Method for making extended heat transfer surfaces and a tool for

Details Method for making extended heat transfer surfaces and a tool for Method for making extended heat transfer surfaces and a tool for

1985-09-18

1987-06-16

Crane, Daniel C.

Metal deforming

With cutting

By composite tool

72 71, 291573A, 291573R, B21D 5304, B21D 5306

Patent

active

046728341

ABSTRACT:
A method for making integral fins on plane or curved heat transfer surfaces wherein a fin is obtained by making an inclined cut on the surface itself to provide a thin strip or layer of metal connected to the surface along one edge, raising said layer and bending it around said connecting edge to a substantially perpendicular relation with respect to said surface. For putting said method into practice a finning tool is provided wherein the cutting angle of its cutting edge increases from a nose, the length of cutting edge is greater than the one of the fin to be formed and the cutting edge itself is inclined so as to obtain a cutting line inclined with respect to the profile of the surface.

REFERENCES:
patent: 634469 (1899-10-01), Majert
patent: 2162693 (1939-06-01), Berg et al.
patent: 3753364 (1973-08-01), Runyan et al.
patent: 3791003 (1974-02-01), Pasternak
patent: 3886639 (1975-06-01), Pasternak
patent: 4100784 (1978-07-01), Thomas

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