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首页> 外文期刊>Materials and Manufacturing Processes >An Experimental Study on the Geometry of Microholes in Microelectric Discharge Machining
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An Experimental Study on the Geometry of Microholes in Microelectric Discharge Machining

机译：微放电加工中微孔几何形状的实验研究

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摘要

Shape and dimensional geometry of blind microholes produced by microelectric discharge machining (micro-EDM) is investigated experimentally to explore the relational dependency with respect to machining time. For this purpose, microholes are machined with machining times ranging from 1-80min on plastic mold steel samples using tungsten carbide tool electrode and hydro carbide dielectric liquid composed of mineral and synthetic oils. All other operational machining parameters such as pulse time, gap voltage, average current, and so forth, are kept constant during machining. Depth, diametric expansions, end-tip shape, wall side parallelisms of holes were analyzed both on surface and cross-sections of the samples. Consequently, nine different end-tip shape formations were observed, and these shapes discussed on basis of dielectric liquid circulation and sparking conditions during machining. Enlargement in hole diameter was predicted by denning a band-width of 20 mum hole expansion. Moreover, parallel wall-side length was expressed as the microhole depth where 5 percent reduction in entrance diameter was measured at the tapered section.
机译：通过实验研究了微放电加工（micro-EDM）产生的盲微孔的形状和尺寸几何形状，以探索与加工时间的关系。为此，使用碳化钨工具电极和由矿物油和合成油构成的碳化氢介电液，在塑料模具钢样品上加工的微孔加工时间为1-80分钟。在加工过程中，所有其他操作加工参数（例如脉冲时间，间隙电压，平均电流等）均保持恒定。分析了样品的表面和横截面的深度，直径扩展，尖端形状，孔的壁侧平行度。因此，观察到了九种不同的尖端形状，并且在加工过程中根据介电液体循环和火花条件讨论了这些形状。孔直径的扩大是通过缩小20毫米的孔扩展带宽来预测的。此外，平行壁侧的长度表示为在锥形截面处测得的入口直径减小了5％的微孔深度。

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