초록 ▼

A method of producing a casting by using a 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 ma

A method of producing a casting by using a 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 ▼

[ What is claimed is:] [1.] A method comprising the following steps in the sequence set forth:forming a fabrication mold using a non-sand core formed of a non-sand material; andsupplying a molten metal into said fabrication mold to fabricate a metallic article;wherein said non-sand material consists

[ What is claimed is:] [1.] A method comprising the following steps in the sequence set forth:forming a fabrication mold using a non-sand core formed of a non-sand material; andsupplying a molten metal into said fabrication mold to fabricate a metallic article;wherein said non-sand material consists essentially of plastic and wherein said plastic is one selected from the group consisting of a thermoplastic resin and a thermosetting resin; andwherein said non-sand material has properties which provide said non-sand core with a compression resistance sufficient to withstand a pressure during supply of said molten metal into said fabrication mold, and which provide said non-sand core with a disintegration characteristic so that said non-sand core is disintegrated for removal from said fabrication mold after the fabrication of said metallic article.