US2816356A - Method of making tube - Google Patents

Method of making tube Download PDF

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Publication number
US2816356A
US2816356A US521991A US52199155A US2816356A US 2816356 A US2816356 A US 2816356A US 521991 A US521991 A US 521991A US 52199155 A US52199155 A US 52199155A US 2816356 A US2816356 A US 2816356A
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US
United States
Prior art keywords
tube
strip
bonding metal
interfaces
elongate
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
Application number
US521991A
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English (en)
Inventor
Raymond H Hobrock
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.)
Bundy Tubing Co
Original Assignee
Bundy Tubing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bundy Tubing Co filed Critical Bundy Tubing Co
Priority to US521991A priority Critical patent/US2816356A/en
Priority to ES0226985A priority patent/ES226985A1/es
Application granted granted Critical
Publication of US2816356A publication Critical patent/US2816356A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
    • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes

Definitions

  • the tube is subjected to a heat treatment to melt the' bonding metal-.
  • the principal difficulty encountered is that tubing so fashioned and which is round in cross section twists on its axi's; This is due apparently to different metal conditions as to relative hardness and softness and to various strains set up in the metal. As a result, the seam' running lengthwise of the tube changes its position.
  • the strip or wire of bonding metal When the strip or wire of bonding metal is rendered molten, it gravitates to the bottom of the tube, and if the seam is at the bottom of the tube, the bonding metal will iiow between the interfaces to unite the interfacesy upon solidication. However, if the tube twists so that in different longitudinal increments of the-tube the seam is displaced upwardly from the bottom of the tube, the molten metal cannot iiow in between the interfaces.
  • the tubing is made inan inverted manner so that the seam is normally positioned lowermost. And furthermore, the tube is fashioned into a non-circular form in cross section so that it canbe guided and held in a position with the seam at the lower portionof the tube so that molten metal may iiow in. between the interfaces.
  • the tubing thus formed in an inverted manner is fashioned so that it is of elongate form in cross section with the long axis disposed substantially vertically and the short axis disposed substantially horizontally.
  • the tubing is preferably subjected to a treatment to give it a substantially round or circular form in cross section.
  • Fig. 1 is a general View indicating an apparatus s well as method for fashioning the tube in accordance with the invention with continuous lengthwise movement of the strip through a tube forming mill, a heating zone, ay cooler, and arounding unit.
  • Fig. 2 is a cross sectional view taken substantially on line 2--2 of Fig. 1 illustrating an early stage of the fashioning of the strip.
  • Fig. 3 is a cross -sectional view taken substantially on lin'e -3-3 of Fig. 1 showingy nal forming rolls.
  • Fig 4v is a cir-oss sectional view taken oriy line 4-4 of Fig.y 'l showing theftube as formed.
  • Fig. 6 is a sectional view takenon line 6--6 ofaFig, 1 ⁇ illustrating sizing and rounding rolls.
  • Fig.Y 7y is a view illustrating a furnace through which a plurality of tubes may be passedffor heatingthe same.
  • Fig. 8 is an enlarged-sectional View taken substantial ly on line 8 8 ofFig. 7y illustrating a guide pipe inithe furnace.
  • the strip 1 is drawnv fromM a supply coil 2 andit is passedwith lengthwise movement through a tube mill 4.
  • the tube mill has forming rolls which fashions the strip transversely into hollow cross sectionall form.
  • the strip is formed about Va mandrell 6 (Fig. 2), which is held by a bracket 8.
  • This mandrel is hollow and a strip. or wire 10 ofbonding metal. is drawn from a supply roll -11 and' fed into the mandrel.
  • Fig. 2 an early stage of the formation of the strip is indicated as well also as-the mandrel and the bonding metal within the vhollow mandrel.
  • the strip is ⁇ preferably of steel and the bonding metal preferably of cop'- per.
  • other metals may be employed:
  • steel strip may be used ⁇ V with a bonding metalof solder, either hard or soft solder; the strip maybe Monel metal" with an appropriate bonding metal.-
  • T he tube mill may be one of rather conventional form but' the rolls are grooved to form the strip intoelon# gate' hollow cross sectionalshape.
  • the final rolls of the tubernill are shown at 15 and-16 andv itwill be seen in Fig. 3- that the mandrel has an elongate cross sectional form-andV that the rollsV 15 and -16' are grooved so as to form or wrap the metal of the strip with the elongate cross sectional form.
  • the tube illustrated' is one fashioned froml a single strip of stock wherein the stock is rolled or fashioned through about 720 with the ⁇ edges thereof bevelled or scarfed and' fittedagainst an offset in the intermediateportion ofthe strip.v
  • the t-ube is generally illustrated at T in Fig.
  • the outsider edge-raft 17 and the inside edge at 18' The inner and outer pliesof the tube are formedI in tight interfacial enga-gement and the llocation where the edges 17. and 18 engage 'opposite sidesl of the intermediate part ofthe strip maybe considered the seam.
  • the interfaces between the body of the strip and the edge 18 intersect theinner lsurface of the tube. The tube thus kformed can be guided' and held so that the seam is held lowemiost or, in7 other words, at the lower terminal of the long axis.
  • Fig. 1 the strip -and-l tube are moved continuously and as the tube emerges from the tube mill it enters ahe'ating zone.
  • This may bel in the form of a housing. 20" into which a non-oxidizing or reducing gas may beV entered through a pipe 21.
  • This heating zone is 'of the electrical resistance variety.
  • a transformer has a' primary 33 connectedv to ⁇ a suitable source of electrical current.
  • One side of the secondary Z8 is connected to the electrode roller 23 by a conductor 30.
  • the other side of the secondary is connected to the" electrode 22 by a conductor 31 ⁇ and to the electrode 24 by a conductor 32.
  • The' metal will not iloW out from-between the'inter'f'aeesf 3 which intersect the outer surface of the tube at the edge 17 because the caoillarv snare ceases at that point.
  • the tube leaves the heating zone and enters a cooler generallv indicated at 35.
  • This cooler is preferably of the iacketed tvoe having an outer casing 36. and an inner casing 37. through which the tube travels.
  • the inner tube or iacket 37 mav be shaped, particularly for a portion of its length. to guide the tube and hold the seam down.
  • Coolingl water may be passed between the iackets and may bei introduced through a pine 40 and discharged from pipe 41.
  • the gas introduced through the pipe 21 may flow both upstream and downstream with some of the gas burning oft ⁇ at the inlet to the heating chamber and some discharging from the outlet end of the cooler.
  • a sizing and rounding unit generally illustrated at 44. It comprises a series of suitably formed rolls which engage the tube and change its elongate cross sectional form into rounded form. The final rolls are indicated at 45 and 46 and the tube is given a circular or rounded form as indicated in Fig. 6.
  • the strip moves successively through the forming mill, the heating zone, the cooler, and the rounding and sizing unit.
  • the strip may move at fairly high speed because it can be rapidly heated by electrical resistance.
  • the method may be carried out by separating the heating unit and cooling unit from the tube mill and rounding unit.
  • a suitable furnace is shown in Fig. 7 at 50 through which a plurality of tubes may be simul taneously passed.
  • the tubes may be fed into the furnace by driving rollers 51 and S2.
  • the furnace is suitably heated to raise the temperature of the tubes and melt the copper ⁇ inside the same.
  • the furnace may be supplied with a non-oxidizing or reducing gas through an inlet pipe 55 and this gas may escape from the inlet of the furnace and the outlet of the cooler.
  • the furnace is provided with a guide pipe for each tube.
  • a guide pipe for each tube.
  • Such a guide pipe is shown in Fig. 8 at 56. It will be noted that the guide pipe is of elongate form 1n cross section to more or less fit the tube.
  • the tube mill is separated from the furnace and tubes are formed rapidly thereby and cut into lengths. A plurality of the tubes are passed simultaneously through the furnace 50.
  • the tubes pass through the furnace ft much slower than they are made in the tube mill but by passing a plurality of tubes simultaneously through the furnace, the overall output of the furnace may substantially correspond to the ⁇ output of the tube mill.
  • the tube of elongate form lin cross section can be held with facility so that the seam is maintained lowermost.
  • the wire or strip of bonding metal is rendered molten, it has access to the interfaces where the interfaces intersect the inside surface of the tube.
  • thc electrodes and the back up rollers serve to hold the tube in proper position.
  • the respective guide pipes hold the tubes in proper position. It is not necessary to the invention that the seam in all increments of the tube remain accurately at the lower terminal of the long axis of the elongate form.
  • the method of making tube from strip metal stock comprising, moving the strip lengthwise, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, bringing the edges of the strip into proximity with each other and with interfacing portions substantially at the lower terminal of the long axis, feeding a strip ofbonding metal into the tube interior as it is being formed, passing the tube through a heating zone to melt the bonding metal, while utilizing the elongate form of the tube as a guide means for maintaining said edges substantially at the lower terminal part of the long axis, whereby the molten bonding metal, which gravitates to the lower portion of the elongate form, flows by capillarity between the interfaces, and cooling the tube to solidify the bonding metal and unite the interfaces.
  • the method of making tube from strip metal stock comprising, moving the strip lengthwise, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, bringing the edges of the strip into proximity with each other and with interfacing portions substantially at the lower terminal of the long axis, feeding a strip of bonding metal into the tube interior as it is being formed, passing the tube through a heating zone to melt the' bonding metal, while utilizing the elongate form of the tube as a guide means for maintaining said edges substantially at the lower terminal part of the long axis, whereby the molten bonding metal, which gravitates to the lower portion of the elongate form, flows by capillarity between the interfaces, cooling the tube to solidify the bonding metal and unite the interfaces, then treating the tube to change the elongate cross sectional form to a substantially round form.
  • the method of making tube with a double thickness wall from strip metal stock which comprises, moving the strip stock lengthwise, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, and with inner and outer plies in interfacial relationship, bringing edge portions of the strip stock into proximity with each other substantial at the lower terminal of the long axis, feeding a strip of bonding metal into the tube interior as it is being formed, passing the tubethrough a heating zone to melt the bonding metal, while guiding the tube through the agency of its elongate fornito maintain said edges substantially at the lower ⁇ terminal of the long axis, whereby the molten bonding metal, which gravitates to the lower portion of the elongate form, flows by capillarity 'between the interfaces, cooling the tube to solidify the bonding metal and unite the interfaces, then treating the tube to change the elongate cross sectional form to a substantially round form.
  • the method of making tube with a double thickness wall from a single strip of steel stock which comprises, moving the strip lengthwise, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, and with inner and outer plies in interfacial relationship, bringing the edges of the strip into proximity with each other on opposite sides of the intermediate part of the strip and substantially at the lower terminal of the long axis, feeding a strip of copper into the tube interior as it is being formed, passing the tube through a heating zone to melt the copper while utilizing the elongate form of the tube to guide the tube to maintain said edges substantially at the lower terminal of the long axis, whereby the molten copper which gravitates to the lower portion of the elongate form, ows by capillarity between the interfaces, cooling the tube to solidify the copper and unite the interfaces, and then treating the tube to change the elongate cross sectional form to a substantially round form.
  • the method of making tube from strip metal stock comprising, moving the strip lengthwise, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, bringing the edges of the strip into proximity with each other and with interfacing portions substantially at the lower terminal of the long axis, feeding a strip of bonding metal into the tube interior as it is being formed, passing the tube with continuous movement through a heating zone to melt the bonding metal, while maintaining said edges substantially at the lower terminal part of the long axis by utilizing the elongate form of the tube as a guide means, whereby the molten bonding metal, which gravitates to the lower portion of the elongate form, ows by capillarity between the interfaces, cooling the tube to solidify the bonding metal and unite the interfaces, then treating the tube to change the elongate cross sectional form to a substantially round form.
  • the method of making tube from strip metal stock which comprises, fashioning the strip into tubing of elongate form in cross section with the long axis disposed substantially vertically, bringing the edges of the strip into proximity with each other substantially at the lower terminal of the long axis to form interfacial portions, placing a strip of bonding metal into the tube interior, passing the tube through a heating zone to melt the bonding metal, while utilizing the elongate form of the tube for guiding the tube to maintain said edges substantially at the lower terminal of the long axis, whereby the molten bonding metal, which gravitates to the lower portion of the elongate form, flows by capillarity between the interfaces, cooling the tube to solidify the bonding metal and unite the interfaces, and then treating the tube to change the elongate cross sectional form to a substantially round form.
  • the method of making tube from strip metal stock comprising, moving the strip lengthwise and fashioning it into tubing of acircular cross section with the strip edges in proximity with each other to form a seam area having interfaces generally at the lowermost portion of the tube, introducing a body of bonding metal into the tube interior ⁇ as it is being formed and, while utilizing the acircular shape of the tube as a guide means to maintain said seam area generally at its lowermost portion, passing the tube through a heating zone to melt the bonding metal, so that the molten bonding metal g-ravitates to the seam area and flows by capillarity between the interfaces, and cooling the tube to solidify the bonding metal and unite the interfaces.
  • the method of making tube from strip metal stock comprising, moving the strip lengthwise and fashioning it into tubing of acircular cross section with the strip edges in proximity with each other to form a seam area having interfaces generally at the lowermost portion of the tube, the slope of the portions of the tube wall adjacent said seam area being relatively greater than that of the tube in its finished form, introducing a body of bonding metal into the tube interior as it is being formed, and, while utilizing the acircular shape of the tube as a guide means to maintain said seam area generally at its lowermost portion, passing the tube through a heating zone to melt the bonding metal, so that the molten bonding metal gravitates to the seam area and flows by capillarity between the interfaces, with said portions of the tube wall adjacent said seam area forming a trough facilitating such flow to said seam area, cooling the tube to solidify the bonding metal and unite the interfaces, and treating the tube to decrease said slope of said wall portions and to change the acircular cross sectional form to a substantially round form.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US521991A 1955-07-14 1955-07-14 Method of making tube Expired - Lifetime US2816356A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US521991A US2816356A (en) 1955-07-14 1955-07-14 Method of making tube
ES0226985A ES226985A1 (es) 1955-07-14 1956-02-29 UN PROCEDIMIENTO DE FABRICACIoN DE TUBOS, PARTIENDO DE TIRAS METáLICAS

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US521991A US2816356A (en) 1955-07-14 1955-07-14 Method of making tube

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975087A (en) * 1957-09-03 1961-03-14 Electrarc Inc Method and apparatus for making shielded wire
DE1122916B (de) * 1958-06-16 1962-02-01 Gen Motors Corp Verfahren zum Herstellen von geloeteten, an ihrer inneren Oberflaeche mit einer NE-Metallschicht bedeckten Stahlrohren aus Band
DE1125867B (de) * 1958-06-16 1962-03-22 Gen Motors Corp Verfahren zum Herstellen von geloeteten, an ihrer inneren Oberflaeche mit einer NE-Metallschicht bedeckten Stahlrohren
US3029914A (en) * 1958-11-25 1962-04-17 Macomber Inc Laminated tubular section structural members
US3158181A (en) * 1959-05-11 1964-11-24 Gore & Ass Polymeric tubate product and process
US3474522A (en) * 1967-05-10 1969-10-28 Anaconda American Brass Co Method for changing the width of a strip metal and for forming tubes therefrom

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210338A (en) * 1938-07-30 1940-08-06 Bundy Tubing Co Method of making tubes
US2234450A (en) * 1938-10-14 1941-03-11 Bundy Tubing Co Method for making tubes
US2255472A (en) * 1938-02-28 1941-09-09 Bundy Tubing Co Tube and method of making tube
US2618845A (en) * 1946-04-15 1952-11-25 Bert L Quarnstrom Method of making tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255472A (en) * 1938-02-28 1941-09-09 Bundy Tubing Co Tube and method of making tube
US2210338A (en) * 1938-07-30 1940-08-06 Bundy Tubing Co Method of making tubes
US2234450A (en) * 1938-10-14 1941-03-11 Bundy Tubing Co Method for making tubes
US2618845A (en) * 1946-04-15 1952-11-25 Bert L Quarnstrom Method of making tubes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975087A (en) * 1957-09-03 1961-03-14 Electrarc Inc Method and apparatus for making shielded wire
DE1122916B (de) * 1958-06-16 1962-02-01 Gen Motors Corp Verfahren zum Herstellen von geloeteten, an ihrer inneren Oberflaeche mit einer NE-Metallschicht bedeckten Stahlrohren aus Band
DE1125867B (de) * 1958-06-16 1962-03-22 Gen Motors Corp Verfahren zum Herstellen von geloeteten, an ihrer inneren Oberflaeche mit einer NE-Metallschicht bedeckten Stahlrohren
US3029914A (en) * 1958-11-25 1962-04-17 Macomber Inc Laminated tubular section structural members
US3158181A (en) * 1959-05-11 1964-11-24 Gore & Ass Polymeric tubate product and process
US3474522A (en) * 1967-05-10 1969-10-28 Anaconda American Brass Co Method for changing the width of a strip metal and for forming tubes therefrom

Also Published As

Publication number Publication date
ES226985A1 (es) 1956-04-16

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