This thesis has been conducted at Ovako Bar for a period of 10 weeks and is the final part of the bachelor's programme in mechanical engineering. Ovako Bar is a business unit of the European steel concern Ovako which specializes in the manufacturing of engineering steel for applications in various fields of mechanical engineering. The company wants to improve profitability of their sawing centre by reducing the consumption of saw blades and increase productivity at one of their sawing machines. In the current situation the company uses disposable blades which are discarded either when a tool break occurs or when the quality requirements are no longer met for the outgoing material. A literature review was conducted in which various factors affecting the life span of the saw blades were analyzed after their impact on the outcome in which two factors was selected to be used for a design of experiments. The factors selected were feed per tooth and cutting speed in which a total of four experiments were conducted and finally the results showed that the interaction effect was the decisive factor for the outcome. To investigate the tool wear that had arisen a scanning electron microscope was used where a few teeth on each blade were studied for any damages. The conclusions that could be drawn from the experiment is that a high feed rate must be combined with a high cutting speed for best result which has to do with the fact that a higher feed requires a greater heat generation for the best chip formation. The same applies for the lower feed rate which must be combined with a lower cutting speed because a higher cutting speed causes a dominating wear on the clearance face.

Bakgrund: Under de senaste decennierna har industriell logistik fått en allt viktigare roll för att ge företag konkurrensfördelar på den globala marknaden. För att uppnå ökad effektivitet i logistikfunktionen kan konfigurationen av ett internt materialförsörjningssystem ha en betydande inverkan på minimering av icke värdeadderande aktiviteter. Det finns flera principer för intern materialförsörjning, hur dessa appliceras har en signifikant påverkan i en industriell miljö. Valet mellan olika system kännetecknas av en överhängande komplexitet där tillverkningsindustrier byter fram och tillbaka flera gånger. Syfte: Syftet med studien är att föreslå ett ramverk för utveckling av interna materialförsörjningssystem gällande svetsprocess inom metallbearbetning. Genomförande: Studien är genomförd som en enfallsstudie på Hörle Automatic. Där studiens tillvägagångsätt har varit att identifiera icke värdeadderade aktiviteter i fallföretagets interna materialförsörjningssystem till svetsprocessen. För att därefter utveckla deras nuvarande system för att minimera identifierade aktiviteter. Utifrån detta har ett ramverk konstruerats som belyser faktor som ska tas i beaktning vid utveckling av ett internt materialförsörjningssystem. Empiriskt material har samlats in genom intervjuer, observationer, fokusgrupper och arkivmaterial. För att möjliggöra identifiering av icke värdeadderande aktiviteter har en processkartläggning upprättats. Fortsättningsvis har det genomförts tester gällande förslag på arbetssätt som utvecklats. Resultat/Diskussion: Ett ramverk har konstruerats som belyser elva olika faktorer som ska tas i beaktning vid utveckling av ett internt materialförsörjningsystem. Det är faktorer relaterade till produktionsvariation, detaljspecifikation, layout, leverantörer och kommunikation. Slutsats: Det har identifierats totalt 18 icke värdeadderande aktiviteter gällande Hörle Automatics interna materialförsörjningssystem till svetsprocessen. Utvecklingen av det interna materialförsörjningssystemet enligt förslag eliminerar en del icke värdeadderande aktiviteterna som identifierats. Resterande aktiviteter minskas genom utvecklingen av en materialförsörjningsprocess som möjliggör en ny layout och att mer kostnadseffektiv personal utför de icke värdeadderande aktiviteterna / Background: Over the past decades, industrial logistics has gained an increasingly important role in giving companies a competitive edge in the global market. To achieve increased efficiency in the logistics function, the configuration of an internal materials supply system may have a significant impact on minimizing non-value added activities. There are several principles for internal materials supply system, how these are applied have a great impact on it’s industrial environment. The choice between different systems is characterized by an complexity where manufacturing industries change back and forth several times. Purpose: The purpose of this study is to propose a framework for the development of internal materials supply systems in the welding process within metalworking. Methodology: This is a case study at Hörle Automatic. The study approach has been to identify non-value adding activities in the case company's internal materials supply system to the welding process. And after that develop their current system to minimize identified activities. Based on this, a framework has been designed to highlight the factors to be taken into account when developing an internal materials supply system. Empirical material has been collected through interviews, observations, focus groups and archival material. To enable identification of nonvalue-adding activities, a process mapping has been established. Furthermore, tests have been carried out regarding internal materials supply processes to strengthen the author's proposal. Result/Discussion: The result of the study is a framework including eleven factors that companies should take into account when developing an internal materials supply system. The framework involves factors regarding, production variation, item specification, layout, suppliers, and communication. Conclusion: A total of 18 non-value adding activities was identified regarding Hörle Automatic's internal materials supply system in their welding process. The development of the internal materials supply system as proposed eliminates some of the identified nonvalue-adding activities performed by welding operators. The remaining activities are reduced through a new layout and that usage of more cost-effective personnel.