning hole; 13. Positioning boss; 14. Positioning groove; 15. First core forming hole; 16. Second core forming hole. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] refer to Figure 1-2 A water pump cover casting mold designed to prevent core breakage during molding includes a mold plate 1, two upper molds 2, two lower molds 3, a first sprue 4, a second sprue 5, a lower runner 6, an ingate 7, and a runner 8. The mold plate 1 forms the main skeleton of the mold, providing installation and support for other components. It can be made of high-strength steel, possessing excellent wear resistance and deformation resistance. The two upper molds 2 are located on the top surface of the mold plate 1, their shape and size precisely designed according to the upper structure of the water pump cover. They work in conjunction with molding sand to construct the upper mold forming area, used to shape the upper form of the casting. The two lower molds 3 are located on the bottom surface of the mold plate 1, corresponding one-to-one with the upper molds 2 and coaxially distributed. This improves the symmetry and stability of the mold, helping to ensure the dimensional accuracy of the casting. Their shape and size fit the lower structure of the water pump cover, and they work with molding sand to form the lower mold forming area, used to create the lower shape of the casting. The upper and lower mold forming areas cooperate to construct a complete casting cavity.

[0028] The first straight sprue 4 is located on the top surface of the mold plate 1 and, together with the molding sand, forms the first straight channel. The first straight channel is connected to the sprue cup of the automatic molding machine. The second straight sprue 5 is located on the bottom surface of the mold plate 1 and is coaxially arranged with the molding sand to form the second straight channel. The first and second straight channels together form the initial channel for molten iron to enter the mold during pouring. The lower horizontal sprue 6 is connected to the second straight sprue 5 and, together with the molding sand, forms the lower horizontal runner. It can receive molten iron from the second straight sprue 5 and divert and guide the molten iron. The inner sprue 7 is vertically located on the lower mold plate 3 and, together with the molding sand, forms an inner runner in the lower mold forming cavity. The inner flow channel is responsible for precisely introducing molten iron into the cavity constructed by the upper mold 2 and the lower mold 3. After the molten iron solidifies here, it is formed into a water pump cover casting blank. The flow divider 8 is located on the top surface of the mold plate 1. The flow divider 8 may include three interconnected flow dividers. The three flow dividers are respectively connected to the two inner gating channels 7 and the lower horizontal gating channel 6 in a spaced manner. The spaced connection here means that the flow dividers cooperate with the molding sand to form three flow dividers. The flow dividers are connected to the lower horizontal gating channel and the two inner flow channels to form a flow channel for molten iron to flow from the starting channel to the cavity, optimizing the flow path of molten iron and enabling molten iron to be evenly distributed to the two inner gating channels 7, thereby ensuring that the forming quality of the two water pump cover castings is consistent.

[0029] In some embodiments, the upper pattern 2 has a first core-forming hole 15 coaxially arranged at its center, and the lower pattern 3 has a second core-forming hole 16 coaxially arranged at its center. The first core-forming hole 15 cooperates with the molding sand to form a first core column, and the second core-forming hole 16 cooperates with the molding sand to form a second core column. The first core column and the second core column abut coaxially to form a core column of molding sand, thereby realizing the formation of deep holes after casting. The height-to-diameter ratio of the first core-forming hole 15 and the second core-forming hole 16 is less than 0.5, which can reduce the friction and adhesion between the molding sand and the mold wall, reduce the resistance encountered by the molding sand during demolding, and thus realize the smooth demolding of the molding sand with the first core-forming hole 15 and the second core-forming hole 16, avoiding the breakage of the core in the middle of the molding sand, which would cause the water outlet hole in the middle of the casting blank to be blocked after molding and casting, resulting in the scrapping of the casting.

[0030] In some embodiments, the first direct casting column 4 and the second direct casting column 5 are both concentrically arranged with the mold plate 1, which can ensure that the flow path of molten iron is symmetrical and help the casting to be formed uniformly.

[0031] In some embodiments, a plurality of locking holes 10 are also included, which are arranged in a matrix on the mold plate 1 and penetrate through the mold plate 1. After the mold is closed, by screwing in the matching bolts into the locking holes 10 and tightening them, the upper mold and the lower mold can be tightly fixed, preventing the mold from separating due to the pressure of molten iron during the pouring process, and ensuring the stable progress of the casting process.

[0032] In some embodiments, the mold further includes two threaded holes 11, which are symmetrically located at both ends of the mold plate 1. During mold installation and disassembly, lifting eye bolts can be screwed into the threaded holes 11. By connecting the lifting eye bolts to the chain hooks, the mold can be easily lifted and transported.

[0033] In some embodiments, the mold further includes four positioning holes 12, which are symmetrically arranged at both ends of the mold plate 1, with two positioning holes 12 located at the same end symmetrically arranged on both sides of the threaded hole 11. During mold installation, the positioning holes 12 cooperate with the positioning pins on the mold frame to achieve precise installation and positioning of the mold, ensuring the accuracy of the mold installation position.

[0034] In some embodiments, the mold further includes two positioning bosses 13 and two positioning grooves 14. The two positioning bosses 13 are symmetrically arranged on the bottom surface of the mold plate 1, and the two positioning grooves 14 are symmetrically arranged on the top surface of the mold plate 1. The two positioning grooves 14 correspond one-to-one with the two positioning bosses 13, and the positioning bosses 13 and positioning grooves 14 are interlocked. This ensures accurate alignment of the upper mold forming area and the lower mold forming area during the mold closing process, prevents misalignment, and guarantees the dimensional accuracy of the casting.

[0035] The specific working principle is as follows:

[0036] During the mold lifting preparation stage, select two eye bolts of suitable specifications and screw them into the threaded holes 11 at both ends of the mold plate 1, ensuring they are tightened. Securely insert the chain hook into the holes of the eye bolts and fix it in place. Use an overhead crane to lift the mold to the mold frame above the automatic molding line. Slowly lower the mold, ensuring that the four positioning holes 12 on the mold plate 1 are accurately aligned with the positioning pins on the mold frame, completing the initial positioning of the mold. Subsequently, take several bolts of suitable specifications and screw them into the multiple locking holes 10 on the mold plate 1, tightening them one by one, thereby firmly fixing the mold to the mold frame, ensuring that the mold will not shift or loosen during the subsequent casting process.

[0037] After completing the above preparations, start the automatic molding line. The molding machine injects molding sand into the sand box and mold. After the sand injection is complete, the upper and lower sand boxes separate, and the mold exits the molding machine. At this point, the upper pattern 2, lower pattern 3, and molding sand work together to form the casting cavity. Use a blowtorch to carefully clean the cavity of any remaining loose sand to ensure cleanliness. Next, accurately place the two coated sand cores in their designated positions within the lower mold forming cavity, and simultaneously place filter screens in the corresponding positions of the first and second flow channels. Finally, place the upper molding sand stably on top of the lower molding sand to complete the mold closing operation.

[0038] During casting, molten iron is poured from the sprue cup of the automatic molding machine, flowing sequentially through the first straight channel formed by the first straight pouring column 4, the second straight channel formed by the second straight pouring column 5, and then into the lower horizontal runner formed by the lower horizontal runner 6. Within the lower horizontal runner, the molten iron is optimized and distributed by the flow divider 8, flowing into the inner runners formed by the two inner runners 7. The molten iron flows evenly from both directions into the cavity constructed by the upper mold 2 and the lower mold 3, and after cooling and solidification, it forms the water pump cover casting blank.

[0039] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A water pump cover casting mold to prevent core breakage during molding, characterized in that: Including the template (1); Two upper patterns (2) are provided on the top surface of the template (1); Two lower patterns (3) are provided on the bottom surface of the template (1), and two upper patterns (2) correspond one-to-one with the two lower patterns (3) and are coaxially arranged. The first straight-cast column (4) is located on the top surface of the mold plate (1); The second direct casting column (5) is located on the bottom surface of the mold plate (1) and is coaxial with the second direct casting column (5); The lower horizontal gating channel (6) is connected to the second vertical gating column (5); Inner gating (7), the inner gating (7) is vertically arranged on the lower pattern (3); The flow divider (8) is located on the top surface of the mold plate (1) and is connected to the inner gating (7) and the lower horizontal gating (6) in a vacuum.

2. The water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: The upper pattern (2) is coaxially provided with a first core-forming hole (15) at its center, and the lower pattern (3) is coaxially provided with a second core-forming hole (16) at its center. The ratio of the height to the diameter of the first core-forming hole (15) and the second core-forming hole (16) is less than 0.

5.

3. A water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: The flow divider (8) includes three interconnected flow dividers, which are respectively connected to the two inner runners (7) and the lower horizontal runner (6) in a vacuum.

4. A water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: The first cast column (4) and the second cast column (5) are both concentrically arranged with the mold plate (1).

5. A water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: It also includes a plurality of locking holes (10), which are arranged in a matrix on the template (1) and the locking holes (10) penetrate the template (1).

6. A water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: It also includes two threaded holes (11), which are symmetrically located at both ends of the template (1).

7. A water pump cover casting mold for preventing core breakage during molding according to claim 6, characterized in that: It also includes four positioning holes (12), which are symmetrically arranged at both ends of the template (1), and two of the positioning holes (12) located at the same end are symmetrically arranged on both sides of the threaded hole (11).

8. A water pump cover casting mold for preventing core breakage during molding according to claim 1, characterized in that: It also includes two positioning bosses (13), which are symmetrically arranged on the bottom surface of the template (1); Two positioning grooves (14) are symmetrically arranged on the top surface of the template (1). The two positioning grooves (14) correspond one-to-one with the two positioning bosses (13), and the positioning bosses (13) are inserted into the positioning grooves (14).

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