Parasuraman S, Elamvazuthi I, Kanagaraj G, Natarajan Elango, Pugazhenthi A
School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 46150, Malaysia.
Department of Electrical & Electronic Engineering, University Teknologi Petronas, Seri Iskandar 32610, Malaysia.
Materials (Basel). 2021 Mar 31;14(7):1726. doi: 10.3390/ma14071726.
Reinforced aluminum composites are the basic class of materials for aviation and transport industries. The machinability of these composites is still an issue due to the presence of hard fillers. The current research is aimed to investigate the drilling topographies of AA7075/TiB composites. The samples were prepared with 0, 3, 6, 9 and 12 wt.% of fillers and experiments were conducted by varying the cutting speed, feed, depth of cut and tool nose radius. The machining forces and surface topographies, the structure of the cutting tool and chip patterns were examined. The maximum cutting force was recorded upon increase in cutting speed because of thermal softening, loss of strength discontinuity and reduction of the built-up-edge. The increased plastic deformation with higher cutting speed resulted in the excess metal chip. In addition, the increase in cutting speed improved the surface roughness due to decrease in material movement. The cutting force was decreased upon high loading of TiB due to the deterioration of chips caused by fillers. Further introduction of TiB particles above 12 wt.% weakened the composite; however, due to the impact of the microcutting action of the fillers, the surface roughness was improved.
增强铝基复合材料是航空和运输行业的基础材料类别。由于存在硬填料，这些复合材料的可加工性仍然是一个问题。当前的研究旨在研究AA7075/TiB复合材料的钻孔形貌。制备了含有0、3、6、9和12 wt.%填料的样品，并通过改变切削速度、进给量、切削深度和刀尖半径进行实验。研究了切削力和表面形貌、刀具结构和切屑形态。由于热软化、强度损失不连续性和积屑瘤减少，切削速度增加时记录到最大切削力。较高的切削速度导致塑性变形增加，产生过多的金属切屑。此外，切削速度的提高由于材料移动减少而改善了表面粗糙度。由于填料导致切屑恶化，TiB高负载时切削力降低。进一步引入超过12 wt.%的TiB颗粒会削弱复合材料；然而，由于填料微切削作用的影响，表面粗糙度得到改善。
