Influence of the cutting edge preparation method on characteristics and performance of PVD coated carbide inserts in hard turning

Denkena, Berend; Köhler, Jens; Breidenstein, Bernd; Abrão, Alexandre Mendes; Ventura, Carlos Eiji Hirata

doi:10.1016/j.surfcoat.2014.07.003

Cited by 42 publications

(13 citation statements)

References 18 publications

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“…abrasive removal of material) [18][19][20][21]. In this regard, knowledge about substrate-related effects, in terms of either microstructure or surface finish, on the indentation response of coated hardmetals is quite limited [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides

Yang

Odén

Johansson-Jöesaar

et al. 2016

Wear

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The cracking and delamination of TiN-coated hardmetals (WC-Co cemented carbides) when subjected to Brale indentation were studied. Experimental variables were substrate microstructure related to low (6 wt% Co) and medium (13 wt% Co) binder content, and surface finishes associated with grinding and polishing stages before film deposition. Brale indentation tests were conducted on both coated and uncoated hardmetals. Emphasis has been placed on assessing substrate microstructure and subsurface finish effects on load levels at which cracking and delamination phenomena emerge, the type of cracking pattern developed, and how fracture mechanisms evolve with increasing load. It is found that polished and coated hardmetals are more brittle (radial cracking) and the adhesion strength (coating delamination) diminishes with decreasing binder content. Such a response is discussed on the basis of the influence of intrinsic hardness/brittleness of the hardmetal substrate on both cracking at the subsurface level and effective stress state, particularly regarding changes in shear stress component. Grinding promotes delamination compared to the polished condition, but strongly inhibits radial cracking. This is a result of the interaction between elastic-plastic deformation imposed during indentation and several grinding-induced effects: remnant compressive stress field, pronounced surface texture and micro cracking within a thin altered subsurface layer. As a consequence, coating spallation prevails over radial cracking as the main mechanism for energy dissipation in ground and coated hardmetals. (C) 2016 Elsevier B.V. All rights reserved.

Funding Agencies|Spanish MINECO [MAT 2012-34602]; Erasmus Mundus joint European Doctoral Programme DocMASE

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Section: Introductionmentioning

confidence: 99%

“…A ground variant is compared to a mirror-like polished one, the latter used here as reference condition. It is well-established that thermal and mechanical loads in grinding of hardmetal tools induce surface integrity alterations [21,[28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides

Yang

Odén

Johansson-Jöesaar

et al. 2016

Wear

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Funding Agencies|Spanish MINECO [MAT 2012-34602]; Erasmus Mundus joint European Doctoral Programme DocMASE

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“…Effects of process steps carried out prior to measurement of residual substrate stresses in cemented carbides. The results were obtained using X-ray diffraction [19].…”

Section: Magnitude and Type Of Residual Stressesmentioning

confidence: 99%

Properties and Testing of Cemented Carbides

Kříž¹,

Bricín²

2017

Powder Metallurgy - Fundamentals and Case Studies

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This chapter deals with selected properties of cemented carbides and their testing. It consists of three main sub-chapters. The first one covers the degradation processes associated with grinding of cemented carbides. Among those, the focus is on the effects of thermal loads and reactions with the environment-the atmosphere. The second main sub-chapter describes the origin of residual stresses and their impact on cemented carbide properties. Finally, the third main sub-chapter explores the corrosion of cemented carbides in various environments. The choice of these topics was inspired by the impression that many users have of cemented carbides: indestructible materials in which no degradation takes place either during the production of cutting tools or during their use. As evidenced by the authors' experience described below, which has been acquired over many years in the field, damage in cemented carbides is a very frequent occurrence. Despite that it still receives very little attention, and especially the damage in cemented carbide cutting tools tends to be ascribed to various other factors, such as the applied coatings, the cutting process conditions and the material of the workpiece.

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“…In comparison, a tool with a variable cutting edge can form a spatially curved edge and therefore improve the thermolysis of the chip removal and tool life, reducing the cutting resistance. Such merits have drawn the attention from concerned scholars, and have been preliminary explored regarding tool fabrication techniques [25][26][27] and the cutting performance [28][29][30]. A PCBN tool with a variable chamfered edge was studied, and research into its wear morphology and mechanism was carried out based on a high-speed hard turning experiment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Wear Characteristics of PCBN Tool with Variable Chamfered Edge

Chen

Lixing

et al. 2019

Chin. J. Mech. Eng.

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Owing to heavy dynamic and thermal loads, PCBN tools are seriously worn during hard cutting, which largely constrains the improvement of their machining performance. Therein, the chamfered structure of a cutting edge has a notable influence on the tool wear. Thus, a comparative study was carried out on the wear morphology and wear mechanism of PCBN tools with either a variable chamfered edge or an invariable chamfered edge. The results indicate that, for a PCBN tool with a variable chamfered edge, the rake wear area is far from the cutting edge and slowly extends toward it. A shallow large-area crater wear occurs on the rake face, and the flank wear area has a long triangular shape with a smaller wear area and width, and the cutting edge remains in a good state during the cutting process. In contrast, for a PCBN tool with an invariable chamfered edge, a deep small-area crater appears on the rake face, and the wear area is close to the cutting edge and quickly extends toward it. Thus, it is easy for chips to accumulate in the crater, resulting in large-area and high-speed wear on the flank face. In addition, the tool shows a weak wear resistance. In the initial wear stage, the rake wear mechanism of the two cutting tools is a mixture of abrasive, oxidation, and other types of wear, whereas their flank wear mechanism is dominated by abrasive wear. With an aggravation of the tool wear, the oxidation and diffusion wear mechanism are both increasingly strengthened. The rake wear of the cutter with a variable chamfered edge showed an obvious increase in the oxidation and diffusion wear, as did the flank wear of the cutter with an invariable chamfered edge. This study revealed the wear mechanism of the PCBN tool with a variable chamfered edge and provided theoretical and technological support for its popularization and application in the machining of high-hardness materials.

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Influence of the cutting edge preparation method on characteristics and performance of PVD coated carbide inserts in hard turning

Cited by 42 publications

References 18 publications

Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides

Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides

Properties and Testing of Cemented Carbides

Experimental Study on Wear Characteristics of PCBN Tool with Variable Chamfered Edge

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