Mold apparatus for forming article under influence of magnetic f

Details Mold apparatus for forming article under influence of magnetic f Mold apparatus for forming article under influence of magnetic f

1983-02-28

1984-04-10

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

249134, 264 24, 264108, 425568, B29C 1022

Patent

active

044418752

ABSTRACT:
A mold apparatus for forming ring-shaped magnet from a plastic magnet material containing a magnetic powder under the influence of a magnetic field, comprising a stationary intermediate composite retainer plate and a movable intermediate composite retainer plate, the former being put on the latter, said movable intermediate composite retainer plate consisting of at least one cylindrical or inversed frusto-conical cavity block made of a magnetic material having a ring-shaped cavity, at least one cavity block holder made of non-magnetic material embracing and holding the cavity block and at least one cylindrical or inversed frusto-conical magnetism shielding member made of a non-magnetic material and disposed concentrically and in contact with the lower side of the cavity, said stationary intermediate composite retainer plate consisting of at least one cylindrical or inversed frusto-conical sprue block made of a magnetic material, and at least one sprue block holder made of a non-magnetic material embracing and holding the sprue block. The diameter of the side of said magnetism shielding member contacting the lower side of the cavity is greater than the outside diameter of the cavity. The sprue block is placed on the cavity concentrically with the cavity and the diameter of the side of the sprue block contacting the upper side of the cavity is not larger than the inside diameter of the cavity.

REFERENCES:
patent: 3881853 (1975-05-01), Loubier

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