Transactions of Materials and Heat Treatment

Title：Flexible and rigid coupling technology on rubber forming for variable curvature double surround deep ribs reinforcing skin

Authors： Bai Ying Si Jixiang Meng Wenbo Wang Yongxing Li Shifeng Zhang Li

Unit： AVIC Xi’an Aircraft Industry Group Co. Ltd.

KeyWords： rubber forming reinforcing skin reinforcing rib rigid and flexible coupling forming pressure

ClassificationCode：TG386

year,vol(issue):pagenumber：2022,47(10):124-132

Abstract：

The reinforcing skin with variable curvature double surround deep ribs has thin material, low forming limit and large reinforcing rib depth, its traditional rubber forming at one time is not feasible by bulging theory analysis. Therefore, based on the conclusion analysis of equivalent stress nephogram and material thickness change nephogram of reinforcing skin by PAM-STAMP 2G rubber one-time forming, the design structure of flexible medium tooling for instability suppression and the defect control scheme of multi-pass rubber forming were determined. The combination tooling of the forming die with convex curvature rib shape and the long rubber plates was used for multi-pass rubber aggregated forming, and the combination tooling of the sizing die with concave curvature rib shape and the eyeglass frame rubber block was used for multi-pass rubber forming of buckling correction, which were tested by experiment. The results show that the orderly filling of rubber plates can realize controllable material storage, and the use of hollow flexible rubber block can realize embedded pressure-expansion sizing, which reduces the buckling deformation and springback of reinforcing skin. Thus, the multi-pass rubber forming with rigid and flexible coupling combined tooling structure can improve the height limit of the traditional rubber forming deep rib structure.

Funds：

白颖（1972-），女，学士，研究员级高工,E-mail：baiyingsyh@163.com

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