Projection row (2) and recess row (3) are alternately and successively formed in a direction (Y-direction) perpendicular to a direction (X-direction) of their rows, thereby forming a corrugated cross-sectional shape of a cross-sectional wave shape. Between projection row (2) and recess row (3), there is provided inclined wall surface (4) having a wave shape in plan view. Each of projection row (2) and recess row (3) has a shape in a cross-section along X-direction that is formed into a corrugated cross-sectional shape of a wave shape. Pitch and height difference between valley portion (5) and crest portion (6) in the corrugated cross-sectional shape along this X-direction are smaller, as compared with a relationship between projection row (2) and recess row (3) in the corrugated cross-sectional shape along Y-direction. The corrugated metal plate of such shape has advantages that machining for making cross-sectional shapes in two directions of X and Y into wave shapes is easy and that the flexural rigidity difference between two direction of X and Y is extremely small.

Metal plate and metal cover employing same

PURPOSE:To obtain the fin with good heat conductivity by forming many breaks in parallely and in zigzag on the belt like metallic strip and the plastic deforming process so that the above breaks are made on the boundary of the bent and the boundary of the honeycomb. CONSTITUTION:By plastically deforming the belt like metallic strip 1, the fin of honeycomb structure of the trapezoid shaped wave of vertical section and the plane triangular wave shaped both edge part of the ridge line of the above wave and both edge parts of the valley part is manufactured. The break forming process which forms many breaks of the same and longer than the mutual separated distance parallel and in zigzag is set. Next, the process of the above plastic deformation so that above breaks 2 is made on the bending boundary 4 of the including surface 3 of the wave and the boundary 5 of the nearby honeycomb is executed. Therefore, the flat surfaces 6, 7 of the trapezoid wave like can be formed precisely on the fin with good heat conductivity can be obtained by connecting the above surface to the other heat exchanger part. The fin with large rigidity and high pressure resistance can thus be offered.

Kinoshita Takahito

Papers

Manufacture of fin for heat exchanger