| 摘要 |
FIELD: process engineering.SUBSTANCE: invention relates to metal forming. Blank is made with punched holes at points corresponding to weal sections at drawing and located opposite eased edges of minimum radius of curvature of box wall in plan, their sizes being defined beforehand. Box drawing is performed at every of said eased edge of minimum radius of curvature of box wall in plan to make the main section over box wall height from blank end part and to align it with folding of extra section over the box wall height. Note here that blank flange definite pressing force is set. At termination of drawing and reaching the extreme bottom position of drawing press, remaining flange folds are straightened between punch working surface and female die pressure surface by press slider so that box bottom is straightened.EFFECT: higher quality, reduced faulty rate.2 dwg |
