The experimental device is a roll forming machine,the specimen is a circular costed lead disk costed lead.Through the experiments the geometry characters of roll formed grooves are discovered.

• 实验发现,盘型件双面辗压与其他局部成形的明显区别在于双面辗压的沟槽深度小于辗压头的压痕深度(即压下量),将给此差值命名为“甩高”,并用甩高、槽深、压痕深度描述沟槽的基本几何形态。