Patent GB-1016262-A (GB)
Title: Improvements in or relating to combination fin-forming and fin-attaching methods andapparatus
Inventor: SCHULER OTTO REINHOLD
IPC: B21C37/26
Filed: 1962-08-20
Abstract: 1,016,262. Making helically finned tubing; rolling; coiling. CALUMET & HECLA Inc. Aug. 20, 1962, No. 31964/62. Headings B3A, B3E and B3M. Helically finned tubing is formed by coiling strip on edge into a helical groove in the tubing. Strip S is thinned at one edge and thus coiled by a disc 19 co-operating with a driven forming roll 26 rotated about an axis at right-angles to axially moved tubing 20. The strip S coils on edge in a helical groove 21 in the tubing 20 and the resultant helical fin F is clinched to the tubing 20 by discs 18, coaxial with the disc 19. Three sets of discs 18 are carried on arbors 1, 2 and 3 spaced 120 degrees apart around the tubing 20. Bearing surfaces 37, bearings 41, 44 support the roll 26. Rollers 50, 51, Fig. 2 (not shown), may provide additional support for the discs 18. In a modification, Fig. 4 (not shown), the strip S is coiled by the co-operation of a disc 19<SP>1</SP> and a ring 84 rotated about an axis inclined to the axis of the tubing 20, anti-friction rollers 94 taking-up side pressure on the ring 84. The ring 84 may be positively driven through gear teeth 98. However, the rotation of the ring 84 may be solely under frictional engagement with the fin material. In another modification, Fig. 5 (not shown), the strip is coiled by a disc 144 co-operating with a forming roll 141, not positively driven, the disc 144 being urged by adjustable spring means 147 and a bracket 131 supporting the roll 141 is adjustable about the axis of the arbor 1. In a further modification, Fig. 7 (not shown), the fin is coiled by a disc 144, which may be idle or be positively rotated with the arbor 1, cooperating with a roll 173 not positively driven, the tube 20 is grooved by discs 159, 161, which may be driven, and the grooves sized by discs 167, and the fin secured by discs 157. The axis of the roll 173 is adjustable so that it may be offset from the axis of the tube 20. In another embodiment, Figs. 8, 9 (not shown), positively driven discs 181, 182 form the grooves and a disc 183, which co-operates with the roll 173 to coil the strip, is positively driven at a speed greater than that of the discs 181, 182. A central mandrel 22 may support the tube 20. A clamp member 227 tensions the strip at the start of the operation. A strip guide 233 and a fin guide 239 are provided. In a further embodiment, Fig. 14 (not shown), fin attaching discs 270 are fixed on a driven arbor 271, the fin forming disc 266 being mounted on the driven arbor 1. The tube is grooved by discs 284. In another embodiment, Figs. 15, 16 (not shown), instead of three arbors 1, 2 and 3, spaced 120 degrees about the tube 120, two arbors 1, 2<SP>1</SP> diametrically opposed are used. The strip is coiled by a disc 287 on the arbor 1 co-operating with a frusto-conical roll 293. Idler rollers 300 help to centre the tube 20. A groove sizing disc 290, fin attaching discs 291 and fin straightening discs 292 are carried by the arbor 2<SP>1</SP>, while driven fin attaching discs 288 are carried by the arbor 1. In an embodiment of Fig. 17 (not shown), the tube 20 is grooved by discs 403, 409 and the strip is coiled on to the tube 20 by a disc 405 co-operating with a collar 404 and secured by discs 410. Alternatively, Fig. 18 (not shown), grooving and securing discs may be mounted on the same arbor 1 as the coiling disc, or Fig. 19 (not shown), the grooving discs may be mounted on a separate arbor.