Дисертації з теми "5 axes"
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Jiang, Xiaogeng. "Characterising geometric errors in rotary axes of 5-axis machine tools." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5871/.
Lacharnay, Virgile. "Modélisation mécanique intégrant des champs répulsifs pour la génération de trajectoires 5 axes hors collision." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0042/document.
Although 5-axis free form surfaces machining is commonly proposed in CAD/CAM software, several issues still need to be addressed and especially collision avoidance between the tool and the part. Indeed, advanced user skills are often required to define smooth tool axis orientations along the tool path in high speed machining. In the literature, the problem of collision avoidance is mainly treated as an iterative process based on local and geometrical collision tests. In this paper, an innovative method based on potential fields is used to generate 5-axis collision-free smooth tool paths. In the proposed approach, The ball-end tool is considered as a rigid body moving in 3D space on which repulsive force, deriving from a scalar potential field attached to the check surfaces, and attractive forces are acting. The resolution of the differential equations of the tool motion ensure smooth variations of the tool axis orientation. The proposed algorithm is applied on open pocket parts such as an impeller and a pocket corner to emphasize the effectiveness of this method to avoid collision. After that, it is possible to see that de calculation time can be very importante for a delicate mesh. It is for that, a voxelisation method is developed to decrease these
Ancuta, Andreea Elena. "Machines parallèles 5-axes pour l'usinage aéronautique de pièces minces." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20051.
Currently, some aeronautical parts are milled by efficient chemical processes, but involving products pollutants and hazardous for workers working on their contact. Therefore, it is imperative to find a solution that would be at least as efficient as chemical milling and much less risky for humans and the environment. It is recognized in the literature that high-speed milling is a serious and effective alternative for the above mentioned problems. Moreover, for years, machine tools based on parallel structure have proven their utility in high-speed milling. In the context of milling of lengthy and complex shaped aeronautical parts, new parallel architectures are proposed. In this manuscript, according to the constraints of tasks, we select a large family of parallel kinematic mechanism that we modelize in a generic and complete way. We use these models for different propositions of mechanisms: 4 degrees of freedom with articulated platform, 4 degrees of freedom with rigid platform and 5 degrees of freedom with actuation redundancy and articulated platform. This work leads to the realization of a prototype that validates the concept of one of these machines
Grandguillaume, Laureen. "Execution adaptative de trajectoire 5 axes sur structures poly-articulées." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN059/document.
5 axes high speed milling is increasingly used for manufacturing high addedvalue parts with complex forms in order to respect surface quality while maximizing productivity. In this context, CAM and more specifically toolpath computations play a major part. This work proposes to define toolpath depending on the workpiece but also onkinematical capacities of the polyarticulated structure.The large variety of structure in terms of architecture and kinematic enforce a generic calculation method to simplify adaptative toolpath generation. A state of the art realized in machining and robotics proposes to investigate the use of kinematical manipulability polytopes to represent kinematical capacities. An analysis of the polytopes and of the workpiece allows to generate toolpaths with a controlled feedrate and a decreasing time in 5 axes positionned milling and in 5 axes continous milling. This formalism highlights strong interactions between milling strategy parameters (workpiece setup, feed direction, tool orientation) and allows to prioritize specific parameters mix to have a controlled execution feedrate
Jousselin, Baptiste. "Développement d'une méthodologie de génération de trajectoires d'ébauche en usinage 5 axes." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST061.
The complexity of the parts to be manufactured leads to an indispensable recourse to digital media for trajectory planning such as Computer Aided Manufacturing (CAM) software. However, a real imbalance is noted between the wide range of 5-axis finishing operations currently available in CAM software and the lack of solutions for the roughing sequence, which can though improve the productivity of the overall machining process.This thesis manuscript therefore tackles the development of a simultaneous 5-axis toolpath planning methodology for the roughing sequence. Guiding curves are used to create a geometric path which allows the tool to travel the whole volume to remove, and thus ensure a maximum material removal. Guiding curves are built automatically from the numerical model of the workpiece and implemented algorithms for calculating curve and surface offsets using vector methods or scalar fields. The orientations of the tool along the guiding curves are then determined by a Sequential Quadratic Programming algorithm, according to criteria of productivity, tool behaviour, and surface quality, by searching for a specific parameterization of the guiding curves.The implementation of the 5-axis roughing strategy in the TopSolid CAM software enabled machining tests with toroidal cutter, which allowed the strategy's validation on typical parts of the aerospace industry
Castagnetti, Cedric. "Amélioration du comportement cinématique des machines par l'optimisation des trajets d'usinage 5 axes." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00731128.
Anthony, Guiot. "Modélisation et simulation du procédé de prépolissage automatique sur centre d'usinage 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00816769.
Guiot, Anthony. "Modélisation et simulation du procédé de prépolissage automatique sur centre d'usinage 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-01044984.
Castagnetti, Cédric. "Amélioration du comportement cinématique des machines par l'optimisation des trajets d'usinage 5 axes." Clermont-Ferrand 2, 2008. http://www.theses.fr/2008CLF21878.
Breteau, Thomas. "USINAGE 5 AXES DE SURFACES GAUCHES CARACTÉRISÉES PAR UN CRITÈRE D'ÉTAT DE SURFACE ADAPTATIF." Phd thesis, Ecole centrale de nantes - ECN, 2010. http://tel.archives-ouvertes.fr/tel-00560042.
Beudaert, Xavier. "Commande numérique ouverte : interpolation optimisée pour l'usinage 5 axes grande vitesse des surfaces complexes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00918816.
Viprey, Fabien. "Modélisation et caractérisation des défauts de structure de machine-outil 5 axes pour la mesure in-process." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN071/document.
In-process metrology consists in obtaining measurement data directly into the manufacturing process. This method results from an increasing need of manufacturers to carry out on-line measurements during one manufacturing task or between two manufacturing tasks by using the mean of production to measure the machined part. Monitoring the sources of errors like geometric errors is one of the prerequisites to ensure the traceable dimensional metrology directly on the machine tool.This thesis deals with the geometric modeling of 5-axis machine tool based on a standardized parameterization of geometric errors. This model is simulated and simplified by the use of a virtual machine developed in order to help understand and visualize the effects of geometric errors on the volumetric error.A new standard thermo-invariant material namely Multi-Feature Bar has been developed.After its calibration and after a European intercomparison, it provides a direct metrological traceability to the SI meter for dimensional measurement on machine tool in a hostile environment. The identification of three intrinsic parameters of this standard, coupled with a measurement procedure ensures complete and traceable identification of motion errors of linear axes. The identification of position and orientation errors of axis is based on an analysis of combinations of necessary parameters to characterize volumetric error and at best. A model parameter identification procedure is proposed by minimizing the time drift of the structural loop and the effects of previously identified motion errors. Asensitivity analysis of the measurement procedure settings and of the noise effects ensures the quality of this proposed identification
Makki, Almohanad. "Copiage rapide de formes sur machine outil à commande numérique en fraisage 5 axes positionné." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00464285.
Tournier, Christophe. "Contribution à la conception des formes complexes : la surface d'usinage en fraisage 5 axes isocrête." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2001. http://tel.archives-ouvertes.fr/tel-00366649.
Tournier, Christophe. "Contribution à l'amélioration de la qualité des surfaces fabriquées sur centre d'usinage à 5 axes." Habilitation à diriger des recherches, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00572727.
Querard, Vincent. "Réalisation de pièces aéronautiques de grandes dimensions par fabrication additive WAAM." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0001/document.
In the field of additive manufacturing (AM), several processes are present and have different applications and levels of development: the main technologies are powder-bed based AM, powder projection and Wire Additive Manufacturing (WAM). We have studied, in this PhD work, the manufacturing of large scale components in aluminum alloy for aircraft industry with Wire Arc Additive Manufacturing (WAAM). This technology is based on a welding generator, a shielding gas protection and a feedstock (wire in this case). To solve this issue, several ways of research were investigated. The first one dealt with toolpath generation: several experiments have highlighted the importance of tool path generation and the tool orientation to manufacture complex parts and improve the part accuracy. The second one was about the validation of the material quality after deposit. Microstructural observations and mechanical tests have demonstrated the effect of process parameters on the deposit quality. Finally, in the context of a DGA/DGAC funded research project, whose partners were STELIA, CT INGENIERIE, CONSTELLIUM and l’Ecole Centrale de Nantes, the manufacturing of functional part in aluminum alloy has shown the interest of the process for aircraft industry. A structural component based on a double curvature geometry has been manufactured with WAAM. The methodologies developed in this PhD work have enabled us to solve the issues to manufacture that type of component
Pechard, Pierre-Yves. "GÉNÉRATION DE TRAJECTOIRES D'USINAGE GRANDE VITESSE 5 AXES PAR FLANC D'OUTIL : INTÉGRATION D'UN CRITÈRE DE FLUIDITÉ." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00573186.
Prat, David. "Développement et modélisation de stratégies de fraisage 5 axes de finition -Application à l’usinage de veines fermées." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0043/document.
The surface quality of closed fluid veins rotating parts of turbo machines participates in the machine output. It is therefore essential to control the finishing of veins in 5-axis machining with a ball end mill. The titanium alloy Ti6Al4V is one of the materials used and suffers from a poor machinability. The choice of cutting parameters affects the surface quality and the life of the cutter. In order to control the 5-axis milling, characterization methods of cutting are developed for linear and circular paths. Effective diameters and the uncut chip thickness is responsible for several phenomena associated with the cut such as the cutting speed, the speed of evolution of the tool wear, the milling modes and cutting forces. Tests are the link between measures of cutting forces and surface quality and characterization methods of cutting. Once the 5-axis machining with ball end mill characterized, two strategies of finishing closed veins in multiaxis are developed keeping constant the feed speed of the contact and the relative orientation of the tool axis with the normal the local surface. The plunge milling strategy is characterized by a curvature continuous trajectory. The helical milling strategy reveals tangent discontinuities of the trajectory. A method of local smoothing trajectory is then developed to provide a reasonable kinematics and dynamics behavior of machine
Chaves-Jacob, Julien. "Développement d'une méthodologie de réduction des défauts géométriques : application à l'usinage 5-axes de composants de turbomachine." Phd thesis, Paris, ENSAM, 2009. http://pastel.archives-ouvertes.fr/pastel-00005522.
Salloum, Tammam. "Conception et réalisation de pièces prototypes fonctionnelles en usinage sur machines-outils à commande numérique 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00442664.
Lavernhe, Sylvain. "Prise en compte des contraintes associées au couple MO-CN en génération de trajectoires 5 axes UGV." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2006. http://tel.archives-ouvertes.fr/tel-00362983.
Ces travaux portent sur l'optimisation de l'usinage 5 axes UGV au travers de l'étude des trajectoires et de leur suivi. Après avoir analysé le processus de réalisation des trajectoires et identifié les limites associées, un modèle d'évaluation des performances cinématiques lors du suivi est développé ; il permet de détecter les portions critiques des trajets ainsi que les éléments limitants. Une structure d'optimisation, basée sur un modèle de description surfacique des trajets est ensuite présentée. L'optimisation de l'orientation de l'axe de l'outil, tenant compte des contraintes précédentes y est plus spécifiquement étudiée pour évaluer la faisabilité d'une telle démarche.
Celik, Kazim Arda. "Development Of A Methodology For Prediction Of Surface Roughness Of Curved Cavities Manufactured By 5-axes Cnc Milling." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608368/index.pdf.
Pessoles, Xavier. "Aide au choix du posage en usinage 5 axes continus par la modélisation du comportement cinématique des machines-outils." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/3547/.
These works deal with productivity improvement in 5-axis machining. A machine tool and its computed numerically control are modeled in continuous 3 and 5 axis machining. A simulator is then performed. It predicts the speed on each axis and can change the programmed feedrate to fit with the specifications of the CAM programmer. Besides, the productivity of the process is improved. In order to reduce the machining time, orientation and positioning of the workpiece in the machine are optimized and the results are summarized in colored maps. This tool allows the operator to choose easily an opimized setup. Both modeling and optimized setup. Both modeling and optimization are validated experimentally. The optimal choice of part setup associated with a change of speed during the program can reduce more than 50% the machining time
Gilles, Patrick. "Positionnement d'outil torique pour l'usinage de surfaces gauches en fraisage 5-axes avec équilibrage de l'effort de coupe transversale." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/330/.
The presented work consists to improve milling process of sculptured surfaces. The aim is to reduce disturbances during machining in order to obtain a better surface roughness without increasing the manufacturing time. The study was conducted in 5-axis milling for torus cutter with round inserts suitable for the considered parts. The first part of this study establishes a cutting force model with a tool axis inclination towards the back of the tool. It leads to a formulation to balance the transversal cutting force that brings a significant improvement on tool dynamic behaviour. The second part presents a free gouging tool positioning and an associated strategy using the balance of transversal cutting force. The proposed method is globally validated on a complete example of sculptured surface machining
Phan, Nguyen Duy Minh. "Trajectoires de numérisation adaptatives en contexte in-situ." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN005/document.
In the context of the inspection of the machining process, the integration of the measurement operations into the manufacturing process allows to realize the corrective actions applied to the manufacturing operations and thus to reduce the manufacturing cycle time. Our objective in this work is to realize an on-machine measurement (OMM) by laser plane sensor in a 5-axis machine-tool. The problem related to OMM concerns the proposition of a scan path planning method that results from a compromise between the measurement time and the quality of the data acquired.First of all, we propose a description format of the parameters of the sensor path allowing to integrate the orientation of the spindle in the machine. As the determination of view point in our context is adopted for the laser plane sensor, the visibility and quality constraints are applied to the digitizing laser line position on the surface. We propose to realize a simulator of digitizing path. This simulator allows us to identify correctly the areas of the digitized part in terms of the scanning visibility and quality. It allows to validate the scan path before executing the scan on the physical system and to help the scan path generation.To control the scan time and quality, a scan path planning method for a 6-axis structure, ISOvScan, is proposed. In this method, the overlap zone between two consecutive passes is constant, the orientation of the sensor at each driven point is managed in order to ensure the scanning quality and to maximize the coverage rate of the laser. The method relies on the use of the Least Squares Conformal Maps (LSCM) to transform the 3D surface into a 2D space. The calculation of the scan path can then be done more simply in this 2D space.Since the kinematics of the machine tool does not enable to directly apply the 6 axes scan path created by ISOvScan, the methods for generating a laser scan path adapted to 5-axis machine-tool are proposed in this work. An application on the 5-axis machine-tool is performed to validate this adapted scan path
Azzam, Noureddine. "Contribution à l'amélioration de la qualité des états de surfaces des prothèses orthopédiques." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4057/document.
Commonly, knee prostheses are composed of two parts fixed respectively on femur and tibia, and a third one called intercalary. During the manufacturing process, of these components distortions appear on roughcast workpiece geometry. Thus, prosthesis manufacturers choose to ensure the nominal thickness of the prosthesis by removing a constant thickness on the roughcast workpiece. This operation is generally carried out realized manually.The aim of this thesis is to contribute to the automation of these manual operations by providing a method to adapt the machining toolpaths at geometrical variations of the target surface. The aim of this research work is to adapt a machining toolpath computed on a nominal model to remove a constant thickness on a roughcast measured surface. The proposed method starts with an alignment step of the measured surface on the nominal toolpath using an ICP algorithm. Subsequently, the nominal toolpath is deformed to remove the desired thickness of the measured rough surface defined in presented case by a STL model. Naturally, discontinuities of this type of model induce the apparition of pattern for the STL on the adapted toolpath and thus on the machined workpiece. Subsequently, to limit this problem and to improve the quality of realized surface, it is proposed a toolpath smoothing method. To validate theoretical developments of this work, tests were carried out on a five-axis machine for roughing of femoral components of a unicompartmental knee prosthesis
Hendriko, ? "Advanced virtual simulation for optimal cutting parameters control in five axis milling." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22464/document.
This study presents a simple method to define the Cutter Workpiece Engagement (CWE) during sculptured surface machining in five-axis milling. The instantaneous CWE was defined by determining two engagement points, lowermost engagement (LE)-point and uppermost engagement (UE)-point. LE-point was calculated using a method called grazing method. Meanwhile the UE-point was calculated using a combination of discretization and analytical method. During rough milling and semi-finish milling, the workpiece surface was represented by vertical vector. The method called Toroidal–boundary was employed to obtain the UE-point when it was located on cutting tool at toroidal side. On the other hand, the method called Cylindrical-boundary was used to calculate the UE-point for flat-end cutter and cylindrical side of toroidal cutter. For a free-form workpiece surface, a hybrid method, which is a combination of analytical method and discrete method, was used. All the CWE models proposed in this study were verified and the results proved that the proposed method were accurate. The efficiency of the proposed model in generating CWE was also compared with Z-mapping method. The result confirmed that the proposed model was more efficient in term of computational time. The CWE model was also applied for supporting the method to predict cutting forces. The test results showed that the predicted cutting force has a good agreement with the cutting force generated from the experimental work
Hadj, Ali Ahmed. "Étude de l'influence des conditions de coupe en usinage 5 axes sur l'intégrité des surfaces par la méthode des surfaces de réponses." Mémoire, École de technologie supérieure, 2005. http://espace.etsmtl.ca/343/1/HADJ_ALI_Ahmed.pdf.
Amtout, Youcef. "Étude de l'influence des stratégies de coupe sur la performance de l'usinage en 5 axes par la méthode des surfaces de réponses." Mémoire, École de technologie supérieure, 2003. http://espace.etsmtl.ca/768/1/AMTOUT_Youcef.pdf.
Hadj, Ali Ahmed. "Étude de l'influence des conditions de coupe en usinage 5 axes sur l'intégrité des surfaces par la méthode des surfaces de réponses /." Montréal : École de technologie supérieure, 2005. http://wwwlib.umi.com/cr/etsmtl/fullcit?pMR03056.
"Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie mécanique". Bibliogr.: f. [162]-165. Également disponible en version électronique.
Amtout, Youcef. "Étude de l'influence des stratégies de coupe sur la performance de l'usinage en 5 axes par la méthode des surfaces de réponses /." Montréal : École de technologie supérieure, 2003. http://wwwlib.umi.com/cr/etsmtl/fullcit?pMQ86822.
"Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie mécanique". Bibliogr.: f. [144]-146. Également disponible en version électronique.
Affouard, Armelle. "Intégration du comportement cinématique des machines-outils lors du calcul de trajectoires d'usinage : résolution du problème de singularité géométrique en usinage à 5 axes." Cachan, Ecole normale supérieure, 2004. http://www.theses.fr/2004DENS0010.
Within the framework of 5 axis machining of complex surfaces, we study the influence of a tool path calculated by a CAM system on the kinematic behavior of the machine tool in High Speed Machining (HSM). HSM aims at ensuring a high displacement rate of the machine tool axes, therefore to introduce a higher continuity into the trajectory, in two ways: either by establishing a better planning of the tool's axis orientation, or by optimizing the description format of the trajectory itself. The introduction of a new description format generates a problem: the kinematic singularity for which we propose a geometrical model and a method of trajectory deformation in order to avoid it. Solving the problem pertains to a more general framework which relates to the optimization of the tool's axis orientation in the workspace in order to improve the kinematic behavior of the rotation axes of the machine tool
Diourté, Adama. "Génération et optimisation de trajectoire dans la fabrication additive par soudage à l'arc." Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30213.
Wire Arc Additive Manufacturing (WAAM) is becoming the primary Additive Manufacturing (AM) technology used to produce medium to large (order of magnitude: 1 m) thin-walled parts at lower cost. To manufacture a part with this technology, the path planning strategy used is 2.5D. This strategy consists in cutting a 3D model into different plane layers parallel to each other. The use of this strategy limits the complexity of the topologies achievable in WAAM, especially those with large variations in curvature. It also implies several start/stop of the arc during its passage from one layer to another, which induces transient phenomena in which the control of energy and material supply is complex. In this thesis, a new manufacturing strategy to reduce the arc start/stop phases to a single cycle is presented. The objective of this strategy, called "Continuous Three-dimensional Path Planning" (CTPP), is to generate a continuous spiral-shaped trajectory for thin parts in a closed loop. An adaptive wire speed coupled with a constant travel speed allows a modulation of the deposition geometry that ensures a continuous supply of energy and material throughout the manufacturing process. The use of the 5-axis strategy coupled with CTPP allows the manufacturing of closed parts with a procedure to determine the optimal closure zone and parts on non-planar substrates useful for adding functionality to an existing structure. Two geometries based on continuous manufacturing with WAAM technology are presented to validate this approach. The manufacturing of these parts with CTPP and several numerical evaluations have shown the reliability of this strategy and its ability to produce new complex shapes with good geometrical restitution, difficult or impossible to achieve today in 2.5D with WAAM technology
Teixeira, Alves Joël. "Définition analytique des surfaces de denture et comportement sous charge des engrenages spiro-coniques." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00743561.
Balasubramaniam, Mahadevan 1976. "Automatic 5-axis NC toolpath generation." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/29225.
Includes bibliographical references (leaves 96-101).
Despite over a decade of research, automatic toolpath generation has remained an elusive goal for 5-axis NC machining. This thesis describes the theoretical and practical issues associated with generating collision free five-axis roughing and finishing toolpaths automatically from the CAD model of the part. Instead of decomposing the shape into manufacturing primitives we generate the collision free tool paths directly from the shape of the workpiece by using accessibility arguments. Specific points of discussion in this thesis include: * A scheme for generating five-axis tool paths using "accessibility" as the driving constraint for tool path generation. * A scheme for approximating the "accessibility" of a class of tools with visibility because direct evaluation of accessibility information of a tool in a part has been shown to be computationally expensive by several researchers. Visibility of a point along an orientation is a necessary condition for accessibility. We have developed algorithms to compute the visibility information rapidly using graphics hardware. * A scheme for extracting the most "promising" orientation from the visibility information for the tool in a "global" sense. Algorithms to process the visibility information to select the orientation based on the characteristics of the machining process have been developed.
(cont.) * A scheme for computing a valid collision free orientation by performing a local search in the neighborhood of the "promising" visible direction using rapid collision avoidance algorithms. Visibility is a necessary but not a sufficient condition for accessibility because visibility cannot account for the geometry of the tool. * A scheme for determining a smooth interpolation between valid tool postures at the end points. This is not a trivial task because the tool must not interfere with the part while interpolating between valid postures. The visibility cones of the end points are used to compute a "globally" valid interpolatory path and the interpolated postures are then "locally" profiled for access by using rapid collision detection algorithms. The algorithms outlined in this thesis make it possible, for the first time, to generate 5-axis CNC tool paths automatically from a CAD file. The algorithms have been implemented and tested on several parts.
by Mahadevan Balasubramaniam.
Ph.D.
孝行, 赤井, та Takayuki Akai. "5軸制御マシニングセンターの運動精度と加工精度向上に関する研究". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902972/?lang=0, 2015. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902972/?lang=0.
A new calibration method to improve the motion accuracy of a 5-axis control machining center has been developed. A method to diagnose various causes of motion errors on linear and rotary axes has been also established. Furthermore, a diagnosis method of motion errors caused by servo motors using the position feedback function is suggested in this paper. This study also figured out employing the direct drive motor for the rotary axes improved the characteristics of all the servo motors on the machine. Finally, the development test machine proved its high machining accuracy through actual machining of a complex-shaped workpiece.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Persson, Erik, and Magnus Hansson. "Konstruktion av 6:e axel på 5-axligportalfräsmaskin." Thesis, Halmstad University, School of Business and Engineering (SET), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4496.
During springterm 2010 Erik Persson and Magnus Hansson performed their Thesis
Work with DIAB Laholm, in Hallands County for University of Halmstad.
The project has been a product development project without exterior customers. Thus
it had a great emphasis on functionality and less emphasis on marketing and such.
This reflects the ambition to develop machinery to be used within the production
facilities of DIAB Laholm, not to be sold to exterior customers.
Main objective has been to create machinery which enables the production of
rotational symmetric work pieces within a NC-milling machine with 5 axles. The
work pieces milled will be made of DIAB’s material Divyncell with varying
densities.
The project has followed Fredy Olssons method involving Principal – Primary –
Manufacturing constructions. However a complete manufacturing construction has
not been made since DIAB just wanted a good Primary construction which will serve
as a base for finishing touches at DIAB.
By the end of the project material including calculations has been sent to DIAB and
they will finish the work and manufacture the machine if they find economic viability
in this.
The work method has been suited for this by several reasons, it was created with
these projects in mind and it’s also the method most familiar to us.
Bushendorf, Jeffrey. "Field study of the 5-Axis Forest-Line versus the 5-Axis Fidia-211 in the case of a midwestern engineering firm." Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009bushendorfj.pdf.
Son, Seung-Kil 1964. "A hybrid type small 5-axis CNC milling machine." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29275.
Includes bibliographical references (leaves 116-119).
5-axis CNC milling machines are important in a number of industries ranging from aerospace to consumer-die-mold machining because they can deliver high machining accuracy with a spindle tilting capacity. Most of these machines have serial mechanisms so that low static and dynamic stiffness become very critical design issues especially for high speed machining. Parallel mechanisms have recently received attention from machine tool designers because of their inherent potential for stiffness and because of their compactness. However, much of the promised advantages of parallel machines only occur within a very small region of their workspace with the expense of the large machine-tool foot print. We discuss some of the kinematic and structural challenges to extracting machining performance from serial and parallel machines. We compare a hybrid machine, which combines serial and parallel mechanisms, with typical serial and parallel machines such as Euler angle machines and the Hexapod. In particular, we consider singularities, reversal characteristics, and manufacturability. We show that hybrid machines can benefit from the advantages of serial and parallel mechanisms while avoiding most potential pitfalls of both mechanisms. However, hybrid structures can suffer from the manufacturing problem of over-constraint. We show that the degree of over-constraint depends on the size of the parallel machine. We have designed and fabricated a small hybrid 5-axis motion platform, the MIT-SS-1, which can tolerate this over-constraint through a novel layout of axes. Numerical and experimental test results of the MIT-SS-1 are presented and compared. Finally we show that this structure has potential as a small 5-axis CNC milling machine.
by Seung-Kil Son.
Ph.D.
Chen, Kun. "Haptic system for collision-free 5-axis tool path generation /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20CHENK.
Uddin, Mohammad Sharif. "Tool Path Modification Approaches to Enhance Machining Geometric Accuracy in 3-Axis and 5-Axis Machining." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49142.
Introduction Precision manufacture of components has become a necessity in the present day manufacturing sectors. The ever-increasing demands of humankind have forced researchers to come up with more improved innovations in technology; achieving higher levels of integration in microprocessors, and creating more versatile and precision multitasking systems being just a few of the major drivers in this area. All these, however, have one rudimentary requirement, namely, the need to use very high precision components. Hence, it can be very safely concluded that the success of each of these industries hinges on the ability to produce such components. Recently, as the tremendous demands for mechanical parts with high geometric and dimensional accuracy increase, an exigency to produce those parts with such accuracy is greatly comprehended by today’s manufacturing industries. To this end, CNC machine tools are the most important means of production for the manufacturing industries. CNC machine tools have been widely applied to a range of applications, for example, in the aerospace industries. With the recent advancement of the machine tools manufacturing technologies including high speed feed drives and high speed spindles, high speed end milling on the CNC machine tools has become constantly popular, and is being performed to manufacture the components with the required contour geometry and dimensional accuracy. However, the geometric accuracy of the machined surface is greatly affected by the numerous errors sources ranging from errors existing in the machine tool system itself to the errors due to the cutting process. Figure 1-1 shows the general error sources that influence the machining geometric accuracy [Kakino et al., 1993]. Broadly, machining geometric errors are caused by two major error sources: motion errors of the machine tool system and errors due to the machining process. The key factors among error sources in the machine tool system that cause deviation of tool tip position relative to workpiece, and hence machining geometric errors are positioning errors and volumetric errors. Here, positioning errors are defined as the linear errors of the positioning mechanism, whose directions are in parallel with the direction of axis movement required for desired positioning. On the other hand, volumetric errors are here defined as error components whose directions are perpendicular to the direction of axis movement.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第13390号
工博第2861号
新制||工||1420(附属図書館)
25546
UT51-2007-Q791
京都大学大学院工学研究科精密工学専攻
(主査)教授 松原 厚, 教授 吉村 允孝, 教授 松久 寛
学位規則第4条第1項該当
Alexander, Yuen. "Spline interpolation and contour error pre-compensation for 5-axis machining." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44659.
Gulda, Jiří. "Řešení technologie při výrobě odlitku v malé strojírenské firmě." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229485.
Sencer, Burak. "Smooth trajectory generation and precision control of 5-axis CNC machine tools." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/14084.
Fitsos, Pete. "A study on a novel 5 axis machine tool using direct drive /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Miao, Lu. "REDOX-REGULATED RELB-AR AXIS MEDIATES PROSTATE SPECIFIC ANTIGEN EXPRESSION: INSIGHT IN PROSTATE CANCER RESPONSE TO RADIATION THERAPY." UKnowledge, 2013. http://uknowledge.uky.edu/toxicology_etds/5.
Wang, Nan. "Tool path generation method for 5-axis NC machining with flat-end cutter /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20WANG.
Chang, Cheng-Shun, and 張承濬. "The Development of 5-Axes HumanoidRobot System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79875721580317372824.
吳鳳科技大學
光機電暨材料研究所
101
Robot mechanical design technology in the past mainly focused on the non-mobile and non-interactive industrial robot arm. Robot arm mechanism design is to interact with human, such as applications of saying hello or grabbing objects. We used the package “Working Model” to implement the inverse kinematics analysis of a 5-axes robot arm. We used Working Model to validate the equations of motion of the robot arm. In the future, we will also send the data on each axis obtained from inverse kinematics analysis to the motion control system to complete the motion control of the 5-axis robot arm. As can be seen from the results of the experiment, the motor mounted at shoulder drivs the elbow joint through the timing belt. Because the arm mechanism is heavy, the belt needs frequent maintenance. Fatigue fracture and other shortcomings make the arm not able to move up for long. Therefore, in the design of a new mechanical arm, we use worm and worm wheel to consistute the power transmission mechanism in each joint. Because worm pair has a mechanical self-locking function, we do not need the brake mechanism to keep the robot hold on for long. The arm is more stable as well. In order to meet the requirement of the motion control card inputs, an encoder is mounted in the end of the motor which allows control card to communicate with the motor.
Liu, Wei-Le, and 劉偉樂. "Method for Measuring Dynamic Error of 5-axis CNC Machine Tools'' Rotary Axes." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/36676174708363398204.
SHI, DUN-ZHI, and 石敦智. "Application of 5-axes robot for line guidance problems." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/81417939513220607041.