【摘要】 简要介绍了液氮冷却模具技术的基本原理以及常用的冷却通道布置方法。通过收集现场生产试验数据,分析了铝型材挤压过程中液氮冷却模具技术对模具温度、挤压速度、出料口型材温度及其表面光洁度的影响。结果表明:采用对模垫的液氮冷却技术是可行的;液氮开度值设定为70%时,模具温度显著下降,挤压速度最高提速可达37.5%,出料口型材降温幅度达到最大4.6%,型材表面光洁度明显提高;采用液氮冷却模具技术,大大提高了铝型材生产效率和表面质量。更多还原

【Abstract】 The basic principle of liquid nitrogen cooling of extrusion die and the distribution of liquid nitrogen passing channels has been introduced.The experiment parameters of the liquid nitrogen cooling die collected at extrusion production line have been introduced.The effect of nitrogen cooling on die temperature,extrusion speed,temperature of profile at die exit and profile surface finish has been analyzed.The experiment result shows that liquid nitrogen die cooling is feasible.The die temperature decreased obviously,extrusion speed can be increased maximum to 37.5%,profile temperature at die exit can be decreased maximum to 4.6% and the finish quality of the profile can be increased obviously at the condition of 70% opening of liquid nitrogen nozzle.更多还原