Precoated sand shell manufacturing mold for automobile rear suspension support

Abstract

The utility model relates to the technical field of precoated sand casting, in particular to a precoated sand shell-making mould for an automobile rear suspension support, which comprises an upper mould and a lower mould, the upper mould is provided with a deep cavity and a high platform along with a shape product, the deep cavity is provided with three convex ribs, sand shooting holes penetrating to the top of the upper mould are arranged in interval grooves of the convex ribs, and the upper mould is provided with a plurality of sand shooting holes penetrating to the top of the lower mould. A surrounding cavity is formed in three surfaces of the high platform, a first inverted conical cavity is formed in the top of the high platform, and a plurality of second inverted conical cavities are formed in the surrounding cavity; the lower die shape follow-up product is provided with a trapezoid table corresponding to the deep cavity and a bottom groove corresponding to the high table, and pattern dies corresponding to the surrounding cavity are arranged on the two sides of the bottom groove. According to the mold, part of the mold shell of a product can be rapidly prepared in a high-quality mode, the surface of the prepared mold shell is smooth, mold repairing is not needed, and then a cavity for casting the product is formed after the mold shell and a mold shell prepared through another mold are assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of coated sand casting, in particular to a coated sand shell making mold for an automobile rear suspension bracket. Background Art

[0002] Coated sand casting is a process that uses natural quartz sand as the original sand and phenolic resin, hexamine, and a reinforcing agent as raw materials to prepare a shell mold for casting. Because of its high strength, high surface finish of the shell mold, few casting process flows, and high production efficiency, it is often used for precision casting of larger workpieces. An automobile rear suspension bracket is currently cast using coated sand and requires a set of molds to prepare a coated sand shell mold for casting this complex structure product. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a coated sand shell making mold for an automobile rear suspension bracket aiming at the deficiencies of the prior art. The mold adopts an upper and lower die closing method, has no loose pieces, and can quickly produce high-quality shells.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a coated sand shell making mold for an automobile rear suspension bracket, which can prepare partial mold shells for casting products, including an upper mold and a lower mold. Both the upper mold and the lower mold are symmetrical molds. The upper mold is provided with a deep cavity with an isosceles trapezoid cross-section and a high platform forming a Z shape with the deep cavity along the shape of the product. The deep cavity is provided with three "U"-shaped ribs along the length direction, and sand injection holes penetrating to the top of the upper mold are arranged in the spaced grooves of the ribs. The three sides of the high platform are provided with enclosing cavities. The top of the high platform is provided with a rectangular groove penetrating the high platform horizontally, and a first inverted conical cavity with a large mouth and a small bottom is arranged at the center of the rectangular groove, that is, the center of the high platform. The enclosing cavity is provided with several second inverted conical cavities; the lower mold is provided with a trapezoidal platform corresponding to the deep cavity and a bottom groove corresponding to the high platform along the shape of the product, and mold patterns corresponding to the enclosing cavities are arranged on both sides of the bottom groove.

[0005] Preferably, the sand injection holes are 12 round holes arranged in a rectangle.

[0006] Preferably, the upper mold and the lower mold are provided with exhaust holes penetrating horizontally. The exhaust holes avoid the mold cavity and communicate with the mold cavity through air plugs.

[0007] Preferably, the upper mold and the lower mold are provided with guide posts and guide holes for facilitating die closing positioning.

[0008] Preferably, the lower mold is provided with pin shafts for forming through holes in the mold shell. The pin shafts are conical for facilitating mold release, and there are 8 pin shafts.

[0009] Preferably, the lower mold is provided with a letter mold for forming reverse characters in the mold shell.

[0010] The beneficial effects of the present utility model are as follows: A shell-making mold for coated sand of an automotive rear suspension bracket, which includes an upper mold and a lower mold. The upper mold is provided with a deep cavity having an isosceles trapezoidal cross-section and a high platform forming a Z-shape with the deep cavity along the shape of the product. The deep cavity is provided with three "U"-shaped ribs along the length direction, and sand injection holes penetrating to the top of the upper mold are arranged in the spaced grooves of the ribs. Three sides of the high platform are provided with enclosing cavities. The top of the high platform is provided with a rectangular groove penetrating the high platform horizontally, and a first inverted conical cavity with a large opening and a small bottom is arranged at the center of the rectangular groove, that is, the center of the high platform. The enclosing cavity is provided with a plurality of second inverted conical cavities. The lower mold is provided with a trapezoidal platform corresponding to the deep cavity and a bottom groove corresponding to the high platform along the shape of the product, and mold patterns corresponding to the enclosing cavities are arranged on both sides of the bottom groove. The mold of the present utility model can quickly and high-quality prepare partial mold shells of the product. The surface of the prepared mold shells is smooth and does not require mold repair. Then, after being assembled with the mold shells prepared by other molds, a cavity for casting the product is formed. Description of the Drawings

[0011] Figure 1 is a three-dimensional view of the upper mold of a shell-making mold for coated sand of an automotive rear suspension bracket according to the present utility model;

[0012] Figure 2 is another three-dimensional view of the upper mold of a shell-making mold for coated sand of an automotive rear suspension bracket according to the present utility model;

[0013] Figure 3 is a three-dimensional view of the lower mold of a shell-making mold for coated sand of an automotive rear suspension bracket according to the present utility model;

[0014] Figure 4 is a three-dimensional view of the mold shell of an automotive rear suspension bracket prepared by using the mold of the present utility model.

[0015] Description of the Reference Numerals:

[0016] 1 - upper mold, 11 - deep cavity, 12 - high platform, 13 - rib, 14 - sand injection hole, 15 - enclosing cavity, 16 - rectangular groove, 17 - first inverted conical cavity, 18 - second inverted conical cavity, 2 - lower mold, 21 - trapezoidal platform, 22 - bottom groove, 23 - mold pattern, 24 - dowel pin, 3 - exhaust hole, 4 - character mold. Detailed Embodiment

[0017] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments, and the scope of implementation of the present utility model is not limited thereto.

[0018] As Figures 1 to 3As shown in the figure, a shell-making mold made of coated sand for an automotive rear suspension bracket in this embodiment can prepare a partial mold shell for casting products, including an upper mold 1 and a lower mold 2. Both the upper mold 1 and the lower mold 2 are symmetric molds, that is, along the plane from one end clamping of the mold to the other end clamping direction, the mold is symmetric about this plane. The upper mold 1 is provided with a deep cavity 11 with an isosceles trapezoid cross-section and a high platform 12 forming a Z shape with the deep cavity 11 according to the shape of the product. The deep cavity 11 is provided with three "U"-shaped ribs 13 along the length direction, and sand injection holes 14 penetrating to the top of the upper mold 1 are arranged in the spaced grooves of the ribs 13. The three sides of the high platform 12 are provided with a surrounding cavity 15. The top of the high platform 12 is provided with a rectangular groove 16 penetrating horizontally through the high platform 12, and a first inverted conical cavity 17 with a large opening and a small bottom is arranged at the center of the rectangular groove 16, that is, the center of the high platform 12. The surrounding cavity 15 is provided with a number of second inverted conical cavities 18. The lower mold 2 is provided with a trapezoidal platform 21 corresponding to the deep cavity 11 and a bottom groove 22 corresponding to the high platform 12 according to the shape of the product. Mold patterns 23 corresponding to the surrounding cavity 15 are arranged on both sides of the bottom groove 22. The mold patterns 23 are continuous or discontinuous convex platforms with various shapes higher than the clamping surface of the lower mold 2.

[0019] This embodiment is specifically used for preparing a mold shell for the coated sand casting of an automotive rear suspension bracket. The coated sand casting of the automotive rear suspension bracket requires two assembled mold shells to form a mold cavity for casting. The mold in this embodiment can prepare one of the mold shells, that is, it can prepare the mold shell as Figure 4 shown. The upper mold 1 and the lower mold 2 are shaped according to the product, and a draft angle is set at the place where they are fitted with the mold shell. There is no loose piece in this mold. The upper mold 1 and the lower mold 2 are integrally formed. After clamping, sand injection, heating and pressurization can prepare a mold shell with a smooth surface, the same shape structure as the product, but the size specification is larger than the product by the thickness of one mold shell.

[0020] There are 12 sand injection holes 14, which are arranged at the highest point of the mold cavity after clamping, so that the resin sand can easily fill the cavity fully. The upper mold 1 and the lower mold 2 are provided with exhaust holes 3 penetrating horizontally. The exhaust holes 3 are connected to the mold cavity through air plugs, so that a certain pressure can be maintained in the cavity, promoting the mold shell to be more dense.

[0021] To facilitate the subsequent combined assembly of the mold shell made in this embodiment, the lower mold 2 is provided with a dowel pin 24 forming a through hole in the mold shell. The dowel pin 24 is conical for easy draft. There are 8 dowel pins 24. In addition, the lower mold 2 is provided with a letter mold 4 forming an inverted character in the mold shell.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, and for the convenience of describing the technical solution, the front, rear, left, right, top, middle, and bottom directions adopted are based on the settings in the accompanying drawings, rather than limiting the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A coated sand shell mold for a rear suspension bracket of an automobile, characterized in that: It can be used to prepare a partial mold shell for casting products, including an upper mold and a lower mold. Both the upper mold and the lower mold are symmetric molds. The upper mold is provided with a deep cavity with an isosceles trapezoid cross-section and a high platform that forms a Z-shape with the deep cavity according to the shape of the product. The deep cavity is provided with three "凵"-shaped convex ribs along the length direction, and sand injection holes penetrating to the top of the upper mold are arranged in the spacer grooves of the convex ribs. The three sides of the high platform are provided with enclosing cavities. The top of the high platform is provided with a rectangular groove penetrating the high platform horizontally, and a first inverted conical cavity with a large opening and a small bottom is arranged at the center of the rectangular groove, that is, the center of the high platform. The enclosing cavity is provided with a number of second inverted conical cavities; the lower mold is provided with a trapezoidal platform corresponding to the deep cavity and a bottom groove corresponding to the high platform according to the shape of the product, and mold patterns corresponding to the enclosing cavities are arranged on both sides of the bottom groove.

2. The coated sand shell mold for automobile rear suspension bracket according to claim 1, characterized in that: The sand injection holes are 12 round holes arranged in a rectangular pattern.

3. The coated sand shell mold for automobile rear suspension bracket according to claim 1, characterized in that: The upper mold and the lower mold are provided with exhaust holes penetrating horizontally.

4. The coated sand shell mold for automobile rear suspension bracket according to claim 1, characterized in that: The upper mold and the lower mold are provided with guide columns and guide holes for facilitating mold clamping and positioning.

5. The coated sand shell mold for automobile rear suspension bracket according to claim 1, characterized in that: The lower mold is provided with stud pins that form through holes in the mold shell. The stud pins are conical for facilitating mold withdrawal, and there are 8 stud pins.

6. The coated sand shell mold for automobile rear suspension bracket according to claim 1, characterized in that: The lower mold is provided with a letter mold that forms reverse characters in the mold shell.

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