12.7mm Fin Die

Progressive fin stamping die, model Φ12.7×8R×1P, built for a 63T C-type fin press with a 60mm slide stroke. Fin specification: 50mm hole pitch within a row, 25mm pitch between rows, Φ13.2mm fin hole plus a Φ13.1mm heat-pipe hole pierced in the same station, 25mm width (single row), staggered hole pattern, V-shaped corrugated fin surface, stamped in continuous strips of 4 to 36 holes per fin length. Compatible material: O-temper or H22 hydrophilic bare aluminum foil, 0.25mm / 0.3mm / 0.35mm thickness, 240mm ±1mm width. Collar height is adjustable per material thickness: 3.2–9.0mm at 0.25mm, 3.2–10.0mm at 0.3mm, and 3.2–12.0mm at 0.35mm, with more than 13mm of wedge adjustment range available. Punching process (7 stages): 1. Drawing — completed in multiple steps; height is set independently at each step via a German-made SIKO regulator on the die. 2. Piercing (including heat-pipe holes) — punching completes early in the press stroke, before the draw finishes. The piercing sub-die uses an independent guide-post/guide-sleeve structure for forming accuracy and long service life, with replaceable backing plates to protect the lower die plate. Punch-to-die concentricity is held within 0.002mm for full interchangeability of wear parts. Punches are air-purged in both directions with automatic mist lubrication for forced chip removal. 3. Reflare — collar height adjusts arbitrarily via the same SIKO regulator. 4. Side cutting — an independent structure trims excess side material with a double-edged upper knife for extended tool life; the side-cutting position can shift 1–2 rows left or right to accommodate thicker material. 5. Row slitting — upper and lower blades cut any number of fin rows in a quick-swap, drawer-type cartridge (upper plate covers columns 1–7); blades are universally interchangeable with a controlled gap for clean, fringe-free strip cutting. 6. Feeding — a pull-type feed uses fine grippers seated in the formed holes, driven by a connecting rod between die and press; feeding fingers are SKD11 tool steel to hold positioning accuracy over long production runs. 7. Cut-off cutting — length-wise cutoff is actuated by cylinder, solenoid valve and the press's electrical control, using oil-free lubrication at the cut face. An independent adjustment sets each row's fin curvature; cut-off position can shift half a progression for precise, collision-free hole alignment, with a limiter for fast, repeatable positioning. Build quality: wear parts (piercing punch/die, row-cutting, side-cutting, cut-off cutting) are ASP30 tool steel from Sweden at HRC62–64; upper/lower plates are P20 pre-hardened steel (China); the sub-die frame is PDS5 pre-hardened steel (Japan); punch/die fixing plates and strippers are PDS5 pre-hardened steel (Germany). All guide posts, sleeves, the feed shaft and side-cutting parts run on timed, metered lubrication; screws, pins and springs are metric standard. Quality assurance: 12-month warranty from delivery/acceptance, with lifetime paid maintenance available. Punching parts are guaranteed for 25 million+ strokes on aluminum foil before resharpening is needed, at 0.05–0.1mm per regrind, with at least 10 regrinds available over the die's service life. On-site commissioning by our engineer is available for installation on the buyer's own press.