截齿是采煤机的截割刀具，是采煤机直接工作的部分，由于其工作环境复杂恶劣，成为采煤机实际作业中更换量最大的易损件，其力学性能的好坏对生产效率和功率的消耗，以及提高经济效益具有十分重要的意义，针对截齿工作过程中受力及可能出现的故障，本文对采煤机截齿截割过程的力学性能进行了比较详细的模拟分析和研究。 本文在冲击动力学理论和显式积分算法的基础上，建立了截齿有限元动态特性分析的基本技术方案，并借助ANSYS/LS-DYNA软件，依据截齿尺寸以及实际工况情况，分别建立了截齿静力学、动力学的有限元模型，并通过对这些有限元模型静力学和动力学的模拟计算，得出了不同速度下截齿受冲击后速度、加速度的响应特性，截齿受力的分布规律、截面轮廓线处等应力变化以及能量变化特性，并分析了不同安装约束对截齿等效应力、速度、加速度以及能量的影响。 主要结论如下： (1) 静力学分析中，最大等效应力出现在刀头，越靠近刀头应力越大，但最大应变发生在刀头与刀杆焊接处，这是造成刀头脱落失效的重要原因。 (2) 动力学分析中，截齿应力值先增加后减小，且剪切应力起主要作用，在各横截面轮廓线处应力变化幅度较大，易疲劳失效。 (3) 速度大的截齿工作效率高，但所受应力、速度变化以及加速度变化均较大，易造成截齿破坏失效，因此，截齿作业中应选择适当速度。 (4) 安装牢固的截齿受力较小，且刀杆尾部应力变化幅度不大，动能损失较多，内能增加较少，有利于破煤，因此应避免存在空隙等缺陷。 本文工作和分析结果为截齿优化设计和进一步试验研究提供了一定的理依据。

Pick is a cutting tool of shearer, which is also the direct working part of shearer. because of the poor working environment, pick is also the main parts which have to be replaced often. The mechanical properties of pick play a significance important part for improving productive efficiency and economic efficiency. According to the force and possible fault in the operation, static load and dynamics of picks during the operation are detail analyzed and researched in the thesis. Based on the impact dynamics theory and analysis of explicit integration algorithms, the basic technical process of the pick dynamics by using finite element method (FEM) is established in the paper. By using ANSYS/LS-DYNA, the analysis model of static and dynamic analysis. The stress and strain distribution under static force of pick is obtained. The equivalent stress distribution, velocity, acceleration and energy characteristics of pick under impact dynamics condition, and the effect of the different install binding on the mechanical properties is especially compared. The main conclusions in this thesis are as followings: (1) The maximum equivalent stress of pick occurs is in the head in the static load,, and the closer to the head the stress is bigger, but the maximum strain is in the welded zone. Therefore, it is possibly failure reason of pick set that the head fall off. (2) It is easy to fatigue failure during the impact load, because stress is increased and decreased repeat. The shear stress plays a major role in this kinds loading. (3) The stress, velocity, acceleration transient is a larger under impact loading as the speed increase. So, the larger pick speed during operations is limited. (4) The stress is smaller in the head and changes are not obviously in the tail because of the pick which is installed strongly, kinetic energy loss more, and internal energy increase less. It’s good for cutting coal. The research results in this thesis provide a theoretical basis for the pick optimized design and experimental study.