Punch
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 3, 2013
Grant Date -
Feb 18, 2010
app pub date -
Oct 23, 2009
filing date -
Mar 29, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A punch for use in molding a workpiece with lubricating oil interposed between the punch and the workpiece includes a straight portion and a diameter-increasing portion. The straight portion includes an end face and a side face. The straight portion extends in an axial direction. The end surface extends in a radial direction perpendicular to the axial direction. The side surface is connected to the end surface. The diameter-increasing portion is connected to the straight portion. The diameter-increasing portion includes a width in the radial direction, which is identical to that of the straight portion, at a junction between the straight portion and the diameter-increasing portion. The width of the diameter-increasing portion in the radial direction increases with distance from the straight portion. At least one of the end surface and the side surface of the straight portion is formed with a pit.
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