APPARATUS FOR PRODUCING CAST PIECES WITH UNDERCUTS IN INNER CAVITY Russian patent published in 2008 - IPC B22D17/24 

FIELD: foundry, namely casting parts of plastics, casting with use of investment patterns, pressure die casting, casting to chill molds.

SUBSTANCE: apparatus includes inclined pin mounted in stationary mold half; slide placed in T-shaped grooves of movable mold half; wedge and cores defining undercuts of cast piece. Wedge defines part of inner cavity of cast piece and it is arranged inside inner opening of slide with possibility of lengthwise motion. Cores are placed in inner opening of slide with possibility of motion in direction normal relative to slide axis by means of guiding screws and elastic members. In upper position slide is fixed by means of spring-loaded stop. When press mold is closed, position of slide with wedge is fixed by means of locking members secured to stationary mold half. In opened press mold inclined pin pulls out wedge and inclined surface of wedge shifts from inclined surfaces of cores, elastic members press out cores from slide surface and displace them from undercuts of cast piece. Due to action of inclined pin wedge is going on its motion downwards till stops. Then slide begins to move for pressing out spring-loaded stop and shifting cores from cast piece.

EFFECT: lowered labor consumption for making press-mold.

5 dwg