SPC过程能力培训教材(English)
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Process Capability (Cp / Cpk / Pp / Ppk)
Global Training Material
Creator Function Approver Document ID Version / Status Location : Global Mechanics Process Manager : Mechanics : Jukka Mehtonen / Global Process Team : DMT00018-EN : V.2.0 / Approved : Notes : \\…\ NMP \ DOCMANR4 \ PCP \ PC Process Library DocMan
Change History : Issue Date
1.0 2.0 21st Dec’01 17th Jun’05
Handled By
Comments
Jim Christy & Søren Lundsfryd Approved for Global Use Yrjo Saastamoinen Approved for Global Use
NOTE – All comments and improvements should be addressed to the creator of this document.
1 © NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential
Contents
Section 1 2 3 4 5 6 7 Heading / Description Page Variation, Tolerances and Dimensional Control 4 Population, Sample and Normal Distribution 15 Cp and Cpk Concept 28 Confidence Interval 37 Process Capability Analysis 47 Mini Cpk Cpk Data Collection Spreadsheet DMM00024 60
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© NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential
Tool Verification Process
Measurement System Analysis
• Calibration • Variable Gauge R&R •DMY00019, DMT00017, DMM00210
Tool Approval – at Tool Maker / Supplier
• FAI (DMY00019, DMT00014, DMM00061) • Precontrol: Set-up Rules
5 Min Variation Short Term
Machine Approval – process capability
• 3-10hr Run • Process Capability: Cpk, Ppk •DMY00019, DMT00018, DMM00024
10 Hr Variation Long Term
Process Performance
• Ongoing production • Process Stability • Process Capability: Cpk, Ppk
3 © NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
6 Mo Variation Performance
Company Confidential
Process Capability - Evaluating Manufacturing Variation
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© NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential
Section 1 Variation, Tolerances and Dimensional Control
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© NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential
Two Types of Product Characteristics
Variable: A characteristic measured in physical units, e.g. millimetres, volts, amps, decibel and seconds. ly s on le ariab v with deal e i ng w in s tra i In t h Attribute: A characteristic that by comparison to some standard is judged “good” or “bad”, e.g. free from scratches (visual quality).
ON
OFF
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© NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential
The Sources of Process/System Variation
Equipment Methods
Environment Process
Customer Satisfaction
Operators
Material
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© NOKIA 2005 T0001802.PPT/ 17-Jun-2005 / Yrjo Saastamoinen
Company Confidential