MANUFACTURE OF FLUID COOLER

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a fluid cooler capable of improving heat exchanging efficiency and reliability. SOLUTION: An EGR cooler 10 is composed of a double piping structure of an inner pipe 11 and an outer pipe 12. A heat radiating fin 16 is housed and fixed into and to the inner pipe 11. The heat radiating fin 16 is manufactured by drawing a pipe stock of the outside diameter d1 with a roll and a die or the like. And the heat radiating fin 16 is inserted into the inner pipe 11, the inner pipe 11 is diametrically reduced and plastically worked to such an extent that the inner peripheral surface of the inner pipe 11 abuts on the outer peripheral surface of the heat radiating fin 16, and thereafter the heat radiating fin 16 is fixed to the inside of the inner pipe 11 by brazing.