Vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology

Abstract

The invention discloses a vacuum valve for aluminum alloy high-pressure die casting based on an additive manufacturing technology. The vacuum valve comprises a valve body, valve elements and elastic pieces. The whole valve body is of a cylindrical structure, and valve holes, a plurality of vacuum air channels A and a plurality of vacuum air channels B are formed in the valve body. Air inlets of the vacuum air channels A are located in the end face of the whole, the air inlets are of an axisymmetric double-frustum structure, and air inlet holes are formed in the joint of the double-frustum structure. The vacuum air channels B are located in the valve body, one ends of the vacuum air channels B communicate with the vacuum air channels A, and the other ends of the vacuum air channels B communicate with the valve holes and are of a variable-section fan-shaped structure. The elastic pieces sleeve the outer walls of the valve elements, and when the valve elements are extruded by external force, the valve elements slide into the valve holes to block the vacuum air channels B and the valve holes. When the valve elements are not extruded by external force, the elastic pieces jack the valve elements, so that the vacuum air channels B communicate with the valve holes. According to the vacuum valve for aluminum alloy high-pressure die casting based on the additive manufacturing technology, the air channels are closed through molten metal at the tail end, the failure rate of valve element blocking is greatly reduced, and the die-casting production stability and efficiency are greatly improved.

Description

technical field [0001] The invention relates to the field of die-casting technology, in particular to a vacuum valve for aluminum alloy high-pressure die-casting based on additive manufacturing technology. Background technique [0002] Vacuum metal die-casting technology has been widely used in new energy vehicles, 5G communications, improvement of traditional automotive castings, electronics, household, aviation and other fields. Vacuum die-casting technology is to extract the air in the cavity of the molten metal before cooling and forming. Reduce the injection specific pressure, reduce the porosity, increase the density of the product, and enhance the mechanical properties. Vacuum valve is a very important part in vacuum die casting process. [0003] In the prior art, most vacuum valves are closed by electrical control switches, but this kind of solenoid valve is expensive and has a high failure rate. When the vacuum valve is damaged or blocked, the replacement and clean...

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Problems solved by technology

[0003] In the prior art, most vacuum valves are closed by electrical control switches, but this kind of solenoid valve is expensive and has a high failure rate. When the vacuum valve is damaged or blocked, the replacement and cleaning time is also very long, thereby reducing production. In addition, the design of the vacuum pumping area of ​​the existing vacuum valve is also very limited, and the time in the die-casting process is very short. When the design of the cross-sectional area is limited, the vacuum pumping effect is seriously affected. Under the pressure state, through the limited cross-sectional area, the conductance is very small, the pressure damage is very large, and the ideal vacuum pressure in the production process cannot be reached.

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