Gammes et cotation pour le réglage des machines-outils de décolletage

摘要

Production equipment has undergone significant technical developments in recent decades. The current trend is to minimize the number of setups required to machine a part in order to improve the cycle time and accuracy. The screw machining industry is heavily subject to the problem of meeting increasing production volumes under stronger customer requirements. Unfortunately, methodological tools and software packages have not evolved at the same pace and the industrialization of parts of increasing complexity remains a serious problem. However, "academic" industrialization methods do exist, but they were initially designed for conventional part machining out of plots of material and are not adequate when machining parts out of bars, which is the main characteristic of screw machining. The flow method presented in this thesis tackles this problem by providing a systematic approach to the methods technicians, enabling them to sequence the different manufacturing operations into a minimum number of steps and thus a minimum number of machine halts. To do so, we propose a formal description of the manufacturing process, organizing it in work stations, setups and manufacturing operations. We then propose to organize the manufacturing operations in steps intended either for the initial or periodical setting up of machines, or for their monitoring in production. The creation of a different setting up plan than the monitoring plan seems essential and is consistent with the fact that the setting up and monitoring of machines are often carried out by two different persons in industry, in this case, a setter and an operator. For each of the plans, we determine a set of working dimensions through an innovative approach called the "chain of dimensions of minimal measurement uncertainty". To this set of working dimensions, we propose to add a new set of dimensions that we call "pilot dimensions". These correspond to the parameters on which the operators can act upon in order to correct working dimension deviations. A spreadsheet is then generated for the operator. This spreadsheet will provide the operator with the corrections that need to be carried out on the pilot dimensions based on the deviations measured from the working dimensions for each step of the setting up or monitoring process. Experiments on industrial cases have helped us to validate our approach wich has been implemented in an industrialization software package called Copilot Proä . This research program is the result of the collaboration between the SYMME laboratory of the "Université de Savoie" and the "Centre Technique de l'industrie du Décolletage", and is also part of the "Tolérancement et Qualité des produits" program of the "Pôle de Compétitivité Arve-Industries Haute-Savoie Mont-Blanc".