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A gap-active electrical discharge machining (GA-EDM) to rectify the textural defects of the processed surface
Journal of Manufacturing Processes ( IF 6.2 ) Pub Date : 2021-02-20 , DOI: 10.1016/j.jmapro.2021.01.053
Shirsendu Das , Swarup Paul , Biswanath Doloi

Gap-active electrical discharge machining (GA-EDM) is a novel approach which provides a gap-sensible and auto-adjustable electrode-retraction system. This mechanism is conceptualized from the principle of ‘parallel-plate capacitor having two dielectric mediums’ where the inter-electrode surfaces are acted as the parallel plates. The kerosene is used as a fundamental dielectric substance, and a relatively denser and viscous layer of bio-oil is treated as secondary dielectric material. Besides this, a servo-controlled tool arrangement is employed, which is auto-sensible and synchronized with the flushing system. This multi-dielectric enhances the equivalent capacitance of the plasma-column and can dissipate huge energy during the discharging phase. The extensive heat melts most of the solidification defects and reforms the entire texture, which is far better than the surface developed with normal EDM. Moreover, the viscous layer of the secondary fluid (above the workpiece) provides an adhesive grip and slow heat dissipation procedure, which can check the formation of micro-cracks, develop due to residual effect of rapid quenching. Besides these, the flushing sensible electrode retraction system ensures an adequate passage for flushing, which helps in proper debris-expelling and controlled heat dissipations. Therefore, the adopted gap-active (GA) mechanism can facilitate better textual features with negligible indentation, solidified-agglomerates, and cracks. It is observed that the secondary dielectric enriches the carbon containments in the texture and forms a 10–14 % harder surface than the normal-EDM.



中文翻译:

间隙活性放电加工(GA-EDM)以纠正加工表面的纹理缺陷

间隙主动放电加工(GA-EDM)是一种新颖的方法,可提供间隙感应和自动调节的电极回缩系统。从“具有两个介电介质的平行板电容器”的原理来概念化该机制,其中电极间表面用作平行板。煤油用作基本的介电物质,相对致密且粘稠的生物油层被视为辅助介电材料。除此之外,还采用了伺服控制的工具装置,该装置可自动感应并与冲洗系统同步。这种多电介质增强了等离子柱的等效电容,并可以在放电阶段耗散大量能量。大量的热量熔化了大部分凝固缺陷,并重整了整个纹理,这远远优于普通EDM所开发的表面。此外,次要流体(工件上方)的粘性层提供了粘合力和缓慢的散热过程,这可以检查由于快速淬火的残留效应而形成的微裂纹的形成。除此之外,冲洗敏感电极回缩系统确保冲洗有足够的通道,这有助于适当地排屑并控制散热。因此,采用的缝隙主动(GA)机制可以使压痕,凝固团聚体和裂纹可忽略不计,从而促进更好的文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。次要流体(工件上方)的粘性层提供了粘合力和缓慢的散热过程,这可以检查由于快速淬火的残留效应而形成的微裂纹的形成。除此之外,冲洗敏感电极回缩系统确保冲洗有足够的通道,这有助于适当的排屑和受控的散热。因此,采用的缝隙主动(GA)机制可以使压痕,凝固团聚体和裂纹可忽略不计,从而促进更好的文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。次要流体(工件上方)的粘性层提供了粘合力和缓慢的散热过程,这可以检查由于快速淬火的残留效应而形成的微裂纹的形成。除此之外,冲洗敏感电极回缩系统确保冲洗有足够的通道,这有助于适当地排屑并控制散热。因此,采用的缝隙主动(GA)机制可以促进更好的文本特征,并具有可忽略的压痕,凝固的附聚物和裂缝。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。由于快速淬火的残留效应,可以检查微裂纹的形成。除此之外,冲洗敏感电极回缩系统确保冲洗有足够的通道,这有助于适当的排屑和受控的散热。因此,采用的缝隙主动(GA)机制可以使压痕,凝固团聚体和裂纹可忽略不计,从而促进更好的文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。由于快速淬火的残留效应,可以检查微裂纹的形成。除此之外,冲洗敏感电极回缩系统确保冲洗有足够的通道,这有助于适当的排屑和受控的散热。因此,采用的缝隙主动(GA)机制可以使压痕,凝固团聚体和裂纹可忽略不计,从而促进更好的文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。采用的缝隙主动(GA)机制可以使压痕,凝固团块和裂纹可忽略不计,从而改善文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。采用的缝隙主动(GA)机制可以使压痕,凝固团聚体和裂纹可忽略不计,从而改善文本特征。可以观察到,次级电介质丰富了纹理中的碳含量,并形成了比普通EDM硬10-14%的硬表面。

更新日期:2021-02-21
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