【摘要】：城市的各種地下工程比如城市地鐵、市政管道和水工隧道等還有全國(guó)范圍內(nèi)的鐵路隧道、公路隧道等，這些工程的施工需要大量的隧道掘進(jìn)機(jī)（TBM）。盤形滾刀是TBM切削巖石的刀具，屬于易損耗件，在工程中消耗量很大，它的性能直接影響到工程的工期和工程造價(jià)。而國(guó)內(nèi)對(duì)TBM滾刀切削巖石的載荷狀況以及刀圈的材料與機(jī)械性能方面的研究相對(duì)較少。因此，深入研究TBM盤形滾刀破巖機(jī)理及刀圈材料性能對(duì)研制大直徑、長(zhǎng)壽命、高性能的滾刀，減少對(duì)TBM刀具的依賴及降低工程成本均有重要的現(xiàn)實(shí)意義。 本文首先分析了TBM盤形滾刀的結(jié)構(gòu)、材料及其適用范圍。然后采用ANSYS/LS-DYNA對(duì)TBM滾刀滾削巖石的過(guò)程進(jìn)行動(dòng)態(tài)模擬和動(dòng)力學(xué)分析，得到了巖石單軸抗壓強(qiáng)度為45MPa時(shí)滾刀承受的切削載荷，通過(guò)與理論計(jì)算結(jié)果及實(shí)驗(yàn)數(shù)據(jù)的對(duì)比，驗(yàn)證了該仿真結(jié)果的可靠性。仿真研究了切削深度、滾刀轉(zhuǎn)動(dòng)速度等切削參數(shù)對(duì)滾刀切削載荷的影響規(guī)律，得到在巖石單軸抗壓強(qiáng)度為45MPa時(shí)的最佳切削速度及貫入度，為工程人員在較軟圍巖介質(zhì)的工況下設(shè)計(jì)工作參數(shù)提供了合理依據(jù)。另外，本文試驗(yàn)研究了現(xiàn)有國(guó)產(chǎn)刀圈的材料、金相組織及刀圈硬度的分布規(guī)律。結(jié)果表明，刀圈的平均硬度為49HRC，而國(guó)外高性能刀圈的硬度為54-56HRC，，最高能達(dá)到63HRC，通過(guò)對(duì)刀圈組織的金相分析指出了刀圈性能的不足之處并提出改進(jìn)建議。
[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.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.3

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本文編號(hào)：2119814