Pressure casting method of filter cavity

Abstract

The invention discloses a pressure casting method of a filter cavity. The method comprises the steps that (1), aluminum alloy liquid is transferred into a stirrer internally provided with an electromagnetic inductor and a stirring rod, and the stirring rod penetrates into the stirrer; (2), the stirrer is covered and air inside the stirrer is pumped out; (3), the stirrer is started to stir the aluminum alloy liquid in a closed vacuum condition, so that the aluminum alloy liquid is subjected to electromagnetic stirring in the magnetic field direction of the electromagnetic inductor, mechanical stirring is conducted under the rotation function of the stirring rod, and the aluminum alloy liquid is stirred to be in a semi-solid state to obtain a semi-solid aluminum alloy sizing agent; and (4),the semi-solid aluminum alloy sizing agent obtained in the step (3) is injected into a filter mold, pressure casting molding is conducted with the injection speed of 1.5-2.5 meters / second, the injection specific pressure of 30-80 MPa and the boost pressure of 60-80 MPa, the filter cavity is obtained after pressure is kept for 7-30 seconds, and the temperature of the filter mold is set to be 250-400 DEG C.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to an alloy die-casting method. Background technique [0002] With the improvement of the integration level of signal electrical devices in 4G / 5G wireless communication base stations, the size of cavity filter die-casting parts increases accordingly, the equipment becomes heavier and heavier, and the heat dissipation requirements become higher and higher. Operators at home and abroad have put forward clear requirements for wireless base stations with high thermal conductivity, light weight, and low cost. Aluminum alloy die-casting parts are the key structural materials of wireless base stations, which provide a basis for fixing electronic components and circuit boards inside the base station, and at the same time export the working heat of electrical components through the heat sink, and are the main components for cooling down the signal transmission box of the base station; To impr...

AI Technical Summary

Problems solved by technology

[0003] Die casting is a liquid molding method. Due to the fast injection speed, the liquid is easy to form turbulent flow in the cavity, and the air in the cavity is involved in the product; when the liquid hits the mold, the temperature difference is large, and the liquid on the surface solidifies quickly , which increases the flow resistance of the core liquid, so it cannot be well fused to form a cold barrier. At the same time, the alloy introduces oxides or some other impurities during the melting and casting process, which eventually leads to a decrease in product performance

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