【作者】 王岩；

【导师】 高国富；

【作者基本信息】 河南理工大学 ， 机械工程， 2015， 硕士

【摘要】 复合氧化铝陶瓷由于其本身耐腐蚀、耐磨损、高强度等优越的性能被广泛的应用于工业领域的各个方面。由于矿井下恶劣的工作条件,陶瓷托辊产品具有较强的竞争力。陶瓷托辊耐磨损、耐酸碱、不产生静电,轴承密封好,润滑油无泄露现象,外界的灰尘不易侵入轴承。该产品无需润滑保养、维修,使用寿命比钢管托辊可提高数倍以上,可显著地降低使用成本。但是由于陶瓷材料的脆硬特性加工较困难,由此本文引入超声复合磁力研磨加工技术。本文综述了国内外学者对磁力研磨加工技术磨料、装置、加工机理等方面的研究。针对磁力研磨加工技术加工效率低的缺点,着重研究了超声复合磁力研磨的加工机理、磨料配比、加工参数。首先,从磁性材料在无方向磁场中被磁化的特性切入,对磁场中的单个磁性磨粒进行了动力学分析并在此基础上分析在超声辅助下,振动对磁性磨料施加的力以及对工件表面的作用情况得出超声辅助磁力研磨加工技术的加工机理。结论是超声振动对磁力研磨的加工效果具有加强作用。建立超声辅助磁力研磨加工技术的材料去除模型,得出超声磁力研磨加工材料去除量公式,其次,首次在磁力研磨过程中考虑到超声空化对加工效果的影响:从液体的粘滞性、环境因素、超声的参数等方面分析了超声空化的相关特性,根据超声空化的发生条件选用合适的结合剂和磨料配比。将空化作用于无粘结磨料的性质结合起来分析了超声空化所释放的热量、空泡崩坏产生的冲击力等对工件表面的影响。本文针对超声辅助磁力研磨的主轴转速、加工间隙、超声频率、磨料粒度等加工参数进行了实验研究。通过控制变量的方法进行对比实验,实验表明主轴转速过大时磨料容易飞出加工区域,转速过小时加工效果不明显;当加工间隙过大时研磨压力过小,过小时磨料刷会破坏工件表面状态;同时磨料粒度也是加工实验的主要影响因素,既不能过小也不能过大。更多还原

【Abstract】 The composite alumina ceramics are applied to many kinds of aspect in industrial sectors because of its superior performances of endurance of corrosion, abrasion and high strength. Due to the mine’s bad work conditions, the products of Ceramic roller have strength competitiveness. Ceramic roller have the ability of resistance abrase, acid and alkali and don’t have electrostatic seal well, lubricating oil isn’t come to light and the dust in the outside couldn’t intrusion the bearings easily. It doesn’t need any lubricating oil to maintenance and repaint, life are improve several times than steel roller that reduce the cost significantly. But the ceramics are hard to processing because of the vulnerability thus lead to the technology of ultrasonic assisted magnetic abrasive finishing(UMAF).This essay review the kinds of scholars’ research at magnetic abrasive particle(MAP), magnetic abrasive finishing device, finishing mechanism, for the downsides of the efficiency of magnetic abrasive finishing, focus on the ultrasonic assisted magnetic abrasive finishing mechanism and the processing parameters. Firstly, from the direction of magnetic material in the absence filed are magnetized, make the dynamic analysis of a single magnetic abrasive under the magnetic filed. Based on this analysis vibration force on magnetic abrasive’s strength and the function of the workpiece surface to get the knowledge of processing mechanism of UMAP under the ultrasonic helps. Secondly, for the first time considering the influence of ultrasonic cavitation to processing effect during the process of magnetic abrasive, from the viscosity of the liquid, environmental factors and ultrasonic parameters to analysis the related characteristics. According the ultrasonic cavitation’s conditions, select the fitable agent and abrasive ratio.,Make the connect cavitation with the nature of unbonded abrasives to realize the influence of the heat by the ultrasonic cavitation and the impact of the cavitation bubble’s collapseThe article makes focus on the UMAP Spindle speed, working gap, ultrasonic frequency and abrasive size’s parameters argnments to make a deliberation. By the method of control variables to make contrast experiments, the result shows that the spindle speed greater than abrasive, is easy to fly out of the processing area, if the speed is slowly, the processing effects are not obvious. When the working gap is too large to grinding pressure is too small, thus abrasive bush would destroy the workpiece surface. At the same time, abrasive size is also the main factors in machining experiment neither too big nor too small.更多还原