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Aluminum division silver anniversary.

H.B. Dieter's 1965 paper, Aluminum Castings from Expanded Polystyrene Patterns," was commemorated by the Aluminum Division at CASTEXPO' 90. His was a personal look back-interwoven with anecdote and first-hand experience-of the people and developments that left a lasting imprint on the expendable pattern process.

Dieter recalled his first contact with polystyrene pattern material in postwar Germany, 1946: "strange white stuff" found in a boxcar, from which he carved Christmas ornaments. Over a decade later, Harold F. Shroyer's 1958 U.S. Patenton "cavityless casting "was purchased by German interests.

Full Mold Process, Inc, Lathrop Village, MI was incorporated to license the use of the Shroyer patent, and later obtained the T.R. Smith patent for the production of castings from unbonded sand.

Dieter noted several reasons why aluminum foundries were slow to adopt the process: the licensee's lucrative profits from automotive stamping dies, and the relative efficiency of diecasting and permanent mold production.

Meanwhile, art casters were exploring the possibilities of the new process under poetic license." As Dieter mentioned, several prominent art casters were early proponents of the process in a period when foundries were still experimenting with foam cups.

A number of experiments with the process variables affecting foam vaporization-adequate ramming, and zircon wash coating-were conducted at MIT. As he noted in 1965, "much of this interesting work (at MIT and other institutions) has never been published."

Dieter's retrospective Silver Anniversary Lecture was a vivid description of those hallmark events during the advent of the "cavityless casting" process and of those-including such men as Dieter himself-who made it possible.
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Publication:Modern Casting
Date:Jun 1, 1990
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