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分析了电加工对铝型材挤压模具工作带表面组织、应力状态的影响.提出了在电加工后进行低温处理的工艺,以延长挤压模具的使用寿命.“,”The work-surface of extrusion die after EDM is analysed. The stress andstructure of the EDM layer are studied. The working life of the extrusion die is improvedby low temprature treatment process.