Double-injection die-casting vacuum system

Abstract

The utility model provides a double injection die-casting vacuum system which comprises a vacuum pump, a die and a main negative pressure device, the main negative pressure device is communicated with a cavity of the die through a first pipeline, the first pipeline is provided with a first valve assembly used for controlling opening and closing of the pipeline, the die is provided with a sprue runner communicated with the cavity, and the sprue runner is provided with a second valve assembly used for controlling opening and closing of the first valve assembly. The double-injection die-casting vacuum system further comprises an auxiliary negative pressure device, the auxiliary negative pressure device is communicated with the sprue runner through a second pipeline, and the second pipeline is provided with a second valve assembly used for controlling opening and closing of the second pipeline. And the vacuum pump is respectively communicated with the main negative pressure device and the auxiliary negative pressure device so as to absorb airflow in the main negative pressure device and the auxiliary negative pressure device. The utility model solves the problem of poor casting quality caused by the fact that the cavity is filled with molten metal at a high speed and gas in the cavity and a sprue area cannot be timely exhausted in a double-injection die-casting process.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum die casting, in particular to a double-shot die casting vacuum system. Background Art

[0002] In the field of die-casting production, especially in the manufacturing process of high-precision and complex structural parts, product quality is affected by many factors, among which the gas in the mold cavity (including water vapor, smoke and other residual gases) is one of the main causes of die-casting defects. Although the traditional single-stage negative pressure system can reduce the gas inside the cavity to a certain extent, when facing the injection of molten metal of specific materials, especially those that are sensitive to gas or require rapid cooling to maintain the integrity of the fine structure, a single negative pressure control is often not enough to completely eliminate all bad gases, thus affecting the surface finish, internal density and mechanical properties of the casting.

[0003] Especially in the double-shot die-casting process, as the molten metal fills the cavity at high speed, the removal of gas in the cavity and gate area becomes a major challenge. Inadequately removed gas can easily form defects such as pores and cold shuts inside the casting, which can lead to product scrapping and increase production costs, limiting the development and application of die-casting technology in high-precision and cutting-edge fields.

[0004] In view of the above problems, the existing die-casting vacuum system urgently needs a more efficient and accurate gas control solution to meet the growing demand for high-quality die-casting products. In particular, how to effectively manage and reduce the gas interference in the key path of the gate runner has become a key breakthrough in improving the yield and quality of die-casting parts. Utility Model Content

[0005] The utility model aims to provide a double-shot die-casting vacuum system to solve the problem of poor casting quality caused by the failure to remove gas in the cavity and gate runner area in time due to the high-speed filling of the cavity by molten metal in the double-shot die-casting process.

[0006] In order to achieve the above-mentioned purpose of the utility model, one embodiment of the utility model provides a double-shot die-casting vacuum system, including a vacuum pump, a mold, and a main negative pressure device. The main negative pressure device is connected to the mold cavity through a first pipeline, and a first valve assembly for controlling the opening and closing of the pipeline is arranged on the first pipeline. The mold has a gate flow channel connected to the cavity. The double-shot die-casting vacuum system also includes an auxiliary negative pressure device, which is connected to the gate flow channel through a second pipeline, and a second valve assembly for controlling the opening and closing of the pipeline is arranged on the second pipeline. The vacuum pump is respectively connected to the main negative pressure device and the auxiliary negative pressure device to absorb the airflow between the two.

[0007] As a further improvement of one embodiment of the utility model, the auxiliary negative pressure device includes a first extrusion vacuum unit and a second extrusion vacuum unit, the first extrusion vacuum unit is connected to the gate runner through a second pipeline, the second extrusion vacuum unit is connected to the first extrusion vacuum unit through a branch pipeline, and the vacuum pump is respectively connected to the first extrusion vacuum unit and the second extrusion vacuum unit.

[0008] As a further improvement of an embodiment of the utility model, the mold includes a fixed mold and a movable mold, the fixed mold and the movable mold are connected to each other to form the cavity therebetween, and the first pipeline is arranged between the main negative pressure device and the fixed mold and between the main negative pressure device and the movable mold to connect the main negative pressure device and the cavity.

[0009] As a further improvement of an embodiment of the utility model, the mold includes a first template, a second template and a guide structure, the fixed mold is arranged on the first template, the movable mold is arranged on the second template, the guide structure is arranged between the first template and the second template, and the second template can be driven to move toward or away from the first template through the guide structure.

[0010] As a further improvement of an embodiment of the utility model, the first valve assembly includes a plurality of first hydraulic valves, and the plurality of first hydraulic valves are arranged on the first pipeline between the main negative pressure device and the movable mold.

[0011] As a further improvement of an embodiment of the utility model, the first valve assembly further includes a plurality of second hydraulic valves, and the plurality of second hydraulic valves are arranged on the first pipeline between the main negative pressure device and the fixed mold.

[0012] As a further improvement of an embodiment of the utility model, the second valve assembly includes a plurality of valve bodies, and the valve body is configured as any one of an exhaust plate valve body, a mechanical valve body and a hydraulic valve body.

[0013] As a further improvement of an embodiment of the utility model, the valve body is configured as an exhaust plate valve body.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The auxiliary negative pressure device has a large suction rate and a predetermined suction volume. Therefore, when the molten metal just flows into the runner mouth, the auxiliary negative pressure device can quickly perform suction to absorb the gas in the gate runner and the cavity, thereby improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic diagram of the structure of a double-shot die-casting vacuum system provided in one embodiment of the utility model;

[0017] Figure 2 for Figure 1 Framework diagram of the double-shot die casting vacuum system.

[0018] The above description of the drawings includes the following reference numerals:

[0019] 1. Vacuum pump;

[0020] 2. Mold; 21. Cavity; 22. Gate runner; 23. Fixed mold; 24. Moving mold; 25. First mold plate; 26. Second mold plate; 27. Guide structure;

[0021] 3. Main negative pressure device;

[0022] 4. The first pipeline;

[0023] 51. First hydraulic valve; 52. Second hydraulic valve; 53. Hydraulic pipeline; 54. Hydraulic control unit;

[0024] 6. Auxiliary negative pressure device; 61. First pressure injection vacuum unit; 62. Second pressure injection vacuum unit

[0025] 7. Second pipeline; 71. Branch pipeline;

[0026] 8. Valve body. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0030] In order to solve the problem in the prior art that in the double-shot die-casting process, the gas in the cavity and the gate flow channel area cannot be removed in time due to the high-speed filling of the cavity by the molten metal, resulting in poor casting quality, the utility model provides a new double-shot die-casting vacuum system.

[0031] like Figure 1-2 As shown, a double-shot die-casting vacuum system provided by an embodiment of the utility model includes a vacuum pump 1, a mold 2, and a main negative pressure device 3. The main negative pressure device 3 is connected to the cavity 21 of the mold through a first pipeline 4, and the first pipeline 4 is provided with a first valve assembly for controlling the opening and closing of the pipeline, wherein the mold 2 has a gate runner 22 connected to the cavity 21, and the double-shot die-casting vacuum system also includes an auxiliary negative pressure device 6, the auxiliary negative pressure device 6 is connected to the gate runner 22 through a second pipeline 7, and the second pipeline 7 is provided with a second valve assembly for controlling the opening and closing of the pipeline, and the vacuum pump 1 is respectively connected to the main negative pressure device 3 and the auxiliary negative pressure device 6 to absorb the airflow therein.

[0032] In this embodiment, the auxiliary negative pressure device 6 has a large suction rate and a predetermined suction volume. Therefore, when the molten metal just flows into the runner mouth, the auxiliary negative pressure device can quickly perform suction to absorb the gas in the gate runner and the cavity, thereby improving the quality of the product.

[0033] It can be understood that when the molten metal flows to a position on the gate runner 22 close to the inlet where the second pipeline 7 is connected to the gate runner 22, the second valve assembly controls the second pipeline 7 to close to prevent the molten metal from flowing out of the second pipeline 7.

[0034] Further, refer to Figure 2 As shown, the auxiliary negative pressure device 6 includes a first injection vacuum unit 61 and a second injection vacuum unit 62. The first injection vacuum unit 61 is connected to the gate runner 22 through a second pipeline 7, and the second injection vacuum unit 62 is connected to the first injection vacuum unit 61 through a branch pipeline 71. The vacuum pump 1 is respectively connected to the first injection vacuum unit 61 and the second injection vacuum unit 62.

[0035] In this way, the branch pipe 71 connects the first pressure-injection vacuum unit 61 and the second pressure-injection vacuum unit 62, and the internal cavity of the first pressure-injection vacuum unit 61 and the internal cavity of the second pressure-injection vacuum unit 62 can be pressure-equivalently balanced, thereby balancing the vacuuming capacities of the first pressure-injection vacuum unit 61 and the second pressure-injection vacuum unit 62 to ensure the vacuuming effect.

[0036] Understandably, reference Figure 1 As best shown, the mold 2 includes a fixed mold 23 and a movable mold 24, and the fixed mold 23 and the movable mold 24 are connected to each other to form the cavity 21 therebetween, and the first pipeline 4 is arranged between the main negative pressure device 3 and the fixed mold 23 and between the main negative pressure device 3 and the movable mold 24 to connect the main negative pressure device 3 and the cavity 21.

[0037] With such arrangement, the main negative pressure device 3 can extract gas from the fixed mold 23 and the movable mold 24 respectively through the first pipeline 4, thereby achieving a faster exhaust rate.

[0038] Furthermore, the mold 2 includes a first template 25, a second template 26 and a guide structure 27, the fixed mold 23 is arranged on the first template 25, the movable mold 24 is arranged on the second template 26, the guide structure 27 is arranged between the first template 25 and the second template 26, and the second template 26 can be driven to move toward or away from the first template 25 through the guide structure 27.

[0039] With such arrangement, the second mold plate 26 moves relative to the first mold plate 25 , thereby realizing the opening and closing of the fixed mold 23 and the movable mold 24 , and further opening and closing the mold 2 .

[0040] Steering Figure 1 As shown, the guide structure 27 includes a guide column arranged on one of the first template 25 and the second template 26, and a guide groove arranged on the other one (not shown in the figure, but should be understandable to those skilled in the art). The guide column cooperates with the guide groove. When the second template 26 is driven to move toward or away from the first template 25, the guide column slides in the guide groove, thereby playing a guiding role to prevent the second template 26 from shifting during the movement, resulting in misalignment between the fixed mold 23 and the movable mold 24, affecting the shape of the cavity 21.

[0041] Further, refer to Figure 2 As shown, the first valve assembly includes a plurality of first hydraulic valves 51, and the plurality of first hydraulic valves 51 are arranged on the first pipeline 4 between the main negative pressure device 3 and the movable mold 24. The first hydraulic valve 51 can be used to control the opening and closing of the first pipeline 4, so that the main negative pressure device 3 can vacuum the cavity through the movable mold 24 or stop vacuuming.

[0042] The hydraulic valve can control the pressure, flow and direction of the hydraulic system very accurately to ensure that the action of the actuator meets the predetermined requirements. For example, the pressure control valve can ensure the stability of the system pressure, the flow control valve can adjust the flow rate, and the direction control valve controls the on-off and flow direction of the fluid. In this embodiment, the first hydraulic valve 51 can adjust the air extraction rate of the first pipeline 4.

[0043] Furthermore, the first valve assembly generally includes a hydraulic pipeline 53 and a hydraulic control unit 54 that cooperate with the first hydraulic valve 51 ; the hydraulic control unit 54 is connected to the first hydraulic valve 51 through the hydraulic pipeline 53 , thereby controlling the opening and closing of the first hydraulic valve 51 .

[0044] Furthermore, the first valve assembly further includes a plurality of second hydraulic valves 52, which are arranged on the first pipeline 4 between the main negative pressure device 3 and the fixed mold 23. The second hydraulic valve 52 is used to open and close the first pipeline 4. Similarly, the second hydraulic valve 52 cooperates with the hydraulic control unit 54 and the hydraulic pipeline 53, and its assembly method is similar to the cooperation between the first hydraulic valve 51, the hydraulic control unit 54 and the hydraulic pipeline 53, which will not be repeated here.

[0045] Furthermore, the second valve assembly includes a plurality of valve bodies 8, and the valve body 8 is configured to be any one of an exhaust plate valve body, a mechanical valve body and a hydraulic valve body.

[0046] Specifically, when it is set as an exhaust plate valve body, when the molten metal reaches the valve body, the valve body will close naturally and will not be affected by external factors (such as aluminum liquid speed, hydraulics, pneumatics, etc.); when it is set as a mechanical valve body, during pressure injection, the valve body will be closed when the impact of the molten metal reaches a certain speed. Therefore, the mechanical valve body is controlled by the metal hydraulic injection speed; when it is set as a hydraulic valve body, the hydraulic valve cylinder will open and close during pressure injection, and the valve body is controlled by the hydraulic system.

[0047] Preferably, as an optimal embodiment, the valve body in this embodiment can be set as an exhaust plate valve body, so that the valve body switch is controlled by relying on the molten metal liquid. When the molten metal liquid is injected into the gate runner 22, the metal liquid can quickly close the exhaust plate valve body, thereby preventing the metal liquid from leaking through the second pipeline 7.

[0048] In summary, the embodiments of the present invention achieve the following technical effects:

[0049] The auxiliary negative pressure device 6 has a large suction rate and a predetermined suction volume. Therefore, when the molten metal just flows into the runner mouth, the auxiliary negative pressure device 6 can quickly perform suction to absorb the gas in the gate runner and the cavity, thereby improving the quality of the product.

[0050] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-shot die casting vacuum system, comprising a vacuum pump, a mold, and a main negative pressure device, wherein the main negative pressure device is connected to the mold cavity of the mold through a first pipeline, and a first valve assembly for controlling the opening and closing of the pipeline is provided on the first pipeline, characterized in that: The mold has a gate runner connected to the cavity, and the double-shot die-casting vacuum system also includes an auxiliary negative pressure device, which is connected to the gate runner through a second pipeline. A second valve assembly for controlling the opening and closing of the pipeline is provided on the second pipeline, and the vacuum pump is respectively connected to the main negative pressure device and the auxiliary negative pressure device to absorb the airflow between the two.

2. The double-shot die casting vacuum system according to claim 1, characterized in that: The auxiliary negative pressure device includes a first extrusion vacuum unit and a second extrusion vacuum unit. The first extrusion vacuum unit is connected to the gate runner through a second pipeline, and the second extrusion vacuum unit is connected to the first extrusion vacuum unit through a branch pipeline. The vacuum pump is respectively connected to the first extrusion vacuum unit and the second extrusion vacuum unit.

3. The double-shot die casting vacuum system according to claim 1, characterized in that: The mold includes a fixed mold and a movable mold, the fixed mold and the movable mold are connected to each other to form the cavity therebetween, and the first pipeline is arranged between the main negative pressure device and the fixed mold and between the main negative pressure device and the movable mold to connect the main negative pressure device and the cavity.

4. The double-shot die-casting vacuum system according to claim 3, characterized in that: The mold includes a first template, a second template and a guide structure. The fixed mold is arranged on the first template, the movable mold is arranged on the second template, the guide structure is arranged between the first template and the second template, and the second template can be driven to move toward or away from the first template through the guide structure.

5. The double-shot die-casting vacuum system according to claim 3, characterized in that: The first valve assembly includes a plurality of first hydraulic valves, and the plurality of first hydraulic valves are arranged on the first pipeline between the main negative pressure device and the movable mold.

6. The double-shot die casting vacuum system according to claim 3, characterized in that: The first valve assembly further includes a plurality of second hydraulic valves, and the plurality of second hydraulic valves are arranged on the first pipeline between the main negative pressure device and the fixed mold.

7. The double-shot die casting vacuum system according to claim 1, characterized in that: The second valve assembly includes a plurality of valve bodies, and the valve body is configured as any one of an exhaust plate valve body, a mechanical valve body and a hydraulic valve body.

8. The double-shot die casting vacuum system according to claim 7, characterized in that: The valve body is configured as an exhaust plate valve body.

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