Direct or indirect metal pipe extrusion process, mandrel for extruding metal pipes, metal pipe extruder and extruded metal pipe
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United States of America Patent
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Feb 2, 2021
Grant Date -
Oct 19, 2017
app pub date -
Jun 30, 2017
filing date -
Jul 27, 2012
priority date (Note) -
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Abstract
If a mandrel for extruding metal pipes, having two axially offset pressing surfaces with different radial characteristics and having a transition region between these two pressing surfaces has a support surface in the transition region then the negative effect of narrowing, which arises owing to the mandrel shifting from a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the die, can be minimized.
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