Device for production of a seamless hollow body from steel

B - Operations – Transporting – 21 – B

Patent

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B21B 19/04 (2006.01)

Patent

CA 2611870

The invention relates to a device for the production of a seamless hollow body (10) from a solid round block (7) of steel with a diameter < 95 % of the diameter of the solid round block by means of a twin-roller cross-rolling mill on a mandrel plug (3) held between the cross rollers (1), comprising a piercing piece (5) and at least one finishing piece (4) using pass-closing guides or with a three roller cross rolling mill on a mandrel plug held between the cross rollers, comprising a piercing piece and at least one finishing piece, whereby the separation of the rollers is adjusted in a particular manner at the narrowest cross-section in relation to the diameter (2) of the round block employed and the position of the piercing mandrel in relation to the narrowest cross-section of the rollers.

Dispositif destiné à la fabrication d'un corps creux (10) sans soudure à partir d'un bloc rond massif (7) en acier, ayant un diamètre inférieur à 95 % du diamètre du bloc rond massif, à l'aide d'un laminoir à cylindres obliques comportant deux cylindres et d'un poinçon (3) retenu entre les cylindres de laminoir (1) et comportant une partie de perçage (5) et au moins une partie de polissage (4), associés à des éléments de guidage déterminant le diamètre interne, ou à l'aide d'un laminoir à cylindres obliques à trois cylindres et à l'aide d'un poinçon retenu entre les cylindres de laminoir et comportant une partie de perçage et au moins une partie de polissage, l'écart entre les cylindres dans la section transversale la plus étroite en relation au diamètre (2) du bloc rond utilisé et la position du poinçon par rapport à la section transversale la plus étroite des cylindres étant ajustés de manière déterminée.

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