螺线管磁场中磁流变液悬浮分析

MRF Suspension Analysis in Solenoid Magnetic Field

利用通电螺线管与铁心形成交变磁场,磁流变液中磁性颗粒在交变磁场中旋转,改变方向成链,在旋转过程中,非规则磁性颗粒对工件表面进行微切削。为了达到利用磁性颗粒对工件进行精密抛光的目的,需要形成磁流变缎带悬浮。设计新型结构,通过有限元方法对尖劈形磁场进行数值分析,分别给出了磁场强度和磁通密度随尖劈高度和螺线管宽度的变化规律。结果表明,尖劈结构优于无尖劈结构,随着尖劈高度的增加,磁场强度最大值逐渐减小,磁通量表现为先增加后降低,最大值位置发生变化;随着螺线管宽度的增加,磁通量最大值略有降低,但变化不大,其位置也是从铁心最低点变化到中间部位,磁场强度最大值先降低再升高,位置始终在尖劈处。以上研究结果为形成磁流体悬浮抛光的磁场设计提供了理论依据。

A Iternating magnetic field is formed by using energized solenoid and magnet core. Magnetic particles in MR rotate in alternating magnetic field and change the direction into a chain. Random magnetic particles is done with process micro cutting of workpiece surface in the process of rotation. It needs to form magnetorheological fluid suspensian in the ribbon shape to polish workpiece precisely by using magnetic particles. After numerical analysis of wedge-like magnetic field on the new structure design by finite element method, it shows the regulation of magnetic field intensity and magnetic .flux density changes with the change of the wedge height and the solenoid width. The results show the wedge structure is better than no wedge structure. With the increase of the wedge height, the maximum valne of magnetic flux gradually reduces. Its pegeormance is firstly increases and then decreases, and the maximum value cbanges. With the inease of the solenoid width, the maximum value of magnetic flux slightly reduces. It changes from the core low point to the centre position. The maximum value of magnetic flux firstly increases and then decrease.s, and the position is always in the wedge. The results provide a theoretical basis for the magnetic field design to form magnetorheological fluid suspension finishing.