Patent ID: 8413479
Filing Date: 2013-04-09
Classification: B21J,B21K

Abstract:
1. In a forging die tool set for metal components having a die defining a cavity, a core rod in the cavity for shaping a void in a work piece, the core rod extending in a direction in which the work piece is introduced, compressed, and ejected from the cavity, the improvement wherein: the core rod has an upper portion and a lower portion, the upper portion having a cross sectional shape that forms a certain shape in the work piece and a tapered section that tapers toward the lower portion, the lower portion having a cross sectional shape that forms a certain shape in the work piece, and the cross sectional shape of the upper portion differs from and is more refined than the cross sectional shape of the lower portion wherein both the lower portion cross sectional shape and the upper portion cross sectional shape are spline shapes.