基于磁流变柔性辅助支撑铣削装置设计及磁场分析

Design and magnetic-field analysis of the flexible auxiliary support milling device based on magnetorheology

提高弱刚度、难夹持零件的加工精度,一直是学术界和工业界普遍关注的问题。文中设计了一种利用磁流变效应为弱刚度零件提供与其形状相适应的柔性支撑,以获得较高加工精度的装置。该装置所能提供的支撑力与其产生的磁感应强度密切相关,因此磁感应强度的大小是决定该柔性辅助支撑装置性能的关键因素。利用有限元方法,研究了励磁铁芯结构、线圈通电方式及加工工件材料对装置工作间隙处磁场的影响规律,对不同参数下产生的磁感应强度进行了仿真及试验验证。基于上述研究结果,对磁流变柔性辅助支撑装置的各项结构参数进行设计,磁路仿真结果表明,该装置工作间隙处磁感应强度符合设计要求,能够为提高加工精度提供所需的辅助支撑。

How to improve the processing accuracy of difficult-to-clamp parts with weak stiffness is a common concern in terms of academia and industry. In this article,a device is developed,which depends on the magnetorheological effect to provide a flexible support with a shape suitable for its weakly-rigid parts to obtain a higher standard of machining accuracy. The supporting force is closely related to the magnetic induction intensity generated by this device,so the magnitude of magnetic induction is the key to the performance of the flexible auxiliary support device. The finite-element method is applied to explore the influence of the excitation core’s structure,the coil energization mode and the machining workpiece materials on the magnetic field at the working gap of the device. The intensity of magnetic induction with different parameters is simulated. Based on these results,the structural parameters of the magnetorheological flexible auxiliary support device are identified. The magnetic-circuit simulation results show that the intensity of magnetic induction at the working gap meets the design requirements and provides auxiliary support for a higher standard of machining accuracy.