公开(公告)号：US10670052B2

公开(公告)日：2020-06-02

申请号：US16066701

申请日：2017-02-01

Applicant: SMS GROUP GMBH

Inventor： Hermann-Josef Klingen ,  Uwe Muschalik ,  Ekhard Siemer ,  Karl Herrmann Claasen ,  Valentin Gala Losada ,  Andreas Wershofen-Crombach

IPC: F15B13/02 ,  F15B15/14 ,  F15B15/20 ,  F15B11/22

Abstract: A double-rod ram (1), preferably for an extruder, comprising an outer cylinder (10), an inner cylinder (20) installed therein and arranged concentrically therewith, a double-acting work piston (41) provided in the inner cylinder to be displaceable and a bypass device (50) with at least one bypass valve (52), wherein the work piston (41) divides the inner cylinder (20) into two compartments (42) and can be loaded with a hydraulic fluid from both compartments (42), wherein the bypass device (50) is so arranged that in a bypass position of the bypass valve (52) a fluid connection between the two compartments (42) is formed by a direct connection, preferably at least one bypass line, and in a work position of the bypass valve (52) no such fluid connection is present.

公开(公告)号：US10906077B2

公开(公告)日：2021-02-02

申请号：US15638535

申请日：2017-06-30

Applicant: SMS group GmbH

Inventor： Uwe Muschalik ,  Jens Magenheimer ,  Anna Rott ,  Koos van Putten

IPC: B21C25/04 ,  B21C23/08 ,  B21C23/21 ,  B21C25/08 ,  B21C23/20

Abstract: If a mandrel for extruding metal pipes, having two axially offset pressing surfaces with different radial characteristics and having a transition region between these two pressing surfaces has a support surface in the transition region then the negative effect of narrowing, which arises owing to the mandrel shifting from a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the die, can be minimized.

公开(公告)号：US10882091B2

公开(公告)日：2021-01-05

申请号：US16062906

申请日：2016-12-14

Applicant: SMS group GmbH

Inventor： Uwe Muschalik

IPC: B21C23/21

Abstract: An extruder and tube extruder or metal extrusion press that has a press frame, which is composed of a cylinder bar and a counter bar connected to said cylinder bar, in which a movable block receiver holder that bears a block receiver and a movable plunger traverse are provided. A main cylinder or pressing cylinder is arranged in the cylinder bar. The cylinder receiving in its cylinder housing a pressing piston provided with a pressing plunger, and in which an equalization container is arranged in the cylinder housing. The container supplying hydraulic oil to the pressing piston by a slide plate provided on a central linkage. A filling valve that has a lid-like valve cone is formed in the transition from the equalization container to the cylinder housing.