US3487673A - Form drawing of fluted tubing - Google Patents

Form drawing of fluted tubing Download PDF

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Publication number
US3487673A
US3487673A US620814A US3487673DA US3487673A US 3487673 A US3487673 A US 3487673A US 620814 A US620814 A US 620814A US 3487673D A US3487673D A US 3487673DA US 3487673 A US3487673 A US 3487673A
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US
United States
Prior art keywords
section
die
tubing
fluted
mandrel
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
US620814A
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English (en)
Inventor
Charles J House
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.)
WOLVERINE ACQUISITION CORP A DE CORP
Bank of Nova Scotia
CALUMET AND HECLA CORP
Original Assignee
CALUMET AND HECLA CORP
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 CALUMET AND HECLA CORP filed Critical CALUMET AND HECLA CORP
Application granted granted Critical
Publication of US3487673A publication Critical patent/US3487673A/en
Anticipated expiration legal-status Critical
Assigned to BANK OF NOVA SCOTIA, THE reassignment BANK OF NOVA SCOTIA, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WOLVERINE ACQUISITION CORP. A CORP. OF DE
Assigned to WOLVERINE ACQUISITION CORP., A DE CORP reassignment WOLVERINE ACQUISITION CORP., A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WOLVERINE TUBE, INC.,
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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D15/00—Corrugating tubes
    • B21D15/02—Corrugating tubes longitudinally
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels

Definitions

  • tubing is drawn and fluted simultaneously in a manner which permits the formation of flutes of relatively great depth or height and at the same time provides an accurate control both of the inside diameter and outside diameter of the tubing at all points around its circumference, as well as an accurate control of wall thickness.
  • This is accomplished basically by employing a compound die having a first section shaped to provide relatively shallow flutes in the tubing extending radially inwardly from its original cylindrical configuration, and a second or following fluted section having a tapered throat and provided with flutes dimensioned to provide the required outside dimension of the tubing.
  • a compound mandrel conforming to the die sections is provided.
  • FIGURE 1 is an elevational view of a section of tubing showing the stages in its production.
  • FIGURE 2 is a transverse sectional view through the completed fluted tubing.
  • FIGURE 3 is a longitudinal section through the compound die and mandrel assembly, taken substantially on the line 3-3, FIGURE 4.
  • FIGURE 4 is a sectional view on the broken line 4-4, FIGURE 3.
  • FIGURE 1 there is shown an elevational view of a portion of a tube T.
  • the drawing operation was terminated with the tubing in the die and the partially shaped and drawn tubing withdrawn.
  • the tubing has a plain cylindrical section 10 and at the extreme right end, as indicated at 12, it is deeply fluted as indicated at 14, and in addition is of substantially reduced diameter.
  • the partially fluted tubing tapers through a zone 16.
  • the flutes are initially formed in a cylindrical portion of the tubing by displacing material radially inwardly to form inwardly extending partially formed flutes without appreciable reduction in the major diameter of the tubing.
  • FIGURE 2 shows dimensions of specific longitudinally fluted tubing having flutes 20 intermediate adjacent outwardly extending ribs 22, the flutes forming internally extending ribs 24 and the tubing having a major diameter measured to the crests of the outwardly extending ribs of approximately 1.500 inches, a minor inside diameter measured to the crests of the inwardly extending ribs of approximately 1.150 inches, giving an approximate flute height measured from the crests of the outwardly extending ribs to the crests of the inwardly extending ribs of approximately .175 inch, and having a wall thickness of .032 inch.
  • This fluted tubing may be produced in accordance with the present invention from 2 /2 inch OD. x .032 wall, from -30 copper nickel tubing. In the specific example given sixteen flutes are provided but of course the number of flutes may be varied as required.
  • FIGURE 3 there is illustrated at 30 a compound die which is supported in a die block of conventional arrangement, and associated with the die 30 is a compound mandrel 32 supported in the throat of the compound die by suitable means such as the mandrel support rod 34.
  • the first stage of the compound die comprises a ring 36 having a plurality of radially extending cylindrical openings 38 corresponding to the number of flutes to be formed in the tubing.
  • Received in cylindrical openings 38 are short lengths 40 of cylindrical material such for example as drill rods, the radially inner ends of the rods being cylindrically rounded as indicated at 42.
  • the drill rods are accurately adjusted to have their required inward extension and are clamped in position by suitable means such as set screws 44.
  • annular locating collar 46 At the downstream side of the ring 36 there is provided an annular locating collar 46 for purposes which will presently appear.
  • a mounting and assembly ring 48 Surrounding the ring 36 is a mounting and assembly ring 48 provided with openings 50 through which extend assembly screws 52. Received beneath the heads 54 of the assembly screws 52 are washers 56, the radially inner edges of which overlies the ring 36 and which are adapted to clamp the ring in circumferentially adjusted position to provide for proper alignment between the flute forming surfaces provided by the rods and the flute forming 3 surfaces provided in the second section of the compound die.
  • the second section of the compound die is indicated at 58 and has threaded openings 60 for the reception of screws 52.
  • die section 58 is recessed as indicated at 62 to receive the collar 46 which constitute piloting means which retains the die sections 36 and 58in properly aligned position.
  • the inner surface of the die section 36 is cylindrical as best seen at 64, the fluting in this section being accomplished by the radially inwardly protruding ends of the rods 40.
  • the second die section 58 has a tapered throat indicated generally at 66, the downstream section of the die being relatively deeply fluted and including a final flute forming section 67 of substantially uniform cross-section.
  • the compound mandrel indicated generally at 32 comprises the final flute forming portion 68 which is generally of uniform deeply fluted cross-section fitting accurately within the fluted section 67 through the die section 58.
  • This mandrel section extends from an internally threaded connector 70 in which the mandrel rod 34 is threaded.
  • Mounted on the mandrel is a preliminary flute forming section 76.
  • This section may be formed of any suitable material, but excellent results are obtained when it is formed of nylon.
  • the initial flute forming mandrel section 76 includes a collar 78 and may abut against an annular shoulder 79 on the final flute forming mandrel portion 68 or connector 70, and which may be retained in circumferentially aligned position thereon by suitable means such as a set screw 80.
  • an end of the relatively large tubing is first pointed and inserted through the compound die and connected to means for drawing the tubing through the die.
  • the tubing is given an initial fluting of appreciable depth without however substantially reducing its outside diameter.
  • the partially fluted tubing engages the tapered throat of the die section 58 at which time the tubing is sunk to approximately the required inside and outside diameter, and at the same time the flutes engage the corresponding fluted portions 67 of the die and 68 of the mandrel.
  • the invention is of course particularly applicable to the formation of deeply fluted tubing of relatively thin wall section as for example, between .020 and .050 inch.
  • the method involves the application of the compound drawing steps to tubing of substantially greater initial diameter than the final average diameter of the fluted tube.
  • the initial diameter of prime tubing was 2% inch OD.
  • the approximate average effective diameter (midway between the inside and outside diameter) of the final fluted tubing was approximately 1.222 inches. It will be observed that this represents a reduction to approximately half the initial dimension.
  • a method of forming deeply fluted thin wall tubing which comprises initially progressively forming longitudinally extending flutes in said tubing intermediate outwardly projecting ribs primarily by progressive bending of the tube wall without substantial reduction in maximum outside tube diameter, and thereafter progressively substantially reducing the outside diameter of the tubing and deepening and shaping the flutes to required dimensions, producing the initial flute formations by drawing the tubing through an annular space defined between a first die having inwardly projecting flute forming portions provided with rounded ends, and a first fluted mandrel conforming to the rounded ends of the flute forming portions and spaced therefrom an amount substantially equal to the initial wall thickness of the tubing, and deepening and shaping the flutes by drawing the tubing through a substantially smaller annular space defined between a second die having a fluted opening provided with longitudinally converging rib and groove formations and with straight rib and groove formations parallel to the axis of the dies, and a second fluted mandrel having straight rib and groove formations parallel to the dies
  • Fluting die structure comprising a compound die having a first annular die section having an opening therethrough with an entrance and an exit end and provided with radially inwardly extending flute forming projections, a first fluted mandrel section within the opening through said first annular die section, said first mandrel section having alternated ribs and grooves extending parallel to the axis of the die, said die structure having a second annular die section directly adjacent said first die section and having an opening therethrough with an entrance and an exit end and being in aligment with the opening through said first die section, the opening through said second die section being shaped to provide adjacent the entrance end thereof a tapered throat having longitudinally converging rib and groove formations and adjacent the exit end thereof a straight flute forming portion comprising alternated ribs and grooves parallel to the axis of the die extending from said throat to the exit end of the opening through said second die section, the maximum diameter of the exit end of the opening through the second die section being substantially smaller than the exit end of the opening through said first
  • said first die section comprises an annular body having radial openings, radially adjustable rods in said openings, said rods having flute forming rounded ends projecting into the opening through said first die section in alignment with the grooves in said first mandrel section.
  • said first mandrel section being an externally fluted, annular body of a resin such as nylon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Metal Extraction Processes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US620814A 1967-03-06 1967-03-06 Form drawing of fluted tubing Expired - Lifetime US3487673A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62081467A 1967-03-06 1967-03-06

Publications (1)

Publication Number Publication Date
US3487673A true US3487673A (en) 1970-01-06

Family

ID=24487505

Family Applications (1)

Application Number Title Priority Date Filing Date
US620814A Expired - Lifetime US3487673A (en) 1967-03-06 1967-03-06 Form drawing of fluted tubing

Country Status (6)

Country Link
US (1) US3487673A (xx)
BE (1) BE701826A (xx)
DE (1) DE1602249A1 (xx)
FR (1) FR1532197A (xx)
GB (1) GB1131585A (xx)
SE (1) SE329986B (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566300A (en) * 1982-03-26 1986-01-28 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member
EP0295919A2 (en) * 1987-06-19 1988-12-21 The Babcock & Wilcox Company Cold drawing technique and apparatus for forming internally grooved tubes
WO1990005598A1 (en) * 1988-11-22 1990-05-31 Tatarsky Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Neftyanoi Promyshlennosti Method and device for making profiled pipes used for well construction
US5809822A (en) * 1995-01-25 1998-09-22 Butty; Jean-François Method of producing a metallic hollow body with a breaking line
US20130340880A1 (en) * 2012-06-22 2013-12-26 Lucio Carretta Method And Apparatus For Fabricating A Metal Pipe Having At Least One Smooth Portion And At Least One Grooved Portion
US20150101828A1 (en) * 2013-10-11 2015-04-16 Schlumberger Technology Corporation Tube Forming Device
USD966726S1 (en) * 2021-01-27 2022-10-18 Inter Ikea Systems B.V. Step stool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1129074B (it) * 1980-04-16 1986-06-04 Metalli Ind Spa Apparecchiatura per formare a punta l estremita di un tubo metallico mediante un operazione di trafilatura
GB2136335B (en) * 1983-03-09 1986-04-16 Packless Metal Hose Inc Tube corrugating apparatus and method
DE3807002C1 (xx) * 1988-03-01 1989-04-27 Mannesmann Ag, 4000 Duesseldorf, De
FR2705257B1 (fr) * 1993-05-21 1995-08-11 Lorraine Laminage Récipient métallique notamment en acier du type boîte de conserve et procédé de fabrication d'un tel récipient.

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE108193C (xx) *
US519086A (en) * 1894-05-01 Carl gustaf larson
US545067A (en) * 1895-08-27 Und stahlwerke
DE522161C (de) * 1928-06-13 1931-04-01 Max Bittersmann Einrichtung zum Kaltziehen von Metallrohren
US1962804A (en) * 1930-10-03 1934-06-12 American Fork & Hoe Co Method of making golf clubs
US1967487A (en) * 1930-03-20 1934-07-24 Mechanics Universal Joint Comp Method and apparatus for making propeller shafts
US1979430A (en) * 1932-03-19 1934-11-06 American Fork & Hoe Co Method of forming shafts for golf clubs
US1983074A (en) * 1931-06-11 1934-12-04 American Fork & Hoe Co Method of making golf club shafts
US2001643A (en) * 1930-10-03 1935-05-14 American Fork & Hoe Co Method of forming golf shafts and the like
US2055771A (en) * 1933-04-18 1936-09-29 Aluminum Co Of America Method of making shafts
US3155229A (en) * 1961-06-30 1964-11-03 Avesta Jernverks Ab Drawing mandrel

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE108193C (xx) *
US519086A (en) * 1894-05-01 Carl gustaf larson
US545067A (en) * 1895-08-27 Und stahlwerke
DE522161C (de) * 1928-06-13 1931-04-01 Max Bittersmann Einrichtung zum Kaltziehen von Metallrohren
US1967487A (en) * 1930-03-20 1934-07-24 Mechanics Universal Joint Comp Method and apparatus for making propeller shafts
US1962804A (en) * 1930-10-03 1934-06-12 American Fork & Hoe Co Method of making golf clubs
US2001643A (en) * 1930-10-03 1935-05-14 American Fork & Hoe Co Method of forming golf shafts and the like
US1983074A (en) * 1931-06-11 1934-12-04 American Fork & Hoe Co Method of making golf club shafts
US1979430A (en) * 1932-03-19 1934-11-06 American Fork & Hoe Co Method of forming shafts for golf clubs
US2055771A (en) * 1933-04-18 1936-09-29 Aluminum Co Of America Method of making shafts
US3155229A (en) * 1961-06-30 1964-11-03 Avesta Jernverks Ab Drawing mandrel

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566300A (en) * 1982-03-26 1986-01-28 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member
US4662143A (en) * 1982-03-26 1987-05-05 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member, and a member manufactured according to the method
EP0295919A2 (en) * 1987-06-19 1988-12-21 The Babcock & Wilcox Company Cold drawing technique and apparatus for forming internally grooved tubes
EP0295919A3 (en) * 1987-06-19 1989-11-23 The Babcock & Wilcox Company Cold drawing technique and apparatus for forming internally grooved tubes
WO1990005598A1 (en) * 1988-11-22 1990-05-31 Tatarsky Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Neftyanoi Promyshlennosti Method and device for making profiled pipes used for well construction
US5119661A (en) * 1988-11-22 1992-06-09 Abdrakhmanov Gabdrashit S Apparatus for manufacturing profile pipes used in well construction
US5809822A (en) * 1995-01-25 1998-09-22 Butty; Jean-François Method of producing a metallic hollow body with a breaking line
US20130340880A1 (en) * 2012-06-22 2013-12-26 Lucio Carretta Method And Apparatus For Fabricating A Metal Pipe Having At Least One Smooth Portion And At Least One Grooved Portion
US9573180B2 (en) * 2012-06-22 2017-02-21 Lucio Carretta Method and apparatus for fabricating a metal pipe having at least one smooth portion and at least one grooved portion
US20150101828A1 (en) * 2013-10-11 2015-04-16 Schlumberger Technology Corporation Tube Forming Device
USD966726S1 (en) * 2021-01-27 2022-10-18 Inter Ikea Systems B.V. Step stool

Also Published As

Publication number Publication date
SE329986B (xx) 1970-11-02
GB1131585A (en) 1968-10-23
BE701826A (xx) 1968-01-25
DE1602249A1 (de) 1970-08-06
FR1532197A (fr) 1968-07-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BANK OF NOVA SCOTIA, THE, 44 KING STREET, WEST, TO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WOLVERINE ACQUISITION CORP. A CORP. OF DE;REEL/FRAME:004696/0897

Effective date: 19870313

AS Assignment

Owner name: WOLVERINE ACQUISITION CORP., A DE CORP,DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WOLVERINE TUBE, INC.,;REEL/FRAME:004728/0083

Effective date: 19870318

Owner name: WOLVERINE ACQUISITION CORP., CORPORATION TRUST CEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WOLVERINE TUBE, INC.,;REEL/FRAME:004728/0083

Effective date: 19870318