高强螺纹滚压工艺的有限元模拟及试验研究  

Numerical and Experiment Study of Cold Rolling Processing for High-strength Thread

作　　者：程明龙 贾延奎[1] 张德远[2] 

机构地区：[1]北京航天发射技术研究所 [2]北京航空航天大学

出　　处：《工具技术》2017年第5期18-22,共5页Tool Engineering

摘　　要：对高强螺纹进行滚压处理可有效提高螺纹结构的抗疲劳性能。为深入研究螺纹滚压工艺规律,以提高螺纹紧固件的抗疲劳性能,建立螺纹滚压工艺三维有限元模型,并基于该模型研究了滚轮参数对滚压后残余应力的影响规律,最终采用疲劳试验验证了该方法的有效性。结果表明:滚轮型面夹角、直径、型面圆弧半径等参数对滚压后引入的残余应力分布具有很大影响。滚轮型面夹角越小,滚压后引入的残余压应力层越深;较小的滚轮直径有利于引入较大的残余压应力和残余应力层深;较大的圆弧半径可获得较高的表面残余压应力和最大残余压应力,同时在一定范围内导致残余应力层深减小。疲劳试验结果表明,采用未经优化的滚轮强化后,螺纹疲劳寿命提高1.6倍,而采用经优化设计的滚压轮强化后,螺纹疲劳寿命提高4倍。该结果证实了基于有限元分析的滚轮优化方法的有效性。The fatigue performance of high-strength thread could be significantly improved by surface rolling. In order to fully investigate the thread root rolling process （TRRP） and then further improve the anti-fatigue performance of high strength thread, a 3D finite element model （3 D-FEM） of thread root rolling process was built using ABAQUS. The effect of roller parameters on distribution of residual stress induce by TRRP was then studied with the developed 3D-FEM. An opti- mum design method of roller was first proposed based on the residual stress,whose effectiveness was well confirmed by fa- tigue tests. Results show that the profile angle, diameter and profile radius of roller have great impacts on distribution of re- sidual stress. Larger depth of residual stress can be obtained when smaller profile angle is adopted, while both larger residu- al depth and surface residual stress can be generated by using a roller with small diameter. Higher surface residual stress and maximum of residuals stress can also be realized by using a roller with larger profile radius. An fatigue life increase of 1.6 times is obtained for specimens treated by common roller, while 4 times is got for the specimens treated by optimized roller, which demonstrates that the optimum design method of roller based on residuals stress is effective.

关 键 词：螺纹滚压 有限元分析 残余应力 疲劳性能 高强度钢 

分 类 号：TG722[金属学及工艺—刀具与模具] TH140.1[一般工业技术—材料科学与工程]