A study on machining characteristics of nickel-based alloy with short electric arc milling

et al. 2021

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In this study, characteristics of Ti6Al4V alloy are studied by pulse short electric arc milling (SEAM). In this regard, the in uence of SEAM parameters on the material removal rate (MRR), relative electrode wear rate (REWR) and surface integrity of Ti6Al4V is studied. A wide variety of processing parameters, including different voltages, frequencies, duty cycles, ushing pressures, electrode rotation speeds and electrode feed rates are considered in the investigation. Scanning electron microscope (SEM), energy dispersive spectrograph (EDS) and micro-hardness analysis are applied to analyze results. Moreover, a multichannel data acquisition system is used to measure gap voltage and gap current. Obtained results cover the variation of MRR, REWR, surface roughness (Ra), average re-solidi ed layer thickness and average heat-affected zone thickness with different processing parameters. Furthermore, the electrode surface morphology and chemical composition of the negative growth of REWR are studied. Based on the obtained results, the microstructure of the re-solidi ed layer and heat-affected zone of the workpiece cross-section is con rmed. This study provides a technological basis for the high-quality pulse SEAM technology of di cult-to-machine (DTM) materials to enter the semi-nishing eld.

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Section: Surface Morphology Analysis Of the Ti6al4vmentioning

confidence: 91%

Investigating the pulse short electric arc milling of Ti6Al4V alloy

Zhang

et al. 2021

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“…Zhou et al [10] proposed an improved advanced manufacturing method-modulated short electric arc machining (M-SEAM) to solve the problem of low machining e ciency and high speci c energy consumption of the di cult-to-machine materials in conventional EDM and EAM processes, which signi cantly increased the MRR and reduced the RTWR and SEC. Chen et al [11] studied the machining of GH4169 by short arc pulse power. They further revealed the machining mechanism by analyzing the surface morphology and chemical composition changes.…”

Section: Introductionmentioning

confidence: 99%

Milling performance of Ti2AlNb by DC short electric arc machining based on different electrode materials

Yin

Chen

et al. 2023

In this paper, a novel e cient and sustainable electrical discharge machining method, referred to as short electric arc machining (SEAM), is proposed to solve the problems of low e ciency, severe tool wear, and high cost of Ti2AlNb machining by traditional methods. The mechanism of SEAM with different voltages and tool electrode materials (W70Cu30, high-purity graphite, copper-plated graphite, and 304 stainless steel) is studied using a DC power supply, and the workpiece material removal rate (MRR), surface roughness (Sa), and relative tool wear rate (RTWR) are analyzed. In addition, the surface morphology, cross-sectional morphology, elemental distribution, and microhardness of Ti2AlNb after processing are investigated. The experimental results show that under 28 V, the W70Cu30 electrode achieves the highest MRR of 2571 mm 3 /min, which is higher than that of the other three electrode materials. It has also the lowest RTWR of the electrode and a relative electrode loss of only 0.0974%. The lowest surface roughness and heat affected layer of the workpiece after machining are 53.2 µm and 56.54 µm, respectively. The absolute difference of the width of the cross-section of the workpiece is the smallest, and the hardness of the recast layer of the workpiece is close to the hardness of the base metal, which is conducive to further processing. the thickness of the workpiece heat affected layer after machining with copper-plated graphite and 304 stainless steel electrodes is 64.6 µm and 72.4 µm, respectively.(5) The EDS analysis shows that after SEAM, a large amount of carbon, oxygen, and metal elements adheres to the workpiece surface, which indicates that after carburization and oxidation of the workpiece material, the tool electrode material and the conductive medium occur. The surface hardness of the workpiece machined by both high-purity graphite and copper-plated graphite electrodes signi cantly increases. Finally, the hardness values gradually decrease with the increase of the surface depth.

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Milling performance of titanium alloy based on short electric arc machining with direct current power source

Liu

et al. 2020