Patent ID: 8844117
Filing Date: 2014-09-30
Classification: B23B,B23C,B23P,B23Q,F05B,Y10S,Y10T

Abstract:
1. A method for machining a turbocharger compressor impeller having a first end, an opposing second end, and a central bore that extends along a central bore axis from the first end to the second end, wherein the central bore axis is transverse to faces of the turbocharger compressor impeller that are located at the first and the second ends, respectively, said method comprising the steps of: holding a tool by a tool holder of a machine tool, clamping the turbocharger compressor impeller only at its first end and its second end, by attaching the turbocharger compressor impeller to an arbor, such that a section of the arbor projects into the central bore on the first end of the turbocharger compressor impeller in order to center the central bore axis of the turbocharger compressor impeller with respect to a rotational axis of the machine tool, which clamping occurs by seating the turbocharger compressor impeller with its first end on a work rest surface of a work rest, which work rest surface surrounds the arbor and is transverse with respect to the rotational axis of the machine tool, and which clamping occurs by applying a contact pressure onto the second end of the turbocharger compressor impeller with a counter-holder, said contact pressure acting in the direction of the central bore axis, wherein the work rest includes a central recessed region that is centered about the rotational axis of the machine tool, which central recessed region has a central recessed surface that is recessed with respect to the work rest surface and that extends transversely with respect to the rotational axis of the machine tool, wherein the arbor projects from the central recessed surface, and wherein the clamping of the turbocharger compressor impeller is such that there is a free space between the central recessed surface and said face that is at the first end of the turbocharger compressor impeller; machining the turbocharger compressor impeller with the held tool, and rotating the turbocharger compressor impeller about the central bore axis by a drive means.