B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/70
B21D 37/00 (2006.01)
Patent
CA 1061653
ABSTRACT OF THE DISCLOSURE The present invention provides a pair of form rolls for producing heat exchanger fin stock from thin sheet metal strip, said rolls having generally triangularly shaped teeth around the outer periphery thereof which are arranged so that when the rolls are rotated in opposite directions the crests of the teeth on each roll mesh with the roots of the teeth on the other roll, each roll comprising a plurality of axially adjacent segments on which said teeth are formed so that the teeth in each roll are defined by a plurality of axially adjacent tooth sections, the contour of one roll segment being the reverse of the contour of the next adjacent segment so that the leading face of each tooth section corresponds in shape with the trailing face of the next axially adjacent tooth section, the leading face of axially alternate tooth sections being convex and the leading face of the other axially alternate tooth sections being concave, whereby both the leading and trailing faces of the teeth on each roll define undulating surfaces when viewed radially, the convex tooth sections of one roll being disposed to mesh with the concave tooth sections on the other roll when the rolls are rotated, the leading and trailing faces of circumferentially adjacent tooth sections terminating at their radially inner ends in shoulders which extend generally radially outwardly and towards each other and intersect in an axially extending straight line adjacent the root between successive teeth, said straight line being disposed radially outwardly of the radially inner ends of said tooth faces, the concave face portions of the leading and trailing faces of the tooth sections on each roll, when viewed axially, intersecting adjacent the crests thereof to define axially extending straight lines which when the rolls are rotated revolve into close proximity and radial alignment with said straight lines adjacent the roots between successive teeth on the other roll.
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