Computer-aided process planning (CAPP)

201 Pages·2013·8.45 MB·English

by  Pirzada, Sohail

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ABSTRACT
Title: COMPUTER-AIDED PROCESS PLANNING
(CAPP) - SORICH
Author: SOHAIL PIRZADA
Degree: Master of Science
Date: December, 1991
Advisor: Steve Kotefski
Department: Manufacturing Engineering
The last two decades have witnessed the increasing role of
the computer in the process planning function. This has been
further enhanced by the advent of the knowledge based expert
system, and its impact on Computer Aided Process Planning
(CAPP). CAPP has emerged as a strategic link between design
and manufacture. This thesis discusses the various methods
used in the process planning function. Group Technology (GT)
plays a pivotal role in establishing CAPP. The utilization
of Artificial Intelligence techniques in CAPP is listed.
This study also presents an Interactive Software adaptive to
product/part configuration variables.
COMPUTER-AIDED PROCESS PLANNING
(CAPP)
SORICH
by
SOHAIL PIRZADA
Thesis Submitted To The Faculty Of Graduate Division Of The
New Jersey Institute of Technology
In Partial Fulfillment Of The Requirement For The Degree Of
Master Of Science
Manufacturing Engineering
December, 1991
APPROVAL SHEET
Title of The Thesis: COMPUTER-AIDED PROCESS PLANNING
(CAPP) - SORICH
Name of The Candidate: SOHAIL PIRZADA
Thesis and Abstract Approved Date Approved
Ze Kotdeski /
' f/
Professor
Department of Manufacturing
Engineering Technology
Dr. Raj Sodhi
Professor
Department of Manufacturing
Engineering
Nouri Levy
Professor
Department of Mechanical
Engineering
VITA SHEET
Name: SOHAIL PIRZADA
Degree & Date: Master of Science, December, 1991
Education:
Institute Degree Major Date
NED University of B.E (B.S) Mechanical 1989
Engineering &
Technology, Karachi,
Sindh - Pakistan
New Jersey Institute M. S Manufacturing 1991
of Technology,
New Jersey
To
my
MOTHER
Nasim Akhtar Pirzada
ACKNOWLEDGEMENT
The author wishes to express his sincere gratitude to
Professor Steve Kotefski of Manufacturing Engineering
Technology Department at New Jersey Institute Of Technology
for his assistance, guidance and encouragement as Graduate
Advisor.
CONTENTS
CHAPTER 1
Computer Aided Process Planning (CAPP) 2
CHAPTER 2
Process Planning Methods 5
2.1. Engineering Design 13
2.2. Dimensioning 16
2.3. Tolerances 18
2.4. Geometric Tolerances 24
2.5. Maximum Material Condition (MMC) 28
2.6. Regardless of Feature Size (RFS) 29
2.7. Least Material Condition (LMC) 29
2.8. Datum 30
2.9. Basic 30
2.10. Machine Tooling 31
2.11. Jigs 32
2.12. Fixtures 34
2.13. Dies 35
CHAPTER 3
Economical Production Criteria 38
3.1. Automation 39
3.1.1. Types of automation 40
CHAPTER 4
Manual Process Planning 46
CHAPTER 5
Computer-Aided Process Planning 52
5.1. Benefits of CAPP 56
5.2. Retrieval CAPP systems 57
5.2.1. The Preparatory Stage 60
5.2.2. A Production Stage 62
5.2.3. Database Structure 63
5.2.4. Search Procedure 64
5.2.5. Plan Editing and Parameter
Selection 65
5.3. Generative CAPP systems 67
5.3.1. Forward and Backward Planning 72
5.3.2. The Input Format 75
a. Code 77
b. Description Language 77
c. CAD Models 81
5.3.3. Decision Logic 82
5.3.3.1. Decision Trees 86
5.3.3.2 Decision Tables 95
5.4. BORICH CAPP System Designed for Thesis 96
CHAPTER 6
Group Technology in CAPP 99
6.1. Part-Family Formation 103