Designing preform using FEM and response surface method to optimise strain distribution in forging of turbine blade

摘要

Forging is one of the production methods of turbine blades. But because of the complexities of the blades, they cannot be produced in one stage and it is necessary to perform preform. In this paper, an extruded elliptical cross section was considered as blade preform, then response surface method (RSM) was applied to optimise this preform. The maximum filling ratio of final die and the minimum strain variance of final blade were considered as objective of optimisation. Design expert software was used for design of experiment and optimisation, also Deform-3D software was applied to simulate the forging process. The optimised preform was compared with the preform resulted from conventional preform designing method.