Cutting mechanism study on cutting tool and leading tool of super large diameter shield

The cutting tool and leading tool are the primary cutting combinations when the super large diameter shield cutter head is excavated in the soft soil stratum. The cutter size, cutting parameters, and layout relationship will affect the tunneling efficiency of the cutter head. The explicit dynamics are used to simulate the cutting tool, the leading tool, and their combination. The effects of four factors, such as stratum, tool width, cutting depth, and cutting speed, on the cutting force and cutting efficiency of the cutting tool and the leading tool are studied through orthogonal test design. The research results indicate that the main factors affecting the cutting performance of cutting tools are the cutting speed and stratum. Reasonable leading tool layouts can reduce the fluctuation range of cutting force. When the leading tool path coincides with both sides of the cutting tool path, the cutter force can be significantly reduced, and the tool life can be prolonged. The research results can provide a reference for shield cutter group modeling and the layout of the cutting tool and leading tool.