GH4169抗疲劳表面砂带磨削工艺参数优化

Optimization of Process Parameters for GH4169 Anti-Fatigue Surface Abrasive Belt Grinding

GH4169高温合金广泛应用于航空发动机热端构件,提高GH4169高温合金叶片抗疲劳性能对于航空发动机的长期稳定服役意义重大。砂带磨削作为航空发动机叶片的精加工工艺,磨削参数与磨削后的表面状态及抗疲劳性能密切相关。为揭示砂带磨削工艺参数对磨削表面抗疲劳性能的影响,本研究采用不同工艺参数对GH4169高温合金疲劳试样进行砂带磨削加工,探究了工艺参数对表面完整性、疲劳寿命的影响规律。结果表明,线速度、进给速度和下压力对磨削后GH4169高温合金试样表面的粗糙度、残余应力均有显著影响。当线速度v=11 m/s,进给速度f=1000 mm/min,下压力F=3 N时,抗疲劳性能最优;当线速度大于15 m/s且下压力大于6 N时,GH4169高温合金表面表面质量降低、划痕深度增加、烧伤现象严重,试样表面表现为残余拉应力状态,会极大降低试样疲劳性能。

GH4169 superalloy is widely used in aero-engine hot components,and improving the fatigue resistance of GH4169 superalloy aero-engine blades is of great significance for the long-term stable service of aero-engines.Abrasive belt grinding is a finishing process of aero-engine blades,and the grinding parameters are closely related to the surface state and fatigue resistance after grinding.To reveal the effect of abrasive belt grinding process parameters on the fatigue resistance of the ground surface,this study carried out abrasive belt grinding on GH4169 superalloy fatigue samples with different process parameters and explored the influence of process parameters on surface integrity and fatigue life law.The results show that the line speed,feed speed,and downforce have significant effects on the surface roughness and residual stress of the GH4169 superalloy workpiece after grinding.When v=11 m/s,f=1000 mm/min,F=3 N,the fatigue resistance is the best.When the linear velocity is greater than 15 m/s and the downward pressure is greater than 6 N,the surface quality of GH4169 superalloy decreases,the depth of scratches increases,and the burning phenomenon is serious.