Patent ID: 6739167
Filing Date: 2004-05-25
Classification: B21B

Abstract:
A rolling apparatus for producing component members of heat exchange tubes forming flat heat exchange tubes comprising a pair of flat walls opposed to each other, two side walls connected between opposite side edges of the opposite flat walls, and a plurality of reinforcing walls connected between the opposite flat walls, extending longitudinally of the tube and spaced apart from one another by a predetermined distance,the component members of heat exchange tubes having flat wall forming portions, reinforcing wall forming portions and side wall forming portions projecting from the flat wall forming portions integrally therewith, the rolling apparatus comprising: a central work roll; and a plurality of planetary work rolls arranged around the central work roll and spaced apart circumferentially thereof, annular grooves for shaping the reinforcing wall forming portions and the side wall forming portions provided in a peripheral surface of one of the central work roll and the planetary work rolls; the work roll provided with the annular grooves having different kinds of disks having different outside diameters and arranged on an axis into juxtaposed layers and secured to one another, the disks of each kind being used in a specific number, each of the disks having an outer peripheral surface serving as a working surface; wherein the different kinds of disks are large disks, of a common diameter, arranged at respective portions not forming the reinforcing wall forming portions and side wall forming portions, and small disks, of a common diameter, smaller than the large disks in radius by an amount corresponding to the height of the reinforcing wall forming portions and the side wall forming portions, arranged at respective portions for forming the reinforcing wall forming portions and the side wall forming portions, an outer peripheral portion of the large disks of the work roll projecting radially outward beyond the small disks is tapered toward an outer peripheral edge thereof with a gradually reducing thickness, and a cone angle of the tapered portion of the large disk is 2 to 10 degrees.