A coated sand core sand shell mold

Abstract

The utility model belongs to the field of coated sand molds, and proposes a coated sand core sand shell mold, including a shell mold and a cover mold, the shell mold including a first mold and a second mold, the first mold and the second mold are connected to form a sand shell cavity and a sand shell sand shooting port for shooting sand into a sand shell, four cover core positioning core heads symmetrically distributed in pairs are arranged in the sand shell cavity, the cover mold includes a third mold and a fourth mold, the third mold and the fourth mold are connected to form a cover plate cavity and a cover plate sand shooting port for shooting sand into a cover plate, a cover core cavity is arranged on one side of the cover plate cavity, and a cover core sand shooting port is arranged in the sand shooting direction of the cover core cavity. The utility model uses a shell mold to produce a sand shell that meets the casting needs, and uses a cover mold to simultaneously produce a cover plate and a cover core that meet the casting needs, and the sand shell, the cover plate and the cover core can form a casting structure with tower characteristics after being combined, and the casting cavity is connected from top to bottom, which can effectively improve the casting efficiency and save costs, and the cover core process can effectively ensure the quality of the casting product.

Description

Technical Field

[0001] The utility model belongs to the field of coated sand moulds, in particular to a coated sand core cover sand shell mould. Background Art

[0002] Sand casting is a casting method that uses sand as the main molding material to prepare the mold. Due to the characteristics of sand casting, it is not limited by the shape, size, complexity and alloy type of parts, and has a short production cycle and low cost. Therefore, sand casting is still the most widely used casting method in casting production. Coated sand casting is a type of sand casting. The use of coated sand to produce coated sand castings is a casting method with low energy consumption, especially the recycling and use of waste sand. The coated sand casting process uses a mold to form the sand mold under high pressure. After the coated sand is baked under high temperature and high pressure in the mold, it is quickly formed, and there is a molten iron flow channel in the sand mold. The shape of the flow channel is also the shape of the casting. In the foundry workshop, the sand core is placed in a designated box, and high-temperature molten iron is poured in from the pouring port, which can slowly evaporate the glue on the surface of the sand core. After cooling, the sand core becomes loose sand, and the corresponding casting is obtained.

[0003] The traditional sand core casting process uses an integrated sand shell with a pouring port on the sand shell. The casting liquid is poured in from the pouring port. However, the cooling casting is prone to flash and burrs, and its quality needs to be improved. Moreover, most of the sand shells are independent structures and need to be cast one by one. The casting work intensity is high and the productivity is low. Practice has proved that after the traditional sand core casting is replaced by the cover core sand shell process, that is, the sand shell has a cover port in addition to the pouring port, and the cover core is used to combine with the cover port. Such a cover core sand shell process is conducive to reducing the generation of flash and burrs, ensuring product quality, and can achieve the purpose of saving costs and improving production efficiency. Therefore, it is also necessary to design a matching coated sand mold for the cover core and the sand shell, so as to provide the cast workpiece with a cover core and a sand shell that meet the production requirements. Utility Model Content

[0004] Aiming at the mold demand after the traditional sand core casting is changed to the core cover sand shell process, the utility model proposes a coated sand core cover sand shell mold with reasonable design and capable of producing the core cover and the sand shell at the same time.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the utility model provides a coated sand core sand shell mold, including a shell mold and a cover mold, the shell mold includes a first mold and a second mold that are butt-matched, the first mold and the second mold are butt-jointed to form a sand shell cavity and a sand shell sand shooting port for shooting sand into a sand shell, four cover core positioning core heads symmetrically distributed in pairs are arranged in the sand shell cavity, the cover core positioning core heads include a first convex shape and a second convex shape, the cross-section of the first convex shape is rectangular, and the longitudinal section of the second convex shape is semicircular, the cover mold includes a third mold and a fourth mold that are butt-jointed, the third mold and the fourth mold are butt-jointed to form a cover plate cavity and a cover plate sand shooting port for shooting sand into a cover plate, a cover core cavity is arranged on one side of the cover plate cavity, and a cover core sand shooting port is arranged in the sand shooting direction of the cover core cavity.

[0006] Preferably, the first mold, the second mold, the third mold and the fourth mold are respectively provided with a pair of diagonally distributed first positioning holes, a pair of diagonally distributed second positioning holes, a pair of diagonally distributed third positioning holes and a pair of diagonally distributed fourth positioning holes, the first positioning hole is opposite to the second positioning hole, and the third positioning hole is opposite to the fourth positioning hole.

[0007] Preferably, the centers of the first mold, the second mold, the third mold and the fourth mold are respectively provided with a first casting process structure, a second casting process structure, a third casting process structure and a fourth casting process structure, the first casting process structure is connected to the second casting process structure, and the third casting process structure is connected to the fourth casting process structure.

[0008] Preferably, the number of the cover core cavities is 4, the 4 cover core cavities are distributed in a 2X2 pattern and are arranged close to a corner of the cover mold.

[0009] Compared with the prior art, the advantages and positive effects of the utility model are:

[0010] 1. The utility model provides a coated sand core-covered sand shell mold. The shell mold can produce sand shells that meet the casting needs, and the cover mold can simultaneously produce cover plates and cover cores that meet the casting needs. The sand shell, cover plate and cover core can form a casting structure with tower-shaped characteristics after being combined, and the casting cavity is connected from top to bottom, which can effectively improve the casting efficiency and save costs. The cover core process can effectively ensure the quality of the casting products. The device has a reasonable design, a simple structure, and can produce cover cores and sand shells at the same time to meet the realization of the cover core sand shell process, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A schematic diagram of the expansion of a shell mold provided in an embodiment;

[0013] Figure 2 A schematic diagram of the expansion of the cover mold provided in the embodiment;

[0014] Figure 3 An axonometric view of a first mold provided in an embodiment;

[0015] Figure 4 An axonometric view of a second mold provided in an embodiment;

[0016] Figure 5 An axonometric view of a third mold provided in an embodiment;

[0017] Figure 6 An axonometric view of a fourth mold provided in an embodiment;

[0018] Figure 7 A combined working diagram of a sand shell, a cover plate and a cover core provided for an embodiment;

[0019] In the above figures, 1. shell mold; 11. first mold; 12. second mold; 13. sand shell cavity; 14. sand shell sand shooting port; 15. cover core positioning core head; 151. first convex shape; 152. second convex shape; 16. first positioning hole; 17. second positioning hole; 18. first casting process structure; 19. second casting process structure; 2. cover mold; 21. third mold; 22. fourth mold; 23. cover plate cavity; 24. cover plate sand shooting port; 25. cover core cavity; 26. cover core sand shooting port; 27. third positioning hole; 28. fourth positioning hole; 29. ​​third casting process structure; 210. fourth casting process structure; 3. sand shell; 4. cover plate; 5. cover core. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0022] Examples, such as Figures 1 to 7 As shown, the utility model provides a coated sand core sand shell mold, including a shell mold 1 and a cover mold 2, the shell mold 1 includes a first mold 11 and a second mold 12 that are butt-matched, the first mold 11 and the second mold 12 are butt-jointed to form a sand shell cavity 13 and a sand shell sand shooting port 14 for sand shooting into a sand shell 3, four cover core positioning core heads 15 symmetrically distributed in pairs are arranged in the sand shell cavity 13, the cover core positioning core heads 15 include a first convex shape 151 and a second convex shape 152, the cross-section of the first convex shape 151 is rectangular, and the longitudinal section of the second convex shape 152 is semicircular, the cover mold 2 includes a third mold 21 and a fourth mold 22 that are butt-jointed, the third mold 21 and the fourth mold 22 are butt-jointed to form a cover plate cavity 23 and a cover plate sand shooting port 24 for sand shooting into a cover plate 4, a cover core cavity 25 is arranged on one side of the cover plate cavity 23, and a cover core sand shooting port 26 is arranged in the sand shooting direction of the cover core cavity 25. Among them, the sand shooting machine shoots sand from the sand shell sand shooting port 14 into the sand shell cavity 13 to form a sand shell 3, and the produced sand shell 3 has a cover opening that can cooperate with the cover core, and the shape of the cover opening matches the shape of the cover core positioning core head 15; the sand shooting machine shoots sand from the cover plate sand shooting port 24 into the cover plate cavity 23 to form the cover plate 4, and shoots sand from the cover core sand shooting port 26 into the cover core cavity 25 to form the cover core 5.

[0023] The shell mold 1 provided by the utility model can produce a sand shell 3 that meets the casting requirements, and the cover mold 2 can simultaneously produce a cover plate 4 and a cover core 5 that meet the casting requirements, and the sand shell 3, the cover plate 4 and the cover core 5 can form a casting structure with tower characteristics after being combined, such as Figure 7 As shown, the casting cavity is connected from top to bottom, which can effectively improve casting efficiency and save costs, and the core cover process can effectively ensure the quality of the casting product. The device has a reasonable design and a simple structure, and can produce the core cover and the sand shell at the same time to meet the realization of the core cover sand shell process.

[0024] In order to improve the mold closing accuracy of the first mold 11 and the second mold 12, the third mold 21 and the fourth mold 22, the utility model provides a pair of diagonally distributed first positioning holes 16, a pair of diagonally distributed second positioning holes 17, a pair of diagonally distributed third positioning holes 27 and a pair of diagonally distributed fourth positioning holes 28 respectively on the first mold 11, the second mold 12, the third mold 21 and the fourth mold 22. Among them, the first positioning hole 16 is opposite to the second positioning hole 17, and the third positioning hole 27 is opposite to the fourth positioning hole 28. By adopting the diagonally distributed design, the paired molds have a fixed centering direction when closing the mold, so as to ensure the accuracy of the mold closing, and then ensure the molding quality of the sand shell 3 and the cover plate 4.

[0025] In order to realize a casting flow channel for casting from top to bottom after the sand shell and the cover plate are combined, the centers of the first mold 11, the second mold 12, the third mold 21 and the fourth mold 22 provided by the utility model are respectively provided with a first casting process structure 18, a second casting process structure 19, a third casting process structure 29 and a fourth casting process structure 210, the first casting process structure 18 is connected with the second casting process structure 19, and the third casting process structure 29 is connected with the fourth casting process structure 210. Thus, the sand shell and the cover plate produced at the end have the following characteristics after being combined: Figure 7 The casting cavity shown can cast multiple cavities at one time to produce multiple cast workpieces.

[0026] In order to improve the utilization rate of the cover mold 2, the utility model provides four cover core cavities 25, so that four cover cores 5 can be formed at one time; at the same time, the four cover core cavities 25 are distributed in 2X2 and are arranged close to a corner of the cover mold 2, which makes it easy to shorten the sand shooting distance of the cover core sand shooting port 26 and improve the efficiency of sand shooting molding.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A coated sand core sand shell mold, characterized in that: It includes a shell mold and a cover mold, the shell mold includes a first mold and a second mold that are butt-matched, the first mold and the second mold are butt-jointed to form a sand shell cavity and a sand shell sand shooting port for sand shooting into a sand shell, four cover core positioning core heads symmetrically distributed in pairs are arranged in the sand shell cavity, the cover core positioning core heads include a first convex shape and a second convex shape, the cross-section of the first convex shape is rectangular, and the longitudinal section of the second convex shape is semicircular, the cover mold includes a third mold and a fourth mold that are butt-jointed, the third mold and the fourth mold are butt-jointed to form a cover plate cavity and a cover plate sand shooting port for sand shooting into a cover plate, a cover core cavity is arranged on one side of the cover plate cavity, and a cover core sand shooting port is arranged in the sand shooting direction of the cover core cavity.

2. A coated sand core-covered sand shell mold according to claim 1, characterized in that: The first mold, the second mold, the third mold and the fourth mold are respectively provided with a pair of diagonally distributed first positioning holes, a pair of diagonally distributed second positioning holes, a pair of diagonally distributed third positioning holes and a pair of diagonally distributed fourth positioning holes, the first positioning hole is opposite to the second positioning hole, and the third positioning hole is opposite to the fourth positioning hole.

3. A coated sand core-covered sand shell mold according to claim 2, characterized in that: The centers of the first mold, the second mold, the third mold and the fourth mold are respectively provided with a first casting process structure, a second casting process structure, a third casting process structure and a fourth casting process structure, the first casting process structure is connected to the second casting process structure, and the third casting process structure is connected to the fourth casting process structure.

4. The coated sand core-covered sand shell mold according to claim 3, characterized in that: The number of the cover core cavities is 4, and the 4 cover core cavities are distributed in a 2X2 pattern and are arranged close to a corner of the cover mold.

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