The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Z Fan - One of the best experts on this subject based on the ideXlab platform.

  • semisolid Metal Processing
    International Materials Reviews, 2002
    Co-Authors: Z Fan
    Abstract:

    AbstractSemisolid Metal (SSM) Processingis a relatively new technology for Metal forming. Different from the conventional Metal forming technologies which use either solid Metals (solid state Processing) or liquid Metals (casting) as starting materials, SSM Processing deals with semisolid slurries, in which non-dendritic solid particles are dispersed in a liquid matrix. Semisolid Metal slurries exhibit distinctive rheological characteristics: the steady state behaviour is pseudoplastic (or shear thinning), while the transient state behaviour is thixotropic. All the currently available technologies for SSM Processing have been developed based on those unique rheological properties, which in turn originate from their non-dendritic microstructures. Year 2001 marks the 30th anniversary of the concept of SSM Processing. Today, SSM Processing has established itself as a scientifically sound and commercially viable technology for production of Metallic components with high integrity, improved mechanical properti...

Gerhard Hirt - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid Sheet Metal Processing Center
    60 Excellent Inventions in Metal Forming, 2015
    Co-Authors: David Bailly, Laura Conrads, Gerhard Hirt
    Abstract:

    Incremental Sheet Forming (ISF) is a flexible sheet forming process suitable for single part and small series production. To form a component, a CNC controlled generic forming tool is moved along the contours of the desired shape and locally induces plastic deformations. Hence, the final shape of the component is obtained stepwise as a sum of all localized plastic deformations. However, the basic process shows several process limits, such as long process time, material thinning and limited geometrical accuracy. Here, a Hybrid Sheet Metal Processing Center is presented that addresses these process limits. It allows for combining stretch forming with ISF, performing laser assisted ISF as well as pre- and post-Processing in one concerted machine setup.

  • Comprar Thixoforming: Semi-solid Metal Processing | Gerhard Hirt | 9783527322046 | Wiley
    2009
    Co-Authors: Gerhard Hirt, Reiner Kopp
    Abstract:

    Tienda online donde Comprar Thixoforming: Semi-solid Metal Processing al precio 165,56 € de Gerhard Hirt | Reiner Kopp, tienda de Libros de Medicina, Libros de Quimica - Quimica

  • thixoforming semi solid Metal Processing
    2009
    Co-Authors: Gerhard Hirt, Reiner Kopp
    Abstract:

    Preface SEMI-SOLID FORMING OF ALUMINIUM AND STEEL ' INTRODUCTION AND OVERVIEW Introduction Early Work on Flow Behaviour and Technology Development Today's Technologies of Semi-Solid Metal Forming PART I: Material Fundamentals of Metal Forming in the Semi-Solid State MetalLURGICAL ASPECTS OF SSM Processing Introduction Temperature Sensitivity S* and Solid-Liquid Fraction Slurry Formation in the Rheo- and Thixo-Routes Proneness to Segregation and Hot Tearing Impact of Variations in Alloy Composition Conclusion MATERIAL ASPECTS OF STEEL THIXOFORMING Introduction Background Alloying Systems Structural Parameter Development and Material Selection Melting Behaviour Microstructure Analysis and Material Properties Conclusions DESIGN OF Al AND Al-Li ALLOYS FOR THIXOFORMING Production of Raw Material for Thixoforming Processes Chemical Grain Refinement of Commercial Thixoalloys Fundamentals of Aluminium-Lithium Alloys Development of Aluminium-Lithium-Alloys for Semi-Solid Processing Consideration of the Forming Pressure on Thixoalloy Development Preparation of Principle Components from Al-Li Thixoalloys Production of Al-Li Demonstrators by Rheocasting Recycling of Aluminium-Lithium Alloys from Thixoforming Processes THERMOCHEMICAL SIMULATION OF PHASE FORMATION Methods and Objectives Calculations for the Tool Steel X210CrW12 Calculations for the Bearing Steel 100Cr6 Calculations for the High-Speed Steel HS6-5-2 PART II: Modelling the Flow Behaviour of Semi-Solid Metal Alloys MODELLING THE FLOW BEHAVIOUR OF SEMI-SOLID Metal ALLOYS Empirical Analysis of the Flow Behaviour Numerical Modelling of Flow Behaviour Simulation of Cooling Channel A PHYSICAL AND MICROMECHEMICAL MODEL FOR SEMI-SOLID BEHAVIOUR Introduction Basic Concepts of Micromechanical and Homogenization Modelling Semi-Solid Behaviour Results and Discussion Conclusion PART III: Tool Technologies for Forming of Semi-Solid Metals TOOL TECHNOLOGIES FOR FORMING OF SEMI-SOLID MetalS Introduction ' Suitable Tool Concepts for the Thixoforming Process Thin-Film PVD/PECVD Coating Concepts for Die Materials PVD and PECVD Coating Technologies Multifunctional PVD Composites for Thixoforming Moulds Developing Al2O3 PECVD Coatings for Thixoforming Moulds Bulk Ceramic Forming Tools Conclusions and Perspectives PART IV: Forming of Semi-Solid Metals RHEOCASTING OF ALUMINIUM ALLOYS AND THIXOCASTING OF STEELS Casting of Semi-Solid Slurries SSM Casting Processes Thixocasting of Steel Alloys Rheoroute Assessment and Outlook THIXOFORGING AND RHEOFORGING OF STEEL AND ALUMINIUM ALLOYS Introduction Forging in the Semi-Solid State Heating and Forming Operations Simulation of the Thixoforming Process Conclusion THIXOEXTRUSION Introduction State of the Art Tool Concepts Isothermal Thixoextrusion Non-Isothermal Thixoextrusion Conclusion

W Ding - One of the best experts on this subject based on the ideXlab platform.

  • application of ultrasonic vibrations in welding and Metal Processing a status review
    Journal of Manufacturing Processes, 2017
    Co-Authors: S Kumar, C S Wu, G K Padhy, W Ding
    Abstract:

    Abstract This review paper aims to introduce systematic in-depth analysis of diversified aspects of ultrasonic application in Metal joining and Processing including its limitations, future prospects and assessments. Allied welding and Metal Processing technologies employing ultrasonic vibrations either as the primary source to accomplish the intended operation or as an assistant source to improve the operation efficiency and product quality are classified and discussed. The detailed state-of the art, experimentation and progresses of the ultrasonic vibrations and its applications in the above areas are comprehensively examined, evaluated and presented for exhaustive understandings of its physical mechanism. The ultrasonic vibrations assisted processes claim several advantages such as improved mechanical properties, enlarged process window, higher heat generation, better material mixing and enhanced turbulence etc. over the conventional processes which lead to the remarkable and globalized applications of ultrasonic vibrations in the welding and its allied areas in the present century.

Tatsuhiko Sakaguchi - One of the best experts on this subject based on the ideXlab platform.

  • Nesting Scheduling in Sheet Metal Processing Based on Coevolutionary Genetic Algorithm in Different Environments
    International journal of automation technology, 2018
    Co-Authors: Tatsuhiko Sakaguchi, Kohki Matsumoto, Naoki Uchiyama
    Abstract:

    In sheet Metal Processing, nesting and scheduling are important factors affecting the efficiency and agility of manufacturing. The objective of nesting is to minimize the waste of material, while that of scheduling is to optimize the Processing sequence. As the relation between them often becomes a trade-off, they should be considered simultaneously for the efficiency of the total manufacturing process. In this study, we propose a co-evolutionary genetic algorithm-based nesting scheduling method. We first define a cost function as a fitness value, and then we propose a grouping method that forms gene groups based on the Processing layout and Processing time. Finally, we validate the effectiveness of the proposed method through computational experiments.

  • A scheduling method using genetic algorithm and dispatching rule for sheet Metal Processing
    2016 International Symposium on Flexible Automation (ISFA), 2016
    Co-Authors: Tatsuhiko Sakaguchi, Tatsuya Tanaka, Yoshiaki Shimizu, Naoki Uchiyama
    Abstract:

    In the sheet Metal Processing, nesting and scheduling are important design and operational tasks, respectively. The optimal cutting layout is determined by nesting for reducing waste of material while the optimal sequence is determined by scheduling for increasing efficiency of operational activities. Since we often encounter trade-offs regarding to their decision-making, they should be considered simultaneously. Accordingly, we previously proposed an integrated method of nesting and scheduling under a certain system boundary. In order to realize more efficient manufacturing, the punching process, which is the first process of sheet Metal Processing, should be considered. To work with this problem, in this study, we have extended our previous method by applying genetic algorithm for the optimization of sequence of punching process which depends on the cutting layout. Numerical experiment is provided to validate the effectiveness of the proposed method.

  • A Heuristic Approach for Integrated Nesting and Scheduling in Sheet Metal Processing
    2015
    Co-Authors: Tatsuhiko Sakaguchi, Hayato Ohtani, Yoshiaki Shimizu
    Abstract:

    In recent years, sustainable and agile manufacturing is aimed at in many manufacturing industries. Reducing the waste of raw materials and managing the production schedule are important factors for such manufacturing. Nesting is an activity designing a cutting layout while scheduling is one managing operational procedures. Noting such nesting and scheduling in sheet Metal Processing, we need to consider those simultaneously for increasing the entire efficiency. This is because there often occurs a trade-off between them. To resolve such problem, we previously proposed an integrated method of nesting and scheduling. In order to enhance the scheduling ability that was insufficient in our method, this study extends the idea through a heuristic approach. Actually, we apply a local search to update the initial schedule which is decided by EDD based dispatching rule and manage it in terms of the criteria referring to the bottleneck process. Computational experiment is provided to validate the effectiveness of the proposed method.

  • APMS (1) - A Heuristic Approach for Integrated Nesting and Scheduling in Sheet Metal Processing
    Advances in Production Management Systems: Innovative Production Management Towards Sustainable Growth, 2015
    Co-Authors: Tatsuhiko Sakaguchi, Hayato Ohtani, Yoshiaki Shimizu
    Abstract:

    In recent years, sustainable and agile manufacturing is aimed at in many manufacturing industries. Reducing the waste of raw materials and managing the production schedule are important factors for such manufacturing. Nesting is an activity designing a cutting layout while scheduling is one managing operational procedures. Noting such nesting and scheduling in sheet Metal Processing, we need to consider those simultaneously for increasing the entire efficiency. This is because there often occurs a trade-off between them. To resolve such problem, we previously proposed an integrated method of nesting and scheduling. In order to enhance the scheduling ability that was insufficient in our method, this study extends the idea through a heuristic approach. Actually, we apply a local search to update the initial schedule which is decided by EDD based dispatching rule and manage it in terms of the criteria referring to the bottleneck process. Computational experiment is provided to validate the effectiveness of the proposed method.

  • A Scheduling Method With Considering Nesting for Sheet Metal Processing
    ASME ISCIE 2012 International Symposium on Flexible Automation, 2012
    Co-Authors: Tatsuhiko Sakaguchi, Tatsuro Murakami, Shohei Fujita, Yoshiaki Shimizu
    Abstract:

    In sheet Metal Processing, several parts are cut from one sheet Metal by punching process. Before punching process, layout of parts is decided by the nesting. If the parts are arranged as compactly as possible into one sheet Metal, the waste of raw materials can be reduced. Therefore, the nesting is essential for optimizing the layout of parts. However, if the nesting is executed without considering the following manufacturing processes, there cause various inefficiencies all over the processes. Therefore, the nesting and the scheduling should be considered simultaneously for the efficient manufacturing. With this point of view, in this study, we propose an integrated method in terms of scheduling and nesting. Moreover, we verified the effectiveness of the proposed method through some computational experiments.Copyright © 2012 by ASME

Yoshiaki Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • A scheduling method using genetic algorithm and dispatching rule for sheet Metal Processing
    2016 International Symposium on Flexible Automation (ISFA), 2016
    Co-Authors: Tatsuhiko Sakaguchi, Tatsuya Tanaka, Yoshiaki Shimizu, Naoki Uchiyama
    Abstract:

    In the sheet Metal Processing, nesting and scheduling are important design and operational tasks, respectively. The optimal cutting layout is determined by nesting for reducing waste of material while the optimal sequence is determined by scheduling for increasing efficiency of operational activities. Since we often encounter trade-offs regarding to their decision-making, they should be considered simultaneously. Accordingly, we previously proposed an integrated method of nesting and scheduling under a certain system boundary. In order to realize more efficient manufacturing, the punching process, which is the first process of sheet Metal Processing, should be considered. To work with this problem, in this study, we have extended our previous method by applying genetic algorithm for the optimization of sequence of punching process which depends on the cutting layout. Numerical experiment is provided to validate the effectiveness of the proposed method.

  • A Heuristic Approach for Integrated Nesting and Scheduling in Sheet Metal Processing
    2015
    Co-Authors: Tatsuhiko Sakaguchi, Hayato Ohtani, Yoshiaki Shimizu
    Abstract:

    In recent years, sustainable and agile manufacturing is aimed at in many manufacturing industries. Reducing the waste of raw materials and managing the production schedule are important factors for such manufacturing. Nesting is an activity designing a cutting layout while scheduling is one managing operational procedures. Noting such nesting and scheduling in sheet Metal Processing, we need to consider those simultaneously for increasing the entire efficiency. This is because there often occurs a trade-off between them. To resolve such problem, we previously proposed an integrated method of nesting and scheduling. In order to enhance the scheduling ability that was insufficient in our method, this study extends the idea through a heuristic approach. Actually, we apply a local search to update the initial schedule which is decided by EDD based dispatching rule and manage it in terms of the criteria referring to the bottleneck process. Computational experiment is provided to validate the effectiveness of the proposed method.

  • APMS (1) - A Heuristic Approach for Integrated Nesting and Scheduling in Sheet Metal Processing
    Advances in Production Management Systems: Innovative Production Management Towards Sustainable Growth, 2015
    Co-Authors: Tatsuhiko Sakaguchi, Hayato Ohtani, Yoshiaki Shimizu
    Abstract:

    In recent years, sustainable and agile manufacturing is aimed at in many manufacturing industries. Reducing the waste of raw materials and managing the production schedule are important factors for such manufacturing. Nesting is an activity designing a cutting layout while scheduling is one managing operational procedures. Noting such nesting and scheduling in sheet Metal Processing, we need to consider those simultaneously for increasing the entire efficiency. This is because there often occurs a trade-off between them. To resolve such problem, we previously proposed an integrated method of nesting and scheduling. In order to enhance the scheduling ability that was insufficient in our method, this study extends the idea through a heuristic approach. Actually, we apply a local search to update the initial schedule which is decided by EDD based dispatching rule and manage it in terms of the criteria referring to the bottleneck process. Computational experiment is provided to validate the effectiveness of the proposed method.

  • A Scheduling Method With Considering Nesting for Sheet Metal Processing
    ASME ISCIE 2012 International Symposium on Flexible Automation, 2012
    Co-Authors: Tatsuhiko Sakaguchi, Tatsuro Murakami, Shohei Fujita, Yoshiaki Shimizu
    Abstract:

    In sheet Metal Processing, several parts are cut from one sheet Metal by punching process. Before punching process, layout of parts is decided by the nesting. If the parts are arranged as compactly as possible into one sheet Metal, the waste of raw materials can be reduced. Therefore, the nesting is essential for optimizing the layout of parts. However, if the nesting is executed without considering the following manufacturing processes, there cause various inefficiencies all over the processes. Therefore, the nesting and the scheduling should be considered simultaneously for the efficient manufacturing. With this point of view, in this study, we propose an integrated method in terms of scheduling and nesting. Moreover, we verified the effectiveness of the proposed method through some computational experiments.Copyright © 2012 by ASME