Process for the production of a hollow workpiece being profiled at least internally in a straight or helical manner relative to the workpiece axis
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United States of America Patent
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Oct 18, 1994
Grant Date -
N/A
app pub date -
Jul 2, 1993
filing date -
Jul 16, 1992
priority date (Note) -
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Abstract
The well known Grob method, as practiced on a Grob machine, uses at least a partially profiled mandrel wherein during a cold forming operation, via a forming or impact roller of a workpiece blank, produces a hollow workpiece that is profiled at least internally wherein the material is shaped radially as well as axially in a single operation and the axial and radial shaping of the workpiece blank is achieved at least internally as a whole or in part in a straight or helical manner relative to the workpiece axis, by means of this forming roller and achieves the economical production of high quality workpieces in a single operation, with outer profiling also being achievable, and the difference (D) between the outer radius (RO) of the workpiece blank and the outer radius (RD) of the mandrel preferably being the same as or smaller than the length (WL) of the finished workpiece.
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