Some investigations on surface quality indicators for OHNS die steel machined with suspended powder EDM process

Q3 Engineering

International Journal of Machining and Machinability of Materials Pub Date : 2020-04-13 DOI:10.1504/ijmmm.2020.10028420

N. Khedkar, A. Bongale, Satish Kumar, V. Khedkar, D. Kumar

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引用次数: 1

Abstract

The study focuses on the evaluation of surface quality characteristics of oil hardened non shrinking die steel surface machined with suspended powder electrical discharge machining process. Pure copper metal is used as an electrode material, and tungsten powder is used as suspended medium for the purpose. Machining experiments were carried out by varying one parameter at a time. After each test, the machined surface is analysed for evaluating its surface roughness and microhardness values. It is found that combination of 4 A gap current, 12 μs pulse on span and 7 μs pulse off span will result in optimum surface quality indicators for the SPEDM process. Also, dry sliding wear experiments were carried out on the machined surface to evaluate the frictional force and coefficient of friction. Spectroscopic analysis and energy dispersive X-ray diffraction analysis on the machined surface indicate a considerable rise in carbon and tungsten content on the recast white layer of the machined surface. Scanning electron microscopic analysis of the machined surface revealed the presence of compounds of tungsten on the recast white layer. Also, micro-cracks were observed on the machined surface which is due to higher gap current setting during EDM process.

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悬浮粉末电火花加工OHNS模具钢表面质量指标的研究

研究了悬浮粉电火花加工油淬无收缩模具钢表面的表面质量特性。纯铜金属被用作电极材料，钨粉末被用作悬浮介质。通过一次改变一个参数来进行加工实验。每次试验后，对加工表面进行分析，以评估其表面粗糙度和显微硬度值。研究发现，对于SPEDM工艺，4A间隙电流、12μs脉冲上跨和7μs脉冲下跨的组合将产生最佳的表面质量指标。此外，还对加工表面进行了干滑动磨损实验，以评估摩擦力和摩擦系数。机加工表面的光谱分析和能量色散X射线衍射分析表明，机加工表面重铸白色层上的碳和钨含量显著增加。对机加工表面的扫描电子显微镜分析显示，在重铸的白色层上存在钨化合物。此外，由于电火花加工过程中间隙电流设置较高，在加工表面上观察到微裂纹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Machining and Machinability of Materials Engineering-Industrial and Manufacturing Engineering

CiteScore

2.40

自引率

0.00%

发文量

期刊介绍： IJMMM is a refereed international publication in the field of machining and machinability of materials. Machining science and technology is an important subject with application in several industries. Parts manufactured by other processes often require further operations before the product is ready for application. Machining is the broad term used to describe removal of material from a workpiece, and covers chip formation operations - turning, milling, drilling and grinding, for example. Machining processes can be applied to work metallic and non metallic materials such as polymers, wood, ceramics, composites and special materials. Today, in modern manufacturing engineering, there has been strong renewed interest in high efficiency machining.