Patent ID: 6594896
Filing Date: 2003-07-22
Classification: B21D,F28F,Y10T

Abstract:
A method for making corrugated fins for heat exchangers which are formed into a corrugated configuration having a plurality of folded portions and which each have louvers formed in flat flank portions connecting adjacent folded portions by cutting part of said flank portions to let the portions so cut rise in a shutter-like fashion, said method comprising a pressing process in which strip metal is subjected to press working so that said strip metal is formed into a corrugated configuration while louvers are being cut and raised in part of said strip metal, a heat treatment process in which residual stress generated in said strip metal is removed after the completion of said pressing process and a compressing process in which said corrugated strip metal is compressed so as to reduce the radius of curvature of said folded portions after the completion of said heat treatment process.