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Samenvatting Kwaliteitsbeheersing - 17/20 eerste zit

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Dit document is een samenvatting voor het vak Kwaliteitsbeheersing van de KU Leuven voor 3e bachelor Handelsingenieur (in de beleidsinformatica) HIR(B), Toegepaste Economische Wetenschappen (TEW). Het bevat alle leerstof die behandeld werd in de les, een overzicht van de belangrijkste termen, en een Q&A op het einde van de samenvatting met de belangrijkste concepten voor het examen.

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Kwaliteitsbeheersing
Samenvatting




Vakcode: B-KUL-D0H64a

Prof. Matuschke Jannik



Handelsingenieur (HIR)
Handelsingenieur in de Beleidsinformatica (HIRB)
Toegepaste Economische Wetenschappen (TEW)

KU Leuven



Academiejaar 2024-2025




1

, Inhoudstafel
Hoofdstuk 1: Introductie........................................................................................................................9
1.1 Juran: Geschiktheid voor gebruik.................................................................................................9
Kwaliteit van design.......................................................................................................................9
Kwaliteit van conformiteit.............................................................................................................9
1.2 Garvin: Acht kwaliteitsdimensies...............................................................................................10
1.3 Feigenbaum: De klant centraal..................................................................................................10
1.4 Geschiedenis van de kwaliteit....................................................................................................11
1.5 Kosten van kwaliteit...................................................................................................................12
1.5.1 Conformiteitskosten (produceren van kwaliteit)................................................................12
1.5.2 Niet-conformiteitskosten (gebrek aan kwaliteit)................................................................12
1.5.3 Optimaal kwaliteitsniveau (OQL)........................................................................................12
1.5.4 Wanneer wel, wanneer niet naar 100%?............................................................................13
1.6 Conclusie....................................................................................................................................13
Hoofdstuk 2: Meetsystemen...............................................................................................................14
2.1 Metrologie.................................................................................................................................14
2.2 Meetschalen..............................................................................................................................14
2.3 Aandachtspunten bij meetsystemen.........................................................................................15
2.3.1 Operator en instructies.......................................................................................................15
2.3.2 Instrumenten en kalibratie.................................................................................................15
2.4 Variatie en meetfouten..............................................................................................................15
2.5 Accuratesse en precisie..............................................................................................................15
2.5.1 Accuratesse.........................................................................................................................15
2.5.2 Precisie (herhaalbaarheid, consistentie).............................................................................16
2.5.3 De vier combinaties (dartbord-analogie)............................................................................16
2.6 Herhaalbaarheid en reproduceerbaarheid................................................................................16
2.7 R&R-analyse: Volledige uitwerking............................................................................................16
2.7.1 Voorbereiding en uitvoering...............................................................................................16
2.7.2 Stap 1: Gemiddelde per operator.......................................................................................17
2.7.3 Stap 2: Bereik (range) per combinatie.................................................................................17
2.7.4 Stap 3: Controlegrens..........................................................................................................17
2.7.5 Stap 4: Objectgemiddelden.................................................................................................18



2

, 2.7.6 Stap 5: Variatiecomponenten berekenen...........................................................................18
2.7.7 Stap 6: Part Variation en Total Variation.............................................................................19
2.7.8 Stap 7: Evaluatie..................................................................................................................19
2.7.9 Belang voor procesbeheersing vs. inspectie.......................................................................20
2.8 Conclusie....................................................................................................................................20
Hoofdstuk 3: Steekproefinspectie........................................................................................................21
3.1 Situatie.......................................................................................................................................21
3.2 Drie opties: 100%, 0%, of steekproef.........................................................................................21
3.2.1 100% inspectie....................................................................................................................21
3.2.2 0% inspectie........................................................................................................................21
3.2.3 Steekproefinspectie............................................................................................................21
3.3 Steekproefmethoden: Hoe nemen we een steekproef?............................................................22
3.3.1 Aselecte (lukrake) steekproef.............................................................................................22
3.3.2 Systematische steekproef...................................................................................................22
3.3.3 Gestratificeerde steekproef................................................................................................22
3.3.4 Clustersteekproef................................................................................................................22
3.4 Fouten bij steekproeven............................................................................................................23
3.4.1 Systematische fouten..........................................................................................................23
3.4.2 Steekproeffouten................................................................................................................23
3.5 Steekproefplannen....................................................................................................................23
3.5.1 Variabelen vs. attributen.....................................................................................................23
3.5.2 Enkelvoudig steekproefplan (attributen)............................................................................24
3.5.3 Dubbel steekproefplan (attributen)....................................................................................24
3.5.4 Meervoudig steekproefplan................................................................................................24
3.5.5 Sequentieel steekproefplan................................................................................................24
3.5.6 Welk plan gebruiken?.........................................................................................................24
3.6 De OC-curve (Operating Characteristic).....................................................................................25
3.6.1 AQL, RQL, α en β.................................................................................................................25
3.6.2 De ideale OC-curve.............................................................................................................25
3.6.3 OC-curve en steekproefgrootte..........................................................................................25
3.6.4 OC-curve berekenen: enkelvoudig plan..............................................................................25
3.6.5 OC-curve berekenen: dubbel plan......................................................................................26
3.6.6 Enkelvoudig vs. dubbel: hoeveel inspecties?......................................................................27
3.7 Steekproefplannen voor variabelen...........................................................................................28



3

, 3.7.1 Enkelvoudig plan voor variabelen.......................................................................................28
3.7.2 Keuze van n en c.................................................................................................................28
3.8 Conclusie....................................................................................................................................29
Hoofdstuk 4: Procesbeheersing...........................................................................................................30
4.1 Variabiliteit zit overal.................................................................................................................30
4.1.1 Twee soorten variabiliteit...................................................................................................30
4.1.2 Procesgedrag herkennen (A, B, C, D)..................................................................................30
4.2 Procesbeheersing vs. procesgeschiktheid..................................................................................31
4.3 Waarom steekproeven en niet individuele metingen?..............................................................31
4.4 Regelkaarten: het werkpaard.....................................................................................................32
4.4.1 Soorten regelkaarten..........................................................................................................32
4.5 X̅-R-regelkaarten........................................................................................................................32
4.5.1 Schatting van μ en σ............................................................................................................32
4.5.2 X̅-kaart regelgrenzen...........................................................................................................32
4.5.3 R-kaart regelgrenzen...........................................................................................................32
4.5.4 Waarom 3σ-grenzen?.........................................................................................................32
4.6 OC-curve van een X̅-kaart..........................................................................................................33
4.7 Interpretatietests.......................................................................................................................34
4.7.1 Tests voor X̅- én R-kaart......................................................................................................34
4.7.2 Tests alleen voor X̅-kaart (gebaseerd op zones)..................................................................34
4.8 X̅-S-regelkaarten........................................................................................................................34
4.9 Regelkaarten met n = 1..............................................................................................................34
4.9.1 X-MR-kaart (voortschrijdend bereik)..................................................................................34
4.9.2 EWMA-kaart........................................................................................................................35
4.10 Regelkaarten toepassen: stap voor stap..................................................................................36
4.10.1 Voorbereidende beslissingen............................................................................................36
4.10.2 Rationele steekproeven....................................................................................................36
4.10.3 Steekproeffouten..............................................................................................................36
4.10.4 Regelkaarten opstellen en gebruiken................................................................................36
4.11 Uitgewerkt voorbeeld: Volvo Trucks Gent...............................................................................37
4.12 Procesgeschiktheid..................................................................................................................37
4.12.1 Percentage conforme producten......................................................................................37
4.12.2 Geschiktheidsindex Cp......................................................................................................37
4.12.3 Geschiktheidsindex Cpk....................................................................................................38



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