镍基合金GH625管材用挤压模设计与应用  

Design and application of extrusion die used in nickel based alloy GH625 tube

作　　者：拓雷锋[1,2] 李志春 周根树 楚志兵[3] 李强[2] Tuo Leifeng;Li Zhichun;Zhou Genshu;Chu Zhibing;Li qiang(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China;Shanxi Taigang Stainless Steel Pipe &Tube Co.,Ltd.,Taiyuan 030008,China;School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]山西太钢不锈钢钢管有限公司,山西太原030008 [3]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《锻压技术》2018年第12期109-116,共8页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(U1710113)

摘　　要：采用FEM方法,对高温镍基合金GH625管材的平模和锥模两种不同挤压工艺进行模拟,分析了应力和应变分布特点。在挤出管材的壁厚方向上取5个点追踪应力、应变、应变速率和金属流动速率的变化规律,通过应变变化规律分析管材壁厚方向上的分层缺陷,对比平模和锥模两种不同模型设计对挤压载荷的影响。结果表明,锥模有利于降低挤压力和减小挤压过程中壁厚方向上的金属流速差。采用60 MN卧式挤压机进行平模和锥模两种不同挤压模设计的实际挤压生产试验,验证了模拟分析结果的正确性,锥模可以解决GH625管材壁厚方向上的分层。Two different extrusion processes with fiat die and cone die for nickel based alloy GH625 tube at high temperature were simulated by FEM method,and the stress and strain distribution characteristics were analyzed.Then,five points in the direction of wall thickness of extruded tube were selected to track the changes of stress,strain,strain rate and metal flow rate,and the lamination defects in the direction of wall thickness of tube were analyzed by the strain change law.The influences of different pattern designs of flat die and cone die on the extrusion loads were compared.The result shows that the cone die is good for reducing extrusion force and decreasing the difference of metal flow rate in the direction of wall thickness of tube during extrusion process.The actual extrusion tests with flat die and cone die were conducted by 60MN horizontal extruder.Furthermore,the simulation results were well verified by the production test results,and the lamination in the direction of wall thickness of GH625 tube was solved by the extrusion with cone die.

关 键 词：镍基合金 GH625 热挤压 平模 锥模 管材 

分 类 号：TG372[金属学及工艺—金属压力加工]