Insert for thread cutting
AssigneeSandvik AB
InventorStig E. V. Lagerberg
Life of this patent
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Abstract
A thread cutting insert comprises a block having along one edge thereof a plurality of teeth for successively cutting a thread in a workpiece. The teeth are of successively increasing heights from a first to a last of the teeth. The first tooth has a smoothly convexly curved cutting edge, and the remaining teeth have a multi-sided cutting edge defined by three sides of a trapezoid.
Claims10
A thread-cutting insert for cutting a thread in a tubular metal workpiece, comprising a block having along one edge thereof more than two cutting teeth arranged to successively cut a thread in a workpiece, said teeth being successively larger from a first to a last of said teeth, said first of said teeth having a smoothly convexly curved cutting edge for initially cutting a helical groove of smoothly concavely curved profile, and each of the remaining teeth having a multi-sided cutting edge for reshaping said helical groove.
A thread-cutting insert for cutting a thread in a tubular metal workpiece, comprising a block defined by parallel top and bottom surfaces and four edge surface extending therebetween, one of said edge surfaces including more than two cutting teeth extending entirely within a space defined between two planes containing said top and bottom surfaces, respectively, said teeth being of successively increasing heights from a first to a last of said teeth, another of said edge surfaces being situated opposite said one edge surface and defining an edge support surface, said teeth being spaced by successively increasing distances from said other edge, said first tooth having a smoothly convexly curved cutting edge for initially cutting a helical groove of smoothly concavely curved profile, each of the remaining teeth having a multi-sided cutting edge for reshaping said helical groove.
Dependencies are inferred from the claim text.