多辊下压式柔性拉形工艺及其数值模拟

Technology and numerical simulation of multi-roll-pressing stretch forming process

研究了一种新型的柔性拉形工艺——多辊下压式柔性拉形(MRPFSF)。采用动态显式有限元软件,对2024-O铝合金板材使用传统拉形工艺和MRPFSF工艺时成形球面件的过程进行了仿真,对比分析拉形过程中板材的应力、应变和板材厚度变化。仿真结果表明,与传统拉形工艺相比,使用MRPFSF工艺时得到的拉形件应力应变分布均匀,成形效果更好。最后用实验机进行了实验验证,结果证明了MRPFSF工艺的可行性与实用性。

A new kind of stretch forming process, called multi-roll-pressing flexible stretch forming （MRPFSF） process, was studied. The MRPFSF process of spherical surface parts of aluminum alloy sheet was simulated in comparison with the conventional process by means of an explicit finite element software and the variations of stress, strain, and thickness of forming parts were analyzed comparatively for both forming modes. The results show that the stress and strain distributions in the forming part by MRPFSF are more uniform and the forming quality is better than those by the conventional process. The practical MRPFSF test was done on an experimental machine, proving the feasibility and practicability of the proposed MRPFSF process.