AIR FIN FOR HEAT EXCHANGER, AND METHOD OF MAKING THE SAME

An air fin for a heat exchanger has air channels defined by corrugations, the corrugations having generally planar flanks joined by alternating crests and troughs. Perforations extend through portionsof at least some of the flanks and are aligned within two spaced apart planes. A rectangular aperture extends through at least two consecutive ones of the corrugations, and is bounded by the two planes. A method of making the air fin includes forming perforations into a continuous strip of metal sheet at regular intervals, corrugating the strip to form crests and troughs between the perforations,and punching out a portion of the strip at regular intervals. The punching out includes shearing webs between the perforations, and results in the formation of the rectangular aperture. 种用于热交换器的空气翅片，具有由波纹限定的空气通道，波纹具有通过交替的波峰和波谷连接的总体平面的侧翼。穿孔延伸穿过至少些侧翼的部分，并且在两个间隔的平面内对齐。矩形孔延伸穿过波纹中的至少两个连续的波纹，并通过两个平面界定。种制造空气翅片的方法，包含以规则的间隔在金属板的连续带上形成穿孔，使带起皱褶以在穿孔之间形成波峰和波谷，并且以规则的间隔冲压带的部分。冲压包含剪切穿孔之间的网，并且导致形成矩形孔。