Core support-saving sand casting mold for sewage pump base
Through the design of providing square mud core heads at both ends of the upper and lower molds of the sewage pump base sand casting mold, the problems of uneven wall thickness and air tightness of the castings caused by the core supports in the existing technology are solved, and the castings are realized Uniform wall thickness and improved air tightness.
Patent Information
- Application Number
- CN202421033214.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-13
AI Technical Summary
In the prior art, by placing a core brace on the mud core, the carbon steel and cast iron are not completely fused, and the height of the core brace cannot be completely consistent with the actual wall thickness, resulting in obvious joints at the contact point, affecting the airtightness and leading to processing. The base is scrapped.
Design a core-support-saving sewage pump base sand casting mold. By providing square mud core heads at both ends of the upper and lower molds, there is no need to set up additional core supports. The design of the square mud core heads avoids the need for mud cores. rotation and deflection to ensure uniform wall thickness.
This ensures uniform casting wall thickness without the need for core supports, avoids casting thinning and air tightness problems, and improves the stability of product quality.
Smart Images
Figure CN222370299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting, in particular to a core-saving sand casting mould for a sewage pump base. Background Art
[0002] Casting mold refers to the mold used to form castings in the casting process, which is divided into outer mold and mud core mold. Large submersible sewage pumps are generally equipped with automatic coupling devices for automatic installation, so installation and maintenance are quite convenient. The base is a main part of the automatic coupling device, which is in the shape of a 90-degree elbow, completely through the middle, and is circular. Water enters at one end and exits at the other end. It is generally made of cast iron and is formed by sand casting.
[0003] When designing the base casting mold, since the cavity at the water inlet and outlet ends is a through circular shape, the mud core head of the mold is also designed to be circular. With this design, the mold is very convenient to make and process, and the sand core is also simple to make. However, during the pouring process after the mud core is molded, the buoyancy generated by the injection of molten iron into the cavity is relatively large. Although the upper and lower molds respectively press the circular mud core heads, under the action of buoyancy, the contact surfaces of the circular mud core heads are circular surfaces, and the two mud core heads will rotate at the same time, causing other parts of the mud core far away from the mud core heads to deviate from their correct position and warp upwards due to lack of support, causing the cavity here to become thinner, less molten iron to flow in, and the wall thickness of the casting blank to be thin, and even cold shut and insufficient pouring may occur and lead to scrap. In addition, the thin wall thickness also results in poor strength of the blank, which cannot meet the strength requirements for use.
[0004] In order to solve the above problems, currently, a core support is generally placed on the mud core. By placing several core supports with a height basically the same as the wall thickness on the mud core before closing the box, when pouring molten iron, due to the supporting effect of several core supports, the mud core does not rotate or deviate from its correct position, so the wall thickness does not become thinner. However, since the core support is made of ordinary carbon steel and the surface is tinned, although the wall thickness is guaranteed when the mud core is fixed, the melting point of carbon steel is higher than that of the poured molten iron, resulting in incomplete fusion of carbon steel and cast iron. In addition, the height of the core support cannot be exactly the same as the actual wall thickness between the mud core and the casting mold after the mud core is placed in the actual model, resulting in obvious seams at the contact point. When the base is tested for air tightness, leakage occurs, resulting in the scrapping of the processed base. In view of this, this application is specially proposed. Utility Model Content
[0005] The present application proposes a core-saving sand casting mold for a sewage pump base to solve the technical problem that in the prior art, several core supports with a height substantially the same as the wall thickness are placed on the mud core before the box is closed, but the melting point of carbon steel is higher than the poured molten iron, resulting in incomplete fusion of carbon steel and cast iron, and the height of the core support cannot be completely the same as the actual wall thickness between the mud core and the casting mold after the actual modeling, resulting in obvious seams at the contact point, and leakage occurs when the base is tested for air tightness, resulting in the technical problem that the processed base is scrapped. The above technical purpose of the utility model is achieved through the following technical solutions:
[0006] A core-saving sand casting mold for a sewage pump base, comprising a mold plate, an upper pattern, a sprue, an upper horizontal runner, an upper ingrate, a lower pattern, a lower horizontal runner, a lower ingrate, a locking mechanism and a positioning mechanism;
[0007] The mold plate includes a mold plate top and a mold plate bottom, the upper pattern is arranged in the middle position of the mold plate top, the upper pattern is in a 90-degree elbow state, and the end positions of the elbows at both ends of the upper pattern are provided with square mud core heads, the straight runner, the upper cross runner and the upper ingrown runner are arranged on the mold plate, the upper cross runner and the upper ingrown runner are respectively located on both sides of the straight runner, the lower pattern, the lower cross runner and the lower ingrown runner are all arranged on the bottom of the mold plate, the upper pattern and the lower pattern cooperate, the locking mechanism is arranged on the mold plate, and the positioning mechanism is arranged on the bottom of the mold plate.
[0008] Preferably, the locking mechanism includes locking holes and locking bolts, the locking holes are respectively arranged at peripheral positions on the upper and lower parts of the template, the locking holes on the upper and lower parts of the template are aligned, and the locking bolts are tightened in the aligned locking holes.
[0009] Preferably, the positioning mechanism comprises positioning holes, and the positioning holes are symmetrically arranged at two side positions below the template.
[0010] Preferably, threaded holes are respectively provided in the middle of both sides of the template.
[0011] Preferably, the sprue is communicated with the lower runner.
[0012] Preferably, the upper runner is communicated with the lower runner and the lower ingrate.
[0013] Preferably, the upper runner is connected to the lower runner and the upper mold respectively.
[0014] Preferably, the lower ingrate is respectively connected to the lower mold and the lower runner.
[0015] Compared with the prior art, the beneficial effects of the utility model include: by providing square mud core heads at the two end positions of the upper mold and the lower mold, there is no need to additionally set up core supports, which can reduce the cost of using core supports, and eliminate the rotation of the mud core after molten iron pouring, so the part away from the mud core head will not warp upward, the wall thickness of the blank is uniform, there is no leakage during the air tightness test, and the product quality is stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the template of the utility model;
[0017] Figure 2 It is a structural schematic diagram of the utility model below the template.
[0018] In the figure: 1. mold plate; 2. upper pattern; 3. straight runner; 4. upper horizontal runner; 5. upper ingrate; 6. locking hole; 7. threaded hole; 8. lower pattern; 9. lower horizontal runner; 10. lower ingrate; 11. positioning hole. DETAILED DESCRIPTION
[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.
[0022] Please refer to the attached Figure 1-2A core-saving sand casting mold for a sewage pump base includes a mold plate 1, an upper mold 2, a sprue 3, an upper horizontal runner 4, an upper ingrate 5, a lower mold 8, a lower horizontal runner 9, a lower ingrate 10, a locking mechanism and a positioning mechanism;
[0023] The mold plate 1 includes a mold plate 1 top and a mold plate 1 bottom, an upper pattern 2 is arranged in the middle position of the mold plate 1, the upper pattern 2 is in a 90-degree elbow state, and the end positions of the elbows at both ends of the upper pattern 2 are provided with square mud core heads, a straight runner 3, an upper cross runner 4 and an upper ingrown runner 5 are arranged on the mold plate 1, the upper cross runner 4 and the upper ingrown runner 5 are respectively located on both sides of the straight runner 3, a lower pattern 8, a lower cross runner 9 and a lower ingrown runner 10 are all arranged on the bottom of the mold plate 1, the straight runner 3 is connected with the lower cross runner 9, the upper cross runner 4 is connected with the lower cross runner 9 and the lower ingrown runner 10, the upper ingrown runner 5 is connected with the lower cross runner 9 and the upper pattern 2 respectively, the lower ingrown runner 10 is respectively connected with the lower pattern 8 and the lower cross runner 9, the upper pattern 2 cooperates with the lower pattern 8, a locking mechanism is arranged on the mold plate 1, and a positioning mechanism is arranged on the bottom of the mold plate 1.
[0024] With the above technical solution, the mold plate 1 is the main skeleton part of the mold, which is divided into the upper mold plate and the lower mold plate. The upper mold plate and the lower mold plate adopt a concave-convex structure design, which is convenient for the accurate positioning of the upper box sand and the lower box sand after molding, and can prevent the upper casting and the lower casting from being misaligned after the mold is withdrawn; the upper mold 2 is the upper mold part that forms the blank, which is in a 90-degree elbow state, and at the end of the two elbows, there is a square mud core head; the straight runner 3 is connected to the pouring cup of the automatic molding machine, which is the channel for molten iron to enter during pouring, and is connected to the lower cross runner 9; the upper cross runner 4 is respectively connected to the lower cross runner 9 and the lower endocastor 10, and the molten iron from the lower cross runner is poured into the molten iron core. The molten iron of the runner 9 flows into the lower mold 8 through the lower ingrown 10; the upper ingrown 5 is connected to the lower cross runner 9 and the upper mold respectively, and the molten iron from the lower cross runner 9 is introduced into the upper mold 2; the lower mold 8 is the upper mold part that forms the blank, and it is also in a 90-degree elbow state. At the end of the two elbows, there is also a square sand core head; the lower cross runner 9 is connected to the straight runner 3, the upper cross runner 4 and the upper ingrown 5 respectively, and the molten iron from the straight runner 3 is introduced into the upper cross runner 4 and the upper ingrown 5 respectively; the lower ingrown 10 is connected to the lower mold 8 and the lower cross runner 9 respectively, and the molten iron from the lower cross runner 9 is introduced into the lower mold 8.
[0025] In some embodiments, the locking mechanism includes locking holes 6 and locking bolts. The locking holes 6 are respectively arranged at peripheral positions above and below the template 1. The locking holes 6 above and below the template 1 are aligned, and the locking bolts are tightened in the aligned locking holes 6.
[0026] With the above technical solution, after the mold is positioned, six locking bolts are placed in the aligned locking holes 6 in sequence to lock the mold.
[0027] In some embodiments, the positioning mechanism includes positioning holes 11 , and the positioning holes 11 are symmetrically arranged at two sides below the template 1 .
[0028] By adopting the above technical solution, when installing the mold, the positioning hole 11 is aligned and connected with the positioning pin on the mold frame, and the mold is positioned on the positioning pin on the mold frame.
[0029] In some embodiments, threaded holes 7 are respectively provided in the middle of two sides of the template 1 .
[0030] By adopting the above technical solution, when loading and unloading the mold, two eye bolts are screwed into the threaded hole 7 to facilitate the insertion of the hook of the iron chain to lift the mold.
[0031] Working steps:
[0032] Step 1: At the mold placement location, use two eyebolts of corresponding specifications to tighten them into the two threaded holes 7 respectively, insert the hook of the iron chain and fix it, and use the crane to lift the mold to the mold rack at the automatic line molding location;
[0033] Step 2: Align the two positioning holes 11 of the mold with the positioning pins on the mold frame to position the mold;
[0034] Step 3: Use six locking bolts of corresponding specifications to tighten them into the six locking holes 6 to fix the mold;
[0035] Step 4, start the automatic line molding machine to perform automatic molding;
[0036] Step 5. After molding a box, the mold automatically withdraws and the corresponding mud core is placed in the cavity of the lower casting mold. After placement, the two square mud core heads of the mud core overlap with the two square mud core head cavities in the cavity respectively, and the mud core is put in half the height in the height direction. Then, the molding machine is started with both hands, the upper casting mold falls, and is aligned with the lower casting mold. At this time, the two square mud core head cavities in the cavity of the upper casting mold press the two square mud core heads of the mud core respectively, and the box is closed;
[0037] Step 6: After the molding of this box is completed, the entire mold begins to fall and is placed on the sliding table;
[0038] Step 7, shape the next box, put the clay core, close the box, and place it on the sliding table;
[0039] Step 8: Carry out preparation work before pouring. When the number of molds is enough for one bag, deliver a bag of molten iron, and pour it into the automatic pouring machine ladle after slag removal and temperature measurement;
[0040] Step 9, slowly pour the molten iron in the ladle into the pouring cup of the casting mold. At this time, one path of molten iron flows into the cavity where the lower pattern 8 is located through the pouring cup, the straight runner 3, the lower horizontal runner 9, the upper horizontal runner 4, and the lower ingrate 10, while the other path of molten iron flows into the cavity where the upper pattern 2 is located through the lower horizontal runner 9 and the upper ingrate 5, filling the cavity together, and forming a blank after cooling. Since the upper casting mold presses down the two square mud core planes respectively, the mud core in the cavity cannot rotate under the buoyancy of the molten iron, so the part away from the mud core head will not rise up, and the wall thickness of the blank is uniform and will not become thinner.
[0041] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.
Claims
1. A core-saving sand casting mold for a sewage pump base, characterized in that: It comprises a mold plate (1), an upper mold (2), a sprue (3), an upper runner (4), an upper ingrate (5), a lower mold (8), a lower runner (9), a lower ingrate (10), a locking mechanism and a positioning mechanism; The mold plate (1) comprises a mold plate (1) top and a mold plate (1) bottom, the upper pattern (2) is arranged in the middle position of the mold plate (1) top, the upper pattern (2) is in a 90-degree elbow state, and the ends of the elbows at both ends of the upper pattern (2) are provided with square mud core heads, the straight runner (3), the upper cross runner (4) and the upper ingrow (5) are arranged on the mold plate (1), the upper cross runner (4) and the upper ingrow (5) are respectively located on both sides of the straight runner (3), the lower pattern (8), the lower cross runner (9) and the lower ingrow (10) are all arranged on the bottom of the mold plate (1), the upper pattern (2) and the lower pattern (8) cooperate, the locking mechanism is arranged on the mold plate (1), and the positioning mechanism is arranged on the bottom of the mold plate (1).
2. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The locking mechanism comprises a locking hole (6) and a locking bolt, wherein the locking holes (6) are respectively arranged at peripheral positions on the upper surface of the template (1) and the lower surface of the template (1), the locking holes (6) on the upper surface of the template (1) and the lower surface of the template (1) are aligned, and the locking bolt is screwed into the aligned locking holes (6).
3. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The positioning mechanism comprises positioning holes (11), and the positioning holes (11) are symmetrically arranged at two side positions below the template (1).
4. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: Threaded holes (7) are respectively provided in the middle of two sides of the top of the template (1).
5. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The sprue (3) is connected to the lower runner (9).
6. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The upper runner (4) is connected to the lower runner (9) and the lower ingrate (10).
7. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The upper ingrate (5), the lower runner (9) and the upper mold (2) are respectively connected.
8. The core-saving sand casting mold for a sewage pump base according to claim 1 is characterized in that: The lower inner runner (10) is respectively connected to the lower mold (8) and the lower horizontal runner (9).