Disign and Fablication of Polycrystalline Diamond Tool for Drilling of Aluminum Silicon Carbide Metal Matrix Composite (1994)

金属基复合材料（MMC）的发展在很大程度上是由高性能部件的刚度提高和重量减轻的前景推动的。此类材料已逐渐进入更高容量的应用，特别是在汽车领域。MMC可用于发动机、制动系统和齿轮箱等领域，但也可用于制造更轻、更经济的车辆。本文概述了在烧结碳化钨和多晶金刚石（PCD）刀具上对含15体积%碳化硅（SiC）颗粒增强的2618铝合金进行钻削和端面铣削试验的结果。根据刀具寿命标准，PCD产品通常被证明是最有效的，也是唯一能够提供实际操作性能的刀具材料。在钻孔操作中，PCD钻头切削300个孔，唇侧面磨损仅为0.08 mm，而使用碳化钨钻头时，在侧面磨损达到0.6 mm之前只能切削48个孔。主轴转速变化对磨损率影响不大。在钻削过程中，进给速度被证明是关键参数。当使用硬质合金刀具进行面铣时，在后刀面磨损达到0.4 mm之前，只能切削120 m（切削长度）。PCD刀具切削3600 m时，后刀面磨损仅为0.05 mm。在这些操作中，切削速度的变化（小于5米/秒）没有显着影响后刀面磨损率。然而，PCD刀具的晶粒尺寸是减少刀具磨损的关键因素。与其他这些类型的具有不同晶粒尺寸的刀具相比，具有50 μ m晶粒尺寸的PCD刀具表现出良好的耐磨性。

The development of metal matrix composites (MMC) has been motivated largely by the prospect of improved stiffness and weight savings in high performance components. Such materials have progressively moved into higher volume applications, notably in the automotive field. MMC offer the potential for lighter, more economical vehicles though tehir use in engine, brake system and gear box applications.The paper outline the results of drilling and face milling tests performed on an aluminum 2618 alloy reinforced with 15 vol% silicon carbide (SiC) particulate.Sintered tungsten carbide and polycrystalline diamond (PCD) cutting tools were used. Based on a tool life criterion PCD products proved, in general, to be the most effective and the only tool material capable of providing a realistic operating performance. In drilling operations, PCD tipped drills cut 300 holes with only 0.08 mm of lip flank wear, while only 48 holes could be made before flank wear reached 0.6 mm when using tungsten carbide drills. Changing in spindle speed did not considerable effect for wear ratte. In drilling feed rate proved to be the key parameter.When using tungsten carbide tools in face milling only 120 m (cutting length) could be made before flank wear reached 0.4 mm. PCD tools cut 3600 m with only 0.05 mm of flank wear. In these operations, changes in cutting speed (less than 5 m/s) did not significantlyeffect flank wear rate. However, the grain size of PCD tools was a key factor to diminish the tool wear. A PCD tool with 50mum grain size exhibited good wear resistance compare with the other these types of tools with different grain size.