## 1 Introduction
Applying it to the machining experiment platform of force signal feedback control of feed effectively improved the overcutting phenomenon on both sides of the micro-groove during ECDM. When ECDM micro-drilling electrical insulating glass materials, micro-cracks caused by electrochemical discharge were found on the machined surface [13; 14; 15] and the heat-affected zone was observed near the machined surface [16]. [PERSON] et al. [17] used the TOPSIS method to optimize the process parameters of ECDM, improve the overcutting phenomenon of processed samples, and improve the surface quality of processed samples, but there were still micro-cracks on the surface of the samples. In conclusion, high spark discharge temperature usually has a negative impact on the machined surface. Therefore, it is necessary to analyze the surface quality of Al2O3 ceramic in diamond wire sawing combined with oil film-assisted ECDM. The integration of oil film-assisted ECDM will also bring changes to the wear of the diamond wire. In recent years, electrochemical machining technology has become a potential competitor in the processing of non-conductive hard and brittle materials, but due to the presence of abrasive particles, the conventional processing of these materials will lead to high tool wear [18]. [PERSON] [19] analyzed tool wear during EDM of conductive Al2O3 composites. In the process of EDM, the wear rate of electrode increases with the increase of applied current and voltage. [PERSON] et al. [20] found that lower electrolyte concentrations reduced overcutting by 22%, as well as tool wear and hole taper by 39% and 18%, respectively. [PERSON] et al. [21] found that nickel plating on cutting tools can reduce the average overcut and heat-affected zone width, and also improve the overall roundness of machining micro-holes. [PERSON] et al. [22] analyzed the influence mechanism of machining parameters on tool wear in the non-machining state and obtained the voltage range suitable for machining. Based on the current signal, it was found that the local material of the cathode melted or vaporized at high temperature, and this loss behavior may shorten the film forming time, but has little effect on the average spark discharge current. [PERSON] [23] measured the external profile of the tool electrode using the contact method and found that negative polarity machining, high polarity voltage, small peak current, large gain, high frequency pulse and long pulse width can reduce wear on the length direction of the tool electrode. In Japan, a thin metal mesh was pressed on the wafer workpiece as an auxiliary electrode for processing non-conductive ceramic materials. The vaporization,spraying or sputtering of metal materials was used to make the surface of ceramic parts conductive, so that the processing could be sustained. However, the processing depth of this method was relatively shallow [24; 25; 26]. Experimental investigations were carried out on the performance of electrochemical discharge in machining glass-epoxy and Kevlar-epoxy composites [27]. The results show that the tool wear increases with the increase of voltage. These research studies support that the spark discharges have an influence on tool wear. Therefore, the research on tool wear in diamond wire sawing combined with oil film-assisted ECDM is necessary. In this research, we conducted a series of experiments to analyze the surface quality of Al\({}_{2}\)O\({}_{3}\) ceramic and tool wear in diamond wire sawing combined with oil film-assisted ECDM. Surface roughness and topography, recast layer and elements of the machined Al\({}_{2}\)O\({}_{3}\) ceramic were investigated. The surface topography of used diamond wire was observed to analyze the wear of diamond wire.