March 2024
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20 Reads
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March 2024
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20 Reads
September 2023
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96 Reads
Mathematics
The folding process is characterized by the springback phenomenon. Several experimental folding tests are elaborated and illustrated in this paper. The precision and the quality of the folded sheet workpiece are related to the reduction in the springback phenomena. For that, two tools are designed and used for the folding process. An accurate design of the folding tool plays a significant role in contributing to the folding process and reducing potential defects related to springback. An experimental solution is presented to avoid the forming of defaults and compensate the workpiece springback after its removal from the die. Moreover, an accurate numerical modeling enables an efficient prediction of the springback. This allows us to obtain precise parts through the folding process. For that, a modified Johnson-Cook model is implemented on ABAQUS software in order to predict the folding force and the springback in a U-die folding process. In addition to the isotropic hardening law, a nonlinear kinematic hardening rule is used. To ensure the model's accuracy and reliability, we conducted validation experiments. The model's predictions are compared with experimental tests to show its capability to simulate the folding process effectively. The developed mechanical model can adequately predict and analyze springback effects and folding force evolution, helping designers compensate for them and achieve the desired final shape.
September 2023
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58 Reads
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3 Citations
Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture
Design of experiments is a statistical approach from which an optimized number of experiments is determined. Taguchi design of experiments, applied on Erichsen tests, is chosen to be considered in this paper. The most important parameters in this forming process, Erichsen index ( IE), and maximum generated force ( F max ), are experimentally and theoretically determined. Three input factors are selected, at diverse levels, in order to study their influence on Erichsen output results. The considered input factors are sheet thickness, punch diameter, and friction coefficient. New mathematical models which take into account the effects of these factors and their interactions are developed. Moreover, the influence of Erichsen test on the S235 steel microstructural behavior is experimentally examined as function of the sheet thickness. A good agreement between experimental and theoretical findings proves that the proposed models provide a precise prediction and an exact estimation of the Erichsen output parameters ( IE and F max ). The efficiency of the adopted design of experiments via Taguchi method is well confirmed.
June 2022
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13 Reads
Ce mémoire de stage de fin d’études, s’inscrit dans le cadre de la collaboration entre le département de Génie Mécanique de l’Institut Supérieur des Etudes Technologiques de Sfax et la Société Engineering and Machining Precision « EMP ». L’objectif de notre travail est d’étudier, concevoir et réaliser une machine de compactage de copeaux d’aluminium. Cette machine nous permet de rendre le copeau sous formes de briquettes bien compactées contenant un petit pourcentage d’oxygène pour éviter sa brulure lors de sa fusion pendant le recyclage. Pour cela, une analyse fonctionnelle est établie permettant le choix des solutions adéquates. Un dossier technique complet enveloppe tous les plans de fabrication des différentes pièces. Ensuite, un calcul théorique est établi afin de choisir et dimensionner les éléments principaux de la machine. Finalement, nous avons abouti à la réalisation de la machine.
June 2022
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681 Reads
Ce Projet de fin d’études s’inscrit dans le cadre de la collaboration entre le département de Génie Mécanique de l’Institut Supérieur des Etudes Technologiques de Sfax et la Société Engineering and Machining Precision « EMP ». L’objectif de ce travail est d’étudier, concevoir et réaliser une machine de compactage de copeaux d’aluminium, cette machine permet de compacter les copeaux d’aluminium obtenus pas usinage et de les rendre sous formes de briquettes bien compactées contenant un petit pourcentage d’oxygène afin d’éviter la combustion de l’aluminium lors de la fusion pendant le recyclage. Une analyse fonctionnelle est établie permettant le choix des solutions adéquates, un dossier technique complet enveloppe tous les plans de fabrication des différentes pièces et un calcul théorique est établi afin de choisir et dimensionner les éléments principaux de la machine.
June 2022
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139 Reads
Ce mémoire de fin d’étude intitulé « Etude , conception et fabrication d'une presse à balle »,s’inscrit dans le cadre de la collaboration du département de Génie Mécanique de l’Institut Supérieur des Études Technologiques de Sfax avec la société Plastic SIPA sud. Cette dernière cherche à diminuer l’encombrement de ses déchets en polyéthylène. Pour ce là elle nous demande de trouver les solutions technologiques pour réaliser une presse à balle. Après une analyse et une étude fonctionnelle du besoin, nous arrivons à choisir une solution adéquate. Ensuite nous avons étudié et conçu notre solution, déjà choisie, en s’appuyant sur des calculs et des théories bien déterminés. Enfin nous arrivons à réaliser notre machine Presse à balle.
December 2021
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3 Reads
The stamping process of the sheets requires the determination of the mechanical characteristics of the latter as well as its behavior. In this study, we developed a procedure to identify the effect of temperature in the cutting operation on the behavior of the sheet. This procedure is based on conventional tensile tests on the specimens, in cold-rolled sheet called DC01. They are cut in different orientations depending on the direction of rolling and with two different processes. We use laser cutting and robot wire cutting. The analysis of the tensile tests therefore makes it possible to determine the parameters related to the anisotropy of the sheet and the impact of temperature on the mechanical characteristics of the material.
December 2020
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8 Reads
The objective of this invention is to propose a technological solution in order to minimize the production time and to automate the feeding of the furnace by waste and obsolete parts in order to reuse them in shell molding. Our task is to find a solution for sorting the product ejected by the die-casting machine and feeding the waste into the furnace without operator intervention.
... In contrast to forming processes [1][2][3], where the purpose is to deform plastically the metal without fracture, metal cutting processes lead to the total rupture of the workpiece [4,5]. Different experimental and numerical analyses were carried out in order to determine optimal manufacturing parameters. ...
September 2023
Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture