公开(公告)号：US11167338B2

公开(公告)日：2021-11-09

申请号：US16092871

申请日：2017-03-31

申请人： SMS group GmbH

发明人： Karsten Busch ,  Paul-Josef Nieschwietz ,  Frederik Knauf

IPC分类号： F15B11/02 ,  B21J9/12 ,  F15B11/036 ,  F15B15/14

摘要： A hydraulic cylinder comprising a cylinder, a piston element movably guided in the cylinder in a working direction and comprising an active surface, and a first opening for feeding a fluid into a cylinder chamber by the active surface. A working pressure of the fluid acting on the active surface drives the piston element in the working direction. The active surface includes a first partial surface and at least one second partial surface, the cylinder chamber being divided into a first sub chamber with the first opening by the first active surface and a second partial surface with a second opening by the second partial surface, and the partial surfaces are hydraulically separated from each other at least in a selectable operating mode.

公开(公告)号：US11498116B2

公开(公告)日：2022-11-15

申请号：US16496016

申请日：2018-01-31

申请人： SMS Group GmbH

发明人： Stephan Ackermann ,  Markus Schaprian ,  Frederik Knauf

IPC分类号： B21H1/22 ,  B21J13/12 ,  B21D1/05 ,  B21H9/00

摘要： A stretch rolling method and a stretch rolling unit can roll out any gripping ends and uses the narrowest possible installation space. In the stretch rolling method, a workpiece is successively fed to at least two passes of a stretch rolling unit of a gripping device, wherein the workpiece is rotated by 180° about an axis of rotation lying perpendicular to the main direction of extent of the workpiece between the first pass of the two passes and the second pass of the two passes.