Vacuum valve of integrated die-casting die

Abstract

A vacuum valve of an integrated die-casting die comprises the die-casting die, a vacuum valve body, an oil cylinder and an exhaust pipe, the vacuum valve body and the oil cylinder are installed in a vacuum valve installation cavity and an oil cylinder installation cavity which are formed in the die-casting die respectively, a valve element arranged in an inner cavity of the vacuum valve body is connected with the oil cylinder, and the inner cavity of the vacuum valve body extends out of the die-casting die through the exhaust pipe. An inner cavity of the vacuum valve comprises a guide section, an air exhaust section and a sealing section, a sealing sleeve is arranged in the guide section, a mounting hole is formed in one side of the air exhaust section, an air exhaust pipe is mounted in the mounting hole and communicated with the air exhaust section, the sealing section is a stepped hole, the diameter of a small-diameter section is the same as that of the air exhaust section, and a middle-diameter section is a straight surface section. The small-diameter section is communicated with the cavity and used for forming straight face sealing with the straight face of the valve element end, the large-diameter section is communicated with the cavity, a first inclined face is arranged between the small-diameter section and the medium-diameter section and used for forming inclined face sealing with the inclined face of the valve element end, and a guide inclined face is arranged between the medium-diameter section and the large-diameter section.

Description

Technical Field

[0001] This utility model relates to the field of vacuum valves, specifically to a vacuum valve for an integrated die-casting mold. Background Technology

[0002] The existing integrated die-casting mold has a relatively large cavity, with a volume of about 3.3L to 3.5L and a vacuuming volume of 13-15L. The vacuuming volume is relatively large, requiring multiple hydraulic vacuum valves to ensure that the vacuum level is below 100mbar, or even below 50mbar.

[0003] However, existing vacuum valves only have a beveled surface at the front end of the inner cavity that mates with the beveled surface of the valve core to form a seal. The disadvantage of this structure is that if there are unremoved aluminum shavings or oil residue between the beveled surface of the vacuum valve's inner cavity and the beveled surface of the valve core, the beveled surface seal can easily fail, allowing molten aluminum to enter the vacuum valve and cause blockage. Furthermore, after prolonged use, plastic deformation along the length of the valve core can also easily cause a poor seal, allowing molten aluminum to enter the vacuum valve and cause blockage. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a vacuum valve for an integrated die-casting mold. It achieves a high level of sealing by having a first inclined surface and a first straight surface in the inner cavity of the vacuum valve respectively cooperate with the inclined surface and straight surface of the valve core to form a seal, thereby preventing the vacuum valve from becoming clogged.

[0005] The technical solution of this utility model is as follows: a vacuum valve for an integrated die-casting mold, comprising a die-casting mold, a vacuum valve, a hydraulic cylinder, and a suction pipe. The vacuum valve and the hydraulic cylinder are respectively installed in a vacuum valve mounting cavity and a hydraulic cylinder mounting cavity provided inside the die-casting mold. A valve core provided in the inner cavity of the vacuum valve is connected to the hydraulic cylinder. The inner cavity of the vacuum valve extends to the outside of the die-casting mold through the suction pipe. The inner cavity of the vacuum valve includes a guide section, a suction section, and a sealing section. A sealing sleeve is provided in the guide section. An installation hole is provided on one side of the suction section. A suction pipe is installed in the installation hole and communicates with the suction section. The sealing section is a stepped hole, wherein the diameter of the small diameter section is the same as the diameter of the suction section, the medium diameter section is a straight section for forming a straight-face seal with the straight face of the valve core end, and the large diameter section communicates with the cavity. A first inclined surface is provided between the small diameter section and the medium diameter section for forming an inclined surface seal with the inclined face of the valve core end. A guide inclined surface is provided between the medium diameter section and the large diameter section.

[0006] Preferably, the inclination angle of the first inclined plane is 45° to 65°.

[0007] Preferably, the gap between the intermediate diameter section and the straight surface of the valve core end is less than 0.05 mm.

[0008] Preferably, the height of the large-diameter section is greater than the height of the valve core end.

[0009] Preferably, the large-diameter section has a trumpet-shaped opening.

[0010] Preferably, a vacuum valve body pressure plate is fixed to the outside of the vacuum valve mounting cavity by bolts, and the vacuum valve body pressure plate is used to fix the vacuum valve in the vacuum valve mounting cavity.

[0011] The advantages of this utility model are:

[0012] 1. The vacuum valve and valve core of this utility model adopt double sealing, namely oblique sealing and straight sealing. Double sealing can increase the effectiveness of sealing and avoid poor sealing.

[0013] 2. When the vacuum valve core retracts, if the concentricity of the vacuum valve and the valve core exceeds the tolerance, i.e., the straight-face seal is not tight, the inclined-face seal can compensate and correct the deviation, ensuring the overall sealing effect of the vacuum valve.

[0014] 3. When the valve core of the vacuum valve of this utility model is retracted, if there are aluminum shavings and oil stains remaining on the side of the valve core, they can be scraped off by the first straight surface of the vacuum valve to ensure the overall sealing effect of the vacuum valve.

[0015] Glossary

[0016] Integrated die casting: Integrated die casting is an innovative manufacturing process that integrates multiple complex parts from a car's body-in-white into a single component using die casting. First proposed by Tesla in 2019, it was applied to the production of the Model Y's rear floor panel in 2020. This technology uses a large die casting machine to inject molten metal into a mold to form the final part, thus achieving the one-time molding of multiple components. This not only simplifies the manufacturing process but also improves production efficiency, bringing new possibilities for lightweighting in the automotive industry. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view of the integrated die-casting mold of this utility model;

[0018] Figure 2 This is an assembly drawing of the vacuum valve, valve core, oil cylinder, and suction pipe of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of point A;

[0020] Figure 4 This is a cross-sectional view of the valve core of this utility model;

[0021] Figure 5 This is a cross-sectional view of the vacuum valve of this utility model;

[0022] Figure 6 for Figure 5 Enlarged view of point B. Detailed Implementation

[0023] See Figures 1 to 6 A vacuum valve for an integrated die-casting mold includes a die-casting mold 1, a vacuum valve 2, a hydraulic cylinder 3, and a suction pipe 4. The vacuum valve 2 and the hydraulic cylinder 3 are respectively installed in a vacuum valve mounting cavity and a hydraulic cylinder mounting cavity 5 inside the die-casting mold 1. A valve core 6 is provided in the inner cavity of the vacuum valve 2 and connected to the hydraulic cylinder 3. The inner cavity of the vacuum valve 2 extends to the outside of the die-casting mold 1 through the suction pipe 4. The inner cavity of the vacuum valve 2 includes a guide section 20, a suction section 21, and a sealing section 23. A sealing sleeve 20 is provided in the guide section 20. 1. A mounting hole 22 is provided on one side of the suction section 21. A suction pipe 4 is installed in the mounting hole 22 and communicates with the suction section 21. The sealing section 23 is a stepped hole, wherein the small diameter section has the same diameter as the suction section 21, the medium diameter section 232 is a straight section, used to form a straight seal with the straight surface of the valve core end 61, and the large diameter section communicates with the cavity. The large diameter section has a trumpet-shaped opening. The purpose of this design is that when the valve core 6 is pushed out for suction, the trumpet-shaped opening can leave a larger suction gap and increase the suction speed. A first inclined surface 231 is provided between the small diameter section and the medium diameter section 232, used to form an inclined seal with the inclined surface of the valve core end 61. The inclination angle of the first inclined surface 231 is 45° to 65°. The purpose of this design is that even if aluminum shavings and oil stains enter the inclined surface of the valve core end 61 or the first inclined surface 231, they can easily gather to the straight section and be scraped away. A guide slope 233 is provided between the intermediate diameter section 232 and the large diameter section to guide the straight surface of the valve core end 61, preventing direct collision and damage. The gap between the intermediate diameter section 232 and the straight surface of the valve core end 61 is less than 0.05mm to ensure the sealing performance of the straight surface. The height of the large diameter section is greater than the height of the valve core end 61 to prevent collision with the cavity when the valve core end 61 is pushed out to evacuate the cavity, thus avoiding damage to the valve core end 61 or the cavity. A vacuum valve body pressure plate 7 is bolted to the outside of the vacuum valve mounting cavity to fix the vacuum valve 2 inside. This design eliminates the need to disassemble the entire die-casting mold to replace the vacuum valve 2 compared to existing technologies. When the vacuum valve 2 malfunctions, it can be quickly replaced simply by removing the vacuum valve body pressure plate 7, greatly improving the efficiency of vacuum valve 2 replacement.

[0024] In use, the valve core 6 is pushed out to the large-diameter section, at which point the vacuum valve 2 is open. The vacuum valve 2 then pumps or blows air into the mold cavity through the suction pipe 4. The main purpose of pumping is to remove air from the mold cavity and maintain a high vacuum state; the main purpose of blowing is to blow out aluminum chips or oil stains brought into the vacuum valve 2 during pumping to prevent valve blockage. Then, the valve core 6 is returned to its original position, where the valve core end 61 forms a double seal with the first inclined surface 231 and the middle diameter section 232 of the sealing section, with both inclined and straight surfaces. At this point, the vacuum valve is closed, the mold begins die casting, and the molten aluminum begins to fill.

[0025] 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 vacuum valve for an integrated die-casting mold, comprising a die-casting mold (1), a vacuum valve (2), a hydraulic cylinder (3), and a suction pipe (4), wherein the vacuum valve (2) and the hydraulic cylinder (3) are respectively installed in a vacuum valve mounting cavity and a hydraulic cylinder mounting cavity (5) provided inside the die-casting mold (1), a valve core (6) provided in the inner cavity of the vacuum valve (2) is connected to the hydraulic cylinder (3), and the inner cavity of the vacuum valve (2) extends to the outside of the die-casting mold (1) through the suction pipe (4), characterized in that: The inner cavity of the vacuum valve (2) includes a guide section (20), an air extraction section (21), and a sealing section (23). A sealing sleeve (201) is provided in the guide section (20). An installation hole (22) is provided on one side of the air extraction section (21). An air extraction pipe (4) is installed in the installation hole (22) and communicates with the air extraction section (21). The sealing section (23) is a stepped hole, wherein the diameter of the small diameter section is the same as the diameter of the air extraction section (21), the medium diameter section (232) is a straight section, which is used to form a straight seal with the straight surface of the valve core end (61), and the large diameter section communicates with the cavity. A first inclined surface (231) is provided between the small diameter section and the medium diameter section (232), which is used to form an inclined surface seal with the inclined surface of the valve core end (61). A guide inclined surface (233) is provided between the medium diameter section (232) and the large diameter section.

2. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The inclination angle of the first inclined plane (231) is 45° to 65°.

3. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The gap between the middle diameter section (232) and the straight surface of the valve core end (61) is less than 0.05 mm.

4. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The height of the large-diameter section is greater than the height of the valve core end (61).

5. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The large-diameter section has a funnel-shaped opening.

6. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: A vacuum valve body pressure plate (7) is fixed to the outside of the vacuum valve mounting cavity by bolts. The vacuum valve body pressure plate (7) is used to fix the vacuum valve (2) in the vacuum valve mounting cavity.

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