Mannesmann Aktiengesellschaft

Wilfried Schmidt

Bernd Kreft

Wilheim Nickel

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

Theodor Schmitz

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.

Process for producing a cylinder with a bulge

A vertical strip storage device for bridging strip running interruptions in continuous strip production includes a supporting frame forming a looping tower. The continuous strip is looped around deflecting rollers mounted on upper and lower horizontal roller bridges. The roller bridges move synchronously and vertically, one above the other, toward and away from one another. The inherent weight of one roller bridge compensates for the inherent weight of the other roller bridge as a counterweight. A joint cable drive is used to move the roller bridges. One of the roller bridges is at the upward cable portion of the vertically deflected joint cable drive and the other roller bridge is at the downward cable portion of this vertically deflected joint cable drive. The joint cable drive includes pulley blocks supported in the upper region and in the lower region of the supporting frame. Each pulley block includes stationary rollers connected to the supporting frame and loose rollers connected to the respective roller bridges. A cable of each pulley block is guided to a cable drum such that when the cable drum rotates, the associated roller bridge moves.

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Erkrath, Germany

Wilfried Schmidt