Abstract
A novel semi-solid die forging process for the 6061-aluminum rim support disc was proposed and investigated. An improved constitutive model was established based on the Arrhenius-type equation by integrating a hyperbolic sine function and a term representing the liquid phase fraction. With the improved constitutive model, the predictive error of peak stress was reduced from 15.45% to 5.51%. The L16 (41 × 31 × 31) orthogonal experimental design was employed to explore the influence of billet temperature, mold temperature, and die speed on key indicators including the forming force, effective stress and effective strain. Optimum process parameters were determined as a billet temperature of 630°C, a mold temperature of 300°C, and a primary die speed of 75 mm/s. Experimental validation was conducted under these optimum process parameters, resulting in sufficient cavity filling and refined microstructures with an average grain size of 68 μm. The maximum forming load was reduced by 83% to 116t, while maintaining the tensile strength and elongation still within requirements.
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