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Appointing subsurface material properties of Ti6242 and Udimet720 by high speed 5-axis machining

 
: Klocke, F.; Albrecht, J.; Bergs, T.; Meinecke, M.; Rohde, L.

International Institution for Production Engineering Research -CIRP-, Paris:
CIRP 2nd International Conference on High Performance Cutting 2006. CD-ROM : June 12 - 13, 2006, Vancouver, BC
Vancouver, 2006
10 pp.
International Conference on High Performance Cutting <2, 2006, Vancouver>
English
Conference Paper
Fraunhofer IPT ()
Oberfläche; Titanlegierung; maschinelle Bearbeitung; Hochgeschwindigkeit; Zerspanbarkeit; Simulation; Spanbildung; Feinfräsen; Schnittgeschwindigkeit; Verfahrensparameter; Verschleiß; Eigenspannung; Standzeit; Ermüdung bei hohen Lastspielzahlen; Korngefüge; Temperaturbereich; Schmiedemetall; Nickellegierung; Spanwinkel

Abstract
In this paper the complex dependencies between machining parameters and resulting properties for a typical multi-step process consisting of roughing, pre-finishing and finishing operations are discussed. First the machinability is analyzed through simulation and analogy tests due to fundamental phenomena such as chip geometry and the material specific influence on chip formation. Secondly parameter windows for each of the different process steps are defined. During the finish milling process cutting velocities of up to 400 m/min for Ti6242 and 150 m/min for Udimet 720 LI are tested. To evaluate the different process parameters, forces are experimentally measured and the wear behavior is analyzed. Subsurface material properties are directly affecting the service performance of thermo-mechanically highly loaded parts such as aero engine components. For this purpose, surface processes subsequent to machining operations are conducted to induce a beneficial state of residual stresses. The paper on hand investigates material properties of technical surfaces that have been machined with parameter sets characterized by high cutting velocities v(ind.c) = 100 m/min to 400 m/min for Ti6242 and v(ind.c) = 50 m/min to 150 m/min for Udimet 720 LI. Therefore, different tool geometries have been tested with regards to maximum tool life at optimized material removal rates. The resulting characteristics of the surfaces may give practical support for process planners to design their process chain. With the correlations presented in this paper the first step to a comprehensive understanding of the dependencies between high speed machining and a component's properties is achieved.
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: http://publica.fraunhofer.de/documents/N-65127.html