{财务管理内部控制}诺基亚企业内部控制之制造能力控制英文版
55页1、Process Capability (Cp / Cpk / Pp / Ppk)Global Training 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 : IssueDateHandled ByComments 1.021st Dec01Jim Christy & Sren LundsfrydApproved for Global Use NOTE All comments and improvements should be addressed to the creator of this document.,Con
2、tents,SectionHeading / DescriptionPage 1Variation, Tolerances and Dimensional Control4 2Population, Sample and Normal Distribution15 3Cp and Cpk Concept28 4Use of the NMP Data Collection Spreadsheet44 5Confidence of Cpk52,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, UK),Section 1 Variation, Tolerances and Dimensiona
3、l 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/System Variation,Methods,Operators,Customer Satisfaction,Material,Environment,Equipment,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,U
4、nstable Process: A process in which variation is a result of both common and special causes,Unnatural 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 (DOE), etc. Special Causes: Causes that are not present in the process all the time and do not affect all o
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