Die for preventing mud core from being mistakenly placed in casting production process of nodular cast iron pipeline
By setting an anti-misalignment ring structure in the ductile iron pipe casting mold, the problem of core misalignment was solved, positioning interference during the production process was eliminated, scrap parts were reduced, and costs were lowered.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-06
AI Technical Summary
In the casting process of ductile iron pipes, when the same set of molds is used to produce different socket pipe fittings, the core may be placed in the wrong mold, leading to product scrap.
Design a mold structure in which each set of socket components includes an outer mold and a quick-change core box, and is equipped with an anti-misalignment ring structure to ensure that the shape and/or size of the anti-misalignment rings of different sets of components do not match. By setting anti-misalignment rings on the outer and inner circumferences at the end of the core, misalignment of the core is prevented.
It effectively prevents incorrect core placement, reduces scrap parts, lowers production costs, and has a simple structure that is easy to modify on existing molds without affecting the original socket structure.
Smart Images
Figure CN223970814U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting mold technology for ductile iron pipes, specifically a mold for preventing the wrong core from being placed during the casting process of ductile iron pipes. Background Technology
[0002] In the casting production process of ductile iron pipes, for pipe fittings of the same specification but with different socket joints, in order to save on mold investment costs, a shared mold plus quick-change socket parts are usually used for casting production. For example Figure 2 and 3 The two pipe fittings shown are of the same specification and type, but differ in their connector sockets. Their casting production is achieved using a single mold (outer mold + core box), with interchangeable socket quick-change parts, such as... Figure 4 The image shows a mold used for molding, which can produce pipe fitting molds with two different socket types. Figure 5 The mold is used for core making and can produce two different types of cores with different sockets.
[0003] However, in the actual process of producing different socket pipe fittings using a shared set of molds and interchangeable outer mold socket quick-change parts and core box socket quick-change parts, the identical size of the two molds and two cores can lead to the core being placed in the wrong mold, resulting in the production of scrap pipe fittings. Therefore, there is an urgent need for a mold that prevents the wrong core from being placed during the casting process of ductile iron pipes to solve this problem. Utility Model Content
[0004] The purpose of this invention is to provide a mold that prevents the wrong core from being placed in the mold during the casting process of ductile iron pipes, so as to solve the problem of product scrap caused by the core being placed in the wrong mold during production.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold for preventing incorrect core placement during the casting production of ductile iron pipes, comprising at least two sets of socket assemblies sharing the same mold, each set corresponding to a type of socket. Each set of socket assemblies includes two quick-change outer mold sockets and two quick-change core box sockets corresponding to both ends of the core, as well as a middle outer mold and a middle core box corresponding to the pipe body. In the aforementioned socket assemblies, the two quick-change outer mold sockets and the two quick-change core box sockets are respectively provided with anti-misplacement ring structures at both ends of the core. The anti-misplacement rings of the quick-change outer mold sockets are located on the outer periphery of the core end, and the anti-misplacement rings of the quick-change core box sockets are located on the inner periphery of the core end. The shape and size of the anti-misplacement rings of the quick-change outer mold sockets and the anti-misplacement rings of the quick-change core box sockets in the same set of socket assemblies match, while the shape and / or size of the anti-misplacement rings of the quick-change outer mold sockets and the quick-change core box sockets in different sets of socket assemblies do not match.
[0006] Preferably, for any two sets of socket components A and B sharing the same mold, the diameter A of the anti-misalignment rings at the same position m of the corresponding core is greater than that of B, while at the same other position n of the corresponding core, the diameter A of the anti-misalignment rings is less than that of B.
[0007] Preferably, the outer peripheral surface of the quick-change anti-misalignment ring of the outer mold socket in at least one set of socket assemblies sharing the same mold intersects with any axial section of the core as a broken line or curve that is not parallel to the core centerline.
[0008] Compared with the prior art, the beneficial effects of this utility model are:
[0009] 1. This mold, which prevents the wrong core from being placed during the casting production of ductile iron pipes, can, when applied to the production of pipe fittings that share the same set of molds, prevent core positioning interference between different socket pipe fittings during the casting production process. This reduces or even avoids the occurrence of wrong core placement, reduces scrap parts, and indirectly helps to reduce production costs.
[0010] 2. The mold that prevents the wrong core from being placed during the casting process of ductile iron pipes has a simple and reasonable structure, is easy to modify and implement on the basis of existing molds, and since the modification location is at the core head, it will not affect the original socket structure. Attached Figure Description
[0011] Figure 1 This is a structural schematic diagram of one embodiment of the quick-change part for the outer mold socket of this utility model;
[0012] Figure 2 This refers to a type of pipe fitting manufactured using a shared set of molds, as mentioned in the background section.
[0013] Figure 3 This refers to another type of pipe fitting manufactured using a shared set of molds, as mentioned in the background section.
[0014] Figure 4 for Figure 2 and 3 Schematic diagram of the quick-change component for the outer mold socket in the mold shown;
[0015] Figure 5 for Figure 2 and 3 Schematic diagram of the quick-change component for the core box socket in the mold shown;
[0016] Figure 6 This is a structural schematic diagram of one embodiment of the quick-change core box socket of this utility model.
[0017] In the diagram: 1. Anti-misalignment ring for quick-change parts of outer mold socket; 2. Anti-misalignment ring for quick-change parts of core box socket. Detailed Implementation
[0018] See Figure 1 and 6 A mold for preventing incorrect core placement during the casting production of ductile iron pipes includes at least two sets of socket assemblies sharing the same mold. Each set corresponds to a type of socket. Each socket assembly includes two quick-change outer mold sockets and two quick-change core boxes corresponding to both ends of the core, as well as a middle outer mold and a middle core box corresponding to the pipe body. In the above-mentioned socket assemblies, the two quick-change outer mold sockets and the two quick-change core boxes are respectively provided with anti-misplacement ring structures at both ends of the core. The anti-misplacement ring 1 of the quick-change outer mold socket is located on the outer periphery of the core end, and the anti-misplacement ring 2 of the quick-change core box is located on the inner periphery of the core end. The shape and size of the anti-misplacement ring 1 of the quick-change outer mold socket and the anti-misplacement ring 2 of the quick-change core box are matched within the same set of socket assemblies. The shape and / or size of the anti-misplacement ring 1 of the quick-change outer mold socket and the anti-misplacement ring 2 of the quick-change core box are not matched within different sets of socket assemblies.
[0019] If the only limitation is different shapes or mismatched sizes, it may result in a mold core head made from a certain set of socket components being larger in size. Although the clay cores made from other sets of socket components are not compatible, they can still be installed. Therefore, it is still possible to insert the wrong clay core due to human error. Therefore, in order to prevent this situation, in a preferred embodiment, the anti-misalignment rings of any two sets of socket components A and B sharing the same mold have a diameter A greater than B at the same position m of the corresponding clay core, and at the same time, there is a diameter A less than B at another same position n of the corresponding clay core. This can ensure that the core head parts of any two sets of socket components are incompatible with each other, and it is impossible to insert the wrong clay core under any circumstances.
[0020] Further optional, for ease of implementation, one set of socket components sharing the same mold can remain unchanged, using the original cylindrical shape near the core head as the anti-misalignment ring, but the other sets must be modified to be different, that is, the outer peripheral surface of the anti-misalignment ring 1 of the quick-change part of the outer mold socket in at least one set of socket components sharing the same mold, and the intersection line with any axial section of the core, is a broken line or curve that is not parallel to the core centerline.
[0021] After adopting the above mold structure, interference in the core positioning between different socket pipe fittings can be formed during the casting production process. After our company adopted a set of shared molds plus quick-change socket parts to produce UNI TYT and UNI STD socket pipe fittings, the situation of incorrect core placement has never occurred again.
[0022] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.
[0023] Any aspects of this utility model not described in detail are known to those skilled in the art.
Claims
1. A mold for preventing the falling of a core in the production process of a ductile cast iron pipe, comprising at least two sets of socket assemblies sharing the same set of molds, each set corresponding to one type of socket, each set of socket assemblies comprising two outer mold socket quick change parts and two core box socket quick change parts corresponding to both ends of a core, and a middle outer mold and a middle core box corresponding to the body of the pipe, characterized in that: The two outer mold socket quick change parts and the two core box socket quick change parts are respectively provided with error prevention ring structures at both ends of the core, the error prevention ring of the outer mold socket quick change part is arranged on the outer periphery of the end of the core, the error prevention ring of the core box socket quick change part is arranged on the inner periphery of the end of the core, the error prevention ring of the outer mold socket quick change part of the same set of socket assemblies is matched with the error prevention ring of the core box socket quick change part in shape and size, and the error prevention ring of the outer mold socket quick change part of different sets of socket assemblies is not matched with the error prevention ring of the core box socket quick change part in shape and / or size.
2. A mold for preventing the dropping of a sand core in the production process of a ductile cast iron pipe according to claim 1, characterized in that: The diameters A of the error prevention rings of any two sets of socket assemblies A and B sharing the same set of molds are greater than B at one same position m of the core, and the diameters A of the error prevention rings of the two sets of socket assemblies are smaller than B at another same position n of the core.
3. A mold for preventing the dropping of a sand core in the production process of a ductile cast iron pipe according to claim 2, characterized in that: The intersection line between the outer periphery of the error prevention ring of the outer mold socket quick change part in at least one set of socket assemblies sharing the same set of molds and any axial section of the core is a broken line or a curve which is not parallel to the center line of the core.