The effect of inclined angle and positioning on the sheared edge in mechanical trimming using hot half-trimming of 22MnB5

AbstractHot-stamped parts using 22MnB5 sheet have been increasingly applied to the automotive body-in-white to reduce weight with high crashworthiness. The drawn panel should be trimmed by high-priced laser cutting or press trimming to be a complete part. The authors previously suggested the hot half-trimming method to achieve the press trimming of the hot-stamped part with extremely high strength. In this study, the effect of inclined trimming angle and positioning error of the trimmed part within the clearance on the sheared edge has been investigated. The analytical and experimental results of trimming considering inclined angle and positioning error showed that the quality of sheared edge is improved with the increase in inclined angle and practically allowable burr below 0.1 μm appears regardless of the clearance in subsequent mechanical trimming process.