The deep hole processing of SiC

P

/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 SiC

P

/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.