Optimization of Superplastic Forming Process of AA7075 Alloy for the Best Wall Thickness Distribution

• Published in: Advances in technology innovation Vol. 6; no. 4; pp. 251 - 261
• Main Authors: Nguyen, Manh Tien, Nguyen, Truong An, Tran, Duc Hoan, Le, Van Thao
• Format: Journal Article
• Language: English
• Published: Taiwan Taiwan Association of Engineering and Technology Innovation 16.09.2021
• Subjects: AA7075 alloy; Algorithms; Aluminum base alloys; Deformation; Optimization; Process parameters; response surface; Response surface methodology; Superplastic forming; Superplasticity; Thickness; Thinning; Variance analysis; wall thickness distribution
• ISSN: 2415-0436; 2518-2994
• DOI: 10.46604/aiti.2021.7835

This work aims to optimize the process parameters for improving the wall thickness distribution of the sheet superplastic forming process of AA7075 alloy. The considered factors include forming pressure p (MPa), deformation temperature T (°C), and forming time t (minutes), while the responses are the thinning degree of the wall thickness ε (%) and the relative height of the product h*. First, a series of experiments are conducted in conjunction with response surface method (RSM) to render the relationship between inputs and outputs. Subsequently, an analysis of variance (ANOVA) is conducted to verify the response significance and parameter effects. Finally, a numerical optimization algorithm is used to determine the best forming conditions. The results indicate that the thinning degree of 13.121% is achieved at the forming pressure of 0.7 MPa, the deformation temperature of 500°C, and the forming time of 31 minutes.