• CN:11-2187/TH
  • ISSN:0577-6686

›› 2013, Vol. 49 ›› Issue (5): 123-129.

• 论文 • 上一篇    下一篇

车身外覆盖件面畸变缺陷模面补偿方法

倪啸枫;沈洪庆;李淑慧   

  1. 上海交通大学汽车车身设计与制造技术研究所;上海交通大学机械系统与振动国家重点试验室
  • 发布日期:2013-03-05

Method of Surface Defects Control by Tool Surface Compensation for Exterior Auto-panels

NI Xiaofeng; SHEN Hongqing;LI Shuhui   

  1. Auto Body Manufacturing Technology Center, Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University
  • Published:2013-03-05

摘要: 面畸变缺陷是指车身外覆盖件成形回弹阶段产生的深度在几十至几百微米的局部小凹陷,面畸变缺陷对整车外观质量影响很大,因此在模具设计阶段即通过准确预测面畸变缺陷并进行补偿和控制十分重要。通过有限元仿真分析和试验验证,能够准确预测车门门把手特征件的面积变缺陷。一种抑制面畸变缺陷的模面补偿方法被提出。通过车门门把手特征件和柱面扁壳特征件的有限元仿真,特征件表面反映面畸变缺陷的二维评价指标在经过模面补偿后减少90%以上,验证了提出的面畸变缺陷模面补偿方法的有效性。该方法基于数值计算获得理想的模面几何模型,通过改变板料在成形过程中厚度方向的应力梯度控制厚度方向弯矩导致的面畸变,为模具在设计阶段对板料成形后的面畸变缺陷进行控制提供了依据和解决方案。

关键词: 车身外覆盖件, 回弹, 面畸变, 模面补偿

Abstract: Surface defects are small concave imperfections that can develop during forming on exterior auto-panel like doors. They occur during springback steps, and the depths are usually from dozens of micron to hundreds of micron. Surface defects can alter significantly the final quality of the automobile and it is very important to predict and control them as early as possible in the design of the forming tools. In order to prove the accuracy of the simulation, a sample panel with a door handle feature is stamped and measured in experiment to be compared with the FEM result. A method of surface defects control by tool surface is advanced. The sample panel with a door handle feature and the sample panel of cylindrical shallow shell are simulated. The quantitative evaluation result of the sample panels’ surfaces decrease above 90% after tool surface compensation. And the validity of the method is approved. Tool surface compensation is a method to control the surface defect by changing the elements nodes of tools. This method bases on numerical simulation. After compensating for several times, the reasonable tool surface mesh is gained. It can control the surface defect result in the bending moment by controlling the stress through thickness direction. It provides the solution to control the surface defects in the design of the forming tools.

Key words: Exterior auto-panel, Springback, Surface defect, Tool surface compensation

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