Method of manufacturing a heat exchanger steel
AssigneeCaterpillar Tractor Co.
InventorsBilly J. Davis, Harry J. Dawson, Ervin E. Mangus, Kenneth J. Miller
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Abstract
A method of making a heat exchanger sheet is disclosed including progressively forming an elongated flat sheet of metal into a continuously corrugated sheet having a plurality of deeply drawn convolutions which extend across the sheet, and compressing the periphery of the corrugated sheet to provide a substantially flattened edge portion while retaining a centrally disposed corrugated portion with minimal cold working thereof. Preferably, the sheet made thereby has convolutions with slightly sloping walls to better provide a geometrically uniform overlapped pattern in the flattened edge portion thereof.
Claims6
A method of manufacturing a heat exchanger sheet comprising;
- foldably forming an elongated flat sheet of material into a continuously corrugated sheet by feeding the flat sheet progressively through a forming apparatus, the corrugated sheet being formed with a plurality of deep transverse convolutions which extend across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern;
- and
- compressing the periphery of said corrugated sheet to provide a substantially flattened edge portion with a fully overlapping geometrically repetitive collapsed pattern of at least three thicknesses of sheet material while retaining a centrally disposed corrugated portion with minimal cold working thereof.
The method of claim wherein said convolutions extend upwardly and depend downwardly a substantially similar distance from a central plane thereof and including the step of compressing the periphery of said corrugated sheet in a die press so constructed and arranged as to position said flattened edge portion on said central plane.
A method of manufacturing a heat exchanger sheet comprising;
- progressively foldably forming an elongated flat sheet of metal into a continuously corrugated sheet having a plurality of transversely oriented and sinuously profiled convolutions which extend fully across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern;
- and
- compressing the periphery of said corrugated sheet in a die press so constructed as to provide a substantially flattened edge portion on a central plane of said corrugated sheet with a fully overlapping repetitive pattern of at least three thicknesses of sheet material while retaining a centrally disposed quadrilaterally-shaped corrugated portion with minimal cold working thereof.
Dependencies are inferred from the claim text.