CA2128166A1 - Process for producing corrugated tube and product produced thereby - Google Patents
Process for producing corrugated tube and product produced therebyInfo
- Publication number
- CA2128166A1 CA2128166A1 CA002128166A CA2128166A CA2128166A1 CA 2128166 A1 CA2128166 A1 CA 2128166A1 CA 002128166 A CA002128166 A CA 002128166A CA 2128166 A CA2128166 A CA 2128166A CA 2128166 A1 CA2128166 A1 CA 2128166A1
- Authority
- CA
- Canada
- Prior art keywords
- tube
- corrugation
- corrugated metal
- producing
- accordance
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- NYQDCVLCJXRDSK-UHFFFAOYSA-N Bromofos Chemical compound COP(=S)(OC)OC1=CC(Cl)=C(Br)C=C1Cl NYQDCVLCJXRDSK-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- ACXGJHCPFCFILV-UHFFFAOYSA-M sodium;2-(4-chloro-2-methylphenoxy)acetate;3,6-dichloro-2-methoxybenzoic acid Chemical compound [Na+].COC1=C(Cl)C=CC(Cl)=C1C(O)=O.CC1=CC(Cl)=CC=C1OCC([O-])=O ACXGJHCPFCFILV-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- H01B13/2633—Bending and welding of a metallic screen
-
- 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
-
- 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
-
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
- B21C37/205—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with annular guides
-
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
- B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0838—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt
- B23K26/0846—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt for moving elongated workpieces longitudinally, e.g. wire or strip material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/032—Seam welding; Backing means; Inserts for three-dimensional seams
- B23K9/0325—Seam welding; Backing means; Inserts for three-dimensional seams helicoidal seams
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Arc Welding In General (AREA)
- Metal Extraction Processes (AREA)
- Laser Beam Processing (AREA)
- Manufacturing Of Electric Cables (AREA)
- Details Of Indoor Wiring (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a process for producing a helically or annularly corrugated metal tube and the product produced thereby, a metal band is drawn from a storage spool and formed into a longitudinal slit tube, the slit tube is welded longitudinally as by laser or TIG pulse welding and formed with a helical or annular corrugation by an annular corrugation tool operating eccentrically around the tube axis. The product is produced with a ratio of over of outside diameter D to wall thickness s and the corrugation has a ratio of less than
In a process for producing a helically or annularly corrugated metal tube and the product produced thereby, a metal band is drawn from a storage spool and formed into a longitudinal slit tube, the slit tube is welded longitudinally as by laser or TIG pulse welding and formed with a helical or annular corrugation by an annular corrugation tool operating eccentrically around the tube axis. The product is produced with a ratio of over of outside diameter D to wall thickness s and the corrugation has a ratio of less than
Description
PROC~B FOR 2ROD~CI~ ~ORR~ATED T~BB
A~D PRO WCT PROD~C~D ~R~BY
BACKGROUND OF THE INVENTION
l. Fiela of I~ve~tio~
This invention relates to a process for producing a helically or annularly corrugated ~ube and product produced thereby.
A~D PRO WCT PROD~C~D ~R~BY
BACKGROUND OF THE INVENTION
l. Fiela of I~ve~tio~
This invention relates to a process for producing a helically or annularly corrugated ~ube and product produced thereby.
2. De~criptio~ o~ the Prior Art The cable industry uses csrrugated mekal tubes as protective sheaths for cables and as the inner and/or outar conductors of coaxial high or radio frequency cables, which generally have a ratio of 3l0 to l of outside diameter D
of the corrugated metal tube to the wall thickness s of the corrugated metal tube. The ratio of the pitch T or Tp of the corrugations to the depth t of the corrugations is at least 3 l5. The use of a corrugated metal tube as a conductor of fluids is also known.
.i The above named values were proven in practice for the corrugated tube, because a corrugated tube must be flexible, dimensionally stable, i.e. rigid crosswise and resistant to dents.
The corrugated metal tube represents a considerable cost and weight factor of the respective cable structure.
The wall thickness and the outside diameter of the corrugated tube, as well as the material, are significant for its weight. Since, as a rule, the outside diameter and :;
' ., - : ~ :
. . .
: - , :'~
~'. . .
th~ material are ~peclfle~ or optimized, t~e w~ight can only be reduc~d ~y r~duclng th~ w~ll thlckn~s~.
In the known corrug~t~d tube, r~duclng o~ the wal}
thlcXn~s~ with the ~am~ outsid~ di~oto~ lead~ to an un~table corrugated tube., l.e. ln th~ ca~e of a protectlve ~heatb ror elcctrl~al cablo~, thQ w~ved crR~t~ o~ th~
protecti~e she~th are d~formed when th~y are r~led on ~
c~ble dru~. In additlon, th~ corrugated tube i~ de~ormed ~nto an oval cross ~sctlon, whlch un~avorably ~ CtB thQ
transml~ion charaa~erlstic~ of a coaxlal radlo frequ~ncy ca~
Corrugat~d ~netal ~ubes th~lt can be usod a~ sheath~ ror electr~cal caklea ar~ known ~rom CA-PS 603 521. Th~ ~,ube~
con~i~t of A hard alu~lnunl ~lloy or a so~t ~t~el, i ~ e . o~ a 15 materlal with a tenslle ~trength of ~G - 35 kp/mm2 ~7 - 25 tons per squ~re lnch). T~ r~dua~ the wAll thlckne~s ln such : tubes with the s~ quali~y, it i~ proposed ln CA-PS fio3 527 : t~k the lnsido diamoter is betw~en 75~ and 85~ of the ou~id* diameter of tho corrugated tub~, thAt th~ piteh o~
20 the corrugation6 is between 15 a~d 25~ o~ the outalde diameter, and that the wall thlckne~s o~ tha tube i~ b~tween -0.5 and 2~ o~ the ou~side di~m~ter of th- corrugat~ tube.
An absolute ~illue oX 0.06 m~ is ~dd~d to the w~ll thickne~s, mea~ured ln m~.
; 25 ~ccor~lng to th- 3p~cifi~d conditions ~n CA~PS ~03 527, fo~ a tubo ~it~ an out~ide diamet~r o~ 40 mm, a ratio of out~i~e dla~eter to wall thlckne~ of 461 5 to 192 and ~ ratio of corrug~tion pitch to corrugation dQpth of 1-125 to 4 167 can ~e calculated, wher~ th~ wall thicknes6 i~s ut~ide - a_lnsidQ~ ~ wall t~ickneos.
~0~ 913 ~V13 ~30S~3~ 3~VM gl9519Z~OZ sz:a~ LO-b6~1 ,- ~ , .,-, . ` - . :
. , : , : ' : "', ,' , ` '-, .
:: , ' , ~ . .
~ J~
Investigations in the assignee's facility have shown that tubes with a D/s ratio of more than 100 , and/or a corrugation pitch to corrugation depth ratio of less than 3 15, cannot be produced with the known corrugation process, in which a rotating corrugation roller locat~d in a corrugation head rolls over the surface of the welded tube and presses on the tube wall, producing the corrugation.
SUM~L~Y OF THE INVENTION
In a process for producing as its products a helically or annularly corrugated metal tube, a metal band is drawn from a storage spool and shaped into a slotted tube, the slotted tube is welded with a longitudinal seam, and a helical or annular corrugation i5 formed in the welded tube by means of an annular corrugating tool operating eccentrically around the tube axis. This produces a slotted tube with a ratio o~ more than 11 of outside diameter D to wall thickness s, the slotted tube is welded by a laser or by TIG-pulse welding, and the corrugation has a ratio of less than 3 15 of its pitch T or Tp, with respect to its depth t.
The invention has the task of improving the known corrugation process to the extent that stable, crosswise ~ rigid but still flexible corrugated tubes can be producsd, particularly for electrical cable sheaths, with less wall thickness than the known corrugated tubes.
The invention increases the stability and the resistance to denting with a lower corrugation depth and : smaller corrugation pitch. The new corrugation form maintains the stability and resistance to denting, even under the most extreme conditions, since the forces acting on each corrugation crest of the known corrugated tube are .
'. . ~ .:
.. . . ..
.
: . :
, 5 ~
divided into many individual forces, which in ad~ition act on a stable corrugation cr~st ~f smaller size, and therefore of increased stability.
Another advantage of the invention can be found in that the selection of the welding process minimizes the heat affected zone.
BRIEF DESCRIPTION OF THE DRA~IN~S
Other objects and features of the invention will be apparent to those skilled in the art from the following specification and drawings, all of which disclose a non-limiting embodiment of the invention. In the drawings:
FIG. 1 is a simplified side view of a process line embodying the invention;
FIG. 2 is a greatly enlarged fragmenting longitudinal sectional view of a product of the process showing the core in profile;
FIG. 3 is a fragmentary center-line section of a helical corrugated tube; and FIG. 4 is a fragmentary center line section of an annular corrugated tube.
DETAILED DESCRIPTION OF THE INVENTION
A metal band 2 is drawn from a storage spool 1 and is first cleaned in an installation 3, and its edges are trimmed. The band 2 prepared in this way advances to a forming installation 4, in which the band 2 is gradually shaped into a tube having a longitudinal slit where the :`
- - -. . . .
: ' ~, ' :
: . , , . -- . - -, ~
- ~ 5 ~
edges of the band meet. Along the slit, the tube is welded into a cl~sed tube with a longitudinal seam in a welding installation 5.
The welding installation i5 either a laser welding S installation, in which case the cleaning installation 3 can be omitted, or an argon-arc-pulse welding installation (TIG-pulse welding installation). Both welding processes have in common that a small welding seam can be achieved, i.e. the heat-affected zone, which softens ~he metal band, is thus narrowly limited. The weld can also be cold formed.
The conveying device 6, which conveys the welded tube, is a grip-jaw conveyor, on which several pairs of grip~jaws 8 traveling on an endless chain 7 in the direction indicated by the arrows, grip the tube.
The tube next is engaged by a corrugation device, which operates according to the rolling corrugation principle, such as known from DE-AS 1 086 314 or D~-OS 1 916 357. Finally, the corrugated metal tube 10 is guided to a ; drum 12 by a tension-controlling roller 11.
If electrical cables with a corrugated metal sheath are produced by the described installation, the cable core is guided into the still-open tube in the area of the forming installation 4.
If corrugated metal tubes are produced, it can be an advantage if the weld seam is solidified by cold-forming before the corrugation.
.
~J~ J
Example In FIGS. 2 and 3, the electrical cable 20 comprises a cable core 21 and a cable sheath 22. A not illustrated plastic jacket can be installed over the cable sheath 22.
The cable sheath 22 is a corrugated metal tube :
produced in accordance with the principle of the invention, which has the following dimensions:
Outside diameter D = 41 mm Inside diameter d = 36.4 mm 10 (~ cable core diameter) Wall thickness s = O.4 mm Corrugation depth t = 1.9 mm Corrugation pitch T = 5.4 mm (~ distance between two corrugation crests) A ratio of ~/s = 41/0.4 = 102.5 and a ratio of T/t =
5.4/1.9 = 2.8~ are the result of such a corrugated tube.
Until now, a corrugated tube with the above cited : dimensions could not be produced with the processes known from DE-AS 10 86 314 or DE-OS l 916 357.
, ,;~
.; .
-:
-,
of the corrugated metal tube to the wall thickness s of the corrugated metal tube. The ratio of the pitch T or Tp of the corrugations to the depth t of the corrugations is at least 3 l5. The use of a corrugated metal tube as a conductor of fluids is also known.
.i The above named values were proven in practice for the corrugated tube, because a corrugated tube must be flexible, dimensionally stable, i.e. rigid crosswise and resistant to dents.
The corrugated metal tube represents a considerable cost and weight factor of the respective cable structure.
The wall thickness and the outside diameter of the corrugated tube, as well as the material, are significant for its weight. Since, as a rule, the outside diameter and :;
' ., - : ~ :
. . .
: - , :'~
~'. . .
th~ material are ~peclfle~ or optimized, t~e w~ight can only be reduc~d ~y r~duclng th~ w~ll thlckn~s~.
In the known corrug~t~d tube, r~duclng o~ the wal}
thlcXn~s~ with the ~am~ outsid~ di~oto~ lead~ to an un~table corrugated tube., l.e. ln th~ ca~e of a protectlve ~heatb ror elcctrl~al cablo~, thQ w~ved crR~t~ o~ th~
protecti~e she~th are d~formed when th~y are r~led on ~
c~ble dru~. In additlon, th~ corrugated tube i~ de~ormed ~nto an oval cross ~sctlon, whlch un~avorably ~ CtB thQ
transml~ion charaa~erlstic~ of a coaxlal radlo frequ~ncy ca~
Corrugat~d ~netal ~ubes th~lt can be usod a~ sheath~ ror electr~cal caklea ar~ known ~rom CA-PS 603 521. Th~ ~,ube~
con~i~t of A hard alu~lnunl ~lloy or a so~t ~t~el, i ~ e . o~ a 15 materlal with a tenslle ~trength of ~G - 35 kp/mm2 ~7 - 25 tons per squ~re lnch). T~ r~dua~ the wAll thlckne~s ln such : tubes with the s~ quali~y, it i~ proposed ln CA-PS fio3 527 : t~k the lnsido diamoter is betw~en 75~ and 85~ of the ou~id* diameter of tho corrugated tub~, thAt th~ piteh o~
20 the corrugation6 is between 15 a~d 25~ o~ the outalde diameter, and that the wall thlckne~s o~ tha tube i~ b~tween -0.5 and 2~ o~ the ou~side di~m~ter of th- corrugat~ tube.
An absolute ~illue oX 0.06 m~ is ~dd~d to the w~ll thickne~s, mea~ured ln m~.
; 25 ~ccor~lng to th- 3p~cifi~d conditions ~n CA~PS ~03 527, fo~ a tubo ~it~ an out~ide diamet~r o~ 40 mm, a ratio of out~i~e dla~eter to wall thlckne~ of 461 5 to 192 and ~ ratio of corrug~tion pitch to corrugation dQpth of 1-125 to 4 167 can ~e calculated, wher~ th~ wall thicknes6 i~s ut~ide - a_lnsidQ~ ~ wall t~ickneos.
~0~ 913 ~V13 ~30S~3~ 3~VM gl9519Z~OZ sz:a~ LO-b6~1 ,- ~ , .,-, . ` - . :
. , : , : ' : "', ,' , ` '-, .
:: , ' , ~ . .
~ J~
Investigations in the assignee's facility have shown that tubes with a D/s ratio of more than 100 , and/or a corrugation pitch to corrugation depth ratio of less than 3 15, cannot be produced with the known corrugation process, in which a rotating corrugation roller locat~d in a corrugation head rolls over the surface of the welded tube and presses on the tube wall, producing the corrugation.
SUM~L~Y OF THE INVENTION
In a process for producing as its products a helically or annularly corrugated metal tube, a metal band is drawn from a storage spool and shaped into a slotted tube, the slotted tube is welded with a longitudinal seam, and a helical or annular corrugation i5 formed in the welded tube by means of an annular corrugating tool operating eccentrically around the tube axis. This produces a slotted tube with a ratio o~ more than 11 of outside diameter D to wall thickness s, the slotted tube is welded by a laser or by TIG-pulse welding, and the corrugation has a ratio of less than 3 15 of its pitch T or Tp, with respect to its depth t.
The invention has the task of improving the known corrugation process to the extent that stable, crosswise ~ rigid but still flexible corrugated tubes can be producsd, particularly for electrical cable sheaths, with less wall thickness than the known corrugated tubes.
The invention increases the stability and the resistance to denting with a lower corrugation depth and : smaller corrugation pitch. The new corrugation form maintains the stability and resistance to denting, even under the most extreme conditions, since the forces acting on each corrugation crest of the known corrugated tube are .
'. . ~ .:
.. . . ..
.
: . :
, 5 ~
divided into many individual forces, which in ad~ition act on a stable corrugation cr~st ~f smaller size, and therefore of increased stability.
Another advantage of the invention can be found in that the selection of the welding process minimizes the heat affected zone.
BRIEF DESCRIPTION OF THE DRA~IN~S
Other objects and features of the invention will be apparent to those skilled in the art from the following specification and drawings, all of which disclose a non-limiting embodiment of the invention. In the drawings:
FIG. 1 is a simplified side view of a process line embodying the invention;
FIG. 2 is a greatly enlarged fragmenting longitudinal sectional view of a product of the process showing the core in profile;
FIG. 3 is a fragmentary center-line section of a helical corrugated tube; and FIG. 4 is a fragmentary center line section of an annular corrugated tube.
DETAILED DESCRIPTION OF THE INVENTION
A metal band 2 is drawn from a storage spool 1 and is first cleaned in an installation 3, and its edges are trimmed. The band 2 prepared in this way advances to a forming installation 4, in which the band 2 is gradually shaped into a tube having a longitudinal slit where the :`
- - -. . . .
: ' ~, ' :
: . , , . -- . - -, ~
- ~ 5 ~
edges of the band meet. Along the slit, the tube is welded into a cl~sed tube with a longitudinal seam in a welding installation 5.
The welding installation i5 either a laser welding S installation, in which case the cleaning installation 3 can be omitted, or an argon-arc-pulse welding installation (TIG-pulse welding installation). Both welding processes have in common that a small welding seam can be achieved, i.e. the heat-affected zone, which softens ~he metal band, is thus narrowly limited. The weld can also be cold formed.
The conveying device 6, which conveys the welded tube, is a grip-jaw conveyor, on which several pairs of grip~jaws 8 traveling on an endless chain 7 in the direction indicated by the arrows, grip the tube.
The tube next is engaged by a corrugation device, which operates according to the rolling corrugation principle, such as known from DE-AS 1 086 314 or D~-OS 1 916 357. Finally, the corrugated metal tube 10 is guided to a ; drum 12 by a tension-controlling roller 11.
If electrical cables with a corrugated metal sheath are produced by the described installation, the cable core is guided into the still-open tube in the area of the forming installation 4.
If corrugated metal tubes are produced, it can be an advantage if the weld seam is solidified by cold-forming before the corrugation.
.
~J~ J
Example In FIGS. 2 and 3, the electrical cable 20 comprises a cable core 21 and a cable sheath 22. A not illustrated plastic jacket can be installed over the cable sheath 22.
The cable sheath 22 is a corrugated metal tube :
produced in accordance with the principle of the invention, which has the following dimensions:
Outside diameter D = 41 mm Inside diameter d = 36.4 mm 10 (~ cable core diameter) Wall thickness s = O.4 mm Corrugation depth t = 1.9 mm Corrugation pitch T = 5.4 mm (~ distance between two corrugation crests) A ratio of ~/s = 41/0.4 = 102.5 and a ratio of T/t =
5.4/1.9 = 2.8~ are the result of such a corrugated tube.
Until now, a corrugated tube with the above cited : dimensions could not be produced with the processes known from DE-AS 10 86 314 or DE-OS l 916 357.
, ,;~
.; .
-:
-,
Claims (12)
1. A process for producing a corrugated metal tube comprising the steps of:
(a) forming a metal strip into a longitudinally slit tube;
(b) welding the longitudinally slit tube to provide a welded tube with a longitudinal seam; and (c) corrugating the welded tube by means of an annular corrugating tool operating eccentrically around an axis of the welded tube to form a corrugated tube having corrugations having a shape chosen from a group consisting of helical and annular, the corrugated tube being defined by a ratio of more than of outside diameter to wall thickness and the corrugations are produced with a ratio of less than of corrugation pitch to corrugation depth.
(a) forming a metal strip into a longitudinally slit tube;
(b) welding the longitudinally slit tube to provide a welded tube with a longitudinal seam; and (c) corrugating the welded tube by means of an annular corrugating tool operating eccentrically around an axis of the welded tube to form a corrugated tube having corrugations having a shape chosen from a group consisting of helical and annular, the corrugated tube being defined by a ratio of more than of outside diameter to wall thickness and the corrugations are produced with a ratio of less than of corrugation pitch to corrugation depth.
2. A process for producing a corrugated metal tube in accordance with claim 1, wherein the welding is accomplished by a laser.
3. A process for producing a corrugated metal tube in accordance with claim 2, wherein the welded tube is subjected to longitudinal drawing prior to corrugation to reduce the diameter.
4. A process for producing a corrugated metal tube in accordance with claim 1, wherein the welding step is accomplished by an argon-arc-pulse apparatus.
5. A process for producing a corrugated metal tube in accordance with claim 4, wherein the welded tube is subjected to longitudinal drawing prior to corrugation to reduce the diameter.
6. A process for producing a corrugated metal tube in accordance with claim 1, wherein after the welding step, the longitudinal seam is cold formed.
7. A process for producing a corrugated metal tube in accordance with claim 6, wherein the welded tube is subjected to longitudinal drawing prior to corrugation to reduce the diameter.
8. A process for producing a corrugated metal tube in accordance with claim 1, wherein the welded tube is subjected to longitudinal drawing prior to corrugation to reduce the diameter.
9. A product produced by the process of claim 1.
10. A corrugated metal tube having a ratio of more than of outside diameter to wall thickness and a ratio of less than of corrugation pitch to corrugation depth.
11. A corrugated metal tube in accordance with claim 10 having helical corrugations.
12. A corrugated metal tube in accordance with claim 10 having annular corrugations.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4323649.9 | 1993-07-15 | ||
| DE4323649A DE4323649A1 (en) | 1993-07-15 | 1993-07-15 | Process for producing a helically or annularly corrugated metal tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2128166A1 true CA2128166A1 (en) | 1995-01-16 |
Family
ID=6492834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002128166A Abandoned CA2128166A1 (en) | 1993-07-15 | 1994-07-15 | Process for producing corrugated tube and product produced thereby |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0636432A1 (en) |
| JP (1) | JPH07144219A (en) |
| CA (1) | CA2128166A1 (en) |
| DE (1) | DE4323649A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205830A (en) * | 2016-08-26 | 2016-12-07 | 深圳市金环宇电线电缆有限公司 | A kind of helical form armored cable and production method thereof |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053128C (en) * | 1995-06-22 | 2000-06-07 | 冶金工业部钢铁研究总院 | Process of two layer lead soldered tube |
| DE19701970A1 (en) * | 1997-01-22 | 1998-07-23 | Ralph Peter Dr Ing Hegler | Method and device for producing an enveloping corrugated tube with a line located therein |
| CN103978374B (en) * | 2014-05-22 | 2016-06-01 | 浙江久立特材科技股份有限公司 | Umbilical cables steel pipe coil production line |
| CN107855372A (en) * | 2017-09-13 | 2018-03-30 | 花园金波科技股份有限公司 | A kind of compound stretch forming method of bellows pipe |
| CN107639124A (en) * | 2017-09-13 | 2018-01-30 | 花园金波科技股份有限公司 | A kind of revolving compound Automatic-drawing device |
| CN107755547A (en) * | 2017-09-13 | 2018-03-06 | 花园金波科技股份有限公司 | A kind of lower die structure of rotary compound Automatic-drawing device |
| EP3797891B1 (en) * | 2019-09-30 | 2023-08-02 | Nexans | Method for the continuous production of thin-walled hollow profiles with small diameters, corrugated in sections and made from non-ferrous metals |
| CN112355108B (en) * | 2020-10-23 | 2022-06-17 | 南京德邦金属装备工程股份有限公司 | Forming method of large-caliber corrugated pipe expansion joint |
| CN113319149B (en) * | 2021-08-03 | 2021-11-02 | 天津市大千管业有限公司 | Integrated forming equipment and method for producing annular metal corrugated pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA603527A (en) * | 1960-08-16 | R. Penrose James | Metal tubes or metal sheaths of electric cables | |
| US4083484A (en) * | 1974-11-19 | 1978-04-11 | Kabel-Und Metallwerke Gutehoffnungshutte Ag | Process and apparatus for manufacturing flexible shielded coaxial cable |
| DE2837184A1 (en) * | 1978-08-25 | 1980-03-06 | Kabel Metallwerke Ghh | METHOD AND DEVICE FOR PRODUCING TUBES FOR HEAT EXCHANGERS |
| DE2911403A1 (en) * | 1979-03-23 | 1980-09-25 | Kabel Metallwerke Ghh | METHOD AND DEVICE FOR PRODUCING LENGTH SEWED TUBES FROM METALS |
| JP2778287B2 (en) * | 1991-06-03 | 1998-07-23 | 住友金属工業株式会社 | Laser pipe welding method |
-
1993
- 1993-07-15 DE DE4323649A patent/DE4323649A1/en not_active Withdrawn
-
1994
- 1994-07-05 EP EP94110452A patent/EP0636432A1/en not_active Withdrawn
- 1994-07-14 JP JP6162443A patent/JPH07144219A/en not_active Withdrawn
- 1994-07-15 CA CA002128166A patent/CA2128166A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205830A (en) * | 2016-08-26 | 2016-12-07 | 深圳市金环宇电线电缆有限公司 | A kind of helical form armored cable and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0636432A1 (en) | 1995-02-01 |
| DE4323649A1 (en) | 1995-01-19 |
| JPH07144219A (en) | 1995-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |