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1、,ProcessCapability(Cp/Cpk/Pp/Ppk) GlobalTrainingMaterial,Creator:GlobalMechanicsProcessManager Function:Mechanics Approver:GaryBradley/GlobalProcessTeam DocumentID:DMT00018-EN Version/Status:V.1.0/Approved Location:Notes:NMPDOCMANR4PCPPCProcessLibraryDocMan ChangeHistory: IssueDateHandledByComments
2、1.021stDec01JimChristy&SrenLundsfrydApprovedforGlobalUse NOTEAllcommentsandimprovementsshouldbeaddressedtothecreatorofthisdocument.,Contents,Section Heading / Description Page 1 Variation, Tolerances and Dimensional Control 4 2 Population, Sample and Normal Distribution 15 3 Cp and Cpk Concept 28 4
3、Use of the NMP Data Collection Spreadsheet 44 5 Confidence of Cpk 52,Process Capability - Evaluating Manufacturing Variation,Acknowledgements Benny Matthiassen (NMP CMT, Copenhagen, Denmark) Frank Adler (NMP Alliance, Dallas, USA) Joni Laakso (NMP R&D, Salo, Finland) Jim Christy (NMP SRC, Southwood,
4、 UK),Section 1 Variation, Tolerances and Dimensional Control,Two Types of Product Characteristics,Variable: A characteristic measured in physical units, e.g. millimetres, volts, amps, decibel and seconds.,In this training we deal with variables only,Process Capability (Cp / Cpk / Pp / Ppk) Global Tr
5、aining Material,Creator : Global Mechanics Process Manager Function : Mechanics Approver : Gary Bradley / Global Process Team Document ID : DMT00018-EN Version / Status : V.1.0 / Approved Location : Notes : NMP DOCMANR4 PCP PC Process Library DocMan Change History : Issue Date Handled By Comments 1.
6、0 21st Dec01 Jim Christy & Sren Lundsfryd Approved for Global Use NOTE All comments and improvements should be addressed to the creator of this document.,Contents,Section Heading / Description Page 1 Variation, Tolerances and Dimensional Control 4 2 Population, Sample and Normal Distribution 15 3 Cp
7、 and Cpk Concept 28 4 Use of the NMP Data Collection Spreadsheet 44 5 Confidence of Cpk 52,Process Capability - Evaluating Manufacturing Variation,Acknowledgements Benny Matthiassen (NMP CMT, Copenhagen, Denmark) Frank Adler (NMP Alliance, Dallas, USA) Joni Laakso (NMP R&D, Salo, Finland) Jim Christ
8、y (NMP SRC, Southwood, UK),Section 1 Variation, Tolerances and Dimensional Control,Two Types of Product Characteristics,Variable: A characteristic measured in physical units, e.g. millimetres, volts, amps, decibel and seconds.,In this training we deal with variables only,The Sources of Process/Syste
9、m Variation,Process,Two Types of Processes,All processes have: Natural (random) variability = due to common causes,Stable Process: A process in which variation in outcomes arises only from common causes,Unstable Process: A process in which variation is a result of both common and special causes,Unna
10、tural variability = due to special causes,Shewhart (1931),The Two Causes of Variation,Common Causes: Causes that are implemented in the process due to the design of the process, and affect all outcomes of the process Identifying these types of causes requires methods such as Design of Experiment (DO
11、E), etc. Special Causes: Causes that are not present in the process all the time and do not affect all outcomes, but arise because of specific circumstances Special causes can be identified using Statistical Process Control (SPC),Defect,USL,LSL,nominal value,Tolerances,LSL (lower specification limit) 10,7,USL (upper specification limit) 10,9,Acceptable part,Rejected Part,Rejected Product,Nominal 10,80,1,Rejected Part,A tolerance is a allowed maximum variation of a dimension.,Measurement Report,In most cases we measure only one part per cavity for measurement report,
