Transcript SPC Montgomery ch07.ppt

Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
1
Learning Objectives
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
2
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
3
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
4
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
5
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
6
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
7
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
8
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
9
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
10
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
11
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
12
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
13
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
14
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
15
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
16
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
17
Design of the Fraction Nonconforming Chart
•
Three parameters must be specified
1. The sample size
2. The frequency of sampling
3. The width of the control limits
•
•
Chapter 7
Common to base chart on 100% inspection
of all process output over time
Rational subgroups may also play role in
determining sampling frequency
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
18
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
19
• The np Control chart – based on the number
nonconforming
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
20
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
21
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
22
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
23
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
24
Average sample size approach
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
25
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
26
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
27
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
28
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
29
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
30
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
31
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
32
Average run lengths (ARLs)
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
33
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
34
7.3 Control Charts for Nonconformities (Defects)
A nonconforming unit does not satisfy one or more of the specifications
Each point where a specification is not satisfied is a defect or
nonconformity
Nonconforming units contain at least one nonconformity
However, units with defects are not necessarily nonconforming
It is often useful to work directly with the number of defects
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
35
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
36
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
37
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
38
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
39
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
40
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
41
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
42
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
43
Cause and Effect Diagram
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
44
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
45
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
46
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
47
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
48
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
49
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
50
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
51
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
52
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
53
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
54
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
55
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
56
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
57
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
58
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
59
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
60
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
61
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
62
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
63
Low Defect Levels
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
64
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
65
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
66
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
67
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
68
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
69
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
70
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
71
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
72
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
73
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
74
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
75
Actions taken to improve a process
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
76
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
77
Chapter 7
Introduction to Statistical Quality Control, 7th Edition by Douglas C. Montgomery.
Copyright (c) 2012 John Wiley & Sons, Inc.
78