This document provides an overview of Computer Aided Process Planning (CAPP). It discusses the general steps in CAPP, including design input, material selection, and cost estimation. It describes two main approaches to CAPP: variant CAPP, which retrieves and modifies existing process plans; and generative CAPP, which generates new plans using decision logic and algorithms. The advantages of CAPP are reducing time/costs and increasing consistency and productivity. The disadvantages include difficulty maintaining consistency and accounting for all manufacturing factors in variant CAPP, and high initial costs compared to manual planning.
What is process planning .Difficulties in traditional process planning,CAPP Model,Types of CAPP ,1.Retrieval type CAPP (variant) systems.
2.Generative CAPP systems.
3.Hybrid CAPP systems.
Process planning system , Machinability data systems , Benefits of CAPP
What is process planning .Difficulties in traditional process planning,CAPP Model,Types of CAPP ,1.Retrieval type CAPP (variant) systems.
2.Generative CAPP systems.
3.Hybrid CAPP systems.
Process planning system , Machinability data systems , Benefits of CAPP
COMPUTER AIDED PROCESS PLANNING (CAPP)KRUNAL RAVAL
Computer-aided process planning (CAPP) helps determine the processing steps required to make a part after CAP has been used to define what is to be made. CAPP programs develop a process plan or route sheet by following either a variant or a generative approach.
GT Definition,Implementing Group Technology (GT),four methods GT, 1.OPTIZ PARTS CLASSIFICATION AND CODING SYSTEM,2.MICLASS coding system ,CODE MDSI System,BENEFITS OF GROUP TECHNOLOGY and limitations.
The adaptive control is basically a feedback system that treats the CNC as an internal unit and in which the machining variables automatically adapt themselves to the actual conditions of the machining process.
Introduction, Conventional and Revised with CAD/CAM Product cycle, Application of computers to the design process, comparison of capabilities of designers and computers, Reasons for implementing CAD, Benefits of CAD, CAD workstation,
COMPUTER AIDED PROCESS PLANNING (CAPP)KRUNAL RAVAL
Computer-aided process planning (CAPP) helps determine the processing steps required to make a part after CAP has been used to define what is to be made. CAPP programs develop a process plan or route sheet by following either a variant or a generative approach.
GT Definition,Implementing Group Technology (GT),four methods GT, 1.OPTIZ PARTS CLASSIFICATION AND CODING SYSTEM,2.MICLASS coding system ,CODE MDSI System,BENEFITS OF GROUP TECHNOLOGY and limitations.
The adaptive control is basically a feedback system that treats the CNC as an internal unit and in which the machining variables automatically adapt themselves to the actual conditions of the machining process.
Introduction, Conventional and Revised with CAD/CAM Product cycle, Application of computers to the design process, comparison of capabilities of designers and computers, Reasons for implementing CAD, Benefits of CAD, CAD workstation,
Laser assisted machining is a recent topic and has drastically reduced cutting forces and tool wear.
The presentation covers intro, setup, comparison of two processes and discussion about advantages and disadvantages of using this technique.
Computer Aided Process Planning (CAPP): concepts; traditional and CAPP; automated
process planning: process planning, general methodology of group technology, code
structures of variant and generative process planning methods, AI in process planning,
process planning software.
Flexible Manufacturing Systems (FMS): Introduction, types, concepts, need and
advantages of FMS - cellular and FMS - JIT and GT applied to FMS.
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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.
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
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.