针对铝型材热挤压模具的断裂问题进行了失效原因分析及工艺分析 .利用回归正交设计法安排了 8组工艺实验 ,测试了钢材的断裂韧性 (KIC) ,冲击韧性及其硬度 ,并建立了上述指标与主要热处理工艺参数间的数学表达式 .在此基础上 ,对现行的生产工艺进行了改进 ,消除了热挤压模具的早期断裂 ,并使其使用寿命显著提高 . Failure analysis and process analysis of aluminum alloy hot extrusion die were carried out.Using regression orthogonal design method, eight groups of technological experiments were arranged to test the fracture toughness (KIC), impact toughness and hardness of the steel and establish Based on this, the existing production process is improved, the early fracture of the hot extrusion die is eliminated, and the service life of the hot extrusion die is remarkably improved.