Laser machining of WC-Co green compacts for cutting tools manufacturing

Guimarães, Bruno; Figueiredo, Daniel; Fernandes, C.M.; Silva, Filipe; Miranda, G.; Carvalho, Ó.

doi:10.1016/j.ijrmhm.2019.03.018

Cited by 20 publications

(3 citation statements)

References 27 publications

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“…WC-10 wt.% Co green compacts inserts were pressed at Palbit S.A. company. The surface micro-textures were created by laser surface texturing, using an Nd: YAG laser, being the square grid pattern produced in accordance with the work previously reported in the literature [43]. The green inserts were then post-dewaxing and sintering, according to Palbit S.A. specifications [43].…”

Section: Surface Micro-textures Implementationmentioning

confidence: 99%

“…The surface micro-textures were created by laser surface texturing, using an Nd: YAG laser, being the square grid pattern produced in accordance with the work previously reported in the literature [43]. The green inserts were then post-dewaxing and sintering, according to Palbit S.A. specifications [43]. In Figure 6, the images of four sintered WC-Co inserts, model CNMG 120408-GS are presented, and the respective magnified view of the surface micro-textures.…”

Section: Surface Micro-textures Implementationmentioning

confidence: 99%

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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%

Section: Surface Micro-textures Implementationmentioning

confidence: 99%

Influence of Micro-Textures on Cutting Insert Heat Dissipation

et al. 2022

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“…The various authors have carried out work to identify the optimized parametric conditions. Guimaraesa et al [4] investigated the work on laser machining of WC-Co green compacts by varying the parametric combinations for different cutting profiles. They defined the optimized parameters such as cutting speed of 128 mm/s, laser power 3 W, line spacing 0.08 mm, and passages 8 to improve the kerf edge quality.…”

Section: Introductionmentioning

confidence: 99%

Investigations on morphology and material removal rate of various MMCs using CO2 laser technique

Sharma

Kumar

Bist

2020

J Braz. Soc. Mech. Sci. Eng.

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The efficient machining of metal matrix composite becomes important factor with respect to the high strength and hardness properties. The presented research work observes the influence of CO 2 laser processing parameters on various metal matrix composite materials in terms of material removal rate (MRR). A comparison has been explored between various composite materials such as silicon carbide (SiC), aluminum oxide (Al 2 O 3), and zirconium oxide (ZrO 2) metal matrix composites for MRR. This results in novel research in context of MRR that examines the microstructure of machined work material. In the present study, to determine MRR various weighing evaluations and topography of machined surface were studied. The results indicated that the focal position, cutting speed and reinforced particles are the significant parameters for MRR. The morphological and metallurgical changes such as formation of recast layer have been analyzed using scanning electron microscope. The chemical composition of machined work materials and formation of new compound have been identified using EDS/XRD technique.

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