Method and apparatus for manufacturing seamless tubes

Details Method and apparatus for manufacturing seamless tubes Method and apparatus for manufacturing seamless tubes

B - Operations, Transporting

21

B

80/18, 80/52

B21B 19/00 (2006.01) B21B 17/04 (2006.01)

Patent

CA 2015124

ABSTRACT Seamless tubes are manufactured from a hollow ingot introduced into a continuous-tube rolling mill. The hollow ingot is deformed, directly before introduction into a first stand of the rolling mill, so that without reduction in wall thickness the clearance between a mandrel and an inner surface of the hollow ingot in the region of a base of the groove of the rolls of the first stand is greater than the clearance in the region of roll flanks of the first stand. This advantageously increases the stretch in the first roll groove so that, on one hand, the total stretch limit can be increased and, on the other hand, the central roll groove can be relieved.

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