Note: Descriptions are shown in the official language in which they were submitted.
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-200
1
PROCESS FOR PRODUCING COPPER-BRAZED DOUBLE WALL ST EL TUBES BY
MEANS OF LONG COOLING LINE ANNEALING METH Q
TECHNICAL FIELD
The invention relates to the production method for metal tube having t least
two watis
brought together by means of copper-brazing method.
The production process developed according to the present invention c rises
the process
steps of air-cooling the tube by means of the annealing line integri-ted ith
the elongation
line, covering Iha tunnel forming the annealing line with serpentine auch at
said anneaiing
line wiii not be too Ionp, end in the tube shaping group, Increasing th
diameters of the
spools and the bearing that enable to shape the tubes so that the oacillatio
of the band layer
is reduced during when the pipe is taking a shape and smoother sect nal
surfaces are
obtained.
PRIOR ART
The stainiess ateet matertai used in today's industry are preferred to a very
wide extent,
because of their high corrosion and oxidation resistance, high mecha ical and
physicai
properties, hot and cold workabiiity and weldability. In order to avoid c
rrosion, the steel
sheeta are used after increasing the corrosion resistance of their surface The
steel sheets
made of steel material are generally used in the production of steel tubes.
Steel sheet tubes
have a very wide field of use, especiaiiy as the brake and fuel tube in the
utomotive sector
and also as the condenser tube in the refriBerator,.washing machine and
ishwasher, hence
the resistance to corrosion must be provided for the surfaces thereof In ntact
with water
and moisture.
The chemical decomposition an eiectrolyte undergoes under the effect of n
electric current
is cilled electrolysis. Eiectrolysis develope along with the conduction of aid
current within
the electrolyte. Electrolyte is frequently in dissolved form or In the fo of
an aqueous
solution of a sait. Both surfaces of said steel sheet Is coated with co er to
be used in
brazing process, by means of electrolysis method_ The copper-coated st el
sheet is cut in
the form of bands having the widths theoretically caiculat d beforehand to the
production of
the tube with desired diameter, and the bands are wound in the form of olis.
The copper-
CoBted sheet bands cut and wound into the bands with appropriate width e
passed through
shaping spoois placed one after the other and are allowed to take the t be
shape in cold
process by means of the mandrel.
AMENDED SHEET
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-200~
2
The produced copper-coated double wait tubes are corlductivety hosted u to a
temperature
(-1150 C) above the melting temperature of copper, end brazed to ach other
under
protective gas (hydrogen) at a certain advancing speed in the h ating u it. In
the heating
unit, the copper, La, the brazing materlai, is prevented from cooling do , as
well as from
being oxidized under the gas atmosphere. One of the brazing procee takes place
via
movable contact units, while the other takes place with stationary eontQct u
its.
According to the atate of the art, onoe the brazing has taken place, the per-
coated steel
sheet In the form of a tub anters the annealing unit and the pipe is watere
at the end of the
line to provide cooling. The hot copper-coated steel tube enters a fast egime
of cooling
under the influence of water, at the end of the annealing unit.
According to the' state of the art, the costs Increase and the quality re uess
due to the
reosong mentioned above.
Today, the practic~s related to brazing the steel sheets are known to ist. One
of such
practices disdosed in the document no. JP7266886 relates to eiectro-p
vanization of the
steel layer by means of point weidabiiity. This document relates to st pi s et
with Increased
weidability able to be uaed in the industry with high efFlci ncy.
Another practice in the document no. TR 2006 02246U relates to the nits
wherein the
brazing provided according to automation by converting the steel sheet ra
material from the
band form into the cylindrical form, According to this practice, the inven on
relates to the
units wherein the brazing Is carried out according to automation by conv ing
the stainkss
steel sheet raw material from band form into cylindrical tubes. The model d
signed as Unit 1,
Unit 2 and Unit 3 comprises band raw material iniet (1), castemide ru er (2),
rope (3),
castamido (4), welding torch (5), diamond tip (6) and pipe outtet (1). he
units may be
adjusted rightwards, ieftwards, upwards and downward and their dep e may also
be
adjusted. Castamide (4) is used in Unit 1, Unit 2 and Unit 3. The rope (3
providing form to
the materiai used enables the smooth flow of material. In Unft 3, the rounded
metallic
diamond tip (6) is used made of castamide having a corrosion time of 6 m ths.
The support
is provided by means of this diamond tip (6) to enable the fom,ed m teri 1 to
flow towards
the weld In a continuous and uniform manner.
The patent publication no. US2p03012909 relates to the double wall I es
comprising a
polyamide-based layer at the inside thereof and an outer iayer formed of
materiai selected
from potyether eater, polyester ether and fluorinated polymer.
AMENDED SHEET
CA 02699249 2010-03-10
-=-----__ _....._~.._.
PCT/TR 2008/000 103 - 10-07-200
3
The patent publication no. US200304 1912 relates to the tubes used In veying
the fluids
comprising an inner layer made of steel, an outer layer made of steel surr
unding said Inner
layer and an end connecting piece made of weldable steel.
However, said double wall tubes are not able to provide the desired st ngth.
In addition,
extra labor and time losses occur during the production steps of said tu s,
costs increase
and water consumption becomes very high.
As a result, the presence of the need for the high atrength double wall tub ,
which eliminate
the disadvantages existing in the state, of the art, and the inadequacy of t
existing solutions
have made It necessary to provide an improvement In the related art.
OBJECT OF THE INVENTION
The present invention relates to the method for producing the metal tube with
at least two
walls, which satisfies the aforesaid requirements, eiiminates all the d
dvantages and
provides some additional advantages.
The object of the invention is to carry out a metal tube production method at
enebbs more
controlled and slower cooiin9, by cooling at least two wailed tube by mea of
air within the
line where it passes through, instead of contacting with water the copper.
ated and at least
two,welied tube coming out of brazing process, owing to the elongation of e
line.
The object of the invention is both to prevent the increase in the hardness
alues of the metal
tubes owing to cooling by air and to avoid the possible corrosive effects of
he water, which Is
used for cooling purposes and contacted with said tube, on the surface of t e
materiai.
In order for the cooling In the winding machines at the end of the ine to
reach the
temperature that Is possible to reach by the cooling process with wat r, it is
needed to
extend the cooling line, In order to avoid an excessive length in the cool g
line, the tunnel
forming the annealing unit is wrapped by serpentine sheets and in this wa ,
the surface area
in contact with the air Is increased.
Another object of the invention is to decrease the osciliation of the band
uring the time the
tube is taking shape and thus to make it possible to obtain smoother secti al
surfaces.
Another object of the Invention is to incroase the quality of production and
he oroduct.
AMENDED SHEET
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-200'
Another object of the Invention is to reduce the costs.
Another object of the invention is to carry out the production of the tu with
wider outer
diametRr. In this way, the product diversity is increacod.
In order to achieve all the afor said advantages that will understood drn the
following
detailed description, the present invention enables the tube to be cool by
provldng its
contact with the 0ir by meane of the snnealing line lntegrated wRh t
elongation lino,
wherein the tunnel forming the annealing line is covered by serpmntina s aets
ao that said
annealing line wlii not be excessivety long, thus the heat transfer nate may
Increased. Also
in the tube shaping yroup, the diameters, of the spools and the bearings th
allow the tube to
take shape are enlarged such that the oscillation of the band layer Is red ced
during when
the pipe Is taking its shape and smoother sectional surfaces are obtained.
The structurai and characteristic features and all the advantages of the inv
ntion will be more
clearly understood from the appended drawings and the detailed des ion written
with
referenee to said figures and therefore, the evaluation must be iiiede taking
into
consideration these figures and the det lled descrrption.
BRIEF DESCRIPTION OF THE FIOURLS
In order to best understand the embodiment of the present invention along with
its additional
elements and advanta8es, it must be considered together with the figures he
description of
which Is provided below,
Figure-I Is the representative two-dimensional front sectional view of the d
bte waq tube.
Fi9ure-2 Is the representative two-dimensional front view of the snneall unit
for the tube
with at lesat one copper layer.
Figure-3 is the representative two-dimensional front view of the tube shapi
group.
Figure-4 is the representative two-dimensional front view of the horizontal s
ool group,
Figure-5 Is the representative two-dimensional side view of the annealing If
e.
Figure-6 Is the representative two-dimensional front view of the section A- of
the annealing
line.
REFERENCE NUMBERS
1. Tube
1.1. Steel 8heet Layer
.1.2. Copper Layer
AMENDED SHEET
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-20C
S
1.3. Joining Surfaces
2. Band Stand
3. Tube shaping group
3.1. Vertical spool group
3.2. Horizontal spool group
3.3. Vertical spool outiot group
4. Annedling unit
4.1. Furnace Group
4.2. Windiass Group
4.3. i.epkage test device
4.4, Tube Stand
5. Crushing group
6. Tunnel
7. Sheets
8. Band layer
9. Lin Net
1 Q. Spool
11. Bearing
T Annealing line
A Elongation Nne
DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, the present invention relates to the production
ethod for at least
double waHed steel tube with high corrosion resistance and strength.
Figure-1 provid s the representative two-dimensional front sectional view f
the double wall
tube (1) and Figure-2 provides the representative two-dimensional front vi of
the anneaiing
unit=(4) where the tube (1) with at least one copper layer (1.2) is fotmod.
Both surfaces of the steel sheet layer (1.1) Is coated with copper to b
used.in brazing
process, by means of the electrolysis m thod. The steei sheet layer (1.1) ated
with copper
layer (1.2) is sliced into the widths calculated beforehand theorotiraAy, fo
the production of
the tube (1) with desired diameter. After this stage, said steel she.t laye
(1.1) with copper
layer (1.2) takes the shape of the band layer (8) as shpwn in (Ciqure-3 a d
Figure-4. Band
layer (8) is a layer inciuding copper coated onto the steel sheet layer (1. .
The steel sheet
layer (1.1) with copper layer (1.2) in the form of band iayer (8) is wound in
e form of a roll in
AMENDED SHEET
CA 02699249 2010-03-10
, = PCT/TR 2008/000 103 - 10-07-200~
6
tt'>e .tube shaping group (3). The steel sheet tayer (11) with copper layer
1.2) wound In the
form of a roil of band layers (8) with suitable width is passed through t
shaping mandrel
groups (3.1, 3.2) placed one after the other, in order to cold-shape the sa e
in the form of a
tube (1) with the help of the mandrel (shaft). The tubes (1) with copper I yet
(1.2) seen In
Figure-1 are heated in the fumace group (4.1) at the meiting temperat re of
the copper
(about 11500C), and are joined to each other via their joining surface (1.3)
under the
protective gas (hydrogen) at a certain advance speed, in the fumace grou
(4.1), the copper,
the brazing materiai, is prevented from cooling down, while it is aiw pre
ented from being
oxidized under the gas atmosphere. Contrary to the state of the ert, th
diameters of the
spools are increased from 38 mm to 49 mm and the bearings (1.1) arQ al o
enlarged in the
spool groups (3.1, 3.2), which enabie the tube (1) to take a shape and are ted
in the tube
shaping group (3) called roil forming, thus the oscillation of the band Ia er
(8) is reduced
during when the tuba is (1) taking its shape and smoother sectional surta are
obtained. In
this way, ft becomes atso posiiWe to perform the production of the tubes ()
having an outer
disrn ter of 6.35 mm, e.p0 mm, 9.52 mm and 10.00 mm. The tube spinp group (3)
comprises at iaast eight vertical spool groups (3.1) and at least fivP horiz
tai spool groups
(3,2) placed on a steel tray wfth the size 2000x340 mm. At least seven o the
vertJcai spool
groups (3.1) are driven by means of a gearbox and cardan shafts. The firs
group comprises
the crushing group (5) carrying out the necessary crushing precess on the edge
of the band
fayer (8) and the connecting eiement of the mandrel wire calibrating the ins e
of the tube (1).
As seen in Figure-3, there is a front guide apparatus, which guides the nd
layer (8) and
retains the dirt such as stone pieces on the band layer (8). The spools of e
crushing group
(8) are formed such that they can perform the crushino at the necsasary o fe
on both sides
of the band layer (8). The band layer (8) Is first folded in the form of a wi
"U". As seen in
Figure-4, the fold remaining outside Is supported by means of the vertical
=poots (10) of the
horizontal spool groups (3.2), and the radius profiies ar$ folded by mean of
the horizontal
spoois (10) in accordance with the given tempietes. The horizontal s ols (10)
and the
vertical spoois (10) are adjusted such that the folding edge will follow a ine
(i.e. they are
adjusted such that the edge -emaining on the inside will advance on the same
level). The
tube (1) then pass s through the vertical spool outlet group (3.3) to ad nce
towards the
elongation iine (A) and then towards the annealing iine (T).
in Figura-5, the representative two-dimensionai side view of the ann ating
iine (T) is
provided, and in Figure-8, the reprasentative two-dimensional front view of e
section A-A of
the annealing iine (T) is provided. Contrary to the existing methods, ins ad
of contacting
with water at least two walled tube (1) coming out of the brazing process to
cool down the
same, the annealing unit (4) is extended by means of the annealing unit
Integrated with
AMENDED SHEET
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-200'
7
eiongation line (A) through which said tube (1) passes, and the conta of the
tube (1) Is
provided with the air, thus achieving a more controlled and slower cooi g of
the tube. In
order to provide cooiinq by means of air, the annealing iine (T) Is i eqrated
with the
elongation line (A) to cool down the tube (1). with at least two waiis d owing
to suCh
cooling, the increase in the hardness values is prevented, as well as av iding
the possibte
corrosive effects that the water, which is used for cooling and contacting the
tube (1), may
cause on the surface rnateriai. In said annealing iin (T), there are presen
he tunnel (6) and
the serpentine sheeta (7). As seen in Fiqure-5, the tunnel stands on feet (9)
in the
annealing line (T). In order to avoid an excessively long annealing line (T),
he tunnel forming
said annealing line (T) Is surrounded by steel sheets (7) and in this man ,
the surface area
of the tube (1) contacting the air Is increased. Then the cooled tubes (1) a e
passed through
the leakage test device (4.3) to subject the same to the leakage test. Th
tubes (1) having
been subjected to the leakage test are passed through the windlass pro (4.2)
puiling the
tube according to the machine speed and through the tubet stand (4.4), d thus
are made
] 5 ready for delivery.
As a reauit, in order to incrrosse the qualily and reduce the cost for the
production of the
copper-brazed tube (1) with at least one layer, the annealing line (T) is i
tegrated with the
previously existing elongation iine (A) (21.5 meters) so that the total tengt
of the elongation
line (A) and the anneaiing line (T) is increased to 55 meters, and the coo ng
of the copper-
coated (1.2) tubes (1) with at least 2 walls is provided by means of air, i
tead of water. In
eddition, with the eniarpement-of the spool (10) diameters and the bearin
s(11) in the tube
shaping group (3), the oscillation of the band layer (8) Is reduced during w
en the tube (1) is
taking Its shape and smoother sectional surfaces are obtained.
The invention is the production process for the metal tube (1) with at least o
walls, wherein
the copper Is coated onto especially the steel sheet iayer (1.1) by means f
the electrolysis
method; two waN tube (1) is obtained by stagewise advancing from the ob ined
sheet layer
(1.1) with copper layer (1.2), the obtained two waii tube (1) Is permitted to
each the brazing
temperature, then it is heated at the brazing temperature by means of the
electric contact
points located in a mobile and spaced manner from one another and d imiting a
heating
zone, and is joined by means of copper braze heated up to the occurren e of
the optimum
brazing, and wherein seid process comprises the process step of coolin the
tube (1) by
providing its contact with air for a longer time along the elongation line (A)
nd thm annealing
iine - (T) by means of the anneaiing line (T) being integrated with the eion
tion line (A), the
diameters of the spool$ (10) have a vaiue of 49 mm ~ 0.02 and the bearing (11)
have a size
AMENDED SHEET
CA 02699249 2010-03-10
PCT/TR 2008/000 103 - 10-07-200
8
In the range 31 mm t 0.02 to 38 mm t 0.02 so that the oscillation of t band
tayer (B) is
reduced in the tube shaping group (3) and smoother sectional surfaces ar
obtairwd.
The invention is the line, which has the band stand (2) carrying the pper-
coated steel
sheet, the vertir.sl spool group (3.1) and the horizontal spool group (3.2)
abiing said band
layers (8) to pass through said band stand (2) to take the shape of a tu (1),
the furnace
group (4,1) enabting the heating up to a temperature above the mefting int of
tiw copper
and preventing the cooling of the copper and also Its oxidation under th gas
atmospher+e,
the elongation line (A) enabling the tubes (1) to be transported to the i kage
test devioe
(4,3), wherein there is provided the annealing unit (4) having at least o e
annealing line
(1') being Integrated with the elongation line (A) to provide the contact of
he copper coated
tube with at ieast two walls (1) with the air, and also the vertical spool g
ups (3.1) and the
horizontal spool groups (3.2) are provided in said annealing unit (4) h ving
at least one
spool (10) with a size of 48 mm t 0.02 and at least one bearing (11) with size
in the range
31 mm 10.02 to 38 mm 10.02, in order to docrease the osciilation of said and
layer (8) and
to enable smoother sectional surfaces to be obtained, and there are tso
provided the
tunnel (6) through which the tube (1) passes in the annealing line (T), and t
least one shest
(7) around said tunnel (6), which onablea to avoid an exeessiveiy long ann
aiing line (T) and
to increase the surface of the copper-coaled lube with at least one layer
contact. with the
air, said steel (7) being made of steel sheet.
The protective scope of this application is detemiined in the sectlon of cla s
and the scope
may by no means be limited to the description above provided only for e mplary
purposes.
It Is obvious that a person skilled in the art may provide the Innovation t
forward by the
invvntion aiso by using the similar embodiments and/or apply this embodi ent
to other fields
with similar purpose used In the relevant art. Consequently, such o odiments
would
obviousiy tack the criterion of innovative step, and especially the criterio
of exceeding the
state of the art.
AMENDED SHEET
