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Rotary Tube Piercing
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Rotary tube piercing, also called roll piercing, or the mannesmann process,
is a hot forming process that can manufacture long lengths of seamless tube
and pipe. Compressive forces applied to a cylinder will create internal stresses
at the center. These stresses result in crack propagation.
Rotary tube piercing manufacture relies on this physical principle. A round
stock is center drilled at its end and compressive forces are applied by the use of
two rolls. A mandrel is used to shape and size the internal cavity formed at the
center of the round stock. The rolls rotate in the same direction and are oriented
at an axis that is at a slightly skewed angle to the axis of the part. This causes the
stock to be pulled through the rolls and forces it against the mandrel.