The Edge Angle Design of the Disc Cutter of Tunnel Boring Machine
The edge angle design of the disc cutter of tunnel boring machine is based on the indentation test of the inner edge.The overall structure of the disc cutter is symmetrical to the blade plane.This kind of design has some practical defects,there will be partial wear and sideslip phenomenon.In this paper,3D software is used to model the cutter with asymmetric edge,and the geometric structure of the disc cutter of tunnel boring machine is designed and analyzed.The present design theory of edge angle is analyzed,the advantages of different edge angles in rock breaking process are studied,and the phenomenon of off-wear and sideslip failure is verified by experiments.In different geological conditions,the experimental data were compared with the theoretical data,and the cutters with different edge angles were compared and analyzed under normal installation.The wear of the symmetrical disc cutter is greater than that of the asymmetric disc cutter with the same installation position,and the wear of the cutters with different edge angles varies under different geological conditions,so the disc cutters with suitable edge angles should be designed according to different geological conditions.
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