Effect of the progressive tool wear on surface topography and chip formation in micro-milling of Ti–6Al–4V using Ti(C7N3)-based cermet micro-mill

Publication date: Available online 11 August 2019Source: Tribology InternationalAuthor(s): Yishun Wang, Bin Zou, Juncheng Wang, You Wu, Chuanzhen HuangAbstractTitanium alloy is extremely difficult to machine due to the rapid tool wear. The influence of tool wear on surface topography and chip formation, during micro-milling of Ti–6Al–4V, using Ti(C7N3)-based cermet micro-mill is investigated. The non-uniform surface quality was generated by alternative material removal mechanisms, at the cross-section of micro-slot. Metal debris and plastic side flow were more severe as the tool wear progressed, while the improved surface quality, at up-milling side, could be obtained relative to down-milling side. The micro-chips serration was formed, while the transition from α-Ti to β-Ti in micro-chips occurred as the tool wear progressed, due to the high strain and strain rate.Graphical abstract
Source: Tribology International - Category: Materials Science Source Type: research