CFD simulation and optimize of LN2 flow inside channels used for cryoge nic machining: application to milling of titani um alloy Ti - 6Al - 4V
TypeCommunications avec actes
Cryogenic machining is seen as a possible solution to increase tool life and improve surface integrity of machined components, by efficiently removing the heat from the cutting zone. Unfortunately, most of the publications on this topic does not investigate properly the physical phenomena occurring inside the pipe connecting the tankto the cutting tools/nozzle. These phenomena will affect the cryogenic flow characteristics at nozzle outlet, thus the performance of the cryogenic machining. In this work, a CFD model is developed and applied to investigate the liquid nitrogen (LN2) flow inside the pipe connecting the reservoir to the cutting tool/nozzle. The results show that the effectiveness of the cooling process depends not only on the input flow parameters (pressure, velocity, temperature and gas/liquid fraction), but also on the pipe geometry.
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Thermomechanical analysis induced by interrupted cutting of Ti6Al4V under several cooling strategies LEQUIEN, Pierre; POULACHON, Gérard; OUTEIRO, José (Elsevier BV, 2018)Cryogenic machining has mainly investigated in continuous cutting. Therefore, there is a lack of knowledge on the application of this technology to interrupted cutting, such as in milling. This study aims to investigate ...
Hybrid experimental/modelling methodology for identifying the convective heat transfer coefficient in cryogenic assisted machining LEQUIEN, Pierre; POULACHON, Gérard; OUTEIRO, José; RECH, Joël (Elsevier, 2018)Cryogenic assisted machining has become a very popular method in the metal cutting industry, as it enables the cooling of a cutting zone for improving surface integrity or/and tool life without contaminating the machined ...
Process Mechanics and Surface Integrity Induced by Dry and Cryogenic Machining of AZ31B-O Magnesium Alloy OUTEIRO, José; ROSSI, Frédéric; FROMENTIN, Guillaume; POULACHON, Gérard; GERMAIN, Guénaël; BATISTA, Antonio (Elsevier, 2013)The corrosion resistance of magnesium alloys depends mainly on its surface integrity. Previous experimental studies have shown that machining can induces small (nano-scale) grain size, compressive residual stresses and ...
LAZOGLU, Ismaïl; POULACHON, Gérard; RAMIREZ, Christophe; AKMAL, Mohammad; MARCON, Bertrand; ROSSI, Frédéric; OUTEIRO, José; KREBS, Michael (Elsevier, 2017)Ti-6Al-4V is commonly used especially in aerospace and biomedical industries. This alloy is known as a difficult-to-cut material. Due to its poor thermal properties, the heat generated during machining processes traps near ...
BAIZEAU, Thomas; ROSSI, Frédéric; POULACHON, Gérard; OUTEIRO, José (Elsevier, 2016)Surface integrity prediction of hard machining using PCBN cutting tools remains a major topic for many high value added applications. A Flamant–Boussinesq (FB) analytical model has initially been applied for surface integrity ...