Title: Introduction to Statistical Quality Control
1Introduction to Statistical Quality Control
2Learning Objective
- ????????????????????????? quality and quality
improvement - ???????????????????? quality ????????????? ???
- ??????????????????????????????????????????????????
???????????????????????????
3???????????????/?????? ????????
- ?????????????????????????????????????
- ???????????????????????????
- ??????????????????
- P Productivity
- Q Quality
- C Cost
- D Delivery
- S Safety
- M Method, Management
- E Environment
4Definitions and Meaning of Quality
- ?????????????????????????? quality ???
??????????????????? ????????????????????? ???
product ???? service ??????? - Quality ??????????????????????????????????????????
???? consumer ????????????? product ???? service - Quality ??????????????????????????????????????????
????????????????????????????
5Definitions and Meaning of Quality
- ?????????????????????????????????????????????
???? ???????????????????????
?????????????????????????? ???
???????????????????????????? ??????? - ??????????????????????????????????? ??? ???????
??? ????????????? - ???????????? ???????????????????????????????
????????????? ????????????????????? ??????????? - ????????????????????????????????????, ??,
????????????????????, ??????? ????????????????????
???? ???????
6??????????????????????????????????????????????????
???
- Consumer ???????????????????????????????????,
?????? ?????????????? ?????????????????????????? - ??????????? ??????? ?????????????????????
- ???????????? ??????? ?????????????????????????????
???
71-1 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?)
81-1 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
10Definitions and Meaning of Quality
- Quality of design
- Products ??????????????????????????? size
- ????????????????? Product, ??????????????????????
Product ????????????? (??????????)appearance ???
performance - ????????????????????????????????????materials
???????????????????????????? Product.
11Definitions and Meaning of Quality
- Quality of conformance
- ??????? ????????????????? product
??????????????????????????????? design
????????????? - Factor ????? ???????????????????????????????????
Quality - ???????????????? manufacturing processes
12Definitions and Meaning of Quality
- ?????????????????? Quality of design ??? Quality
of conformance - ???? ?????????????????????????????????????????????
???????????????????????????????
?????????????????????????????????????????????
??????????????????????????????????????????????????
??????? ??????? - ??????????????????????????????????????????????????
??????????????????????????????????????
13?????????????????????????????????????
- ??????????????????????????????????????????????????
???????????? - ??????????????????????????????????????????????????
? ??????????????????? (Control Charts) - ?????????????? ??????????????????????
???????????????????????????????????????????????
??????????????????????????????????????????????????
????????????
14?????????????????????????????????????
- ??????????????????????????????????????????????????
???????????????????????????????????????? - ??????????????????????????????????????????????????
???????????????? ?????????????????????????????????
?????????????????????????????????????? - ??????????????????????????????????????????????????
??????????????????????????
15This is a modern definition of quality
- ?????????????? Quality ????????
??????????????????????????????????????????????????
??? variability ??????????????? - If variability characteristics of a product
decreases, quality of product increases.
16The 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.
18Quality Engineering Terminology
- Parameter ?????????? ?????????????????????????????
???????? consumer ??????????? critical-to-quality
????????????? - Physical length, weight, voltage, viscosity
- Sensory taste, appearance, color
- Time Orientation reliability, durability,
serviceability
19Quality Engineering Terminology
- Quality Engineering
- Set ???????????????????, ?????????????????????????
????????? ????????????????????????????????????????
product ?????????????????????? - ?????????????????? product ??????????? match
?????????? customer ??????? ??? variability - ?????????????????? variability ??? material,
performance, operator ?????????????
????????????????????????????? quality improvement
20Quality Engineering Terminology
- ????????????? statistical method
????????????????????????????? ????????? data
???????????????????????? ??? 2 ????? - Attributes data (????????????????) ????????????
Countable Data ??? ???????????????????????????????
????????????????????????? ???????? ????
?????????????? ?????????????? - Variable data (????????????????)????????????
Measurable Data ???? length, voltage, or
viscosity
21Terminology
- ?????????????????? ?????????????????????????
Specifications(?????????????) - ??????????????? product ???? specification
????????? component, subassembly ???? final
product - ???????????????????????????????????????????????
nominal or target value ??????????????????????????
?????????????? - ??????????? ?????????????????? product
????????????? target value ???? product
?????????????????????????????? ????
?????????????? product
22Terminology
- ??????????? specification limit
- Lower specification limit
- Upper specification limit
- Nonconforming product ????????????????????????????
?????? material, process ???? part ????? ???????
???????????? component ???? product
????????????????????? - Nonconforming ??????? fail ??????? specification
??? product
23Terminology
- Nonconforming ????????????????????????????????????
?????????????????? - Nonconforming ???????????????????? Defect product
??? defect ?????????????????????????????????
????????????????????????????? product
????????????????
24(No Transcript)
25Statistical 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
26Statistical Methods
27Statistical Methods
28Statistical Methods