Study of burr formation and phase transformation during micro-milling of NiTi alloys
Communication avec acte
Date
2014Abstract
Micro-milling can be defined as milling with end mills smaller than 1 mm of diameter. The top-down approach from milling to micro-milling is often used to define cutting conditions. Unfortunately geometries either for the active part or the overall shape are quite different from conventional tools, leading to inexistent problems at the macro-scale, such as a larger cutting edge radius to uncut chip thickness ratio leading to ploughing effect. Moreover, micro-milling can be used on particular material such as shape memory alloys in biomedical domain which are difficult to machine. This study focuses on burr formation during shoulder milling for two biocompatible NiTi alloys: a martensitic NiTi (shape memory effect) and an austenitic one (pseudo-elasticity effect). Design of experiment is used to highlight the influence of various parameters (cutting parameters and material phases) on the burr formation in micro-milling NiTi alloys. Burrs were observed and measured using confocal, optical and electronic microscopy and tend to be as large as shoulders dimensions. Material phase transformation was also examined. Analysis of variance emphasizes that the larger the feed per tooth and the smaller the width of cut are, the smaller the top burr is. Cutting strategy leads to different burr shape: up-milling burrs have a large curvature, whereas down-milling burrs are slightly bent. An affected layer of about 10 μm has been observed for the austenitic NiTi. The proposed experimental approach give the opportunity to study burr formation in micro-milling, the machinability of alloys or superelastic NiTi shape memory and a qualitative explanation of burr formation has been developed.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureThis paper focuses on burr formation in micro-end milling of two Nickel-Titanium shape memory alloys (SMA), an austenitic and a martensitic NiTi. Phase transformation during machining was also examined. The experimental ...
-
Communication avec actePIQUARD, Romain; GILBIN, Alexandre; FONTAINE, Michaël; THIBAUD, Sébastien; DUDZINSKI, Daniel; D’ACUNTO, Alain (Czech Machine Tool Society, 2014)In order to model micro-milling cutting forces, a way is to apply a local model on discretized elements of the cutting edge and then summing on the whole edge to obtain the global cutting forces. This local model is usually ...
-
Communication avec actePIQUARD, Romain; GILBIN, Alexandre; FONTAINE, Michaël; DUDZINSKI, Daniel; THIBAUD, Sébastien; D’ACUNTO, Alain (Institut Français de Mécanique Avancée, 2014)Cet article présente des essais de micro-coupe orthogonale et oblique à partir de tournage sur un acier 40NiCrMo16. Les résultats obtenus démontrent l’influence du rayon d’acuité d’arête sur les efforts mesurés notamment ...
-
Study of the Influence of Cutting Edge on Micro Cutting of Hardened Steel Using FE and SPH Modeling Article dans une revue avec comité de lectureCHAABANI, Lobna; PIQUARD, Romain; ABNAY, Radouane; FONTAINE, Michaël; GILBIN, Alexandre; PICART, Philippe; THIBAUD, Sébastien; DUDZINSKI, Daniel; D’ACUNTO, Alain (MDPI, 2022-07)Micromachining allows the production of micro-components with complex geometries in various materials. However, it presents several scientific issues due to scale reduction compared to conventional machining. These issues ...
-
Article dans une revue avec comité de lectureCOZ, Gaël Le; PELTIER, Laurent; PIQUARD, Romain; LAHEURTE, Pascal; D’ACUNTO, Alain (Elsevier BV, 2022)The success of biomedical implantation is linked to osseointegration, depending on the mechanical loading of the bone interface. The large difference in stiffness between the host bone (30 GPa) and the usual implant ...