Journal articles on the topic 'Reconfigurable machines tools (RMT)'
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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.
Abstract:
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.
2
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.
Abstract:
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.
Abstract:
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.
Abstract:
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.
5
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.
Abstract:
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.
6
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.
Abstract:
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.
7
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.
Abstract:
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.
8
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.
Abstract:
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.
9
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.
Abstract:
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.
10
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.
Abstract:
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.
11
Kant, Rajeev, L N Pattanaik, and Vijay Pandey. "Heuristic for Enabling Lean Characteristics in Cellular Manufacturing using Reconfigurable Machines." Asian Review of Mechanical Engineering 4, no. 1 (May 5, 2015): 27–30. http://dx.doi.org/10.51983/arme-2015.4.1.2390.
Abstract:
Due to the rigidness of cellular manufacturing system (CMS), it lacks adaptability which is the ability to respond to changing products, product mix and production capacity, hence loosing competency in dynamic manufacturing environment. Reconfigurable machine tools (RMTs) are the great means to propel flexibility in CMS to enable a high degree of system responsiveness to frequentchanges in cost effective way. In this paper, RMTs are used to exert lean characteristics in CMS by inheriting the desirable properties of RMTs. A heuristic is developed for embedding lean characteristics into machine cell design. The emphasis of this research is the formation of machine cells driven by specific product mix. An application example is included to illustrate the cellular model.
12
Yi, Guodong, Yang Wang, and Xin Zhao. "Evaluation and optimization of the design schemes of reconfigurable machine tools based on multiple-attribute decision-making." Advances in Mechanical Engineering 10, no. 12 (December 2018): 168781401881305. http://dx.doi.org/10.1177/1687814018813054.
Abstract:
A reconfigurable manufacturing system is one designed for rapid change in its structure, to quickly adjust its production capacity and functionality within a part family. Aiming at the diversity, cost and complexity of reconfiguration design, a method for evaluating the design scheme of a reconfigurable machine tool based on VIKOR is proposed. The module similarity between a reconfigurable machine tool and a prototype machine tool is defined, and on this basis, three quantitative evaluation indicators are established as follows: the module chain similarity determines the difficulty, effort, time and efficiency of machine tool reconstruction; the module interface complexity determines the feasibility and complexity of the disassembly and assembly of the reconfiguration module; and the reconfiguration cost determines the economic advantages of reconfigurable machines relative to fixed-structure equipment. According to three indicators, a multi-attribute decision-making method based on VIKOR is used to evaluate, calculate and sort the design scheme set of the reconfigurable machine tool, and the optimal feasible solution is obtained. An example of the reconfiguration design of a machine tool is analysed to verify the validity and feasibility of the proposed method compared with the methods of simple average weighting and technique for order preference by similarity to an ideal solution.
13
DeGaspari, John. "All in the Family." Mechanical Engineering 124, no. 02 (February 1, 2002): 56–58. http://dx.doi.org/10.1115/1.2002-feb-5.
Abstract:
This article focuses on reconfigurable machining systems. These systems have lately caught the attention of some manufacturers who need something that is more flexible than a dedicated line and produces goods faster than a shop of CNC machines. The lines are called reconfigurable because they consist of modules and, once they are programmed, can be switched quickly to turn out different, but similar pieces from a family of products. Proponents say that reconfigurable machining systems have carved out a niche between two other alternatives—dedicated transfer lines, which are optimized for producing large volumes of specific parts, and computer numerical control machine tools, which have a high degree of flexibility but are slower to finish products. Reconfigurable machining systems have been developed for the automotive industry, for instance, as car companies have increasingly outsourced their production to tier-one suppliers and demanded price reductions.
14
Kahloul, Laid, Samir Bourekkache, Karim Djouani, Allaoua Chaoui, and Okba Kazar. "Using High Level Petri Nets in the Modelling, Simulation and Verification of Reconfigurable Manufacturing Systems." International Journal of Software Engineering and Knowledge Engineering 24, no. 03 (April 2014): 419–43. http://dx.doi.org/10.1142/s0218194014500168.
Abstract:
In Reconfigurable Manufacturing Systems (RMSs), the structure of the system can be changed during execution of the system. This reconfiguration can be motivated by a new requirement in the production process, or to avoid some problems caused by machines breakdowns. These systems offer a high flexibility leading to more productivity and efficiency. However, their design is more complicated implying new techniques and paradigms. The use of formal high level Petri Nets offers the ability to design these systems and to analyse or prove their properties. In this paper, we apply Reconfigurable Object Nets (RONs) for the modelling, simulation and analysis of reconfigurable manufacturing systems. We propose a formal approach, where the reconfiguration is specified as graph transformations, the simulation is realized using the RON-tool, and the analysis exploits some software tools such as TINA-tool and PIPE-tool.
15
Bortolini, Marco, Lucia Botti, Francesco Gabriele Galizia, and Alberto Regattieri. "Bi-Objective Design and Management of Reconfigurable Manufacturing Systems to Optimize Technical and Ergonomic Performances." Applied Sciences 11, no. 1 (December 29, 2020): 263. http://dx.doi.org/10.3390/app11010263.
Abstract:
In the last decades, Reconfigurable Manufacturing Systems (RMSs) rose as an emerging manufacturing strategy matching the modern industrial and market requirements asking for a wide variety of products in flexible batches. A traditional reconfigurable manufacturing environment consists of dynamic cells, called Reconfigurable Machine Cells (RMCs), including a set of machines called Reconfigurable Machine Tools (RMTs). Such machines are characterized by fixed elements, i.e., basic modules, and dynamic elements, i.e., auxiliary modules, allowing them to perform different operations. Despite their automation level, these systems require the intervention of the human operators in performing specific tasks, e.g., handling of the auxiliary modules from the warehouse to the RMTs and their assembly/disassembly to/from the RMTs. This issue rises relevant ergonomic and safety questions due to the human–machine collaboration. Following this stream, this paper proposes and applies a bi-objective optimization model for the design and management of RMSs. The technical objective function minimizes the reconfiguration time, i.e., the time needed to equip the RMTs with the required auxiliary modules, and the part and auxiliary module travel time among the RMCs. The ergonomic objective function minimizes the repetitive movements performed by the human operators during the working activities according to the ISO 11228-3 standard. Results show the existence of a good trade-off between the two objective functions, proving the possibility to improve the ergonomic conditions of the human operators without excessively increasing the total time needed for RMTs reconfiguration and for part and auxiliary module travelling.
16
Cheng, Yuan-Ming. "Machining with a Precision Five-Axis Machine Tools Created by Combining a Horizontal Parallel Three-Axis Motion Platform and a Three-Axis Machine Tools." Materials 15, no. 6 (March 18, 2022): 2268. http://dx.doi.org/10.3390/ma15062268.
Abstract:
Five-axis working machines are applied in the high-precision machining of complex convex surfaces. Therefore, this study integrated a horizontal parallel three-axis motion platform and a three-axis machine tools to create a reconfigurable precision five-axis machine tools (RPFMT). A DELTA OPEN computer numerical control controller was used as the control system architecture. A human–machine interface and programmable controller were incorporated into the developed tool to achieve automatic online measurement. A suitable cutting tool was selected to calculate the five-axis NC machining code for a complex convex surface. The NC codes were input into the LabVIEW software for five-axis postprocessing conversion. A concave workpiece was cut through rough and finishing machining to verify the accuracy of the produced RPFMT.
17
Kurniadi, Kezia Amanda, and Kwangyeol Ryu. "Development of Multi-Disciplinary Green-BOM to Maintain Sustainability in Reconfigurable Manufacturing Systems." Sustainability 13, no. 17 (August 24, 2021): 9533. http://dx.doi.org/10.3390/su13179533.
Abstract:
The reconfigurable manufacturing system (RMS) appears to be eco-friendly while coping with rapidly changing market demands. However, there remains a lack of discussion or research regarding sustainability or environment-friendly functions within RMS. In this study, the reconfiguration planning problem is introduced to represent the core issues within the RMS. Reconfiguration occurs depending on new demands or conditions in the company by reconfiguring machines, such as removing, adding, or changing parts, giving considerable consideration to arrangement of machines, known as configurations in RMS. Therefore, reconfiguration process is always strongly connected to cost, energy consumption, and, more importantly, data management. The complexity of reconfiguration, product variation, and development processes requires tools that are capable of managing multi-disciplinary bill-of-material(BOM) or product data and providing a better collaboration support for data/information tracking while maintaining sustainability. This paper proposes a multi-disciplinary green bill-of-material (MDG-BOM)—an improved Green-BOM concept—with an additional multi-disciplinary feature to minimize emissions and hazardous materials during product development, as well as manage product information across multiple disciplines during the reconfiguration process. A smart spreadsheet for managing MDG-BOM was developed to allow multiple departments to integrate multiple sources of CAD design data and monitor/track changes throughout each step of the process.
18
Batke, Christoph, Karl Heinz Wurst, Armin Lechler, and Alexander Verl. "The Printed Machine Tool for Micro Machining." Advanced Materials Research 1018 (September 2014): 433–40. http://dx.doi.org/10.4028/www.scientific.net/amr.1018.433.
Abstract:
Machine tools for micro machining are so far not adapted to work piece sizes and process forces. They feature hardly any modularity and do not allow reconfiguration in a significant process change. One possibility to adapt the machines is to produce them from plastic or composite materials through generative methods. This “printed” machine is a reconfigurable, monolithic module, in which drives are integrated. By a cooperative motion generation, larger workspaces can be realized while the installation spaces decreases. This gives the possibility to use alternative drive technologies for example piezo-drives. Based on these methods, two small generatively produced machine tools are designed. These machine tools use two different drive principles. The first machine tool is equipped with ball screw drives which are cost efficient and space saving. The second machine tool uses piezo-actuators, which are very dynamic in motion generation. Further has to be examined, which tolerances and rigidities are needed at critical points and which parts can be produced generatively and which in a conventional way.
19
Gola, Arkadiusz, Zbigniew Pastuszak, Marcin Relich, Łukasz Sobaszek, and Eryk Szwarc. "Scalability analysis of selected structures of a reconfigurable manufacturing system taking into account a reduction in machine tools reliability." Eksploatacja i Niezawodnosc - Maintenance and Reliability 23, no. 2 (February 8, 2021): 242–52. http://dx.doi.org/10.17531/ein.2021.2.4.
Abstract:
Scalability is a key feature of reconfigurable manufacturing systems (RMS). It enables fast and cost-effective adaptation of their structure to sudden changes in product demand. In principle, it allows to adjust a system's production capacity to match the existing orders. However, scalability can also act as a "safety buffer" to ensure a required minimum level of productivity, even when there is a decline in the reliability of the machines that are part of the machine tool subsystem of a manufacturing system. In this article, we analysed selected functional structures of an RMS under design to see whether they could be expanded should the reliability of machine tools decrease making it impossible to achieve a defined level of productivity. We also investigated the impact of the expansion of the system on its reliability. To identify bottlenecks in the manufacturing process, we ran computer simulations in which the course of the manufacturing process was modelled and simulated for 2-, 3-, 4- and 5-stage RMS structures using Tecnomatix Plant Simulation software.
20
Saldaña, Manuel, Arun Patel, Hao Jun Liu, and Paul Chow. "Using Partial Reconfiguration and Message Passing to Enable FPGA-Based Generic Computing Platforms." International Journal of Reconfigurable Computing 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/127302.
Abstract:
Partial reconfiguration (PR) is an FPGA feature that allows the modification of certain parts of an FPGA while the rest of the system continues to operate without disruption. This distinctive characteristic of FPGAs has many potential benefits but also challenges. The lack of good CAD tools and the deep hardware knowledge requirement result in a hard-to-use feature. In this paper, the new partition-based Xilinx PR flow is used to incorporate PR within our MPI-based message-passing framework to allow hardware designers to createtemplate bitstreams, which are predesigned, prerouted, generic bitstreams that can be reused for multiple applications. As an example of the generality of this approach, four different applications that use the same template bitstream are run consecutively, with a PR operation performed at the beginning of each application to instantiate the desired application engine. We demonstrate a simplified, reusable, high-level, and portable PR interface for X86-FPGA hybrid machines. PR issues such as local resets of reconfigurable modules and context saving and restoring are addressed in this paper followed by some examples and preliminary PR overhead measurements.
21
Azulay, Hay, James K. Mills, and Beno Benhabib. "A Multi-Tier Design Methodology for Reconfigurable Milling Machines." Journal of Manufacturing Science and Engineering 136, no. 4 (May 21, 2014). http://dx.doi.org/10.1115/1.4027315.
Abstract:
Reconfigurable Machine Tools (RMTs) have been developed in response to agile flexible manufacturing demands. Current design methodologies for RMTs support modular reconfigurability in which a machine configuration is assembled for a given part. In this paper, on the other hand, reconfigurability relies on redundancy, namely, a desired RMT configuration is obtained through topological reconfiguration by locking/unlocking degrees-of-freedom (dof). Thus, in order to design a Redundant Reconfigurable Machine Tool (RRMT) with all of its dof already included, a new multi–tier optimization based design methodology was developed. The design is formulated for the efficient selection of the best architecture from a set of serial/parallel/hybrid solutions, while considering the redundant reconfigurability effect on performance. The viability of the methodology is demonstrated herein via a design test case of a Parallel Kinematic Mechanism (PKM)-based Redundant Reconfigurable meso-Milling Machine Tool (RRmMT) that can attain high stiffness at the high feed-rate required in meso-milling.
22
Singh, Ashutosh, Mohammad Asjad, and Piyush Gupta. "A conceptual development of reconfigurable drill machine tool (RDMT)." SN Applied Sciences 1, no. 10 (September 3, 2019). http://dx.doi.org/10.1007/s42452-019-1194-9.
23
Lee, Sungcheul, and Jong-Kweon Park. "Experimental Verification of Dynamic Behavior of a Capsule-Type Modular Machine Tool for Multifunctional Processes." Journal of Manufacturing Science and Engineering 140, no. 1 (November 16, 2017). http://dx.doi.org/10.1115/1.4037999.
Abstract:
A capsule-type modular machine tool was developed, which was capable of multifunctional processes with a single setup. This mechanism was designed according to the concept of a reconfigurable machine tool (RMT), which can transform from a machining center to a lathe, and is capable of multiple functional processes, such as laser, milling, and grinding processes. After addressing the kinematics of the machine, a static structural analysis was performed and some ribs were added to enhance the stiffness. A frequency response function (FRF) simulation was conducted on the modified machine and natural frequencies were determined to avoid resonance in processing. Then, an FRF test was performed to find the actual natural frequencies, to confirm the simulation results. After investigating the natural frequencies, high-speed machining was performed to make 300 μm sized patterns.
24
Zhang, Dan, and Zhuming Bi. "DEVELOPMENT OF RECONFIGURABLE PARALLEL KINEMATIC MACHINES USING MODULAR DESIGN APPROACH." Proceedings of the Canadian Engineering Education Association (CEEA), August 10, 2011. http://dx.doi.org/10.24908/pceea.v0i0.3866.
Abstract:
This paper introduces the theoretical design of reconfigurable machine tools using modular design approach. First, the general concept of modular robot and its growing need is introduced. Second, the design of reconfigurable parallel kinematic machines is discussed and the geometric modeling of such figures is presented and explained, and potential applications are described. Finally, a case study for proposed structure is conducted for its kinematic modeling and design optimization and some results are concluded.
25
Sibanda, Vennan, Khumbulani Mpofu, and John Trimble. "Methodology for the design of a reconfigurable guillotine shear and bending press machine (RGS&BPM)." Journal of Engineering, Design and Technology ahead-of-print, ahead-of-print (June 14, 2021). http://dx.doi.org/10.1108/jedt-06-2020-0254.
Abstract:
Purpose In manufacturing, dedicated machine tools and flexible machine tools are failing to satisfy the ever-changing manufacturing demands of short life cycles and dynamic nature of products. These machines are limited when new product designs are introduced. The solution lies in developing responsive machines that can be adjusted or be changed functionally when these change requirements arise. These machines are reconfigurable machines which are becoming the new focus, as they rapidly respond to product variety and volume changes. A sheet metal working machine known as a reconfigurable guillotine shear and bending press machine (RGS&BPM) has been developed. The purpose of this paper is to present a methodology, function-oriented design approach (FODA), which was developed for the design of the RGS&BPM. Design/methodology/approach The design of the machine is based on the six principles of reconfigurable manufacturing systems (RMSs), namely, modularity, scalability integrability, convertibility, diagnosability and customisability. The methodology seeks to optimise the design process of the RGS&BPM through a design of modules that make up the machine, enable its conversion and reconfiguration. The FODA is focussed on function identification to select the operational function required. Two main functions are recognised for the machine, these being cutting and bending; hence, the design revolves around these two and reconfigurability. Findings The developed design methodology was tested in the design of a prototype for the reconfigurable guillotine shear and bending press machine. The prototype is currently being manufactured and will be subjected to functional tests once completed. This paper is being presented not only to present the methodology by to show and highlight its practical applicability, as the prototype manufacturers have been enthusiastic about this new approach. Research limitations/implications The research was limited to the design methodology for the RGS&BPM, the machine which has been designed to completion using this methodology, with prototype being manufactured. Practical implications This study presents critical steps and considerations in the development of reconfigurable machines. The main thrust being to explore the best possibility of developing the machines with dual functionality that will assist in availing the technology to manufacturer. As the machine has been development, the success of the design can be directly attributed to the FODA methodology, among other contributing factors. It also highlights the significance of the principles of RMS in reconfigurable machine design. Social implications The RGS&BM machine is an answer for the small-to-medium enterprises (SMEs), as the machine replaces two machines with one, and the methodology ensures its affordable design. It contributes immensely to the machine availability by eliminating trial and error approaches. Originality/value This study presents a new approach to the design of reconfigurable dual machines using principles of RMS. As the targeted market is the SME, it is not limited to that as any entrepreneur may use the machine to their advantage. The design methodology presented contributes to the body of knowledge in dual reconfigurable machine tool design.
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Chae, J., S. S. Park, and S. Lin. "SUBSTRUCTURE COUPLING WITH JOINT IDENFICATION FOR RECONFIGURABLE MANUFACTURING SYSTEMS." Proceedings of the Canadian Engineering Education Association (CEEA), August 15, 2011. http://dx.doi.org/10.24908/pceea.v0i0.3956.
Abstract:
Today’s manufacturing industries require rapid production of small batch sized products with great accuracy and productivity. When compared with traditional dedicated systems, reconfigurable manufacturing systems (RMS) offer rapid change in system configurations, machines and controls to adjust to flexible demands. This can be achieved by combining modular substructures together with different functionalities depending on requirements. In this study, a method of assembling the known dynamics of substructures is investigated through the receptance coupling approach. The classical receptance technique is enhanced by identifying the joint dynamics between substructures through experimental and finite element (FE) analyses. This identification method also includes the translational and rotational degrees of freedom responses, which represent the mass, spring, and damping elements of the joint. The determination of rotational responses can be very challenging, and the proposed method solves the rotational responses with two separate experimental measurements using gauge tools. This novel identification method overcomes the limitations posed by other identification methods, by minimizing numerical errors and problems associated with convergence. Experimental tests, using a fastener joint, were performed to verify the effectiveness of the joint identification method.
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Pattanaik, Laxmi Narayan, and Rajeev Kant. "Optimization of a multi-objective lean assembly problem with reconfigurable machine cells." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, July 12, 2022, 095440542211118. http://dx.doi.org/10.1177/09544054221111895.
Abstract:
Manufacturing sector is regularly facing the challenges caused due to high market dynamics and mass customization. Traditionally designed machine cells fail to address this issue due to lack of flexibility in capacity and functionality. However, the benefits of cell based production can be achieved by changing the machines involved and the design of cells. This paper presents a hybrid model of machine cells comprising of reconfigurable machine tools (RMTs) that are acting as part feeders for a lean assembly line of discrete products. The strategies of lean manufacturing to maintain the Takt time and synchronized one-piece-flow are considered in the model. A multi-objective optimization problem is formulated and solved to minimize the inter-cellular part movement, the error for Takt time among machine cells and the total reconfiguration time of the RMTs using NSGA-II metaheuristic. A numerical case example for the model is solved using MATLAB© and illustrated along with computational steps and Pareto optimal solutions.