双重润滑条件下的刀具切削特性研究

为实现清洁切削技术，将Al2O3包覆CaF2复合粉体作为添加相，采用真空热压烧结工艺制备了一种Ti(C,N)基自润滑金属陶瓷刀具（TMC刀具），研究了Ti(C,N)基金属陶瓷刀具在微量润滑作用下切削300M钢的切削性能，结果表明：双重润滑与干切削方式相比，其三向切削力FX、FY、FZ分别减小了36.8%、13.1%和32.2%，切削温度下降了44.3%，相同切削距离条件下刀具后刀面磨损得到了明显改善，这有利于延长刀具的寿命和改善已加工表面质量。此外，能谱分析结果表明，刀具前后刀面均形成了固体润滑膜，起到了减摩作用。采用双重润滑方式有效降低了黏结磨损和氧化磨损。

Cutting Characteristics of Tools under Dual Lubrication Conditions

 To realize the clean cutting technology, a Ti(C,N)-based self-lubricating cermet tool(TMC tool) was prepared by using a vacuum hot-press sintering process and an Al2O3-coated CaF2 composite powder as the additive phase, and the cutting performances of Ti(C,N)-based self-lubricating cermet for cutting 300M steel were investigated under the effect of MQL, the results show that the three-way cutting forces FX、FY、FZ are decreased by 36.8%, 13.1% and 32.2%, respectively, and the cutting temperature decreased by 44.3% for the dual lubrication compared with the dry cutting method. The wear on the flank faces of the tools is significantly improved under the same cutting distance condition, which is beneficial to prolong the tool life and improve the machined surface quality. In addition, energy dispersive spectrum(EDS) analysis results show that the solid lubricating films are formed on the rake faces and flank surfaces of the tools to reduce the friction. Dual lubrication effectiveness is adopted to effectively reduce the adhesive wear and oxidation wear.