Die-casting die with internal exhaust structure

Abstract

The utility model discloses a die-casting die with an internal exhaust structure. The die-casting die comprises an upper die, an upper die holder, a lower die and a lower die holder, wherein at least one through hole is formed in the lower die; the through hole is positioned in a gas wrapping area in a cavity after the upper mold and the lower mold are closed and molten metal is injected; a venting plug is arranged in the through hole, the upper surface of the venting plug is a cavity surface, and the venting plug is of a capillary hole structure; the lower surface of the venting plug communicates with the perforated inner cavity; a plurality of communicating holes communicating with the lower surface of the lower die holder are formed in the lower die holder, and the communicating holes communicate with all the penetrating holes in a one-to-one or one-to-many mode; a groove is formed in the lower surface of the lower die holder; the communicating hole is communicated with the groove; a sealing plate is arranged on the lower surface of the lower die holder and is used for sealing the groove; the die-casting die with the inner exhaust structure further comprises a gas control unit which communicates with the communicating cavity and controls the communicating cavity to be in a negative pressure state or a positive pressure state. In the product forming process, air wrapping can be reduced as much as possible, and the product quality is improved and guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of plane inspection tools, in particular to a die-casting mold with an internal exhaust structure. Background Art

[0002] Die castings are made by injecting molten metal into the die casting mold and then cooling it to form a die casting product. Before the metal liquid is injected into the mold, it is necessary to reduce the amount of air in the mold cavity so that there are as few bubbles as possible in the die casting product to ensure product quality. At present, the exhaust plate and vacuum are generally used to discharge the air in the mold cavity.

[0003] However, no matter what method is used, it is impossible to completely exhaust the air in the mold cavity to achieve a vacuum state, so when the molten metal is injected into the mold cavity, the problem of air entrapment is inevitable. The appearance of air entrapment will have a relatively large impact on the quality of the product being molded. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a die-casting mold with an internal exhaust structure, which can reduce the occurrence of entrapped air as much as possible during the product molding process, thereby improving and ensuring product quality.

[0005] The purpose of the utility model is achieved through such technical solution:

[0006] A die-casting mold with an internal exhaust structure comprises an upper mold, an upper mold base, a lower mold and a lower mold base, wherein the lower mold is provided with at least one through hole; the through hole is located in the gas-enclosed area inside the mold cavity after the metal liquid is injected after the upper mold and the lower mold are closed;

[0007] An exhaust plug is provided in the perforation, the upper surface of the exhaust plug is the cavity surface, and the exhaust plug is a capillary structure; the lower surface of the exhaust plug is connected to the inner cavity of the perforation;

[0008] The lower die base is provided with a plurality of communicating holes connected with the lower surface of the lower die base, and the plurality of communicating holes are connected with all the through holes in a one-to-one or one-to-many manner; the lower surface of the lower die base is provided with a groove; the communicating holes are connected with the groove; the lower surface of the lower die base is provided with a sealing plate, and the sealing plate seals the groove;

[0009] The die-casting mold with an internal exhaust structure also includes a gas control unit, which is connected to the connecting cavity and controls the connecting cavity to be in a negative pressure state or a positive pressure state.

[0010] Furthermore, the perforation is stepped, with the larger opening end facing the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the perforation, with the upper surface matching the cavity surface and the lower surface abutting against the stepped surface of the perforation.

[0011] Furthermore, the perforation is stepped, with the smaller opening facing the cavity of the upper die; the exhaust plug has a T-shaped cross section, is arranged in the perforation, has a lower end flush with the lower surface of the lower die, and an upper surface matches the cavity surface; the stepped surface of the exhaust plug abuts against the stepped surface of the perforation;

[0012] The connecting hole arranged on the lower die base opposite to the through hole is coaxial with the through hole, and the diameter of the connecting hole is smaller than the diameter of the exhaust plug.

[0013] Further, the perforation comprises:

[0014] A main hole is arranged in the lower die, and the lower end thereof passes through the lower die, and the lower end of the main hole is connected with the connecting hole;

[0015] At least two branch holes, the upper ends of which pass through the cavity surface of the lower mold and the lower ends are connected to the main hole; the upper ends of the branch holes are stepped holes, and the larger opening ends face the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the branch hole, and the upper surface matches the cavity surface; the cross-sectional area of ​​the main hole is not less than the sum of the cross-sectional areas of all the branch holes connected thereto.

[0016] Furthermore, the main hole is perpendicular to the mating surface of the lower mold; the branch hole includes a vertical hole and an inclined hole connected in sequence; the upper end of the vertical hole is a stepped hole, and the larger opening end faces the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the branch hole, the upper end of the inclined hole is connected to the vertical hole, and the lower end is connected to the upper end of the main hole.

[0017] Furthermore, the cross-sectional area of ​​the smaller hole region of the stepped hole on the branch hole is not less than one third of the cross-sectional area of ​​the larger hole region.

[0018] Furthermore, the lower die is provided with an insert hole; an insert is arranged in the insert hole; and the through hole is arranged in the insert;

[0019] The lower end surface of the insert is flush with the surface of the lower mold; the upper surface of the exhaust plug is parallel to the die surface of the lower mold.

[0020] Furthermore, the insert and the exhaust plug are both manufactured by 3D printing.

[0021] Furthermore, the minimum distance between the edge of the vent plug of the insert and the edge of the insert is not less than 5 mm; the area of ​​the vent plug on the insert does not exceed one half of the surface of the insert.

[0022] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0023] By setting exhaust plugs at the parts where air is easily trapped during the product molding process, the exhaust plugs have capillaries on the surface achieved through 3D printing, which can discharge gas and prevent aluminum liquid from entering, effectively discharging gas from the parts of the product that are prone to air entrapment. At the same time, a blowing system is set up to blow air from the inside to the outside during mold spraying to reduce the risk of capillary pore blockage.

[0024] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings of the present utility model are as follows:

[0026] Figure 1 Schematic diagram of the first three-dimensional structure of the die-casting mold with an internal exhaust structure in the embodiment.

[0027] Figure 2 Schematic diagram of the second three-dimensional structure of the die-casting mold with an internal exhaust structure in the embodiment.

[0028] Figure 3 Schematic diagram of the top view of the die-casting mold with an internal exhaust structure in the embodiment.

[0029] Figure 4 for Figure 3 Enlarged structural diagram at A in the middle.

[0030] Figure 5 for Figure 4 Schematic diagram of the structure of the middle BB section.

[0031] Figure 6 for Figure 4 Schematic diagram of the structure at the CC section.

[0032] Figure 7 for Figure 4 Enlarged structural diagram at D in the middle.

[0033] Figure 8 for Figure 7 A schematic diagram of the first three-dimensional structure of the insert, exhaust plug and perforation in the middle.

[0034] Fig. 9 for Figure 7 Schematic diagram of the second three-dimensional structure of the insert, exhaust plug and perforation in the middle.

[0035] Fig.10 for Figure 7 Schematic diagram of the first three-dimensional structure of the exhaust plug and the perforation in the middle.

[0036] Fig.11 for Figure 7 Schematic diagram of the second three-dimensional structure of the exhaust plug and perforation in the middle.

[0037] In the figure: 1. lower die; 2. lower die base; 3. insert; 4. perforation; 5. exhaust plug; 6. connecting hole; 7. groove; 8. main hole; 91. vertical hole; 92. inclined hole. DETAILED DESCRIPTION

[0038] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0039] Example:

[0040] like Figures 1 to 11 As shown, a die-casting mold with an internal exhaust structure comprises an upper mold, an upper mold base, a lower mold 1 and a lower mold base 2, wherein the lower mold 1 is provided with at least one through hole 4; the through hole 4 is located in the gas-enclosed area inside the mold cavity after the upper mold and the lower mold 1 are closed and the metal liquid is injected;

[0041] The through hole 4 is provided with an exhaust plug 5, the upper surface of the exhaust plug 5 is the cavity surface, and the exhaust plug 5 is a capillary structure; the lower surface of the exhaust plug 5 is connected with the inner cavity of the through hole 4;

[0042] The lower die base 2 is provided with a plurality of communicating holes 6 connected with the lower surface of the lower die base 2, and the plurality of communicating holes 6 are connected with all the through holes 4 in a one-to-one or one-to-many manner; the lower surface of the lower die base 2 is provided with a groove 7; the communicating holes 6 are connected with the groove 7; the lower surface of the lower die base 2 is provided with a sealing plate (not shown in the figure, which is integrated with other structures of the mold), and the sealing plate seals the groove 7;

[0043] The die-casting mold with an internal exhaust structure also includes a gas control unit, which is connected to the communication cavity and controls the communication cavity to be in a negative pressure or positive pressure state. The gas control unit uses an air pump that can evacuate and inflate air or other devices that control the flow of gas.

[0044] like Figure 4 , Figure 6 As shown, in this embodiment, the through hole 4 is stepped, and the larger opening end faces the cavity of the upper mold; the exhaust plug 5 is arranged in the larger opening of the through hole 4, the upper surface matches the cavity surface, and the lower surface abuts against the stepped surface of the through hole 4.

[0045] The exhaust plug 5 can be better installed and fixed by using the stepped hole.

[0046] like Figure 4 , Figure 5As shown, in this embodiment, the through hole 4 is stepped, and the smaller opening end faces the cavity of the upper mold; the exhaust plug 5 has a T-shaped cross section and is arranged in the through hole 4, with the lower end flush with the lower surface of the lower mold 1 and the upper surface matching the cavity surface; the stepped surface of the exhaust plug 5 abuts against the stepped surface of the through hole 4;

[0047] The connecting hole 6 arranged on the lower die base 2 at a position opposite to the through hole 4 is coaxial with the through hole 4 , and the diameter of the connecting hole 6 is smaller than the diameter of the exhaust plug 5 .

[0048] For areas with a large amount of entrained gas, the exhaust plug 5 with a large interface and a through-structure can quickly exhaust the gas while ensuring the structural strength of the area.

[0049] like Fig.10 , Fig.11 It is shown that the perforation 4 comprises:

[0050] A main hole 8 is provided in the lower die 1, and the lower end thereof penetrates the lower die 1, and the lower end of the main hole 8 is connected with the connecting hole 6;

[0051] At least two branch holes, the upper ends of which pass through the cavity surface of the lower mold 1 and the lower ends are connected to the main hole 8; the upper ends of the branch holes are stepped holes, and the larger opening ends face the cavity of the upper mold; the exhaust plug 5 is arranged in the larger opening of the branch hole, and the upper surface matches the cavity surface; the cross-sectional area of ​​the main hole 8 is not less than the sum of the cross-sectional areas of all the branch holes connected thereto.

[0052] In this embodiment, the main hole 8 is perpendicular to the mating surface of the lower mold 1; the branch hole includes a vertical hole 91 and an inclined hole 92 which are connected in sequence; the vertical hole 91 is a stepped hole at the upper end, and the larger opening end faces the cavity of the upper mold; the exhaust plug 5 is arranged in the larger opening of the branch hole, and the upper end of the inclined hole 92 is connected to the vertical hole 91, and the lower end is connected to the upper end of the main hole 8.

[0053] In this embodiment, the cross-sectional area of ​​the smaller hole region of the stepped hole on the branch hole is not less than one third of the cross-sectional area of ​​the larger hole region. Such a design can better ensure the smoothness of gas flow.

[0054] like Figure 4 , 5 As shown in , 7, 8, and 9, in this embodiment, the lower mold 1 is provided with an insert 3 hole; the insert 3 is arranged in the insert 3 hole; the through hole 4 is arranged in the insert 3;

[0055] The lower end surface of the insert 3 is flush with the surface of the lower mold 1 ; the upper surface of the exhaust plug 5 is parallel to the mating surface of the lower mold 1 .

[0056] In this embodiment, the insert 3 and the exhaust plug 5 are both manufactured by 3D printing.

[0057] In this embodiment, the minimum distance between the edge of the vent plug 5 of the insert 3 and the edge of the insert 3 is not less than 5 mm; the area of ​​the vent plug 5 on the insert 3 does not exceed one half of the surface of the insert 3.

[0058] The overall structural strength of the insert 3 can be ensured.

[0059] The die-casting mold with an internal exhaust structure in this embodiment is used as follows: the insert 3 and the exhaust plug 5 are made by 3D printing. The capillary diameter of the exhaust plug 5 is controlled to be impermeable to aluminum liquid but gas can pass through. The exhaust plug 5 is connected to the insert 3, and then the insert 3 is connected to the lower mold 1. After the exhaust plug 5 and the insert 3 are installed, individual areas such as Figure 4 , 6 The exhaust plug 5 can be directly installed on the lower mold 1 in the area shown.

[0060] When the mold is in use, the gas control unit controls the injection of air into the groove 7 so that the air pressure in the groove 7 is greater than the external atmospheric pressure, the exhaust plug 5 exhausts outward, and then the release agent is sprayed on the lower mold 1, so as to prevent the demoulding machine from clogging the capillaries on the exhaust plug 5.

[0061] Then the upper mold and the lower mold 1 are closed, the cavity is vacuumed, and the groove 7 is controlled to be in a completely sealed state. Finally, aluminum liquid is injected into the cavity, and the aluminum liquid flows in the cavity. The gas remaining in the cavity forms air inclusions in a specific area (affected by factors such as the glue inlet and slag outlet designed by the mold) along with the flow of aluminum liquid. The air inclusions enter the connecting hole 6 through the exhaust plug 5 and finally enter the groove 7. At the same time, the groove 7 can be continuously vacuumed under the action of the gas control unit. In this way, the air inclusions in the cavity are discharged from the cavity as much as possible.

[0062] Finally, it should be noted that the above 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 with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A die-casting mold with an internal exhaust structure, comprising an upper mold, an upper mold base, a lower mold and a lower mold base, characterized in that: The lower mold is provided with at least one through hole; the through hole is located in the gas-enclosed area inside the mold cavity after the metal liquid is injected after the upper mold and the lower mold are closed; An exhaust plug is provided in the perforation, the upper surface of the exhaust plug is the cavity surface, and the exhaust plug is a capillary structure; the lower surface of the exhaust plug is connected to the inner cavity of the perforation; The lower die base is provided with a plurality of communicating holes connected with the lower surface of the lower die base, and the plurality of communicating holes are connected with all the through holes in a one-to-one or one-to-many manner; the lower surface of the lower die base is provided with a groove; the communicating holes are connected with the groove; the lower surface of the lower die base is provided with a sealing plate, and the sealing plate seals the groove; The die-casting mold with an internal exhaust structure also includes a gas control unit, which is connected to the connecting cavity and controls the connecting cavity to be in a negative pressure state or a positive pressure state.

2. The die-casting mold with an internal exhaust structure according to claim 1, characterized in that: The perforation is stepped, with the larger opening facing the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the perforation, with the upper surface matching the cavity surface and the lower surface abutting against the stepped surface of the perforation.

3. The die-casting mold with an internal exhaust structure according to claim 1, characterized in that: The perforation is stepped, with the smaller opening facing the cavity of the upper die; the exhaust plug has a T-shaped cross section and is disposed in the perforation, with the lower end flush with the lower surface of the lower die and the upper surface matching the cavity surface; the stepped surface of the exhaust plug abuts against the stepped surface of the perforation; The connecting hole arranged on the lower die base opposite to the through hole is coaxial with the through hole, and the diameter of the connecting hole is smaller than the diameter of the exhaust plug.

4. The die-casting mold with an internal exhaust structure according to claim 1, characterized in that: The perforation comprises: A main hole is arranged in the lower die, and the lower end thereof passes through the lower die, and the lower end of the main hole is connected with the connecting hole; At least two branch holes, the upper ends of which pass through the cavity surface of the lower mold and the lower ends are connected to the main hole; the upper ends of the branch holes are stepped holes, and the larger opening ends face the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the branch hole, and the upper surface matches the cavity surface; the cross-sectional area of ​​the main hole is not less than the sum of the cross-sectional areas of all the branch holes connected thereto.

5. The die-casting mold with an internal exhaust structure according to claim 4, characterized in that: The main hole is perpendicular to the mating surface of the lower mold; the branch hole includes a vertical hole and an inclined hole connected in sequence; the upper end of the vertical hole is a stepped hole, and the larger opening end faces the cavity of the upper mold; the exhaust plug is arranged in the larger opening of the branch hole, the upper end of the inclined hole is connected to the vertical hole, and the lower end is connected to the upper end of the main hole.

6. The die-casting mold with an internal exhaust structure according to claim 4, characterized in that: The cross-sectional area of ​​the smaller hole region of the stepped hole on the branch hole is not less than one third of the cross-sectional area of ​​the larger hole region.

7. The die-casting mold with an internal exhaust structure according to any one of claims 3 to 6, characterized in that: The lower die is provided with an insert hole; an insert is arranged in the insert hole; and the through hole is arranged in the insert; The lower end surface of the insert is flush with the surface of the lower mold; the upper surface of the exhaust plug is parallel to the die surface of the lower mold.

8. The die-casting mold with an internal exhaust structure according to claim 7, characterized in that: The insert and the exhaust plug are both manufactured by 3D printing.

9. The die-casting mold with an internal exhaust structure according to claim 8, characterized in that: The minimum distance between the edge of the vent plug of the insert and the edge of the insert is not less than 5 mm; the area of ​​the vent plug on the insert does not exceed one half of the surface of the insert.

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