High-vacuum pressure casting die hydraulic vacuum valve

Abstract

The invention belongs to the technical field of pressure casting, and relates to a high-vacuum pressure casting die hydraulic vacuum valve. The high-vacuum pressure casting die hydraulic vacuum valvecomprises a die and a hydraulic driver. The die comprises a movable die plate and a fixed die plate. After the movable die plate and the fixed die plate are spliced, a die cavity and a vacuum suctionport capable of communicating with the die cavity are reserved in the middle, and a vacuum valve seat capable of being switched off by a vacuum valve element is arranged between the vacuum suction port and the die cavity. The hydraulic driver comprises a hydraulic oil cylinder connected with an opening oil way and a closing oil way, the vacuum valve element telescopically moves in the hydraulic oil cylinder, the vacuum valve seat is provided with a through hole with the upper face communicating with the die cavity, the upper portion of the vacuum valve element penetrates through the through hole, and the vacuum suction port is located in the direction vertical to the through hole. According to the mechanism, the sensitive vacuum valve is adopted for controlling on and off of air suction ofthe pressure casting die, the ventilation area is large, the air suction efficiency is high, the concentricity is not affected, mounting is easy, and the sealing performance is reliable.

Description

technical field [0001] The invention relates to the technical field of die-casting, in particular to a hydraulic vacuum valve for a high-vacuum die-casting mold. 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] Existing vacuum valve mechanism such as figure 1 Shown: It is mainly composed of a mold movable mold valve body flow channel A1, a blocking spool A2, and a pressure spool A3. In the process of high-pressure die-casting, the thrust principle of molten metal is used. ...

AI Technical Summary

Problems solved by technology

However, the design of the vacuum valve and the cooperation between the mold are quite complicated. When the vacuum valve is damaged or blocked, the replacement and cleaning time is also very long, resulting in a waste of production components

The cost of the vacuum valve is also very expensive, which also increases the cost of production and use

[0006] ③ 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 vacuuming effect is seriously affected. The airflow passes through the limited cross-sectional area under negative pressure. , the flow 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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