| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat exchanger which not only allows a plurality of flat pipes to be easily assembled into a case but also allows the plurality of flat pipes and the case to be assembled with high accuracy.SOLUTION: This method is for manufacturing an EGR cooler equipped with a flat pipe, which has a midsection with a rectangular cross section consisting of a short side and a long side and an opening at one end and an opening at the other end with rectangular cross sections consisting of short sides and long sides larger than the short side of the midsection and is joined at the short side, and a case, which stores a plurality of laminated flat pipes. This method also includes a flat pipe assembling process in which the flat pipe is assembled to the case so as to be laminated thereon, a jig insertion process in which a jig is inserted into each flat pipe to elastically transform a space in a direction of the short side of each flat pipe thereby closing it up, a temporarily fixing process in which the long sides of the respective flat pipes are temporarily fixed to each other while the space in the direction of the short side of each flat pipe is closed up. Each flat pipe and the case are brazed while bing temporarily fixed. |
