Stock material or miscellaneous articles – All metal or with adjacent metals – Intermediate article
Patent
1987-01-27
1990-11-13
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Intermediate article
B21K 304
Patent
active
049701258
ABSTRACT:
An outer stabilizing band or bands at the unsupported end portion of the air foils changes the configuration from an unsupported cantilevered airfoil to a baband supported airfoil during the forming of the mold and casting of the product. Such band or bands, which are later shaved away, permit dimensional stabilization and provide an outer wall for venting, fill-out, and inclusion trapping. The stabilizing band or bands are extremely thin, normally in the range of 20 to 60 one thousandths of an inch, which avoids the need for gating and minimizes the amount of machining required to remove such stabilizing band or bands from the integral airfoil and hub casting. The bands may be outside the end of the airfoil or flush with the ends of the airfoil. The procedure and method for incorporating the outer band or bands into the casting begins with the process of making the pattern. It also aids in the stabilizing of the configuration of the pattern thereby achieving more dimensional accuracy. This is applicable whether soluble patterns, one piece wax patterns, or patterns made of assembled parts are involved.
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Chromalloy Castings Miami Corp.
Dominik Jack E.
Zimmerman John J.
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