Cutting Temperature and Cutting Forces in High-speed Cutting of Titanium Matrix Composites with PCD Tool

摘要

High-speed machining tests were performed on vol.(0-10%) TiC_p/Ti6Al4V and vol.10% (TiC_p+TiB_w)/Ti6Al4V composite in the speed range of 15-150 m/min using Polycrystalline Diamond (PCD) tools to investigate the cutting temperatures and cutting forces. The results showed that the cutting temperature range was 260-590 °C under the cutting parameters used. Cutting speed and tool wear had a significant effect on cutting temperature. For all the machining tests, the cutting temperature for the new tool was 60-100 °C higher than that for the worn tool (VB=0.1 mm) at all cutting speed levels used. The cutting temperature for the titanium matrix composites was 40-90 °C higher than that for the Ti6Al4V matrix. However, it slightly decreased when relatively higher volume fraction composites were used. The cutting forces increase by 15% with the increasing cutting speed at the range of 15-100 m/min but they increase by up to 35% when the cutting speed is between 100 m/min and 150 m/min. The cutting forces increased slightly or even decreased with the increasing cutting speed when using a worn tool, also they moderately increased when machining the workpiece with higher reinforcement volume fraction. The cutting forces significantly increased with the increasing tool flank wear especially for the peripheral force and feed force which increased 300-500 percentages.