| 摘要 |
<p>A heat exchanger for a vehicle air conditioning device has: fins (1) which are arranged parallel to each other; and heat transfer pipes which penetrate through the fins (1), are parallel to each other, and are arranged so as to form a staggered pattern on the surfaces of the fins (1). The fins (1) are formed by dividing, by means of a wave shaped cutting die (9), a band-shaped material (2) in which through-holes (3) through which the heat transfer pipes penetrate are formed. A stage pitch (Dp) satisfies the relationships of Dp = C + D + 2W + 2delta and 0 < delta < D + W, where C is the thickness of the cutting die (9), D is the outer diameter of the heat transfer pipes, W is the width of fin collar flanges (5) protruding outward from the peripheries of the front ends of the fin collars (4) of the through-holes (3), the fin collars (4) protruding from one side of the fins (1), and delta is the clearance between the cutting die (9) and each of the fin collar flanges (5).</p> |
