• CN:11-2187/TH
  • ISSN:0577-6686

›› 2005, Vol. 41 ›› Issue (11): 127-133.

• 论文 • 上一篇    下一篇

一种基于等势场的胀形坯料反推新方法

李超;李付国;张莹;李超玲;刘玉红   

  1. 西北工业大学材料学院
  • 发布日期:2005-11-15

REVERSE EDUCING METHOD OF BULGE-BLANK BASED ON EQUIPOTENTIAL FIELD

Li Chao;Li Fuguo;Zhang Ying;Li Chaoling;Liu Yuhong   

  1. College of Materials Science and Engineering, Northwestern Polytechnical University
  • Published:2005-11-15

摘要: 为提高产品的质量、降低生产成本,需要合理地确定成形件的毛坯形状。而传统的方法不仅精度低,而且费时、费力,难以满足质量和效率的要求。基于已有的电模拟坯料展开方法,提出了一种新的关于胀形件的类等势场反推坯料展开方法。该方法基于能量最小原理和最小阻力原理,利用塑性变形过程中坯料的流动规律类似于静电场等势线所描述的结果这一特性,来反推胀形时的成形坯料。并将该方法应用于TC4合金板料的超塑性胀形工艺,计算了坯料的各项参数以及坯料内部的应变分布,并对应力及气压胀形力进行了简要的分析。最后将该方法计算结果与有限元计算结果相对照,结果表明,该方法避免了复杂的几何解析运算,提高了效率,结果可靠和方法可行。

关键词: 等参单元, 等势场, 反推法, 胀形坯料, 几何形态, 搅拌针, 无倾角搅拌摩擦焊, 作用特征

Abstract: In order to improve the quality of the product and reduce the cost, the appropriate shape of the blank must be determined. However, if using the conventional method, not only lots of time and man-power would be wasted but also the high accuracy, quality and efficiency could not be achieved. Based on the electric analog method for blank unfold which has already exist, a new reverse educing method about bulge-blank unfold based on equipotential field is introduced. The appropri-ate shape of the bulge-blank is obtained through the reverse educing method, which is based on the minimum energy theory and the minimum resistance pressure theory, and utilize the similarity between the blank flow law and the isopotential line of the electrostatic field. The superplasticity bulging process for Ti-6Al-4V blank is studied by using this method, a variety of parameter and the strain distribution of the blank are calculated, and the stress and the atmospheric pressure for the bulging are analysed. This method avoid the complex analytic calculation of the geometry and the time-consuming iteration solution, and improve the efficiency by composed to the FEM (Finite element method). This method is feasible and its result is credible.

Key words: Bulge-blank, Equipotential field, Isoparametric element, Reverse educing method, Affecting characteristic, Geometrical configuration, Non-tilting friction stir welding, Tool pin

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