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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.


Figure:152
Compressive Forces On Round Part Cause Crack Propagation In Center 
Of Work



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.

Figure:153
Roll Piercing Or Mannesmann Process















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