03836SPC Chapter 1Statistical Process Control

1、the management and control of quality, 5e, 2002 south-western/thomson learningtmstatistical process control1the management and control of quality, 5e, 2002 south-western/thomson learningtma methodology for monitoring a process to identify special causes of variation and signal the need to take corre

2、ctive action when appropriatespc relies on control charts2the management and control of quality, 5e, 2002 south-western/thomson learningtm3common causesspecial causesthe management and control of quality, 5e, 2002 south-western/thomson learningtm4histograms do not take into account changes over time

3、.control charts can tell us when a process changesthe management and control of quality, 5e, 2002 south-western/thomson learningtmestablish state of statistical controlmonitor a process and signal when it goes out of controldetermine process capability5the management and control of quality, 5e, 2002

4、 south-western/thomson learningtm6controlcapability capablenot capable in control out of controlidealthe management and control of quality, 5e, 2002 south-western/thomson learningtmvariables datax-bar and r-chartsx-bar and s-chartscharts for individuals (x-charts)attribute datafor “defectives” (p-ch

5、art, np-chart)for “defects” (c-chart, u-chart)7the management and control of quality, 5e, 2002 south-western/thomson learningtm1.preparechoose measurementdetermine how to collect data, sample size, and frequency of samplingset up an initial control chart2.collect datarecord datacalculate appropriate

6、 statisticsplot statistics on chart8the management and control of quality, 5e, 2002 south-western/thomson learningtm9the management and control of quality, 5e, 2002 south-western/thomson learningtm3.determine trial control limitscenter line (process average)compute ucl, lcl4.analyze and interpret re

7、sultsdetermine if in controleliminate out-of-control pointsrecompute control limits as necessary10the management and control of quality, 5e, 2002 south-western/thomson learningtm11the management and control of quality, 5e, 2002 south-western/thomson learningtm12the management and control of quality,

8、 5e, 2002 south-western/thomson learningtm13the management and control of quality, 5e, 2002 south-western/thomson learningtm14the management and control of quality, 5e, 2002 south-western/thomson learningtmpoint outside control limitssudden shift in process averagecyclestrendshugging the center line

9、hugging the control limitsinstability15the management and control of quality, 5e, 2002 south-western/thomson learningtm16the management and control of quality, 5e, 2002 south-western/thomson learningtm17the management and control of quality, 5e, 2002 south-western/thomson learningtm18the management

10、and control of quality, 5e, 2002 south-western/thomson learningtm19the management and control of quality, 5e, 2002 south-western/thomson learningtm5.use as a problem-solving toolcontinue to collect and plot datatake corrective action when necessary6.compute process capabilitysurement system20the man

11、agement and control of quality, 5e, 2002 south-western/thomson learningtm21the management and control of quality, 5e, 2002 south-western/thomson learningtm22the management and control of quality, 5e, 2002 south-western/thomson learningtm23the management and control of quality, 5e, 2002 south-western

12、/thomson learningtm24x-bar and s chartsx-chart for individualsthe management and control of quality, 5e, 2002 south-western/thomson learningtm25the management and control of quality, 5e, 2002 south-western/thomson learningtm26the management and control of quality, 5e, 2002 south-western/thomson lear

13、ningtm27the management and control of quality, 5e, 2002 south-western/thomson learningtm28the management and control of quality, 5e, 2002 south-western/thomson learningtm29fraction nonconforming (p-chart)fixed sample sizevariable sample sizenp-chart for number nonconformingcharts for defectsc-chartu

14、-chartthe management and control of quality, 5e, 2002 south-western/thomson learningtm30the management and control of quality, 5e, 2002 south-western/thomson learningtm31the management and control of quality, 5e, 2002 south-western/thomson learningtm32the management and control of quality, 5e, 2002

15、south-western/thomson learningtm33the management and control of quality, 5e, 2002 south-western/thomson learningtm34the management and control of quality, 5e, 2002 south-western/thomson learningtm35the management and control of quality, 5e, 2002 south-western/thomson learningtm36the management and c

16、ontrol of quality, 5e, 2002 south-western/thomson learningtm37the management and control of quality, 5e, 2002 south-western/thomson learningtm38the management and control of quality, 5e, 2002 south-western/thomson learningtm39the management and control of quality, 5e, 2002 south-western/thomson lear

17、ningtm40quality characteristicvariableattributen1?n=10 or computer?x and mrnoyesx and sx and rnoyesdefectivedefectconstant sample size?p-chart withvariable samplesizenop ornpyesconstantsampling unit? c uyesnothe management and control of quality, 5e, 2002 south-western/thomson learningtm41basis for samplingsample sizefrequency of samplinglocation of control limitsthe management and control of quality, 5e, 2002 south-western/thomson learningtm42the management and control of quality, 5e, 2002 south-western/t