In this paper, experimental and numerical studies on drilling of multi-material made of CFRP laminate sandwiched with aluminum part have been carried out. These tests have been conducted using carbide drills (K20) to study the influence of spindle speed, feed rate and lip length of the double cone drill on cutting forces and holes quality. From the experimental study it was found that the double cone drills used for the experimental analysis encountered less thrust force compared to the standard twist drill. In addition the quality of the holes after drilling was evaluated, and found that no delamination (entry and exit of the hole of the composite part) even at higher feed rate (＞ to 0.1 mm/rev). By numerical modeling, it was noticed that, after machining with standard twist drill at higher feed rates, the thrust force generated induces a small opening at the CFRP/A1 interface.
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机译：本文对由碳纤维增强复合材料夹层铝材制成的多材料钻孔进行了实验和数值研究。这些测试已使用硬质合金钻头（K20）进行，以研究主轴转速，双锥钻头的进给速度和刃口长度对切削力和孔质量的影响。从实验研究中发现，与标准麻花钻相比，用于实验分析的双锥钻遇到的推力较小。此外，对钻孔后的孔质量进行了评估，发现即使在较高的进给速度（>至0.1 mm / rev）下也不会发生分层（复合零件孔的进入和离开）。通过数值建模，可以注意到，在使用标准麻花钻以更高的进给速率进行加工之后，所产生的推力会在CFRP / A1界面处引起一个小的开口。
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