Study of influence function of finishing process is very important for setting the process parameters. In this article, influence function of magnetorheological finishing (MRF) process is investigated numerically and experimentally by studying the flow behaviour of magnetorheological (MR) fluid. A 3D computational fluid dynamics simulation is performed considering MR fluid as a Herschel–Bulkley fluid. Dynamic pressure and wall shear stress on the workpiece surface are determined for different working gaps and rotational speeds. Variable depth of indentation by abrasive particle on oxygen-free high conductivity copper is calculated numerically and correlated with the experiments. Depth and area of influence function increase with spindle speed and reducing working gap. Dynamic pressure decides the indentation depth which is related to normal force, whereas wall shear stress removes the material up to the indentation depth which is related to the tangential force. Influence function shows two separate regions at the edge of magnet due to variable magnetic flux density. Contact length of MR fluid with workpiece and squeezing of MR fluid play significant role in material removal. Experiments are carried out to study forces acting on the workpiece, indentation depth and validation of simulation results.

研究精加工过程的影响函数对于设定工艺参数非常重要。本文通过研究磁流变（MR）流体的流动行为，对磁流变精加工（MRF）过程的影响函数进行了数值和实验研究。考虑到MR流体为Herschel-Bulkley流体，进行了3​​D计算流体动力学模拟。确定不同工作间隙和转速下工件表面的动压力和壁面剪应力。数值计算了磨料颗粒在无氧高电导率铜上的可变压痕深度，并与实验相关。影响功能的深度和面积随主轴转速的增加而增加，从而减小了工作间隙。动压力决定了与法向力有关的压痕深度，而壁切应力将材料去除到与切向力有关的压入深度。由于可变的磁通量密度，影响函数在磁体边缘显示两个单独的区域。MR流体与工件的接触长度以及MR流体的挤压在材料去除中起着重要作用。进行实验以研究作用在工件上的力，压痕深度和模拟结果的验证。