# US 4,397,080 A · Process for preparation of support tooling for extrusion dies

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- Number: US 4,397,080 A
- Document ID: US4397080A
- Status: Granted
- Kind: A
- Application number: 06/205,731
- Filed: 1980-11-10
- Granted: 1983-08-09
- Earliest claimed: 1980-11-10
- Assignees: Me-U-Sea, Inc.
- Inventors: Jay H. Muusse
- Web page: https://patentgrep.com/patent/US4397080A

## CPC

- B23P 15/24: dies (B21C3/18, B21C25/10, B21D37/20 take precedence)
- B22C 9/046: {Use of patterns which are eliminated by the liquid metal in the mould}
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A process of claim 1 wherein said hot wire sizing includes forming external alignment slots in the exterior surface of said pattern.

### Claim 3 (depends on 2)

A process of claim 2 in which threaded inserts are placed in selected openings in the sidewall of said pattern to provide threaded openings in the sidewall of said support tooling.