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Introduction to Statistical Quality Control

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Introduction to Statistical Quality Control – PowerPoint PPT presentation

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Title: Introduction to Statistical Quality Control


1
Introduction to Statistical Quality Control
  • ?????? ?????????

2
Learning Objective
  • ????????????????????????? quality and quality
    improvement
  • ???????????????????? quality ????????????? ???
  • ??????????????????????????????????????????????????
    ???????????????????????????

3
???????????????/?????? ????????
  • ?????????????????????????????????????
  • ???????????????????????????
  • ??????????????????
  • P Productivity
  • Q Quality
  • C Cost
  • D Delivery
  • S Safety
  • M Method, Management
  • E Environment

4
Definitions and Meaning of Quality
  • ?????????????????????????? quality ???
    ??????????????????? ????????????????????? ???
    product ???? service ???????
  • Quality ??????????????????????????????????????????
    ???? consumer ????????????? product ???? service
  • Quality ??????????????????????????????????????????
    ????????????????????????????

5
Definitions and Meaning of Quality
  • ?????????????????????????????????????????????
    ???? ???????????????????????
    ?????????????????????????? ???
    ???????????????????????????? ???????
  • ??????????????????????????????????? ??? ???????
    ??? ?????????????
  • ???????????? ???????????????????????????????
    ????????????? ????????????????????? ???????????
  • ????????????????????????????????????, ??,
    ????????????????????, ??????? ????????????????????
    ???? ???????

6
??????????????????????????????????????????????????
???
  • Consumer ???????????????????????????????????,
    ?????? ?????????????? ??????????????????????????
  • ??????????? ??????? ?????????????????????
  • ???????????? ??????? ?????????????????????????????
    ???

7
1-1 Definitions and Meaning of Quality
  • 1-1.1 The Eight Dimensions of Quality
  • Performance
  • (will the product do the intended job?)
  • Reliability
  • (how often does the product fail?)
  • Durability
  • (how long does the product last?)
  • Serviceability
  • (how easy is it to repair the product?)

8
1-1 Definitions and Meaning of Quality
  • 1-1.1 The Eight Dimensions of Quality
  • Aesthetics
  • (what does the product look like?)
  • Features
  • (what does the product do?)
  • Perceived Quality
  • (what is the reputation of the company or its
    product?)
  • Conformance to Standards
  • (is the product made exactly as the designer
    intended?)

9
  • This is a traditional definition
  • ??????????????????????????????????????????????????
    ?????????????????????? ?????????? 2 ?????? ???
  • Quality of design
  • Quality of conformance

10
Definitions and Meaning of Quality
  • Quality of design
  • Products ??????????????????????????? size
  • ????????????????? Product, ??????????????????????
    Product ????????????? (??????????)appearance ???
    performance
  • ????????????????????????????????????materials
    ???????????????????????????? Product.

11
Definitions and Meaning of Quality
  • Quality of conformance
  • ??????? ????????????????? product
    ??????????????????????????????? design
    ?????????????
  • Factor ????? ???????????????????????????????????
    Quality
  • ???????????????? manufacturing processes

12
Definitions and Meaning of Quality
  • ?????????????????? Quality of design ??? Quality
    of conformance
  • ???? ?????????????????????????????????????????????
    ???????????????????????????????
    ?????????????????????????????????????????????
    ??????????????????????????????????????????????????
    ??????? ???????
  • ??????????????????????????????????????????????????
    ??????????????????????????????????????

13
?????????????????????????????????????
  • ??????????????????????????????????????????????????
    ????????????
  • ??????????????????????????????????????????????????
    ? ??????????????????? (Control Charts)
  • ?????????????? ??????????????????????
    ???????????????????????????????????????????????
    ??????????????????????????????????????????????????
    ????????????

14
?????????????????????????????????????
  • ??????????????????????????????????????????????????
    ????????????????????????????????????????
  • ??????????????????????????????????????????????????
    ???????????????? ?????????????????????????????????
    ??????????????????????????????????????
  • ??????????????????????????????????????????????????
    ??????????????????????????

15
This is a modern definition of quality
  • ?????????????? Quality ????????
    ??????????????????????????????????????????????????
    ??? variability ???????????????
  • If variability characteristics of a product
    decreases, quality of product increases.

16
The Transmission Example
  • How did the Japanese do this?
  • It leads to the following definition of quality
    improvement

17
  • The transmission example ???????????????????????
    ?????????? Quality improvement
  • ?????????????? quality improvement ???
    elimination of waste.

18
Quality Engineering Terminology
  • Parameter ?????????? ?????????????????????????????
    ???????? consumer ??????????? critical-to-quality
    ?????????????
  • Physical length, weight, voltage, viscosity
  • Sensory taste, appearance, color
  • Time Orientation reliability, durability,
    serviceability

19
Quality Engineering Terminology
  • Quality Engineering
  • Set ???????????????????, ?????????????????????????
    ????????? ????????????????????????????????????????
    product ??????????????????????
  • ?????????????????? product ??????????? match
    ?????????? customer ??????? ??? variability
  • ?????????????????? variability ??? material,
    performance, operator ?????????????
    ????????????????????????????? quality improvement

20
Quality Engineering Terminology
  • ????????????? statistical method
    ????????????????????????????? ????????? data
    ???????????????????????? ??? 2 ?????
  • Attributes data (????????????????) ????????????
    Countable Data ??? ???????????????????????????????
    ????????????????????????? ???????? ????
    ?????????????? ??????????????
  • Variable data (????????????????)????????????
    Measurable Data ???? length, voltage, or
    viscosity

21
Terminology
  • ?????????????????? ?????????????????????????
    Specifications(?????????????)
  • ??????????????? product ???? specification
    ????????? component, subassembly ???? final
    product
  • ???????????????????????????????????????????????
    nominal or target value ??????????????????????????
    ??????????????
  • ??????????? ?????????????????? product
    ????????????? target value ???? product
    ?????????????????????????????? ????
    ?????????????? product

22
Terminology
  • ??????????? specification limit
  • Lower specification limit
  • Upper specification limit
  • Nonconforming product ????????????????????????????
    ?????? material, process ???? part ????? ???????
    ???????????? component ???? product
    ?????????????????????
  • Nonconforming ??????? fail ??????? specification
    ??? product

23
Terminology
  • Nonconforming ????????????????????????????????????
    ??????????????????
  • Nonconforming ???????????????????? Defect product
    ??? defect ?????????????????????????????????
    ????????????????????????????? product
    ????????????????

24
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25
Statistical Methods
  • Statistical process control (SPC)
  • Control charts, plus other problem-solving tools
  • Useful in monitoring processes, reducing
    variability through elimination of assignable
    causes
  • On-line technique
  • Designed experiments (DOX)
  • Discovering the key factors that influence
    process performance
  • Process optimization
  • Off-line technique
  • Acceptance Sampling

26
Statistical Methods
27
Statistical Methods
28
Statistical Methods
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