摘要
切削加工过程中材料内部残余应力是影响加工质量的关键因素之一,在虚拟环境实现应力场演化过程的可视化能有效监测其演化规律,有助于提高零件加工质量。为实现应力场在虚拟环境的实时映射,依据数字孪生技术开发了一种装夹应力场实时映射方法。首先,阐明了切削加工系统数字孪生层级。然后,提出了加工过程残余应力场在虚拟环境的映射方案,具体为:基于有限元仿真方法,采用RBF神经网络建立了应力场仿真近似模型;以孪生几何模型为载体,采用数据驱动方法实现了近似模型仿真结果在虚拟环境的映射。最后,以工件装夹残余应力场分布情况为例进行验证。结果表明,近似模型实时仿真结果与有限元仿真结果的最大偏差为7.7%,验证了该应力场虚拟映射方法的可行性与有效性,为切削加工过程数字孪生提供了技术支撑。
The residual stress of parts is one of the critical factors affecting the machining quality during the cutting process.Visualizing the evolution process of residual stress field in virtual environment can effectively monitor its evolution law,which helps to improve the machining quality of parts.In order to achieve real-time mapping of stress field in virtual environment,a real-time mapping method for stress field in clamping was developed based on digital twin technology.Firstly,the overall architecture of the digital twin in the cutting process was elucidated.Secondly,a mapping scheme for the residual stress field during the machining process in a virtual environment was proposed.Specifically,based on the finite element simulation method,an approximate model for the simulation of residual stress during clamping was established using RBF neural networks;The data-driven method was used to achieve the mapping of approximate model simulation results in a virtual environment.Finally,taking the distribution of residual stress field during workpiece clamping as an example for verification,the maximum deviation between the real-time simulation results of the approximate model and the finite element simulation results is 7.7%,which verifies the feasibility and effectiveness of the real-time mapping method for stress field.In general,this method provided the technical support for digital twin in the cutting process.
作者
王禹封
赵正彩
苏宏华
陈燕
徐宝德
WANG Yufeng;ZHAO Zhengcai;SU Honghua;CHEN Yan;XU Baode(Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;Beijing Xinghang Electro-Mechanical Equipment Co.,Ltd.,Beijing 100071,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第21期67-73,共7页
Aeronautical Manufacturing Technology
基金
国家自然科学基金(92160301)。
关键词
数字孪生
切削加工
装夹
残余应力场
近似模型
数据驱动
Digital twin
Cutting process
Clamping
Residual stress field
Approximate model
Data driven
