Abstract
To improve the machining surface integrity of HT250 gray cast iron, (W,Ti,Ta)C based nano-self-lubricating cermet tools containing nano CaF2 were successfully prepared by spark plasma sintering (SPS). When the content of nano CaF2 was 5 vol%, the flexural strength, hardness, and fracture toughness of (W,Ti,Ta)C/CaF2 nano-self-lubricating cermet tool were 1134 ± 39 MPa, 18.97 ± 0.22 GPa and 8.52 ± 0.33 MPa·m1/2, respectively. The cutting experiments were carried out by minimum quantity lubrication (MQL), and the effects of nano CaF2 content and MQL on cutting performance were studied. The cermet tool with 5 vol% nano CaF2 had the optimized cutting performance under MQL conditions, with cutting forces FX, FY, and FZ reduced by 20.5%, 37.9%, and 33.3%, respectively, cutting temperature decreased by 34.8%, and tool life increased by 16.7%. The solid-liquid dual lubrication cutting method combined with the solid lubrication CaF2 and MQL effectively reduced the thickness and oxidation degree of the work hardening layer. The optimized surface roughness of the workpiece after machining was 0.89 ± 0.05 μm, which is 27.6% lower than that of dry cutting.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call