电解-磁力复合研磨镍基高温合金实验研究

The Experimental Research on Electrolytic-magnetic Composite Grinding of Nickel-based Superalloy

为了改善镍基高温合金GH4169制造零部件的表面质量,降低其表面粗糙度,提出了一种高效率的电解-磁力复合研磨光整加工方法。设计了电解-磁力复合研磨光整加工的试验装置,与单纯磁力加工对比,对不同加工工艺下所得合金表面的表面粗糙度、表面成分、表面残余应力进行分析。结果表明,在同等条件下,复合研磨使表面粗糙度由Ra 6.3μm降至Ra 0.8μm,完善了表面质量且加工效率提高56%;加工后表面成分无太大变化;使表面残余应力由+215 MPa转变为-186 MPa,从而获得更好的表面应力状态。

In order to improve the surface quality and reduce the surface roughness of the parts made of nickel-based snperalloy（ GH4169）, an efficient electrolytic-magnetic composite grinding method was pro- posed. A test device of electrolytic-magnetic composite grinding was designed. The surface roughness, surface composition and surface residual stress of the parts under different processing were analyzed by com- paring with the simple magnetic processing. Results showed that under the same condition, surface roughness of the parts after composite grinding was reduced from Ra 6.3 μm to Ra 0.8 μm, the surface quality was obviously improved and the processing efficiency was increased by 56% ,the surface composition did not change much after processing, the surface residual stress was converted from ＋ 215MPa to -186 MPa, resulting in a better status of surface stress.