초록 ▼

A mold comprising a mold core and mold cavity defines means which permits and controls a slight outward stretching of the mold cavity from a first positively centered position to a second positively centered position. By this means, precision centering of the mold and core can be achieved even under

A mold comprising a mold core and mold cavity defines means which permits and controls a slight outward stretching of the mold cavity from a first positively centered position to a second positively centered position. By this means, precision centering of the mold and core can be achieved even under ultra high molding pressures without significant core shift.

대표청구항 ▼

In a mold which comprises a mold core and a mold cavity movable between open and closed positions and together defining a molding chamber in the closed position, and sprue means for supplying plastic molding compound to the molding chamber in the closed position, said mold core and mold cavity defin

In a mold which comprises a mold core and a mold cavity movable between open and closed positions and together defining a molding chamber in the closed position, and sprue means for supplying plastic molding compound to the molding chamber in the closed position, said mold core and mold cavity defining a parting line between them in the closed position, and one of said mold core and mold cavity defining centering projection means at said parting line defining radially inner and outer surfaces, which projection means project into a recess means defined by the other of said mold core and mold cavity in the closed position to center said mold core and cavity, the improvement comprising, in combination: one of said radially inward and outward surfaces of the projection means engaging a mating, tapered face of the recess means upon moving into the closed position for further mold centering action, the other of the radially inner and outer surfaces of the projection means being spaced by a short distance from a mating face of the recess means on entering the closed position, whereby pressurization of said molding chamber during molding can expand said mold cavity to cause engagement of the spaced surface of the projection means and its mating face of the recess for mold centering during said pressurization.