Patent ID: 11858035
Assignee: HANJOOMETAL CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A method of providing electromagnetic vibration stirring in a semi-solid high pressure casting equipment, comprising:
generating a magnetic field by using an electromagnetic vibration stirring device comprising a ring-shaped casing comprising an inner wall into which a sleeve is inserted and an outer wall spaced apart from the inner wall, and a magnetic field generating unit located between the inner wall and the outer wall of the casing, and comprising a plurality of electromagnets radially arranged at equal intervals around the sleeve in a circumferential direction of the sleeve, each of the electromagnets comprising a core and a coil surrounding the core, and
applying, by using the magnetic field generating unit, a current for equal to or more than 0.5 seconds to each pair of opposed electromagnets or each pair of non-adjacent electromagnets sequentially in a clockwise or counterclockwise direction so that a portion of a semi-solid molten metal is sequentially vibrated in a vertical direction by the magnetic field along the circumferential direction of the sleeve, thereby controlling a microstructure of the molten metal by an intermittent vibrational flow in the vertical direction,
wherein the magnetic field generating unit generates the current of 80 to 120 A, or the magnetic field of 500 to 1000 Gauss in a center region of the sleeve, and
wherein a time period for applying the current to the entire electromagnets per one cycle is less than 20 seconds.