Mannesmann Aktiengesellschaft

Theodor Schmitz

Wilfried Schmidt

Wilheim Nickel

Hans-J&uuml;rgen Schl&uuml;ssel

A process for producing a cylinder having at least one longitudinally extending outward bulge and a steel base, for a piston-cylinder unit. The process including the steps of initially machining a round input ingot to size, the ingot having a length, subsequently heating the ingot to a deformation temperature between 1250&deg; C. and 1310&deg; C., descaling an entire surface of the heated ingot with pressurized water, subsequently inserting the ingot into a mold, piercing the ingot in a sharply increasing manner using a mandrel so as to form a pierced piece with a base, applying a lubricant to the mold and the mandrel prior to piercing, subsequently ejecting the pierced piece from the mold, cooling and descaling the ejected pierced piece, and mechanically finish-machining the pierced piece to produce the cylinder.

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Grevenbroich, Germany

Theodor Schmitz