Lining ball motor base casting mold capable of preventing sand washing

Abstract

The utility model discloses a lining ball motor base casting mould capable of preventing sand washing, which relates to the technical field of casting moulds and comprises a mould plate, an upper mould cavity forming structure arranged on the top surface of the mould plate, a lower mould cavity forming structure arranged on the bottom surface of the mould plate, a straight pouring column arranged on the top surface of the mould plate, an upper cross gate arranged on the top surface of the mould plate and connected with the straight pouring column, and a lower cross gate arranged on the top surface of the mould plate. The first inner pouring gate is vertically arranged on the lower die cavity forming structure, the second inner pouring gate and the first inner pouring gate are symmetrically arranged, the lower cross pouring gate is arranged on the bottom surface of the template, one end of the lower cross pouring gate is connected with the first inner pouring gate, and the other end of the lower cross pouring gate is connected with the second inner pouring gate through a straight pouring column and an upper cross pouring gate in a spaced manner; the problem of low casting quality caused by sand washing in a traditional casting process can be solved, and the production quality and efficiency of the lining ball motor base are improved.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, specifically to a casting mold for a ball-liner motor base that prevents sand erosion. Background Technology

[0002] Vertical multistage pumps are high-efficiency and energy-saving liquid conveying equipment, widely used in various industrial fields. The ball-lined motor base is a key component of a vertical multistage pump, typically made of gray cast iron and formed by sand casting. In mold design, considering high aesthetic requirements and the difficulty in thoroughly grinding the parting line seams, the pouring position is usually designed vertically. The parting line is selected as the interface between two ribs and the flange. The mold plate uses a punch-and-cone design, with a shorter upper mold and a taller lower mold. The taller lower mold needs to be recessed above the parting line to make the upper and lower mold heights relatively close, meeting the minimum sand intake requirement. The gating system design employs a horizontal runner and an internal runner to improve the process yield.

[0003] However, in actual production, it was found that sand holes often appeared on the surface of the casting blanks, and the proportion of sand holes was relatively large in each batch. After analysis, it was found that this was due to the sand scouring phenomenon caused by the high mold height and large impact force after the molten iron was poured. Sand scouring is a common defect that can cause holes filled with molding sand to appear on the surface or inside of the casting, which seriously affects the quality of the casting, resulting in low pass rate and low production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a casting mold for ball-lined motor bases that prevents sand erosion, aiming to solve the problem of low casting quality caused by sand erosion in traditional casting processes, and improve the production quality and efficiency of ball-lined motor bases.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: A casting mold for a ball-liner motor base to prevent sand erosion, comprising a mold plate;

[0006] An upper mold cavity forming structure is provided on the top surface of the mold plate;

[0007] A lower mold cavity forming structure is provided on the bottom surface of the mold plate;

[0008] A cast-in-place column, wherein the cast-in-place column is disposed on the top surface of the profile;

[0009] The upper horizontal runner is located on the top surface of the mold plate and is connected to the vertical casting column.

[0010] The first inner sprue is vertically disposed on the lower mold cavity forming structure;

[0011] The second ingate is symmetrically arranged with the first ingate.

[0012] The lower horizontal runner is located on the bottom surface of the mold plate, and one end of the lower horizontal runner is connected to the first ingate, while the other end is connected to the second ingate via the straight pouring column and the upper horizontal runner.

[0013] In some embodiments, the mold plate includes a convex cover, the outer surface of which is provided with the upper mold cavity forming structure, the sprue column, and the upper horizontal runner, and the inner top surface of the convex cover is provided with the lower mold cavity forming structure, the first inner runner, the second inner runner, and the lower horizontal runner;

[0014] A border, which surrounds the convex cover.

[0015] In some embodiments, the template further includes a plurality of locking holes arranged in a matrix on the frame, and the locking holes penetrate the frame.

[0016] In some embodiments, the cross-section of the locking hole is convex.

[0017] In some embodiments, the template further includes two threaded holes, which are symmetrically disposed at both ends of the frame.

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

[0019] In some embodiments, two venting plates are also included, one end of which is connected to the upper mold cavity forming structure and the other end is connected to the top surface of the frame.

[0020] In some embodiments, the two exhaust vents are misaligned.

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

[0022] This invention adds an internal flow channel connected to the mold cavity to divert the molten iron, allowing it to enter the mold cavity smoothly from two dispersed locations. This reduces the scouring of the molding sand, prevents sand erosion during casting, reduces sand loss and scrap, improves quality and pass rate, and increases 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, 11. Convex cap, 12. Frame, 13. Locking hole, 14. Threaded hole, 15. Positioning hole; 2. Upper mold cavity forming structure; 3. Lower mold cavity forming structure; 4. Sprue column; 5. Upper runner; 6. First ingate; 7. Second ingate; 8. Lower runner; 9. Venting plate. 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 1-2A casting mold for a ball-liner motor base to prevent sand erosion includes a mold plate 1, an upper mold cavity forming structure 2, a lower mold cavity forming structure 3, a sprue 4, an upper runner 5, a first ingate 6, a second ingate 7, and a lower runner 8. The upper mold cavity forming structure 2 is located on the top surface of the mold plate 1 and can cooperate with molding sand to form an upper mold cavity. Its shape and size match the upper structure of the ball-liner motor base and is used to form the upper shape of the casting. The lower mold cavity forming structure 3 is located on the bottom surface of the mold plate 1 and can cooperate with molding sand to form a lower mold cavity. Its shape and size match the lower structure of the ball-liner motor base. Used to form the lower shape of the casting, the upper mold forming cavity and the lower mold forming cavity cooperate to form a complete casting cavity. The sprue column 4 is located on the top surface of the mold plate 1 and can cooperate with the molding sand to form a straight channel. The straight channel can be connected to the pouring cup of the automatic molding machine and is the channel through which molten iron begins to enter during pouring. The upper horizontal sprue 5 is located on the top surface of the mold plate 1 and is connected to the sprue column 4. It can cooperate with the molding sand to form an upper horizontal flow channel connected to the straight channel. It can initially distribute and guide the molten iron entering the upper horizontal flow channel. The cross-section of the upper horizontal sprue 5 can be trapezoidal, and the size can be set according to the requirements of molten iron flow rate and velocity. The first inner... The gating system 6 is vertically mounted on the lower mold cavity forming structure 3. The second ingate 7 is symmetrically arranged with the first ingate 6 and can cooperate with molding sand to form two internal flow channels in the lower mold cavity, introducing molten iron into the cavity from two directions. After solidification, it forms a casting blank. The lower horizontal gating system 8 is located on the bottom surface of the mold plate 1, with one end connected to the first ingate 6 and the other end connected to the second ingate 7 via a vertical gating column 4 and an upper horizontal gating system 5. This connection means that there is a gap between the other end of the lower horizontal gating system 8 and the second ingate 7, and the vertical gating column 4 and the upper horizontal gating system are located on the back of this gap. 5. Furthermore, the lengths of the straight pouring column 4 and the upper horizontal runner 5 are greater than the length of the gap. Thus, when the lower horizontal runner 8 and molding sand cooperate to form the lower horizontal flow channel, one end of the lower horizontal flow channel is connected to an inner flow channel, and the other end is connected to another inner flow channel through the upper horizontal flow channel and the straight flow channel. This ensures that both ends of the lower horizontal flow channel are connected to inner flow channels, allowing the molten iron entering through the straight flow channel to smoothly enter the mold cavity through the two inner flow channels, thereby achieving the diversion of molten iron, reducing the flow rate and impact force of the molten iron, reducing the scouring of the molding sand, reducing the probability of sand scouring, ensuring the quality of castings, and improving the pass rate and production efficiency.

[0028] In some embodiments, the cross-sections of the first ingate 6 and the second ingate 7 may be flat trapezoids. Flat trapezoids can better control the flow rate and direction of molten iron while ensuring the flow rate of molten iron, so that the molten iron can flow smoothly into the mold cavity and reduce the erosion of the molding sand.

[0029] In some embodiments, the mold plate 1 includes a convex cover 11 and a frame 12. The outer surface of the convex cover 11 is provided with an upper mold cavity forming structure 2, a straight sprue 4, and an upper horizontal sprue 5. The inner top surface of the convex cover 11 is provided with a lower mold cavity forming structure 3, a first inner sprue 6, a second inner sprue 7, and a lower horizontal sprue 8. The convex cover 11 can make the upper mold cavity and the lower mold cavity form a concave-convex structure, which facilitates the positioning of the upper and lower molds after molding and prevents misalignment. The frame 12 surrounds the convex cover 11 and can protect and support the convex cover 11.

[0030] In some embodiments, the mold plate 1 further includes a plurality of locking holes 13, which are arranged in a matrix on the frame 12 and penetrate through the frame 12. During mold installation and use, by inserting bolts into the locking holes and tightening them, the upper mold and the lower mold can be tightly fixed together, preventing the mold from expanding due to the pressure of molten iron during the pouring process and ensuring the stability of the casting process.

[0031] In some embodiments, the cross-section of the locking hole 13 may be convex, which allows for countersunk installation of the bolt and enhances the locking effect.

[0032] In some embodiments, the mold plate 1 further includes two threaded holes 14, which are symmetrically located at both ends of the frame 12, allowing lifting eye bolts to be screwed in during mold loading and unloading. The mold can be easily lifted by inserting the hook of the chain into the hole of the lifting eye bolt.

[0033] In some embodiments, the template 1 further includes four positioning holes 15, which are symmetrically arranged at both ends of the frame 12, with two positioning holes 15 located at the same end symmetrically arranged on both sides of the threaded hole 14. These holes can cooperate with positioning pins on the mold frame during mold assembly to achieve precise mold positioning.

[0034] In some embodiments, two venting plates 9 are also included. One end of each venting plate 9 is connected to the upper mold cavity forming structure 2, and the other end is connected to the top surface of the frame 12. The venting plate 9 may be rectangular and may be made of a thin metal sheet with a thickness of 0.5-1mm, such as stainless steel or copper. The two venting plates 9 may be staggered. During the pouring of molten iron, the venting plates 9 can expel air from the cavity to prevent porosity defects in the casting blank. This is prior art and will not be described in detail here.

[0035] The specific working principle is as follows:

[0036] At the mold placement location, use two eye bolts of the corresponding specifications to tighten into the two threaded holes 14 respectively. Insert the hook of the iron chain into the eye bolts and fix it. Use an overhead crane to lift the mold onto the mold frame in the automatic molding section. Align the two positioning holes 15 of the mold with the positioning pins on the mold frame to position the mold. Use six bolts of the corresponding specifications to tighten into the six locking holes 13 respectively to fix the mold and ensure that the mold will not shift or loosen during the 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 casting cavity is formed under the combined action of the upper mold cavity forming structure 2, the lower mold cavity forming structure 3, and the molding sand. Use a blowtorch to carefully clean the residual loose sand in the cavity to ensure cleanliness. Next, accurately place a coated sand core in the designated position in the lower mold cavity, and simultaneously place a filter screen in the corresponding position on the direct current channel. Finally, place the upper molding sand stably on top of the lower molding sand to complete the mold closing operation.

[0038] During pouring, molten iron flows through the pouring cup into the straight runner, upper runner, and lower runner, and then flows into the mold cavity from two directions through two symmetrically arranged inner runners. After solidification, it forms a casting blank. During the flow of molten iron into the mold cavity, the double runner and double inner runner design allows the molten iron to enter the cavity smoothly from two dispersed locations, reducing the erosion of the molding sand, thus lowering the probability of sand erosion, avoiding sand loss defects, and improving the quality of the casting.

[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 casting mold for a ball-liner motor base to prevent sand erosion, characterized in that: Including the template (1); Upper mold cavity forming structure (2), the upper mold cavity forming structure (2) is provided on the top surface of the mold plate (1); The lower mold cavity forming structure (3) is located on the bottom surface of the mold plate (1); A cast-in column (4) is provided on the top surface of the mold plate (1); Upper horizontal gating (5), the upper horizontal gating (5) is provided on the top surface of the mold plate (1) and is connected to the vertical gating column (4); The first inner sprue (6) is vertically disposed on the lower mold cavity forming structure (3); The second ingate (7) is symmetrically arranged with the first ingate (6); The lower horizontal gating (8) is located on the bottom surface of the mold plate (1), and one end of the lower horizontal gating (8) is connected to the first inner gating (6), while the other end is connected to the second inner gating (7) through the straight gating column (4) and the upper horizontal gating (5).

2. The casting mold for a ball-type motor base to prevent sand erosion according to claim 1, characterized in that: The mold plate (1) includes a convex cover (11), the outer surface of the convex cover (11) is provided with the upper mold cavity forming structure (2), the straight sprue (4), and the upper horizontal sprue (5), and the inner top surface of the convex cover (11) is provided with the lower mold cavity forming structure (3), the first inner sprue (6), the second inner sprue (7) and the lower horizontal sprue (8). The frame (12) surrounds the convex cover (11).

3. The casting mold for a ball-type motor base to prevent sand erosion according to claim 2, characterized in that: The template (1) also includes a plurality of locking holes (13), which are arranged in a matrix on the frame (12) and the locking holes (13) penetrate the frame (12).

4. The casting mold for a ball-type motor base to prevent sand erosion according to claim 3, characterized in that: The cross-section of the locking hole (13) is convex.

5. A casting mold for a ball-type motor base to prevent sand erosion according to claim 2, characterized in that: The template (1) also includes two threaded holes (14), which are symmetrically located at both ends of the frame (12).

6. A casting mold for a ball-type motor base to prevent sand erosion according to claim 5, characterized in that: The template (1) also includes four positioning holes (15), which are symmetrically arranged at both ends of the frame (12), and two of the positioning holes (15) located at the same end are symmetrically arranged on both sides of the threaded hole (14).

7. A casting mold for a ball-type motor base to prevent sand erosion according to claim 2, characterized in that: It also includes two venting plates (9), one end of which is connected to the upper mold cavity forming structure (2), and the other end is connected to the top surface of the frame (12).

8. A casting mold for a ball-type motor base to prevent sand erosion according to claim 7, characterized in that: The two exhaust fins (9) are misaligned.

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