轿车顶盖冲压成形塌陷研究

发布时间：2018-02-20 17:02

本文关键词： 外覆盖件顶盖塌陷刚度压边力残余应力　出处：《中南大学学报(自然科学版)》2015年05期 　论文类型：期刊论文

【摘要】：以实践中产生塌陷的某轿车顶盖为对象,结合物理实验、数值模拟以及板料弹塑性变形的力学本质,研究制件冲压成形的塌陷问题,分析塌陷的影响因素。研究结果表明:塌陷取决于材料特性、料厚、制件几何形状以及压边力等多方面因素;该顶盖成形后板面内的塑性变形程度小导致其形状冻结性差、制件结构刚度不足、残余压应力引发失稳,是产生塌陷的根本原因;增大压边力与板料厚度,会导致板平面的残余压应力增加且分布不均匀,使塌陷更加严重;重力也是引起塌陷的一个不可忽视的因素,可以通过优化制件形状、提高结构刚性予以解决。
[Abstract]:Taking a car roof which has collapsed in practice as an object, combined with physical experiments, numerical simulation and the mechanical nature of elastic-plastic deformation of sheet metal, the collapse problem of stamping forming of the workpiece is studied. The research results show that the collapse depends on many factors, such as material characteristics, material thickness, geometric shape of the workpiece and blank holder force, and the low degree of plastic deformation in the sheet after forming results in the poor freezing property of the shape. The fundamental cause of collapse is the lack of stiffness and instability caused by residual compressive stress, the increase of blank holder force and sheet thickness will lead to the increase and uneven distribution of residual compressive stress in the plane of the plate, which will make the collapse more serious. Gravity is also a factor that can not be ignored. It can be solved by optimizing the shape of the parts and increasing the rigidity of the structure.
【作者单位】：重庆大学材料科学与工程学院;东风汽车模具有限公司;
【基金】：国家重大科技专项(2012ZX04010-081)~~
【分类号】：TG386

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