Characterization of the clamping and internal residual stresses effects on the distortion of Inconel 718 parts resulting from turning
Communication avec acte
The understanding of phenomena related to machining processesintheaerospace industry isstill the subject of study intheresearch community. This is due to the constrained geometric tolerances to ensure optimal performance and safety. Few studies have yet focused on the effect of the clamping sequence on part distortions during the machining process. Thus, the development of machining sequences, in particular the positioning of clamping points, still requires optimisation regarding the geometry to be machined. This contribution focuses on a first step of a study that aims to characterize workpiece distortions resulting from a multi-stageprocess in relation tothe clamping, cutting forcesand the initial ormachining induced stresses. To validate the approach, an insitu methodology for characterising the defects has been developed alongside a particular workpiece holder based on an industrial procedure is set up in order to observe and limit the part distortion along the whole process.The machining sequence is divided into two machining stepsseparated by unclampingand clampingoperations. Frontal axisymmetric grooves are machined in turning on both sides of a thin Inconel718 elementary disks. These operations are subject to in situ measurement on bothside of the workpiece. A laser profilometer and laser point sensorsare usedbetween each pass and at each stage of the machining sequenceoperation. The collected data will beused in a next step to validate a numerical model that predicts the evolution of the distortions of the part during the entire machining process
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Machinability of inconel 718 during turning: Cutting force model considering tool wear, influence on surface integrity Article dans une revue avec comité de lectureTOUBHANS, Bastien; FROMENTIN, Guillaume; VIPREY, Fabien; KARAOUNI, Habib; DORLIN, Théo (Elsevier, 2020)Machining accuracy can be compromised by elastic workpiece deformation and subsurface residual stress introduction during cutting. In order to anticipate the impact of cutting forces and surface integrity evolutions on ...
Article dans une revue avec comité de lectureTOUBHANS, Bastien; VIPREY, Fabien; FROMENTIN, Guillaume; KARAOUNI, Habib; DORLIN, Théo (Society of Manufacturing Engineers, 2020)Machining thin workpieces is a challenging task as geometrical errors may result from the combination of several phenomena. Among these, elastic workpiece deformation and machining induced residual stresses may be predominant ...
A versatile approach, considering tool wear, to simulate undercut error when turning thin-walled workpieces Article dans une revue avec comité de lectureTOUBHANS, Bastien; VIPREY, Fabien; FROMENTIN, Guillaume; KARAOUNI, Habib; LORONG, Philippe (Springer Science and Business Media LLC, 2021)In-process workpiece elastic deflection is the major source of geometrical error when machining low-stiffness workpieces. It creates an undercut error which needs to be corrected by time-consuming and labour-intensive ...
Mechanistic cutting force model including the stress state induced by the chip flow contribution for cylindrical turning on Ti6Al4V alloy with two different nose radii Communication avec acteForce modelling is a major research topic in machining. Several approaches are used to face with the different needs. Mechanistic models appear to be an easier and rapid way for computing cutting forces; nevertheless they ...
Investigations on the flank wear and modelling of the contact radius effect in turning of Ti6Al4V titanium alloy Communication avec acteBONO, Aurélie; COSTES, Jean-Philippe; FROMENTIN, Guillaume; KARAOUNI, Habib; DORLIN, Théo (Elsevier, 2016)Machining of difficult-to-cut materials like Ti6Al4V titanium alloy leads to significant flank wear on the cutting tool. In order to ensure the respect of final part specifications, flank wear has to be controlled. In ...