Study on surface work hardening of titanium alloy milled by micro-textured ball milling cutter

Abstract

The control variable method is a method to study the influence of a certain factor on the result quantity by artificially controlling other factors. Some researches have shown that a micro-texture can effectively reduce the surface work-hardening degree of the tool surface. Therefore, in this study, based on the control variable method, a micro-texture ball-end milling cutter was used to mill titanium alloy. The influence rules of micro-texture distance from edge, micro-texture distribution type and mode and cutting stroke on work hardening degree were analysed. The results show that the surface work-hardening degree was the smallest(118%) at a distance of 90 μm from the cutting edge and at a 0.3° offset angle. When the micro-texture is micro-pit texture, the work hardening degree is 121% and is minimum. The content of the O element in the surface modification layer of the micro-textured tool is 6.97%, which is less than 16.17% of that of the non-textured tool, and the content of the C element is 4.95% and 4.97% respectively. The results show that the micro-texture placement can effectively reduce the oxidation degree and work hardening degree of the machined surface of the milled titanium alloy.