Light emission, chip morphology, and burr formation in drilling the bulk metallic glass
Light emission, chip morphology, and burr formation in drilling the bulk metallic glass
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DOI：
10.1016/j.ijmachtools.2004.11.004
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发表时间：
2005-06
影响因子：
14
通讯作者：
M. Bakkal;A. Shih;S. Mcspadden;C. Liu;R. Scattergood
中科院分区：
文献类型：
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作者：
M. Bakkal;A. Shih;S. Mcspadden;C. Liu;R. Scattergood
研究了锆基块体金属玻璃（BMG）材料钻削过程中的切屑光发射、切屑形貌、毛刺形成及已加工表面。这项研究表明，工作和刀具材料以及进给速度和主轴转速，两个钻孔工艺参数，都影响芯片光发射的发病。低进给速度和高主轴转速增加了比切削能，促进了切屑的放热氧化和发光。在BMG钻削中观察到六种类型的切屑形貌：粉末状、短带状、长带状、长螺旋状、长带状缠结状和扇形。长带状缠结切屑形态是BMG材料所特有的。在快速停止条件下的加工表面上，观察到具有支流、空洞和脉纹图案的金属玻璃特有的断裂形貌。观察到不同的毛刺形成：入口处的翻转形状和出口边缘的冠状形状。出口边缘中的毛刺的尺寸通常大于入口边缘中的毛刺的尺寸。高进给速度有助于减少入口和出口边缘的毛刺尺寸。本研究的结论是，WC-Co刀具材料，由于其高的导热性和硬度，表现出更好的钻削BMG比高速钢刀具。
The chip light emission, chip morphology, burr formation and machined surface in drilling of Zr-based bulk metallic glass (BMG) material are investigated. This study demonstrates that the work- and tool-material as well as the feed rate and spindle speed, two drilling process parameters, all affect the onset of chip light emission. Slow feed rate and high spindle speed increase the specific cutting energy and promote the exothermic oxidation and light emission of the chip. Six types of chip morphology, powder, short ribbon, long ribbon, long spiral, long ribbon tangled, and fan, are observed in BMG drilling. The long ribbon tangled chip morphology is unique for BMG material. On the machined surface under quick stop condition, the fracture topography unique to metallic glass with tributary, void, and vein patterns is observed. Different burr formations are observed: the roll-over shape in the entry and the crown shape in the exit edge. The size of burr in the exit edge is typically larger than that in the entrance edge. High feed rate helps to reduce the size of burr in both entrance and exit edges. This study concludes that the WC–Co tool-material, due to its high thermal conductivity and hardness, performs better in drilling BMG than the high speed steel tool.