挤压温度和速度对6063铝型材组织条纹的影响

Effect of extrusion temperature and speed on structure stripe of 6063 aluminum profiles

通过组织分析和表面质量观察,研究了挤压温度和速度两个工艺参数对铝型材组织条纹的影响.结果表明:当挤压速度超过12m/min后组织条纹缺陷加重,当挤压速度达到17m/min时组织条纹缺陷更明显;挤压温度过低会使挤压过程中动态再结晶晶粒大小不一致,分布不均匀,从而使组织条纹缺陷程度加深.挤压温度过高或挤压速度过快均会导致壁厚变化部位金属流动的不均匀,引发其组织分布不均匀,从而使组织条纹缺陷明显.挤压温度和挤压速度分别在490℃,12m/min左右较合适.

The effects of extrusion temperature and speed on structure stripe of aluminum profiles are investigated by analysis of microstructure and inspection of surface quality of the profiles. The results show that when the extrusion speed is over 12m/min, the defect of structure strip will deepen. When the extrusion speed is 17m/min, the defect is more visible. Too low extrusion temperature leads to non-uniform size and distribution of dynamic recrystallization grains, thus deepening the defect of structure strip. Too high extrusion temperature or speed results in inhomogeneity of the metal flow at the part where wall thickness changes, causing the non-uniformity of structure distribution and deepening the defect of structure strip. The best condition is when the extrusion temperature is at 490 ℃ and speed at 12m/min