Syftet med denna studie är att öka förståelsen för hur ett ständigt förbättringsarbete kan eliminera problem som stoppar genomflödet i en linjeproduktion. Studien behandlar metoder för hur de största problemområdena och dess rotorsaker identifieras och hur arbetet mot att eliminera dem kan gå tillväga.  Studien har utförts på uppdrag av Estrella AB, beläget i Angered, och fokuserar på en begränsad del i deras produktion kallad kartongsystemet. För att uppfylla syftet genomfördes litteraturstudier inom berörda områden, intervjuer med personal och en mer omfattande studie kallad observationsstudien. En observerande studie där fokus låg på att göra tidsmätningar för att hitta de största problemområdena inom det studerade kartongsystemet.  Med hjälp av mätningarna kunde vidare analyser göras för att komma fram till problemens rotorsak och vart fokus för ett förbättringsarbete bör ligga och hur ett förbättringsarbete skulle kunna genomföras.  Observationsstudien och en analys av data visade att mänsklig påverkan och bristen på standarder är den största orsaken till varför stopp i genomflödet uppkommer. / The purpose of this study is to increase the understanding of how continuous improvement efforts can eliminate problems that stops the throughput of a serial production line. The study use methods for how the largest problem areas are found and how the work towards eliminating them can proceed.  The study was conducted on request from Estrella AB, a company located in Angered, focusing on a limited part of their production called the carton system. In order to fulfill the purpose, literature studies in the relevant areas were conducted, interviews with workers and a more comprehensive study called the observatory study. A observatory study where the focus was on finding time measurements to be able to find the largest problem areas within the student carton system.  With the help of the measurements, an analysis was made to find out the root cause for the problems. It also helped to find where the focus of an improvement work should be and how the work could be carried out. Through the observation study and an analysis of the data the conclusions were that human impact and the lack of standardized work is the main reason why stop in the throughput occurs.

Dans un contexte de prix de marché fixes et exogènes pour un ensemble de biens choisis pour être produits, le problème de conception d'une chaine logistique a été analysé comme un problème de formation d'une coalition dans le cadre de la théorie des jeux coopératifs, et formulé comme un jeu de production linéaire. Dans un premier temps, ce travail étudie la compatibilité entre la formation d'une coalition stable et l'allocation équitable du profit total entre les participants. Il est montré qu'en général, le mécanisme d'allocation purement compétitif ne vérifie pas la propriété d'équité. Deux techniques ont été proposées pour corriger ce défaut. La première consiste en l'introduction de paiements de transfert entre les membres de la coalition optimale. La deuxième technique se base sur la substitution des contraintes de capacité de ressources par des contraintes de saturation linéaires par morceaux. Par ailleurs, si la coalition d'entreprises décide de s'organiser sous forme d'une chaine logistique et d'imposer le prix de gros de ses produits fabriqués, alors le problème de conception de chaine logistique soumis à une hypothèse de demande aléatoire élastique peut être formulé grâce au modèle du jeu biforme. Cette situation génère un jeu de production quadratique (JPQ) jusqu'alors inexistant dans la littérature. Il est montré que ce jeu a un cœur non vide et qu'il est en général non convexe. Enfin, il est démontré qu'en général l'optimum global de la chaine logistique n'est atteint que lorsque la coalition d'entreprises vend directement ses produits sur le marché final sans intervention du détaillant. / In the context of fixed market prices for a set of goods selected to be manufactured, the design of a supply chain network can be interpreted as a coalition formation problem in the cooperative game theory framework and formulated as a linear production game (LPG). This study investigates the possibility of combining the requirement of coalition stability with a fair allocation of profits to the participants. It is shown that, in general, the purely competitive allocation mechanism does not exhibit the property of fairness. Two techniques are proposed to correct this defect. The first one consists in introducing transfer payments among the players of the optimal coalition. The second technique relies on an improved representation of capacitated resources through clearing functions. Now, if an enterprise network decides to organize itself as a supply chain and imposes the wholesale price of its manufactured goods, then the supply chain design problem under a price elastic random demand from the market can be formulated as a biform game. This situation has generated a quadratic production game (QPG) not yet studied in the literature. It has been shown that this game has a non empty core and it is generally non convex. Finally, it has been proved that global profit optimality is obtained if the manufacturing network is directly selling the goods to the market rather than to a retailer.

The aim of this work was to design the construction of transport equipment under industrial robot, pallet holder or other equipment. This manipulation device can be moved in one axis on a rigid guide. The device is designed for use in a linear manufacturing system for handling workpieces and tools. It is capable of operating two rows of machines when it is placed in the middle. The main function of this device is to extend the workspace to the carried devices. This type of construction can be used in combination with an industrial robot for other technological tasks such as welding or light machining. The main parts of this device include statically mounted beds that can be stacked behind each other to form optionally long conveyor paths and a positioning plate that moves along the path formed by these beds. An industrial robot, pallet holder or other device is attached to this positioning plate. In addition to the design itself, the thesis also includes a thorough research of the issue, further possibilities of solution in the form of concepts, verification of the structure by means of calculations and simulations and implementation of the solution into a specific production cell.