复合材料制件Invar钢光顺模具型板冲压成形回弹性能研究

Research on Springback of Invar Alloy Smooth Composite Mould Plate Stamping Process

针对双曲度板材回弹难以预测,对成形效率和质量存在不利影响的问题,对基于活络方形压头非对压技术的Invar钢模具型板冲压成形的回弹问题进行了系列试验研究。试验主要针对不同形状的帆形板和鞍形板进行,结果表明,由于该设备成形力学状态的复杂性,回弹具有一定的不确定性,但也存在明显规律。针对试验板有以下规律:至边缘位置距离的大小对回弹有重要影响,中间位置的板材回弹明显比板边缘处小;板的曲率越大,回弹越小;鞍形板比帆形板回弹小。研究结果可用于指导使用可变模具成形较均匀光顺的型板零件。

To predict the springback of double curvature plates is difficult.Springback has negative effects on forming efficiency and quality.A series of experiments were carried out to study the springback problem of Invar alloy smooth mould plate forming process based on the flexible square pressure head technique.The experiment aimed at punching different sail and saddle shaped plates.Due to the complexity of the forming mechanical state of the equipment,springback has certain uncertainties,but there are clear rules:The distance from the edge of the plate has an important impact on the springback,the springback of plate at middle position is obviously smaller than the edge;The larger the curvature is,the springback is smaller,but not stable;The springback of saddle shape is smaller than that of the sail shape.The results are useful to guide the forming of smooth sheet products with uniform deformation by flexible die.