Surface Generation Mechanism in Electrical Discharge Machining with Silicon Powder Mixed Fluid

Surface Generation Mechanism in Electrical Discharge Machining with Silicon Powder Mixed Fluid
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硅粉混合液放电加工表面生成机理

DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Izuru Kamekawa
Izuru Kamekawa
中科院分区：
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文献类型：
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作者：
Y. Uno;A. Okada;Izuru Kamekawa

文献摘要

被引文献

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电火花加工（EDM）产生的表面通常是无光泽的。但是，与煤油型电火花加工相比，硅粉混合液电火花加工的加工表面光泽度更高，表面粗糙度更小，从而导致金属模具的手工精研磨被省略。加工表面的质量很大程度上取决于工件材料的种类，但其表面形成机理目前还不十分清楚，本文通过实验研究了硅粉混合对表面形成机理的影响，分析了单脉冲放电形成的凹坑形状、表面粗糙度、加工表面等，得到的主要结论如下：（1）采用硅粉混合液进行电火花加工时，由于硅粉混合液的电阻率较低，以及硅粉在差距中排列方式的影响，其电火花加工的差距距离比煤油型电火花加工的间隙距离大。(2)采用硅粉混合液进行电火花加工时，由于加工液的蒸发和膨胀作用在工件上的冲击力较小，因此加工坑的起伏较小。(3)工件中析出的碳化物越多，表面粗糙度就越大，这是因为在电火花加工过程中，由于频繁的热冲击，碳化物会由于裂纹扩展而脱落。(4)采用硅粉混合液进行电火花加工，加工过程稳定，电极与工件之间无短路现象。
The surface generated by electrical discharge machining (EDM) appears to be generally mat. However, the machined surface in EDM with silicon powder mixed fluid becomes glossier and has a smaller surface roughness than that in conventional EDM with kerosine type fluid, which leads to the omission of finish hand lapping of metal mold. The quality of machined surface significantly depends on the kind of workpiece material, but the surface generation mechanism has not yet been made clear sufficiently.In this study, the effect of silicon powder mixing on the surface generation mechanism is experimentally investigated, analyzing the shape of crater generated by a single pulse discharge, the surface roughness, the machined surface and so on. Main conclusions obtained are as follows:(1) The gap distance in EDM with silicon powder mixed fluid is larger than that with kerosine type fluid, because of the lower resistivity of the former and the influence of silicon powder arrangement in the gap.(2) EDM with silicon powder mixed fluid leads to smaller undulation of a crater, because of the smaller impact force acting on the workpiece due to evaporation and expansion of machining fluid.(3) The more the precipitated carbides in the workpiece are, the larger the surface roughness is, since the carbides come off because of crack propagation due to the frequent heat impact during EDM.(4) EDM with silicon powder mixed fluid results in the stable machining without short circuit between the electrode and the workpiece.