Forming roller for corrugated fin

A pair of forming rollers for forming corrugated fin, each forming roller comprising:

• tooth tip portions having tooth tip concave portions at a tip thereof, said tooth tip concave portions being formed from first and second arc-shaped portions having a first radius at a front side of rotational direction of said rollers, and a second radius at rear side of said rotational direction, respectively, said first radius being larger than said second radius, said tooth tip concave portions having a first apex portion at said front side and a second apex portion at said rear, a radius of a first circle made by connecting adjacent first apex portions of said forming roller being smaller than a radius of a second circle made by connecting adjacent second apex portions of said forming roller;
• tooth bottom portions having tooth bottom convex portions at a bottom thereof and being disposed alternately with tooth tip portions;
• louver cutters for cutting louvers disposed at oblique line portions between said tooth tip portions and said tooth bottom portions, said louver cutters at the oblique line portions being formed to have a predetermined interval from each said apex portions.

A pair of forming rollers for forming a corrugated fin for an automotive air conditioner, said pair of forming rollers includes first forming roller and a second forming roller, each forming roller comprising:

• tooth tip portions having tooth tip concave portions at the tip thereof, said tooth tip concave portions being formed from first and second arc-shaped portions, which are continuously connected, said first and second arc-shaped portions having a first radius at a front side of rotational direction of said rollers and a second radius at a rear side of said rotational direction, respectively, said first radius being larger than said second radius, said tooth tip concave portions having a first apex portion at said front side and a second apex portion at said rear side to position both ends of said first and second arc-shaped portion, a radius of said first apex portion being smaller than a radius of said second apex portion;
• tooth bottom portions having tooth bottom convex portions at the bottom thereof and being disposed alternately with tooth tip portions;
• louver cutters for cutting louvers disposed at oblique line portions between said tooth tip portions and said tooth bottom portions, said louver cutters at the oblique line portions being formed to have a predetermined interval from each said apex portions.