Core rod forging for precise internal geometry
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United States of America Patent
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Apr 9, 2013
Grant Date -
Nov 11, 2010
app pub date -
Oct 17, 2008
filing date -
Oct 17, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A forging die tool set defines a cavity and includes a core rod in the cavity for shaping a void in a work piece. The core rod extends in a direction in which the work piece is introduced, compressed, and ejected from the cavity. The core rod includes an upper portion and a lower portion. The upper portion has a cross sectional shape that forms a certain shape in the work piece and a radially tapered section that tapers toward the lower portion of the core rod. The lower portion also has a cross sectional shape that forms a certain shape in the work piece, and the cross sectional shape of the upper portion differs from the cross sectional shape of the lower portion, the lower portion being a more wear resistant shape characterized by larger radii and the upper portion being a finishing shape with smaller radii for shaping the final form of the forged work piece.
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