摘要
研究目的:为研究降低50AT尖轨淬火后残余应力的振动时效参数,本文通过建立道岔直线尖轨有限元分析模型,使用Deform软件模拟出尖轨淬火后的残余应力分布,结合尖轨模态响应得到振动时效参数,并通过盲孔测应力评价方法对比分析模态时效参数与企业时效参数对尖轨振动时效后残余应力的消除效果,最终得到适合降低50AT尖轨残余应力的振动时效参数。研究结论:(1)尖轨轨头中频感应淬火完成后,尖轨轨头、轨腰分布着残余压应力,轨底分布着残余拉应力;(2)基于尖轨淬火后轨底中部残余应力集中、翘曲变形特性,以及尖轨的模态振型,得到支撑点位置、激振点位置及激振频率等振动时效参数;(3)采用本文得到的时效参数对尖轨进行振动时效处理,残余应力的平均消除比率为46.6%;按照企业时效参数对尖轨进行振动时效处理,残余应力的平均消除比率为28.8%;本文时效参数下对残余应力的平均消除率是企业现有时效参数下的1.6倍,且时效时间仅为企业时效时间的1/4,可显著提高生产效率;(4)本文得到的振动时效参数可用于指导50AT尖轨感应淬火后残余应力的降低。
Research purposes:In order to reduce the residual stress of 50AT rail after quenching,the finite element analysis model of turnout linear rail was established.The residual stress distribution after quenching was simulated by Deform software,and the vibration aging parameters were obtained by combining the modal response of the rail.Through the blind hole stress measurement evaluation method,the effect of modal aging parameters and enterprise aging parameters on eliminating residual stress after vibration aging of pointed rail was compared and analyzed.Finally,the vibration aging parameters suitable for reducing the residual stress of 50 AT pointed rail are obtained.Research conclusions:(1)After the intermediate frequency induction hardening of the pointed rail head is completed,the residual compressive stress distributes in the pointed rail head and waist,and the residual tensile stress distributes in the rail bottom.(2)Based on the characteristics of residual stress concentration,warping and deformation in the middle of the rail bottom after quenching,and the modal mode of the rail,the vibration aging parameters such as the position of support point,the position of excitation point and the frequency of excitation are obtained.(3)Using the aging parameters obtained in this paper,the average elimination ratio of residual stress is 46.6%.The average elimination ratio of residual stress is 28.8%according to the aging rule of the enterprise.The average elimination rate of residual stress under the aging parameters is 1.6 times of the existing aging parameters of the enterprise,and the aging time is only 1/4 of the enterprise aging time,which can significantly improve the production efficiency.(4)The parameters obtained in this paper can be used to guide the reduction of residual stress of 50 AT rail after induction quenching.
作者
徐金辉
程毅
冯青松
张斌
邹小魁
XU Jinhui;CHENG Yi;FENG Qingsong;ZHANG Bin;ZOU Xiaokui(East China Jiaotong University,Nanchang,Jiangxi 330013,China;Hubei Wutieshanqiao Track Equipment C o.,Ltd.,Macheng,Hubei 438300,China)
出处
《铁道工程学报》
EI
北大核心
2019年第11期18-22,29,共6页
Journal of Railway Engineering Society
基金
国家自然科学基金青年科学基金项目(51808221)
江西省教育厅科学技术研究项目(GJJ170394)
关键词
尖轨
电磁感应淬火
残余应力
振动时效
pointed rail
electromagnetic induction quenching
residual stress
vibration aging
