Abstract
Superalloys, titanium alloys, stainless steels, and other difficult-to-cut materials have been widely used in aerospace and military due to their unique physical and chemical properties. Compared with conventional EDM and mechanical milling methods, the electrical discharge assisted arc milling (EDAAM) method can achieve efficient and stable machining when processing these difficult-to-cut materials. The oil-based dielectric fluid, which is often used in conventional EDM, may cause environmental problems if not recycled. In order to improve the environmental performance and study the influence of dielectric fluids, this paper studies the effects of different dielectric fluids on the machining performance of EDAAM. Deionized water and different gases including air, oxygen, nitrogen, and argon were used as the dielectric fluid, graphite was used as tool electrode, and iron-based superalloy A286 (GH2132) was used as the workpiece. Machining performance, including material removal rate, relative electrode wear rate, machining error, and surface properties, including recast layer, surface morphology, and element distribution, were studied. The experimental results show that the combinations of different dielectrics play a vital role in the processing effect. The mixed flushing method of using deionized water and gas medium can ensure the machining efficiency and improve the surface quality of the workpiece.
Published Version
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