Stearing of three-dimensional machinings
In most mechanical manufacturing companies, setting machine-tools is a task delegated to the setter who seeks to ensure tolerances. This has the consequence of increasing the adjustment time with a quality that is not at the desired level. Over the past six years, the SYMME laboratory has developed steering methods (Copilot -Pro ® and inertial steering) to solve the problem of setting machine tools. Based on these methods, the works presented make a synthesis and presents new advances in steering of digital controls (CNC) to obtain the best quality regardless of the complexity of the part. The contribution of this workis presented in five chapters. The first chapter presents the general context of the research and makes a state of the art of existing works, on the one hand on the steering and on the other hand on the conformity. The steering consists in reducing the variability around the target products and the conformity consists in verifyingthat the dispersion of a characteristic is inside its tolerance interval. The second chapter discusses the methods of steering which consist in establishing the relationship between the characteristics of the workpiece and thetool-offsets and propose solutions to improve the calculation of the correction taking into account both tolerances and number of points probed on the surfaces of the workpiece. The third chapter presents the steering strategies and highlights the limitations of conventional methods for detecting out of control situations which are the Shewhart's control card and the T² Hotelling’s card. The fourth chapter is a synthesis of methodologies to facilitate the deployment of the methods in the industry. The fifth chapter presents an experimental application of inertial steering and a debriefing on the matrix steering used in a watch manufacturer company. Conclusion reiterates the main contributions of this work