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| Research on Control Method of Surface Groove of Titanium Alloy SPF/DB Four-Sheet Structure |
| LI Baoyong 1, 2 , ZHANG Tiejun2 , ZHANG Kaifeng 1 , YAO Wei2 , QIN Zhonghuan2 , LIU Qi2 , LIU Wei2 |
| (1. School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, China； 2. Beijing Hangxing Machine Manufacturing Co., Ltd., Beijing 100013, China) |
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Abstract In this paper, through the combination of the finite element numerical simulation and the actual test, the causes of the surface groove formation of superplastic forming/diffusion bonding (SPF/DB) four-sheet structure are analyzed and studied. The orthogonal test method is used to analyze the influence of four factors on the surface groove of the panel, including the strain rate έ, the diffusion connection width b, the thickness ratio t of the core plate to the panel and the friction coefficient u of the die. It can be seen that the thickness ratio t of the core plate to the panel is the most important factor of the surface groove of the panel. Based on the experimental study, a method of pressing 0.2MPa back pressure on the panel surface is proposed, which can effectively control the formation of the surface groove of SPF/DB four-sheet structure.
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2020, 
