Die-casting die

Abstract

The utility model relates to a die-casting die, which belongs to the field of die-casting dies and comprises a movable die component and a static die. Die-casting cavities are respectively formed in the opposite surfaces of the static die and the movable die assembly; an injection nozzle communicated with the die-casting cavity is arranged on the static die; a U-shaped cooling water cavity is formed in the injection nozzle; the movable mold assembly comprises a movable mold base, a push plate, a push rod fixing plate, a cylindrical push rod, a reset push rod, a demolding push rod and a movable mold body; the die-casting cavity is formed in the movable die body; the push rod fixing plate, the push plate and the movable mold base are sequentially arranged on the movable mold body from inside to outside; according to the injection nozzle structure disclosed by the utility model, the structures of the movable mold assembly and the static mold are combined, so that the technical problems that the injection nozzle is easy to strain and pock marks occur are effectively solved, the service life of the injection nozzle is prolonged, the bonding between a die casting and the static mold is reduced, the demolding efficiency is improved, and the integrity of the casting is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of die casting moulds, and specifically relates to a die casting mould. Background Art

[0002] Pressure casting, also known as die casting, is a casting method in which molten alloy liquid is poured into a mold, filling the mold cavity at high speed, and causing the alloy liquid to solidify under pressure to form a casting.

[0003] In existing die-casting molds, the service life of the injection nozzles that come with the gate guide cone is short. The longest one can be used for one month, and most of them can only be used for about 15 days before they are damaged. Frequent shutdowns are required to replace the injection nozzle accessories, which increases the die-casting cost and affects the work efficiency of die-casting. In addition, during demolding, the die-casting parts are prone to sticking to the static mold in the injection nozzle area, resulting in incomplete demolding, which not only reduces the demolding efficiency, but also affects the appearance and pass rate of the castings. Summary of the invention

[0004] In response to the problem of short service life of the injection nozzle, the inventor analyzed the damaged injection nozzle and found that the main reason for the damage of the injection nozzle is the cyclic impact of high-temperature molten metal on the injection nozzle, coupled with uneven heat transfer of the mold and uneven temperature of the injection nozzle, the inner cavity surface is easily scratched or surface pitting occurs, which increases the demolding resistance between the die-casting and the injection nozzle, which is not conducive to the separation of the die-casting gate and the injection nozzle when the die-casting mold is opened, resulting in the adhesion of the die-casting to the static mold, incomplete demolding, and easy damage to the injection nozzle.

[0005] Based on this discovery, the utility model provides a die-casting mold. By arranging a U-shaped cooling water channel in the injection nozzle area and combining the structure of the dynamic mold assembly and the static mold, the technical problems of easy strain and pitting of the injection nozzle are effectively solved, the service life of the injection nozzle is improved, and the adhesion between the die-casting and the static mold is reduced, the demolding efficiency is improved, the integrity of the casting is ensured, and the qualified rate of the casting is improved.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] The die-casting mold comprises a movable mold assembly and a static mold 14; the static mold 14 and the movable mold assembly have opposite surfaces respectively provided with a die-casting cavity 13; the static mold 14 is provided with a nozzle 15 connected with the die-casting cavity 13; the nozzle 15 is provided with a U-shaped cooling water cavity 16; the movable mold assembly comprises a movable mold base 1, a push plate 2, a push rod fixing plate 3, a cylindrical push rod 5, a reset push rod 9, a demoulding push rod 10 and a movable mold body 4; the die-casting cavity 13 is provided on the movable mold body 4; On the opposite side of the die-casting cavity 13 of the movable mold body 4, the push rod fixing plate 3, the push plate 2 and the movable mold base 1 are arranged in sequence from the inside to the outside; the cylindrical push rod 5 passes through the movable mold base 1 and is fixedly connected with the push plate 2; the inner ends of the reset push rod 9 and the demoulding push rod 10 are respectively fixedly connected with the push rod fixing plate 3, wherein the demoulding push rod 10 is slidably connected with the movable mold body 4 and can freely pass through the die-casting cavity 13; the reset push rod 9 is slidably connected with the movable mold body 4 and is arranged to avoid the die-casting cavity 13.

[0008] Preferably, a connecting plate 18 is provided between the movable mold base 1 and the movable mold body 4, and the connecting plate 18 is connected to the left and right sides of the movable mold base 1 and the movable mold body 4; the push plate 2 and the push rod fixing plate 3 are freely slidably arranged between the two connecting plates.

[0009] Preferably, a push plate guide block 7 for limiting the push plate 2 and the push rod fixing plate 3 is provided between the movable mold base 1 and the movable mold body 4; two plate guide blocks 7 are provided, which are symmetrically arranged on the front and rear sides of one of the connecting plates 18.

[0010] Preferably, positioning guide pillars 6 are provided on the opposite surfaces of the movable mold body 4 and the static mold 14 ; and positioning guide holes 17 opposite to the positioning guide pillars 6 are opened on the static mold 14 .

[0011] Preferably, a cooling water channel is provided in the movable mold body 4; a cooling water channel is also provided in the static mold 14.

[0012] Preferably, an overflow groove 12 is provided on the side of the die casting cavity 13 .

[0013] Preferably, a demoulding push rod 10 is also provided in the overflow groove 12 and can pass freely.

[0014] Preferably, a guide cone 11 facing the injection nozzle 15 is provided in the die-casting cavity 13 of the movable mold body 4 .

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a U-shaped cooling water chamber on the injection nozzle, so that the temperature of the injection nozzle is balanced when pouring molten metal, thereby avoiding strain and surface pitting of the injection nozzle caused by temperature imbalance; in addition, the structure of the U-shaped cooling water chamber can increase the cold water circulation volume and has a better cooling effect. The U-shaped cooling water chamber enables the injection nozzle to have sufficient space for thermal expansion and contraction, especially during demolding, which has a better shrinkage amount and is more conducive to mold demolding, effectively avoiding the adhesion of the existing mold in the injection nozzle area during demolding, reducing the resistance of the die casting and the damage of the injection nozzle, and prolonging the service life of the injection nozzle. At the same time, the demolding integrity and surface smoothness of the casting are improved.

[0017] The injection nozzle structure of the utility model, combined with the structure of the dynamic mold assembly and the static mold, effectively solves the technical problems of easy strain and pitting of the injection nozzle, prolongs the service life of the injection nozzle, reduces the adhesion between the die casting and the static mold, improves the demoulding efficiency, ensures the integrity of the casting, and improves the qualified rate of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model (view direction 1);

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model (view direction 2);

[0020] Figure 3 It is a schematic diagram of the overall structure of the utility model (view direction three);

[0021] Figure 4 This is a cross-sectional view of the injection nozzle structure of the utility model;

[0022] Figure 5 It is a perspective view of the utility model;

[0023] In the figure, 1. movable mold base, 2. push plate, 3. push rod fixing plate, 4. movable mold body, 5. cylindrical push rod, 6. positioning guide column, 7. push plate guide block, 8. cooling water inlet, 9. reset rod, 10. demoulding push rod, 11. guide cone, 12. overflow groove, 13. die casting cavity, 14. static mold, 15. injection nozzle, 16. U-shaped cooling water cavity, 17. positioning guide hole, 18-connecting plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0025] In the description of the present invention, unless otherwise specified, the terms "front", "rear", "left", "right", "inside", "outside", etc., indicating directions or state relationships, are based on the directions or state relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0027] like Figure 1-5 As shown, the die-casting mold includes a movable mold assembly and a static mold 14.

[0028] The movable mold assembly includes a movable mold base 1, a push plate 2, a push rod fixing plate 3, a cylindrical push rod 5, a reset push rod 9, a demoulding push rod 10 and a movable mold body 4. The opposite surfaces of the movable mold body 4 and the static mold 14 are respectively provided with opposite die-casting cavities 13, and the static mold 14 is provided with a pressure injection nozzle 15 connected with the die-casting cavity 13. This mold is used in conjunction with a hot chamber die-casting machine. The movable mold base 1 is installed on the base of the movable mold plate of the die-casting machine, and the static mold 14 is installed on the fixed mold plate of the die-casting machine. When the die-casting machine clamping mechanism clamps the mold, the movable mold assembly moves toward the static mold 14 to complete the clamping action. After the movable mold assembly and the static mold 14 are relatively pressed, the die-casting cavity 13 of the two forms a complete sealed die-casting cavity, and the metal melt is injected into the die-casting cavity 13 through the pressure injection nozzle 15. The die casting cavity 13 of the movable mold body 4 is provided with a guide cone 11 facing the injection nozzle 15, and the guide cone 11 is used to guide the metal melt injected from the injection nozzle 15 into the die casting cavity 13. The side of the die casting cavity 13 is provided with an overflow groove 12. Positioning guide pillars 6 and positioning guide holes 17 are respectively set on the opposite surfaces of the movable mold body 4 and the static mold 14.

[0029] The push rod fixing plate 3, the push plate 2 and the movable mold base 1 are sequentially arranged from the inside to the outside on the opposite sides of the die casting cavity 13 of the movable mold body 4. The movable mold base 1 is connected to the left and right sides of the movable mold body 4 (with the attached Figure 1 The push plate 2 and the push rod fixing plate 3 are freely slidably arranged between the two connecting plates. A push plate guide block 7 for limiting the push plate 2 and the push rod fixing plate 3 in the front and rear directions to prevent the two from falling is also provided between the movable mold base 1 and the movable mold body 4. Two push plate guide blocks 7 are provided, which are symmetrically arranged on the front and rear sides of one of the connecting plates 18.

[0030] The cylindrical push rod 5 passes through the movable mold base 1 and is fixedly connected to the push plate 2. The inner ends of the reset push rod 9 and the demoulding push rod 10 are respectively fixedly connected to the push rod fixing plate 3, wherein the demoulding push rod 10 is slidably connected to the movable mold body 4 and can freely pass through the die casting cavity 13 and the overflow groove 12. The reset push rod 9 is slidably connected to the movable mold body 4 and is arranged to avoid the die casting cavity 13. When the mold is closed and the movable mold body 4 and the static mold 14 are pressed, the reset push rod 9 is pushed outward by the static mold 14 (moves toward the movable mold base 1), and drives the push rod fixing plate 3 to move outward. The outward movement of the push rod fixing plate 3 drives the demoulding push rod 10 and the push plate 2 to move outward. When the movable mold body 4 and the static mold 14 are pressed, the demoulding push rod 10 retreats to be flush with the inner bottom of the die casting cavity 13. After the molten metal is poured into the die-casting cavity 13 and cooled, the die-casting machine moves the template base to push the cylindrical push rod 5 inward, thereby driving the push plate 2 and the push rod fixing plate 3 to move inward. The inward movement of the push rod fixing plate 3 drives the demolding push rod 10 to move inward, thereby demolding the cooled casting from the die-casting cavity 13.

[0031] Cooling water channels are provided in both the movable mold body 4 and the static mold 14. Cooling water is injected into the cooling water channels through the cold water inlet 8 to cool the mold.

[0032] Since the high-temperature molten metal will have an impact on the injection nozzle 15 due to the periodic circulation, and the mold has uneven heat transfer, the temperature of the injection nozzle 15 is uneven. For this reason, a U-shaped cooling water chamber 16 is arranged in the injection nozzle 15. Compared with the existing cold water channel structure, when pouring the molten metal, the U-shaped cooling water chamber 16 has a larger cooling water circulation volume, so that the temperature of the injection nozzle 15 is balanced, and the injection nozzle 15 is avoided from being strained and pitted on the surface due to uneven temperature; in addition, the U-shaped cooling water chamber provides the injection nozzle 15 with sufficient space for thermal expansion and contraction, especially during demolding, it has a better shrinkage amount, is more conducive to the demolding of the mold, effectively avoids the adhesion of the existing mold in the injection nozzle area during demolding, reduces the resistance of the die casting and the damage of the injection nozzle 15, and increases the service life of the injection nozzle 15, while improving the demolding integrity and surface smoothness of the casting. Through practical application, it is found that after adding the U-shaped cooling water chamber 16, the problem of pitting of the injection nozzle 15 is greatly reduced. When demolding after the melt is cooled, the adhesion between the die casting and the injection nozzle area is significantly reduced, and the appearance of the casting is improved.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A die-casting mold, characterized in that: The invention comprises a movable mold assembly and a static mold (14); the static mold (14) and the movable mold assembly are provided with a die-casting cavity (13) on opposite surfaces thereof; a nozzle (15) is provided on the static mold (14) and is communicated with the die-casting cavity (13); a U-shaped cooling water cavity (16) is provided in the nozzle (15); the movable mold assembly comprises a movable mold base (1), a push plate (2), a push rod fixing plate (3), a cylindrical push rod (5), a reset push rod (9), a demoulding push rod (10) and a movable mold body (4); the die-casting cavity (13) is provided on the movable mold body (4); The push rod fixing plate (3), the push plate (2) and the movable mold base (1) are arranged in sequence from the inside to the outside on the opposite side of the die casting cavity (13) of the movable mold (4); the cylindrical push rod (5) passes through the movable mold base (1) and is fixedly connected to the push plate (2); the inner ends of the reset push rod (9) and the demoulding push rod (10) are respectively fixedly connected to the push rod fixing plate (3), wherein the demoulding push rod (10) is slidably connected to the movable mold body (4) and can freely pass through the die casting cavity (13); the reset push rod (9) is slidably connected to the movable mold body (4) and is arranged to avoid the die casting cavity (13).

2. The die-casting mold according to claim 1, characterized in that: A connecting plate (18) is provided between the movable mold base (1) and the movable mold body (4), and the connecting plate (18) is connected to the left and right sides of the movable mold base (1) and the movable mold body (4); the push plate (2) and the push rod fixing plate (3) are freely slidably arranged between the two connecting plates.

3. The die-casting mold according to claim 2, characterized in that: A push plate guide block (7) for limiting the position of the push plate (2) and the push rod fixing plate (3) is also provided between the movable mold base (1) and the movable mold body (4); two plate guide blocks (7) are provided, which are symmetrically arranged on the front and rear sides of one of the connecting plates (18).

4. The die-casting mold according to claim 1, characterized in that: Positioning guide pillars (6) are provided on the opposing surfaces of the movable mold body (4) and the static mold (14); and a positioning guide hole (17) opposite to the positioning guide pillars (6) is opened on the static mold (14).

5. The die-casting mold according to any one of claims 1 to 4, characterized in that: A cooling water channel is provided in the movable mold body (4); and a cooling water channel is also provided in the static mold (14).

6. The die-casting mold according to claim 5, characterized in that: An overflow groove (12) is provided on the side of the die-casting cavity (13).

7. The die-casting mold according to claim 6, characterized in that: A demoulding push rod (10) is also provided in the overflow groove (12) and can freely pass through.

8. The die-casting mold according to claim 6, characterized in that: A guide cone (11) facing the injection nozzle (15) is arranged in the die-casting cavity (13) of the movable die body (4).

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