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COQ--質(zhì)量成本分析

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1、,COST OF UALITY,品 質(zhì) 成 本,Q,Poor Quality,Poor Business!,品質(zhì)差,生意差!,It is a time bomb waiting to,Explode!,COQ高,是一顆等待爆炸的定時(shí)炸彈!,IF COQ high,如果,COQ,高,Why?,Hidden failure cost,隱藏的失效本錢,Commonly measured,failure cost,通常量度的失效本錢,True,Failure,Costs,真正的失效本錢,Scrap,報(bào)廢,Rework,翻工,Warranty,保證,Engineering time,工程設(shè)計(jì)時(shí)間,Man

2、agement time,管理時(shí)間,Shop and field downtime,工場(chǎng)壞機(jī)時(shí)間,Increased inventory,增加存貨,Decreased capacity,削弱生產(chǎn)能力,Delivery problems,交貨問(wèn)題,Lost orders,訂單減損,Commonly measured failure cost is only the tip of the True Failure Costs.,通常量度的失效本錢只是真正失效本錢中的冰山一角。,Quality cost is a measure of the achievement and non achievem

3、ent of product quality.,Tip of the Ice Berg,冰山一角,Why?,The Cost Pyramid 本錢金字塔,Process Control,工藝控制,Inspection,檢 查,Field Service,服 務(wù),Design,設(shè)計(jì),Cost of Quality,QFD,SPC,DOE,Why?,Money spend to fix,an issue at different,stages:,不同階段修正某個(gè)問(wèn),題所花的金錢:,Design:1$,設(shè)計(jì):1$,Production:100$,生產(chǎn),:100$,Customer:1000$,到客戶

4、手中,:1000$,Resultant Cost 結(jié)果本錢 =Failure Cost 失效本錢,Defect Cost 次品本錢.,Controllable Cost 可控本錢=Prevention and Appraisal Cost.預(yù)防和評(píng)估本錢.,Poor Quality is Poor Business,品質(zhì)差即是生意差,0,10,20,30,40,50,60,Controllable Effort,Cost,Total Cost,總本錢,Controllable,Cost可控本錢,Resultant Cost,結(jié)果本錢,A,Low,High,Why?,Effect of Good

5、 Preventive Activities,良好的預(yù)防活動(dòng)產(chǎn)生的效果,0,10,20,30,40,50,60,Controllable Effort,Cost,A,B,Old Total,舊的總本錢,Controllable,Cost,可控本錢,Resultant Cost,結(jié)果本錢,Low,High,New Tota,新的總本錢,l,Good Preventive activities usually begin at front end of process,with better effect on resultant cost.,良好的預(yù)防活動(dòng)通常開(kāi)始于工序前沿,對(duì)結(jié)果本錢產(chǎn)生較好的

6、影響。,Why?,Taguchi Quality Loss Function(QLF),Taguchi,品質(zhì)損失運(yùn)算(,QLF),We cannot reduce cost without affecting quality.我們不能削減本錢而不影響品質(zhì),We can improve quality without increasing cost.我們可以不增加本錢而改善品質(zhì).,We can reduce cost by improving quality.我們可以通過(guò)改善品質(zhì)而降低本錢.,We can reduce cost by reducing variations.我們可以通過(guò)減少差異

7、而降低本錢.,Taguchi QLF strive for minimal variation around target values without adding cost.,He defines loss as“the lost imparted to society from the time the product is shipped,this loss includes,Taguchi QLF 努力達(dá)致接近目標(biāo)值的最小差異而不增加本錢。,他將損失定為:“從產(chǎn)品裝運(yùn)時(shí)流失的那局部損失“這種損失包括:,customer dissatisfaction,客戶不滿意,added warr

8、anty cost to the producer,生產(chǎn)商增加擔(dān)保本錢,loss due the companys bad reputation,公司信譽(yù)惡劣引致的損失,which would lead to eventual loss of market share.,這種損失終將導(dǎo)致市場(chǎng)份額的喪失。,Why?,Taguchi Quality Loss Function(QLF),Taguchi,品質(zhì),損失運(yùn)算,(,QLF),Quality cost are usually quantified in terms of tangible cost such as rework and scr

9、ap cost,and customer warranty.These losses constitute only the tip of the iceberg.,品質(zhì)本錢通常以有形本錢如翻工,報(bào)廢,給客戶提供擔(dān)保等等而被量化,這些損失只是冰山一角。,What about the intangible costs such as management/engineering time,inventory,customer,dissatisfaction,and loss market share?,那些無(wú)形的本錢代價(jià)如管理/設(shè)計(jì)時(shí)間,存貨,客戶的失望,市場(chǎng)份額損失等,又怎樣呢?,QLF is

10、 a method used to approximate these hidden and long term losses.QLF 是用于估算這些隱藏的而且是長(zhǎng)期損失的方法。,Why?,Taguchi Quality Loss Function(QLF),Taguchi,品質(zhì)損失,運(yùn),算,(,QLF),The way QLF is established depends on the type of quality characteristics involved.A quality characteristics is whatever we measure to judge perfo

11、rmance(quality).,QLF的建立有賴于有關(guān)的品質(zhì)特性。,品質(zhì)特性是用來(lái)判斷性能(品質(zhì))而進(jìn)行的一切量度。,There are five types of quality characteristics.,有五種品質(zhì)特性.,Nominal the best.Achieving a desired target value with minimal variations,such as,dimensions&output voltage.,名義上的最好 達(dá)致理想的目標(biāo)值,差異最小,如尺寸和輸出電壓。,Smaller the better.Minimizing a response,s

12、uch as shrinkage and wear.,越小越好 如收縮和磨損,Larger the better.Maximizing a response,such as pull off force and tensile strength.,越大越好 如拉力和張力,Attribute.Classifying and/or counting data,such as appearance.,屬性澄清并且/或者清點(diǎn)數(shù)據(jù),如外觀,Dynamic.Response varies depending on input,such as a fan drive speed,should vary wi

13、th engine temperature.,動(dòng)態(tài) 回復(fù)有賴於輸入,如風(fēng)扇的變速必須根據(jù)引擎溫度而變化。,Why?,Taguchi Quality Loss Function(QLF),Taguchi,品質(zhì),損失運(yùn)算,(,QLF,Value of quality characteristics,品質(zhì),特性值,Loss$,y,L=k(y-T),L =Loss in$s以美元計(jì)的損失,k =Cost coefficient 本錢系數(shù),y =Value of quality characteristics 品質(zhì)特性值,T =Target value.目標(biāo)值,LSL,USL,Why?,Basic Pr

14、emises for Quality Cost:,品質(zhì)本錢根本前提:,1.It is less expensive to prevent rather than detect nonconformity,預(yù)防比檢測(cè)更省錢。,2.Process and product performance can be appraised(measured),工序和產(chǎn)品性能可以評(píng)估(量度),3.The causes for nonconformance can be identified and their effects can be reduced or eliminated,產(chǎn)品不符的原因可以確認(rèn),其影

15、響可以減小或消除,Why?,Why Examine the Cost of Quality?,為何要審視品質(zhì)本錢?,1.Get management attention引起管理層的關(guān)注,2.Change the way employee think about errors,改變雇員看待錯(cuò)誤的方法,3.Provide better return on the quality improvement program,提供更好的回報(bào),4.Provide a tool to measure impact of corrective actions,為改正行動(dòng)提供量度的工具,5.Provide a t

16、ool to measure the impact of poor-quality on profits,為惡劣品質(zhì)對(duì)利潤(rùn)的影響提供量度的工具,Why?,Prevention,Scrap,預(yù),防,報(bào),廢,1.Prevention Cost預(yù)防本錢,-Cost of all activities specifically designed to prevent poor quality in products.,專門設(shè)計(jì)用于防止產(chǎn)品惡劣品質(zhì)的一切活動(dòng)本錢。,2.Appraisal Costs.評(píng)估本錢,-Cost associated with measuring,evaluating or auditing products to ensure,conformance to quality standards.,為確保符合品質(zhì)標(biāo)準(zhǔn)所進(jìn)行的與產(chǎn)品量度、評(píng)估或?qū)徍说扔嘘P(guān)的本錢。,3.Internal Failure Costs.內(nèi)部失效本錢,-Failure costs occurring prior to delivery or shipment of the product.,在產(chǎn)品交

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