| All kinds of underground engineering in the city such as subway, city municipalpipelines and hydraulic tunnel and nationwide railway tunnel, highway tunnel,construction of these projects need a lot of tunnel boring machines (TBM). TBM hobis a tool to cut rock and it is easy to wear and tear. So it has a big consumption in theengineering. Its performance directly affects the construction and engineering cost.At present, the research on the load conditions during hob cutting rock and thematerial performance of disc cutter blade are relatively few. Therefore, developingfurther research on the TBM disc cutter cutting rock mechanism and the cutter bladematerial performance has great meaning for the manufacturing of the disc cutter withlarge diameter, long life and high performance. And also benefit for reducing therelying on the import disc cutter tool and reducing the engineering cost.Firstly, TBM disc cutter structure, material and its application are analyzed inthis thesis. Secondly, the dynamic simulation and analysis of TBM hob cutting rockprocess when the epitaxial compressive strength of rock is45MPa are simulated byusing ANSYS/LS-DYNA. The reliability of the simulation results are verified bytheoretical calculation and experimental data. The effect of cutting parameters suchas disc rotation speed and cutting depth of hob effects on the hob cutting load arestudied. The rational cutting speed and penetration when cutting the rock with45MPa epitaxial compressive strength are obtained. In addition, the distribution ofmaterial microstructure and hardness of the existing homesick disc cutter are studiedin this paper. The results show that, the average hardness of cutter blade was49HRC,while the hardness of high performance import disc cutter is54-56HRC, themaximum value can reach63HRC. The weakness and the suggestions forimprovement of disc cutter blade are developed by means of microstructure analysis. |
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