moncef hbaieb - Academia.edu (original) (raw)
Papers by moncef hbaieb
The International Journal of Advanced Manufacturing Technology, 2014
ABSTRACT This paper presents a 3D formalization of manufacturing tolerancing which associates the... more ABSTRACT This paper presents a 3D formalization of manufacturing tolerancing which associates the concept of small displacements, the functional constraints, and manufacturing process capability. This approach would make it possible to establish relations which limit the surface variations of the production mechanism by the functional specifications. These relations have a number of requirements imposed by designer and are sufficient to evaluate the manufacturing process. The variations of the manufacturing process are defined in relation to variations measured by 3D measuring.
Dans le processus de fabrication en fraisage a grande vitesse ‘FGV’, l’etude de la reaction de la... more Dans le processus de fabrication en fraisage a grande vitesse ‘FGV’, l’etude de la reaction de la machine au cours de l’usinage est une tâche tres delicate et importante. En effet, l’identification du comportement de la machine necessite la modelisation de la loi de mouvement des axes et de la trajectoire reelle aux niveaux des discontinuites. Le nombre important de discontinuites engendrent une instabilite de la vitesse de deplacement des axes, ce qui implique une augmentation du temps d’usinage et un non respect de la vitesse d’avance programmee, se traduisant par des problemes de productivite et une sous-estimation du cout de l’usinage pour l’industriel. L'objectif recherche dans cette etude est l'identification du comportement de la machine lors de passage sur une discontinuite entre des interpolations lineaire et circulaire en combinaison quelconque, tous en respectant la valeur d’erreur imposee. Pour ce faire, une modelisation analytique de la vitesse d’avance avec con...
This article proposed a three-dimensional formalization of functional tolerance which associates ... more This article proposed a three-dimensional formalization of functional tolerance which associates with the definition according to the ISO standard of dimensional and geometrical functional specifications and the small displacements concept. The modelling of the principal tolerances conduces to express the relations which limit the deviations values of the tolerated entities and the datum by the tolerance interval value of the functional requirement. This modelling provides a geometrical tool which will be useful for the development of three-dimensional tolerance models and verifying the validity of manufacturing process.
The International Journal of Advanced Manufacturing Technology
In high-speed milling (HSM) of free-form surfaces, the tool path is mainly characterized by a set... more In high-speed milling (HSM) of free-form surfaces, the tool path is mainly characterized by a set of short discontinuous segments in tangency. These discontinuities bring an intense kinematic parameter fluctuation of the computer numerical control (CNC) machine axes. The smoothing of the programmed tool path and the optimal choice of the manufacturing process parameters ensure a high productivity with the required quality of the machined surfaces. Precise estimation of the machining time allows an accurate evaluation of the machined product cost. Thereby, this is achieved by studying the effect of the tool path smoothing and the CNC controller parameters on the axis kinematics and the following errors. This paper focuses on the geometrical modeling of the local smoothing block adopted by Sinumerik CNC. Further, a kinematic model is proposed to simulate the axis motion in linear interpolation mode with local smoothing. The identification of the interpolator reduction effect on the programmed tolerance leads to the identification of the smoothing model adopted by the CNC unit. Then, the axis kinematic behavior is modeled while taking into account the drive parameter axes defined by the manufacturer of the CNC unit. The experimental results showed a smooth variation of the axis feed rate along the smoothing blocks and a good correlation with the proposed models.
The International Journal of Advanced Manufacturing Technology, 2016
Computers and Electronics in Agriculture, 2015
ABSTRACT
Mechanics & Industry, 2015
The purpose of this research is to design and test a linkage pivot assembled by metal forming pro... more The purpose of this research is to design and test a linkage pivot assembled by metal forming process. The assembly is obtained by crimping a tubular component onto a cylindrical grooved component using an experimental instrumented device. The quality of the linkage pivot is evaluated by a pullout test which measures the force required to break or dismantle the assembly. The study is focused on analysing the effect of the main process parameter (i.e. the crimping depth) and geometrical parameters (i.e. the tubular component thickness and the groove radius). For one set of geometrical parameters, an appropriate crimping depth leading to the maximum assembly strength and assembly stiffness is determined. The study of the geometrical parameters shows that the tubular component thickness and the groove radius do not affect much the assembly strength. However, the tubular component thickness affects considerably the forming load, the assembly stiffness and the failure mode. According to the obtained results, one set of parameters that meets industrial requirements is selected to design the linkage pivot.
Soil and Tillage Research, 2013
ABSTRACT The efficiency of the tillage is measured by the power consumption or the tillage force ... more ABSTRACT The efficiency of the tillage is measured by the power consumption or the tillage force or draught and the quality of the worked soil. The tillage forces are mainly a function of soil mechanical properties, working parameters of the tool (e.g. depth and speed) and tool geometry. In this paper we report on the numerical modeling of soil tillage. The finite element method (FEM) was used to model the cutting process of the soil using a moldboard. The surface geometry of the moldboard was measured with a 3D touch probe bench, also called coordinate measuring machine, and these data were used to construct the shape with SolidWorks design software. An elasto-plastic constitutive model was used for the soil. The generated surface of the plow was imported to Abaqus software as a discrete rigid body with a reference point at the tip of the moldboard. At this tip the reaction force with its three orthogonal components was calculated. The impact of the cutting angle (angle between the horizontal generatrix and the tillage direction) and the lift angle (angle between the moldboard surface and the horizontal line in an orthogonal section to the cutting edge) on draught force was investigated. The optimal values of these angles are in agreement with experimental data from the literature.
Materials Technology: Advanced Performance Materials, 2008
Machining Science and Technology, 2013
& In the context of high-speed milling (HSM), during the machining process dynamic machine respon... more & In the context of high-speed milling (HSM), during the machining process dynamic machine response has to be identified. To achieve this, we have to calculate the feed rate evolution in linear and circular interpolation according to dynamic performance of machine. In addition to that, actual trajectory for transition passages between two interpolations must be estimated with take into account of specific machining tolerances. This article proposes a model of machine tool behavior for a tool path with linear and circular interpolations and machining cycle time prediction. The method involves subdividing the trajectories into elementary geometries according to the type of interpolation (circular or linear). At points where different trajectories meet, there is often a discontinuity in curvature or in tangency, which decreases the feed rate. At the points of discontinuity in tangency, a fillet radius is inserted. In this article, the influence of the geometry for elementary trajectories was determined. Then, the value of the fillet radius between linear and circular contours in different combinations was modeled. An industrial application was carried out in order to validate models and to determine the influence of feed rate evolution on the machining cycle time.
The International Journal of Advanced Manufacturing Technology, 2013
OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 8655
International Journal of Applied Research and Technology (1737-7463), 2019
One of the non-traditional machining processes is the electrical discharge machining "EDM". It re... more One of the non-traditional machining processes is the electrical discharge machining "EDM". It remains a widely used process in the manufacture of dies and molds. In this process, the material removal is occurred by a series of succeeding and non-stationary electrical discharges between the electrode and the work piece. These discharges are separated from each other in time. Machining parameters such as the pulse time "Ton", the rest time "Toff", the discharge current "I" and the electrical resistivity of the electrode material "Rho" have a major influence on the piece and the tool during machining. The material removal rate plays a very important role in the manufacturing domain as it decides on the time and ultimately the final cost. In this work we studied the interaction between these parameters and their effects on the material removal rate "MRR" then on the relative tool wear "Wr". The modeling through statistical methods using the method design of experiments showed concordance between the experimental results and those calculated.
Journal of Materials Processing Technology, 2011
ABSTRACT The effect of blank-holding on the hole-flanging process was investigated using numerica... more ABSTRACT The effect of blank-holding on the hole-flanging process was investigated using numerical and experimental analysis. Hole-flanging was performed with fixed blank-holder, without blank-holder, with constant blank-holding force and with progressive blank-holding force. Progressive blank-holding force was supplied by springs or preloaded springs. An elasto-plastic finite element model was used to predict the forming kinematics, the punch load and the final shape. A commercial sheet of aluminium alloy with a thickness of 2 mm was selected for this work. Experiments were conducted in order to verify the reliability of the developed elasto-plastic finite element model. The experimental results demonstrated that the finite element model can be used to determine the suitable blank-holding condition for each case.
The International Journal of Advanced Manufacturing Technology, 2014
ABSTRACT This paper presents a 3D formalization of manufacturing tolerancing which associates the... more ABSTRACT This paper presents a 3D formalization of manufacturing tolerancing which associates the concept of small displacements, the functional constraints, and manufacturing process capability. This approach would make it possible to establish relations which limit the surface variations of the production mechanism by the functional specifications. These relations have a number of requirements imposed by designer and are sufficient to evaluate the manufacturing process. The variations of the manufacturing process are defined in relation to variations measured by 3D measuring.
Dans le processus de fabrication en fraisage a grande vitesse ‘FGV’, l’etude de la reaction de la... more Dans le processus de fabrication en fraisage a grande vitesse ‘FGV’, l’etude de la reaction de la machine au cours de l’usinage est une tâche tres delicate et importante. En effet, l’identification du comportement de la machine necessite la modelisation de la loi de mouvement des axes et de la trajectoire reelle aux niveaux des discontinuites. Le nombre important de discontinuites engendrent une instabilite de la vitesse de deplacement des axes, ce qui implique une augmentation du temps d’usinage et un non respect de la vitesse d’avance programmee, se traduisant par des problemes de productivite et une sous-estimation du cout de l’usinage pour l’industriel. L'objectif recherche dans cette etude est l'identification du comportement de la machine lors de passage sur une discontinuite entre des interpolations lineaire et circulaire en combinaison quelconque, tous en respectant la valeur d’erreur imposee. Pour ce faire, une modelisation analytique de la vitesse d’avance avec con...
This article proposed a three-dimensional formalization of functional tolerance which associates ... more This article proposed a three-dimensional formalization of functional tolerance which associates with the definition according to the ISO standard of dimensional and geometrical functional specifications and the small displacements concept. The modelling of the principal tolerances conduces to express the relations which limit the deviations values of the tolerated entities and the datum by the tolerance interval value of the functional requirement. This modelling provides a geometrical tool which will be useful for the development of three-dimensional tolerance models and verifying the validity of manufacturing process.
The International Journal of Advanced Manufacturing Technology
In high-speed milling (HSM) of free-form surfaces, the tool path is mainly characterized by a set... more In high-speed milling (HSM) of free-form surfaces, the tool path is mainly characterized by a set of short discontinuous segments in tangency. These discontinuities bring an intense kinematic parameter fluctuation of the computer numerical control (CNC) machine axes. The smoothing of the programmed tool path and the optimal choice of the manufacturing process parameters ensure a high productivity with the required quality of the machined surfaces. Precise estimation of the machining time allows an accurate evaluation of the machined product cost. Thereby, this is achieved by studying the effect of the tool path smoothing and the CNC controller parameters on the axis kinematics and the following errors. This paper focuses on the geometrical modeling of the local smoothing block adopted by Sinumerik CNC. Further, a kinematic model is proposed to simulate the axis motion in linear interpolation mode with local smoothing. The identification of the interpolator reduction effect on the programmed tolerance leads to the identification of the smoothing model adopted by the CNC unit. Then, the axis kinematic behavior is modeled while taking into account the drive parameter axes defined by the manufacturer of the CNC unit. The experimental results showed a smooth variation of the axis feed rate along the smoothing blocks and a good correlation with the proposed models.
The International Journal of Advanced Manufacturing Technology, 2016
Computers and Electronics in Agriculture, 2015
ABSTRACT
Mechanics & Industry, 2015
The purpose of this research is to design and test a linkage pivot assembled by metal forming pro... more The purpose of this research is to design and test a linkage pivot assembled by metal forming process. The assembly is obtained by crimping a tubular component onto a cylindrical grooved component using an experimental instrumented device. The quality of the linkage pivot is evaluated by a pullout test which measures the force required to break or dismantle the assembly. The study is focused on analysing the effect of the main process parameter (i.e. the crimping depth) and geometrical parameters (i.e. the tubular component thickness and the groove radius). For one set of geometrical parameters, an appropriate crimping depth leading to the maximum assembly strength and assembly stiffness is determined. The study of the geometrical parameters shows that the tubular component thickness and the groove radius do not affect much the assembly strength. However, the tubular component thickness affects considerably the forming load, the assembly stiffness and the failure mode. According to the obtained results, one set of parameters that meets industrial requirements is selected to design the linkage pivot.
Soil and Tillage Research, 2013
ABSTRACT The efficiency of the tillage is measured by the power consumption or the tillage force ... more ABSTRACT The efficiency of the tillage is measured by the power consumption or the tillage force or draught and the quality of the worked soil. The tillage forces are mainly a function of soil mechanical properties, working parameters of the tool (e.g. depth and speed) and tool geometry. In this paper we report on the numerical modeling of soil tillage. The finite element method (FEM) was used to model the cutting process of the soil using a moldboard. The surface geometry of the moldboard was measured with a 3D touch probe bench, also called coordinate measuring machine, and these data were used to construct the shape with SolidWorks design software. An elasto-plastic constitutive model was used for the soil. The generated surface of the plow was imported to Abaqus software as a discrete rigid body with a reference point at the tip of the moldboard. At this tip the reaction force with its three orthogonal components was calculated. The impact of the cutting angle (angle between the horizontal generatrix and the tillage direction) and the lift angle (angle between the moldboard surface and the horizontal line in an orthogonal section to the cutting edge) on draught force was investigated. The optimal values of these angles are in agreement with experimental data from the literature.
Materials Technology: Advanced Performance Materials, 2008
Machining Science and Technology, 2013
& In the context of high-speed milling (HSM), during the machining process dynamic machine respon... more & In the context of high-speed milling (HSM), during the machining process dynamic machine response has to be identified. To achieve this, we have to calculate the feed rate evolution in linear and circular interpolation according to dynamic performance of machine. In addition to that, actual trajectory for transition passages between two interpolations must be estimated with take into account of specific machining tolerances. This article proposes a model of machine tool behavior for a tool path with linear and circular interpolations and machining cycle time prediction. The method involves subdividing the trajectories into elementary geometries according to the type of interpolation (circular or linear). At points where different trajectories meet, there is often a discontinuity in curvature or in tangency, which decreases the feed rate. At the points of discontinuity in tangency, a fillet radius is inserted. In this article, the influence of the geometry for elementary trajectories was determined. Then, the value of the fillet radius between linear and circular contours in different combinations was modeled. An industrial application was carried out in order to validate models and to determine the influence of feed rate evolution on the machining cycle time.
The International Journal of Advanced Manufacturing Technology, 2013
OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 8655
International Journal of Applied Research and Technology (1737-7463), 2019
One of the non-traditional machining processes is the electrical discharge machining "EDM". It re... more One of the non-traditional machining processes is the electrical discharge machining "EDM". It remains a widely used process in the manufacture of dies and molds. In this process, the material removal is occurred by a series of succeeding and non-stationary electrical discharges between the electrode and the work piece. These discharges are separated from each other in time. Machining parameters such as the pulse time "Ton", the rest time "Toff", the discharge current "I" and the electrical resistivity of the electrode material "Rho" have a major influence on the piece and the tool during machining. The material removal rate plays a very important role in the manufacturing domain as it decides on the time and ultimately the final cost. In this work we studied the interaction between these parameters and their effects on the material removal rate "MRR" then on the relative tool wear "Wr". The modeling through statistical methods using the method design of experiments showed concordance between the experimental results and those calculated.
Journal of Materials Processing Technology, 2011
ABSTRACT The effect of blank-holding on the hole-flanging process was investigated using numerica... more ABSTRACT The effect of blank-holding on the hole-flanging process was investigated using numerical and experimental analysis. Hole-flanging was performed with fixed blank-holder, without blank-holder, with constant blank-holding force and with progressive blank-holding force. Progressive blank-holding force was supplied by springs or preloaded springs. An elasto-plastic finite element model was used to predict the forming kinematics, the punch load and the final shape. A commercial sheet of aluminium alloy with a thickness of 2 mm was selected for this work. Experiments were conducted in order to verify the reliability of the developed elasto-plastic finite element model. The experimental results demonstrated that the finite element model can be used to determine the suitable blank-holding condition for each case.