B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 27/02 (2006.01) B21B 23/00 (2006.01)
Patent
CA 2745586
The invention relates to a method for producing seamless tubes from metal, particularly from steel, wherein a previously produced hot hollow block is stretched by means of a three-roll bar rolling mill on a mandrel to form a parent tube and, before running into the bar rolling mill, the hollow block is provided with a rolling step that makes the diameter more uniform by means of an upstream stand. It is in this case provided that the rolls of the upstream stand are moved apart and together to the same extent as the deforming stands of the bar rolling mill, wherein the calibrating base radius of the rolls of the upstream stand extends over 60° and this is followed by a flank radius with a tangential transition which is dimensioned such that even with the maximum adjustment of the rolls in the region of the flank there is virtually no diameter reduction of the largest hollow block diameter to be expected.
L'invention concerne un procédé de fabrication de tubes sans soudure en métal, notamment en acier, un bloc creux chaud produit préalablement étant étiré en un tube principal sur un mandrin au moyen d'un laminoir à barres à trois cylindres et le bloc creux étant pourvu avant d'entrer dans le laminoir à barres d'un pas de cylindre uniformisant le diamètre par l'intermédiaire d'une cage en amont. Il est prévu que les cylindres de la cage en amont soient écartés et rapprochés comme les cages de déformation du laminoir à barres, le rayon de base de calibrage des cylindres de la cage en amont s'étendant sur 60° et un rayon de flanc à transition tangentielle qui est dimensionné de manière qu'il n'y ait pratiquement pas de réduction du plus grand diamètre du bloc creux escompté dans la région des flancs, même en cas de rapprochement maximal des cylindres, fait suite à ce rayon de base.
Bellmann Manfred
Braun Winfried
Kenichi Sasaki
Kinugasa Hidenori
Kuemmerling Rolf
Fetherstonhaugh & Co.
Sumitomo Metal Industries Ltd.
V. & M. Deutschland Gmbh
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