Forging process of medium-pressure-type rheology materials fabricated with electromagnetic stirrer

摘要

This paper describes a rheo-forming process for the development of automobile suspension parts by using rheology material with electromagnetic stirring equipment. Generally, the liquid forging process takes place under high pressure of 1,000 bar. The productivity of the liquid forging is higher than that of the lower pressure die-casting. In order to improve mechanical properties, the rheology forging process by using medium pressure (<500 bar) with electromagnetic stirring equipment has been proposed for fabrication of rheology material with controlled solid fraction. From the analysis of filling and solidification, the die design of medium vertical forging process by electromagnetic stirrer equipment has been proposed for the development of an arm part. The microstructure and mechanical properties of suspension parts were investigated with and without heat treatment. Based on the microstructure, observation revealed the arm part with fine and spherodized α-Al phase particles. As a result, the uniform eutectic structure enhanced the mechanical properties of the suspension part.