板材粘性介质压力下的褶皱消除过程研究

发布时间：2017-12-28 12:09

本文关键词：板材粘性介质压力下的褶皱消除过程研究　出处：《沈阳航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：起皱是影响薄壁钣金零件成形精度的最主要因素之一,特别是随着薄壁钣金零件的广泛应用,起皱问题更加容易产生,同时也受到了越来越多的重视。本文基于YBT实验原理及粘性介质压力成形特点,以不锈钢SUS304为板材,采用有限元分析和实验相结合的方法,进行了粘性介质压力条件下的褶皱消除过程研究,确定了消皱过程中的影响因素及变形特点。首先,基于YBT原理设计了粘性介质压力消皱实验装置,通过对褶皱形貌的评价,定义了褶皱消除率的概念,并对粘性介质压力下褶皱消除过程的受力状态进行了简要理论分析,得出了不同受力状态下褶皱变形特点。其次,应用有限元软件ANSYS/LS-DYNA对不锈钢SUS304粘性介质压力下的褶皱消除过程进行分析,得到了粘性介质分子量对褶皱消除过程影响规律;确定了褶皱形貌及受力状态对褶皱消除过程影响规律。最后,采用实验方法对理论和有限元分析进行了验证,进一步验证了实验装置的可行性,以及粘性介质压力下消皱过程的主要影响因素,实验结果与理论分析结果吻合较好。
[Abstract]:Wrinkle is one of the most important factors that affect the forming accuracy of thin-walled sheet metal parts. Especially with the wide application of thin-walled sheet metal parts, wrinkling is more prone to occur, and more and more attention has been paid to it. In this paper, the experimental principle and YBT viscous pressure forming based on the characteristics of SUS304 stainless steel plate, using finite element analysis method combined with experiment, the process of elimination of medium pressure under the condition of viscous folds, the impact factors in the process of eliminating wrinkle and deformation characteristics. First of all, based on the principle of YBT design of viscous medium pressure wrinkle elimination experiment device, through the evaluation of the fold morphology, defines the fold elimination rate of the concept, and the viscous pressure under the fold stress eliminating state process gives a brief theoretical analysis, the deformation characteristics under different stress state of fold. Secondly, using the finite element software ANSYS/LS-DYNA on stainless steel SUS304 viscous pressure under the fold elimination process analysis, the viscous medium molecular weight to eliminate the influence of law of fold; to determine the state of the fold fold shape and influence process of eliminating stress. Finally, the experimental method is applied to verify the theoretical and finite element analysis, which further verifies the feasibility of the experimental device and the main influencing factors of the wrinkling process under viscous medium pressure, and the experimental results are in good agreement with the theoretical analysis.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG306

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