| Abstract: | This paper compared performance of commercially available tool coatings for micromilling of wrought H13 tool steel in minimum quantity lubrication condition. Performance of uncoated WC-Co tool was evaluated against six different coatings --Nano3, Uni+, TiSiNext, AlTiN, TiN, and TiAlN. Line and area surface finish of micromilled channels, and channel width were used as tool evaluating criteria. Scanning electron microscopy observation revealed the similar wear mechanism of coated microtools; the thin coating was worn out in abrasive mode following by attrition wear of the WC-Co substrate due to spalling of built-up edges and substrate. Although the measured surface finish was higher than the theoretical value, both Nano3 and Uni+ produced lowest surface finish compared to other coatings. A low cutting speed of 20m/min significantly produced lower and stable surface finish compared to those after 40 m/min cutting speed. The electronic version of this dissertation is accessible from https://hdl.handle.net/1969.1/197957 |
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