US3813910A - Method and apparatus for making tubing from metal tape - Google Patents

Method and apparatus for making tubing from metal tape Download PDF

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Publication number
US3813910A
US3813910A US00280483A US28048372A US3813910A US 3813910 A US3813910 A US 3813910A US 00280483 A US00280483 A US 00280483A US 28048372 A US28048372 A US 28048372A US 3813910 A US3813910 A US 3813910A
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United States
Prior art keywords
tape
strip
tube
axis
tabs
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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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US00280483A
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English (en)
Inventor
K Muller
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.)
Kabelmetal Electro GmbH
KM Kabelmetal AG
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KM Kabelmetal AG
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Publication date
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Publication of US3813910A publication Critical patent/US3813910A/en
Assigned to KABELMETAL ELECTRO GMBH, KABELKAMP 20, 3000 HANNOVER 1, GERMANY reassignment KABELMETAL ELECTRO GMBH, KABELKAMP 20, 3000 HANNOVER 1, GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KABEL- UND METALLWERKE GUTEHOFFNUNGSHUTTE AG
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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • H01B13/262—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping of an outer metallic screen

Definitions

  • ABSTRACT Thin metal tape or strip is longitudinally folded into tubular form by means of a conical die with conical mandrel. The tape or strip is slightly bent temporarily just prior to folding so that the resulting convex side of the tape or strip becomes the inner tube surface. The tube is formed to have radial tabs which are trimmed and welded. The resulting tube is consistently impervious to fluid.
  • the present invention relates-to improvements in forming and shaping a longitudinally paid metal tape into tubular form with radial tabs formed from the edges of the tape.
  • Metal tape or strip used as stock has thickness not exceeding 0.3 millimeters and theraglial tabs have adjoining disposition so that they can be welded or soldered for closing the tube.
  • Electrical cables are known to have a core which is enveloped in a tubular sheathing.
  • the sheathing is constructed in that the cable core is enveloped in longitudinally paid-in metal tape or strip having wall thickness not exceeding 0.3 millimeters and having width larger than the circumference of the resulting tube. Radially.
  • tabs are formed from marginal portions of the tape or strip, which tabs run parallel to the axis of tube and cable core.
  • the two tabs are placed in face to face contact, trimmed and welded or soldered in order to provide a fluid-impervious envelope for the cable (see, e.g., US. Pat. No. 3,576,939).
  • a cable envelope is particularly impervious to water vapor and provides continuous electrical conductivity about the circumference of the cable, so that the cable conductors are adequately shielded.
  • Such tubes are very flexible and can readily be reeled on drums and unwound therefrom without kinking, rupture or the like. Moreover, such tubes are quite light.
  • the manufacture of tubing with thin walls is not always simple. This is particularly so if the metal strip consists of a light metal, such as aluminum.
  • Aluminum strip or tape which has thickness of not more than 0.3 millimeters is very difficult to work in a continuous process. For example, upon guiding thin strip at its edges, it was found that guide rolls may accidentally bend the edges or even bead them. Unfortunately, a tape which has been deformed in this manner, is no longer suitable for the contemplated tube and tab forming and welding process; undeformed stock is needed for obtaining a tube that is closed along its extension with certainty.
  • the continuously paid in tape or strip runs over a drum or the like for changing direction of travel just prior to folding the tape or strip into tubular form.
  • the tape or strip is slightly bent under tension so that the one side of the strip or tape, which will become the inner surface of the tube, is convexly' bent on an axis-which extends transversely to the axis of the tube to be made.
  • a cylindrical guide element in form of a wide roll or a drum shaped body made of plastic with a smooth surface, such as polyethylene and carrying rings which are preferably also made of polyethylene;
  • the rings should be adjustable in axial direction so as to limit severely the freedom of lateral displacement; thus, the rings should be only spaced apart for a distance about equal to the width of the tape.
  • This guide and deflection member is preferably also adjustable as to height in order to accommodate the apparatus to the particularly required tube diameter.
  • the tape or strip is usually advanced to the tube forming tool in horizontal direction, and a tube is usually formed by laterally bending and folding the tape or strip up and about a horizontal axis.
  • the tape or strip is first run over a roll for changing direction in ascending direction, and a second roll turns the tape or strip brackinto the horizontal thereby imparting temporarily convexity to the tape or strip as to the one surface that will become the inner surface of the tube shortly thereafter.
  • the two rolls are preferably mounted on a swivel. This way, the equipment can readily be matched to the requirements posed by making tubes of different diameters.
  • tape,.foil strip or the like Upon forming tape,.foil strip or the like into tubular form or a tubular profile, it is of advantage to support the thin stock during the entire forming process, from the outside and, if possible, also from the inside, so as to control each step of the forming process and to avoid undesired deformation.
  • a tape forming die element which acts on the tape from what will be the outside of the tube.
  • This tool is constructed to have an internal conical surface and is open at the top.
  • a convex/conical mandrel is received in the said conical die, serving therein as coacting die member around which the strip or tape is folded.
  • the mandrel has an upright, longitudinally extending fin. All parts of this tool, which come into sliding contact with the metal tape or strip, are
  • the ratio of the diameter of the tube to be made to the length of the conical contour of the tool and die elements is to be about 1:30. This way, it is possible to provide for the making of tubes of various diameters as well as tape (tube wall) thickness without kinking or the like.
  • the tube shaping mandrel and internal die member of the conical tool is preferably disposed therein for easy longitudinal displacement so that the tooling or parts thereof can readily be changed. Such change may be necessary, because there is, of course, some wear on several parts.
  • the mandrel may be constructed as a solid element particularly if the tube to be made is to be used as conduit for fluids.
  • the tube may have to be formed as an envelope about a cable core.
  • the mandrel is provided with an axial, concentric bore. The cable core runs through that bore, parallel to the paid-in strip or tape which is formed and folded as tubular envelope about the cable core.
  • the strip material may readily oxidize as far as any exposed surface is concerned. Therefore, it is necessary to prepare the edges to be welded so that there is no oxide present which can interfere with the welding process. It is, therefore, necessary or at least advisable, to run the tube with upstanding tabs through a roller cutter for trimming the tab edges.
  • the cutter is comprised of a pair horizontally rotating discshaped cutters cooperating with a guide disc situated immediately opposite one of the cutter as far as the cut- I ting plane is concerned; the guide disc is concentric to the other cutter and is eccentrically displaceable, so that the cutting tool can be adjusted to a variety of strip and tape thicknesses.
  • the cutting tool must be constructed so that the two mutually facing tabs are trimmed in a clean cut.
  • the cutter which is located opposite the guide disc, is particularly journalled for the same purpose; its bearings are also displaceably mounted so that the position for the cutter can also be adjusted in accordance with required tape or strip thickness.
  • a suitable liquid preferably a liquid on alcohol basis.
  • the wetting medium prevents cold welding of the cutter edges with the passing aluminum tape.
  • the cutter is preferably wetted in that felt pads slide across the rotating cutters, which felt pads may be drenched in alcohol, and suitable pipes feed wetting material to the felt pads to keep them moist, particularly in the respective areas of contact with the tabs to be cut.
  • the tube as it leaves the forming and shaping tool is provided with two tabs, which face each other, but are notyet joined. In order to avoid undue deformation, these two tab portions are to be maintained in position until the welding station has been reached. Therefore, it was found to be advisable to apply some pressure to the tabs, to be effective immediately behind the cutter. Pressure rolls fix, so to speak, the two tabs in mutual position.
  • a guide is provided which is open at the top and guiding the tube generally in the range and area of the cutting station. It is advisable to hold the tabs together right at and through the opening of the guide. This may be necessary in order to compensate for loss in material in the heating zone of the welding station.
  • the clamping and guiding arrangement should be provided with a cover to serve as a heat shield against the arc in the welding station.
  • FIG. I is a top view of a tube forming tool proper and of a tab trimmer including features in accordance with the preferred embodiment of the present invention
  • FIG. la illustrates a front view of the inner die member in the tube forming tool of FIG. 1;
  • FIG. lb illustrates a side elevation of the particular member shown in FIG. la;
  • FIG. 2 is a front view of a roll or drum element for convexly bending metal strip just before being folded for making a tube;
  • FIG. 3 is a side elevation of a tape or strip guiding device to be disposed immediately ahead of the tube forming tool and including the roll or drum of FIG. 2;
  • FIG. 4 is a section view through a cutter and tab trim mer to be placed immediately behind the tube forming tool but ahead of the welding station.
  • a first tube forming tool or die element 1 is provided with an internally conical contour; tool 1 is open at the top.
  • Mandrel 2 or the like is provided inside of tool I.
  • This internal die member 2 has also conical configuration and an upstanding fin 3 which tapers towards the narrow end of the tools conicity.
  • Die member 2 may be hollow so that a cable core may pass through for forming a tube about that core.
  • Aluminum tape 4 is paid into the tooland it runs into the space between the concavely conical die element l and the conical insert and die member 2, and a tube is formed through gradual folding of the tape in abutment with the internal taper of die 1.
  • the dimension and orientation of the tape is selected so that tape portions along theedges are bent up, at and along fin 3 to form two adjoining radial tabs. Due to the fact that the tool has conical configurations, the material, i.e. the tape, is drawnunder tension as it is being deformed.
  • the resulting tube with upstanding tabs runs into a tubular guide 5 made preferably from polyethylene and having a slot so that the tabs can pass through. That guide 5 defines the location for a cutting station 6 having two rotary cutters. Cutter 6 trims the tabs and thereby prepares the tabs for the welding step as de scribed, e.g., in US. Pat. No. 3,576,939; followed possibly by folding the tab down as is also described in that patent. Prior to welding the tabs may be squeezed together through rolls (not shown) which are laterally adjustable as well as adjusted for height to keep the two abutting tabs in-position until being welded.
  • Guide member 7 is constructed as a drum or rollerlike plastic body with flange rings 8 and 9. These rings 8 and g are displaceably mounted on drum or roll 7 for adjusting an axial space on the drum 7 inbetween.
  • the distance between the two flanges or rings 8- and 9 is adjusted to about the width of the tape or strip.
  • This drum 7 is disposed immediately in front of the tape shaping tool of H6. 1 and stabilizes the tape edges.
  • the tape or strip is only partially wrapped around drum 7, whereby the particular surface of the tape or strip which is in (concave) abutment with the convex drum; is that surface which will be in convex abutment with the concave conical contour of die l during the tube forming process.
  • the drum 7 has disposition so that its axis runs transversely to the axis of the tube to be made; this axis of the drum 7 is the axis of the resulting temporary convexity of that surface of the tape 4 which will face the interior of the tube when made.
  • This configuration of the guide for the tape tensions the tape against the tube forming process and prevents undue flanging, kinking or beading of the rather sensitive and delicate tape material along the edges.
  • FIG. 4 there is illustrated a pair of horizontally extending, rotary cutters l4 and 15, respectively mounted for rotation on vertically journalled shafts l6 and 17.
  • the bearings are not illustrated in detail and the drive for these rotary cutters has been omitted as it is a conventional one.
  • the cutter is mounted somewhat eccentrically as can be determined from an accurate inspection of the Figure. The eccentricity permits matching of the tooling to the various tapes thicknesses as they may arise.
  • Cutter 15 is mounted on a guide disc 18 for particularly guiding the tabs adjacent cutter l4.
  • the cutter M is also mounted for lateral (radial) displacement by means of an adjusting screw 19 so'that the position of cutter 14 relative to a guide disc 18 can be adjusted accordingly.
  • the outer edge of guide disc 18 is placed somewhat apart from the cutter 14 in order to make sure that the upright standing tab of the tube will not be bent at that point.
  • the rotating elements 18 and 14 are also disposed in particular spatial relation to a slotted guide element 20 for the tube with tabs just made, for running the tube with trimmed tabs exactly as desired to and into the welding station and in proper alignment thereto.
  • the waste as it is produced by the cutting and tab trimming process is actually a continuous thin strip and may be run out of the system through suitable pickup rolls.
  • the guide member 20 is preferably also made of a suitable plastic such as polyethylene, so that the tube can pass through in smooth gliding contact.
  • the improvement for stabilizing the running tape or strip comprising:
  • second means for slightly bending the tape or strip oppositely and under tension as running off straight from the first means, so that the one side of the tape or strip has temporarily convex configuration with respect to a second axis oriented parallel to the first axis and transversely to the axis of folding, the second means being disposed to be effective immediately ahead of the folding of the tape or strip into a tube.
  • the second means for bending is a cylindrical element over which the tape or strip is partially wrapped for a change in direction of travel.
  • cylindrical element being disposed for adjustment in direction transversely to the direction of travel of the tape or strip as it runs off the element.
  • the die member being axiallydisplaceable in the die element.
  • the rotating cutter including a pair of cuttingly coacting cutter discs, wherein one cutting disc is on a guide disc, and being radially juxtaposed and facing the other cutting disc of the pair.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00280483A 1971-08-16 1972-08-14 Method and apparatus for making tubing from metal tape Expired - Lifetime US3813910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2140945A DE2140945A1 (de) 1971-08-16 1971-08-16 Verfahren zum formen eines laengseinlaufenden metallbandes duenner wandstaerke zum rohr

Publications (1)

Publication Number Publication Date
US3813910A true US3813910A (en) 1974-06-04

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ID=5816846

Family Applications (1)

Application Number Title Priority Date Filing Date
US00280483A Expired - Lifetime US3813910A (en) 1971-08-16 1972-08-14 Method and apparatus for making tubing from metal tape

Country Status (17)

Country Link
US (1) US3813910A (ja)
JP (1) JPS4848357A (ja)
AT (1) AT320778B (ja)
AU (1) AU461919B2 (ja)
BE (1) BE780248A (ja)
BR (1) BR7202633D0 (ja)
CA (1) CA971042A (ja)
CH (1) CH538313A (ja)
DD (1) DD96161A5 (ja)
DE (1) DE2140945A1 (ja)
FR (1) FR2149335B1 (ja)
GB (2) GB1397592A (ja)
IT (1) IT948701B (ja)
NL (1) NL7205192A (ja)
SE (1) SE397640B (ja)
SU (1) SU506335A3 (ja)
ZA (1) ZA721425B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476282C1 (ru) * 2011-09-22 2013-02-27 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Формовочная клеть
CN113410009A (zh) * 2021-06-24 2021-09-17 通鼎互联信息股份有限公司 一种电缆焊接屏蔽工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463675A2 (fr) * 1978-08-25 1981-02-27 Ollivier Jean Tube composite metal-matiere plastique et procede pour le fabriquer
DE2928612C2 (de) * 1979-07-14 1986-01-30 AEG KABEL AG, 4050 Mönchengladbach Vorrichtung zur Herstellung eines Kabels
WO2024042973A1 (ja) * 2022-08-22 2024-02-29 三菱電機株式会社 成形装置、溶接管の製造装置、管の成形方法および溶接管の製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469663A (en) * 1892-02-23 Edwin t
US2574509A (en) * 1946-07-31 1951-11-13 Elizabeth R B Stuart Vertical axis beading
US2821348A (en) * 1952-07-31 1958-01-28 Loewy Eng Co Ltd Coiling apparatus for metal strip
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS526287B2 (ja) * 1971-09-17 1977-02-21

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469663A (en) * 1892-02-23 Edwin t
US2574509A (en) * 1946-07-31 1951-11-13 Elizabeth R B Stuart Vertical axis beading
US2821348A (en) * 1952-07-31 1958-01-28 Loewy Eng Co Ltd Coiling apparatus for metal strip
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476282C1 (ru) * 2011-09-22 2013-02-27 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Формовочная клеть
CN113410009A (zh) * 2021-06-24 2021-09-17 通鼎互联信息股份有限公司 一种电缆焊接屏蔽工艺
CN113410009B (zh) * 2021-06-24 2023-02-14 通鼎互联信息股份有限公司 一种电缆焊接屏蔽工艺

Also Published As

Publication number Publication date
DD96161A5 (ja) 1973-03-12
ZA721425B (en) 1972-11-29
ATA430775A (de) 1978-11-15
AT320778B (de) 1975-02-25
AU461919B2 (en) 1975-06-12
NL7205192A (ja) 1973-02-20
CH538313A (de) 1973-06-30
CA971042A (en) 1975-07-15
GB1397592A (en) 1975-06-11
IT948701B (it) 1973-06-11
BE780248A (fr) 1972-07-03
GB1397593A (en) 1975-06-11
AU4256072A (en) 1973-11-29
SE397640B (sv) 1977-11-14
DE2140945A1 (de) 1973-03-01
FR2149335A1 (ja) 1973-03-30
FR2149335B1 (ja) 1974-12-13
BR7202633D0 (pt) 1973-06-28
JPS4848357A (ja) 1973-07-09
SU506335A3 (ru) 1976-03-05

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Owner name: KABELMETAL ELECTRO GMBH, KABELKAMP 20, 3000 HANNOV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KABEL- UND METALLWERKE GUTEHOFFNUNGSHUTTE AG;REEL/FRAME:004284/0182