US 4,397,080 AGranted

Process for preparation of support tooling for extrusion dies

AssigneeMe-U-Sea, Inc.

InventorJay H. Muusse

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Abstract

A process for preparation of support tooling for extruding dies is described in which a substantial reduction in machining is experienced by utilizing a pattern destroying precision casting system in which the pattern is adjusted to shrinkage and provided with a die orifice opening staged up in size to suit the particular support role of the tooling as in a backer or bolster. This is significant because such support elements are regarded as one-of-a-kind structures. Finish machining and treatment requires minimal time and at substantial energy reduction. The pattern is prepared from a destructible or vaporizable plastic material replaced by the molten metal conforming to the mold configuration.

Claims3

Dependent claims

A process for preparation of support tooling for extrusion dies including the steps of:

(1) sizing a foamed plastic pattern to include a central opening therethrough;
(2) placing said plastic pattern in a flask and burying said pattern in sand with a sprue form connected to said pattern;
(3) casting metal into said pattern cavity surrounded by said sand and vaporizing said foamed plastic and forming said metal to a cylindrical form in said sand;
(4) parallelizing two spaced-apart faces of said cylindrical form by light machining of both faces;
(5) trueing said form for concentricity about the cylinder axis;
(6) hardening said form as desired;
(7) mounting said cylindrical support form in support engagement for an extrusion die on the downstream side thereof, wherein said sizing is achieved by a hot wire to provide a cylindrical pattern including a uniformly configured central opening therethrough having the same configuration as the central opening of said extrusion die but of increased outer dimensions, said pattern having two spaced-apart parallel end faces.

4 more elements

Dependencies are inferred from the claim text.