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Computer Aided Process Planning (CAPP)

Comparison of Variant and Generative Process planning methods and their pros and cons

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Computer Aided Process
Planning
Presented By-
Pratik Patel 111213049
Mayank Chidri 111213015
Atul Gosavi 111213023
Pratik Gandhi 111213021
Contents
 Introduction
 About Computer Aided Process
Planning
 General steps involved
 Variant Computer Aided Process
Planning
 Generative Computer Aided Process
Planning
 Review
 Advantages & Disadvantages
Introduction
Product design
Process planning
Operation programming
Verification
Scheduling
Execution
Process,
machine
knowledge
Scheduling
knowledge
Introduction
 Process planning - Translation of design
information into the process steps and
instructions to efficient and effective
Manufacturing.
 As new age manufacturing processes
are evolving, Computer Aided Process
Planning (CAPP) helps in simplifying and
efficiently carrying out the conventional
process planning and optimizing use of
resources.
 Detailed set of instructions, engineering
drawings, specifications, parts and
CAPP
 Development of process plan (route
sheet) using following approaches-
Variant Computer Aided Process Planning
Generative Computer Aided Process
Planning
 E.g. Design changes- changes cost
estimates
 Machine breakdown- alternate solution
effective solution
 Interaction among various functions of
an organization and dynamic changes.
General steps involved
 Design input, Material selection,
Process selection, Process
sequencing, Machine and tool
selection, Intermediate surface
determination, Fixture selection,
Machining parameter selection,
Cost/time estimation, Plan
preparation, Mc tape image
generation these are the general steps
involved in the computer aided
process planning.
Ad

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Computer Aided Process Planning (CAPP)

  • 1. Computer Aided Process Planning Presented By- Pratik Patel 111213049 Mayank Chidri 111213015 Atul Gosavi 111213023 Pratik Gandhi 111213021
  • 2. Contents  Introduction  About Computer Aided Process Planning  General steps involved  Variant Computer Aided Process Planning  Generative Computer Aided Process Planning  Review  Advantages & Disadvantages
  • 3. Introduction Product design Process planning Operation programming Verification Scheduling Execution Process, machine knowledge Scheduling knowledge
  • 4. Introduction  Process planning - Translation of design information into the process steps and instructions to efficient and effective Manufacturing.  As new age manufacturing processes are evolving, Computer Aided Process Planning (CAPP) helps in simplifying and efficiently carrying out the conventional process planning and optimizing use of resources.  Detailed set of instructions, engineering drawings, specifications, parts and
  • 5. CAPP  Development of process plan (route sheet) using following approaches- Variant Computer Aided Process Planning Generative Computer Aided Process Planning  E.g. Design changes- changes cost estimates  Machine breakdown- alternate solution effective solution  Interaction among various functions of an organization and dynamic changes.
  • 6. General steps involved  Design input, Material selection, Process selection, Process sequencing, Machine and tool selection, Intermediate surface determination, Fixture selection, Machining parameter selection, Cost/time estimation, Plan preparation, Mc tape image generation these are the general steps involved in the computer aided process planning.
  • 7. Variant Computer Aided Process Planning  Also known as data retrieval method.  Process plan for a new part is generated by recalling, identifying and retrieving an existing plan for a similar part and making necessary modifications for new part known as ‘Master Part’  Coding and classification schemes of group technology (GT) used, number of algorithms, mathematical models are developed for family part formation and plan retrieval.  Using existing system can save a tremendous amount of time and manpower.
  • 8. Block Diagram for Variant CAPP
  • 9. Detailed steps involved  Form the Part Families by Grouping Parts- classifying parts and formation of group parts  Develop Standard Process Plans- developed for each part families based on common part features.  Retrieve and Modify the Standard Plans for New Parts- when new part enters the systems, it is designed and coded based on its feature, using the coding and classification scheme, and then assigned to a part family.
  • 10. Advantages of Variant Computer Aided Process Planning  Processing and evaluation of complicated activities and managerial issues done in an efficient manner, thus reduction of time and labor requirement.  Reduced development and hardware cost and shorter development time.
  • 11. Disadvantages of Variant Computer Aided Process Planning  Difficult to maintain consistency during editing.  Proper accommodation of various combinations of attributes such as material, geometry, size, precision, quality, alternate processing sequence and machine loading among many other factors are difficult.  The quality of the final process plan largely depends on the knowledge and experience of process planner
  • 12. Generative Computer Aided Process Planning  In generative process planning, process plans are generated by means of decision logic, formulas, technology algorithms, etc.  Main aim is to convert a part form raw material to finished state.  Input to the system includes the description of the part in the form of part code number. .
  • 13. Generative Computer Aided Process Planning Generative process plan mainly consists of two major components : (i) Geometry based coding scheme. (ii) Knowledge Based
  • 14. Block Diagram for Generative CAPP
  • 15. Geometry-based Coding Scheme:-  All the geometric features for all process such as related surfaces, feature dimension, locations, on the features are defined by geometry based coding scheme.  The level of detail is much greater in generative system than a variant system Knowledge Based:- Process knowledge in the form of decision logic and data are used for matching of part geometry requirement with the manufacturing capabilities.
  • 16. Advantages of Generative Process Plan  They rely less on group technology code numbers since the process, usually uses decision tree to categorize parts into families.  Maintenance and updating of stored process plans are largely unnecessary.  New Components can planned as easy as existing components
  • 18. Advantages  It can systematically produce accurate and consistent process plans.  It leads to the reduction of cost and lead times of process plan.  Skill requirement of process planer are reduced to develop feasible process plan.  Interfacing of software for cost, manufacturing lead time estimation, and work standards can easily be done.  Leads to the increased productivity of process planar.
  • 19. Disadvantages  While compared with manual process planning the CAPP systems have few disadvantages:  The inability to show special manufacturing techniques.  The initial cost of establishing a CAPP system is high while compared with manual process planning.