A theoretical model for predicting the Peak Cutting Force of conical picks

Gao Kuidong, Du Changlong, Jiang Hongxiang, Liu Songyong

Abstract


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


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DOI: http://dx.doi.org/10.3221%2FIGF-ESIS.27.06