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An improvement of the logistic performance for a supplier in a single echelon supply chain by implementing sales lead times in the safety stock policy.: A case study at Bosch Rexroth AB
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Välutvecklade logistiska processer kan ge ett företag stora konkurrensfördelar vilket resulterar i ökade marknadsandelar (Christopher, 1998). En stor del av den logistiska processen är lagerhållning. Inom lagerhållning är dilemmat var och i vilka kvantiteter lagret skall hållas. I detta arbete är det lagerkvantiteterna som har undersökts. Vanligtvis består ett lager av två delar säkerhetslager och omsättningslager. Ett säkerhetslager används för att hantera fluktuationer i efterfrågan. Ett för litet säkerhetslager kan leda till missade kundorder och extra kostnader. Medan ett för stort säkerhetslager gör att kapitelbindningen och lagerkostnaderna blir onödigt stora, varför företag strävar till att minska dessa kostnader (Crocker, et al., 2012).Bosch Rexroth har nyligen infört säljledtider gentemot kund, detta skapar utrymme för att minska lagret. Samtidigt kan deras produkter säljas på två sätt, som reservdel eller så kan den användas som komponent i deras produktion. För dessa tre ändamål har produkten en bestämd inköpsledtid, men tre olika säljledtider och säljs i olika kvantiteter för de tre olika ändamålen. Med dessa förutsättningar har vi undersökt vilka möjligheter som finns till att förbättra den logistiska prestandan då ett väl koordinerat säkerhetslager kan leda till kostnadsbesparingar på mer än 15 % (Kelle, 2005).I detta arbete har två olika koncepts utvärderats, en ny säkerhetslagerberäkning och en alternativ ABC-klassificering. Dessa två koncept utvärderades genom simulering i ExtendSim för att se att de nådde upp till samma fyllnadsgrad som tidigare. Våra resultat visar att det med en alternativ ABC-klassificering och en förfinad säkerhetslagerberäkning går att sänka säkerhetslagerkostnaderna med nästan 60 % utan att minska fyllnadsgraden. Fyllnadsgraden mättes genom ett flertal simuleringar med data insamlad både ifrån fallstudien och slumpmässig.

Abstract [en]

Logistics management is increasingly seen as a source for competitive advantage. Managing it efficiently leads to reduced costs which provide the company the opportunity to increase their market shares (Christopher, 1998). The usage of warehouses is an important aspect in logistic management. Warehouses are however usually associated with increased costs rather than increased customer value. Companies therefore strive to reduce all costs associated with warehousing by minimizing the time items are stored in the warehouse (Crocker, et al., 2012). By lowering the inventory, the companies however increase their risk for stock-outs which may lead to increased cost rather than decreased along with annulled orders. To prevent such things from happening companies can apply a safety inventory. The safety inventory also known as the safety stock is intended to handle such risk that is caused by variations. These variations are usually associated with fluctuations in demand, delayed replenishment orders or deviation in quantity. If the safety stock is coordinated well it can lead to cost savings of more than 15 % (Kelle, 2005).Bosch Rexroth AB have recently implemented a sales lead time in their business strategy with aim to reduce the inventory costs hence make them more competitive. However, even after these changes the safety stock policy has remained the same. In this report alternative calculation methods have been investigated with expectation to decrease the safety inventory costs while keeping the same level of. Furthermore, the current ABC-classification has been investigated as well.In this work two different concepts were reviewed, a new safety stock calculation and a new ABC-classification, with aim to integrate the sales lead times. In the end, a combination of these concepts where used which resulted in a reduction of the safety inventory by 60 % while remaining the same level of delivery performance. The delivery performance was measured through multiply simulations with both real data gathered from the case study and randomized numbers.

Place, publisher, year, edition, pages
2016. , 81 p.
Series
Degree Project in Production Engineering, Second Level, 680
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-189453OAI: oai:DiVA.org:kth-189453DiVA: diva2:946085
Supervisors
Examiners
Available from: 2016-07-04 Created: 2016-07-04 Last updated: 2016-07-04Bibliographically approved

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