Borgwarner Inc.

Stefan Eisinger

Gerald Schall

Frank Scherrer

Michael Loewenberg

Adnan Adilovic

Menno Roder

Juergen Strelbitski

Dominik Kuss

Achim Klein

Silvio Koch

Daniela Cempirkova

Steffen Bereswill

Tom Cvjetkovic

Stefan Hambel

Erich Ostermeyer

A turbocharger wheel () and shaft () assembly exhibits a frustoconical geometry of welding zone contact surfaces extending to the outer circumference of the shaft (). This frustoconical geometry not only allows continuous centering of the parts () during joining, it also eliminates the problem of stress propagation along a plane. The location of the electron beam is shifted so that only the radially outer segment of the frustoconical contact surface is joined by welding, leaving a radially inner unmelted and unfused zone for maintaining firm contact of the oblique surfaces.

Method of joining by electron beam or laser welding a turbocharger turbine wheel to a shaft; corresponding turbocharger turbine wheel

A TiAl alloy comprising the elements C, Si, B, Al and Ti, wherein a C fraction is &#x2264;0.5 wt %, an Si fraction is 0.05-2.5 wt %, a B fraction is &#x2264;0.4 wt % and an Al fraction is 25-43 wt %, in each case in relation to the total weight of the alloy.

TiAl alloy, in particular for turbocharger applications, turbocharger component, turbocharger and method for producing the TiAl  alloy

A process for producing a turbine rotor (), which has, as joining partners, a turbine wheel () made of TiAl and a shaft () produced from steel, with the following process steps: providing the turbine wheel (); providing a solder; providing the shaft (); and connecting the turbine wheel () and the shaft () by electron beam soldering by means of an electron beam ().

Process for producing a turbine rotor

A turbine wheel () of an exhaust-gas turbocharger (), formed from a titanium aluminide material, having a wheel back () which is of closed configuration as viewed from an axial direction (A) and which has an outer contour (), a hub () which extends from the wheel back () and which tapers along the axial direction (A), and a multiplicity of turbine blades () which extend from the wheel back () and from the hub () and which blades extend outward in a radial direction (R), as far as a connection region outer diameter (DAB) at least in a connection region (). The wheel back () has, in an outer region () adjoining the connection region (), a wheel back outer diameter (DRR) which is greater than or equal to the connection region outer diameter (DAB).

Turbine wheel of an exhaust-gas turbocharger

The invention relates to a device () for machining a stepped shaft (), having a workpiece rest (); having a disk arrangement () which has a grinding disk () and a control disk (); and having an axial stop arrangement (), wherein the axial stop arrangement () has a contact adapter () which can be temporarily placed in contact with an end surface portion () of the shaft () and which has a punctiform contact surface () for contact against a stop part () of the stop arrangement ().

Method and device for machining shafts

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Bornheim, Germany

Stefan Eisinger