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Integrated Process Planning System for Prismatic Parts Based on STEP

Foroozmand, Hamzeh | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41937 (01)
  4. University: Sharif University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Houshmand, Mahmoud
  7. Abstract:
  8. Nowadays, as a result of rapid changes of market, it is necessary to reduce the period between design and manufacturing of a new product. Among them, process planning is one of the most difficult elements of production chain and also, there are a few numbers of experts in this field. In addition, this process is time-consuming and costly. So, it is important for companies to reduce the period of new product’s presentation by reduction of process planning duration. On the other hand, it is proved that the lowest level of integration in CIM systems is in CAPP section. Integration provides sharing data in the system, so the other parts of production systems can exchange product information and modify it in early stages of production. One of the important points in integrating process is how to formulate it. Feature based design and manufacturing techniques is the best method of doing this task. Besides, it can be said, the main task in process planning is feature recognition. This research proposes an integrated process planning system that can do automatically the feature recognition function. Another point in integrating is the representation pattern. In this work the STEP – STandard for Exchange of Product model data – is used for representing data models. Application Protocols AP203, AP224 and AP238 of the STEP standard are mostly used to provide CAD/CAPP/CAM integration. Development of an integrated process planning system for prismatic parts based on STEP standard is the goal of this work. To achieve this goal, following activities have been done: (1) developing a geometric information interpreter which has the capability of reading, processing and exporting STEP AP203 files. (2) developing a feature recognizer for prismatic parts to extract manufacturing features from geometric models based on STEP, and translating output data into STEP AP224 format. (3) mapping machining information to recognized features, which makes it possible to generate process plans by using CAPP systems for prismatic parts in natural STEP-NC format. In conclusion it can be said that the proposed system shows not only is integration possible, but also this integration reduce the period between design and manufacturing. And consequently it cuts the production costs. Also, the program output is a suitable input for downstream applications like CNC code generators and STEP-NC
  9. Keywords:
  10. Integration ; Process Planning ; Feature Recognition ; Computer Aided Design (CAD) ; Computer Aided Manufacturing (CAM) ; Standard for Exchange of Product Data (STEP) ; Computer Aided Process Planning

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