Dynamic Simulation and Thermal Analysis of Rock Breaking Force on Disc Cutter of Tunnel Boring Machine

The disc hob is a key component of the roadheader and its stress is complicated during the rock breaking process. In this paper, the finite element simulation analysis is carried out based on the external and internal actual force conditions of the disc hob. The research shows the rock breaking force of the hob is changing at any time. Through the thermal simulation during the rock-breaking process of the disc hob, it is found the thermal stress change trend is basically consistent with the temperature change trend. The value of the tool tip area is the largest and the value of the area farther from the tool tip is smaller. Through the comprehensive simulation analysis from different angles, it provides a certain basis for optimizing the structure of the disc hob, reducing the abnormal damage probability of the hob and prolonging the service life of the hob.