锻压技术

基于数值模拟的TC4钛合金航空叶片精锻过程的金属流动规律

英文标题：Flow law of metal in precision forging for TC4 titanium alloy aeronautical blade based on numerical simulation

作者：吴捍疆张丰收燕根鹏

关键词：航空发动机叶片 TC4钛合金精锻成形金属流动 Simufact.Forming

分类号：X263.5; V263.1

出版年,卷(期):页码：2019,44(2):7-14

摘要：

利用Simufact.Forming软件对TC4钛合金叶片的精锻过程进行了数值模拟研究，分析了叶片成形后其等效应力场、等效应变场、温度场的分布情况，研究了不同坯料温度、模具温度、上模速度、摩擦系数等工艺参数对叶片表层金属流动的影响。研究结果表明：叶片周围的毛边区域等效应力较小、等效应变较大、温度较高；最大等效应力点易出现在靠近叶尖的叶身头部、榫头与叶身的连接处、榫头头部及尾部区域；榫头区域的等效应变和温度最低，叶身中部区域的等效应变和温度较高；叶片各区域的Z方向速度方向一致，而叶尖与叶身中部之间区域的X、Y方向速度则出现正、反两个方向的变化，易导致折叠缺陷。叶片榫头区域的金属流动速度受工艺参数影响较小，其流动速度较为缓慢，接近于0；而叶身与榫头连接处附近区域的金属流动速度受工艺参数影响较大，提高坯料温度、上模速度、摩擦系数，都可使其金属流动速度增大，而模具温度的升高则会导致金属流动速度的减小。

The precision forging process of TC4 titanium alloy blade was simulated by software Simufact.Forming, and the distributions of equivalent stress field, equivalent strain field and temperature field after blade forming were analyzed. Then, the influences of different process parameters such as billet temperature, mold temperature, upper mold speed and friction coefficient on the metal flow of blade surface were studied. The results show that the equivalent stress in the burr area around the blade is smaller, the equivalent strain is greater, and the temperature is higher. Then, the maximum equivalent stress point is easy to appear in the head of blade body near the blade tip, the joint of tenon and blade body and the head and tail areas of tenon. However, the equivalent strain and the temperature in the tenon region are the lowest, and the equivalent strain and the temperature in the middle region of blade body are higher. Furthermore, the velocities along the Z direction in each area of the blade are consistent, while the velocities along the X and Y directions in the area between the blade tip and the middle of blade body change in both forward and reverse directions to cause folding defects easily. In addition, the velocity of metal flow in the tenon area of blade is less affected by the process parameters, its flow velocity is relatively slow to close to zero, and the velocity of metal flow near the joint of blade body and tenon is greatly affected by the process parameters. Thus, the velocity of metal flow increases with the increasing of billet temperature, upper mold speed and friction coefficient, and the increase of mold temperature leads to the decrease of the velocity of metal flow.

基金项目：

国家自然科学基金资助项目（51475146，51475366）

吴捍疆（1992-），男，硕士研究生，E-mail：764649866@qq.com；通讯作者：张丰收（1972-），男，博士，教授，E-mail：fengshouzhang@163.com

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