| 摘要 |
PCT No. PCT/CA93/00284 Sec. 371 Date Jan. 6, 1995 Sec. 102(e) Date Jan. 6, 1995 PCT Filed Jul. 9, 1994 PCT Pub. No. WO94/01233 PCT Pub. Date Jan. 20, 1994A two stage die set for sequentially blanking an opening in a work piece, and thereafter forming edges of the work piece around the opening and having a male die assembly, having a male blanking die, a male forming die spaced from the male blanking die, and a recess therebetween, a female die assembly having a generally hollow female die sleeve, the die sleeves being shaped and dimensioned to correspond to the shape of the male blanking die and to receive it in telescopic relation, a moveable support plate located around the female die sleeve the moveable plate being biassed so as to urge it into a first extended position, and the moveable plate yielding to the male forming die of the male die assembly, when the male and female dies are closed together, so that the male blanking die, in co-operation with the female die sleeve blanks out a portion of a work piece and forms an opening, and upon further relative movement between the male and female dies towards one another, the male forming die co-operates with moveable plate and the female die sleeve, to cause deformation of an edge portion of the work piece around the opening. |
