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Dunbing Tang - One of the best experts on this subject based on the ideXlab platform.

  • Feature-based metal Stamping Part and process design. Part I: stampability evaluation
    International Journal of Production Research, 2007
    Co-Authors: Dunbing Tang
    Abstract:

    It is essential to devise a representation scheme for the metal Stamping Part design which allows the designer to capture and reason the design information, and ultimately, to take various considerations into account and make evaluation decisions. In our research, the feature-based approach is used to represent the metal Stamping Part, and feature-based metal Stamping Part and process design has been studied and presented in a two-Part paper. This is the first of a two-Part paper focusing on stampability evaluation. In Part II a feature-based Stamping process planning approach is investigated. This paper presents a feature- and knowledge-based stampability evaluation system. Tasks of this research include identification of the aims, criteria, and procedure of stampability evaluation, as well as the formalization of the stampability evaluation knowledge. Stampability evaluation is classified into stampability verification and stampability measurement. Stampability verification is used to determine whether ...

  • Feature-based metal Stamping Part and process design. Part II: Stamping process planning
    International Journal of Production Research, 2007
    Co-Authors: Dunbing Tang
    Abstract:

    In metal Stamping development, Stamping process planning plays quite an important role for the related die design. As mentioned in Part-I [Feature-based metal Stamping Part and process design. Part 1: stampability evaluation, 2007, 45, 2673–2695], the feature can encapsulate comprehensive engineering information; this paper proposes to realize Stamping process planning based on feature mapping. A feature mapping system, between a Stamping design feature space and a Stamping process feature space, has been presented. The inherent mechanism of such feature mapping has been investigated with formal representations. The substance of feature mapping is the processing of related knowledge and information. Mapping rules are established to generate the Stamping operation and Stamping direction. Four mapping manners (direct mapping, conjugate mapping, syncretic mapping, and sequential mapping) are presented for generating the form of process feature, through geometrical information transformation from design featu...

  • CSCWD - Agent-based System for Collaborative Stamping Part Design
    2006 10th International Conference on Computer Supported Cooperative Work in Design, 2006
    Co-Authors: Dunbing Tang
    Abstract:

    This paper reports on a collaborative design environment to facilitate active die-maker involvement into metal Stamping Part design. Using the agent-based approach, a multi-agent based system is constructed to integrate die-maker's activities into customer Part design process within a collaborative and concurrent environment. The overall architecture incorporates three agent communities: Part design agent, die-maker involvement agent, and coordination agent. Each agent community has a facilitator which provides an intermediary between a local collection of sub-agents and remote agents through two main services: routing outgoing messages to the appropriate destinations and translating incoming messages for consumption. A KQML/XML communication and data exchange method between agents is proposed. A case study is presented to illustrate how the die-maker is involved and cooperates with the Part designer to make an optimal Stamping Part design

  • Qualitative and quantitative cost analysis for sheet metal Stamping
    International Journal of Computer Integrated Manufacturing, 2004
    Co-Authors: Dunbing Tang, Walter Eversheim, Günther Schuh
    Abstract:

    This research paper presents a qualitative and quantitative cost analysis system for sheet metal Stamping development at an early design stage. First, the authors identify problems in the traditional metal Stamping Part and die development processes and outline the need for performance of concurrent Stamping Part design in order to achieve cost effectiveness that accommodates the concept of concurrent engineering. Based on feature-based modelling, a systematic method has been proposed to qualitatively analyse Stamping costs through the design stages according to Part information availability. The direct relationship existing between Part features and cost factors is analysed in detail. Through feature-based qualitative cost analysis, the designer can identify the Part attributes that significantly increase the die construction cost and redesign such Parts as early in the process as possible. In addition, an algorithmic method is presented to estimate the Stamping die cost quantitatively when the Stamping ...

  • An agent-based collaborative design system to facilitate active die-maker involvement in Stamping Part design
    Computers in Industry, 2004
    Co-Authors: Dunbing Tang
    Abstract:

    This paper reports on a collaborative design environment to facilitate active die-maker involvement in metal Stamping product development. First, the role of die-maker in the metal Stamping development process chain is analyzed comprehensively. The author takes the view that the die-maker should be involved in new product development processes as early as possible to enable concurrent engineering practice in metal Stamping development. Then, using the agent-based approach, a multi-agent-based system is constructed to integrate die-maker's activities into customer product development process within a distributed, collaborative and concurrent environment. The overall architecture incorporates three agent communities: Part design agent, diemaker involvement agent, and coordination agent. The content of each agent is described in detail. Each agent community has a facilitator which provides an intermediary between a local collection of sub-agents and remote agents through two main services: routing outgoing messages to the appropriate destinations and translating incoming messages for consumption. Finally, the system implementation is provided. A KQML/XML communication and data exchange method between agents is proposed. A case study is presented to illustrate how the die-maker is involved and cooperates with the Part designer to make an optimal Part design.

Mehmet Firat - One of the best experts on this subject based on the ideXlab platform.

  • computer aided analysis and design of sheet metal forming processes Part iii Stamping die face design
    Materials & Design, 2007
    Co-Authors: Mehmet Firat
    Abstract:

    The finite element simulations of a sheet metal forming process help the methods and tooling engineer designing the forming interface for a Stamping Part by shifting the costly press shop try-outs to the computer aided design environment. The finite element models used in the sheet metal formability and Stamping feasibility assessment studies are commonly based on the ideally rigid die-face design. This hypothesis is in general consistent with the present industrial experience even for large draw-dies of conventional steels. Nevertheless, it may not be practicable in the case of the forming high strength steels of moderate thickness because of the comparable higher press loads required to shape the blank. Consequently, an estimation of the die-face deformations during the forming process may be necessary during the evaluation of potential formability and springback problems and possible compensations should be considered in connection with the usual Stamping die design and construction routines before submitting to the production. In this Part of the study, an engineering methodology is presented for the structural assessment of the Stamping tooling and the die-face designs during the sheet metal forming processes. Using the computer aided analysis and design concepts given previously in Part I and in Part II of this study, the proposed approach is employed in the forming interface design of an automotive Stamping Part including the complete die construction. The results have indicated the relative merits of the die-face distortions on the formability and springback deformations.

  • Computer aided analysis and design of sheet metal forming processes: Part II – Deformation response modeling
    Materials & Design, 2007
    Co-Authors: Mehmet Firat
    Abstract:

    The continually decreasing lead-times for the design approval and the production of Stamping dies enforce the Stamping methods engineer to apply the finite element method more effectively in the industrial settings. The selection of a proper finite element plasticity model and the efficient utilization of the material formability data are main factors controlling the accuracy of the sheet metal deformation response prediction using a computer simulation code. Especially with the introduction of high strength sheet metals in to the Stamping processes the capabilities and limitations of a plasticity model used in finite element process simulations should be reevaluated in order to have an accurate assessment of the Part formability and springback deformations. In this Part of the study, following a review of the sheet metal deformation properties in conjunction with the initial yield loci and plastic anisotropy concepts, two rate-independent anisotropic plasticity models are employed in the deformation modeling of a Stamping Part. Their performances in the formability and springback analyses are demonstrated and comparisons are presented.

Liu Hongwu - One of the best experts on this subject based on the ideXlab platform.

  • Bending spring back analysis of U-shape Stamping Part based on JSATMP/NV
    Computer-Aided Engineering, 2012
    Co-Authors: Liu Hongwu
    Abstract:

    The main functions of JSTAMP/NV and YOSHIDA-UEMORI model(Y-U model) are introduced.Taking the examination question about effect of pre-strain on bending spring back of U-shape Stamping Part as an example,which is proposed on the international conference and workshop on numerical simulation of 3D sheet metal forming processes(Numisheet'2011),the application of JSTAMP/NV in bending and spring back simulation process with pre-strain and without pre-strain is introduced,the spring back simulation results are compared with the experiment results,and it shows that they are consistent quite well.At last,the new functions of new version 2.6 of JSTAMP/NV are briefly introduced.

Yu-feng Xia - One of the best experts on this subject based on the ideXlab platform.

  • A study on the multi-phase transformation kinetics of ultra-high-strength steel and application in thermal-mechanical-phase coupling simulation of hot Stamping process
    Materials Science and Engineering: A, 2016
    Co-Authors: Guo-zheng Quan, Zong-yang Zhan, Le Zhang, Gui-chang Luo, Yu-feng Xia
    Abstract:

    Abstract It is a significant issue to deeply understand the phase transformation kinetics and further predict the multi-phase compositions of hot Stamping Part with finite element method (FEM). As for BR1500HS ultra-high-strength steel, a time-temperature-transformation (TTT) test schedule from austenitizing temperature (1100 °C) to different transforming temperatures (380–750 °C) was conducted on Gleeble 3800 machine. On the basis of microstructure observations, ferrite+pearlite region (600–740 °C), bainite region (420–600 °C) and martensite region (lower than 420 °C) were distinguished. According to the acquired dilatometric curves, the starting and ending TTT curves were fitted. Subsequently, Johnson-Mehl-Avrami type kinetics equation and Magee's equation were respectively solved to describe the diffusional and non-diffusional transformation kinetics as follows: the diffusional transformation efficiency increases to a maximum value followed by a gradual decrease till 100% with time extending; the non-diffusional transformation degree gradually increases with decreasing temperature without time influence. Eventually, the multi-phase transformation kinetics were applied to the construction of the thermal-mechanical-phase dynamic coupling finite element (FE) model of hot Stamping process and analysis of the multi-phase evolution and distribution in a hot Stamping Part. Eventually, the hot Stamping process experiment was conducted and proved that the simulation results were effective.

Li Zhigang - One of the best experts on this subject based on the ideXlab platform.

  • Blank design and formability prediction of complicated progressive die Stamping Part using a multi-step unfolding method
    Journal of Materials Processing Technology, 2007
    Co-Authors: Zhang Zhi-bing, Du Ting, Li Zhigang
    Abstract:

    A multi-step unfolding method (MSUM) is developed for blank design and formability prediction of complicated progressive die Stamping Part. In the method, a finite element model of the inverse approach (IA) is developed at a local area according to the Stamping process, and the intermediate shape is unfolded on a reference surface at the local area. Not only the influence of the connection, blank-holder force and the friction, but also the influence of the offsetting of the strain neutral layer with different radius of curvature at local area, are considered in the model, which improves the calculation precision of the blank shape at each step. The key intermediate blank shapes and initial blank shape can be generated using the method with many times in an inverse sequence. The optimum blank shape also can be designed according to the formability of the forming Part. The MSUM is illustrated to the blank design of a progressive die Stamping Part, and a benchmark test is compared with experimental and other numerical results.

  • Design and optimization of the drawbead of panels based on FE analysis
    2005
    Co-Authors: Li Zhigang
    Abstract:

    Drawbead is used to control the flow of the material in sheet metal forming process.The equivalent model of drawbead has been discussed.The method,which integrates the UG software and FASTAMP,a software developed by our laboratory and used for simulating the forming process of a Stamping Part,to determine the optimized parameters of the drawbead has been presented.The creation has been validated through the simulation of a drawing Part.