Effect of cryogenic cooling and tool wear on surface integrity of turned Ti-6Al-4V
Paper i proceeding, 2018

The aim of this work is to investigate the influence of flank wear and cutting fluid (emulsion vs. liquid nitrogen) on surface integrity in turning of titanium alloy Ti-6Al-4V. Longitudinal turning tests with pre-worn uncoated cemented carbide inserts are performed, after which the surface and subsurface layer of machined workpieces is studied. Results for residual stresses on the surface as well as in depth profiles, obtained by X-ray diffraction, are also presented. Scanning electron microscopy (SEM) is used to investigate the microstructure of the workpieces. The same tool holder was used for both cooling conditions, with the same nozzle configuration. The flow rate of liquid nitrogen was therefore limited and as a result, tool wear development was observed to be faster for cryogenic cooling than emulsion-based flood cooling. However, the results show limited differences in terms of achievable residual stresses when comparing cryogenic and conventional cooling at similar levels of tool wear. Despite an increase in tool wear rate, the cryogenic cooling conditions thus provide similar surface integrity results as emulsion cooling. The results suggest that the consumption of the cryogenic coolant can be reduced or optimized without a significant impact on surface quality.

Titanium

Cryogenic machining

Surface Integrity

Författare

Simon Isakson

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Ibrahim Sadik

Chalmers, Industri- och materialvetenskap

Amir Malakizadi

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Peter Krajnik

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Procedia CIRP

2212-8271 (ISSN)

Vol. 71 254-259

4th CIRP Conference on Surface Integrity (CIRP CSI 2018)
Tianjin, China,

Ämneskategorier

Tribologi

Bearbetnings-, yt- och fogningsteknik

Metallurgi och metalliska material

DOI

10.1016/j.procir.2018.05.061

Mer information

Skapat

2018-08-02