Manufacturing method for defect-free casting product

Details Manufacturing method for defect-free casting product Manufacturing method for defect-free casting product

1990-03-02

1991-11-26

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164319, 164320, B22D 2711

Patent

active

050675508

ABSTRACT:
A manufacturing method for a defect-free cast product comprises the steps of forming a cavity surrounded by a plurality of dies, charging molten conductive material into the cavity, and applying pressure to the conductive material by pressure means. In the method, additional pressure is selectively applied to the portion of the conductive material which may suffer shrinkage cavities due to delay in solidification, by utilizing the pressure applied by the pressure means and by relatively moving a portion of the dies with respect to the conductive material when the conductive material solidifies and shrinks, whereby shrinkage cavities are prevented. Accordingly, with a cast rotor core obtained by this method, it is possible to prevent shrinkage cavities from occurring in the conductive material and it is also possible to improve the efficiency and torque characteristics of the motor, thereby achieving reductions in the size and weight of the motor.

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