振动拉拔的非局部摩擦问题的近似求解及表面效应初探  

NON-LOCAL FRICTION SURFACE EFFECT AND APPROXIMATE SOLUTION OF DRAWING DEFORMATION WITH VIBRATION

作　　者：蔡改贫[1] 翁海珊[1] 姜志宏 罗小燕 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]江南理工大学机电工程学院,赣州341000

出　　处：《机械工程学报》2006年第8期190-194,共5页Journal of Mechanical Engineering

基　　金：江西省自然科学基金资助项目(0150029)。

摘　　要：从非局部摩擦定理出发,建立了振动拉拔加工中的力学平衡微分方程。通过确定有关的非局部影响系数,并结合塑性变形应力应变假设,得到了方程的近似解以及非局部条件下振动拉拔摩擦力的解析表达式。根据给定工艺参数、金属材料力学性能参数和非局部影响系数(ρ,α_o,ε_0,C_0),通过Matlab计算发现,振动塑性加工表面效应的形成是有条件的,并且表面效应的影响因素主要是频率、振幅和非局部影响系数,验证了以往对表面效应定性分析的某些假设,从而实现了振动拉拔表面效应机理的理论初探。According to the non-local friction theorem, the mechanical equilibrium differential equation is built. After some non-local infection coefficients are calculated and the plastic deformation stress and strain hypothesis is used, the approximate solution of the equation and the friction between material and die are obtained. With the given drawing technical parameters, the mechanic performance parameters and the non-local infection coefficients（ρ, α0, ε0, C0）, and many results calculated are finished by using Matlab software, the surface effect is formed in special conditions, and the infection elements of surface effect are mainly frequency, amplitude of vibration and the non-local infection coefficients, and the hypothesis of surface effect qualitative analysis formerly are validated. Then the theoretical preparatory research of surface effect mechanism of drawing deformation with vibration are realized.

关 键 词：振动 拉拔 非局部摩擦 非局部影响系数 表面效应 

分 类 号：TG365[金属学及工艺—金属压力加工]