纳米氧化锆增韧氧化铝基陶瓷刀具切削性能的研究（Ⅱ）

摘要

研究新型陶瓷刀具A15Zc和A20Z（c＋m）切削淬硬40Cr合金钢时的切削性能，并与已经商业化的陶瓷刀具SG4的切削性能进行了对比。结果表明：刀具后刀面磨损量随切削深度的增加而增大，而切削速度对刀具后刀面磨损量的影响较小；在较小的切削深度下切削时刀具具有良好的切削性能，A15Zc和A20Z（c＋m）的抗磨损能力都好于SG4刀具；刀具的主要磨损形态为前后刀面磨损，主要磨损机制为前刀面的黏结磨损和后刀面的磨粒磨损。%Compared to the commercial ceramic tool SG4,the performances of nano-scale ZrO2 toughening Al2O3 matrix ceram-ics tool in machining the hardened 40Cr alloy steel,such as A15Zc and A20Z(c+m),were studied. When the hardened 40Cr alloy steel is machined,the tool flank wear widthes of A15Zc and A20Z(c+m)are increased with an increase of the cut depth and the effect of cutting speed on cutting performance is small. A15Zc and A20Z(c+m)have stronger wear resistance than SG4 at the smaller cut depth. The main wear patterns are tool wear on the rake face and flank,and the main wear mechanisms are bonding wear on tool rake face and abrasive wear on tool flank.