利用固有频率变化评估铸铁件去应力效果的研究  

Study on the evaluation of stress relieving effect of cast iron parts by using the variation of intrinsic frequency

作　　者：李文威 曹帅[3] 刁子健 陈雪凌 LI Wenwei;CAO Shuai;DIAO Zijian;CHEN Xueling(South China Robotics Innovation Research Institute,Foshan 528300,Guangdong China;Foshan Zhiyouren Technology Co.,Ltd.,Foshan 528300,Guangdong China;Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,Yunnan China;Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650504,Yunnan China)

机构地区：[1]华南智能机器人创新研究院,广东佛山528300 [2]佛山智优人科技有限公司,广东佛山528300 [3]昆明理工大学信息工程与自动化学院,云南昆明650500 [4]昆明理工大学机电工程学院,云南昆明650504

出　　处：《中国铸造装备与技术》2024年第4期91-96,共6页China Foundry Machinery & Technology

基　　金：佛山市重点领域“揭榜挂帅”科技攻关项目(2120001009232);佛山市科技创新团队项目(FS0AA-KJ919-4402-0060)。

摘　　要：为了简化铸铁件去应力效果的评价过程,以梳棉机盖板铸件为研究对象,从理论推导、虚拟仿真、试件测试三个角度对铸铁件的固有频率、残余应力及两者关系进行了研究。首先,推导了等截面梁形铸铁件固有频率与其残余应力关系的理论公式;其次,利用ANSYS和ProCAST软件分别对梳棉机盖板进行有限元模态分析和铸造残余应力分析;再次,对一组不同应力状态的梳棉机盖板试件,分别利用试验模态分析法和X射线衍射应力测量法测定其各阶固有频率和残余应力;最后,推导了利用固有频率计算铸铁件残余应力降低量的理论公式,并对实验数据进行线性最小二乘拟合。结果表明,等截面梁型铸铁件的残余应力与其一阶弯曲固有频率的平方成线性关系,利用这种线性关系可对铸铁件的去应力效果进行评估。In order to simplify the evaluation process of the stress relief effect of iron castings,the natural frequency,residual stress and the relationship between the natural frequency and residual stress of iron castings were studied from three perspectives:theoretical derivation,virtual simulation and specimen testing.Firstly,the theoretical formula of the relationship between the natural frequency and the residual stress of the beam castings of equal cross-section is derived.Secondly,ANSYS and ProCAST software were used to analyze the finite element mode and casting residual stress of the carding machine cover respectively.Thirdly,a group of carding machine cover specimens with different stress states were determined by experimental modal analysis and X-ray diffraction stress measurement method.Finally,the theoretical formula of calculating the residual stress reduction of iron castings by natural frequency is derived,and the experimental data are fitted by linear least squares.The results show that the residual stress of the iron castings with equal cross-section beam is linearly related to the square of the natural frequency of the first-order bending,and the stress relief effect of the castings can be evaluated by using this linear relationship.

关 键 词：铸铁 残余应力 固有频率 去应力 

分 类 号：TG25[金属学及工艺—铸造]