作　　者： ; ; ;

机构地区： 燕山大学机械工程学院

出　　处： 《机械工程学报》 2012年第20期63-69,共7页

摘　　要： 在平截面和平面弯曲等一系列假设条件下,建立拼焊宽板V形自由弯曲回弹的解析预测模型,所建立的回弹预测模型考虑差厚拼焊板截面几何的非对称性,确定差厚拼焊板在指数硬化规律下的应力中性层的位置。在自由弯曲卸载分析阶段,引入两母板间相互作用弯矩,基于单一母板求解拼焊板母板回弹后的弯曲角。采用Fortran语言编制计算程序,应用增量数值方法求解差厚拼焊宽板V形自由弯曲模型中行程与弯曲角和回弹后弯曲角的非线性隐式关系。将V形自由弯曲模具装至改造后的拉伸试验机的活动横梁上,在不同的凸模行程下,分别对两种料厚比(0.8/1和2.5/2)拼焊板进行V形自由弯曲试验,试验结果与拼焊板V形自由弯曲预测模型的计算结果较吻合,为拼焊板V形弯曲回弹实时控制技术研究奠定理论和试验基础。 The analytical springback prediction model of tailor welded blanks （TWBs） for air bending process is put forward under a series of assumptions such as the plane section and plane bending, the asymmetry of the cross-section of TWBs is taken into account in the prediction model. The location of stress neutral layer of TWBs is determined using the exponential hardening law. The angle after springback for TWBs is calculated by incorporating the interaction moment between two parent planes on the phase of unloading. The nonlinear implicit relationship between punch displacement and the unloaded or loaded angle is solved by incremental numerical method, the code is compiled using Fortran language. TWBs＇ air bending experiment is performed using improved tensile test machine for the two thickness ratios＇ TWBs （0.8/1 and 2.5/2）, the results of experiment and analytical prediction model for the two thickness ratios＇ TWBs are agreed well with each other, it is the foundation of the theory and experiment for TWBs＇ air bending process real-time control technology.

关 键 词： 拼焊板 自由弯曲 回弹

领　　域： [金属学及工艺]