Cryogenic assistance during CFRP drilling
TypeCommunications avec actes
The CFRP cutting mechanisms are highly linked to fibers orientations. Firstly, this paper deals with a mechanical characterization of CFRP under cryogenic temperatures. An instrumented compressive test with fibers oriented at 45° regarding the crushing direction has been conducted ranging from -196°C to 20°C to follow the evolution of the failure stress of the epoxide resin. Secondly, a semi-orthogonal radial turning experiment on unidirectional CFRP (T800M21 UD) disc with and without cryogenic assistance has been performed. As the fibers are oriented perpendicular to the spinning axis, on one turn, the tool cuts all the fibers with angles varying from 0° to 360°. During these specific tests the cutting forces have been monitored to characterize the cutting forces evolution versus fiber orientation. The experiment showed that cryogenic machining increases cutting forces but decreases surface roughness compare to dry machining.
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POUTORD, Antoine; ROSSI, Frédéric; POULACHON, Gérard; M'SAOUBI, Rachid; ABRIVARD, Guillaume (Congrès Français de Mécanique (21; 2013; Bordeaux), 2013)In aerospace applications, drilling is one of the most common operations. However, this machining stays complex and expensive, especially in hard to cut materials. Because of the closed aspect of the operation, the measure ...
BAIZEAU, Thomas; CAMPOCASSO, Sébastien; FROMENTIN, Guillaume; ROSSI, Frédéric; POULACHON, Gérard (Elsevier, 2015)In the case of hard machining of steels, negative rake tools generate compressive deformation and high temperature under the cutting edge, leading to phase transformation or ”white layers”. The resulting surface integrity ...
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 ...
POULACHON, Gérard; OUTEIRO, José; RAMIREZ, Christophe; ANDRÉ, Victorien; ABRIVARD, Guillaume (Elsevier, 2016)This paper deals with the hole surface quality when CFRP drilling. Mechanical instrumented operations have enabled to follow precisely the damage on the tool margins and the main cutting edges. The amount of uncut fibers ...
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 ...