Sand core pattern and method of forming a sand mold

Metal founding – Process – Shaping a forming surface

Patent

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Details

164248, B22C 700, B22C 902

Patent

active

042943035

ABSTRACT:
A sand core pattern (11) for producing a one-piece cast wheel (10) having a radially inner shell (12), a radially outer blade support (13), and a plurality of angled blades (14) extending in a spaced, annular array (22). The pattern includes a plurality of similar segments (15), each having an inner end portion (18) defining a portion of the profile of the shell, and an outer end portion (21) defining the profile of the blade. The segments are supported in annular array about a mandrel (25) and are circumscribed by a split ring (26) defining the pattern for the outer blade support portion of the wheel (10). The inner portions of the segments are defined by angled side surfaces (16,17) which, in alternate ones of the segments in the annular array, converge and diverge toward the center of the array. Upon completion of the forming of the sand mold about the pattern, the mandrel and outer ring are removed, permitting the segments having the inwardly diverging side faces to be withdrawn inwardly from the array and permit the remaining segments then to be withdrawn inwardly therefrom.

REFERENCES:
patent: 118693 (1871-09-01), Cornell
patent: 3247548 (1966-04-01), Fields et al.
patent: 4043385 (1977-08-01), Petrenchik
patent: 4231413 (1980-11-01), Bretzger

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