摘要
金属玻璃钻削高温极易导致光发射、大毛刺和孔烧蚀等严重问题.研究锆基金属玻璃在干切削、冰冻切削和切削油条件下的钻削过程、钻削特征及孔质量,通过对比三种冷却润滑条件下的轴向力动态变化过程、钻削能、刀具磨损以及孔口毛刺,提出适用于金属玻璃钻削加工的工艺方法.研究结果表明:刀具磨损积累与热软化是影响金属玻璃钻孔过程及轴向力动态变化的主要因素;干切削会使孔材料处于过冷液态,导致孔无法成形.金属玻璃入口孔毛刺主要为冠状和无规则扭曲形毛刺;出口孔毛刺主要为冠状毛刺.冰冻切削仅适用于低速钻削金属玻璃;切削油条件下高速钻削金属玻璃可获得最佳孔口质量和最长刀具寿命.
Abstract
The high temperature during bulk metallic glass(BMG)drilling can easily lead to serious problems such as light emission,large burrs,and hole erosion.This paper studies the drilling process,characteristics and hole quality of zir-conium-based BMG under dry cutting,freezing cutting,and cutting fluid condition.By comparing the dynamic change process of thrust force,drilling energy,tool wear and hole burr under three cooling and lubrication conditions,a process method suit-able is put forward for BMG drilling.The results indicate that the accumulation of tool wear and thermal softening are the main factors affecting the drilling process of BMG and the dynamic changes of thrust force,dry cutting can cause the hole material to be in a supercooled liquid state and the hole cannot be formed.The burrs of the metal glass entrance hole are mainly coro-nal and irregular twisted burr,while the exit hole are coronal burrs.Frozen cutting is only suitable for low-speed drilling of BMG,the best hole quality and the minimal tool wear can be obtained by high-speed drilling with cutting fluid.
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