为研究 PCBN 刀具在高速车削钛合金时的性能，选用 PCBN 刀具 YCB121和硬质合金刀具GC1105两种不同材料的刀具进行了对比研究。在切削速度为139 m/min条件下进行了干式车削TC4钛合金试验，研究分析了两种刀具在不同切削时期的磨损形貌，并对刀具耐用度做了对比，结果表明：在此切削速度下，硬质合金刀具前刀面为月牙洼磨损，后刀面为沟槽磨损；PCBN刀具前刀面以刃口崩刃为主，后刀面为不均匀的深沟槽磨损；YCB121的PCBN刀具比GC1105的涂层硬质合金刀具有更好的耐用度。%In order to study the performance of the high speed turning titanium alloy with PCBN cutting tools, the comparative study is carried out by choosing the cutting tools of different material named YCB121 (PCBN) and GC1105(Carbide). Under the condition of the cutting speed of 139 m/min, the tests of dry turning of TC4 titanium alloy have been carried out. The two different cutting tools were used to analyze wear morphology in different cutting periods and contrast the tool life. The results show that:at the speed of 139 m/min , the carbide tools show crater wear on the rake face and groove wear on the tool flank during cutting and the PCBN tools show tipping of cutting edge mainly on the rake face and uneven deep groove wear on the tool flank . PCBN tools with the grade of YCB121 has better tool life than coated carbide tools with the grade of GC1105.
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