ABSTRACT Carbon fiber reinforced composites (CFRP) have superior mechanical properties such as high strength/density ratio, and good damping ability. CFRP which is frequently used in parts in the aviation industry can also be single or stacked together with titanium and aluminum alloys. However, delamination could occur on the CFRP surfaces after drilling which leads to deterioration in mechanical properties. Therefore, in this paper, the effect of process parameters and stack order on cutting force, torque are investigated. The tests were carried out at three different drilling speeds and feed rates on a CNC vertical machine tool by using a solid carbide cutting tool. The results of hole quality indicate that the process outputs are significantly affected by process parameters and stack order. The force and torque values obtained at high drilling speeds and low feed rates are independent of the stack order. However, the stacking order is determined to be the most effective parameter for the thrust force and torque values. The force generated during the Ti/CFRP/Al stack in which the highest force value is approximately 50% higher than the lowest force which occurs on Al/Ti/CFRP stack. The surface roughness value measured during the Al/Ti/CFRP stack is approximately half of the other stack order.

中文翻译：

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Al/Ti/CFRP混合复合材料钻孔试验分析

【摘要】：碳纤维增强复合材料(CFRP)具有强度/密度比高、阻尼性能好等优异的力学性能。航空工业中经常用于零件的CFRP也可以单独或与钛和铝合金堆叠在一起。然而，钻孔后CFRP表面可能发生分层，导致机械性能下降。因此，在本文中，研究了工艺参数和堆叠顺序对切削力、扭矩的影响。使用整体硬质合金刀具在数控立式机床上以三种不同的钻孔速度和进给率进行测试。孔质量的结果表明工艺输出受工艺参数和堆叠顺序的显着影响。在高钻孔速度和低进给速率下获得的力和扭矩值与堆栈顺序无关。然而，堆叠顺序被确定为推力和扭矩值的最有效参数。在 Ti/CFRP/Al 堆栈期间产生的力，其中最高力值比发生在 Al/Ti/CFRP 堆栈上的最低力高约 50%。在 Al/Ti/CFRP 堆叠期间测量的表面粗糙度值大约是其他堆叠顺序的一半。