铝材长方形空心管挤压过程数值模拟与模具结构优化设计

对AA1100铝材长方形空心管的挤压过程使用数值分析软件SuperForge进行数值模拟。在挤压生产中,金属流出工作带时的流速均匀性是得到高质量型材的关键。在挤压生产中通常采用几种方法修改模具,消除流速不均,例如修改分流孔的大小、形状和位置分布,修改工作带长度和焊合室形状尺寸等。本文通过数值模拟发现在长方形空心管挤压的初始模具设计中型材截面流速不均匀,造成端面不平。对此,提出了三种模具修改方案,并分别对其进行了数值模拟,经过分析比较确定了最佳模具设计方案,由此方案可以生产出合格的挤压件。

Numerical Simulation and Die Structure Optimization of an Aluminum Rectangular Hollow Pipe Extrusion Process

An aluminum rectangular hollow profile extrusion process was simulated by using numerical analysis software SuperForge.The uniform material flow velocity in the section of bearing exit is extremely important for getting a high quality product.In general,several die modification methods were chosen to eliminate uneven velocity distribution in the section of bearing exit,such as adjustment of the size,shape and location of portholes,modification of the bearing length and seaming chamber shape.It is found that the flow velocity of the rectangle hollow profile through an original die design is non-uniform and the forepart of the profile is not neat or even.Aiming to solving this problem,three die structure modification schemes were proposed.The extrusion processes for three die structure schemes were simulated,and the optimal die design was determined through comparing the simulation results of the three die design schemes.A sound extrusion workpiece was produced by using the optimal die design.