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In order to study the fractal features of the tool profile of worn surface and cutting force during the process of
cutting hard brittle materials such as ceramics, the milling experiments of ZrO2 were carried out. The images of worn
surface and cutting force were collected and preprocessed with digital image processing technology and phase space
reconstruction method. Then the fractal dimensions were calculated and the change regularity was analyzed. The research
findings show that the fractal dimension of worn surface is affected by wear rates and machining time, and can be
different while the wear loss is same. The fractal dimension of cutting force oscillates with a high-low-high general trend.