Stepped core pin for a casting mold
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United States of America Patent
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-
Aug 11, 1992
Grant Date -
N/A
app pub date -
Jun 20, 1990
filing date -
Mar 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The stepped core pin has a shank to be fitted in a pin holding bore formed in a wall of a casting mold and a forming portion having a diameter smaller than that of the shank which is projected from the inner surface of the casting mold defining a mold cavity into the mold cavity. A front portion of the shank is reduced to form a neck portion and a molten metal stopping portion is formed between the neck portion and the forming portion. The diameter of the molten metal stopping portion, which is slightly smaller than that of the shank excluding the neck portion, is determined so that a clearance through which the molten metal is unable to leak into the pin holding bore is formed between the outer circumference of the pin holding bore and the inner circumference of the molten metal stopping portion. This clearance effectively combines the length of the forming portion with the length of the neck, thereby reducing stress and fatigue to the projected forming portion.
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