Publication Type:

Conference Proceedings

Source:

COPEN- 10, IIT Madras (2017)

Keywords:

Chip morphology, Cryogenic machining, Cutting forces, FEM simulation, Micro turning, Titanium alloy

Abstract:

In the past few years there is a rise in demand for sustainable micro turned titanium alloy components in the field of aeronautical and
biomedical industries. But the major issues in micro turning of Ti-6Al-4V are fluctuations in the cutting force due to saw-tooth chip
formation, chip adhesion on the cutting tool due to chemical affinity and high temperature in the tool-chip interface zone due to low
thermal conductivity. So the experimental analysis of addressing these issues of titanium alloy are expensive. In view of this, in the
present work, a finite element simulations are developed to understand the process mechanics and also to predict the cutting, thrust and
feed forces, tool-chip interface temperature and chip morphology during dry and in-situ cryogenic micro turning process. Finite element
simulations are developed using updated lagrangian approach by taking into account of edge radius, liquid nitrogen cooling and work
hardening effects. A cylindrical heat exchange window is used in the simulation for in-situ cryogenic cooling. Finite element
simulations are calibrated for various shear friction factors and finally validated with the forces and chip morphology results measured
experimentally. It is inferred that in-situ cryogenic micro turning results in favorable chip formation, less tool-chip interface temperature
and minimize the formation of saw-tooth chip which lead to increase the overall accuracy and precision of micro turned titanium alloy
implants. However there is an increase in cutting forces when compared with dry machining due to cryogenic cooling and size effects.

Cite this Research Publication

T. Jagadesh and L, S. G., “Finite Element Modeling for Prediction of Cutting Forces during Micro Turning of Titanium Alloy”, COPEN- 10, IIT Madras. 2017.

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