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针对小口径、高陡度光学元件的特点,设计了抛光轮直径为20 mm并运用永磁体作为磁场发生器的磁流变抛光装置.首先根据静磁场基本理论对磁场分布进行计算和仿真,以此为基础对抛光装置进行了详细设计;然后根据装置结构和磁场分布特点,以及流体流动过程中流速与喷管半径之间的关系完成喷管等关键部件的优化;最后提出了双层喷管设计实现屏蔽干扰磁场的方法.实验结果表明,所设计的装置能够实现磁流变液的稳定循环,并获得稳定的去除函数.为确定该装置的材料去除能力,使用K9玻璃进行了工艺实验,确定了K9光学元件的峰值去除效率为4.2μm/min.
According to the characteristics of small aperture and high steepness optical element, a magnetorheological polishing device with polishing wheel diameter of 20 mm and permanent magnet as magnetic field generator is designed.Firstly, the magnetic field distribution is calculated and simulated according to the basic theory of static magnetic field Based on this, the polishing device was designed in detail. Then the optimization of the key components such as the nozzle was completed according to the structure of the device and the distribution of the magnetic field, and the relationship between the flow velocity and the radius of the nozzle during the fluid flow. Finally, The method of shielding the magnetic field is designed and realized.The experimental results show that the designed device can achieve a stable circulation of MR fluid and obtain a stable removal function.To determine the material removal capability of the device, K9 glass was used to carry out the process experiment, The peak removal efficiency of K9 optical element was determined to be 4.2 μm / min.