Abstract: A two-piece core assembly comprising part of the tooling used in an injection molding machine has a core body and a core tip that is secured to one end of the body. Preferably, the tip and body are constructed from two different metallic materials. To assemble the parts, a socket at the end of the core body may be induction heated to expand the recess of the socket sufficiently to permit the normally larger base end of the tip to be inserted into the recess, followed by cooling the socket to room temperature to cause the socket to shrink and tightly grip the tip against dislodgement.

Abstract: Quick change blow mold tooling includes a pair of mold cavity blocks that cooperate to define a series of blow cavities. The tooling further includes a pushup plate having a series of bottom contours that plug the otherwise open bottoms of the cavities when the pushup plate is against the bottom of the mold blocks. Each mold block is quickly attached to and detached from its supporting back plate using studs that fit into receiving holes on the back plate and cam locking shafts that are accessible from opposite side edges of the back plates. The back plates thus remain secured to platens of the bottle forming machine during change out of the tooling. Similarly, the push up plate has a pair of locking studs projecting from the underside thereof that are received within socket members attached to the machine. The socket members are provided with quick release threaded couplers that can be locked and unlocked by hand.