中文摘要：

利用磨粒流的流变特性,通过对应力张量的分析,研究了磨粒流加工中的微切削力。提出了磨粒流加工是兼挤压与微去除方式为一体的复合加工,微切削动力主要来自于磨粒挤压力、磨粒的犁削力及磨料介质的剪切力。建立了磨粒流动力学模型,通过改变磨粒流流道的加工条件和测试加工过程的接触区压力、去除量及表面粗糙度等参数,用量化的方式揭示了磨粒流加工中抽象微切削力的变化规律。最后,结合COMSOL Multiphysics软件的CFD模块数值仿真了剪切力。结果显示：基于加模芯的方法有效地提高了磨粒流加工的微切削力,滑块4经15次循环后表面粗糙度由加工前的2.918μm下降为1.027μm,而去除量下降了0.09g。实验表明,磨粒流加工中去除量确有变化,但随着加工次数增加去除作用迅速削弱,而表面粗糙度在挤压力的作用下仍有所降低。

英文摘要：

On the basis of rheological behaviors of abrasive flow,the stress tensor was analyzed to explore the micro-cutting force of the Abrasive Flow Machining（AFW）process.It points out that the abrasive flow precision machining is a combined machining method made by extrusion and micro removal,and the micro-cutting force of the AFW is come from a combination of medium share force,squeezing force and plowing force.The dynamics model was established and general change law of the micro-cutting force in AFW processing were revealed quantitatively by changing processing conditions and processing parameters,such as the pressure of contact region,removal amounts and surface roughness.Finally,the shear force was simulated numerically by using the CFD module of COMSOL multiphysics software.The experiment results show that the mold core is conductive to increasing the micro-cutting force,the surface roughness Raof the solider（number four）has decreased from 2.918μm to 1.027μm and the removal is 0.09 g after 15 processing cycles.The results demonstrate that the removal is changed in the abrasive flow machining process,however,the removal action is quickweakened with the increase of the times of extrusion and the surface roughness is still improved.