Experimental evaluation of tool wear and surface roughness under different conditions in high-speed turning of Ti6Al4V alloy

İngilizce (OpenAlex)

In high-speed machining of titanium alloys, due to their difficult-to-cut characteristics, tool performance and surface integrity are greatly influenced by the generated large amount of heat in the cutting zone. High cutting speeds lead to more severe abrasion, adhesion, and diffusion wear mechanisms and thus, decrease tool life rapidly. Therefore, the identification of an effective cooling/lubrication strategy is critical to enhance tool performance and surface finish. In this study, the effects of four different cooling/lubrication conditions (dry, conventional cutting fluid (CCF), minimum quantity lubrication (MQL), and cryogenic cooling) on tool wear and average surface roughness (Ra) in high-speed turning of Ti6Al4V alloy were investigated. Three cutting speeds (125, 250 and 350 m/min) were employed by keeping depth of cut (0.5 mm) and feed (0.1 mm) constant. For each condition, the variations of flank and crater wears with cutting length were determined. According to test results, high speeds caused an increase in temperature and this led to adhesive and abrasive wear mechanisms being effective simultaneously. Besides, the use of high speeds reduced the effects of coolants and/or lubricants. Due to the effective cooling and lubrication, lower Ra values were obtained under CCF conditions.