Combining PMEDM with the tool electrode sloshing to reduce recast layer of titanium alloy generated from EDM
Combining PMEDM with the tool electrode sloshing to reduce recast layer of titanium alloy generated from EDM
复制标题
粉末冶金加工与工具电极晃动相结合减少电火花加工钛合金重铸层
DOI：
10.1007/s00170-021-07808-7
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发表时间：
2021-08
期刊：
影响因子：
--
通讯作者：
Hang Zhao
中科院分区：
文献类型：
--
作者：
Bin Xu;Man-qun Lian;Sheng-gui Chen;Jian-guo Lei;Xiao-yu Wu;Cheng Guo;Tai-jiang Peng;Jun Yang;Feng Luo;Hang Zhao
钛合金以其优异的材料性能在工业领域得到了广泛的应用。电火花加工是钛合金常用的加工技术。钛合金电火花加工时，不可避免地会在其表面产生重铸层，影响表面质量和使用寿命。针对上述问题，本文提出在电火花油中加入B4C粉末，配合工具电极晃动进行钛合金粉末混合电火花加工(PMEDM)，可以减小重铸层厚度，从而提高加工表面质量。首先，将B4C粉末混合在火花油中，对钛合金进行了PMEDM加工。在此过程中，初步减薄了再铸层厚度，提高了加工表面质量。其次，当钛合金的PMEDM加工接近完成时，工具电极在电火花加工间隙内沿机床主轴摆动。将PMEDM与工具电极晃动相结合，进一步消除了加工表面的重铸层，进一步提高了加工表面的质量。通过在火花油中加入3000目B4C粉末，结合工具电极晃动，实现了钛合金的PMEDM加工。在合适的工艺参数作用下，钛合金获得了表面粗糙度Ra为0.205μm的微沟槽组织，加工表面的再铸层几乎看不见。
Titanium alloy has been widely applied in industrial fields because of its excellent material properties. Electrical discharge machining (EDM) is commonly technology for processing titanium alloy. When titanium alloy was processed by EDM, a recast layer was inevitably be produced on its surface, which can adversely affect the surface quality and working life. Focus on the above problem, this paper proposed to add B4C powders into the spark oil and cooperate with the tool electrode sloshing for powder mixed electrical discharge machining (PMEDM) of titanium alloy, which can reduce the thickness of the recast layer and thereby improve the quality of the machined surface. Firstly, B4C powders were mixed in the spark oil and the PMEDM of the titanium alloy was carried out. In this step, the thickness of recast layer was preliminarily reduced and the quality of machined surface was improved. Secondly, when the PMEDM of the titanium alloy was nearly completed, the tool electrode sloshed along the machine tool spindle within the EDM gap. Combining PMEDM with the tool electrode sloshing, the recast layer on the machined surface was further eliminated and the quality of machined surface was further improved. By adding 3000 mesh B4C powders into the spark oil, the paper carried out the PMEDM of titanium alloy combining with the tool electrode sloshing. Under the action of appropriate process parameters, the micro-groove structure with surface roughness Ra of 0.205 μ m was obtained in the titanium alloy and the recast layer on the machined surface was almost invisible.
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DOI：
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