| 摘要 |
Conjoint flanging, ironing and pinch-trimming fabrication of integral collars from metal sheet material, e.g. relatively thin work hardened aluminum alloy sheet material, having an aperture overlying a female die assembly of a coaxially arranged flanging and ironing die section and pinch-trim die section, said pinch-trim die section being disposed in predetermined spaced relation with said flanging and ironing die section and having a transverse shoulder contiguously connecting said die sections at the juncture therebetween, the axial position of the shoulder defining the height of the collar to be fabricated, by moving a selectively shaped male plunger having an enlarged sheet engaging portion through said sheet aperture and into operative relation with said female die sections to gradually and incrementally flange and iron the portions of said sheet material disposed about said aperture therein to form an extending collar of reduced wall thickness, and to sequentially force the deformed sheet material at said juncture against said shoulder to pinch-trim excess portions of the flanged and ironed sheet material to provide such reduced wall thickness collar with a uniform height and a well-defined collar edge.
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