基于变形本质特征的锥形凹模缩口工艺关键参数影响分析与凹模半锥角优化  

Influence analysis on key parameters in necking process with conical die and optimum on semi-cone angle of die based on essential deformation characteristics

作　　者：褚亮 宫小龙 吴静然 韩彦龙 王锋 汤立松 Chu Liang;Gong Xiaolong;Wu Jingran;Han Yanlong;Wang Feng;Tang Lisong(Department of Mechanical Engineering,Hebei Petroleum University of Technology,Chengde 067000,China;Department of Thermal Engineering,Hebei Petroleum University of Technology,Chengde 067000,China)

机构地区：[1]河北石油职业技术大学机械工程系,河北承德067000 [2]河北石油职业技术大学热能工程系,河北承德067000

出　　处：《锻压技术》2024年第11期47-54,共8页Forging & Stamping Technology

基　　金：承德市应用技术研究与开发暨可持续发展议程创新示范区专项科技计划项目(202305B066)

摘　　要：依据锥形凹模缩口工艺的变形特点,分析了锥形变形区和自由弯曲区的力学特征,采用主应力法,结合材料变厚和加工硬化两个影响因素,研究了锥形凹模缩口变形过程中径向应力和切向应力的变化规律并推导出具体的理论表达式。分析了缩口系数、摩擦因数、凹模半锥角对最大径向应力和缩口变形力的影响。研究表明,最大径向应力和缩口变形力随着缩口系数的增大而单调递减,随着摩擦因数的增加而线性递增,而与凹模半锥角呈凹曲线关系,存在最佳凹模半锥角。在此基础上,理论推导出了摩擦因数与最佳凹模半锥角的函数关系式,进一步分析了最佳凹模半锥角与摩擦因数之间的关系,并通过对理论数据进行拟合建立了最佳凹模半锥角的数学表达式。According to the deformation characteristics of necking process with conical die,the mechanical characteristics of conical deformation zone and free bending zone were analyzed,and combined with two influence factors of material thickening and work hardening,the variation laws of radial stress and tangential stress in the necking deformation process with conical die were studied by principal stress method.Then,the specific theoretical expressions were derived,and the influences of necking coefficient,friction factor and semi-cone angle of die on the maximum radial stress and the necking deformation force were analyzed.The research shows that the maximum radial stress and the necking deformation force monotonically decrease with the increasing of necking coefficient,linearly increase with the increasing of friction factor,and exhibit a concave curve relationship with semi-cone angle of die,indicating the existence of an optimal semi-cone angle of die.On this basis,a functional relationship between friction factor and optimal semi-cone angle of die is theoretically derived,and the relationship between optimal semi-cone angle of die and friction factor is further analyzed.The mathematical expression of optimal semi-cone angle of die is established by fitting the theoretical data.

关 键 词：缩口变形力 径向应力 凹模半锥角 摩擦因数 缩口系数 

分 类 号：TG386[金属学及工艺—金属压力加工]