Effect of electrode materials on the surface quality of aero-engine honeycomb ring with short arc grinding

SEAM grinding of aero-engine honeycomb ring is a new machining method for aerospace disk ring parts. In view of the characteristics of low stiffness and thin wall of such parts, Seam grinding is adopted to achieve high precision, high efficiency and high quality machining requirements. Because the electrode with different materials will produce different machining effects, in order to study its performance, the short arc grinding test of aero-engine honeycomb ring was carried out by using cast iron, copper, brass and graphite. The thickness of recast layer, surface roughness (Ra), surface morphology (SEM), machining surface elements, machining current waveform and electrode loss ratio (TWR) were analyzed. The results show that the recast layer thickness of cast iron electrode after discharge grinding is the lowest, and there is no micro-crack on the surface, while the recast layer thickness of graphite electrode is the largest, and the TWR of graphite electrode is the highest, which affects the machining accuracy, so it is not suitable for short arc grinding of such parts. The discharge is stable and the electrolytic current is the largest during the processing of copper electrode.If the idling time is prolonged, electrolytic reaction can be effectively generated to remove the recast layer.