In-process Measurement of the Coefficient of Friction on Titanium

Meier, Linus; Schaal, Nikolas; Wegener, Konrad

doi:10.1016/j.procir.2017.03.212

Cited by 26 publications

(11 citation statements)

References 13 publications

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“…A plethora of empirical models, which are all based on a power function, have already described this behavior. In a more recent investigation, Meier et al [11] conducted an in-process measurement of the friction coefficient in cutting titanium alloys and showed that the measured data is significantly affected by the tribometer setup. They proposed that choosing the most appropriate tribometer leads to values that are most representative of the situation in metal cutting.…”

Section: General Challenges In Metal Cutting Investigationmentioning

confidence: 99%

A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients

Afrasiabi

Saelzer

Berger

et al. 2021

Metals

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Numerical simulation of metal cutting with rigorous experimental validation is a profitable approach that facilitates process optimization and better productivity. In this work, we apply the Smoothed Particle Hydrodynamics (SPH) and Finite Element Method (FEM) to simulate the chip formation process within a thermo-mechanically coupled framework. A series of cutting experiments on two widely-used workpiece materials, i.e., AISI 1045 steel and Ti6Al4V titanium alloy, is conducted for validation purposes. Furthermore, we present a novel technique to measure the rake face temperature without manipulating the chip flow within the experimental framework, which offers a new quality of the experimental validation of thermal loads in orthogonal metal cutting. All material parameters and friction coefficients are identified in-situ, proposing new values for temperature-dependent and velocity-dependent friction coefficients of AISI 1045 and Ti6Al4V under the cutting conditions. Simulation results show that the choice of friction coefficient has a higher impact on SPH forces than FEM. Average errors of force prediction for SPH and FEM were in the range of 33% and 23%, respectively. Except for the rake face temperature of Ti6Al4V, both SPH and FEM provide accurate predictions of thermal loads with 5–20% error.

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Section: General Challenges In Metal Cutting Investigationmentioning

confidence: 99%

A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients

Afrasiabi

Saelzer

Berger

et al. 2021

Metals

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“…Therefore, the influence of any previously existing reaction layer on the workpiece is negligible. For titanium and less severe friction conditions, however, Meier et al (2017) showed significantly lower adhesion, and therefore, a lower coefficient of friction on oxidized titanium than on freshly generated surfaces.…”

Section: State Of the Artmentioning

confidence: 90%

“…Oxidation effects are greatly reduced and can even be neglected according to Olsson et al (1989) and Smolenicki et al (2014). Tribometers with the same working principle have also been built by Zemzemi et al (2007) and Meier et al (2017).…”

Section: State Of the Artmentioning

confidence: 99%

Modeling tool wear in titanium cutting with an in-process tribometer

Meier

Eglin²

2019

ILT

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Purpose Metalworking fluids can significantly increase the tool life in titanium cutting, however, full-scale cutting tests to determine the performance of metalworking fluid are expensive. The aim of this study is therefore to introduce a reliable and inexpensive alternative testing method. Design/methodology/approach A newly developed in-process tribometer allows emulating the sliding conditions of the chip formed in cutting as closely as possible. It uses a cutting action in front of a pin to eliminate the influence of the oxidation layer. To observe the wear pattern on the pin, adhering workpiece material is removed by selective etching. A high temperature oxidation test is used to study the wear mechanism. Findings The wear pattern on the pin correlates well with the wear pattern observed on cutting tools when using the same metalworking fluid while being much more cost-effective than a tool life test. The high temperature oxidation test reveals that cobalt leaching is causing notch wear. Research limitations/implications The correlation between pin and tool wear is verified for the case of roughing turning of titanium with cemented carbide tools and two metalworking fluids. Practical implications The method is applicable in an industrial context, potentially replacing the currently used tribological analyzes. Social implications Submitted in connection with the special issue “young tribologists – insights into the work of the new generation”. Originality/value Methods tailored to model the tool wear in titanium cutting are rare. For the first time, an in-process tribometer, which is especially suited for the analysis of titanium cutting, is used to assess the wear behavior. The design of the high temperature oxidation test is new. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0311

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“…However, in this case, the macro slipping does not occur at a constant load level so it is hard to assess the correct tangential load. Assuming a friction coefficient of 0.4 for titanium/titanium contact [10] and knowing the normal load from previous instrumented installation tests, equation ( 1) gives a tangential normalized load value of 0.19. This value is in the middle of the macro-slipping zone and thus appears coherent.…”

Section: Joints Without Friction Shimmentioning

confidence: 99%

Experimental and Numerical Investigations of Mechanical Behaviour for Titanium Bolted Joints with Friction Shim

Pichon

Daidié

Paroissien

et al. 2022

Advances on Mechanics, Design Engineering and Manufacturing IV

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The work presented here is an experimental and numerical study on a new technology called friction shims. Those are thin shim made of steel with a shape of washer. Their coating made of nickel and micro diamonds aim to increase the friction coefficient when located at the interface of two parts. The mechanical behaviour as well as the static and fatigue strengths of titanium bolted joints with this specific technology are presented in this study. Specimens are representative of hole-to-hole aeronautical joints, involving large clearance and misalignments. Specimen geometrical and material definition are presented as well as test set up. The experimental test results show limited impact on the static strength and a large increase in the fatigue strength. A numerical analysis based on the finite element method was developed and correlated with the experiments to provides complementary information and to understand the mechanical behaviour observed during the static tests and the gain in fatigue strength.

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In-process Measurement of the Coefficient of Friction on Titanium

Cited by 26 publications

References 13 publications

A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients

A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients

Modeling tool wear in titanium cutting with an in-process tribometer

Experimental and Numerical Investigations of Mechanical Behaviour for Titanium Bolted Joints with Friction Shim

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