一种板材小圆角胀压复合成形工艺解析

发布时间：2018-04-02 19:54

本文选题：板材零件　切入点：小圆角特征　出处：《工程科学学报》2017年07期

【摘要】：针对薄壁板材零件小圆角特征成形制造难的问题,提出了一种新型胀压复合成形工艺.其关键工艺参数为:预成形高度、预成形凹圆角大小和终成形胀形压力与背压凸模运行速度匹配关系.预成形高度决定了终成形小圆角的材料储备,预成形凹圆角的最佳值为充液拉深时凸模圆角可取的最小值,通过理论分析给出了预成形高度和预成形凹圆角的计算方法.建立了胀压复合成形过程力学模型,通过应力状态分析给出了不同胀形压力与背压凸模运行速度匹配关系下坯料圆角区变形状况.同时基于有限元模拟和工艺试验,研究了预成形高度和终成形胀形压力与背压匹配路径对试验件成形质量的影响,验证了理论分析的准确性,并证明了该新工艺的适用性.
[Abstract]:In order to solve the problem of small fillet characteristic forming of thin wall sheet, a new type of bulging and pressing compound forming process is put forward.The key process parameters are as follows: preforming height, the size of the pre-formed concave corner and the matching relationship between the final forming bulging pressure and the running speed of the back pressure punch.The preforming height determines the material reserve of the end forming small fillet, and the optimum value of the preformed concave angle is the minimum value of the convex die angle when the liquid is deep drawn. The calculation method of the preforming height and the preforming concave angle is given through theoretical analysis.The mechanical model of bulging and pressing compound forming process is established. The deformation condition of the round corner of the blank under different bulging pressure and the running speed of the back pressure punch is given through the stress state analysis.At the same time, based on finite element simulation and process test, the influence of pre-forming height and matching path of final forming bulging pressure and back pressure on the forming quality of test piece is studied. The accuracy of theoretical analysis is verified, and the applicability of the new process is proved.
【作者单位】：北京航空航天大学机械工程及自动化学院;
【基金】：国家科技重大专项资助项目(2014ZX04002041) 国家自然科学基金资助项目(51175024)
【分类号】：TG306

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