반용융 단조 공정에 의한 자동차용 알루미늄 피스톤 제조에 관한 연구

Aluminum engine piston is manufactured by thixoforging according to forming variables. It is very important to find effects of forming variables on final products in thixoforging. In order to find the effects, however, many researchers and industrial technicians have depended upon too many types of experiments. In this study, the process parameters which have influences on thixoforging process of aluminum automotive engine piston are found by a statistical method and the correlation equations between the process parameters and quality of product are approximated through the surface response analysis. Forming variables such as initial solid fraction, die temperature, and compression holding time are considered for manufacturing aluminum engine piston by thixoforging. Hardness and microstructure are inspected so that optimal forming condition is found by the statistical approach.