GH4169高速车削参数对加工表面完整性影响研究

The Effects of Turning Parameters on Machining Surface Integrity in High Speed Turning GH4169

使用PVD-TiAlN涂层硬质合金刀片进行高温合金GH4169的高速车削正交试验,建立了表面完整性特征中表面粗糙度、表面残余应力、显微硬度的经验公式,分析了车削参数对表面完整性各特征量的影响规律,并观测了高速车削加工的表面形貌。结果表明:表面粗糙度随车削速度的增加而减小,随进给量和切削深度的增加而增大,进给量是影响表面粗糙度的最主要因素;随着进给量的增加,表面形貌变差;轴向残余应力表现为压应力,切向残余应力表现为拉应力,减小进给量,降低车削速度可减小车削加工的残余应力,轴向残余应力对进给量最敏感,切向残余应力对切削深度最敏感;显微硬度随车削速度的增大而增加,车削速度是影响显微硬度的主要因素。

The high speed turning superalloy GH4169 orthogonal test using the PVD-TiA1N carbide tool was pro- cessed to study the effect of cutting parameters on the surface integrity characteristics. The empirical formula for surface roughness, surface residual stress and microhardness was built and the machined surface morphology was observed. The prediction model between the surface integrity and cutting parameters was also established. The re- sults indicated that the surface roughness decreases with the increasing of cutting speed, while increases with the in- creasing of feed rate and cutting depth. Furthermore ,the feed rate is the key factor affecting the surface roughness. With the increasing of feed rate, the surface morphology becomes worse and with the decreasing of feed rate and cutting speed the surface residual stress can be decreased. It is also observed that the feed rate has the most signifi- cant influence on compressive residual stress in cutting direction, while the cutting depth has the most significant influence on tensile residual stress in feed direction; the microhardness increases with the increasing of cutting speed , and cutting speed is the key factor affecting microhardness.