单颗粒金刚石加工SiCp/Al复合材料的仿真与实验研究

Simulation and experimental study on single diamond grit of machining SiCp/Al composites

通过运用有限元分析软件ABAQUS建立二维平面单颗磨粒切削模型,对Si C颗粒体积分数为45%的Si Cp/Al的加工过程进行了仿真与实验研究,分析了不同的加工参数对切削力产生的影响,并研究了切削后已加工表面的表面形貌。实验结果和仿真结果均表明在一定条件下切削深度比切削速度对切削力的影响更显著,当切削深度一定时,切削速度对切削力的变化影响不大;当切削速度一定时,切削深度越大,切削力越大。单颗金刚石磨粒对复合材料中增强相的作用主要表现在Si C颗粒的旋转、移动,而由此造成的不连续的坑洞是加工过程中表面形成的主要缺陷。

A two-dimensional plane single grit cutting model is established by using finite element analysis software of ABAQUS. The machining process of a single abrasive particle for cutting SiCp/Al composites with volume fraction of 45 % was studied. The effect of different machining parameters on cutting force and machined surface topography after cutting was analyzed through the experiment and simulation method. The experimental and simulation results show that the cutting depth has much more effect on the cutting force than the cutting speed in certain conditions. When the cutting depth are the fixed value, the cutting speed has lit- tle effect on the cutting force; when the cutting speed are fixed value, the more depth of cut is, the more force of the cutting can be gained. The effect of single diamond grit on reinforcement in composite materials is embodied in the rotation and movement of SiC. Discrete holes of the SiC particles are the main formed surface defects in the process.