Reliability based casting process design optimisation

Abstract

Deterministic optimum designs are unreliable without consideration of the statistical and physical uncertainties in the casting process. In the present research, casting simulation is integrated with a general purpose reliability based design optimisation (RBDO) software tool that considers uncertainties in both the input variables as well as in the model itself. The output consists of an optimal design that meets a specified reliability. An example casting process design is presented where the shape of a riser is optimised while considering uncertainties in the fill level and riser diameter. It is shown that RBDO provides a much different optimum design than a traditional deterministic approach. The deterministic optimal solution offers a 12% increase in casting yield over typical safety margin design practice, but has an unacceptable 61% probability of failure. The RBDO design has a 7% increase in casting yield over the safety margin approach and a probability of failure of 4?6%.

Comparative Evaluation of Insulation Cotton Configuration on The Investment Casting Quality of Industrial Valve Parts

“…Nowadays, advanced computer-aided engineering (CAE) simulation has many advantages in product improvement, such as product quality, reduction of production costs, and shortening of production cycles [13][14][15]. Computer-aided engineering simulation analysis is the most effective and pro table technology for evaluating casting quality and predicting defects [16][17][18].…”