巨电流变抛光液性能分析与抛光实验研究

发布时间：2018-03-22 06:25

本文选题：巨电流变效应　切入点：流变性能　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：巨电流变抛光液是由高介电常数的纳米颗粒、二甲基硅油以及磨料颗粒混合而成的绝缘悬浮液。在外加电场的作用下会产生巨电流变效应，巨电流变抛光液中的固相颗粒在极化力的作用下会沿着电场线的方向形成链状结构，，使得抛光液的粘度和剪切屈服应力有显著的增长。巨电流变抛光技术正是应用巨电流变抛光液在电场作用下这一特殊性质来对工件表面进行加工的一种非接触式抛光方法，对于导体和非导体工件均适用。对巨电流变抛光液微观结构的观察有助于了解在外加电场作用下巨电流变抛光液中固相颗粒的运动及成链情况，并能够更好的理解巨电流变效应的机理。通过观察发现，与电流变效应相比，巨电流变效应所产生的链状结构纤维更加细密，效应更加明显。这也是巨电流变液的剪切屈服强度能达到普通电流变液剪切屈服强度十倍以上的原因。巨电流变抛光液的流变学性能对巨电流变抛光工艺来说是一个非常重要的影响因素。而衡量巨电流变抛光液流变性能的两个主要因素是其在外电场作用下的表观粘度及剪切屈服应力值。本文中使用自制的圆筒式旋转流变仪从磨料的种类、磨料的粒度、磨料的浓度等不同影响因素的角度对巨电流变抛光液的粘度及剪切屈服应力进行实验研究，找出不同影响因素对巨电流变抛光液流变性能的影响，并得出相应的结论，同时也为巨电流变抛光实验提供充足的理论依据。区别于传统抛光实验中所使用的针状电极，本次实验中的五轴联动巨电流变抛光机床使用的是可拆式集成环状电极抛光工具。通过对外加电场作用下集成环状抛光工具进行电场强度仿真和对抛光工具前端所形成的巨电流变柔性抛光头有效抛光区域实验，验证了该集成环状抛光工具可被用于巨电流变抛光实验中。本文中使用五轴联动巨电流变抛光机床对光学玻璃进行了一系列巨电流变抛光实验,探究了磨料的种类、浓度、粒度，以及抛光电压、抛光间隙、抛光时间、电机转速等多个因素对巨电流变抛光工件表面粗糙度的影响，并找出了各自的变化规律，得到了抛光光学玻璃合理的工艺参数。应用这些经过优化后的参数进行巨电流变抛光实验，得到了满意的实验结果。
[Abstract]:Giant electrorheological polishing fluid is an insulating suspension composed of high dielectric constant nanoparticles, dimethyl silicon oil and abrasive particles. Under the action of an external electric field, a giant electrorheological effect is produced. The solid particles in the giant electrorheological polishing liquid will form chain structure along the direction of the electric field line under the action of polarization force. The viscosity and shear yield stress of the polishing fluid have been greatly increased. The giant electrorheological polishing technology is a non-contact polishing method which uses the special property of giant electrorheological polishing fluid under the action of electric field to process the workpiece surface. Applicable to both conductor and non-conductor workpiece. The observation of the microstructure of the giant electrorheological polishing liquid is helpful to understand the motion and chain formation of solid particles in the giant electrorheological polishing liquid under the action of an applied electric field, and to better understand the mechanism of the giant electrorheological effect. Compared with the electrorheological effect, the chain structure fiber produced by the giant electrorheological effect is finer and the effect is more obvious, which is the reason why the shear yield strength of the giant electrorheological fluid is more than ten times that of the common ER fluid. The rheological properties of giant electrorheological polishing fluids are a very important factor in the polishing process of giant electrorheological fluids, and the two main factors to measure the rheological properties of giant electrorheological polishing fluids are the external electric field. Apparent viscosity and shear yield stress. In this paper, the self-made cylindrical rotary rheometer is used from the type of abrasive, The viscosity and shear yield stress of giant electrorheological polishing fluid were experimentally studied from the angle of different influencing factors such as abrasive particle size and abrasive concentration, and the effects of different factors on rheological properties of giant electrorheological polishing fluid were found out. At the same time, it provides sufficient theoretical basis for the experiment of giant electrorheological polishing. Different from the needle electrodes used in traditional polishing experiments, The five-axis linkage giant electrorheological polishing machine tool is a detachable integrated annular electrode polishing tool. The electric field intensity simulation and the front end of the polishing tool are carried out for the integrated ring polishing tool under the action of external electric field. Experimental study on the effective polishing area of the large electrorheological flexible polishing head, It is verified that the integrated annular polishing tool can be used in the experiment of giant electrorheological polishing. In this paper, a series of experiments of giant electrorheological polishing of optical glass are carried out by using a five-axis linkage giant electrorheological polishing machine. The types, concentration, particle size, polishing voltage, polishing gap and polishing time of abrasive are investigated. The influence of many factors, such as motor speed, on the surface roughness of the workpiece polished by giant electrorheological change was found out. Reasonable process parameters of polished optical glass are obtained, and the optimized parameters are applied to the experiment of giant electrorheological polishing, and satisfactory experimental results are obtained.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG580.692

【参考文献】