US3722248A - Tube forming method and apparatus - Google Patents

Tube forming method and apparatus Download PDF

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Publication number
US3722248A
US3722248A US00046876A US3722248DA US3722248A US 3722248 A US3722248 A US 3722248A US 00046876 A US00046876 A US 00046876A US 3722248D A US3722248D A US 3722248DA US 3722248 A US3722248 A US 3722248A
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US
United States
Prior art keywords
strip
horn
set forth
edges
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00046876A
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English (en)
Inventor
W Brunken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCIENT TUBE Inc
SCIENTIFIC TUBE INC US
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SCIENT TUBE Inc
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams

Definitions

  • ABSTRACT A flat strip of metal moving lengthwise first has its [52] US. Cl ..72/176, 72/181 edges turned up by roll-forming Thereafter it moves [51] 1151. C]. ..B21d 5/08 into the large end of a horn and along one side of the Fleld of Search horn so that that side imposes an increasing 219/59 curvature on the metal and at the exit end of the horn the metal is substantially cylindrical.
  • a non-galling [56] 7 References C'ted surface is used on the contact face of the horn.
  • a pin UNITED STATES PATENTS between the edges cf the sheet at the exit end of the horn orients the cylindrical tube.
  • a conventional limit is that the diameter of the finished tube must be less than 100 times the wall thickness (i.e., the thickness of the sheet from which the wall is made). This limitation becomes particularly significant when it is desired to form tubing of relatively thin material. At the same time, there is a substantial commercial demand for tubing having a relatively thin wall. It can, for example, be used in automobile radiators and other applications where the pressure differential across the wall is not particularly great.
  • the principal object of the present invention is to provide a method and apparatus by which even very thin walled material may be quickly and accurately formed into a cylinder for welding. Furthermore, a constant alignment of the two edges of the material is obtained thus speeding and simplifying the welding of those two edges together. For example, a prototype of v the invention has operated very satisfactorily at speeds of 170 inches a minute and there is no apparent reason why speeds much in excess of that cannot be obtained. After welding, the quality of the tubing is so exceptionally good that those skilled in the art are skeptical from looking at the finished product that it could have been produced at speeds even. comparable to those conventionally employed.
  • edges of the strip are first curved by roll-forming and the finished forming of the tube is done by confining the strip in a horn which has an exit diameter approximately that desired for the finished tube.
  • FIG. 1 is a plan view of an embodiment of the invention.
  • FIG. 2 is a side elevation of the embodiment of FIG.
  • FIG. 3 is an enlarged partial perspective view
  • FIG. 4 is a slightly different partial perspective view
  • FIG. 5 is a section as seen at line 5-5 of FIG. 4 with portions broken away;
  • FIG. 6 is a view at line 6--6 of FIG. 2.
  • the disclosed embodiment includes a first section, generally 12, for initially bending the edges of a metal strip 14, and a second section, generally 13, in the form of a horn for curling the strip 14 into a generally cylindrical form 15.
  • the edge forming section 12 comprises two pairs of opposed forming rolls, the first pair comprising rolls 17,
  • rolls 18, and the second pair comprising rolls 19, 20 are suitably journaled in the frame portion 21.
  • Rolls 17 and 19 are convex and mate with the respective concave rolls 18 and 20.
  • a pair of guides 22 on frame 21 align the strip 14 as it moves into the forming rolls.
  • One or more of these rolls can be connected to a suitable power means 23 to provide the driving impetus to move the strip 14 through the apparatus.
  • the second section 13 can be called a horn. It comprises a solid body 25 with a cap 26 at one end and with the two defining a tapered opening 27 therethrough.
  • Opening 27 is relatively large at the entrance end 27a and relatively small at the exit end 27b.
  • the diameter of the opening at the exit end 27b is only slightly larger than the desired external diameter for the'finished tubing.
  • An aperture 28 extends along the upper side of the horn. Extending through the aperture are a plurality of devices for positioning the strip 14 within the horn opening 27. These comprise four rollers 30-33 journaled on shafts respectively 34-37. Also, there is a block 39 having extending ends 40. The ends of the block extend into slot 41 in body 25. Pins 42 are journaled in ends 40 and are secured to body 25 so that the block can reciprocate vertically. Springs 43 resiliently urge the block upwardly until the ends 40 are in contact with the heads of pins 42.
  • a second slot 44 also is provided in body 25 to receive a corresponding block. In the operation of an actual embodiment it was found necessary only to use one such block positioned in slot 41, and rollers 31, 32 and 33 were omitted.
  • nongalling lining 48 As illustrated in FIG. 5, this lining was a nylon, which was applied in liquid form and then hardened (a commercially available practice).
  • Various other plastics known for their hardness and lubricity could be employed, such as one of the polymerized tetrafluoro-ethylene plastics such as that sold under the trademark Teflon. It could be a metal, such as a silver plating, often employed for its non-galling characteristics.
  • the prototype of the present invention was employed to form thin stainless steel strip 14 into tubing. Even on a hard, polished tool steel horn the thin stainless steel was scratched to an extent that its wall thickness was reduced by as much as 12 percent. This could not be tolerated in the finished tubing. With tubing of other materials and perhaps of greater wall thicknesses what galling there might be could perhaps be tolerated.
  • the nylon lining was quite effective in eliminating the galling of the stainless steel sheet being formed into a tube.
  • the purpose of the apparatus is to take a flat strip of metal 14 and to turn it into a substantially cylindrical form 15 for movement into a welder 50.
  • the two edges 14a and 14b are brought together, or almost together when the sheet is in the cylindrical form so that they can thereafter be connected in the welder. In the illustrated embodiment these edges are not brought completely together until after they are in the welder.
  • a pin 51 is positioned between the edges 14a and 14b at the exit opening 27b of the horn. This pin is secured to the cap 26 and serves to accurately fix the orientation of the edges 14a and 14b in their rotational position about the axis of the tube so that they are always in the same place. This greatly facilitates and speeds up the welding operation to have the seam always at a particular location about the axis of the tube, in addition to resulting in a better finished product.
  • the strip 14 is driven through the apparatus by any suitable means.
  • the guides 22 serve to accurately align the strip with respect to the forming rolls 17-20.
  • the two pair of rolls bend the strip 14, particularly in the areas adjacent the two edges 14a and 14b into a curved configuration. See particularly FIGS. 3, 4 and 5. This is very important, not only to provide proper movement of the strip through the born, but also with respect to avoiding peaking of the welded tube.
  • the strip moves through the horn and as it does so it gradually acquires additional curvature corresponding to the curvature of the interior of the horn until it is substantially circular in cross section at the exit opening 27b.
  • the rolls 30-33 are employed for the purpose of forcing the strip 14 to conform to the interior configuration of the horn.
  • the block 39 has a rounded bottom edge which is positioned just above the line traversed by the two sheet edges 14a 14b when the sheet is centered in the bottom of the horn. Should the sheet 14 tend to curl to one side, i.e., no longer be centered at the bottom of the horn, the respective edge 14a or 14b will contact the bottom of block 39 and prevent the sheet from shifting very far out of its proper position at the bottom of the horn.
  • a single set-up can be employed for different diameters of tubing, merely by changing the cap 26 and adjusting the guides 22.
  • a strip 14 having a width between edges 14a and 14b proportionately smaller would be employed.
  • the guides 22 would be adjusted in width to conform to the sides of the new sheet.
  • a different cap 26 having an opening 27b of the desired diameter would be substituted for that used in the set-up illustrated.
  • the substituted sheet 14 would be formed into a tube 15 having the slightly smaller diameter.
  • the limits within which this can be achieved are determined by the necessity of the rolls 17-20 to significantly curl the edge areas of the sheet and the avoidance of too great a taper in that portion of the opening 27 lying within cap 26.
  • the horn should be sufficiently long to result in a gradual bending of the edge-curved strip into the finished cylindrical form. An effort to cause an abrupt transition in this respect will result in difficulties. To avoid this, the horn should have a length substantially greater than the width of the strip to be formed, i.e., at
  • a method of forming an elongated flat strip of metal having opposed faces between two edges substantially into an elongated cylinder comprising the steps of:
  • the subsequent component being in the form of a horn having a relatively flat curvature at the entrance end and an exit end of approximately said given diameter, means on the interior of said horn defining a non-galling surface.
  • said pressure means is a roller which contacts the concave face of the strip.
  • said pressure means is a transverse bar which contacts one or the other edges of the strip depending upon the orientation of the strip in the horn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00046876A 1970-06-17 1970-06-17 Tube forming method and apparatus Expired - Lifetime US3722248A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4687670A 1970-06-17 1970-06-17

Publications (1)

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US3722248A true US3722248A (en) 1973-03-27

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US00046876A Expired - Lifetime US3722248A (en) 1970-06-17 1970-06-17 Tube forming method and apparatus

Country Status (4)

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US (1) US3722248A (enrdf_load_stackoverflow)
CA (1) CA946222A (enrdf_load_stackoverflow)
DE (1) DE2128413A1 (enrdf_load_stackoverflow)
GB (1) GB1305677A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339938A (en) * 1978-05-02 1982-07-20 Nippon Steel Corporation Method and apparatus for forming metal pipes and tubes
US4603807A (en) * 1984-06-01 1986-08-05 Allied Tube & Conduit Corporation Mill for roll forming a fluted tube
WO2013091973A1 (de) * 2011-12-20 2013-06-27 Witzenmann Gmbh MODULARE ROHRSCHWEIßVORRICHTUNG UND VERFAHREN ZUR HERSTELLUNG EINES ROHRES
CN104028596A (zh) * 2014-05-23 2014-09-10 宁波赛乐福板材成型技术有限公司 板材连续渐近成型装置
CN110732752A (zh) * 2018-07-20 2020-01-31 广州南洋电缆有限公司 一种偏弧纠正系统

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2805735C3 (de) * 1978-02-09 1982-02-18 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zur Herstellung längsnahtgeschweißter Rohre durch Kalteinformen von Bändern
RU2270731C1 (ru) * 2004-08-09 2006-02-27 Общество с ограниченной ответственностью "Русские карнизы" Оправка для обжатия труб с внутренним фальцевым швом
RU2276627C1 (ru) * 2004-09-28 2006-05-20 Общество с ограниченной ответственностью "Русские карнизы" Профилегибочный стан
DE102008063385B4 (de) * 2008-12-30 2013-08-14 Getrag Ford Transmissions Gmbh Kupplungssupport

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187374A (en) * 1915-05-14 1916-06-13 Herman Nowak Machine for shaping metal troughs and tubes.
US1190351A (en) * 1915-08-20 1916-07-11 M J Ford Machine for lock-joining tubes.
US1746281A (en) * 1927-07-26 1930-02-11 Union Metal Mfg Co Apparatus for and method of making tapered tubular poles
US3001569A (en) * 1958-04-29 1961-09-26 Flexonics Corp Tube forming tool
US3236083A (en) * 1963-02-06 1966-02-22 Continental Can Co Conical strip shaping apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187374A (en) * 1915-05-14 1916-06-13 Herman Nowak Machine for shaping metal troughs and tubes.
US1190351A (en) * 1915-08-20 1916-07-11 M J Ford Machine for lock-joining tubes.
US1746281A (en) * 1927-07-26 1930-02-11 Union Metal Mfg Co Apparatus for and method of making tapered tubular poles
US3001569A (en) * 1958-04-29 1961-09-26 Flexonics Corp Tube forming tool
US3236083A (en) * 1963-02-06 1966-02-22 Continental Can Co Conical strip shaping apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339938A (en) * 1978-05-02 1982-07-20 Nippon Steel Corporation Method and apparatus for forming metal pipes and tubes
US4603807A (en) * 1984-06-01 1986-08-05 Allied Tube & Conduit Corporation Mill for roll forming a fluted tube
WO2013091973A1 (de) * 2011-12-20 2013-06-27 Witzenmann Gmbh MODULARE ROHRSCHWEIßVORRICHTUNG UND VERFAHREN ZUR HERSTELLUNG EINES ROHRES
CN104028596A (zh) * 2014-05-23 2014-09-10 宁波赛乐福板材成型技术有限公司 板材连续渐近成型装置
CN104028596B (zh) * 2014-05-23 2016-01-06 宁波赛乐福板材成型技术有限公司 板材连续渐近成型装置
CN110732752A (zh) * 2018-07-20 2020-01-31 广州南洋电缆有限公司 一种偏弧纠正系统

Also Published As

Publication number Publication date
GB1305677A (enrdf_load_stackoverflow) 1973-02-07
CA946222A (en) 1974-04-30
DE2128413A1 (de) 1971-12-23

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