关键词: 关键词：切削加工性；钛合金；立方氮化硼刀具

Abstract:

PCBN tools were used for the turning of TC4. The cutting forces and roughness for turned surfaces were measured and analyzed by

using singlefactor turning experiments. Tool wear was measured under a microscope, SEM and EDS analyses were carried out on

the worn tools to determine the tool wear mechanisms. Major tool failure patterns were crater wear, flank wear and notch wear

due to adhesive wear, chemical wear and brittle fracture. The diagonal orthogonal regression experimental method was used to

investigate tool life of PCBN for turning TC4 titanium alloys. The results have shown that PCBN tools at the cutting conditions

of higher cutting speed, lower feed rate and lower depth of cut have a longer tool life, lower cutting force, better surface

roughness, which means that PCBN tools are adapted in precision processes of machining the titanium alloy TC4.

Key words: Key words: machinability; titanium alloy; PCBN tools