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Hem > Utställning > Innehåll
Kvalitet och kontroll
Mar 21, 2018

Fyra huvudkategorier av kvalitetsbristkostnader beskrivs följande:

1, förebyggande---kostnader för planering, genomförande och upprätthålla kvalitetssystem som garanterar överensstämmelse med kvalitetskrav på ekonomiska nivåer. Ett exempel på förebyggande kostnaden är utbildning i användning av Statistisk processtyrning.

2, bedömning---kostnader för att fastställa graden av överensstämmelse med krav på kvalitet. Ett exempel på bedömning kostnaden är inspektion.

3, inre fel---kostnader som uppstår när produkter, komponenter och material misslyckas med att uppfylla kvalitet krav före att överföra äganderätten till kunden. Ett exempel på inre fel kostnaden är skrot.

4, externa fel---kostnader när produkter inte uppfyller kvalitetskraven efter ägarbyte till kunden. Ett exempel på externa misslyckande kostnaden är garantianspråk.

Även om nivån på kvalitetskontroll bestäms till stor del av Sannolikhetsteori och statistiska beräkningar, är det mycket viktigt att de data collection processer som dessa förfaranden är beroende av att lämpligt och korrekt. Den bästa statistikproceduren är värdelösa om utfodras felaktig data, och liksom bearbetningsprocesser, inspektion datainsamling är själv en process med praktiska gränserna för noggrannhet, precision, upplösning och repeterbarhet.

Alla inspektion och/eller mätning processer kan definieras i termer av sin noggrannhet och repeterbarhet, precis som en tillverkningsprocess utvärderas för noggrannhet och repeatablity. Kontrollerade experiment kan utföras och statistiska mått på resultaten kan göras att bestämma utförandet av en metod för inspektion i förhållande till delarna som skall inspekteras. Lämpligheten av en eller annan metod kan bedömas på grundval av standardavvikelser och konfidensnivåer som gäller för varje metod som används i en viss inspektion situation.     (slutet)

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