| 摘要 |
<p>PROBLEM TO BE SOLVED: To mold a flat and slopeless fin apex while preventing a fracture of a fin material by securing the gap between the front salient of a tooth tip recess and a tooth bottom salient even when a gear that drives a molding roller wears out.SOLUTION: In a corrugated fin molder that molds a rectangular wave-shaped corrugated fin the fin apex of which is flattened by making a strip of fin material pass through between a pair of molding rollers 11, 12 that have a tooth tip recess 13 at the tooth tip and a tooth bottom salient 14 at the tooth bottom to longitudinally compress a molded fin material, the tooth bottom salient 14 is arranged on the center line of the tooth bottom to keep the height of a salient 13r on the rear side of the tooth tip recess 13 in a molding roller rotation direction higher than the height Hf of a salient 13f on the front side of the tooth tip recess 13 in a molding roller rotation direction.</p> |
