硬岩地质下镶齿滚刀齿形对破岩性能影响研究

Study on the influence of tooth profile of insert hob on rock breaking performance inhard rock geology

为了降低镶齿滚刀的破岩比能耗和刀齿接触面应力,提高镶齿滚刀在硬岩地质下的破岩效率和使用寿命,采用LS-DYNA建立显示动力学仿真模型,并通过实验验证模型的可靠性。仿真分析镶齿滚刀的破岩机理及不同齿形的破岩效率,确定较优的齿形。通过正交试验法,分析齿宽、齿高、齿顶半径和齿数对破岩效率以及接触面应力值的影响,确定齿形参数对破岩性能影响权重。研究结果表明:在118 MPa硬岩地质下,镐齿滚刀的破岩效率最高,齿顶半径为破岩效率的最主要影响因素,权重达到50%,齿数与齿顶高为接触面应力值的主要影响因素,权重分别占31%、36%。齿形最优参数组合是齿宽为11 mm、齿顶高为1 mm、齿顶半径为10 mm、齿数为36个。该研究对于镶齿滚刀的齿形选择及参数优化具有参考价值。

In order to reduce the energy consumption ratio of rock-breaking and the stress of contact surface of insert hob,and improve the rock-breaking efficiency and service life of insert hob in hard rock geology,LSDYNA was used to establish the simulation model of display dynamics.The reliability of the model was verified by experiments.The rock breaking mechanism of insert gear hob and rock breaking efficiency of different tooth shape are analyzed by simulation,and the better tooth shape is determined.Through orthogonal test,the influences of tooth width,tooth height,tooth tip radius and tooth number on rock breaking efficiency and stress value of contact surface were analyzed.The influence weight of tooth shape parameters on rock breaking energy was determined.The results show that the rock breaking efficiency of tooth hob was highest under the hard rock geology of 118 MPa.The tooth tip radius was the most important factor affecting the rock breaking efficiency,and the weight reached 50%.The tooth number and tooth tip height were the main factors affecting the stress value of contact surface,and the weight accounted for 31%and 36%,respectively.The optimal combination of tooth profile parameters was that tooth width 11 mm,tooth tip height 1mm,tooth tip radius 10 mm,and the number of teeth was 36.The research is instructive for the tooth shape selection and parameter optimization of insert hob.