TBM大直径盘形滚刀破岩仿真及刀圈材料性能的研究
发布时间：2018-07-13 15:06
【摘要】：城市的各种地下工程比如城市地铁、市政管道和水工隧道等还有全国范围内的铁路隧道、公路隧道等，这些工程的施工需要大量的隧道掘进机（TBM）。盘形滚刀是TBM切削岩石的刀具，属于易损耗件，在工程中消耗量很大，它的性能直接影响到工程的工期和工程造价。而国内对TBM滚刀切削岩石的载荷状况以及刀圈的材料与机械性能方面的研究相对较少。因此，深入研究TBM盘形滚刀破岩机理及刀圈材料性能对研制大直径、长寿命、高性能的滚刀，减少对TBM刀具的依赖及降低工程成本均有重要的现实意义。 本文首先分析了TBM盘形滚刀的结构、材料及其适用范围。然后采用ANSYS/LS-DYNA对TBM滚刀滚削岩石的过程进行动态模拟和动力学分析，得到了岩石单轴抗压强度为45MPa时滚刀承受的切削载荷，通过与理论计算结果及实验数据的对比，验证了该仿真结果的可靠性。仿真研究了切削深度、滚刀转动速度等切削参数对滚刀切削载荷的影响规律，得到在岩石单轴抗压强度为45MPa时的最佳切削速度及贯入度，为工程人员在较软围岩介质的工况下设计工作参数提供了合理依据。另外，本文试验研究了现有国产刀圈的材料、金相组织及刀圈硬度的分布规律。结果表明，刀圈的平均硬度为49HRC，而国外高性能刀圈的硬度为54-56HRC，，最高能达到63HRC，通过对刀圈组织的金相分析指出了刀圈性能的不足之处并提出改进建议。
[Abstract]:Various underground projects such as urban subway, municipal pipelines and hydraulic tunnels, as well as national railway tunnels, highway tunnels and so on, require a large number of tunneling machines (TBM). Disc hob is a kind of cutting tool for cutting rock by TBM, which is easy to wear out and consumes a lot in the project. Its performance has a direct impact on the construction period and the cost of the project. However, there are few researches on the load state of TBM hob cutting rock and the material and mechanical properties of the cutter ring in China. Therefore, it is of great practical significance to study the rock breaking mechanism of TBM disc hob and the material performance of the cutter ring for the development of large diameter, long life, high performance hob, reduce the dependence on TBM tool and reduce the engineering cost. In this paper, the structure, material and application range of TBM disc hob are analyzed. Then the dynamic simulation and dynamic analysis of rock hobbing process of TBM hob are carried out by using ANSYS- LS-DYNA. The cutting load of rock hob is obtained when the uniaxial compressive strength of rock is 45 MPA. The results are compared with the theoretical calculation results and experimental data. The reliability of the simulation results is verified. The influence of cutting parameters such as cutting depth and turning speed of hob on the cutting load of hob is studied by simulation. The optimum cutting speed and penetration are obtained when the uniaxial compressive strength of rock is 45 MPA. It provides a reasonable basis for engineers to design working parameters under the condition of soft surrounding rock medium. In addition, the distribution of the material, metallographic structure and the hardness of the existing domestic cutter rings are studied experimentally in this paper. The results show that the average hardness of the cutter ring is 49HRC, while the hardness of the high performance ring is 54-56HRC, the highest can reach 63HRC. Through the metallographic analysis of the cutter ring structure, the shortcomings of the cutter ring performance are pointed out and suggestions for improvement are put forward.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.3
本文编号：2119814
[Abstract]:Various underground projects such as urban subway, municipal pipelines and hydraulic tunnels, as well as national railway tunnels, highway tunnels and so on, require a large number of tunneling machines (TBM). Disc hob is a kind of cutting tool for cutting rock by TBM, which is easy to wear out and consumes a lot in the project. Its performance has a direct impact on the construction period and the cost of the project. However, there are few researches on the load state of TBM hob cutting rock and the material and mechanical properties of the cutter ring in China. Therefore, it is of great practical significance to study the rock breaking mechanism of TBM disc hob and the material performance of the cutter ring for the development of large diameter, long life, high performance hob, reduce the dependence on TBM tool and reduce the engineering cost. In this paper, the structure, material and application range of TBM disc hob are analyzed. Then the dynamic simulation and dynamic analysis of rock hobbing process of TBM hob are carried out by using ANSYS- LS-DYNA. The cutting load of rock hob is obtained when the uniaxial compressive strength of rock is 45 MPA. The results are compared with the theoretical calculation results and experimental data. The reliability of the simulation results is verified. The influence of cutting parameters such as cutting depth and turning speed of hob on the cutting load of hob is studied by simulation. The optimum cutting speed and penetration are obtained when the uniaxial compressive strength of rock is 45 MPA. It provides a reasonable basis for engineers to design working parameters under the condition of soft surrounding rock medium. In addition, the distribution of the material, metallographic structure and the hardness of the existing domestic cutter rings are studied experimentally in this paper. The results show that the average hardness of the cutter ring is 49HRC, while the hardness of the high performance ring is 54-56HRC, the highest can reach 63HRC. Through the metallographic analysis of the cutter ring structure, the shortcomings of the cutter ring performance are pointed out and suggestions for improvement are put forward.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.3
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