Analysis of behaviour biocompatible titanium alloy (Ti-6Al-7Nb) in the micro-cutting

Lauro, Carlos Henrique; Filho, Sérgio Luiz Moni Ribeiro; Brandão, Lincoln Cardoso; Davim, J. Paulo

doi:10.1016/j.measurement.2016.07.059

Cited by 49 publications

(22 citation statements)

References 32 publications

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“…An understanding of the interplay between tool wear, built-up edge, and surface quality for a given tool-work material pair is crucial for the successful application of the micro milling process. The work material is selected as titanium alloy Ti6Al4V due to its widespread use in practice [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Built-up edge effects on process outputs of titanium alloy micro milling

Oliaei

2017

Precision Engineering

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Built-up edge (BUE) is generally known to cause surface finish problems in the micro milling process. The loose particles from the BUE may be deposited on the machined surface, causing surface roughness to increase. On the other hand, a stable BUE formation may protect the tool from rapid tool wear, which hinders the productivity of the micro milling process. Despite its common presence in practice, the influence of BUE on the process outputs of micro milling has not been studied in detail. This paper investigates the relationship between BUE formation and process outputs in micro milling of titanium alloy Ti6Al4V using an experimental approach. Micro end mills used in this study are fabricated to have a single straight edge using wire electrical discharge machining. An initial experimental effort was conducted to study the relationship between micro cutting tool geometry, surface roughness, and micro milling process forces and hence conditions to form stable BUE on the tool tip have been identified. The influence of micro milling process conditions on BUE size, and their combined effect on forces, surface roughness, and burr formation is investigated. Long-term micro milling experiment was performed to observe the protective effect of BUE on tool life. The results show that tailored micro cutting tools having stable BUE can be designed to machine titanium alloys with long tool life with acceptable surface quality.

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Section: Introductionmentioning

confidence: 99%

Built-up edge effects on process outputs of titanium alloy micro milling

Oliaei

2017

Precision Engineering

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“…However, porous titanium alloys are recognized as difficult-to-cut materials due to their low thermal conductivity, high chemical activity and small elastic modulus [11][12][13]. The cutting process of porous titanium is that the shear slip of the workpiece occurs under the action of the cutting tool and the cutting chip flows out from the rack face of the cutter [14]. At the same time, the machining surface of the workpiece experienced the process of extrusion and friction, which occur in the flank face of the cutter [15,16].…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Constitutive Model for Porous Titanium Alloy at Various Strain Rates and Temperatures

Liu

Wang

et al. 2017

Metals

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Abstract:In this paper, the accurate description of the relationship between flow stress and strain of porous titanium alloys at various strain rates and temperatures were investigated with dynamic and quasistatic uniaxial compression tests for a further study on the processing mechanism of porous titanium material. Changes in their plastic flows were described through the one-dimensional Drucker-Prager (DP) constitutive model. Porous titanium alloys were micromilled in a DP simulation. After all parameters had been obtained in the DP model, the experimental and simulated true stress-strain curves and flow stress levels of two porous titanium alloys were compared to estimate the precision of the model. The findings were as follows. First, porous titanium alloys show deformation patterns characterized by pore collapse-induced deformation and have strong stress-hardening effects, but the patterns did not include noticeable plastic-flow plateaus. Second, porosity strongly affects the mechanical strength, strain-rate sensitivity, and temperature sensitivity of both alloys. Third, the DP model sufficiently describes the mechanical properties of both alloys at 25-300 • C and at strain rates of 1000-3000 s −1 , with a deviation of 10% or lower.

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“…Kistler ™ charge amplifier model 5019B. Figure 3 shows the experimental setup for the micro- The methodology to acquire and process the force signals during the orthogonal micro-cutting process, and to calculate the response, was based on Lauro et al [41]. The cutting force signal was acquired using a sampling rate of 4 kHz, acquisition time of 300 s, manually triggered.…”

Section: Methodsmentioning

confidence: 99%

“…(5)) was used. In this model, we observed a great response in order to identify the ploughing effect, when the angle is lower than 10° [ 41].…”

Section: Methodsmentioning

confidence: 99%

Behaviour of a biocompatible titanium alloy during orthogonal micro-cutting employing green machining techniques

Lauro

Brandão

Filho

et al. 2018

Int J Adv Manuf Technol

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The sustainability of a process is the objective of modern industries aiming to reduce waste in production, since consumers require high quality and efficiency with fair price. Thus, a good understanding of the process should be its starting point. The manufacture of dental implants is an example in which waste reduction is important for the reduction of prices due to the demand for great quality and accuracy. This study observed the behaviour of sustainable micro-cutting applied to the Ti-6Al-7Nb titanium alloy, considering the ploughing effect on minimum quantity lubrication (MQL) and high-speed machining (HSM) conditions. When compared with dry condition and low-speed cutting in orthogonal micro-cutting, the use of HSM in dry cutting was more efficient than using MQL. The dry condition presented lower surface roughness, whilst the cooled/lubricated condition presented lower burr formation.

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Analysis of behaviour biocompatible titanium alloy (Ti-6Al-7Nb) in the micro-cutting

Cited by 49 publications

References 32 publications

Built-up edge effects on process outputs of titanium alloy micro milling

Built-up edge effects on process outputs of titanium alloy micro milling

One-Dimensional Constitutive Model for Porous Titanium Alloy at Various Strain Rates and Temperatures

Behaviour of a biocompatible titanium alloy during orthogonal micro-cutting employing green machining techniques

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