B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 21/00 (2006.01)
Patent
CA 2234218
The present invention relates to a process and an apparatus for manufacturing tubes, preferably from high-strength steels or special alloys, using the cold pilger step-by-step process, with two roll stands that can be driven, at least intermittently, back and forth in opposite directions by crank drives, said roll stands having tapering grooved rolls that are driven by rack-and-pinion systems and roll over the rolled stock with alternating directions of rotation. The present invention is characterised in that the greater part of the shaping work is performed on the first roll stand and a lesser part is performed on the second roll, where additional smoothing is carried out; and in that in bath roll stands reducing rolling is carried out over a mandrel that is matched to the roll calibre; and in that the angular offset of the crank drive systems is so selected that the shaping zone on the first stand does not coincide in time with the shaping zone of the second stand. The present invention also relates to a machine for carrying out the process.
Baensch Michael
Stinnertz Horst
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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