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University of Technology
Supply chains more sustainable by using value stream mapping  Lars Medbo and Carl Wänström Chalmers University of Technology Division of Logistics and Transportation
Agenda ,[object Object],[object Object],[object Object],[object Object]
Value stream mapping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
VSM & materials handling – Why? Conveyor   belt Pick and  pack into pallet Transport with pallet jack Pack into pallet Loading with forklift Quality check Move with pallet jack to buffer Put on lid Strap Put on label Transport with forklift to storage Transport label Transport with forklift Transport to preparing area Recieving registration Unloading Inspection counting Label
Production and value stream vs. Materials handling and supply chain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
VSM – How to determine Supply chain performance?  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],* Relation to handled volume of components and packages (different levels)
The Performance in the Supply Chain
VSM – Materials handling system process mapping variables?  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A case study of value stream mapping in a supply chain  ,[object Object],[object Object],[object Object],Pre-Conditions
VSM – Current State Value Stream Map Supplier Transport 3:e part Customer Transport Takt time 67 sec.
VSM –  Current State FIFO FIFO 10days  Total 37 processes
Guidelines for the future state map of the materials handling system cont. ,[object Object],[object Object],[object Object],[object Object],[object Object],As extended continuous flow as possible: ,[object Object],[object Object],[object Object],[object Object],[object Object],“ A  smooth flow without detours that generates the shortest lead time, highest quality and lowest cost” M. Rother, J. Shook,  Learning to see,  2002
Results ,[object Object],[object Object],[object Object],[object Object]
VSM – Future state Supplier Transport Customer
Results Item1 Item 1 Item 2 Item 2 Change Change   Current Future Current Future Item 1 Item 2 Throughput time internal (days) 8,8 4,6 2,8 1,2 -47 % -57 % Throughput time external transport (days) 1,5 0,7 0,1 0,1 -52 % 0 % Time in storage (days) 8,7 4,6 2,7 1,2 -47 % -57 % Items in flow (no. of units) 7 326 4 285 940 406 -42 % -57 % Transport distance, internal (meter) 786 368 2 076 225 -53 % -89 % Transport distance, external (meter) 231 000 231 000 112 500 112 500 0 % 0 % Man hour/item (sec) 10,3 3,6 288 95 -64 % -67 % Machine time/it em (sec) 8,4 0,0 0 0 -100 %   Number of handling activities 7 4 11 9 -43 % -18 % Number of transport activities 21 6 10 2 -71 % -80 % Number of administration activities 9 1 7 3 -88 % -57 % Number of storage/buffer-places 15 4 13 3 -73 % -77 % Sum of activities and  storage/buffer-places  51 15 41 17 -71 % -59 %

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Session 37 Carl Wänström

  • 2. Supply chains more sustainable by using value stream mapping Lars Medbo and Carl Wänström Chalmers University of Technology Division of Logistics and Transportation
  • 3.
  • 4.
  • 5. VSM & materials handling – Why? Conveyor belt Pick and pack into pallet Transport with pallet jack Pack into pallet Loading with forklift Quality check Move with pallet jack to buffer Put on lid Strap Put on label Transport with forklift to storage Transport label Transport with forklift Transport to preparing area Recieving registration Unloading Inspection counting Label
  • 6.
  • 7.
  • 8. The Performance in the Supply Chain
  • 9.
  • 10.
  • 11. VSM – Current State Value Stream Map Supplier Transport 3:e part Customer Transport Takt time 67 sec.
  • 12. VSM – Current State FIFO FIFO 10days Total 37 processes
  • 13.
  • 14.
  • 15. VSM – Future state Supplier Transport Customer
  • 16. Results Item1 Item 1 Item 2 Item 2 Change Change   Current Future Current Future Item 1 Item 2 Throughput time internal (days) 8,8 4,6 2,8 1,2 -47 % -57 % Throughput time external transport (days) 1,5 0,7 0,1 0,1 -52 % 0 % Time in storage (days) 8,7 4,6 2,7 1,2 -47 % -57 % Items in flow (no. of units) 7 326 4 285 940 406 -42 % -57 % Transport distance, internal (meter) 786 368 2 076 225 -53 % -89 % Transport distance, external (meter) 231 000 231 000 112 500 112 500 0 % 0 % Man hour/item (sec) 10,3 3,6 288 95 -64 % -67 % Machine time/it em (sec) 8,4 0,0 0 0 -100 %   Number of handling activities 7 4 11 9 -43 % -18 % Number of transport activities 21 6 10 2 -71 % -80 % Number of administration activities 9 1 7 3 -88 % -57 % Number of storage/buffer-places 15 4 13 3 -73 % -77 % Sum of activities and storage/buffer-places 51 15 41 17 -71 % -59 %

Editor's Notes

  1. Aktiviteter – här är även logistikaktiviteter som Hantering = omplock, sortera, bandning lyfta upp på bil Administration = Kontroll, flagga på Antal detaljer i flödet = PIA, buffertar, lager, förråd (mät i dagar) Antal ompackningar = antal olika förpackningar
  2. Takttid (14h*60*60)/756st = 67sek/st
  3. Förenklad bild utan informationsflöde
  4. Vad är det verkliga kundbehovet? Efterfrågan, takt och fysisk utformning (ex. exponering av artiklar på monteringsstation). Till vilken grad är kontinuerligt flöde möjligt att åstadkomma? Utforma ett så utvidgat kontinuerligt flöde som möjligt – så få stopp som möjligt: - Så få processteg som möjligt - Så få lagrings/bufferteringsplatser som möjligt - Så få hanteringar som möjligt - Så små batcher som möjligt, helst enstycksflöde. Tag hänsyn till transportplanering. - Anpassa förpackningar till små batcher. Hur åstadkoms dragande system? - Undvik överproduktion – inget ”upparbete” Hur kan utjämnat flöde åstadkommas? Hur kan försörjningskedjans flöde synkroniseras till takten i kundens produktion? Hur kan försörjningskedjan ytterligare förbättras?
  5. Räkneexempel Antag produktion av 100000 bilar/år, Mantidskostnad 400kr/tim Per bil: Stora artiklar 170, Medelstora 500, Små 700 Potentiell mantidsbesparing i försörjningskedjan: Stora artiklar 190sek, Medelstora 6sek, Små 1sek. Potentiell besparing per år 400 miljoner kronor. (359 stora+33 medel+8 små) Slutsats: Lägg ner arbete på att effektivisera försörjningskedjan för stora artiklar.