Luo Zhaoyang, Wu Chunya, Jin Ziyuan, Guo Bing, Gao Shengdong, Luo Kailei, Liu Huiyong, Chen Mingjun
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.
Micromachines (Basel). 2025 Jun 29;16(7):763. doi: 10.3390/mi16070763.
316L stainless steel slender tubes with smooth inner surfaces play an important role in fields such as aerospace and medical testing. In order to solve the challenge of difficult machining of their inner surfaces, this paper introduces a novel rotary magnetorheological finishing (RMRF) method specifically designed for processing the inner surfaces of slender tubes. This method does not require frequent replacement of the polishing medium during the processing, which helps to simplify the processing technology. By combining the rotational motion of a magnetic field with the linear reciprocating movement of the workpiece, uniform material removal on the inner surfaces of 316L stainless steel tubes was achieved. Initially, a finite element model coupling the magnetic and flow fields was developed to investigate the flow behavior of the MPF under a rotating magnetic field, to examine the theoretical feasibility of the proposed polishing principle. Subsequently, experimental validation was performed using a custom-designed polishing apparatus. Through processing experiments, with surface quality designated as the index, the influences of key parameters such as the volume content and sizes of carbonyl iron particles and abrasive particles in the MPF were comprehensively evaluated, and the composition and ratio of the MPF were optimized. Based on the optimized formulation, the optimal processing time was established, reducing the inner surface roughness from an initial Sa of approximately 320 nm to 28 nm, and effectively eliminating the original defects.
内表面光滑的316L不锈钢细长管在航空航天和医学检测等领域发挥着重要作用。为了解决其内表面加工困难的挑战，本文介绍了一种专门用于加工细长管内表面的新型旋转磁流变抛光（RMRF）方法。该方法在加工过程中无需频繁更换抛光介质，有助于简化加工工艺。通过将磁场的旋转运动与工件的直线往复运动相结合，实现了316L不锈钢管内表面的均匀材料去除。首先，建立了一个耦合磁场和流场的有限元模型，以研究磁流变抛光液在旋转磁场下的流动行为，检验所提出的抛光原理的理论可行性。随后，使用定制设计的抛光设备进行了实验验证。通过加工实验，以表面质量为指标，综合评估了磁流变抛光液中羰基铁颗粒和磨料颗粒的体积含量和尺寸等关键参数的影响，并对磁流变抛光液的成分和比例进行了优化。基于优化后的配方，确定了最佳加工时间，将内表面粗糙度从初始的约320nm降低到28nm，并有效消除了原始缺陷。
