In order to predict the PCF (Peak Cutting Force) of conical pick in rock cutting process, atheoretical model is established based on elastic fracture mechanics theory. The vertical fracture model of rockcutting fragment is also established based on the maximum tensile criterion. The relation between verticalfracture angle and associated parameters (cutting parameter n and ratio B of rock compressive strength totensile strength) is obtained by numerical analysis method and polynomial regression method, and thecorrectness of rock vertical fracture model is verified through experiments. Linear regression coefficientbetween the PCF of prediction and experiments is 0.81, and significance level less than 0.05 shows that themodel for predicting the PCF is correct and reliable. A comparative analysis between the PCF obtained fromthis model and Evans model reveals that the result of this prediction model is more reliable and accurate. Theresults of this work could provide some guidance for studying the rock cutting theory of conical pick anddesigning the cutting mechanism.
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