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Unit Manufacturing Processes Issues and Opportunities in Research (1995) / Chapter Skim
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10 Simulation and Modeling
Pages 127-134

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From page 127...
... In many process development and design situations, simulations are beginning to replace full-scale process trials, reducing development time and cost compared with those of the normal iterative methods. Tooling and dies and material specifications can also be optimized based on the results developed from the preliminary design and geometric modeling stages (NRC, in press)
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From page 128...
... For example, the robustness of deformation process models is influenced by contact modeling capabilities. Current generalized three-dimensional contact algorithms include general three-dimensional sliding capability, automatic detection of element contact and release, contact between deformable bodies, and single surface contact capability for modeling the formation of defects such as lap formation.
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From page 129...
... Application of simulation tools to the design of unit processes (e.g., tooling configuration, input material characteristics, and process parameter operational scheme) is an increasingly important element in successful product manufacture.
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From page 130...
... selection of suitable unit processes; optimum sequencing of the unit processes; preliminary estimation of the unit process operational parameters; and preliminary tooling design for each unit process.
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From page 131...
... And Prepare Drawings Install Dies Select Machine Parameters Start Fonning Process it/ Expert ~ \< system J / Finite- a\ _ Element Model _ ~ Programs for / \Each Process/ Database With Die/Matenal Properties Figure 10-1 Schematic illustration of steps involved in manufacturing discrete parts via a unit manufacturing process (adapted from Altan and Oh, 1987~. The importance of a robust geometric modeler and reliable transfer of threedimensional geometry as a part of the integrated modeling system cannot be overemphasized in light of some ofthe difficulties in three-dimensional modeling
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From page 132...
... The geometric modeler should also provide accurate information concerning assembly details, such as interference between different parts and tools. Current geometric modeling tools utilize advanced solid modeling techniques for creation of part and tool geometries and include automatic mesh generation.
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From page 133...
... Promising directions include streamlining ofthe partial differential equations and the use of revised variables that incorporate physically coupled behavior. · Specialized computer processors.
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From page 134...
... From Volume 16 of the Proceedings of the North American Manufacturing Research Conference held 24-27 May 1988. Urbana, Illinois: University of Illinois.
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Key Terms

  • unit processes
  • process simulations
  • geometric modeler
  • boundary conditions
  • process design

  • preliminary design
  • partial differential
  • process modeling
  • interface phenomena
  • deformation process

  • finite element
  • geometric modeling
  • process simulation
  • contact algorithms
  • mesh generation

  • differential equations
  • automatic mesh
  • strain deformations
  • analysis packages
  • revised variables

  • heat transfer
  • modeling capabilities
  • process geometry
  • design situations
  • solution algorithms

  • material behavior
  • tool geometries
  • workpiece behavior
  • parameter operational
  • algorithms include


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