Optimisation de la taille de la s\'erie: illustration par un cas industriel de sous-traitance m\'ecanique

TL;DR

This paper develops a decision support model for mechanical subcontracting companies to optimize production size, balancing opportunity mix, economic constraints, and risk of unsold inventory, to reduce manufacturing costs.

Contribution

It introduces a novel decision model that considers sales opportunities, economic factors, and inventory risks for production size optimization in subcontracting firms.

Findings

The model highlights the importance of high ownership rates.

It assesses the limits of producing beyond demand.

Provides decision elements for balancing costs and sales opportunities.

Abstract

Reducing costs of manufactured products is one of the key issues of companies. Bar turning companies (mechanical subcontracting companies) are faced with the following dilemma: use a pull strategy or use a push strategy. Instinctively these companies produce more than demand required by customers. This strategy allows them to respond to requests forecasts and reduce their cost of changeover time. These companies make a bet on sales opportunities and think to realize an additional profit. We have tried to find in this study to provide elements to know the limits of this strategy. Our proposal focuses on developing a model to support the decision taking into account the mix of opportunities, economic constraints and mean constraints. This model features the particular importance of high rates of ownership and the risk of not selling. R\'eduire les co\^uts de revient des produits fabriqu\'es est une des probl\'ematiques essentielles des entreprises d'aujourd'hui. Les entreprises de d\'ecolletage (entreprises de sous-traitance m\'ecanique) sont confront\'ees au dilemme suivant : produire juste la demande client ou produire plus. Instinctivement ces entreprises, dont les temps de changement de s\'erie sont \'elev\'es, cherchent \`a produire plus que la demande exig\'ee par le client. Cette strat\'egie leur permet de r\'epondre \`a des demandes pr\'evisionnelles et r\'eduire ainsi le co\^ut de revient des produits. Ces entreprises r\'ealisent un pari sur les opportunit\'es de vente et pensent r\'ealiser un gain suppl\'ementaire en r\'ealisant des stocks. Nous avons cherch\'e dans cette \'etude \`a fournir des \'el\'ements de d\'ecision pour conna\^itre les limites de cette r\`egle de gestion. Notre proposition porte sur le d\'eveloppement d'un mod\`ele d'aide \`a la d\'ecision prenant en consid\'eration le mixte entre opportunit\'es commerciales, contraintes \'economiques et contraintes de moyen. Ce mod\`ele souligne l'importance particuli\`ere du taux de possession et du risque de non vente.