Chain and method for blanking hole in chain plate
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United States of America Patent
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N/A
Issued Date -
Mar 15, 2007
app pub date -
Sep 13, 2006
filing date -
Sep 15, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In blanking holes in plates that comprise a chain, in order to improve the fatigue strength of the chain, a press-punched plate prepared hole, trumpet-shaped, is shaved and made into a straight hole, both ends of the straight hole are chamfered, and further, a multi-step burnishing punch composed of a plurality of annular convex portions at predetermined intervals is pressed into the straight hole, improving the dimensional accuracy of the hole and the smoothness of the hole wall and producing compressive residual stress in the hole wall.
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