通过设计正交试验,研究了 IC10 高温合金在缓进磨削过程中磨削工艺参数及表面粗糙度对疲劳寿命的影响规律,建立了工艺参数对磨削表面粗糙度及疲劳寿命影响的映射关系模型,并以表面粗糙度、疲劳寿命、材料去除率为优化目标进行了 IC10 高温合金缓进磨削工艺参数多目标优化。研究表明,IC10 高温合金磨削工件疲劳寿命随砂轮线速度的增加而增加,随工件进给速度和磨削深度的增加而减小,且疲劳寿命随砂轮线速度的变化最为敏感,工件进给速度次之,对磨削深度的变化敏感度最低。当表面粗糙度 R
a
由 0.44μm 增大到 0.94μm 时,磨削工件疲劳寿命由 9.69×10
6
降低到 1.25×10
6
,减小了约 87.1%,这表明磨削表面粗糙度对磨削疲劳寿命的影响非常显著。在综合考虑磨削表面粗糙度、疲劳寿命、材料去除率的情况下,通过多目标优化得到 IC10 高温合金缓进磨削工艺参数为:砂轮线速度 v
s
= 20m/s,工件进给速度 v
w
= 117mm/min,磨削深度 a
p
= 0.48mm。
Abstract
Orthogonal experiments were designed to research the effects of grinding parameters and surface roughness on the fatigue life of IC10 superalloy during creep feed grinding. Based on experimental results
empirical models of grinding parameters and surface roughness
fatigue life were established. Then multi-objective optimization of grinding parameters was carried out for smaller surface roughness
longer fatigue life and higher machining efficiency. The results show that the fatigue life increases with increasing grinding wheel speed while it decreases with increasing workpiece
feed speed or grinding depth. The wheel speed has the highest influence on the fatigue life
followed by workpiece feed speed and grinding depth. As surface roughness R a increased from 0.44μm to 0.94μm
the fatigue life decreased about 87.1% from 9.69×10
6
to 1.25×10
6
indicating that the grinding surface roughness has a significant influence on fatigue life. By optimization of grinding parameters
a group of suitable grinding parameters could be given as: wheel speed v