CAD/CAM Concepts MECHANICAL THEORY

What is the Structure and Advantages of Generative Computer Aided Process Planning(GCAPP)?

A system which automatically synthesizes a process plan for a new component is called Generative computer aided process planning.It synthesizes the process information to create a process plan for a new part automatically without human intervention.This post mainly focus on what is the Structure and Advantages of Generative Computer Aided Process Planning(GCAPP) in a detailed manner.
 
What is the Structure & Advantages of Generative Computer Aided Process Planning(GCAPP)
What is the Structure & Advantages of Generative Computer Aided Process Planning(GCAPP)

Characteristics of Generative Computer Aided Process Planning(GCAPP):

  • No existing standard plans
  • Able to generate process plans for both new and existing parts
  • Process plans are generated by means of
           Decision logic
           Formulas
           Technology algorithms
           Geometry based data
           Geometry-based coding scheme
           Process knowledge in the form of decision logic and data
                       to perform uniquely the main decisions for converting a part from raw materials to a finished state.
 

Requirement of Generative Process Planning:

Part description
–Part to be produced must be clearly and precisely defined in a computer compatible format (OPITZ,AUTAP)
•Manufacturing databases
                Logic of manufacturing must be identified and captured
               The captured logic must be incorporated in a unified manufacturing database
Decision making logic and algorithms
               Decision trees
Expert Systems: AI based approaches

Decision Tables in Generative CAPP:

  • A decision table program structuring tool provides readable documentation as a automatic by product
  • A decision table is portioned into conditions and actions
  • Can be used with pre-processor to eliminate some program coding to provide automatic checks for completeness,contradiction and redundancy.
 
What is the Structure & Advantages of Generative Computer Aided Process Planning(GCAPP)
What is the Structure & Advantages of Generative Computer Aided Process Planning(GCAPP)
 
Techniques for generative CAPP:
  • Identify the machinable volume and attach necessary technological details relevant for mfg.
  • Do a preliminary sorting of a pockets in order of levels that clearly indicate the likely sequence in the final process plan
  • Examine the pocket for any possibility of combining so that the machining operations could be reduced
  • Select the machine tools that can be used for the each of the identified pockets
  • Identify the process sequence required for the machining of the pocket based on the technological requirements
  • For each of the pocket and the operation decided,select the cutting tool required.
  • Sort the operations on the basis of the machine tools and cutting tools .Sequence the operations on the basis of the machine tools and cutting tools by making use of heuristic rules
  • Evaluate the machining time and idle time and select the final process plan based on the lowest cost and machining time
  • Present the final results in the suitable form.

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