HEADER FOR HEAT EXCHANGER, HEAT EXCHANGER PROVIDED WITH THE HEADER, AND MANUFACTURING METHOD OF THE HEADER

摘要

PROBLEM TO BE SOLVED: To manufacture a header for a heat exchanger at a low cost by simply, easily, and reliably inserting tubes into slit holes collectively without disposing an external member such as a positioning member onto the tubes.;SOLUTION: A plurality of slit holes is formed in a direction at right angle to the longitudinal direction in a thick cylindrical pipe by perforating and slenderly opening a part of the cylindrical pipe, an opening surface part being formed by plastic-deforming the formed opening part toward the cylindrical pipe inner side. The slit hole is formed into such a shape that a curve surface formed toward the cylindrical pipe inner side on an opening inlet surface opposite to a width direction of the opening surface part, both wall surface parts opposed with a constant width, and a flare provided on both edge parts of the opening surface part and protruding toward the cylindrical pipe outer side corresponding to punch both edge shapes are formed.;COPYRIGHT: (C)2015,JPO&INPIT