Papers by Keyword: Process Yield

Abstract: Determining the best tool replacement time is important for minimizing overall manufacturing costs. Utilizing the yield index, the true process yield for dynamic processes with tool wear can be estimated, and the tool wear problem can be controlled. However, no measurement is free from error or uncertainty, a realistic approach is to assume that observed data contain a degree of imprecision. Thus, this study applies the fuzzy theory to the tool wear control problem. A decision rule is proposed to determine the appropriate time to replace a tool.

Abstract: For the steel castings which is thin wall, uniform thickness, complex structure, and no special mechanical properties, it is feasible that the foundry technology was designed according to the last solidifying feeding mechanism. Adopting this process for the thin wall steel castings, the pouring temperature must be controlled and the gating system be designed rationally. Using self-feeding shrinkage in solidification, and the casting was poured and congealing at the same time. The shrinkage of finally congealing part was fed by small riser or gating system (no riser). Using this foundry technology, the casting process yield and surface quality of casting may be improved, the production cost is reduced, and the requirements of mechanical properties can be met.