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针对板料冲压过程变形复杂,易出现起皱、拉裂等缺陷,以某型汽车前纵梁内板为研究对象,采用有限元软件DYNAFORM对零件拉延工艺进行了数值模拟仿真。针对零件成形特点,设计了合理拉延形面,并分析拉延筋、压边力及入模圆角的变化对该零件成形效果的影响。通过零件成形极限图优化拉延筋、压边力及入模圆角,最终获得适合该零件的成形工艺参数。试模结果表明,采用优化后的参数可有效改善材料流动状况,消除起皱、拉裂等缺陷,提高成形质量。
In view of the complex deformation of the sheet metal stamping process, such defects as wrinkling and cracking, the inner panel of a certain type of automobile front side member is taken as the research object. The finite element software DYNAFORM is used to simulate the drawing process. Aiming at the forming characteristics of the part, a reasonable drawing surface was designed. The influence of the drawbead, the blank holder force and the molding rounding angle on the forming effect of the part was analyzed. Optimized drawbead, blank holder force and rounding through the part forming limit map, and finally obtained the forming process parameters suitable for the part. The test results show that the optimized parameters can effectively improve the material flow, eliminate the defects of wrinkling and cracking, and improve the forming quality.