Method for manufacturing a rocker arm
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Mar 20, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a method and apparatus for forming an outwardly extending tubular portion in a side wall of a workpiece, such as a rocker arm. The method includes the following steps: (1) positioning the workpiece in a punch press having a central shaft with a movable punch mounted in an aperture formed in the central shaft for lateral sliding movement with respect to the shaft; (b) extending the central shaft into the interior cavity of the workpiece; and (c) actuating lateral sliding movement of the movable punch against the side wall of the workpiece to cold form the outwardly extending tubular portion in the side wall.
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