PSI - Issue 53

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A. Teixeira et al. / Procedia Structural Integrity 53 (2024) 352–366 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 11. Tool wear for v c =150 m/min and f=0.1 mm/rev.

Fig. 12. Calculated tool flank wear rate (TWf) for each tested machining parameter.

In addition to measuring and quantifying tool-wear, this was also analysed qualitatively. As previously mentioned, digital microscopy and SEM analysis. Fig. 13 displays the wear observed on tool’s rake face, after machining, the machining parameters are displayed in the figure’s caption. Analysing Fig. 13., it can be observed that the wear is considerably higher for higher values of feed-rate, for all the tested values of cutting speed. However, regarding the cutting speed values, the wear is less severe for the higher values of cutting speed, with the conditions being depicted in Fig. 13 (b) and Fig. 13 (d), being quite similar. There is evidence of chipping on the tools’ rake face, with this phenomenon being more prominent for these lower cutting speed values (particularly 50 m/min). This can be attributed to a higher abrasive behaviour during cutting, usually observed at lower cutting speed values (Sivaraman et al., 2012). Additionally, there can be some form of excessive vibrations felt during cutting at these lower cutting speed values, that can cause a higher amount of tool-wear.