Mannesmann Aktiengesellschaft

V&m Deutschland Gmbh

Gunther Manig

Rolf Kümmerling

Gustav Zouhar

Heinz Kron

Karlheinz Kutzenberger

The invention relates to an apparatus for making a seamless hollow body () from a solid round block () of steel with a diameter &#x3c;95% of the diameter of the solid round block by means of a two-roll cross-rolling mill with a piercing mandrel () held between the inclined roll () and including a piercer () and at least one smoothing part () using pass-closing guides, or by means of a three-roll cross rolling mill with a piercing mandrel held between the inclined rolls and including a piercer and at least one smoothing part, wherein the distance of the rolls is adjusted in a particular manner at the narrowest cross-section () in relation to the diameter of the used round block, and the position of the piercing mandrel is adjusted in relation to the narrowest cross-section of the rollers.

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Munich, Georgia

Gunther Manig