空调翅片的翻边孔多道次成形模拟

Simulation on multi-step hole-flanging for air-conditioning fins

由于采用薄铝箔制造的空调翅片在成形过程中翻边孔孔壁容易出现破裂,且成形道次多通过经验确定,难以合理调整加工参数。采用有限元仿真方法,重现翻边孔的成形过程,分析缺陷的形成原因。建立了铝翅片多道次成形仿真模型,模拟了鼓包拉深工序、冲孔拉深工序和二次翻边工序的过程,并与实际铝翅片的翻边孔进行对比,验证了仿真结果的准确性,最后基于仿真结果探讨板料与模具之间的摩擦系数对成形结果的影响。实验表明,摩擦系数的改变会影响翻边孔成形中的厚度分布、最大减薄率以及翻边孔的成形质量。

The air-conditioning fins produced by thin aluminum foils are prone to fracture at hole wall during the hole-flanging, and forming steps are confirmed by experience, so the process parameters are hard to adjust reasonably. Therefore, the process of hole-flanging was simulated by FEA, and the cause of fracture was analyzed. Then, a multi-step hole-flanging model was set up, and drawing, piercingdrawing and twice flanges were simulated. Next, a simulation result was contrasted with real fins and verified. At last, the influences of friction coefficient between die and sheet on multi-step hole-flanging were elaborated according to the simulation result. The resuh indicates that different friction coefficients can affect the thickness distribution, the maximum thinning ratio and forming quality in the hole-flanging process.