Study on EDM of PCD by Mixing Iron Powders

doi:10.3969/j.issn.1004-132X.2023.22.005

Abstract

Abstract: In order to improve the efficiency of EDM PCD, the spark discharge was promoted by mixing iron powders into kerosene working fluid. The mechanism of PCD in EDM of mixed iron powders was analyzed. The effects of iron powder concentration, peak current, pulse width, pulse and servo voltage on workpiece MRR and machining surface roughness were studied by experiments, and the reasons were analyzed. The experimental results show that kerosene mixed with a certain concentration of iron powders may improve the MRR of EDM PCD. The MRR increases with the increase of peak current, increases first and then decreases with the increase of pulse width, increases first and then decreases with the increase of pulse, and decreases with the increase of servo voltage. The surface roughness of EDM PCD is less affected by the concentration of iron powder, peak current, pulse width, pulse interpulse and servo voltage. The optimal combination of electrical parameters is obtained by orthogonal test: peak current 20 A, pulse width 125 μs, pulse interpulse 75 μs and servo voltage 27.5V.

Key words: , electrical discharge machining(EDM), polycrystalline diamond(PCD), iron powder, material removal rate(MRR), surface roughness

摘要： 电火花加工以其独特的优势成为加工聚晶金刚石（PCD）的重要手段，但该方法存在加工效率低的问题。初步探究了混铁粉电火花加工PCD的材料去除方式，进而提出了在煤油工作液中混入铁粉以促进火花放电形成的方法，通过实验研究了铁粉浓度、峰值电流、脉宽、脉间和伺服电压对工件材料去除率（MRR）和加工表面粗糙度的影响规律，并分析了其原因。实验结果表明，煤油中混入一定浓度的铁粉能够提高电火花加工PCD的MRR值，MRR值随着峰值电流的增大而提高，随着脉宽的增大先提高后降低，随脉间的增加先增大后减小，并且随着伺服电压的增大而减小，电火花加工PCD的表面粗糙度受铁粉浓度、峰值电流、脉宽、脉间和伺服电压的影响较小，主要取决于金刚石颗粒的粒度，通过正交试验得到电参数优化组合为：峰值电流20 A,脉宽125 μs,脉间75 μs,伺服电压27.5 V。

关键词: 电火花加工, 聚晶金刚石, 铁粉, 材料去除率, 表面粗糙度

CLC Number:

TG661

JIA Zhixin, ZHANG Kaiyue, WANG Jin. Study on EDM of PCD by Mixing Iron Powders[J]. China Mechanical Engineering, 2023, 34(22): 2684-2692.

贾志新, 张凯悦, 王津. 聚晶金刚石的混铁粉电火花加工方法研究[J]. 中国机械工程, 2023, 34(22): 2684-2692.

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