锻压技术

GH4169高温合金螺栓热锻成形工艺

英文标题：Hot forging process on superalloy GH4169 bolt

单位：1.安徽天航机电有限公司 2.南京航空航天大学机电学院 3.国营芜湖机械厂

分类号：

出版年,卷(期):页码：2022,47(3):8-22

摘要：

高温合金热锻成形过程具有热力耦合和多参数交互特征，其温度场及应力、应变场的分布和演变复杂，实验前需通过数值分析获得较优的工艺参数。以GH4169高温合金螺栓为研究对象，对螺栓单道次及多道次热锻成形工艺进行对比、分析，研究了头部初始热锻温度、下压速率、摩擦因数、换热系数和模具预热温度等工艺参数对锻件热锻压力、应变均匀性的影响规律。结果表明：单道次热锻无法成形出目标螺栓零件，需采用多道次热锻成形工艺；热锻压力随头部初始热锻温度增大而减小，随摩擦因数增大而增大，随下压速率增大而增大；应变均匀性在头部初始热锻温度较高或摩擦因数较小时更好。最后，获得了GH4169高温合金螺栓的优化的热锻工艺参数，并通过热锻实验，获得了性能优良的零件。

The hot forging process of superalloy has the characteristics of thermal-mechanical coupling and multi-parameter interaction, and the distribution and evolution of temperature field and stress-strain field are complex. It is necessary to obtain optimal process parameters by numerical analysis before the test. Therefore, for superalloy GH4169 bolt, the single-pass and multi-pass hot forging processes of bolt were compared and analyzed, and the influence laws of process parameters such as initial hot forging temperature for head, pressing rate, friction coefficient, heat transfer coefficient and die pre-heating temperature on hot forging pressure and strain uniformity of forgings were studied. The results show that the target bolt part cannot be formed by the single-pass hot forging, and the multi-pass hot forging is required. The hot forging pressure decreases with the increasing of initial hot forging temperature for head and increases with the increasing of friction coefficient and pressing rate. The strain uniformity is better when the initial hot forging temperature of head is higher or the friction coefficient is smaller. Finally, the optimized process parameters of hot forging for superalloy GH4169 bolt were obtained, and the parts with excellent performance were obtained through hot forging test.

基金项目：

江苏省自然科学基金资助项目（BK20170785）

作者简介：方军（1975-），男，学士，高级工程师 E-mail：fangjun1212@sohu.com 通信作者：张涛（1989-），男，博士，讲师 E-mail：297zhangtao@nuaa.edu.cn

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