Machining die for preventing out-of-round pipe fitting

Abstract

The utility model belongs to the technical field of sand mold casting, and relates to a machining mold for preventing pipe fitting out-of-round. The mold comprises a mold inner core (1) and a mold outer cavity (2), a cavity (3) is formed between the mold inner core (1) and the mold outer cavity (2), the vertical section of the mold inner core (1) is oval, the vertical section of the mold outer cavity (2) is oval, the outer diameter L1 of the mold inner core (1) in the vertical direction is larger than the outer diameter l1 of the mold outer cavity (2) in the horizontal direction, and the inner diameter L2 of the mold outer cavity (2) in the vertical direction is larger than the inner diameter l2 of the mold outer cavity (2) in the horizontal direction. The machining die for preventing the out-of-round pipe fitting is simple in structure, effectively solves the out-of-round problem of a bell and a spigot of the pipe fitting after the pipe fitting is formed, improves the quality of the pipe fitting, does not need manual roundness correction, reduces the labor intensity, ensures reliable insertion of the follow-up pipe fitting, avoids water leakage after insertion, and improves the use reliability.

Description

A machining mold for preventing pipe fittings from going out of round Technical Field

[0001] This utility model belongs to the field of sand casting technology, and more specifically, it relates to a processing mold for preventing pipe fittings from going out of round. Background Technology

[0002] On sand casting production lines, the out-of-roundness rate of ductile iron pipe fittings produced by existing technology is over 10%, requiring manual rounding, which wastes manpower and resources and reduces production efficiency.

[0003] Existing technology includes a device for preventing deformation of the socket of lost foam ductile iron pipe fittings, with publication number CN206286502U. This device describes a lost foam ductile iron pipe fitting with a circular cylindrical socket. The device comprises multiple equally spaced sand rings (1), which are joined to form a sand ring column. The outer surface of the sand ring column is tightly fitted to the inner surface of the socket (2) of the lost foam ductile iron pipe fitting, and adjacent equally spaced sand rings (1) are interlocked and fitted with a sealing ring. This invention overcomes the limitations of existing technologies where the sand rings cannot be properly fixed to the socket end face, and their dimensions are fixed, thus preventing deformation of the lost foam ductile iron pipe fitting socket. This technology does not address the technical problems or solutions described in this application. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a simple processing mold that effectively solves the problem of pipe fitting sockets being out of round after pipe fitting is formed, improves pipe fitting quality, eliminates the need for manual rounding, reduces labor intensity, ensures reliable subsequent pipe fitting insertion, prevents water leakage after insertion, and improves the reliability of use.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model is a processing mold for preventing pipe fittings from going out of round. It includes an inner mold core and an outer mold cavity. The space between the inner mold core and the outer mold cavity is a cavity. The vertical cross-section of the inner mold core is elliptical. The vertical outer diameter L1 of the inner mold core is greater than the horizontal outer diameter l1. The vertical inner diameter L2 of the outer mold cavity is greater than the horizontal inner diameter l2.

[0007] The pipe fittings processed by the aforementioned mold for preventing pipe fittings from going out of round include straight pipe fittings and vertical pipe fittings. The straight pipe fittings and vertical pipe fittings are an integral structure, and one end of the straight pipe fittings is a socket.

[0008] The mold core includes a straight inner tube section and a vertical inner tube section.

[0009] The outer cavity of the mold includes a straight tube section and a vertical tube section.

[0010] The vertical outer diameter L1 of the inner core straight tube section is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer cavity straight tube section is greater than the horizontal inner diameter l2.

[0011] The inner diameter L in the vertical direction of the outer cavity of the mold 2和 The difference between the vertical outer diameter L1 of the mold core and the vertical wall thickness of the pipe is equal to that of the pipe fitting.

[0012] The difference between the horizontal inner diameter l2 of the outer cavity of the mold and the horizontal outer diameter l1 of the inner core of the mold is equal to the horizontal wall thickness of the pipe.

[0013] The pipe fittings processed by the aforementioned mold for preventing pipe fittings from going out of round are cast iron pipe fittings.

[0014] The mold has a casting port at the top of its outer cavity.

[0015] The working principle and beneficial effects of this utility model are as follows:

[0016] The present invention describes a processing mold for preventing pipe fittings from becoming out of round. It comprises an inner mold core and an outer mold cavity, which fit together to form a mold cavity used for pouring molten iron to form cast iron pipe fittings. To avoid the problem of out-of-roundness after pipe fitting processing, instead of directly producing a perfectly circular pipe fitting with a vertical inner diameter equal to its horizontal inner diameter, the mold is partially modified. The vertical cross-section of both the inner and outer mold cavities is elliptical. The vertical outer diameter L1 of the inner mold core is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer mold cavity is greater than the horizontal inner diameter l2. This results in a pipe fitting with a vertical inner diameter greater than its horizontal inner diameter. After the pipe fitting is removed from the mold, it is left to cool naturally before it is fully cooled. During this process, due to the weight of the pipe fitting, the vertical inner diameter of the socket will decrease and the horizontal inner diameter will increase. This deformation will offset the original inner diameter difference of the pipe fitting, resulting in a perfectly circular socket with a vertical inner diameter equal to the horizontal inner diameter after cooling. This automatically solves the problem of out-of-roundness of the pipe fitting and improves its quality. Attached Figure Description

[0017] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0018] Figure 1 is a schematic diagram of the processing mold for preventing pipe fittings from going out of round according to the present invention;

[0019] Figure 2 is a schematic diagram of the processing mold for preventing pipe fittings from going out of round according to the present invention;

[0020] Figure 3 is a schematic diagram of the processing mold for preventing pipe fittings from going out of round according to the present invention;

[0021] The labels in the attached diagram are as follows: 1. Inner core of mold; 2. Outer cavity of mold; 3. Cavity; 4. Straight pipe of fitting; 5. Vertical pipe of fitting; 6. Straight pipe section of inner core; 7. Vertical pipe section of inner core; 8. Straight pipe section of outer cavity; 9. Vertical pipe section of outer cavity; 10. Fitting. Detailed Implementation

[0022] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0023] As shown in Figures 1-3, this utility model is a processing mold for preventing pipe fittings from becoming out of round. It includes an inner mold core 1, an outer mold cavity 2, and a cavity 3 between the inner mold core 1 and the outer mold cavity 2. The vertical cross-section of the inner mold core 1 is elliptical, and the vertical cross-section of the outer mold cavity 2 is elliptical. The vertical outer diameter L1 of the inner mold core 1 is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer mold cavity 2 is greater than the horizontal inner diameter l2. This structure addresses the shortcomings of existing technologies by proposing an improved technical solution. In this design, the inner mold core 1 and the outer mold cavity 2 are fabricated separately, and they fit together to form the cavity 3. The cavity 3 is used for pouring molten iron to form a cast iron pipe fitting 10. To avoid the out-of-roundness problem after the pipe fitting 10 is machined, instead of directly manufacturing a perfectly circular pipe fitting 10 with a vertical inner diameter equal to its horizontal inner diameter, local modifications are made to the inner core and outer cavity of the mold. The vertical cross-section of the inner core 1 and the outer cavity 2 of the mold are both elliptical. The vertical outer diameter L1 of the inner core 1 is larger than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer cavity 2 is larger than the horizontal inner diameter l2. This results in the machined pipe fitting 10 having a vertical inner diameter larger than its horizontal inner diameter. After the pipe fitting 10 is removed from the mold, it is allowed to cool naturally while still partially cooled. During this cooling process, due to the pipe fitting's own weight, the vertical inner diameter of the socket decreases while the horizontal inner diameter increases. This deformation compensates for the original inner diameter difference, resulting in a perfectly circular socket with a vertical inner diameter equal to its horizontal inner diameter after cooling. This automatically solves the out-of-roundness problem and improves the quality of the pipe fitting. The processing mold for preventing pipe fittings from becoming out of round as described in this utility model has a simple structure. After the pipe fitting is formed, it effectively solves the problem of out-of-roundness of the spigot and socket, improves the quality of the pipe fitting, eliminates the need for manual rounding, reduces labor intensity, ensures reliable insertion of subsequent pipe fittings, prevents water leakage after insertion, and improves the reliability of use.

[0024] The pipe fitting 10 processed by the mold for preventing pipe fitting from becoming out of round includes a straight pipe 4 and a vertical pipe 5, which are integral structures. One end of the straight pipe 4 is a socket. When the straight pipe 4 is processed in the mold, it has a vertical inner diameter that is larger than its horizontal inner diameter. After cooling, it becomes a pipe fitting 10 with an inner diameter that is basically circular.

[0025] The mold core 1 includes an inner core straight tube section 6 and an inner core vertical tube section 7. The mold outer cavity 2 includes an outer cavity straight tube section 8 and an outer cavity vertical tube section 9. The vertical outer diameter L1 of the inner core straight tube section 6 is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer cavity straight tube section 8 is greater than the horizontal inner diameter l2. The difference between the vertical inner diameter L2 of the mold outer cavity 2 and the vertical outer diameter L1 of the mold core 1 is equal to the vertical wall thickness of the pipe fitting 10. The difference between the horizontal inner diameter l2 of the mold outer cavity 2 and the horizontal outer diameter l1 of the mold core 1 is equal to the horizontal wall thickness of the pipe fitting 10. With the above structure, the mold core 1 and mold outer cavity 2 are partially improved. The inner core straight tube section 6 and the outer cavity straight tube section 8 cooperate to form the cavity 3, and after molten iron is poured in, the straight tube 4 of the pipe fitting 10 is formed.

[0026] The pipe fitting 10 processed by the mold for preventing pipe fitting from becoming out of round is a cast iron pipe fitting. A casting gate is provided at the upper part of the outer cavity 2 of the mold. The height of the casting gate is higher than the height of the inner core vertical pipe section 7 and the outer cavity vertical pipe section 9, and it is used to pour molten iron. The molten iron cools to form an integral pipe fitting 10.

[0027] The processing mold for preventing pipe fittings from becoming out of round according to this utility model is structurally designed with an inner core 1 and an outer cavity 2. The inner core 1 and the outer cavity 2 fit together to form a mold cavity 3, which is used to pour molten iron to form a cast iron pipe fitting 10. To avoid the problem of out-of-roundness after the pipe fitting 10 is processed, instead of directly producing a perfectly circular pipe fitting 10 with a vertical inner diameter equal to its horizontal inner diameter, the inner core 1 and the outer cavity 2 are locally modified. The vertical cross-section of the inner core 1 is elliptical, and the vertical cross-section of the outer cavity 2 is elliptical. The vertical outer diameter L1 of the inner core 1 is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer cavity 2 is greater than the horizontal inner diameter l2. In this way, the processed pipe fitting 10 has a vertical inner diameter greater than its horizontal inner diameter. After the pipe fitting 10 is removed from the mold, it is placed to cool naturally before it is fully cooled. During this process, due to the weight of the pipe fitting, the inner diameter of the socket in the vertical direction will decrease and the inner diameter in the horizontal direction will increase. This deformation will offset the original inner diameter difference of the pipe fitting 10, so that after cooling, the pipe fitting 10 forms a perfectly circular socket with the inner diameter in the vertical direction equal to the inner diameter in the horizontal direction. This automatically solves the problem of the pipe fitting being out of round and improves the quality of the pipe fitting.

[0028] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A machining mold for preventing pipe fittings from becoming out of round, characterized in that: The mold includes an inner core (1) and an outer cavity (2). A cavity (3) is formed between the inner core (1) and the outer cavity (2). The vertical cross-section of the inner core (1) is elliptical, and the vertical cross-section of the outer cavity (2) is elliptical. The outer diameter L1 of the inner core (1) in the vertical direction is greater than the outer diameter l1 in the horizontal direction, and the inner diameter L2 of the outer cavity (2) in the vertical direction is greater than the inner diameter l2 in the horizontal direction.

2. The machining mold for preventing pipe fittings from becoming out of round according to claim 1, characterized in that: The pipe fitting (10) processed by the processing mold for preventing pipe fitting from becoming out of round includes a straight pipe (4) and a vertical pipe (5). The straight pipe (4) and the vertical pipe (5) are an integral structure, and one end of the straight pipe (4) is a socket.

3. The machining mold for preventing pipe fittings from becoming out of round according to claim 1 or 2, characterized in that: The mold core (1) includes a straight inner tube section (6) and a vertical inner tube section (7).

4. The machining mold for preventing pipe fittings from becoming out of round according to claim 3, characterized in that: The outer cavity (2) of the mold includes a straight tube section (8) and a vertical tube section (9).

5. The machining mold for preventing pipe fittings from becoming out of round according to claim 4, characterized in that: The vertical outer diameter L1 of the inner core straight tube section (6) is greater than the horizontal outer diameter l1, and the vertical inner diameter L2 of the outer cavity straight tube section (8) is greater than the horizontal inner diameter l2.

6. The machining mold for preventing pipe fittings from becoming out of round according to claim 4, characterized in that: The vertical inner diameter L of the outer cavity (2) of the mold 2和 The difference between the vertical outer diameter L1 of the mold core (1) and the vertical wall thickness of the pipe (10) is equal to that of the pipe fitting (10).

7. The machining mold for preventing pipe fittings from becoming out of round according to claim 6, characterized in that: The difference between the horizontal inner diameter l2 of the outer cavity (2) of the mold and the horizontal outer diameter l1 of the inner core (1) of the mold is equal to the horizontal wall thickness of the pipe (10).

8. The machining mold for preventing pipe fittings from becoming out of round according to claim 2, characterized in that: The pipe fitting (10) processed by the machining mold for preventing pipe fittings from going out of round is a cast iron pipe fitting.

9. The machining mold for preventing pipe fittings from becoming out of round according to claim 1 or 2, characterized in that: The upper part of the outer cavity (2) of the mold is provided with a casting port.

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