Die-casting mold sand core assembling structure

Abstract

A die-casting die sand core assembling structure comprises a lower fixed die, a side die and a sand core, a sand core positioning groove is formed in the lower fixed die, a positioning head of the sand core is installed in the sand core positioning groove, an opening is formed in the groove wall of the side, adjacent to the side die, of the sand core positioning groove, and the bottom of the opening and the groove bottom of the sand core positioning groove are located on the same plane. A sand guide groove is formed between the side wall, in contact with the side mold, of the lower fixed mold and the opening of the sand core positioning groove; and the width of the sand guide groove is the same as that of the bottom of the opening.

Description

Technical Field

[0001] This utility model relates to the field of sand cores, specifically to the assembly structure of sand cores for die casting molds. Background Technology

[0002] The engine cylinder head contains various complex air passages, water passages, and other structures. Therefore, during the die casting process, a sand core needs to be installed within the die casting mold to form these structures. However, in existing casting processes, the sand core assembly structure between the sand core and the die casting mold presents the following problems:

[0003] 1. Because the positioning head of the sand core is easy to remain in the sand core positioning groove of the die casting mold, when the operator cleans the residual sand in the sand core positioning groove with a high-pressure air gun after the die casting is completed and the mold is removed, the residual sand will fly around and it will be difficult to clean the residual sand in the sand core positioning groove.

[0004] 2. Regarding the gap between the sand core and the die-casting mold, theoretically, the smaller the gap, the better. However, excessively tightening the die-casting mold to achieve a small gap can cause sand to fall off the sand core or even cause it to break. On the other hand, not tightening the die-casting mold too much will result in an excessive gap between the mold and the sand core, causing the sand core to float and resulting in dimensional defects in the die-cast product. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a die-casting mold sand core assembly structure. It involves opening an opening in the sand core positioning groove on the lower fixed mold and the groove wall adjacent to the side mold. After the side mold retracts, a portion of the residual sand in the sand core positioning groove is directly discharged from the lower fixed mold through the opening and sand guide groove. The remaining portion is discharged from the lower fixed mold by the operator using a high-pressure air gun through the opening and sand guide groove, ensuring that the residual sand is completely cleaned and preventing the problem of residual sand flying around.

[0006] The technical solution of this utility model is as follows: a die-casting mold sand core assembly structure, including a lower fixed mold, a side mold, and a sand core. The lower fixed mold is provided with a sand core positioning groove, and the positioning head of the sand core is installed in the sand core positioning groove. The groove wall of the sand core positioning groove adjacent to the side mold is provided with an opening. The bottom of the opening is on the same plane as the bottom of the sand core positioning groove. A sand guide groove is provided between the side wall of the lower fixed mold that contacts the side mold and the opening of the sand core positioning groove. The width of the sand guide groove is the same as the width of the bottom of the opening.

[0007] Preferably, the forming part of the sand core is provided with at least one sand core protrusion, and each sand core protrusion is provided with a sand accumulation groove on the side away from the side mold.

[0008] Preferably, the width of the opening is 1 / 3 to 2 / 3 of the width of the sand core positioning groove.

[0009] Preferably, the cross-section of the opening is rectangular or trapezoidal.

[0010] Preferably, the bottom of the sand guide groove is a slope, with the highest point flush with the bottom of the opening.

[0011] Furthermore, the bottom inclination angle of the sand guide groove is 2 to 10°.

[0012] The advantages of this utility model are:

[0013] 1. This utility model solves the problems of residual sand flying around and not being cleaned properly by opening the sand core positioning groove on the lower fixed mold and the groove wall adjacent to the side mold. After the side mold is retracted, the operator can use a high-pressure air gun to completely remove the residual sand through the opening in the groove wall of the sand core positioning groove and the sand guide groove.

[0014] 2. This utility model provides a sand core protrusion and a sand accumulation groove on the contact surface between the sand core and the side mold. When the side mold moves, the sand core protrusion can be pushed into the sand accumulation groove, ensuring an interference fit between the side mold and the sand core. This ensures a suitable gap between the side mold and the sand core, avoiding the problem of the sand core floating due to a large gap, which would cause the die-cast product to have inconsistent dimensions. It also avoids the problem of sand core falling off or even sand core breaking that occurs when the gap between the side mold and the sand core is small using traditional methods. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the lower mold structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the sand core structure of this utility model;

[0018] Figure 4 for Figure 3 AA sectional view. Detailed Implementation

[0019] See Figures 1 to 4A die-casting mold sand core assembly structure includes a lower fixed mold 1, a side mold 2, and a sand core 3. The lower fixed mold 1 is provided with a sand core positioning groove 11, and the positioning head 31 of the sand core 3 is installed in the sand core positioning groove 11. The groove wall of the sand core positioning groove 11 adjacent to the side mold 2 is provided with an opening 111. The width of the opening 11 is 1 / 3 to 2 / 3 of the width of the sand core positioning groove 11. If the width of the opening 111 is too small, it is not easy for residual sand to flow out or be blown out. If the width of the opening 111 is too large, it will affect the support strength of the side wall where the opening 111 is located, causing the positioning head 31 of the sand core 3 to fall out. The cross-section of the opening 111 is rectangular or trapezoidal, which is simple to process and ensures the function of the opening 111 while also ensuring the strength of the groove wall. The bottom of the opening 111 is on the same plane as the bottom of the sand core positioning groove 11, ensuring that residual sand in the sand core positioning groove 11 can flow out or be blown out through the opening 111. A sand guide groove 12 is provided between the side wall of the lower mold 1 that contacts the side mold 2 and the opening 111 of the sand core positioning groove 11. The bottom of the sand guide groove 12 is a slope, and the highest point is flush with the bottom of the opening 111. The inclination angle of the bottom of the sand guide groove 12 is 2 to 10°. The purpose of this design is to ensure that the residual sand in the sand core positioning groove 11 can automatically flow out with the sand guide groove 12. The width of the sand guide groove 12 is the same as the width of the bottom of the opening 111, ensuring that the residual sand in the sand core positioning groove 11 can enter the sand guide groove 12 through the opening 111. The forming part 32 of the sand core 3 is provided with at least one sand core protrusion 321. In this embodiment, one sand core protrusion 321 is provided. The side of the sand core protrusion 321 away from the side mold 2 is provided with a sand accumulation groove 322. When the side mold 2 moves, the side mold 2 contacts the forming part 32 of the sand core and moves along the forming part 32. During the movement, the side mold 2 contacts the sand core protrusion 321 provided on the forming part 32 and pushes the sand core protrusion 321 into the sand accumulation groove 322, thereby ensuring that the side mold 2 and the sand core 3 achieve an interference fit, preventing the sand core 3 from floating up, and also preventing the sand core 3 from being crushed.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A die-casting mold sand core assembly structure, comprising a lower fixed mold (1), a side mold (2), and a sand core (3), wherein the lower fixed mold (1) is provided with a sand core positioning groove (11), and the positioning head (31) of the sand core (3) is installed in the sand core positioning groove (11), characterized in that: The sand core positioning groove (11) has an opening (111) on the side wall adjacent to the side mold (2). The bottom of the opening (111) is on the same plane as the bottom of the sand core positioning groove (11). A sand guide groove (12) is provided between the side wall of the lower mold (1) that contacts the side mold (2) and the opening (111) of the sand core positioning groove (11). The width of the sand guide groove (12) is the same as the width of the bottom of the opening (111).

2. The die-casting mold sand core assembly structure according to claim 1, characterized in that: The forming part (32) of the sand core (3) is provided with at least one sand core protrusion (321), and a sand accumulation groove (322) is provided on the side of the sand core protrusion (321) away from the side mold (2).

3. The die-casting mold sand core assembly structure according to claim 1, characterized in that: The width of the opening (111) is 1 / 3 to 2 / 3 of the width of the sand core positioning groove (11).

4. The die-casting mold sand core assembly structure according to claim 1, characterized in that: The cross-section of the opening (111) is rectangular or trapezoidal.

5. The die-casting mold sand core assembly structure according to claim 1, characterized in that: The bottom of the sand guide groove (12) is a slope, and the highest point is flush with the bottom of the opening (111).

6. The die-casting mold sand core assembly structure according to claim 5, characterized in that: The bottom inclination angle of the sand guide groove (12) is 2 to 10°.

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