Apparatus for forming metallic article by cold extrusion
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United States of America Patent
Stats
-
Mar 31, 1987
Grant Date -
N/A
app pub date -
Sep 11, 1984
filing date -
Sep 13, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for cold working a metallic blank having a central hole into a substantially annular or cylindrical article such as an internally and or externally toothed gear, with the method including forcibly inserting a hollow metallic blank at a normal temperature into a die cavity formed between a mandrel placed on a fixed base and a die concentrically surrounding the mandrel so that the blank is plastically deformed between the mandrel and the die; forcibly inserting a subsequent hollow metallic blank into the die cavity while the relative position between the mandrel, the die and the first blank being plastically deformed therebetween is kept unchanged; and urging the subsequent blank against the first blank to extrude the first blank forwardly out of the die whereby the first-said blank is formed into a tubular article.
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