Progressive Die for a U-Bracket, 120 mm Pitch, 3 Bends

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Progressive die for a 2 mm sheet-steel U-bracket: 310 mm strip, 120 mm pitch, piercing – blanking – three bends on both sides – cut-off to a chute. Turn the moving 3D model and switch on the architecture view right on the page.

• 2 mm sheet steel, 310 mm strip, 120 mm feed: piercing, outline blanking, both side walls bent in 3 bends, then cut-off; the part slides out on an inclined chute at the end of the die.
• Walls and tabs bend progressively with the punch on the down-stroke and reach 90° exactly at bottom dead centre; the 3D model shows every bend, the slugs dropping through the relief holes and the part sliding down the chute.
• Architecture view: the frame plates (shoes, backing plates, punch holder, stripper) turn see-through with box outlines while punches, die inserts, pillars, lifters and springs stay solid, so the inside of the die is easy to read.
• Stripper suspended on 12 stripper bolts; 24 nitrogen gas springs of 750 daN (25 mm stroke) are proposed for a stripping force of about 165–250 kN instead of coil springs.
• The lifters follow the stripper and raise the strip 47 mm so the 45 mm deep brackets clear the forming blocks; the feeder only pushes within a ≈ 120° window around top dead centre, once the upper die is open at least 72 mm and every pilot is out of the strip.
• Guided by 4 ball-bearing pillar sets, with longer Ø32 corner pillars and Ø16 stripper guide pins proposed so they stay engaged over the 100 mm stroke; punches, dies and forming blocks in SKD11 hardened to 58–62 HRC, frame plates in S50C; screws, dowels, pillars and bushes are standard parts.