高速铣削中TaC(NbC)对硬质合金刀具磨损性能的影响

Influences of TaC(NbC)on Cemented Carbide Tool Wear Resistance in High Speed Milling

针对航空航天钛合金加工时硬质合金刀具磨损过快的难题,制备了主元素一致、微量合金碳化物TaC(NbC)含量不同的两种WC-Co基硬质合金材料。采用高温维氏硬度计检测两种材料的高温硬度和高温断裂韧性,并制备相同几何参数的立铣刀对钛合金TC4进行铣削加工试验。试验结果表明:在硬质合金中添加微量合金碳化物TaC(NbC),可以同时提高材料的高温硬度和高温断裂韧性,在相同的切削条件下,添加微量合金碳化物TaC(NbC)的硬质合金立铣刀比未添加微量合金碳化物的立铣刀耐磨性更好,刃口断裂裂纹更少,刀具使用寿命更长,更适合航空航天钛合金材料的高速铣削加工。

Aiming at the problems of fast wear of cemented carbide tools in the machining processes of aerospace titanium alloys,two WC-Co cemented carbide materials with the same main elements and different contents of TaC(NbC)were prepared herein.High temperature hardness and high temperature toughness of two carbide materials were measured by high temperature Vickers hardness tester.Then,the milling experiments of titanium alloy TC4 were performed with end-mills which were made of these two materials.The experimental results show that the high temperature hardness and high temperature toughness may be improved by adding TaC(NbC)to the cemented carbide materials.Under the same cutting conditions,the wear resistance of cemented carbide tools with TaC(NbC)is better than that without TaC(NbC).The tools with TaC(NbC)have less fracture cracks,longer tool life,and are more suitable for high speed milling of aerospace titanium alloy TC4.