Influence of the Crystallographic Orientation of a Directionally Solidified Nickel-Based Superalloy on Macroscopic Grinding Forces

6 Pages Posted: 10 Nov 2020

See all articles by Adina Grimmert

Adina Grimmert

MTU Aero Engines AG

Lisa Dankl

MTU Aero Engines AG

Petra Wiederkehr

TU Dortmund University

Date Written: October 30, 2020

Abstract

In aerospace industry profile and surface grinding processes are key operations in the machining of turbine blades. The calculation of grinding forces depending on process parameters, e.g., depth of cut and feed rate, offers the possibility of pre-designing the process in order to reduce efforts for preliminary experimental tests and to avoid mechanically overloading the workpiece. For this purpose, a material-dependent macroscopic force model for isotropic materials was determined in a preliminary work. However, turbine blades are usually made of directionally solidified superalloys that can withstand higher temperatures than common alloys leading to a higher engine efficiency. In this paper, the effects of the anisotropic mechanical properties of these materials on grinding forces are discussed. Therefore, experimental studies on a surface grinding process were carried out using directionally solidified MAR 247 samples consisting of four different primary orientations with respect to the grinding direction. The forces were measured with a dynamometer and the results were used to decide whether the crystallographic orientation has to be implemented in a macroscopic grinding force model.

Keywords: Grinding; Force; Anisotropy; Modeling

Suggested Citation

Grimmert, Adina and Dankl, Lisa and Wiederkehr, Petra, Influence of the Crystallographic Orientation of a Directionally Solidified Nickel-Based Superalloy on Macroscopic Grinding Forces (October 30, 2020). Proceedings of the Machining Innovations Conference (MIC) 2020, Available at SSRN: https://ssrn.com/abstract=3722049 or http://dx.doi.org/10.2139/ssrn.3722049

Adina Grimmert (Contact Author)

MTU Aero Engines AG ( email )

Lisa Dankl

MTU Aero Engines AG ( email )

Petra Wiederkehr

TU Dortmund University ( email )

Friedrich-Wöhler-Weg 6
Dortmund, 44227
Germany

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