Alcan Technology & Management Ltd.

Christian Leppin

Markus Gehrig

Pius Schwellinger

A process for forming an initial section or like component featuring a hollow interior to a final shape by high internal pressure in the sealed hollow interior using a medium that can flow. In order to shape-form the initial section featuring at least one corner region&#x2014;preferably at least two corner regions&#x2014;the wall sections adjacent to the corner region are preshaped in a curved manner&#x2014;as viewed in cross-section&#x2014;counter to the direction of applied pressure, and subsequently re-shaped by applying the high internal pressure of the medium that can flow, displacing the corner region in the direction in which the pressure is applied. To that end a section with hollow space delimited by section walls is employed in which two section walls define each corner region of the section cross-section, whereby at least one of the section walls at the corner region features a region that is curved in cross-section. Preferred is a polygonal cross-section, the section walls of which feature the inwards curved region between each of the corner regions or, such in which selected section walls connecting two corner regions each feature a curved region.

Method for shaping an initial profile or a similar workpiece using an internal high pressure and profile therefor

A device for forming a single or mutli-chamber workpiece by high internal pressure created by a medium capable of flow in the hollow interior of the workpiece. The device contains a forming tool with a cavity accommodating the workpiece and pressure generating equipment for generating the high internal pressure. The pressure generating equipment contains a displacement pump with a pressure converter having a longitudinally coupled displacement body with different working surface areas A , A , which operates with a stroke frequency f, whereby strokes of the pressure converter cause a pressure p created on the primary side to be raised until a higher secondary pressure p is reached on the secondary side.

High internal pressure forming process

A process for forming a starting profile with a profile cavity by a bending forming process and an internal high pressure produced in a sealed profiled cavity by way of a fluid, including the steps of initially, before forming by internal high pressure, forming a starting profile at a distance from free ends of the starting profile and across a longitudinal axis of the starting profile into a cross-section with favorable bending properties, by one of transversely inwardly bent side walls of the starting profile, folding during bending, flat pressing or a flat high-sided profile produced in an extrusion process.

Method for forming an initial profile or a tool of the kind and a profile therefor

The invention relates to a method for shaping an initial profile ( ) or a similar workpiece, which comprises a profile space, into a final profile by using an internal high pressure that is generated in the sealed profile space by a flowable active medium. In order to shape the initial profile ( ) comprising at least one corner area ( ), preferably at least two corner area ( ), wall sections ( ) which connect in the corner area ( ) are preshaped such that their cross-sections are curved counter to the direction of pressure, and are subsequently straightened by the internal high pressure of the flowable active medium while displacing the corner area ( ) in a direction of pressure. To this end, a profile comprising a profile space that is delimited by profile walls ( ) is used in which two profile walls ( ) define a corner area ( ) of the profile cross-section, whereby at least one of the profile walls ( ) connecting in the corner area ( ) is provided with an area ( ) having a curved cross-section. A polygonal cross-section whose profile walls ( ) between the corner areas ( ) each comprise the inwardly curved area ( ) or with which selected profile walls ( ) which connect two corner areas ( ) preferably offer a curved area ( ).

Growing community of inventors

Schaffhausen, Switzerland

Christian Leppin