Method and rolling die for producing a screw with a variable thread pitch
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United States of America Patent
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Apr 28, 2015
Grant Date -
Dec 6, 2012
app pub date -
Jul 13, 2012
filing date -
Jan 14, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed herein is a method for manufacturing a screw comprising a continuous thread with a variable thread pitch, in which method a blank is rolled between two rolling dies, wherein in each rolling die a rolling profile is formed that comprises a host of curved non-parallel depressions. The depressions are designed and arranged in such a manner that during rolling no volume transport, or as little volume transport as possible, in the axial direction takes place, or a volume transport from a region of the blank where a thread section with a larger thread pitch is to be formed, to a region in which a thread section with a smaller thread pitch is to be formed takes place.
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