The FE Structure Analysis And Optimization Of 100MN Isothermal Forging Hydraulic Press

Hydraulic press is one kind of important equipments in forming. It is irreplaceable in the defense and aviation industry for production of large-size forgings. The performance and quality of the press is related directly to its design. There are many problems in traditional design methods such as long design cycle, structure redundancy, high cost and lack of validation. So it is necessary to bring the FEM and optimum design into the design process of the press in order to improve the design quality and fulfill the need of the manufacture industry.Taking 100MN Numerical control Isothermal Forging Hydraulic Press as the research object, this dissertation established the refined FEM model of the press, which was mainly built with shell element, and a validation check on the primary design of the press was carried out. And then a parametric FE model of the press was created in Python and a series of FE numerical experiments were carried out based on the parametric model and the orthogonal experimental method (OEM). An approximately optimization model for the light weight design of the press was set up based on the FE numerical experiments. The optimization model includes 10 dimensions parameters extracted from 5 parts. The design constraints are composed of the stiffness and strength of the structure of the press and obtained by one-order response face method (RFM). So the optimization mathematic model aimed at the total mass of press is established. Two groups of results are gained and analyzed through the solution to the model by the genetic algorithm (GA):(1) Reduce the total mass by 8.39% with no improvement in stiffness of the press;(2) Increase the stiffness of the upper beam by 16.54% and reduce the total mass by 4.18%.Taking the optimization of the large-sized press as an example, this dissertation tries to generalize the optimization methods and process and build the technology system for structure optimum design, which can be applied to the other large-sized and complex manufacturing equipments.