Enhanced machinability of SiC-reinforced metal-matrix composite with hybrid turning
Enhanced machinability of SiC-reinforced metal-matrix composite with hybrid turning
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DOI：
10.1016/j.jmatprotec.2019.01.017
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发表时间：
2019-06-01
影响因子：
6.3
通讯作者：
Silberschmidt, Vadim V.
中科院分区：
文献类型：
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作者：
Bai, Wei;Roy, Anish;Silberschmidt, Vadim V.
颗粒增强金属基复合材料具有优异的力学性能和热学性能，是一种很有前途的工程材料。然而，由于硬质陶瓷颗粒的存在，导致刀具在加工过程中迅速磨损，它们的加工性差阻碍了它们在更广泛的应用中的使用。超声辅助车削(UAT)是一种使刀具在高频和低振幅下振动的混合加工技术。比较了硬质合金(WC)和聚晶金刚石(PCD)刀具在UAT和常规车削条件下加工SiCp/Al金属基复合材料的加工性能和刀具磨损。在超声辅助下，切削力显著降低，切削温度略有提高。UAT可获得连续和半连续的切屑，表面形貌较好。UAT中的切屑形成机制显示，当经历重复的高频微切削工艺时，工件材料的延展性增加。WC刀具在常规车削和UAT加工过程中均出现磨粒磨损和粘着磨损。然而，使用WC刀具在UAT中获得的加工表面与使用PCD刀具获得的加工表面相当，有时甚至更好。
Particle-reinforced metal-matrix composites are promising engineering materials thanks to their superior mechanical and thermal properties. However, their poor machinability is a deterrent for use in wider applications, due to the presence of hard ceramic particles, which results in rapid tool wear during machining. Ultrasonically assisted turning (UAT) is a hybrid machining technique, in which the cutting tool is made to vibrate at high frequencies and low amplitudes. In this study, the machinability and tool wear of machining SiCp/Al metal matrix-composite was compared for thy UAT and conventional turning with the use of a cemented carbide (WC) and a polycrystalline diamond (PCD) tool. With the use of ultrasonic assistance, a significant reduction in cutting forces was achieved with a slight increase in cutting temperature. Continuous and semi-continuous chips were obtained in UAT, with better surface topography. A chip-formation mechanism in UAT show increased ductility of the workpiece material when subjected to a repeated high-frequency microchipping process. Abrasive and adhesive wear occurred on the WC tool in both conventional turning and UAT. However, the machined surface obtained in UAT with a WC tool was comparable and sometimes even better than that achieved with the PCD tool.