摘要
为了准确测定玻璃润滑涂层的摩擦因数,通过分析圆环镦粗变形理论,修改传统DEFORM-3D有限元模型并完成TC4钛合金圆环镦粗正交数值模拟,得到3种摩擦因数标定曲线。对比分析了理论解析、传统有限元模型和改进有限元模型数值模拟所得3种摩擦因数标定曲线的差异性和分散度。研究了坯料温度、模具温度、镦粗速度和热传导系数工艺参数对摩擦因数标定曲线的影响。采用圆环镦粗实验,结合改进模型摩擦因数标定曲线测定了TC4钛合金在不同摩擦条件下的摩擦因数。结果表明:3种摩擦因数标定曲线存在明显差异,改进模型数值模拟所得标定曲线有较好的分散度;镦粗速度对摩擦因数标定曲线的影响最大,其他依次是坯料温度、热传导系数和模具温度。TC4钛合金圆环在坯料温度950℃、模具温度400℃和镦粗速度5 mm·s^(-1)条件下镦粗时,干摩擦、自制玻璃涂层和Ti-1玻璃涂层润滑的摩擦因数分别为0.64、0.23和0.20。改进模型摩擦因数标定曲线充分考虑了成形工艺参数的影响,更接近TC4钛合金热成形实际过程,通过圆环镦粗实验验证了改进模型模拟结果的准确性和可靠性。
To accurately measure the friction coefficient of the glass lubricating coating,by analyzing the deformation theory of ring upsetting,modifying the traditional DEFORM-3 D finite element model and completing the orthogonal numerical simulation of TC4 titanium alloy ring upsetting,three calibration curves of friction coefficients were obtained.The difference and dispersion of friction coefficient calibration curves obtained by theoretical analysis,traditional finite element model and numerical simulation of improved finite element model were compared and analyzed.The influence of parameters such as billet temperature,die temperature,upsetting speed and thermal conductivity on the friction coefficient calibration curve was studied.The friction coefficients of TC4 titanium alloy under different friction conditions were measured by ring upsetting experiment combined with friction coefficient calibration curve of the improved model.The results show that there are obvious differences between the three kinds of friction coefficient calibration curves.The calibration curve obtained by the numerical simulation of improved finite element model has better dispersion.The upsetting speed has the greatest influence on the friction coefficient calibration curve,followed by the billet temperature,thermal conductivity and die temperature.When TC4 titanium alloy is upset at billet temperature of 950 ℃,die temperature of 400 ℃ and upsetting speed of 5 mm·s^(-1),the friction coefficients of dry friction,self-made glass coating and Ti-1 glass coating are 0.64,0.23 and 0.20,respectively.The influence of forming process parameters is fully considered in the friction coefficient calibration curve of the improved model,which is closer to the actual hot forming process of TC4 titanium alloy.The accuracy and reliability of the simulation results of the improved model is verified by ring upsetting experiments.
作者
肖良红
陆东
艾自祯
汪宇
XIAO Liang-hong;LU Dong;AI Zi-zhen;WANG Yu(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China;Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education,Xiangtan University,Xiangtan 411105,China;Key Laboratory of Welding Robot and Application Technology of Hunan Province,Xiangtan University,Xiangtan 411105,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2022年第1期196-203,共8页
Journal of Plasticity Engineering
基金
湘潭大学博士启动基金资助项目(12QDZ17)。
关键词
TC4钛合金
玻璃润滑涂层
摩擦因数标定曲线
圆环镦粗实验
有限元数值模拟
TC4 titanium alloy
glass lubricating coating
friction coefficient calibration curve
ring upsetting experiment
finite element numerical simulation
