Chapter 5 Control Charts for Variables - PowerPoint PPT Presentation

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Chapter 5 Control Charts for Variables

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Title: Chapter 5 Control Charts for Variables


1
Chapter 5Control Charts for Variables
  • ?????? ?????????

2
Learning objective
  • ???????????????????????????????????????????????
    Control charts ???? Variable
  • ???????????? Control charts ???? Variable ???
  • ??????????????????? ??? ??? R chart ???
  • ??????????????? process capability
    ?????????????????????????????????? control chart
    ???
  • ??????????????????? ??? ??? s chart ???
  • ??????????????????? ??? MR chart ???

3
Introduction
  • ????????????????????????????????? numerical
    measurement ???????? ??? diameter ??? bearing ,
    ???????, ?????????, ????????, ??????? ???????????
    variable
  • ????????????????????????????????????????????????
    ??? ????????????????????????????
  • ??????????????????????????????????? ??? control
    chart ??????????? x bar chart
  • ???????????????????????????????????? ??? control
    chart ??????????? R chart ???? s chart
  • ????????? ??? ??????????????????????
    ????????????????????? ??????????????????????

4
Introduction
5
Control chart for x bar and R chart
6
Control chart for x bar and R chart
  • ???????????? ????? 5-1 ?????????????
    upper ??? lower control limit ???????????????
    3
  • ???????????????????????????? ???
    ??????????????????? ????????????????????????
    ?????????????
  • ???????????????????????????? ????????
    ????????????????????????????????????????? ????
    Subgroups ????????????????????? 20 ??? 25
    ?????????????
  • m ??? ??????????????????????????????
  • n ??? ????? observation (?????????)
    ????????????????????? ????????? n ????????????
    ?????? 4, 5 ,6
  • ?????????????????????????????????????????? ()
    ???????????????????????????????? (x)

7
Subgroup Data with Unknown ? and ?
8
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9
Application of and R Charts
  • ????? 5-4 ???????? 5-5 ????????? trial control
    limits
  • ??????????? m ?????????????????????????? samples
    ?????????
  • ????????? 20-25 subgroups ??????? n ??????????? 3
    ??? 5
  • ?????????????? out-of-control ????????????????
    trial control limits ??????????????????????????

10
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12
Application of and R Charts
  • ??????????? out-of-control ?????????????????
    assignable causes
  • ??? assignable causes ?????????????
    ???????????????????????????????????? ??? revise
    ?????? trial control limits
  • ???????????????????????????????????? plot in
    control
  • ???????????????? trial control limits
    ??????????????????????????

13
Application of and R Charts
  • ??? assignable cause ?????????????????????????????
    ???????? ???????????????????????
    ????????????????? 2 ????
  • ???????????? ????? ?????????????????????
    assignable cause ??? revise limits
  • ?????????????? ???????????????????????????????????
    ? control chart
  • ?????????? ??????? out-of-control
    ?????????????????????????????????????????????????
    patterns ??????? ?????????????????????????????????
    ????????????? process problems

14
Revise control limit
15
Revise control limit
16
???????????? process capability
  • x bar ??? R chart ????????????????????????????????
    ?????????????????????? ??? ? and ?
  • x bar ??? R chart ??????????????????? performance
    of process(???????????????????) ??? capability
    process
  • ?????????????????????????????????? nonconforming
    ???????????????????????????

17
???????????? process capability
  • ?????? lower and upper natural tolerance limit
  • UNTL ? 3?
  • LNTL ? - 3?

18
?????????????????? Sample Size ?? Chart

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