Experimental study on micro electrical discharge machining of porous stainless steel
Experimental study on micro electrical discharge machining of porous stainless steel
复制标题
多孔不锈钢微细放电加工实验研究
DOI：
10.1007/s00170-016-9611-3
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发表时间：
2017-06-01
影响因子：
3.4
通讯作者：
Zhang, Jianhua
中科院分区：
文献类型：
--
作者：
Wang, Kan;Zhang, Qinhe;Zhang, Jianhua
多孔金属和合金是理想的轻量化和阻尼材料，由于其优越的机械和冶金特性而获得了重要的研究关注。微电火花加工（Micro EDM）是加工多孔金属的一种替代方法。本研究对多孔不锈钢（PSS）进行了实验，以确定不同孔隙率和孔径的奥氏体不锈钢（AISI 304）和PSS样品的微电火花加工性能。基于多孔材料的热传导理论对实验结果进行了分析。由于其孔隙率，PSS总体上比AISI 304具有更好的加工性能；此外，孔隙率和孔径对PSS的加工特性有显著影响。孔隙率和孔径越大，材料去除率（MRR）越高，刀具相对磨损比（RTWR）越低。由于孔隙的存在，热导率降低，导致通过热传导损失的热量减少，为了去除材料而消耗的能量增加。实验电路中高电容适合加工PSS，而高开路电压更适合加工AISI 304。
Porous metals and alloys are ideal lightweight and damping materials which have garnered significant research attention owing to their superior mechanical and metallurgical characteristics. Micro electrical discharge machining (micro EDM) is an alternative method for machining porous metals. In this study, experiments on porous stainless steel (PSS) were conducted to determine the micro EDM performance of austenitic stainless steel (AISI 304) and PSS samples with various porosities and pore sizes. The results were analyzed based on the thermal conduction theory of porous materials. PSS achieved better machining performance overall compared to AISI 304 due to its porosity; further, porosity and pore size were shown to have a significant influence on the machining characteristics of PSS. The larger the porosity and pore size, the higher the material removal rate (MRR) and the lower the relative tool wear ratio (RTWR). Thermal conductivity decreases due to the existence of pores, causing less heat to be lost by heat conduction and more energy to be consumed in order to remove the material. High capacitance in the experimental circuit proved suitable for machining PSS, while high open circuit voltage appeared to be more suitable for machining AISI 304.