磁控散体抛光的机理及实验研究

为提高模具自由曲面的抛光效率和抛光质量，提出一种磁控散体抛光方法，通过调节磁场强度，改变抛光头内铁磁散体间的作用力，从而实现抛光头柔度的调节。文章基于莫尔·库伦破坏准则、磁偶极子、弹性力学等理论，推导出铁磁散体抗剪能力的关系式，得到理想状态下的抗剪能力模型。以该模型为基础，通过实验获得了铁磁散体在磁场作用下的抗剪力模型。研究表明，在磁场作用下，铁磁散体的抗剪能力由非磁致抗剪能力、抗剪切力及磁致抗剪能力、抗剪切力两部分组成，其中磁致抗剪能力和抗剪切力与磁场强度、铁磁材料的体积等因素相关。根据上述工程理论模型及磁控散体抛光装置柔度调节原理，设计了磁控散体抛光的原型样机，为实现模具自由曲面高效抛光提供了一种新方法和装置。图5表1参7

Physical Mechanism and Experimental Study of Ferromagnetic Granular Polishing

In quality of the this paper, a ferromagnetic granular polishing method is mold free surface through an adjustable flexibility polishing proposed to improve polishing efficiency and device, the polishing pressure of this device is tuned by the coil＇s magnetic field, which is proportioned to the excitation current. Based on Mohr-Coulomb＇s failure criterion, magnetic dipole and elasticity theory, the anti-shear capacity model of ferromagnetic granular in an ideal state is studied. The experiment illustrates that the anti-shear capacity of ferromagnetic granular includes nonmagnetic-induced anti-shear part and magnetic-induced anti-shear part, and the magnetic anti-shear capacity and anti-shear foprce is involved with magnetic field and the volume of ferromagnetic materials. According to above all theoretical equation and the method of adjustment flexibility of polishing tool, a prototype of polishing machine is designed. The result shows that the proposed method and device is also provided with high polishing efficiency and quality for polishing mold free-form surface. Ch,5 fig. 1 tab. 7 ref. ]