Tolerance analysis in multi-operational machining process based on the Model of Manufactured Part
Résumé
Today, for designing a new product in an industrial context, designers use CAD models. Since it is impossible to manufacture a part to its exact dimensions, some variations of manufacturing dimensions are allowed. To this end, designers specify tolerances. Manufacturing engineers are then faced with the problem of selecting appropriate process plan (machining processes and production equipment) to ensure that design tolerances are satisfied. Developing a suitable process plan for release to production is a complicated and time consuming process. The purpose of tolerance analysis is to verify whether the design tolerance requirements can be met when a process plan is given with specified manufacturing errors. In this paper, the model of manufactured part (MMP) is proposed for modeling the error propagation in a multi-operational machining process. The MPP is then used for tolerance analysis. The tolerance analysis is done by worst case researching. The worst case researching is expressed as a multi layer optimization problem. This paper aims to propose a solution technique to this optimization problem and compares performance of different current optimization algorithms for solving the worst case researching.