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A method for casting metals around an article having a bore extending along a central axis and defined at least in part by an interior cylindrical wall portion utilizes a mandrel having a cylindrical exterior surface portion sized to be slidingly positioned in said bore in close relationship with sa

A method for casting metals around an article having a bore extending along a central axis and defined at least in part by an interior cylindrical wall portion utilizes a mandrel having a cylindrical exterior surface portion sized to be slidingly positioned in said bore in close relationship with said interior cylindrical wall portion. The mandrel has an annular groove in which is positioned a canted coil spring with a series of outer contact points extending radially outwardly beyond said cylindrical exterior surface portion. The article is moved onto the mandrel to compress the spring and deflect the outer contact points such that the spring imparts an outwardly directed force to the article interior cylindrical wall portion to provide frictional resistance between the spring, outer contact points and the interior cylindrical wall portion to retain the article on the mandrel while casting molten metal around the mandrel supported article to form a cast part.

대표청구항 ▼

A method for casting an engine block having at least one cylindrical bore formed therein, said bore having a separately formed liner retained therein, comprising the steps of: (a) providing (i) a mandrel extending along an axis from a first end to a second end, said mandrel including a wall having a

A method for casting an engine block having at least one cylindrical bore formed therein, said bore having a separately formed liner retained therein, comprising the steps of: (a) providing (i) a mandrel extending along an axis from a first end to a second end, said mandrel including a wall having a cylindrical exterior surface extending from said first end toward said second end, said wall having an outwardly facing annular groove positioned such that portions of said cylindrical exterior surface are located between said first end and said annular groove and between said second end and said annular groove, said annular groove extending inwardly from said cylindrical exterior surface toward said axis to a bottom, (ii) a canted coil spring positioned in said outwardly facing annular groove, said spring including a series of coils, each said coils having an inner contact point in contact with said bottom and an outer contact point extending radially outwardly beyond said cylindrical exterior surface, and (iii) a liner having a cylindrical interior surface sized to permit said liner to be slidingly positioned on said mandrel in close engagement with said cylindrical exterior surface; (b) moving said liner onto said mandrel first end in sliding engagement with said exterior surface, engaging said spring and continuing movement of said liner on said mandrel toward said second end to compress said spring and deflect said outer contact points inwardly toward said axis, said spring imparting an outwardly directed force around an annular portion of said liner interior surface providing frictional resistance between said spring, including said outer contact points, and said liner interior surface to retain said liner on said mandrel; (c) casting molten metal around said mandrel supported liner to form a cast part while retaining said liner On said mandrel; and (d) withdrawing said mandrel and said spring from said liner while leaving said liner retained in said cast part. A die casting apparatus for use in casting metal parts comprising: (a) a mandrel located within a mold cavity in said casing apparatus and extending along an axis from a first end to a second end, said mandrel including a wall having a cylindrical exterior surface extending from said first end toward said second end, said wall having an outwardly facing annular groove positioned such that portions of said cylindrical exterior surface are located between said first end and said annular groove and between said second end and said annular groove, said annular groove extending inwardly from said exterior surface toward said axis to a bottom, (b) a canted coil spring positioned in said outwardly facing annular groove, said spring being resiliently compressible and including a series of coils having inner contact points in contact with said bottom and a series of outer contact points which extend radially outwardly beyond said cylindrical exterior surface when said spring is not compressed; and (c) a liner having a cylindrical interior surface sized to permit said liner to be slidingly positioned on said mandrel in close engagement with said cylindrical exterior surface, said liner positioned on said mandrel in a position engaging and compressing said spring such that said outer contact points engage said liner interior surface, said spring imparting an outwardly directed force to said liner interior surface to provide frictional resistance between said spring including said outer contact points and said liner interior surface to retain said liner on said mandrel.