铝合金薄壁异形截面辗扩成形宏微观模拟

Macro-and Microscopic Simulation of Ring Rolling for Aluminum Alloy Thin-walled Special-shaped Section Ring

环件轧制作为一种无缝环筒类构件先进塑性成形技术,目前还难以实现铝合金薄壁带筋锥筒构件的近净成形制造。针对2A14铝合金薄壁异形截面环件,建立其辗扩成形宏微观耦合分析有限元模型,选用矩形截面环件作为坯料,基于有限元模拟获得了优化后的轧制孔型,并探究坯料初始温度及芯辊进给速度对材料成形性和微观组织演变的影响规律,得到微观组织均匀且孔型填充性良好的辗环工艺参数。环坯温度为470℃,芯辊进给速度为1.2 mm/s,主辊旋转转速为30 r/min,上锥辊的压下速度为0.6 mm/s为最优工艺参数,能够满足2A14铝合金异形截面辗扩形/性控制要求,可为实际生产提供理论指导。

As an advanced plastic forming technology for seamless rings, ring rolling is difficult to realize the near-net shaping of thin-walled conical aluminum alloy rings with inner ribs. For 2A14 aluminum alloy ring with thin-walled special shaped section, a coupled macro-micro finite element model of the ring rolling is developed. The ring with rectangular section is selected as the billet, the optimized roll shape is obtained by the finite element simulation. The effects of deformation temperature and feeding speed of mandrel on the formability and microstructure evolution of ring are investigated, which can obtain the ring rolling process parameters with uniform microstructure and good filling. The optimum process parameters are that the billet temperature is 470℃, the feeding speed of the mandrel is 1.2 mm/s, the king roll rotation speed is 30 rpm, and the speed of the upper cone roll is 0.6 mm/s, which supply the theoretical guidance for the actual manufacturing.