Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt

Amorim, Fred L.; Weingaertner, Walter Lindolfo; Bassani, Irionson Antonio

doi:10.1590/s1678-58782010000500009

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…Figures 2(a) and 2(c) show that MRR increases with the increase in pulse-on time and current, which is similar to the findings of previous literature [17,29]. MRR increases with the increase in current and pulse-on time because of the generation of high temperature between the electrodes, which can result in excessive melting and evaporation of the material out of the workpiece surface.…”

Section: One-variable-at-a-time Approachsupporting

confidence: 88%

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

Singh

Sharma

2016

Front. Mech. Eng.

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Electrical discharge machining (EDM) is a well-known nontraditional manufacturing process to machine the difficult-to-machine (DTM) materials which have unique hardness properties. Researchers have successfully performed hybridization to improve this process by incorporating powders into the EDM process known as powder-mixed EDM process. This process drastically improves process efficiency by increasing material removal rate, micro-hardness, as well as reducing the tool wear rate and surface roughness. EDM also has some input parameters, including pulse-on time, dielectric levels and its type, current setting, flushing pressure, and so on, which have a significant effect on EDM performance. However, despite their positive influence, investigating the effects of these parameters on environmental conditions is necessary. Most studies demonstrate the use of kerosene oil as dielectric fluid. Nevertheless, in this work, the authors highlight the findings with respect to three different dielectric fluids, including kerosene oil, EDM oil, and distilled water using one-variable-at-a-time approach for machining as well as environmental aspects. The hazard and operability analysis is employed to identify the inherent safety factors associated with powder-mixed EDM of WC-Co.

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Section: One-variable-at-a-time Approachsupporting

confidence: 88%

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

Singh

Sharma

2016

Front. Mech. Eng.

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“…As output performance variables the WC-Co workpiece circularity and surface roughness Sa (average height of selected area) were evaluated. A negative polarity was used to the electrode (cathode) and the WC-Co workpiece as the anode, due to the high percentage of WC ceramic phase in the WC-Co alloy, which would inhibit the emission of primary electrons that are responsible to start the ionization process and to accelerate the dielectric voltage breakdown, and then faster create the plasma channel 6 . The values of duty factor τ (t i / t i + t o ) was progressively reduced from the rough to finish regime (0.64 to 0.11), providing adequate flushing condition of debris away from the working gap, by setting a longer value for interval time t o .…”

Section: Methodsmentioning

confidence: 99%

“…Discharge energy (W e ≈ u e .i e .t e [mJ], where u e is the discharge voltage, i e is the discharge current, t e is the discharge durantion) used in working gap is the main ED-machining factor responsible to process performance in terms of material removal rate V w [mm 3 /min], volumetric relative wear ϑ (ϑ = electrode wear rate [mm 3 /min]/material removal rate [mm 3 /min]) , workpiece surface integrity and cavity geometrical characteristics 6 . Duszová et al 7 evaluated EDM parameters conditions for machining WC-Co using CuW (70%W and 30%Cu) electrodes in different ED-machining regimes, searching for improved data for volumetric relative wear ϑ, material removal rate V w and surface roughness R a .…”

Section: Introductionmentioning

confidence: 99%

On Geometrical Characteristics of WC-Co Round Cavities After ED-Machining with Different Grades of CuW Electrodes

et al. 2020

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Cemented carbides (WC-Co) are difficult to be processed by conventional machining processes. Electrical discharge machining (EDM) appears as an efficient technology to manufacture WC-Co products with high accuracy. In EDM literature no research works investigating the influences of different grades of CuW electrodes on geometrical characteristics when ED-machining the same cemented carbide was found. This work presents an investigation on ED-Machining of cemented carbide (WC-Co) with 10% Co using two grades of coper-tungsten (CuW) electrodes with 65% and 85% of tungsten. ED-Machining experiments were carried out under rough, semifinish and finish regimes with input variables discharge current i e , discharge duration t e and pulse interval time t o using analysis of variance (ANOVA) based on design of experiments with complete factorial 3 2. Output variables evaluated were WC-Co workpiece geometrical characteristics 3D surface roughness and round cavities circularity measures. Results showed that ED-Machining regime is the most significant parameter on both WC-Co workpiece circularity and surface roughness measures. Electrodes grades CuW65 and CuW85 presented similar results on workpiece circularity and 3D surface roughness.

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“…This makes Nickel based materials less suitable for the mould and die making application [9]. Cemented tungsten carbide (WC-Co) is a hard material with its excellent hardness, wear resistance, good dimensional stability and high mechanical strength [10,11,12]. At present, approximately 50% of the manufacturing of this type of cemented carbides is used in machining applications, the number of alternative applications are: mining of metallic and non-metallic materials, construction, transport and drilling in oil and gas installations, metallic materials forming, structural components and as material for making tools in the field of forestry engineering.…”

Section: Properties and Applications Of Wc-co Composite Materialsmentioning

confidence: 99%

Machining of WC-Co Composites - A Review

Kataria¹,

Kumar²

2014

MSF

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This article aims to present a review on the machining of tungsten carbide-cobalt composite material. WC-Co based materials are extensively used where the demand for high performance materials exists because these have the distinguished set of properties such as high hardness, superior wear resistance, high mechanical strength and good dimensional stability. Due to these excellent properties, it serves most applications in the field of tool and die making. Machining of the WC-Co materials is very difficult with conventional machining processes and results in poor surface finish, low material removal rate, high machining cost. Among all non-conventional machining processes, thermal energy based processes such as Electrical discharge machining, Wire EDM are most widely used to machine these materials. The machining of WC-Co is also affected by various factors such as the cobalt content and grain size and presence of other carbides. This paper attempts to critically review all these aspects of the machining of WC-CO composites.

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Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt

Abstract: At present, due to their properties, the tungsten carbide-cobalt (WC-Co)

Cited by 12 publications

References 15 publications

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

On Geometrical Characteristics of WC-Co Round Cavities After ED-Machining with Different Grades of CuW Electrodes

Machining of WC-Co Composites - A Review

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