Method and apparatus for plastically forming helical internal gears and helical gears
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United States of America Patent
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-
May 15, 1990
Grant Date -
N/A
app pub date -
Dec 20, 1988
filing date -
Dec 26, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is to extrude helical internal gears and helical gears by pushing materials processed to any type of blank into a die unit successively by use of a punch, i.e., by passing the materials once through the die unit. The invention is directed to a die unit comprising an outer contour restraining container into which metal material blanks each having a central bore are to be inserted, a die placed contiguously below the container, these container and die being arranged to be circumferentially rotatable relative to each other, and upper and lower mandrels disposed inside the container and the die in alignment with their axes, respectively, and interconnected for being circumferentially rotatable relative to each other, the metal materials being successively pushed into gaps between the upper mandrel and the container and between the lower mandrel and the die by means of a punch to mold helical internal gears.
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