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Computer Aided Process Planning System Based On STEP

Zare Noghabi, Azin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44419 (01)
  4. University: Sharif University of Technology
  5. Department: Indusrial Engineering
  6. Advisor(s): Houshmand, Mahmoud
  7. Abstract:
  8. Process Planning is the link between CAD and CAM and is one of the most complex issues in product development chain. In addition, this process is time-consuming, costly and requires expert man power. In recent decades, many Computer Aided Process Planning (CAPP) systems are developed to reduce the duration of Process Planning and many feature based process planning systems have been reported. Feature recognition and determining the precedence of machining features are the most critical issues in feature-based process planning. It gets more complicated where geometric interaction occurs between machining features. This work, focuses on feature recognition and their geometric interactions and the impact of interactions on determining the machining precedence .An algorithm is developed that considers the precedence of machining features based on Hard and Soft Precedence Constraints that are defined to ensure the feasibility of machining operations and high quality of the final product, respectively. STEP – STandard for Exchange of Product model data – is used for representing data models. The AP203 and AP224 STEP application Protocols are used to extract features and geometry. The developed software tool processes geometry based on AP224 part model, which represents all the geometric and topological product data. It extracts features and their geometrical data and uses the algorithm to recognize the interactions. Based on the type of interactions the program generates the precedence of machining operations that can be used as an input for downstream applications like generating STEP-NC files.
  9. Keywords:
  10. Character ; Computer Aided Process Planning ; Process Planning ; Feature Recognition ; Feature Interaction ; Standard for Exchange of Product Data (STEP)

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