Magnetic plastic rotor disk manufacturing apparatus

A magnetic plastic rotor disk manufacturing apparatus for manufacturing diametrically magnetized magnetic plastic rotor disks comprising;

• a metal mold comprising a pair of half molds for molding a magnetic plastic material containing synthetic resin matrix and magnetic powder into a plurality of disks, and having a plurality of cavities along the parting surface thereof;
• two magnetic field creating coils for creating and applying the magnetic fields along said parting surface of said metal mold to magnetize and orient the magnetic particles of said magnetic powder injected into said plurality of cavities;
• a first yoke provided in the central portion of said metal mold so as to extend on one side thereof perpendicularly to said parting surface;
• and
• a second yoke provided in the metal mold so as to extend along said parting surface;
• and
• a third yoke provided in the central portion of said metal mold so as to extend on the other side thereof perpendicularly to said parting surface;
• said plurality of cavities being formed on a circle concentrically formed with said second yoke;
• so that the respective magnetic fluxes of said magnetic fields created by said two magnetic field creating coils are concentrated in the central portion of said second yoke by way of said first and third yokes, respectively, and are guided radially by said second yoke from the central portion toward the periphery thereof.

A magnetic plastic rotor disk manufacturing apparatus for manufacturing diametrically magnetized magnetic plastic rotor disks, comprising;

• a metal mold comprising a pair of half molds for molding a magnetic plastic material containing synthetic resin matrix and magnetic powder into a plurality of disks, and having a plurality of cavities along the parting surface thereof;
• two magnetic field creating coils for creating and applying the magnetic fields along said parting surface of said metal mold to magnetize and orient the magnetic particles of said magnetic powder injected into said plurality of cavities;
• a first yoke provided in the central portion of said metal mold so as to extend on one side thereof perpendicularly to said parting surface;
• a second yoke provided in the metal mold so as to extend along said parting surface;
• and
• a fourth yoke provided in the peripheral portion of said metal mold so as to extend on the other side thereof perpendicularly to said splitting surface;
• said plurality of cavities being formed in said second yoke in an area inwardly of said fourth yoke on a circle concentrically formed with said second yoke;
• so that the respective magnetic fluxes of said magnetic fields created by said two magnetic field creating coils are guided by said first, second and fourth yokes and so that said magnetic fluxes are concentrated in the central portion of said second yoke and flow radially from the central portion toward the periphery thereof.