新型摆动式球磨机动力学分析及速度控制策略研究

发布时间：2018-04-09 00:03

本文选题：摆动式球磨机　切入点：机械合金化　出处：《吉林大学》2012年硕士论文

【摘要】：摆动式高能球磨机是一种新型高能高效球磨机。本文从动力学分析和实验研究两个方面论证了摆动式球磨机高球磨效率的显著优点。应用齐次坐标变换理论、MATLAB编程、CATIA建模、RecurDyn动力学仿真软件进行了动力学分析，得出摆动式球磨机在空间做八字形运动轨迹的结论。这种复杂的空间八字形运动使球磨罐内的磨球产生多频率多强度的碰撞运动，进而使研磨粉体得到更充分快速的研磨。这就克服了以往球磨机平面行星式运动的缺点，使球磨机的运动由平面运动变为空间运动。对摆动式球磨机球磨能量进行了理论与实验分析，发现研磨粉体接近纳米级时产生粉体附着磨球表面致使球磨能量下降的问题。为了解决磨球的粘附现象，本文参考并借鉴行星式球磨机所采用的利用加速度产生的反作用力使粉体颗粒脱离磨球表面的方法。采用变频控制电动机转速使球磨机按照宏观正余弦的规律进行工作，有效避免了在脉冲式调速方式下，电动机频繁启动对电机冲击大的缺点，同时可以获得较高的球磨效率。机械合金化制备Ti_3AlC_2对比实验，，得出：摆动式球磨机球磨3h后，Ti、Al、C单质粉末的衍射峰消失，混合粉末发生化学反应生成以Ti_3AlC_2(特征峰为2θ＝9.5°)为主晶相，并含有少量TiC的混合粉体（Ti_3AlC_2的含量达到83%）。行星式球磨机在球磨3h后刚开始出现少量Ti_3AlC_2相，但其衍射峰宽度小，强度不高，实际上并没有产生大量Ti_3AlC_2相，且3h时C单质衍射峰还没有完全消失。实验说明摆动式球磨机比行星式球磨机具有更高的球磨效率。
[Abstract]:Swing high energy ball mill is a new type of high energy and high efficiency ball mill.In this paper, the remarkable advantages of high ball milling efficiency of swing ball mill are demonstrated from two aspects of dynamic analysis and experimental study.Based on the homogeneous coordinate transformation theory, the CATIA modeling software RecurDyn dynamics simulation software is used to analyze the dynamics, and the conclusion is drawn that the swing ball mill does the octahedral trajectory in space.The complex spatial octahedral motion causes the grinding ball in the ball mill tank to produce multi-frequency and multi-intensity collision motion, which makes the grinding powder more fully and quickly ground.This overcomes the shortcomings of the planar planetary motion of the ball mill in the past and changes the motion of the ball mill from the plane motion to the space motion.The theoretical and experimental analysis of ball milling energy of oscillating ball mill is carried out. It is found that when the grinding powder approaches the nanometer level, the ball milling energy decreases when the powder adheres to the ball surface.In order to solve the adhesion phenomenon of grinding ball, this paper refers to the method used by the planetary ball mill to use the reaction force produced by acceleration to make the powder off the surface of the grinding ball.The frequency conversion control of motor speed makes the ball mill work according to the law of macro sine cosine, which effectively avoids the disadvantages of frequent starting of motor to the motor under pulse speed regulation, and can obtain higher ball milling efficiency at the same time.The comparative experiment of Ti_3AlC_2 prepared by mechanical alloying shows that the diffraction peak of TiAL-C simple powder disappears after milling for 3 h, and Ti3AlC-2 (characteristic peak is 2 胃 ~ 9.5 掳) is the main crystal phase formed by chemical reaction of mixed powder, and the main phase is Ti3AlC2 (characteristic peak is 2 胃 ~ (9.5 掳)).The content of TiS _ 3AlC _ 2 mixed powder containing a small amount of TiC is 83%.A small amount of Ti_3AlC_2 phase appeared in the planetary ball mill only 3 h after milling, but the diffraction peak width was small and the intensity was not high. In fact, no large amount of Ti_3AlC_2 phase was produced, and the C single mass diffraction peak did not disappear completely at 3 h.The experiment shows that the swing ball mill has higher milling efficiency than the planetary ball mill.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TD453;TH113

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