29-05-2013, 12:46 PM
Introduction to Computer Aided Process Planning
Computer Aided.ppt (Size: 153 KB / Downloads: 46)
Computer Integrated Manufacturing (CIM)
Computer Aided Design (CAD)
2D
3D
Concurrent Engineering
Computer Aided Process Planning (CAPP)
Variant
Generative
Computer Aided Manufacturing (CAM)
CNC
Robotics
Material Handling
Just in Time (JIT)
Group Technology
Flexible Manufacturing Systems
What is process planning?
Recipe/Algorithm/Step-by-step instructions
Fast Food Chain
Same taste everywhere from NY to LA
How do they do it?
Customization in formal dinner restaurant
Manufacturing Environment
Role of the master machinist in small batch manufacturing
Manufacturing is more complex than cooking yet the planning for it is similar
Job shop: group machines which perform same operation together
Routing of parts through the various departments
Process plan defines the route
Reduction in the necessary skill of operator can be achieved by using a detailed process plan
Components of Process Planning
Selection of machining operations
Sequencing of machining operations
Selection of cutting tools
Determining the setup requirements
Calculation of cutting parameters
Tool path planning and generation of NC/CNC programs
Design of Jigs/Fixtures
Process Planning in different environments
In tool-room type manufacturing
“make part as per drawing” is sufficient
In metal-forming type operations
The process planning requirements are embedded directly into the die.
Process planning is fairly trivial
Job-shop type manufacturing requires most detailed process planning
Design of tools, jigs, fixtures and manufacturing sequence are dictated directly by the process plan.
Requirements for process planner
Must be able to analyze and understand part requirements
Have extensive knowledge of machine tools, cutting tools and their capabilities
Understand the interactions between the part, manufacturing, quality and cost
Automatic Process Planning
“ generate a complete process plan directly from a CAD drawing”
Requires:
Automated CAD interface
Take a general CAD model ( 3D for unambiguous data) and develop an interface to develop a manufacturing interface for this model : Feature Recognition of CAD
Design the parts with available manufacturing features : Feature based CAD
Dual: useful features of both approaches
Intelligent (computer based) process planner