초록 ▼

A casting is produced using a non-sand plastic core. The plastic core is made of a thermoplastic resin and set in a casting mold so as to form a cavity in the casting mold. A molten metal such as aluminum is poured under pressure into the cavity to form the casting (product). The plastic core mainta

A casting is produced using a non-sand plastic core. The plastic core is made of a thermoplastic resin and set in a casting mold so as to form a cavity in the casting mold. A molten metal such as aluminum is poured under pressure into the cavity to form the casting (product). The plastic core maintains its initial shape during casting. The remaining heat of the casting or the solidifying metal causes the plastic core to melt after the casting so that the molten plastic core is easily removed.

대표청구항 ▼

A core assembly in a fabrication mold for fabrication of an article from a flowable material which is flowable at a high temperature, the article having at least one of a hollow section and an undercut section, said core assembly comprising a core formed of a non-sand material and configured to defi

A core assembly in a fabrication mold for fabrication of an article from a flowable material which is flowable at a high temperature, the article having at least one of a hollow section and an undercut section, said core assembly comprising a core formed of a non-sand material and configured to define at least part of the at least one of the hollow section and the undercut section of the article, means defining a fluid flow passage formed in said core, and a continuously flowing fluid contained in said fluid flow passage for cooling said core during fabrication of the article, wherein said non-sand material is fibrous material and said fibrous material is selected from the group consisting of paper, synthetic paper, non-woven fabric, and fibers.