Machining of WC-Co Composites - A Review

Kataria, Ravinder; Kumar, Jatinder

doi:10.4028/www.scientific.net/msf.808.51

Cited by 19 publications

(11 citation statements)

References 39 publications

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“…The best way of creating custom surface textures is through laser ablation of WC-Co green compact inserts. Contrarily to sintered WC-Co, this method minimizes the problems of creating spatter, heat-affected zones, and microcracks, with the additional advantages of improving machining efficiency and reducing cost [21,42]. WC-10 wt.% Co green compacts inserts were pressed at Palbit S.A. company.…”

Section: Surface Micro-textures Implementationmentioning

confidence: 99%

Influence of Micro-Textures on Cutting Insert Heat Dissipation

et al. 2022

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Metal machining is one of the most important manufacturing processes in today’s production sector. The tools used in machining have been developed over the years to improve their performance, by reducing the cutting forces, the friction coefficient, and the heat generated during the cutting process. Several cooling systems have emerged as an effective way to remove the excessive heat generated from the chip-tool contact region. In recent years, the introduction of nano and micro-textures on the surface of tools has allowed to further improve their overall performance. However, there is not sufficient scientific data to clearly show how surface texturing can contribute to the reduction of tool temperature and identify its mechanisms. Therefore, this work proposes an experimental setup to study the tool surface characteristics’ impact on the heat transfer rate from the tools’ surface to the cooling fluid. Firstly, a numerical model is developed to mimic the heat energy flow from the tool. Next, the design variables were adjusted to get a linear system response and to achieve a fast steady-state thermal condition. Finally, the experimental device was implemented based on the optimized numerical model. A good agreement was obtained between the experimental tests and numerical simulations, validating the concept and the implementation of the experimental setup. A square grid pattern of 100 μm × 100 μm with grooves depths of 50, 100, and 150 μm was introduced on cutting insert surfaces by laser ablation. The experimental results show that there is a linear increase in heat transfer rate with the depth of the grooves relatively to a standard surface, with an increase of 3.77% for the depth of 150 μm. This is associated with the increase of the contact area with the coolant, the generation of greater fluid turbulence near the surface, and the enhancement of the surface wettability.

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Section: Surface Micro-textures Implementationmentioning

confidence: 99%

Influence of Micro-Textures on Cutting Insert Heat Dissipation

et al. 2022

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“…In this study, LAJECM machine is used for drilling holes in the WC-Co composite. WC-Co possesses high hardness, superior toughness, high abrasion resistance and good dimensional stability (Kataria and Kumar, 2015b). WC-Co has found a wide range of applications in the industry for the manufacturing of various parts and components (Kataria et al , 2016d).…”

Section: Experimental Planning and Optimizationmentioning

confidence: 99%

Optimization of laser-assisted jet electrochemical machining parameters by grey relational analysis and fuzzy logic

Malik

Sanghvi

2021

WJE

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Purpose The purpose of this paper is to optimize the laser-assisted jet electrochemical machining parameters, namely, supply voltage, inter-electrode gap, duty cycle and electrolyte concentration during machining of WC-Co composite using grey relational analysis and fuzzy logic. Design/methodology/approach In this work, experiments were carried out as per the Taguchi methodology and an L16 orthogonal array was used to study the influence of various combinations of process parameters on material removal rate, hole taper angle and surface roughness height. As a dynamic approach, the multiple response optimization was carried out using grey relational analysis and fuzzy logic. Findings The process parameters were optimized using grey relational analysis and fuzzy logic for different machining conditions such as balanced manufacturing, high-speed manufacturing and high-quality manufacturing. The research documented in this paper can be scaled up for case studies regarding industrial applications to compare optimization methods for manufacturing processes that are already being carried out. Originality/value An attempt to optimize material removal rate, hole taper angle and surface roughness height together by a combined approach of grey relational analysis and fuzzy logic has not been previously done.

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“…Based on the literature review on the machining of WC-Co hardmetals, it was concluded that the issues related to the EDM of WC-Co could be attributed to differences in physical properties such as melting and evaporation temperatures, thermal expansion and contraction coefficient and electrical conductivity. 5 EDM is based on high-voltage electrical 1 Norm Fasteners San. ve Tic.…”

Section: Introductionmentioning

confidence: 99%

Wire-EDM cutting strategies of WC-Co hardmetals: Effect of number of EDM pass on surface integrity

Toparli

2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, the effect of the number of wire-EDM passes on the surface integrity of WC-Co hardmetals was investigated. As-received doughnut-shaped WC-25 wt%Co samples were wire EDM’ed with one, two, three and five passes. The resulting surface conditions were investigated in terms of macroscopic and microscopic examinations. Surface roughness and hardness measurements were carried out. Detailed SEM investigations were coupled with EDS analyses. Based on the experimental findings, a detailed cutting strategy was offered for WC-Co hardmetals depending on the expectations of surface conditions, production route, cost and productivity. If there is at least one subsequent process including material removal, wire-EDM with one pass is suggested to decrease cost and increase productivity. However, heat-affected zone (HAZ), recast layer and lower surface hardness region should be removed at subsequent production steps. If there are no production steps to remove HAZ, recast layer and lower surface hardness region, the number of wire-EDM passes should be maximised.

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Machining of WC-Co Composites - A Review

Cited by 19 publications

References 39 publications

Influence of Micro-Textures on Cutting Insert Heat Dissipation

Influence of Micro-Textures on Cutting Insert Heat Dissipation

Optimization of laser-assisted jet electrochemical machining parameters by grey relational analysis and fuzzy logic

Wire-EDM cutting strategies of WC-Co hardmetals: Effect of number of EDM pass on surface integrity

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