锻压技术

镍基合金GH625管材用挤压模设计与应用

英文标题：Design and application of extrusion die used in nickel based alloy GH625 tube

单位：1.西安交通大学金属材料强度国家重点实验室 2.山西太钢不锈钢钢管有限公司 3.太原科技大学材料科学与工程学院

关键词：镍基合金 GH625 热挤压平模锥模管材

分类号：TG372

出版年,卷(期):页码：2018,43(12):104-108

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 flat 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 60 MN 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.

基金项目：

基金项目:国家自然科学基金资助项目(U1710113)

作者简介：拓雷锋（1984-），男，博士研究生 Email：tuochaofeng@163.com 通讯作者：周根树（1964-），男，博士，教授 Email：zhougenshuxjtu@163.com

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