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

Jiang Hongxiang,Gao Kuidong,Liu Songyong,Du Changlong

doi:10.3221/igf-esis.27.06

Jiang Hongxiang, Gao Kuidong + Show 2 more

Open Access

https://doi.org/10.3221/igf-esis.27.06

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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.

Highlights

I n tunneling and mining, interaction between cutting mechanism and rock realizes rock fragmentation
Viewing the references mentioned above, we find that: Compared with experimental date, the result calculated by current theoretical model exists a notable divergence; For the limitation of experimental date, application of empirical models is limited to a specific scope; Experimental method and numerical simulation method can obtain proper cutting force, but some disadvantages exist such as high cost and low efficiency
I n this paper, a theoretical model for predicting the peak cutting force has been set up and verified, we get following conclusions: (1) The theoretical model of rock vertical fracture has been established by maximum tensile criterion and verified through experiments

Summary

Introduction

I n tunneling and mining, interaction between cutting mechanism (shearer drum and cutting head) and rock realizes rock fragmentation. The vertical fracture mechanics model of rock cutting fragment is established based on the maximum tensile criterion and rock cutting theory in this paper firstly; the theoretical model for predicting the PCF of conical pick is

Results

Conclusion