Micro-cutting characteristics of EDM fabricated high-precision polycrystalline diamond tools
Micro-cutting characteristics of EDM fabricated high-precision polycrystalline diamond tools
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DOI：
10.1016/j.ijmachtools.2012.10.007
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发表时间：
2013-02
影响因子：
14
通讯作者：
Zhiyu Zhang;H. Peng;Jiwang Yan
中科院分区：
文献类型：
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作者：
Zhiyu Zhang;H. Peng;Jiwang Yan
为了在陶瓷模具材料上制造微凹坑、微凹槽和微通道等三维微结构，超硬材料模具制造是必不可少的一步。在这项工作中，微细放电加工（EDM）被用来制造高精度聚晶金刚石立铣刀。通过在极低放电能量条件下利用金刚石晶粒的放电诱导石墨化，实现了一微米级的形状精度和边缘锐度。通过在碳化钨模具基体上加工微凹坑和微凹槽来检查所制造刀具的切削性能。结果表明，使用 EDM 制造的刀具，实现了碳化钨的延性加工，表面光洁度达到 2nmRa，与抛光加工的表面光洁度相当。
To fabricate three-dimensional microstructures, such as micro dimples, micro grooves and micro channels, on ceramic mold materials, tool fabrication with super hard materials is an essential step. In this work, micro electro discharge machining (EDM) was used to fabricate high-precision polycrystalline diamond end mills. Form accuracy and edge sharpness in one micron level were achieved by utilizing electro discharge induced graphitization of diamond grains under extremely low discharge energy conditions. The cutting performance of the fabricated tools was examined by machining micro dimples and micro grooves on tungsten carbide mold substrates. Results showed that using the EDM-fabricated tools, ductile mode machining of tungsten carbide was realized with a surface finish of 2nmRa, which is comparable to that produced by polishing.