在线氮气冷却技术的等温挤压工艺与系统研究

The research on isothtermal extrusion process using liquid N_2 to cool in real-time

介绍了铝合金型材挤压过程中氮气冷却系统的工作原理.采用氮气冷却后,挤压速度由23 m/min提高到35 m/min,型材的温度仍然保持恒定,并降低了型材表面的粗糙度.经氮气冷却处理后,型材组织的晶粒度和试件的硬度分布更加均匀.在铝合金型材挤压过程中采用在线氮气冷却技术,有助于改善提高挤压速度对型材质量造成的不良影响.

This article explains the principal of the N2-cooling technology during the aluminum extrusion process- ing. When using liquid N2 to cool, the speed of extrusion increased from 23m/min to 35m/min, while the die temperature remained constant with the roughness of the extrusion profile being improved. The grain size in the struc- ture of extruded section was well-distributed and the hardness of the extrusion profile was uniform. The method of isothtermal extrusion process using liquid N2 to cool in real-time contribute to improve the extrusion profile quality with high-speed extrusion.