DESIGN OF OPTIMAL PROCESS PARAMETERS FOR NONISOTHERMAL FORGING

This paper presents a state space model and an optimal design scheme f or non-isothermal metal forming processes. By selecting nodal velocity and temperature as the state variables, a non-isothermal state equati on with coupled deformation and thermal terms is established. Based on this state space model, a control design scheme is developed to obtai n the optimal die velocity and initial die temperature which will ensu re that the effective strain-rate and temperature satisfy the design r equirements. A titanium alloy engine disk forging is used to demonstra te two design examples. The results show that the proposed model and d esign scheme behave well for different design requirements.