Matching Behavior of Hardness of TBM Cutter Ring and Rock

In order to study the influence of matching behavior of TBM cutter ring hardness and rock properties on the wear volume and wear mechanism of TBM cutter ring, four cutter ring specimens of the same material but with different hardness were used to do matching wear test with the same kind typical granite rock specimen in TBM Engineering. The test results showed that: there were some differences in the microstructure of the four cutter ring specimens, hardness of cutter ring had a significant influence on the wear volume and wear mechanism of the cutter ring. With the increase of the hardness of the cutter rings, the wear volume of the cutter rings firstly decreased and then increased, the wear volume of the cutter ring with the highest hardness was maximum. When the hardness of cutter rings was low,? the wear mechanism of the rings was micro-cutting removal mainly, and within a certain range, with the increase of hardness of the cutter rings, the effect of micro-cutting got weaker, cutter ring showed better wear, but when the hardness of cutter ring exceeded a certain value, the wear removal mechanism of cutter ring turned to ductile fracture spalling mainly, wear of cutter ring got worse sharply.