THE EFFECT OF DEFORMATION CONDITIONS ON T HE OCCURRENCE OF FLUTING AT3-PIECES CAN BODY MAKING

The continuously annealed tinplate with low carbon chemistry often exh ibits the ''fluting'' trouble which is associated with stretcher strai n defect, when it is roll-formed for making a 3-pieces can body. For p reventing the occurrence of fluting, the influence of the forming cond itions is focused in this study, leading to following results. The ''f lexor treatment'' just prior to roll forming, recognized as effective for solving the problem, is attributable to the reduction of both the yield point elongation and yield strength in the tinplate. Furthermore , the tendency of the fluting occurrence can be drastically decreased by employing high speed or low temperature roil-forming condition. A g reater number of stretcher strain pattern on the deformed sheet is int roduced by the high speed or low temperature deformation. This, in tur n, suppresses clear recognition of the stretcher strain pattern prefer ably.