Evaporative pattern assembly and method of making

Abstract

An apparatus is disclosed for an evaporative pattern assembly for metal castings and associated cast metal feeding, the assembly comprising: (a) a central upright sprue; (b) a plurality of sprue branches integral with and extending radially away from said central sprue at each of at least two axial locations of the central sprue; (c) at least two gating rails, each integrally connected with the extremities of at least two sprue branches extending from different axial locations of the central sprue, each rail being connected to different and independent sprue branches so as to be supported in circumferentially-spaced positions relative to each other about said sprue; and (d) at least one pattern body integrally connected across two of said gating rails. Preferably, the body is complex in configuration having a plurality of projections connected to said rails by gates. The radially extending sprue branches are advantageously layered in different planes with the angular spacing between branches being in the range of 45.degree.-90.degree.. Also disclosed is a method of making and a method of using such evaporative pattern assembly.