Effect of mechanical pre-treatments in the behaviour of nanostructured PVD-coated tools in turning

Fernández-Abia, A.I.; Barreiro, J.; Lacalle, Luís Norberto López de; González-Madruga, D.

doi:10.1007/s00170-014-5844-1

Cited by 34 publications

(19 citation statements)

References 19 publications

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“…The geometry and hardness of the abrasives produce textures that mark the surface of the stripped substrate to a certain depth and are related to the angle of impact, in our case 90 • , and the hardness difference between the abrasive and the substrate. The depth of these marks, their distribution, and shape are consistent with the type of abrasive used in other works [34][35][36].…”

Section: Surface Roughnesssupporting

confidence: 87%

Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials

et al. 2020

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Polytetrafluoroethylene (PTFE) coatings are used in many applications and processing industries. With their use, they wear out and lose properties and must be replaced by new ones if the cost of the element so advises. There are different stripping techniques, but almost all of them are very difficult and require strict environmental controls. It is a challenge to approach the process through efficient and more sustainable techniques. In the present work, we have studied the stripping of PTFE coatings by projection with abrasives (1 step) as an alternative to carbonization + sandblasting procedures (2 steps). For this purpose, different types of abrasives have been selected: brown corundum, white corundum, glass microspheres, plastic particles, and a walnut shell. The tests were performed at pressures from 0.4 to 0.6 MPa on PTFE-coated aluminium substrates of EN AW-5182 H111 alloy. Stripping rates, surface roughness, and substrate hardness have been studied. Scanning electron microscopy (SEM) images of sandblasted specimens have also been obtained. All abrasives improved mechanical and surface properties in one-step vs. two-step processes. The abrasives of plastic and glass microspheres are the most appropriate for the one-step process, which increases the hardness and roughness level Ra in the substrate. Corundum abrasives enable the highest stripping rates.

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Section: Surface Roughnesssupporting

confidence: 87%

Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials

et al. 2020

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“…The number and size of the macroparticles depend mainly on the parameters of deposition as well as on the deposited material. Based on [28,29], the post-treatment of the coating is crucial to avoid droplets, which are the main cause of coating failure. Thus, a PVD coated punch was polished to remove them (Figure 7b).…”

Section: Punch With Ticn-mp Coatingmentioning

confidence: 99%

“…The decrease of roughness after the coating also had been found by [18] when TiAlCrN was applied. Based on [28,29], the coated punch was polished to remove droplets after the coating process. The friction coefficient measured by the Pin-On disc test decreased from 0.78 to 0.495 when the load increased.…”

Section: Disscusionmentioning

confidence: 99%

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

Tomáš

Džupon

Evin

et al. 2018

Metals

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This paper researches the surface condition and wear on the hole-flanging punch when producing a flanged Ø7 mm hole in a steel strip S355J2 + N (1.0577) with a thickness of 3 mm. The hole was flanged by a punch with a defined geometry known as a tangent ogive and described via a caliber radius head (CRH) ratio. During the process, wear of the punch made of hardened tool steel 1.3343 appeared after 20,000 strokes. Thus, a multipurpose coating TiCN-MP deposited via Lateral Rotating Arc-Cathode technology was applied on the punch to extend the punch lifetime. The coated punch was polished to remove droplets after deposition process. By applying TiCN-MP coating, 120,000 strokes were applied to reach the same wear as for the uncoated tool steel. The surface of the punch made of the hardened tool steel for uncoated and PVD coated conditions was researched by scanning electron microscopy after wear, and an energy dispersive X-ray (EDX) analysis was done to identify components of bonded material. In addition, the normal pressure on the punch active surface was studied via a numerical simulation of the hole-flanging process. The position of the high normal pressure is well correlated to the position of the adhesive wear for the uncoated and coated punches.

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“…Coating layer technologies are generally used to improve surface hardness, wear strength, thermal resistance, contact friction, with applications in the cutting tool and gas turbine industry [1][2][3][4][5][6]. Since mainly impulsive, high surface contact forces are expected to be applied to cutting tool components, coating toughness is a major requirement.…”

Section: Introductionmentioning

confidence: 99%

“…Plasma Vapour Deposition (PVD) techniques and Chemical Vapour Deposition (CVD) techniques are mainly used in this context [3], generating high residual stresses at the interface between the coating layer and the substrate. In operating conditions, the combination of residual and working load generated stresses can produce coating peeling and surface cracks [2] that compromise the effectiveness of the coating treatment. Coating toughness and maximization of the coating adhesion properties are also a major requirement in other mechanical contexts such as Micro Electro-Mechanical Systems (MEMS) devices, where mainly large flexural displacements and strains, and by consequence high surface stresses, are expected [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation and Modeling of the Damping Properties of Multi-Layer Coated Composites

2018

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Abstract:In this work, the dissipative properties of different coating solutions are compared and a beam mechanical model, taking into account of dissipative actions at the interface between different layers is proposed. The aim is to find optimal coatings to be employed in the production of composites with high damping properties. The investigated coating layers are obtained from different materials and production processes, and are applied on different metallic substrates. The composite specimens, in the form of slender beams, are tested by means of forced excitation dynamic measurements. Force and displacement experimental data, in a wide range of excitation frequencies, are used to estimate the system damping properties. Homogeneous, uncoated specimens are also tested for comparison. A specific identification procedure is used to identify the specimens stress-strain relationship in the frequency domain. The ratio of the imaginary part and the modulus of the specimen estimated complex frequency response function is considered as a measurement of the damping behaviour. A modified third order multi layered beam model, based on the zig-zag beam theory, is proposed. The model takes into account the contribution to the damping behaviour of the frictional actions and slipping at the interface between layers. Frictional actions are modelled by means of a complex, elasto-hysteretic contribution.

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Effect of mechanical pre-treatments in the behaviour of nanostructured PVD-coated tools in turning

Cited by 34 publications

References 19 publications

Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials

Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials

Surface Analysis of Uncoated and PVD Coated Punch at the Hole-Flanging Process

Experimental Evaluation and Modeling of the Damping Properties of Multi-Layer Coated Composites

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