Precoated sand three-box process mold

Abstract

The utility model belongs to the field of precoated sand molds, and provides a precoated sand three-box process mold which comprises a middle box mold, an upper box mold and a lower box mold. The first upper mold and the first lower mold comprise a first butterfly-shaped cavity, a second butterfly-shaped cavity, a first sand shooting opening, a first casting process column, a second casting process column, a middle box blocking plate cavity and a pair of convex surfaces corresponding to the middle box blocking plate cavity, and second sand shooting openings are formed in the convex surfaces and the tail part of the middle box blocking plate cavity; the upper and lower box mold comprises a second upper mold and a second lower mold, and the second upper mold and the second lower mold further comprise a third butterfly cavity, a fourth butterfly cavity, a third sand shooting opening, a third casting process column and a fourth casting process column. The device is reasonable in design, simple in structure, capable of correspondingly producing two sets of sand shells, beneficial to production of high-quality casting products and suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model belongs to the field of coated sand moulds, in particular to a coated sand three-box process 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 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 casting port, which can slowly volatilize the resin 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 casting port on the sand shell. The casting liquid is poured in from the casting port. However, the cooling casting is prone to flash and burrs, especially for special-shaped parts on automobiles. The casting 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 large and the productivity is low, and the production cost is high. Practice has proved that after the traditional sand core casting is changed to a three-box (upper box, middle box and lower box) process, it can not only cast multiple castings of the same special-shaped part at one time, ensure product quality, save costs, but also greatly improve production efficiency and reduce the generation of flash and burrs. Among them, the upper box and the lower box use the same sand shell structure, and the middle box is another set of sand shell structure. Therefore, it is necessary to design two sets of coated sand molds for the upper box, the lower box and the middle box. Utility Model Content

[0004] Aiming at the technical problems existing in the above-mentioned coated sand mould, the utility model proposes a coated sand three-box process mould which has a reasonable design, corresponds to the production of two sets of sand shells and is conducive to the production of high-quality casting products.

[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 three-box process mold, including a middle box mold and an upper and lower box molds, the middle box mold and the upper and lower box molds are respectively provided with a middle box sand shell positioning hole and an upper and lower box sand shell positioning hole, the middle box mold includes a first upper mold and a first lower mold, the first upper mold and the first lower mold are respectively provided with a first butterfly cavity and a second butterfly cavity, the tails of the first butterfly cavity and the second butterfly cavity are provided with a first sand shooting port, the first butterfly cavity and the second butterfly cavity are respectively provided with a first casting process column and a second casting process column, and the tail sides of the second butterfly cavity A pair of middle box plugging plate cavities are provided, and a pair of convex surfaces corresponding to the middle box plugging plate cavities are provided on both sides of the tail of the first butterfly cavity, and second sand shooting ports are provided at the tail of the convex surface and the middle box plugging plate cavity, and the surface after the convex surface is connected with the middle box plugging plate cavity is used for sand shooting to form the middle box plugging plate; the upper and lower box molds include a second upper mold and a second lower mold, and a third butterfly cavity and a fourth butterfly cavity are respectively provided on the second upper mold and the second lower mold, and a plurality of third sand shooting ports distributed side by side are provided at the heads of the third butterfly cavity and the fourth butterfly cavity, and a third casting process column and a fourth casting process column are respectively provided in the third butterfly cavity and the fourth butterfly cavity.

[0006] Preferably, the first butterfly cavity includes a plugging plate positioning convex shape for assembling the middle box plugging plate.

[0007] Preferably, the bottom of the first butterfly cavity and the second butterfly cavity are provided with sealing track grooves distributed around the circumference of their inner walls, and the bottom of the third butterfly cavity and the fourth butterfly cavity are provided with sealing track strips distributed around the circumference of their inner walls, and the sealing track strips are used to mate with the sealing track grooves.

[0008] Preferably, the blocking plate positioning protrusion has a thickness higher than the sealing track groove and interrupts the sealing track groove.

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

[0010] 1. The utility model provides a coated sand three-box process mold. The upper and lower box molds can be used to perform sand shooting molding on the sand shells of the upper and lower boxes, and the middle box mold can be used to perform sand shooting molding on the sand shell of the middle box. The upper and lower surfaces of the sand shooting molding of the upper and lower box molds can be used as different cavity surfaces of two sets of castings to match the upper and lower surfaces of the sand shooting molding of the middle box mold, thereby meeting the casting requirements of the three-box process, thereby improving the efficiency of casting production, and ensuring that the mold has a high utilization rate. The device has a reasonable design, a simple structure, corresponds to the production of two sets of sand shells, and is conducive to the production of high-quality casting products, 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 top view of a middle box mold provided in an embodiment;

[0013] Figure 2 A top view of the upper and lower box molds provided in the embodiment;

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

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

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

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

[0018] Figure 7 This is the exploded view of the sand shell of the three-box process of coated sand;

[0019] Figure 8 This is the sand shell working diagram of the three-box process of coated sand;

[0020] In the above figures: 1. middle box mold; 11. middle box sand shell positioning hole; 12. first upper mold; 13. first lower mold; 14. first butterfly cavity; 141. plugging plate positioning convex; 15. second butterfly cavity; 16. first sand shooting port; 17. first casting process column; 18. second casting process column; 19. middle box plugging plate cavity; 110. convex surface; 111. second sand shooting port; 112. sealing track groove; 12. upper and lower box molds; 21. upper and lower box sand shell positioning holes; 22. second upper mold; 23. second lower mold; 24. third butterfly cavity; 25. fourth butterfly cavity; 26. third sand shooting port; 27. third casting process column; 28. fourth casting process column; 29. ​​sealing track bar; 3. upper box; 4. lower box; 5. middle box; 6. middle box plugging plate. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Examples, such as Figures 1 to 8 As shown, the utility model provides a coated sand three-box process mold, including a middle box mold 1 and an upper and lower box molds 2, the middle box mold 1 and the upper and lower box molds 2 are respectively provided with a middle box sand shell positioning hole 11 and an upper and lower box sand shell positioning hole 21, the middle box mold 1 includes a first upper mold 12 and a first lower mold 13, the first upper mold 12 and the first lower mold 13 are respectively provided with a first butterfly cavity 14 and a second butterfly cavity 15, the tail of the first butterfly cavity 14 and the second butterfly cavity 15 is provided with a first sand shooting port 16, the first butterfly cavity 14 and the second butterfly cavity 15 are respectively provided with a first casting process column 17 and a second casting process column 18, a pair of middle box blocking plate cavities 19 are provided on both sides of the tail of the second butterfly cavity 15, the first butterfly A pair of convex surfaces 110 corresponding to the middle box plugging plate cavity 19 are arranged on both sides of the tail of the butterfly cavity 14, and a second sand shooting port 111 is arranged at the tail of the convex surface 110 and the middle box plugging plate cavity 19, and the mold surface after the convex surface 110 and the middle box plugging plate cavity 19 are connected is used for sand shooting to form the middle box plugging plate 6; the upper and lower box molds 2 include a second upper mold 22 and a second lower mold 23, and the second upper mold 22 and the second lower mold 23 are respectively provided with a third butterfly cavity 24 and a fourth butterfly cavity 25, and the heads of the third butterfly cavity 24 and the fourth butterfly cavity 25 are provided with a plurality of third sand shooting ports 26 distributed side by side, and the third butterfly cavity 24 and the fourth butterfly cavity 25 are respectively provided with a third casting process column 27 and a fourth casting process column 28. Among them, the first sand shooting port 16, the second sand shooting port 111 and the third sand shooting port 26 are the sand shooting nodes of the core shooting machine; the positions of the first casting process column 17, the second casting process column 18, the third casting process column 27 and the fourth casting process column 28 are hollow structures after sand shooting molding, and the hollow structure forms a casting channel that is integrated from top to bottom after the upper box 3, the middle box 5 and the lower box 4 are assembled.

[0024] Specifically, the upper and lower box molds 2 can be used to perform sand shooting molding on the sand shells of the upper box 3 and the lower box 4, and the middle box mold 1 can be used to perform sand shooting molding on the sand shell of the middle box 5. In the upper and lower box molds 2, the sand shell produced by the sand shooting molding has two upper and lower molding surfaces, and the sand shell produced by the middle box mold 1 also has two upper and lower molding surfaces, and also produces a pair of middle box plugging plates 6. In the three-box process, two sand shells shot by the upper and lower box molds 2, a sand shell shot by the middle box mold 1, and a pair of middle box plugging plates 6 for blocking the structural holes on the latter sand shell are used, and after the three sand shells are butt-jointed up and down, four different molding surfaces participate in the casting, and the casting is completed by the same pouring channel in the center of the three sand shells, thereby producing two sets of castings at the same time, thereby meeting the casting requirements of the three-box process, thereby improving the efficiency of casting production, and ensuring that the mold has a high utilization rate, especially the mold of the upper and lower box molds 2 that simultaneously produces the upper box 3 and the lower box 4. Therefore, the device produces two sets of sand shells and is conducive to the production of high-quality casting products, with strong practicality and high utilization rate.

[0025] In order to improve the quality of castings, the first butterfly cavity 14 provided by the utility model includes a plugging plate positioning convex shape 141 for assembling the middle box plugging plate 6, and a positioning countersunk is provided on the sand shell after sand shooting molding, which cooperates with the middle box plugging plate 6, and under the molding action of the convex surface 110 and the middle box plugging plate cavity 19, the concave shape in the middle of the middle box plugging plate 6 can match the columnar structure of the upper box 3, thereby ensuring the stability of the middle box plugging plate 6 during the pouring process and meeting the casting needs of a complete set of castings.

[0026] In order to improve the quality of the upper and lower docking of the upper box 3, the middle box 5 and the lower box 4, the utility model is provided with sealing track grooves 112 distributed around the circumference of the inner wall at the bottom of the first butterfly cavity 14 and the second butterfly cavity 15, and the third butterfly cavity 24 and the fourth butterfly cavity 25 are provided with sealing track strips 29 distributed around the circumference of the inner wall at the bottom, and the sealing track strips 29 are used to be plugged with the sealing track grooves 112. In this way, the upper and lower mold surfaces of the middle box 5 after sand shooting molding have sealing protrusions, and the bottom surface of the upper box 3 and the top surface of the lower box 4 have sealing grooves that match the sealing protrusions, thereby ensuring better docking quality after docking, and the sealing reliability is high, which is conducive to improving the molding quality of the casting.

[0027] Furthermore, the thickness of the blocking plate positioning convex shape 141 provided by the utility model is higher than the sealing track groove 112 and interrupts the sealing track groove 112, so as not to affect the forming of the positioning countersunk on the sand shell of the final middle box 5, so as to ensure that the middle box blocking plate 6 can be blocked in the positioning countersunk on the top of the middle box 5 in a concealed assembly manner.

[0028] 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 three-box process mold, comprising a middle box mold and upper and lower box molds, wherein the middle box mold and the upper and lower box molds are respectively provided with a middle box sand shell positioning hole and an upper and lower box sand shell positioning hole, characterized in that: The middle box mold comprises a first upper mold and a first lower mold, the first upper mold and the first lower mold are respectively provided with a first butterfly cavity and a second butterfly cavity, the tails of the first butterfly cavity and the second butterfly cavity are provided with a first sand shooting port, the first butterfly cavity and the second butterfly cavity are respectively provided with a first casting process column and a second casting process column, a pair of middle box plugging plate cavities are provided on both sides of the tail of the second butterfly cavity, a pair of convex surfaces corresponding to the middle box plugging plate cavities are provided on both sides of the tail of the first butterfly cavity, the tail of the convex surface and the tail of the middle box plugging plate cavity are provided with a second sand shooting port, and the surface after the convex surface is butted with the middle box plugging plate cavity is used for sand shooting to form the middle box plugging plate; The upper and lower box molds include a second upper mold and a second lower mold, and the second upper mold and the second lower mold are respectively provided with a third butterfly cavity and a fourth butterfly cavity, and the heads of the third butterfly cavity and the fourth butterfly cavity are provided with a plurality of third sand shooting ports distributed side by side, and the third butterfly cavity and the fourth butterfly cavity are respectively provided with a third casting process column and a fourth casting process column.

2. The coated sand three-box process mold according to claim 1, characterized in that: The first butterfly cavity includes a plugging plate positioning convex shape for assembling the middle box plugging plate.

3. The coated sand three-box process mold according to claim 2, characterized in that: The bottoms of the first and second butterfly cavities are provided with sealing track grooves distributed around the circumference of their inner walls, and the bottoms of the third and fourth butterfly cavities are provided with sealing track strips distributed around the circumference of their inner walls, and the sealing track strips are used to mate with the sealing track grooves.

4. The coated sand three-box process mold according to claim 3, characterized in that: The blocking plate positioning convex shape has a thickness higher than the sealing track groove and interrupts the sealing track groove.

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