Die casting method for filtering cavity

A die casting method for a filtering cavity comprising:

• transferring an aluminum alloy liquid to a stirrer including:
• an electromagnetic inductor;
• and
• a stirring rod arranged across an inside of the stirrer;
• covering the stirrer and evacuating air inside the stirrer;
• starting the stirrer to stir the aluminum alloy liquid under an airtight vacuum condition, the aluminum alloy liquid being simultaneously subjected to:
• an electromagnetic stirring in a direction of a magnetic field generated by the electromagnetic inductor;
• and
• a mechanical stirring under a rotation action of the stirring rod;
• continuing stirring the aluminum alloy liquid for 20-80 minutes until the aluminum alloy liquid becomes semisolid to obtain a semisolid aluminum alloy slurry, a temperature of the semisolid aluminum alloy slurry being 550-650° C.;
• and
• injecting the semisolid aluminum alloy slurry into a filter die to perform die casting molding at an injection speed of 1.5-2.5 m/s, an injection specific pressure of 30-80 MPa, a pressurization pressure of 60-80 MPa, and a temperature of the filter die of 250-400° C., and maintaining pressure for 7-30 seconds to obtain the filtering cavity.