# Frontiers of Mechanical Engineering

 Front. Mech. Eng.    2018, Vol. 13 Issue (3) : 376-384     https://doi.org/10.1007/s11465-018-0500-3
 RESEARCH ARTICLE
Robust optimization of the billet for isothermal local loading transitional region of a Ti-alloy rib-web component based on dual-response surface method
Ke WEI, Xiaoguang FAN(), Mei ZHAN, Miao MENG
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710071, China
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 Abstract Billet optimization can greatly improve the forming quality of the transitional region in the isothermal local loading forming (ILLF) of large-scale Ti-alloy rib-web components. However, the final quality of the transitional region may be deteriorated by uncontrollable factors, such as the manufacturing tolerance of the preforming billet, fluctuation of the stroke length, and friction factor. Thus, a dual-response surface method (RSM)-based robust optimization of the billet was proposed to address the uncontrollable factors in transitional region of the ILLF. Given that the die underfilling and folding defect are two key factors that influence the forming quality of the transitional region, minimizing the mean and standard deviation of the die underfilling rate and avoiding folding defect were defined as the objective function and constraint condition in robust optimization. Then, the cross array design was constructed, a dual-RSM model was established for the mean and standard deviation of the die underfilling rate by considering the size parameters of the billet and uncontrollable factors. Subsequently, an optimum solution was derived to achieve the robust optimization of the billet. A case study on robust optimization was conducted. Good results were attained for improving the die filling and avoiding folding defect, suggesting that the robust optimization of the billet in the transitional region of the ILLF was efficient and reliable. Corresponding Author(s): Xiaoguang FAN Just Accepted Date: 15 January 2018   Online First Date: 08 March 2018    Issue Date: 11 June 2018
 Cite this article: Ke WEI,Xiaoguang FAN,Mei ZHAN, et al. Robust optimization of the billet for isothermal local loading transitional region of a Ti-alloy rib-web component based on dual-response surface method[J]. Front. Mech. Eng., 2018, 13(3): 376-384. URL: http://journal.hep.com.cn/fme/EN/10.1007/s11465-018-0500-3 http://journal.hep.com.cn/fme/EN/Y2018/V13/I3/376
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