Abstract：The deep hole processing of SiCP/2024Al composites was carried out by electrical discharge machining (EDM) process. The effects of different electrode cross-section shapes on processing performance such as material removal rate, machining stability and hole quality were studied. The results showed that the processing efficiency of EDM deep hole using spiral electrode was significantly higher than that of the cylindrical electrode under the same processing conditions. During the processing of the cylindrical electrode, the electro erosion debris accumulated in the electrode gap caused the tool electrode to retreat frequently, which greatly reduced the processing efficiency. Melting, vaporization and oxidation of electrode materials will occur during EDM of SiCP/2024Al composites. At the same time, thermal spalling of SiC particles will also occur. Micro-cracks were observed on the surface of EDM. During the process of EDM, the quenching process from high temperature to low temperature caused thermal stress in the composite material. When the stress exceeded the strength limit of the material, the stress will be released by the plastic deformation of the material, resulting in micro-cracks.
2020, 
