Evaporative pattern casting process
AssigneeAshland Oil, Inc.
InventorRobert L. Snook
Life of this patent
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Abstract
An improved expendable pattern casting process and an improved refractory composition for coating expendable patterns used in the process containing substantially spherical refractory material.
Claims14
In the process for the preparation of metallic castings by the evaporative pattern casting process wherein an expendable pattern is coated with refractory material prior to the pouring of molten metal to form a casting of the desired shape an improvement comprising coating the expendable pattern with refractory material comprising a sufficient amount of substantially spherical refractory material to support the pattern during the pouring of the metal and to vent the gases formed by the evaporation of the pattern so as to obtain a casting of the desired shape and surface.
A process of the preparation of a casting by the evaporative pattern casting procedure which comprises forming a pattern of the desired article from vaporizable material, coating the pattern with a refractory material comprising, at least, 10 percent by volume of substantially spherical refractory material to allow venting of vapors of the vaporizable material, placing the coated pattern in unbonded sand and pouring molten metal into the coated pattern causing the vaporization of the pattern and the formation of the desired casting.
Dependencies are inferred from the claim text.