不同齿形的镶齿滚刀破岩效果模拟仿真

发布时间：2018-10-23 16:38

【摘要】：反井钻机施工方法自20世纪70年代进入我国起,已在煤矿、水电、交通等行业工程建设中得到广泛应用。镶齿滚刀作为反井钻机的关键性部件和易损耗部件,其破岩效果直接影响着钻机的钻进效率和开挖成本,因此对其性能及合理布置进行探讨显得尤为重要。本文利用有限元软件,模拟了4种(球齿、锥齿、镐齿1、镐齿2)齿形的单齿压入岩石过程和镶齿滚刀滚压破岩动态过程,主要研究内容及结论如下:1、模拟了单齿压入岩石的过程,分析了岩石应力以及不同网格尺寸下对模拟结果的影响,研究了各单齿在不同压力下的破岩效果。结果表明:(1)侵深和破岩体积均随压力增加呈非线性增大。(2)镐齿的破岩效果最好,锥形齿的破岩效果次之,球齿的破岩效果最差。2、模拟了镶齿滚刀滚压破岩的过程,分析了滚刀受力、岩石应力情况以及岩石模型尺寸对模拟结果的影响,研究了岩石抗压强度、切深、锥齿齿形、刀齿间距以及刀齿排距对滚刀破岩效果的影响。结果表明:(1)岩石抗压强度越高,破岩比能越高,破岩越困难。(2)岩石的破岩比能随切深增加,先减少后增大,存在临界切深,此时破岩比能最小。(3)相同切深下,锥齿滚刀的破岩效果比球齿滚刀好。(4)锥齿的锥顶半径R增大会导致滚刀力增大,破岩比能减小;锥顶角θ增大会导致滚刀力增大。(5)刀齿间距较大时,破岩比能变化较小,破岩比能总体随刀齿间距的减小而减小。(6)岩石的破岩比能随刀齿排距的增加,先减小,后增大。
[Abstract]:Since its entry into China in the 1970s, the construction method of anti-well drilling rig has been widely used in the construction of coal mine, hydropower, traffic and other industries. As the key part and the easy to wear part of the reverse drilling rig, the rock breaking effect has a direct impact on the drilling efficiency and excavation cost of the drilling rig, so it is very important to discuss its performance and reasonable arrangement. In this paper, four kinds of tooth shapes (ball tooth, cone tooth, pick tooth 1, pick tooth 2) are simulated by finite element software. The main research contents and conclusions are as follows: 1. The process of single tooth pressing into rock is simulated, the influence of rock stress and different mesh size on the simulation results is analyzed, and the rock breaking effect of each single tooth under different pressure is studied. The results are as follows: (1) the volume of penetration and rock breaking increase non-linear with the increase of pressure. (2) the rock breaking effect of pick tooth is the best, the rock breaking effect of cone tooth is the second, and the rock breaking effect of ball tooth is the worst. 2. In this paper, the influence of hob force, rock stress and rock model size on the simulation results is analyzed. The influence of rock compressive strength, cutting depth, conical tooth profile, cutter tooth spacing and cutter tooth spacing on the rock breaking effect of the hob is studied. The results show that: (1) the higher the compressive strength of rock, the higher the specific energy of rock breaking, and the more difficult rock breaking is. (2) the specific energy of rock breaking increases with the depth of cutting, decreases first and then increases, and there is a critical cutting depth. (3) under the same cutting depth, the specific energy of rock breaking is the lowest. The rock breaking effect of cone tooth hob is better than that of ball tooth hob. (4) the increase of cone top radius R will lead to the increase of hob force and the decrease of rock breaking specific energy, and the increase of cone top angle 胃 will lead to the increase of hob force. (5) when the tooth spacing of the cutter is larger, the rock breaking ratio energy changes slightly. As a whole, the specific energy of rock breaking decreases with the decrease of cutter tooth spacing. (6) the specific energy of rock breaking decreases first and then increases with the increase of tooth spacing.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD421.3

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