!!!!!!!!!!!!!! Evaluation of Cost Associated with Variants Within a Product Family at Stoneridge Electronics Master of Science Thesis
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1 Evaluation of Cost Associated with Variants Within a Product Family at Stoneridge Electronics Master of Science Thesis JOHANNA LUNDQVIST JOHAN LÖFGREN Department of Product and Production Development Division of Production Systems CHALMERS UNIVERSITY OF TECHNOLOGY Gothenburg, Sweden, 2012
2 II EvaluationofCostAssociatedwithVariants WithinaProductFamilyatStoneridgeElectronics JOHANNALUNDQVIST JOHANLÖFGREN JOHANNALUNDQVIST,JOHANLÖFGREN,2012. DepartmentofProductandProductionDevelopment ChalmersUniversityofTechnology SEQ41296Göteborg Sweden Telephone+46(0)31Q Printedby ChalmersReproservice,Göteborg,Sweden 2012
3 Preface ThisreportisaresultofamasterthesisworkcarriedoutfromSeptember2011 until January 2012, covering 30 HEC. As part of the two master programs Production Engineering and Product development at the department Product andproductiondevelopment,chalmers. ThismasterthesisworkhasbeencarriedoutatStoneridgeElectronics,asapart of the project COMPLEX Support for Operation and ManQhour Planning in ComplexProduction. The%aim%of%COMPLEX%project%is%to%contribute%to%development% of% sustainable% production% systems% by% increased% understanding% of% the% concept% of% production%complexity,%providing%means%to%measure,%compare,%and%manage%added% complexity. (Per Gullander, Swerea IVF)% WewouldliketothankthepersonswehavebeenincontactwithatStoneridge Electronics, Ericsson and Scaniawhom have helped us during the project and havemadeitpossibleforustoreachourgoal. A special thanks is directed to our supervisors at Chalmers University of Technology and Stoneridge Electronics, Tommy Fässberg, Stefan Höög and ThomasAndersson. Göteborg2012Q02Q10 JohannaLundqvist JohanLöfgren III
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5 ListofAbbreviations Thefollowinglistiscompiledbyabbreviationsusedinthisreport. ABC, ActivityBasedCosting% HMT, ThruHoleMount% IC, ICT, InstrumentCluster InCircuitTest PCB, PrintedCircuitBoard PLM, ProductLifecycleManagement PROM,ProgrammableReadOnlyMemory SMD, SurfaceMountDevice SMED,SingleMinuteExchangeofDie TCO, TSU, Tachograph TachographSimulationUnit V
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7 Abstract StoneridgeElectronicsissubjecttoincreasedmass customization. In order to meet the demands from customers more product variety has been created. Functions creating differentiation for the customer is spread out on different variants in order to save material cost, this is what drives the variants at the Surface Mount Device, SMD level. Stoneridge Electronics is faced with new variants, which leads to a larger product variety early in their production. Variantsdrivecostsandcreateproblemsofaqualitativenature.Ahypothesisis thatby adding components, thusincreasing the cost of products but enabling reductionofthenumberofvariants,thevariantrelatedcostscouldbedecreased. Inordertoidentifycostsandqualitativeproblemsassociatedwiththevariants ofaspecificinstrumentclusterursulaicatthesmdlevel,apictureofhowthe present state at Stoneridge looks like have been established. Information have beengathered from interviews, observations and documents, thishavebeen conductedthroughouttheinternalvaluechain.themajorcostdriverdependent onthevariantsatthesmdstageforursulaicisthevariantsetqupinthesmd productionline. The development and industrialization of Ursula IC have been subject to costs dependent on the number of variants that could have been reduced if fewer variants had been present. Ideas for a future state have been developed, the results rely on cost data compiled in the present state, component costs, benchmarkingattwocompaniesactiveinareasofinterestandliteraturestudies. This resulted in two approaches, merging of variants at the SMD level and managing the variants. The merger of variants has the potential to reduce the impactofproblemsidentifiedinthestudy.managethevariants,requiresshorter variantsetquptimesandsupportingsystemforadministrationactivities. Today the number of variants of Ursula IC at the SMD stage is 11, given the current variant setqup times and other variant induced costs related to the materialcost,thenumberofvariantscouldbereducedto6. VII
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9 TableofContents 1 Introduction Background AimandObjectives Limitations Method FrameofReference EstimateCostImpactsofVariants VariantManagement MassCustomization Modularity PlatformManagement LeanProduction Productionplanningandcontrol MethodandMethodology ResearchApproach QualitativeandQuantitativeMethodology Interviews Benchmarking Calculations CalculationsPresentState CalculationsFutureState PresentState ProductDescription Development Industrialization Production Storage ToolandSetQupCentre SMD VariantSetQup HMTtoDispatch ProductionPlanning WIP RevisionChanges ScrapintheRepairloopattheSMDlevel ResultsfromProductionrelatedCalculations Aftermarket ConcludingRemarksonPresentState Benchmarking Ericsson Scania SuggestionsforaFutureState ReduceVariants ManageVariants Discussion...39 IX
10 7.1 MethodandMethodology PresentState FutureState Recommendations Conclusion Bibliography Appendices...49 X
11 ListofFigures Figure1SimplifiedvalueflowofUrsulaIC...1 Figure2Descriptionofprojectprocesses...3 Figure 3 Saw tooth Model, picture inspired by (Aronsson, Ekdahl, & Oskarsson, 2004)...11 Figure4variantsetQups...17 Figure5InstrumentCluster(Stoneridge-Electronics, 2011)...21 Figure6Factorylayout...26 Figure7ProcessflowforUrsulaICinÖrebro...27 Figure8Numberofvariantsleftfordifferentscenarios...38 ListofTables Table1Volumelevels...16 Table2RequiredreductionofsetQups...37 Table3Variantmergersfeasibility...37 XI
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13 1 Introduction Inthissectionthebackground,aimandobjectives,limitationsandanoverview ofthemethodsusedispresented. 1.1 Background Stoneridge Electronics is a supplier to the automotive industry and part of the Stoneridge Group, which manufactures electrical and electronic components, systems and modules for the automotive industry. Stoneridge Group has 6000 employeesandanannualturnoverof700milliondollars (Stoneridge Electronics AB). During 1996Q97 Stoneridge Group acquired Berifors, later named StoneridgeElectronics(Stoneridge Group). StoneridgeElectronicshas550employeesintotal,withtwoproductionplantsin ÖrebrorespectivelyTallinnandheadquarterinBromma.StoneridgeElectronics developsandmanufactureselectronicproductsfortheheavyautoindustrywith customers such as Daimler, MAN, Scania and Volvo trucks. The products are developed with a close contact to the customers with focus on the customers requirements and expectations. Such as instrument clusters and tachographs, StoneridgeElectronicsalsodevelopsandmanufacturesElectroniccontrolunits, power distribution centres, switches and telematics. Stoneridge s corporate philosophy is based on Lean and covers manufacturing, material suppliers and supportingfunctions.theproductionisautomatedtoahighdegreeandthereis afocusonzerofaults (Stoneridge Electronics AB). There is a new product family with the internal name Ursula IC, this is an instrument cluster that is produced at the plant in Örebro. It is the product family studied within this project through its planed and projected lifecycle.a newinstrumentclusterfamilytakesseveralyearstodevelop,andursulaictook approximately seven years. A simplified picture of the value flow from development to after market for Ursula IC is displayed in Figure 1 Simplified valueflow. Supply replacement units Outgoing material Final assembly Selective soldering and coating HMT SMD Pre setup Prom incoming material prepare for production Develope according to customers requirement specification Development Industrialization Production Aftermarket Figure1SimplifiedvalueflowofUrsulaIC 1
14 There is a trend towards mass customization, producing% goods% and% services% to% best%meet%individual%customer%needs%with%near%mass%production%efficiency %(Tseng & Jiao, 2001), on the automotive market in which Stoneridge Electronics is present.thereforestoneridgeelectronicsisfacedwithchallengesofincreasing demandforproductvariety. Ursula IC is subject to a higher degree of mass customization compared to Stoneridge s previous Instrument clusters. For the moment the product family UrsulaICconsistsof11variantsandmultiplevariantprototypesattheSMDlevel. Atfinalassemblyitisforthemoment22variantsthatisanticipatedtoincrease duringthelifecycletoasmuchas40.sinceursulaicatthesmdlevelhasmany variants, it creates several activities that drive costs. The other instrument clustersproducedbystoneridgeelectronicsdonothaveasmanyvariantsatthe SMDlevelasUrsulaIC.Thesevariantsdonotcreateanyadditionalvalueforthe customerscomparedtoifallfunctionalitycouldhavebeenimplementedwithina single PCB,PrintedCircuitBoard. The variants at final assembly are hard to eliminatesincethecustomersdemandthem,stillstoneridgecanaffectthepoint ofdifferentiationintheproduction. Theproductarchitectureneedstobeinvestigatedsinceitcreatesactivitiesthat drive costs along the whole product lifecycle. Different cost drivers that are associated to the number of variants atthesmdstagecanbeidentifiedfor productdevelopment,industrialization,productionandaftermarket. 1.2 AimandObjectives Thepurposeistoresearch,developandpresentsolutionsthatkeepcostsdown whileallowingroomformasscustomizationwithintheursulaicproductfamily. The goal is to develop suggestions for a future state that is more costqeffective thanthepresent,describinghowstoneridgecanhandlethecostsassociatedwith themanyvariantsinthesmdproductionline.inordertoachievethepurpose threeobjectivesisstated. Objectives I:Determinethepresentprojectedlifecyclecostsforproductvariantswithinthe productfamilyursulaic. Researchandanalysethepresent state of the product life cycle. Determine the costsassociatedwiththedifferentphasesofthelifecycleforursulaic. II: Create and introduce ideas for a future state coupled to the variants in the SMDline,whichcontributestokeepthelifecyclecostdownforUrsulaIC.Agiven hypothesistobeinvestigatediswhethermergersofvariantsarefeasible. Research and developsuggestions for a future state of the product life cycle, basedontheresultsfromthepresentstate. III:QDeterminehowtheideasforthefuturestatestandagainstthepresentstate andwhatrecommendationthatwillbegiventostoneridgeelectronics. Determinetheanticipatedcostreductionsassociatedwiththedifferentphasesof the lifecycle for Ursula IC. Analyse the future state and draw conclusions. 2
15 Determine if the future state in whole or in part is viable and sustainable for Stoneridgeelectronics. 1.3 Limitations Thestudyconcernsoneproductfamily,UrsulaIC.Thefocuswillbeonthecosts createdbythevariantsatthesmdlevel.alifecycleperspectivewillbeusedin order to address the costs associated within product development, Industrialization,productionandaftermarketoftheproductfamilyUrsulaIC. The study focuses on in house activities at the Stoneridge Electronics plant in Örebro, from incoming to outgoing goods. No alterations to the product architecturearemadeandthecostofimplementingchangestothevariantlineq up is not considered. The study spans 20 weeks. Due to secrecy few actual numberswillbepresentedinthereport. 1.4 Method Inordertoachievethethreeobjectivesseveralmethodshavebeenusedinorder to get quantitative and qualitative data. These methods are interviews, benchmarking, observations, literature study and data collection from different documentsprovidedfromstoneridge.thegeneralmethodologyoftheprojectis simplifiedanddisplayedbyfigure2descriptionofprojectprocesses,wherethe different project phases, problem overview, present state, future state and completionisassociatedwiththemethodsused.inthebeginningoftheproject, duringtheproblemoverview,anestablishmentoftheproblemwasmade.nexta description of present state was made with activities associated with the variantsofursulaicwithinthedifferentlifecyclephases.fromthepresentstate, suggestionsforthefuturestatewasmadeandfinallycompletionoftheproject. Figure2Descriptionofprojectprocesses 3
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17 2 FrameofReference Thissectionpresentsreviewsfromliteraturecoveringtopicsvitaltotheproject. 2.1 EstimateCostImpactsofVariants Therearedifferentapproachesthatcanbeusedtoassessthevarietycost.There are indirect and direct approaches to assess variety costs. Under the direct approach there are volume based, Activity Based Costing, ABC and Attribute Based Costing, ABCII. The indirect approach can provide managers with a hint that something is wrong but will not provide details. The volumeqbased approachwillspreadtheoverheadcostsevenlyoverallvariants.overheadcosts associated with products that are subject to mass customization are not that affectedbythevolumesmanufactured,butratheronthenumberofsetqups.the method ABC is developed to trace the cost associated to different products rather than costs due to product variants. This gives that ABC cannot be used solelytodeterminethecostsofdifferentproductvariants (Zhang & Tseng, 2007). Inspired%by%ABC,%the%variety%costs%root%from%the%process%(activity%chain)%variations% due%to%product%variety,%namely%process%variety. (Zhang&Tseng,2007,p.132) Itcanbedeterminedhowproductvariantsaffectcostthroughstudiesofhowthe processesvarydependingontheproductvariety.thiscanbefacilitatedfocusing on the variety while relying on the principles of ABC (Zhang & Tseng, 2007). Variety%costs%are%incremental%to%the%cost%of%the%base%product%and%the%cost%of%tools% and%fixtures%to%produce%the%base%product%are%assumed%as%given. (Zhang & Tseng, 2007, p. 138) Itcanbehardtocarryoutanidentificationofvarietycostdriverswithoutusing aqualitativestudythatcoverswhyandwherecostduetovarietyexist (Zhang & Tseng, 2007). The% cost% information% is% not% required% to% be% exact% but% be% right% in% magnitude%for%the%purpose%of%enabling%the%informed%decisionl%makings. (Zhang& Tseng,2007,p.143) 2.2 VariantManagement Withproductvarietyacompanyisenabledtoselltheirproducttoahigherprice, but at the same time there is a risk for costs within manufacturing and development to intensify. In order to decrease the risk of such costs and thus negatively impact the profit, strategies such as delayed differentiation and modularitycanbeused (Desai, Kekre, Radhakrishnan, & Srinivasan, 2001). At different stages of the product realization variety can be attained, such as duringdesignanddevelopment,production,salesorwhentheproductisbeing used.productvarietycausescomplexitywithinproductionsystems.assemblyis regarded as a cost effective approach when a product is subject to variety. If a productfamilyarchitecturehastheproperdesign,severalfinalproductvariants at the assembly will be achieved through combination of functional modules with several variants. Using a delayed differentiation approach is one way of handlingtheproductvarietyinassemblysystems (Hu et al., 2011). ThepointofproductdifferentiationcaninamixedQproductassemblybedefined as the stage where the product starts to differentiate from the other variants, thusdevelopitsownidentity.thedelayeddifferentiationapproachisimportant 5
18 within the last stages of production in order to attain a cost effective manufacturing method. Assemble To Order, ATO have the advantage that it decreases the risk of loss from obsolescence, since finished products are often thesubjectstoobsolescencethanthecomponentsthefinishedproductsconsists of. If the product is assembled to order and then delivered it is possible by delayed differentiation to keep a stock of subqassemblies and standardized components, which by different combinations can create a large number of productvariants (Hu et al., 2011). Delayed differentiation enables a higher degree of automation, both in the assembly and at earlier stages of the production process if standardized components are used and thus manually create the different product variants. However,inthiscaseitisimportantthatthesetQuptimesisnotlongandcostly duetoforexamplechangeofcomponentsinfeeders.thishasbeenasuccessful principle within the white goods industry for several years.thus obtain small economicalbatchsizeswithinhighvolumeproductfamilies.inordertoobtaina simplermaterialflowitmaybenecessarytochangethedesignoftheproductto attain commonality among the components. The work to find the point of differentiation have traditionally been done by regarding a few factors such as inventoryholdingcost,wipandcapitalinvestments.itmaythoughbepossible tofindthepointofdifferentiationthroughsimulation (Hu et al., 2011). Notallstudiesshowthatmultipleproduciblevariantsthatbuildcomplexitygive higher variable costs in production. It has been shown that within some plants active in the automotive industry that the man hours spent on building do not necessary increase with the number options available but rather increase with optionvariability.meaningthatifacaristobedeliveredwitharangeofoptions thataresubjecttovariabilitythiscancreateproblemsinmanufacturingthatare due to complexity. This complexity can be built away through supplying the customer with standard equipment with large coverage of options. This might lead to a higher unit cost for each product, still it can effectively reduce the complexitythatproductionplantissubjecttowhilemaintainingthecomplexity offunctionsandproductarchitecture (Macduffie, Sethuraman, & Fisher, 1996). The focus of Japanese carmakers during the nineties was: not% so% much% on% reducing%the%numbers%of%platforms%or%the%options%offered,%but%rather%reducing%the% number% of% body% variations% per% platform% and% the% amount% of% parts% complexity% for% each%body%style. (Macduffie, Sethuraman, & Fisher, 1996, p. 367)% Within the car manufacturing industry the leanest plants were the ones that achievedthehighestoverall performance within the industry when 90 plants werestudiedbetween1989and1990.theseplantsshowedthatflexibleplants had no or low increase in variable costs due to an increase of variety of the productcomparedtothemoreinflexibleplants (Macduffie, Sethuraman, & Fisher, 1996). By using common components between several differentiated products may decrease the total manufacturing cost. Even though the direct cost for the product is increased, by for example letting several variants share a premium componentinsteadofdifferentcomponentsindifferentpriceclasses.butdueto the commonality aspect the total manufacturing cost could be lower since 6
19 commonality offers a tradeqoff between revenue and manufacturing costs. However,theimportanceofthedifferentiationcreatedbythecomponentmust be considered. In cases where the component does not affect the evaluation of the product performance or when the component is invisible for the customer, commonality may be something to consider (Desai, Kekre, Radhakrishnan, & Srinivasan, 2001). By sharing common components and also production processes over a platform of products, it is possible for the company to take marketsharesfromcompetitors,developtheirproductsinanefficientwayand also increase the responsiveness and flexibility of the production processes (Robertsson & Ulrich, 1998). PLM,Productlifecyclemanagementisasupportsystemthatcompaniescanuse in order to handle product information within all the life cycle phases. The ambitionofsuchasystemistomanageproductinformationfromrequirement specification to scrap and recycling. However, there does not yet exist such a systemthatisfulfillingtheambitionentirely (Johannesson, Persson, & Pettersson, 2004). 2.3 MassCustomization Mass customization means to produce goods and services that will provide the customers with high level of variety producing near the efficiency of mass production. There is a tradeqoff between cost and variety, mass customization canbeameantoreducetheeffectofit.inordertoachievemasscustomization, the product or service design needs to be flexible and the processes must be responsiveandflexible.theconceptofmasscustomizationisarguedwhetheror not it just drives existing ideas further, as for example flexibility or that mass customizationisanindispensiblesuccessortomassproduction(slack & Lewis, 2008). More%variety%will%make%it%more%likely%that%each%consumer%finds%exactly%the%option% he% or% she% desires% and% will% allow% each% individual% consumer% to% enjoy% a% diversity% of% options%over%time. (Halman, Hofer, & van Vuuren, 2003, p. 150) New operations resources enable companies to meet the demands from increasing fragmented markets. For the management it is important that they have an attitude that is willing and sensitive towards the different customers demands in order to supply customized products or services. This implies a differentapproachinthefollowingactivities,theproductionoftheproductsor services the marketing and the design of them. In order to reduce production costs and at the same time have a wide range of variants, modularization and standardization of components is preferable, which allows standardized productionprocesses(slack & Lewis, 2008). 2.4 Modularity Modularityisanefficientstrategywhenorganisingproductsandprocesseswith a complex design. A system that is modular consists of independent units that composedtogetherwillfunctionasanintegratedentiretythroughstandardized interfaces,whichallowconnectionandcommunicationinaneasyway.theunits or modules can be combined in several ways and thus create systems with modulesofdifferentfunctionalities.inthismanneritispossibletomeetseveral 7
20 different customer demands. The modules can be manufactured in a standardizedwaytoalowcostsincethemoduleitselfisstandardized(slack & Lewis, 2008). Modularity offers several advantages, for example a wide range of product variants that can be composed by a small set of units instead of designing a unique product for every required function. Another advantage is component verificationandtestingduetothefunctionalelementscorrespondstoaspecific unit in the product architecture. A third advantage with modularity is shorter orderleadqtimeifproductsaremadetoorderduetocustomerdemands.byfor example combine standard components in order to make different variants, or makedifferentvariantsbyastandardcomponentandacustomizedcomponent. Thestandardcomponentscaninbothcasesbeinventoriedandfocuscanlieon the customized component or just arrange the standard components(ulrich & Tung, 1991). These% Strategies% has% been% called% the% mushroom% approach% because% the% product% variety% mushrooms %at%or%near%final%assembly%(ulrich & Tung, 1991, p. 75).% With a modularity strategy there is also some potential costs, for example increased unit variable costs due to excess capability. This often occurs when standardized components are used across product lines in order to exploit economiesofscale.thedesignofthecomponentmustbeabletocorrespondto themoststringentrequirements.theunitvariablecostforexcesscapabilitymay be higher than the cost for a specially designed component for that function. Even though, to provide a complete product line with the component functionalitymayresultinaloweroverallcost.anothercostisassociatedwith modularity and performance optimization. By reducing modularity the performance of a product can be improved, for example by reducing mass and sizebyfunctionsharing (Ulrich & Tung, 1991). 2.5 PlatformManagement Aplatformisthecommonbasiswithinaproductfamily.Thereforaplatformis automatically linked to a specific product family. Platform thinking if implementedcorrectlythroughoutthecompaniesbusinesscanbeastrategythat efficiently utilizes resources while it creates room for product variety. When creatingaplatformforaproductfamilyitisarguedthatitshouldnotbebased solely on the product architecture but rather be created from how the whole valuechainlookslike.thismeansthatassetssuchasengineering,manufacturing, brandingetc.shouldberegardedfromawideperspective(halman, Hofer, & van Vuuren, 2003).Whenplanningforproductplatformsitisimportanttoconsider theproductionarchitecture,sinceitdefinestherangeofproductsthatistobe manufactured.forexampleifdifferentmodelsofaplatformshouldbeproduced in the same line, the production architecture will decide the range of possible requirements (Robertsson & Ulrich, 1998)...it%is%generally%accepted%that%designing%a%variety%of%products%based%on%a%product% platform%is%an%efficient%way%to%obtain%good%tradeloffs%between%product%variety%and% costs (Zhang & Tseng, 2007, p. 131) 8
21 Generational or platform development projects sets the foundation for future projects and have a span in design that normally takes several years (Wheelwright & Clark, 1992). Product platforms are not suitable for all types of productsandorbusinesses since they are of a time consuming nature, which meansthatthefirstproducttomarketonanewplatform,willhavealongleadq time(halman, Hofer, & van Vuuren, 2003). 2.6 LeanProduction Duringthe1950:sthedevelopmentsinJapanwithadeeprecessionresultedin thedevelopmentstartforthetps,toyotaproductionsystem(dennis, 2002).The Toyota production system is the basis for the lean production. An important principle in lean production is the elimination of nonqvalue adding activities within the company. There are different forms of waste present namely: overproduction, waiting, unnecessary transports, excess work, excess storage, unnecessary work procedures, defects and unused creativity. Within lean production the TPS house illustrates that TPS is constructed of many different partsthatcreatesthehouse,ifoneelementisweakthenthehouseinwholeis weakened.someoftheconceptscreatingthehousearelevelledproductionand JustInTime,JIT. (Liker, 2009) 2.7 Productionplanningandcontrol Conceptsassociatedwithproductionplanningandcontrolarepresentedinthis section. LeveloutFlow WhencarryingoutamixedmodelproductionorHeijunkathequestistowards production in single pieces or multiple low volume batches per day. The sequence of the different models is set according to the relation between the different volumes of the models that is demanded. The single unit model flow require very short setup times which makes it more realistic to go with low volumebatchesinstead (Jonsson & Mattsson, 2009). WhenproducingaccordingtoHeijunkatheproductionsequenceisnotdirectly derived from the current customer order but from the customer orders over time.thismakesthedemandlevelledoutovertime.sincethecustomerorders are subject to heavy fluctuations this can stabilize the utilization of resources. The reason to produce according to a levelled out demand is that if the productionflowisnotlevelledoutandproductionofdifferentmodelsarespread out according to the demand over time there will arise problems. For example onedaytheworkersmaybesubjecttoovertimepaymentbutthenextsenthome early.thisisareasontowhyproductionplanstocoveracertainamountoftime, for example a day depending on patterns in actual demand and product mix. (Liker,2009) Whenregardingtheproductionflow,onecanseesetQuptimesaswastesinceno valueaddingactivityisperformed.whilstastationisdownduringsetqups,this wouldimplythatlargebatchesarebetterfromthisperspective.stillthebetter solutionmightbetotargetthesetqupsbetweenmodelsorvariantsinsteadand reduce or eliminate these. This can give a higher degree of flexibility since the stocklevelscanbereducedandtheriskofunsoldgoodswillalsobelowered.a 9
22 balanced utilization of the workforce is possible and a unit that requires large amountoflabourcanbepossibletorunsimultaneouswithonesthatrequireless. Ifthesequenceissetsothattheworkerswillhavethetimeneededfortheunit thatrequiresalot,isfollowedbyonethatdonotrequiresasmuchlabour.when theproductionflowislevelledoutthedemandthatarisesbeforethefactory,in terms of goods from suppliers will be more stable, which results in the possibilityforsupplierstoreducetheirstocks.withthisdecreaseoftheirstock, thesuppliers costswillbeloweredresultinginlowerprices(liker,2009). Flexibility Flexibility is one of the five generic performance objectives the other are cost, quality, dependability and speed, which are general classifications where competitive factors can be arranged. Flexibility means the ability to adopt different states, and have two dimensions, range and response. These two denotes how much and how fast an operation can be changed. For example an operationismoreflexiblethananotherifitcanmanagemorethingsandifitcan make a change fast and to a low cost. To describe the flexibility of the total operation it can be done by consider it as a black box and regard the different typesofflexibilitythatwillconducetothecompetitivenessofthetotaloperation. Twoexamplesarevolumeandproductflexibility(Slack & Lewis, 2008). WIP Products that are between or under refinement in valueqaddingresourcesare considered as work in process, WIP. Since production processes takes time to perform work in process arises. When keeping work in process it enables different production rates in different parts of a production system. Since differentprocessesintheproductionsystemisdecoupledfromeachotherwhen workinprocessexists.workinprocesscanbeseenasabufferstocksincebyits decouplingfunctionitdecreasestheriskfordisruptionsinaproductionprocess to distend to another (Jonsson & Mattsson, 2009). Buffers like these hide production problems and are thus considered as costly through a lean perspective(macduffie, Sethuraman, & Fisher, 1996). SawtoothModel Thesawtoothmodelisthecommonnameofaprinciple,whichariseswhenfor examplebatchproductionisused.asimplifiedmodeloftheinventorylevelwill gettheshapeofasawtooth,seeinfigure3sawtoothmodel,andtherebythe name.whenproducinginbatchestheinventorylevelwillatoneoccasiongetan indeliveryofalargeramountofgoods,whichwillbeturnedoversuccessively, thisiscalledstockofturnover.themodelisasimplificationofthereality,which may not have the same time interval between the in deliveries or the same volume (Aronsson, Ekdahl, & Oskarsson, 2004). When the inventory level looks like a saw tooth, the average stock is equal to the stock level divided by two (Jonsson & Mattsson, 2009). 10
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