Patent ID: 6374899
Filing Date: 2002-04-23
Classification: B22C,B22D,G02B

Abstract:
A method for the production of a cast article having a small hole, comprising the steps ofsetting a linear core member of a desired cross-sectional shape in a cavity of a metal mold, injecting a molten metal into the cavity of said metal mold to produce a cast product, and drawing out said linear core member from the cast product to form a small hole having the cross-sectional shape of the linear core member, wherein a linear core member having a surface film formed by surface coating or by subjecting to a surface treatment is used as said linear core member, and the linear core member is drawn out from the cast product after the casting, thereby forming in the cast product a small hole of the cross-sectional shape substantially equal to that of the linear core member, wherein a tension load is applied to said linear core member set in said mold in the drawing direction and in this state the molten metal is injected into said cavity of the mold, wherein said cast material is an alloy containing an amorphous phase in a volumetric ratio of at least 50%.