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Статті в журналах з теми "Reconfigurable machines tools (RMT)":
1
McLaren, Ian, and I. Gorlach. "Development of a Tool Changer for a Reconfigurable Machine Tool." Applied Mechanics and Materials 798 (October 2015): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amm.798.324.
Анотація:
Automated tool changing of CNC machines reduces the cycle time of operations as most processes require a number of different tools to complete a task. The machine can be pre-loaded with the required tools and programmed to automatically retrieve the tools as required. CNC machines will often run unattended or work too quickly for manual intervention, so it is important that safety features and checks are built in to prevent damage. The purpose of this research project was to modify a tool changing system for a reconfigurable machine tool (RMT), which was previously developed in the Department of Mechatronics. The RMT is capable of performing milling, drilling and electric discharge machining (EDM). In this research, the automated tool changer (ATC) was developed and successfully integrated into the RMT, and interfaced with the machine controller. The redesigned ATC is able to provide fast, reliable and safe tool changing for a variety of tools.
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Katz, Reuven, John Yook, and Yoram Koren. "Control of a Non-Orthogonal Reconfigurable Machine Tool." Journal of Dynamic Systems, Measurement, and Control 126, no. 2 (June 1, 2004): 397–405. http://dx.doi.org/10.1115/1.1771692.
Анотація:
Computerized control systems for machine tools must generate coordinated movements of the separately driven axes of motion in order to trace accurately a predetermined path of the cutting tool relative to the workpiece. However, since the dynamic properties of the individual machine axes are not exactly equal, undesired contour errors are generated. The contour error is defined as the distance between the predetermined and actual path of the cutting tool. The cross-coupling controller (CCC) strategy was introduced to effectively decrease the contour errors in conventional, orthogonal machine tools. This paper, however, deals with a new class of machines that have non-orthogonal axes of motion and called reconfigurable machine tools (RMTs). These machines may be included in large-scale reconfigurable machining systems (RMSs). When the axes of the machine are non-orthogonal, the movement between the axes is tightly coupled and the importance of coordinated movement among the axes becomes even greater. In the case of a non-orthogonal RMT, in addition to the contour error, another machining error called in-depth error is also generated due to the non-orthogonal nature of the machine. The focus of this study is on the conceptual design of a new type of cross-coupling controller for a non-orthogonal machine tool that decreases both the contour and the in-depth machining errors. Various types of cross-coupling controllers, symmetric and non-symmetric, with and without feedforward, are suggested and studied. The stability of the control system is investigated, and simulation is used to compare the different types of controllers. We show that by using cross-coupling controllers the reduction of machining errors are significantly reduced in comparison with the conventional de-coupled controller. Furthermore, it is shown that the non-symmetric cross-coupling feedforward (NS-CC-FF) controller demonstrates the best results and is the leading concept for non-orthogonal machine tools.
3
Zhou, Feng Xu, Ai Ping Li, Nan Xie, and Li Yun Xu. "Reconstruction Method of Reconfigurable Machine Tool Based on Task Polymorphism." Advanced Materials Research 971-973 (June 2014): 1001–4. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1001.
Анотація:
For the problem of reconfigurable machine tools existing in the field of manufacturing and processing cost, the reconfiguration strategy of a reconfigurable machine tool (RMT) was proposed based on the analysis of polymorphism processing tasks. Firstly, the models of fixed cost and reconstruction cost in per production cycle were built. On this basis, the cost model of RMT during the whole production cycle was built. Then the Dijkstra’s algorithm was used to solve the model and the optimal reconstruction program was obtained. Finally, a RMT for the engine block production was taken as an example to verify the validity of the model and the method.
4
Singh, Ashutosh, Mohammad Asjad, Piyush Gupta, and Jahangir Quamar. "An Approach to Develop Shaper Cum Slotter Mechanism: A Reconfigurable Machine Tool." South Asian Journal of Business and Management Cases 8, no. 2 (April 8, 2019): 195–206. http://dx.doi.org/10.1177/2277977919833765.
Анотація:
The traditional structure of machines (such as lathe, milling, shaper, slotter, drilling and planer) has become questionable because of the modular concepts (such as modularity, scalability, convertibility, mobility and flexibility) and reconfiguration becomes a promising approach towards modular manufacturing machines, in which manufacturing techniques are independent of changes. In this area, reconfigurable machine tool (RMT) forms a new class of modular machines in current manufacturing scenario where the manufacturing industry put a strong pressure on good quality and price reduction. The capabilities of the machines tool and manufacturing systems in reconfigurable manufacturing system (RMS) change with each reconfiguration (both software and hardware modules). In this case, an approach is presented for reconfiguration of horizontal shaper machine for developing the modular shaper cum slotter machine in a manufacturing system by adding some auxiliary (like Scott Russel mechanism) and some basic modules and the reconfiguration features of traditional shaper and slotter machine are also discussed. The proposed approach is illustrated with a figure, which has been designed on 3-D design tool (solid-works software platform). It is expected that, this work will help designers and practising engineers by making them aware of the reconfiguration mechanisms on traditional shaper machine, which have become a necessity for the very survival of manufacturing by lowering the operational costs.
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Sibanda, Vennan, Khumbulani Mpofu, John Trimble, and Mufaro Kanganga. "Development of part families for a reconfigurable machine." Journal of Engineering, Design and Technology 18, no. 5 (December 9, 2019): 991–1014. http://dx.doi.org/10.1108/jedt-06-2019-0159.
Анотація:
Purpose Reconfigurable machines tools (RMTs) are gaining momentum as the new solutions to customised products in the manufacturing world. The driving force, among others, behind these machines is the part envelope and the part family of products that they can produce. The purpose of this paper is to propose a new class of RMT known as a reconfigurable guillotine shear and bending press machine (RGS&BPM). A part family of products that this machine can produce is developed using hierarchical clustering methodologies. The development of these part families is guided by the relationship of the parts in the family in terms of complexity and geometry. Design/methodology/approach Part families cannot be developed in isolation, but that process has to incorporate the machine modules used in the reconfiguration process for producing the parts. Literature was reviewed, and group technology principles explored, to develop a concept that can be used to develop the part families. Matrices were manipulated to generate part families, and this resulted in the development of a dendrogram of six possible part families. A software with a graphic user interface for manipulation was also developed to help generate part families and machine modules. The developed concept will assist in the development of a machine by first developing the part family of products and machine modules required in the variable production process. Findings The developed concepts assist in the development of a machine by first developing the part family of products and machine modules required in the variable production process. The development of part families for the RGS&BPM is key to developing the machine work envelope and modules to carry out the work. This work has been presented to demonstrate the importance of machine development in conjunction with a part family of products that the machine will produce. The paper develops an approach to manufacturing where part families of products are developed prior to developing the machine. The families of products are then used to develop modules that enable the manufacture of the parts and subsequently the size of the machine. Research limitations/implications The research was limited to the development of part families for a new RGS&BPM, which is still under development. Practical implications The study reflects the development of reconfigurable machines as a solution to manufacturing challenges in terms of group technology approaches adopted in the design phase. It also highlights the significance of the concepts in the reconfigurable machine tool design. The part families define the machine work envelop and its reconfiguration capability. Social implications The success of the research will usher an alternative to smaller players in sheet metal work. It will contribute to the easy development of the machine that will bridge the high cost of machine tools. Originality/value The study contributes to the new approach in sheet metal manufacturing where dedicated machines may be substituted by a highly flexible reconfigurable machine that has a dual operation, making the investment for small to medium enterprises affordable. It also contributes to the body of knowledge in reconfigurable machine development and the framework for such activities, especially in developing countries.
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Gopalakrishnan,, V., D. Fedewa,, M. G. Mehrabi,, S. Kota, and, and N. Orlandea. "Parallel Structures and Their Applications in Reconfigurable Machining Systems." Journal of Manufacturing Science and Engineering 124, no. 2 (April 29, 2002): 483–85. http://dx.doi.org/10.1115/1.1459468.
Анотація:
Reconfigurable Machine Tools (RMTs), assembled from machine modules such as spindles, slides and worktables are designed to be easily reconfigured to accommodate new machining requirements. Their goal is to provide exactly the capacity and functionality, exactly when needed. In this paper, we present a novel parallely-actuated work-support module as a part of an RMT to meet the machining requirements of specific features on a family of automotive cylinder heads. A prototype of the proposed module is designed/built and experimental results regarding its performance are presented.
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Wang, Yongquan, Guangpeng Zhang, Jiali Wang, Pan Liu, and Nina Wang. "Reconfigurable Machine Tool Design for Box-Type Part Families." Machines 9, no. 8 (July 29, 2021): 148. http://dx.doi.org/10.3390/machines9080148.
Анотація:
The reconfigurable manufacturing system (RMS) is a new manufacturing technology and paradigm that resolves the contradictions regarding high efficiency, low cost and flexible production in the mass production of part families. Reconfigurable machine tools (RMTs) are the core components of RMSs. A new approach is proposed for the design of RMTs, which is closely related to the process planning of a given box-type part family. The concepts of the processing unit and the processing segment are presented; they are not only the basic elements of the processing plans of machined parts, but also closely related to the structural design of RMTs. Processing units created by processing features can be combined into various processing segments. All the processing units of one processing segment correspond to the machining operations performed by one RMT. By arranging the processing segments according to the processing sequence, a variety of feasible processing plans for a part can be obtained. Through analysis of the established similarity calculation model for processing plans, the most similar processing plans for the parts in a given part family can be determined and used for the structural design of RMTs. Therefore, the designed RMTs can achieve rapid conversion of processing functions with the least module replacement or adjustment to realize the production of the parts in the part family. Taking the production of a gearbox part family as an example, the validity of the presented method is verified.
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Liu, Ping, Qiang Zhang, and Jürgen Pannek. "Development of Operator Theory in the Capacity Adjustment of Job Shop Manufacturing Systems." Applied Sciences 9, no. 11 (May 31, 2019): 2249. http://dx.doi.org/10.3390/app9112249.
Анотація:
With the development of industrial manufacture in the context of Industry 4.0, various advanced technologies have been designed, such as reconfigurable machine tools (RMT). However, the potential of the latter still needs to be developed. In this paper, the integration of RMTs was investigated in the capacity adjustment of job shop manufacturing systems, which offer high flexibility to produce a variety of products with small lot sizes. In order to assist manufacturers in dealing with demand fluctuations and ensure the work-in-process (WIP) of each workstation is on a predefined level, an operator-based robust right coprime factorization (RRCF) approach is proposed to improve the capacity adjustment process. Moreover, numerical simulation results of a four-workstation three-product job shop system are presented, where the classical proportional–integral–derivative (PID) control method is considered as a benchmark to evaluate the effectiveness of RRCF in the simulation. The simulation results present the practical stability and robustness of these two control systems for various reconfiguration and transportation delays and disturbances. This indicates that the proposed capacity control approach by integrating RMTs with RRCF is effective in dealing with bottlenecks and volatile customer demands.
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Singh, Ashutosh, Mohammad Asjad, and Piyush Gupta. "Enhancing the Reconfigurability Issues of Machine Tool for Reconfigurable Manufacturing System (RMS)." Journal of Industrial Integration and Management 05, no. 03 (July 9, 2020): 349–463. http://dx.doi.org/10.1142/s2424862220500037.
Анотація:
This paper presents a novel concept to enhance the reconfigurability issues (i.e. convertibility, flexibility, etc.) of a small-scale reconfigurable machine tool (RMT) by combining multiple modules (both basic and auxiliary parts) and manufacturing operations on a single workstation. The proposed reconfigurable machine will reduce the overall space, transport time, ramp up time, reconfiguration time and interim storage space. Further, various characteristics of reconfigurability (such as scalability; convertibility, flexibility, etc.) and enablers of the machine tool have been discussed. The proposed design is illustrated with a figure, which is designed on a 3D design tool (solid-works software platform).This machine tool will perform six major cutting and finishing operations, namely, hacksaw cutting, milling, drilling, grinding, buffing and lathe operations on a single work platform.
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KOVALEVSKYI, S. V., O. S. KOVALEVSKA, and V. M. OSIPOV. "CONCEPT OF THE MULTYNOMENCLATURE RECONFIGURABLE MACHINE REPAIR CLUSTER." Economic innovations 20, no. 4(69) (December 20, 2018): 91–100. http://dx.doi.org/10.31520/ei.2018.20.4(69).91-100.
Анотація:
Topicality. Ensuring reliable functioning of equipment and mechanisms by forming a machine-building cluster, which reduces the idle time as a result of the creation of flexible technological systems based on numerically controlled machine tools. The reliability of the functioning of production facilities created at the machine-building and processing enterprises is achieved not only by high-quality manufacturing, but also by the level of service, which is a continuous support of the working capacity of machines and mechanisms, based on the timely provision of spare parts and repair and maintenance products.Aim and tasks The purpose of the article is to search for innovative model of repair production, based on ensuring its flexibility through adaptive reconfiguration of technological equipment, focused on supporting the life cycle of the main production. Development of high-performance technologies, aimed at achieving advantages in the selected sectors of the economy.Research results. The conceptualization of the maintenance of the machine-repair function in the structure of the reconfigurable multi-cluster cluster, formed on the innovation platform of the machine-assembly shop on the basis of mobile intelligent machines with kinematics of a parallel structure, was realized. The gamma (dimensional series) of elements of the reconfigurable manufacturing system on the basis of mobile machines with parallel kinematics and intelligent control systems, which allows maintenance of a machine-repair cluster on the basis of reconfigurable productions, is developed. The proposed concept can be offered as a market product in the form of a gamut of mobile machines with intelligent control for different productions. The concept of reconfigurable multi-nomenclature production, based on a fundamentally new approach to layout, in particular, a mechanic-assembly shop of competitive production with the use of mobile intelligent machines with kinematics of a parallel structure, has been formed. The method of position identification, kinematic and dynamic parameters of mechanisms with the parallel kinematics structure, of which mobile machines are composed, is developed.Conclusions. The proposed ideology of the formation of the production structure of the cluster will ensure the consolidation of all types of capital: production, labor, financial, social and create conditions for the synergistic effect as a result of constructive interaction in the process of functioning of the BRMK.
Дисертації з теми "Reconfigurable machines tools (RMT)":
1
Ameer, Muhammad. "Integrated and multi-criteria approaches for process plan generation in reconfigurable manufacturing systems with consideration of system capabilities and product constraints." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0242.
Анотація:
Les systèmes de fabrication modernes connaissent un changement de paradigme qui met l'accent sur l'intégration des technologies du numérique dans les systèmes de production afin de relever le défi des demandes incertaines du marché. Les systèmes de fabrication ont besoin d'une certaine réactivité pour faire face à ces incertitudes en s'adaptant en conséquence, et nécessitent une plus grande évolutivité aux niveaux physique et logique. À cet effet, les systèmes de fabrication modernes sont conçus avec des capacités de ressources dynamiques, avec des composants modulaires, de sorte qu'ils puissent fournir le niveau requis de reconfigurabilité. Dans la perspective de l'"industrie 4.0", la reconfigurabilité est indispensable à l'adaptation efficace des systèmes de fabrication dans un environnement complexe. La reconfigurabilité permet une adaptation rapide de ces systèmes ainsi qu'une réactivité rapide à la compétitivité socio-techno-économique. L'objectif est de répondre aux défis modernes (externes et internes), c'est-à-dire la personnalisation de masse, la mondialisation, la gestion de la variété des produits, la gestion de la reconfiguration des systèmes et la réduction des délais.Dans cette thèse, le problème de conception des systèmes de fabrication reconfigurables (RMS) est considéré pour répondre aux exigences susmentionnées. L'objectif est de concevoir un système réactif basé sur deux caractéristiques clés : la modularité et la reconfigurabilité. Nous étudions le problème de conception du RMS comme étant le développement d'une gamme de fabrication pour une pièce spécifique de la famille considérée, ainsi que la sélection des capacités de ressources dynamiques du système pour fabriquer cette pièce.Ce travail est divisé en trois parties : (1) Cogénération du processus et du plan de préparation pour une pièce dans un environnement reconfigurable. L'objectif principal est de développer une nouvelle approche pour considérer conjointement les contraintes de préparation et de gamme de fabrication, en tenant compte des relations entre les opérations. (2) Minimisation de l'effort de reconfiguration dans la conception des gammes. Nous proposons un nouvel indice de performance de l'effort généré par la reconfiguration des machines et des fixations, ainsi que le transfert des pièces. L'objectif est d'assurer une meilleure réactivité et une haute performance la gamme conçue. (3) Maximisation de l'utilisation des capacités des ressources dynamiques de la conception RMS. Nous considérons un problème de conception RMS pour la sélection de machines, où la sélection de différents types de machines-outils reconfigurables (RMT) est réalisée pour exécuter la gamme de la pièce considéréeModern manufacturing systems are going through a paradigm shift where the focus is on the integrating the digital technologies in the production systems to address the challenge of uncertain market demands. Manufacturing systems needs certain amount responsiveness to address these uncertainties by adapting accordingly, and require more changeability at physical as well as logical levels. For this purpose, modern-day manufacturing systems are designed with dynamic resource capabilities, with modular components, so that they can provide the required amount of reconfigurability. From the perspective of "industry 4.0", reconfigurability is vital for the effective adaptation of manufacturing systems in a complex environment. Reconfigurability provides the quick adaptation of these systems along with quick responsiveness towards socio-techno-economic competitiveness. The objective is to respond to modern-day challenges (both external and internal), i.e. mass customization, globalization, product variety management, system reconfiguration management, and reducing the lead time.In this thesis, the design problem of reconfigurable manufacturing systems (RMS) is considered which meets the aforementioned requirements. The goal is to design a responsive system based on two key features modularity and reconfigurability. We study the RMS design problem as, the development of a process plan for a particular part of the part family along with the selection of the system's dynamic resource capabilities to perform that part. This work is divided into three parts: (1) Co-generation of process and setup plan for a part in the reconfigurable environment. The main objective is to develop a new approach to jointly consider the setup and process plan constraints, with consideration of relationships between the operations. (2) Minimisation of reconfiguration effort in process design. We propose a novel performance index of the effort generated by the machines and fixtures reconfiguration, and part transfer. The objective is to ensure better responsiveness and high performance of the designed process plan. (3) Maximisation the utilization of dynamic resource capabilities of RMS design. We consider a RMS design problem for machine selection, where selection of different types of reconfigurable machine tools (RMTs) are carried out for performing the process plan of considered part
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Collins, James. "Automatic calibration of a tool-changing unit for modular reconfigurable machines." Thesis, 2011. http://hdl.handle.net/10413/8859.
Анотація:
Modern trends in customer demand have resulted in the development of a class of
manufacturing system known as Reconfigurable Manufacturing Systems (RMS).
Reconfigurable systems are designed around the idea that they must be able to be
reconfigured in both their production capacity as well as in the machining processes they
perform. A subset of the RMS paradigm is a group of machines called Modular
Reconfigurable Machines (MRMs). Modular machines are built up from different hardware
modules. They offer the user the possibility of only purchasing the required tooling for the
specific need at the time. As reconfigurable machines are able to offer flexibility in
machining functions, their ability to have easy access to a variety of machine tools would
greatly influence their effectiveness and production capacity. This project presents a
machine tooling system that would provide MRMs with an efficient way to change tools.
A major requirement of the unit was that it should automatically calibrate itself in terms
of its position relative to the machine it was servicing. In order for the unit to realize this
requirement, it needed a method that would provide it with real-time 3D tracking of the
spindle with which it was interacting. Commercially available systems that offer this
facility are very costly. A popular gaming controller, the Nintendo Wii remote, was used to
provide the tool-changing unit with a very economical real-time 3D tracking capability.
This dissertation details the design, implementation and testing of the positioning system
for the tool-changing unit.Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.
Книги з теми "Reconfigurable machines tools (RMT)":
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Dai, Jian S. Advances in Reconfigurable Mechanisms and Robots I. London: Springer London, 2012.
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Kong, Xianwen, Matteo Zoppi, and Jian S. Dai. Advances in Reconfigurable Mechanisms and Robots I. Springer London, Limited, 2016.
Частини книг з теми "Reconfigurable machines tools (RMT)":
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Kimmig, Andreas, Jieyang Peng, and Jivka Ovtcharova. "Capacity Building for Digital Work – A Case from Sino-German Cooperation." In New Digital Work, 260–75. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26490-0_15.
Анотація:
AbstractThe way humans work is constantly changing. This has always been the case, especially in dynamic environments. In the context of Industry 4.0 and the Internet of Things (IoT), collaborative platforms, accelerated by Artificial Intelligence (AI) technologies, give rise to new automation opportunities of complex and previously labor-intensive tasks, while also creating new business models for multiple stakeholders.Due to accelerated product innovation, the manufacturing industry needs to be able to generate solutions in a timely manner and quickly move them into production according to customer expectations. Today, machines in an Industry 4.0 factory are collaboratively connected. Such a development requires the application of advanced predictive tools that can systematically transform requirements and data into information and ultimately knowledge to manage uncertainties and make informed ad hoc decisions. In this context, a production system needs to perform rapid self-reconfiguration in response to different product characteristics to achieve an agile transition to the new manufacturing processes. However, a large number of non-standardized device interfaces and communication protocols are currently existing on the shop floor, which leads to high time and capital costs. Furthermore, this leads to insufficient reliability in the configuration of the production system, so that the requirements for customization and rapid adaptation cannot be met. In addition, there is also a large knowledge gap in the academic field of self-configurable intelligent production systems using collaborative engineering and IoT platforms.Therefore, Karlsruhe Institute of Technology (KIT, Germany) and Tongji University (Shanghai, People´s Republic of China) have proposed the collaborative “Construction, Reference Implementation and Verification Platform of Reconfigurable Intelligent Production Systems” and the “Factory Automation Platform”, which meets the challenges of self-configuration, agile response, accumulation of domain knowledge and services, intelligent operation and maintenance of production systems.
Тези доповідей конференцій з теми "Reconfigurable machines tools (RMT)":
1
Katz, Reuven, and Yoram Koren. "Reconfigurable Machines." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59056.
Анотація:
Reconfigurable Machines form a new class of machines that are designed around a specific part family of products and allow rapid change in their structure. They are designed to allow changes in production requirements by changes in the machine mechanical configuration and structure. Reconfigurable machines might be designed for various types of production operations such as machining, inspection and assembly. This paper introduces characteristics and design principles of reconfigurable machines, and describes their features using an example of our new full-scale industrial prototype of a Reconfigurable Bore Surface Inspection Machine (RBSIM). In addition, the paper also describes briefly other three prototypes of Reconfigurable Machines that were developed during recent years in our center: (1) the Reconfigurable Machine Tool (RMT), (2) the Reconfigurable Inspection Machine (RIM), and (3) the Reconfigurable Assembly Machine (RAM).
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Ersal, Tulga, Jeffrey L. Stein, and Loucas S. Louca. "A Modular Modeling Approach for the Design of Reconfigurable Machine Tools." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59806.
Анотація:
A new generation of machine tools called Reconfigurable Machine Tools (RMTs) is emerging as a means for industry to be more competitive in a market that experiences frequent changes in demand. New methodologies and tools are necessary for the efficient design of these machine tools. It is the purpose of this paper to present a modular approach for RMT servo axis modeling, which is part of a larger effort to develop an integrated RMT design and control environment. The components of the machine tool are modeled in a modular way, such that the model of any given configuration can be obtained by assembling the corresponding component models together based on the topology of the machine. The component models are built using the bond graph language that enables the straightforward development of the required modular library. These machine tool models can be used for the evaluation, design and control of the RMT servo axes. The approach is demonstrated through examples, and the benefits and drawbacks of this approach are discussed. The results show that the proposed approach is a promising step towards an automated and integrated RMT design environment, and the challenges in order to complete this goal are discussed.
3
Huang, Sihan, Cong Zeng, Guoxin Wang, and Yan Yan. "Optimal Reconfiguration Path Decision Method for One RMT System." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98234.
Анотація:
Abstract Reconfigurable manufacturing system (RMS) is designed around a specific part family. Reconfigurable machine tools (RMT) is the core facility of RMS. One RMT system is an RMS consisting of only one RMT. So, the RMT of one RMT system is designed for a specific part family, which integrates the characteristics of RMS and RMT. The reconfiguration path problem of one RMT system is an urgent problem to be solved. Therefore, an optimal reconfiguration path decision method for one RMT system is proposed in this paper. The objective is to produce the entire part family at the minimum reconfiguration effort. Reconfiguration time is adopted as the characteristic value of reconfiguration effort in this paper. The Tabu Search algorithm (TS) is used to solve this problem due to its excellent search ability. Process rule is considered during computation to obtained reasonable solution. A case study is given to implement the proposed method. The result shows that the proposed method can produce an optimal reconfiguration path for one RMT system satisfying the process rule.
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Gopalakrishnan, Venkat, and Sridhar Kota. "A Parallely Actuated Work Support Module for Reconfigurable Machining Systems." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5959.
Анотація:
Abstract In order to respond quickly to changes in market demands and the resulting product design changes, machine tool manufacturers must reduce the machine tool design lead time and machine set-up time. Reconfigurable Machine Tools (RMTs), assembled from machine modules such as spindles, slides and worktables are designed to be easily reconfigured to accommodate new machining requirements. The essential characteristics of RMTs are modularity, flexibility, convertibility and cost effectiveness. The goal of Reconfigurable Machining Systems (RMSs), composed of RMTs and other types of machines, is to provide exactly the capacity and functionality, exactly when needed. The scope of RMSs design includes mechanical hardware, control systems, process planning and tooling. One of the key challenges in the mechanical design of reconfigurable machine tools is to achieve the desired machining accuracy in all intended machine configurations. To meet this challenge we propose (a) to distribute the total number of degrees of freedom between the work-support and the tool and (b) employ parallely-actuated mechanisms for stiffness and ease of reconfigurability. In this paper we present a novel parallely-actuated work-support module as a part of an RMT. Following a brief summary of a few parallel mechanisms used in machine tool applications, this paper presents a three-degree-of-freedom work-support module designed to meet the machining requirements of specific features on a family of automotive cylinder heads. Inverse kinematics, dynamic and finite element analysis are performed to verify the performance criteria such as workspace envelope and rigidity. A prototype of the proposed module is also presented.
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Moon, Yong-Mo, and Sridhar Kota. "Generalized Kinematic Modeling Method for Reconfigurable Machine Tools." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5946.
Анотація:
Abstract Using a library of machine modules, modular machine tools are being developed by many machine tool manufacturers to reduce design lead time. To accommodate frequent changes in product design in a timely and cost-effective manner, the next generation of machine tools should be reconfigurable to process a family of products. This enables reduction not only in machine design lead time but more significantly a reduction in machine set-up and ramp-up time. The essential characteristics of Reconfigurable Machine Tools (RMTs) include modularity, convertibility, flexibility, and cost-effectiveness. Currently there is no systematic method of designing modular machines, let alone reconfigurable machines. This paper presents a methodology for kinematic synthesis of machine tools using screw theory. The motion characteristics of a set of desired machining tasks as well as stored library of machine modules are captured in a common representation scheme. A simple design example to illustrate the application of this methodology for systematic selection and synthesis of reconfigurable machine tools is presented. The proposed methodology can be extended to include the dynamic characteristics and control schemes to enable integrated design of machines and controllers.
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Yigit, Ahmet S., and A. Galip Ulsoy. "Application of Nonlinear Receptance Coupling to Dynamic Stiffness Evaluation for Reconfigurable Machine Tools." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21397.
Анотація:
Abstract A systematic procedure is proposed to evaluate dynamic characteristics of design alternatives, for a Reconfigurable Machine Tool (RMT). The procedure is intended to be used in an automated design environment where various design alternatives are generated by kinematic synthesis based on a given task and specification. The evaluation procedure makes use of a substructuring method called nonlinear receptance coupling. The coupling method includes the effects of weakly nonlinear compliant joints through the use of describing functions for the nonlinearities involved. To demonstrate the utility of the proposed evaluation procedure design alternatives are generated based on a reduced order lumped parameter model of the RMT and examined with respect to the proposed criteria. It is shown that joint nonlinearities may affect dynamic stiffness considerably. It is also shown that the suggested criteria can distinguish various design alternatives with respect to their expected dynamic behavior.
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Spicer, J. Patrick, and Hector J. Carlo. "Simultaneous Scalable-Reconfigurable Manufacturing System Design and Inventory Control Policy Decision Making." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21083.
Анотація:
Scalable reconfigurable manufacturing systems (scalable-RMS) consist of standardized modular equipment that can be quickly added or removed to adjust the production capacity. Each modular machine, referred to as a scalable reconfigurable machine tool (scalable-RMT), is composed of identical modules that can be added to, or removed from the machine depending on its required throughput. In previous work, conceptual scalable-RMTs have been described. Additional scalable-RMTs are presented in this paper to highlight the applicability of this concept in manufacturing. As an extension to existing scalable-RMS literature, this paper incorporates multiple products in the system configuration design. Specifically, this paper proposes an integer programming based iterative algorithm for finding the minimum cost configuration of a multi-product system. It is shown that the proposed algorithm converges to the optimal solution under the majority of practical conditions. Then, a mathematical formulation to minimize the system investment and operational costs in a multi-product scalable-RMS is presented. A numerical example compares the solution obtained using the traditional approach of determining the system design and then the inventory control policy versus the proposed simultaneous approach. It is concluded that the simultaneous approach yields significant improvement over the traditional (decoupled) approach.
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Moon, Yong-Mo, and Sridhar Kota. "Synthesis of Reconfigurable Machine Tools With Screw Theory." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/mech-14066.
Анотація:
Abstract In this paper, we present a systematic methodology for designing Reconfigurable Machine Tools (RMTs). The synthesis methodology takes as input a set of functional requirements — a set of process plans and outputs a set of kinematically-viable reconfigurable machine tools that meet the given design specifications. We present a mathematical framework for synthesis of machine tools using a library of building blocks. The framework is rooted in (a) graph theoretic methods of enumeration of alternate structural configurations and (b) screw theory that enables us to manipulate matrix representations of motions to identify appropriate kinematic building blocks. The methodology described in this paper provides a mathematical framework to address dynamic stiffness, and accuracy prediction of the kinematically-viable designs that are generated by the synthesis procedure. This methodology has been implemented in a program, called PREMADE (PRogram for REconfigurable MAchine tool DEsign), and the results are validated against commercial machine tool designs.
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Kooli, Maha, Pascal Benoit, Giorgio Di Natale, Lionel Torres, and Volkmar Sieh. "Fault injection tools based on Virtual Machines." In 2014 9th International Symposium on Reconfigurable and Communication-Centric Systems-on-Chip (ReCoSoC). IEEE, 2014. http://dx.doi.org/10.1109/recosoc.2014.6861351.
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Ling, Catherine, Derek Yip-Hoi, and Yoram Koren. "Hole Pattern Identification in Gang Spindle Head Design for Reconfigurable Machining Systems." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/dac-14279.
Анотація:
Abstract A systematic methodology for automatic gang spindle head design through parallelism-based operation clustering is an important component in Reconfigurable Machining System (RmS)1 design. Such parallelism-based operation clusters as we refer to them, must satisfy a set of constraints in order to be processed simultaneously on a gang spindle head. A group of operations should be decomposed if any constraint is violated. In doing this, the identification of clusters with identical patterns can potentially lead to savings in machine design and reconfiguration costs. To identify these patterns manually is time consuming and prone to error. This paper presents a pattern identification algorithm that will recognize identical pattern clusters by first searching for translational vectors (or rotational vectors) and then extracting the appropriate sets of end-points. The algorithm automatically obtains all alternative solutions so that finding identical patterns on different faces of the part or on different parts within a part family can be implemented. This strategy maximizes the usage of identical spindles and/or machines. The cost associated with redesigning, testing, and reconfiguration is significantly reduced. Such a tool can be used by the system designer for gang spindle head design in the RmS domain.