Patent ID: 6138354
Filing Date: 2000-10-31
Classification: B21D,F02B,F28D,F28F,Y02T,Y10T

Abstract:
A method for manufacturing a corrugated plate having a wave shape using a plurality of rollers, said corrugated plate being disposed within a tube in which a fluid flows for a heat exchanger, said method comprising step of:moving a flat plate-like fin material in a moving direction to pass through said rollers; andforming a plurality of bent ridge portions from a center of said flat plate-like fin material toward both end sides of said flat plate-like fin material in order in a spreading direction of said wave shape perpendicular to the moving direction during said moving step, each of said bent ridge portions extending in a ridge direction parallel to the moving direction, and having an approximately equal height,wherein said forming step includes a step for forming a bending angle (.THETA.) of an end bent ridge portion in the spreading direction among said bent ridge portions, said bending angle (.THETA.) being smaller than any bending angle (.THETA.) of the other bent ridge portions and said end bent ridge portion always being an open end.