DE112008002490T5 - Process for the production of copper brazed double-walled steel tubes by means of a glowing method with a long cooling section - Google Patents

Abstract

The invention is the production process for the metal pipe (1) with at least two walls, wherein the copper is coated on the steel sheet layer (1.1) by the electrolysis process, a two-walled tube (1) by advancing stepwise from the obtained sheet metal layer (1.1) with the copper layer (1.2), the resulting two-walled tube (1) is allowed to reach the brazing temperature, then heated at the brazing temperature by means of the two electrical contact points arranged in a movable and spaced manner and defining a heating zone , and is connected by means of a copper solder, which is heated until the occurrence of the optimum brazing, the process being characterized in that
It includes the step of cooling the tube (1) by providing its contact with air for a longer time along the extension path (A) and the annealing cooling path (T) by passing the annealing cooling path (T) with the extension path (A) is summarized.

Description

TECHNICAL AREA

The The invention relates to the production process for a metal pipe having at least two walls by means of a Kupferlötverfahrens be joined together.

Of the inventively developed manufacturing process includes the process steps of air cooling the pipe by means of the combined with the extension track Annealing cooling line, covering the tunnel, which the Incandescent cooling line forms, with serpentines, such that the Glühkühlstrecke is not too long, and in the tube forming group, increasing the diameter of the Rollers and the bearing that allow the tubes to be shaped, so that the vibration of the band layer is reduced when the Tube takes a shape and smoother cross-sectional areas be achieved.

STATE OF THE ART

The Stainless steel material used in today's industry is becoming widely used preferred because of its high corrosion and oxidation resistance, high mechanical and physical properties, hot and Cold workability and weldability. To corrosion Avoid the steel sheets are used after the corrosion resistance their surface was increased. The steel material manufactured steel sheets are generally used in the production of Steel tubes used. Sheet steel pipes have a very wide range of uses, especially as brake and fuel pipes in the automotive sector and also as condenser tube in the fridge, the washing machine and the dishwasher; thus, for her with water and moisture contacting surfaces for Corrosion resistance can be taken care of.

The chemical decomposition, which is an electrolyte under the influence of a electric current is called electrolysis. Electrolysis develops together with the management of the electricity within the electrolyte. An electrolyte is common in dissolved form or in the form of an aqueous Saline solution available. Both surfaces of the steel sheet are electrolytically coated with copper in a soldering process should be used. The copper-coated steel sheet is in cut the shape of ribbons that are for the production of the tube with the desired diameter previously theoretically calculated width, and the bands are wound up in the form of rolls. The copper-coated Sheet metal strips leading to the ribbons with the corresponding Width cut and wrapped are done in succession Placed forming rollers performed, and it becomes them allowed to adopt the tube shape in the cold process by means of the mandrel.

The Copper-coated, double-walled tubes become conductive heated to a temperature (~ 1150 °), the is above the melting temperature of copper, and with each other under protective gas (hydrogen) at a certain feed rate soldered in the heating unit. In the heating unit is the copper, d. H. the soldering material, cool at the Ab prevented, and it is prevented by means of the gas atmosphere, that it oxidizes. One of the soldering processes is done by moving Contact units, while the other by means of stationary Contact units takes place.

To the prior art occurs after soldering, the copper-coated Steel sheet in the form of a tube in the glowing unit, and the pipe is watered at the end of the route to To provide cooling. The hot copper-coated Steel tube is a fast at the end of the glowing unit Subjected to cooling process under water action.

To The prior art increases due to the above Reasons the costs, and the quality decreases yourself.

Nowadays, the existence of the processes relating to the brazing of steel sheets is known. One of these methods, which is described in document no. JP7258886 discloses the electroplating of the steel layer by means of spot weldability. This document relates to a steel sheet with increased weldability, which can be used in industry with high efficiency.

Another method in Publication No. 2005/02248 relates to the units in which soldering is provided according to automation by converting the steel sheet raw material from the strip shape to the cylindrical shape. According to this method, the invention relates to the units in which the soldering is carried out according to automation, by converting the stainless steel sheet raw material from the strip shape into cylindrical tubes. The pattern executed as unit 1, unit 2 and unit 3 comprises a strip raw material inlet ( 1 ), a Castamidlaufrolle ( 2 ), Rope ( 3 ), Castamide ( 4 ), Welding torches ( 5 ), Diamond tip ( 6 ) and tube outlet ( 7 ). The units can be moved to the right, left, up and down, and your degrees can be adjusted as well. Castamide ( 4 ) is used in Unit 1, Unit 2 and Unit 3. The rope ( 3 ), which gives shape to the material used, allows the smooth running of the material. In unity 3 becomes the rounded metallic diamond point ( 6 ) made of castamide with a corrosion time of 6 months is made. The storage is carried out by means of this diamond tip ( 6 ) to allow the molded material to pass to the weld in a continuous and uniform manner.

The patent no. US2003012909 refers to the double-walled tubes having a polyamide-based layer on their inside and an outer layer formed of a material selected from polyetherester, polyesterether and fluoroelastomer.

The patent no. US2003041912 refers to that the tubes used in the transport of the fluids comprise a steel inner layer, a steel outer layer encasing the inner layer, and an end piece made of weldable steel.

however The double-walled pipes are not able to provide the necessary To provide strength. Further, additional work occurs and loss of time during the production steps for the pipes open, the costs increase, and the water consumption is very high high.

in the Result, it made the presence of the need for the high-strength, double-walled pipes, which are the disadvantages of the prior art eliminate, and the inadequacy of existing ones Solutions needed, an improvement in this respect State of the art.

OBJECT OF THE INVENTION

The The present invention relates to the method of manufacture the metal tubes with at least two walls, the above Requirements met, all the disadvantages eliminated, and some creates additional benefits.

It The object of the invention is a production method for specify a metal pipe that is a more controlled and slower Cooling made possible by the at least double-walled Pipe within the route it passes through due cooling the extension of the route by means of air, rather than the copper-clad and at least double-walled tube, which comes from the soldering process, in contact with water bring.

It is the object of the invention, both by the air cooling to prevent the increase of hardness values of metal pipes and the possible corrosive effects of the water, which is used for cooling purposes and with the Tube comes into contact, on the surface of the material to avoid.

In order to the cooling in the winders at the end of the route reach the temperature by means of the cooling process With water it is possible to reach the cooling section be extended. To an excessive Length of the cooling section to avoid the tunnel, which forms part of the glowing unit, with serpentine sheets wrapped around, and in this way becomes the air-contacting Surface enlarged.

It Another object of the invention is the vibration of the tape to reduce during the time that the tube takes shape, and thus make it possible to have smoother cross-sectional areas to obtain.

It is another object of the invention, the quality of To increase production and of the product.

It Another object of the invention is to reduce costs.

It Another object of the invention is the manufacture of the tubes with a larger outer diameter. This increases the product diversity.

Around all the aforesaid advantages, which are detailed from the following Description can be understood, achieved, achieved it is the present invention that the tube is cooled, for its contact with the air by means of the annealing cooling section, taken care of with the extension track is, wherein the annealing cooling section forming tunnel covered by serpentine plates, so the annealing cooling section is not overly long, so the Heat transfer rate increased can be. Furthermore, in the tube forming group, the diameters of Rollers and bearings that allow the tube to take shape, enlarged so that the vibration of the band layer is reduced as the tube assumes its shape, and smoother cross-sectional areas are obtained.

The structural and characteristic features and all the benefits The invention will be more apparent from the attached Drawings and the detailed written in relation to the figures Description, and therefore the evaluation must be taken into account These figures and the detailed description are made.

BRIEF DESCRIPTION OF THE FIGURES

In order to best understand the embodiment of the present invention, together with its additional elements and advantages, it must be considered together with the figures, the description of which is given below.

1 is the representative two-dimensional front sectional view of the double-walled tube.

2 is the representative two-dimensional front view of the annealing unit for the tube with at least one copper layer.

3 : is the representative two-dimensional front view of the tube forming group.

4 : is the representative two-dimensional front view of the horizontal roller group.

5 is the representative two-dimensional side view of the annealing cooling section.

6 is the representative two-dimensional front view of section AA of the annealing cooling section.

1

pipe

1.1

Steel sheet layer

1.2

copper layer

1.3

connecting surfaces

2

belt frame

3

Pipe forming group

3.1

vertical roll group

3.2

horizontal roll group

3.3

vertical Walzenauslassgruppe

4

annealing unit

4.1

oven group

4.2

wind group

4.3

Undichtigkeitstestgerät

4.4

tubular frame

5

oppressive group

6

tunnel

7

sheets

8th

tape layer

9

Route feet

10

roller

11

camp

T

annealing line

A

extension route

DETAILED DESCRIPTION THE INVENTION

In This detailed description relates to the present invention on the manufacturing process for an at least double-walled Steel pipe with high corrosion resistance and strength.

1 shows the representative two-dimensional front sectional view of the double-walled tube ( 1 ), and 2 shows the representative two-dimensional front view of the glowing unit ( 4 ), in which the pipe ( 1 ) with at least one copper layer ( 1.2 ) is formed.

Both surfaces of the steel sheet layer ( 1.1 ) are coated by means of the electrolysis method with copper, which is to be used in the soldering process. The with the copper layer ( 1.2 ) coated steel sheet layer ( 1.1 ) is used for the production of the tube ( 1 ) with the desired diameter into the previously theoretically calculated width. After this stage, the steel sheet layer ( 1.1 ) with the copper layer ( 1.2 ) the shape of the band layer ( 8th ), as in 3 and 4 shown. The band layer ( 8th ) is a layer on the steel sheet layer ( 1.1 ) comprises deposited copper. The sheet steel layer ( 1.1 ) with the copper layer ( 1.2 ) in the form of a band layer ( 8th ) is in the form of a roll in the tube forming group ( 3 ) wound up. The sheet steel layer ( 1.1 ) with the copper layer ( 1.2 ) in the form of a roll of tape layers ( 8th ) is wound with a suitable width is, by the successively placed forming mandrel groups ( 3.1 . 3.2 ) to the same by means of the mandrel (shank) in the form of a tube ( 1 ) cold forming. In the 1 shown pipes ( 1 ) with copper layer ( 1.2 ) are stored in the oven group ( 4.1 ) are heated to the melting temperature of copper (about 1150 ° C) and are passed over their bonding surfaces ( 1.3 ) under the inert gas (hydrogen) at a certain feed rate. In the oven group ( 4.1 ), the copper, ie, the solder, is prevented from cooling, while also being prevented from being oxidized under the gas atmosphere. In contrast to the prior art, the diameters of the rolls are increased from 38 mm to 49 mm, and the bearings ( 11 ) are in the roll groups ( 3.1 . 3.2 ), that is, in the rolling groups, which are the pipe ( 1 ) allow to assume a shape, and the tube forming group mentioned in the roll forming ( 3 ) are arranged; thus the oscillation of the band layer ( 8th ) while the pipe ( 1 ) assumes its shape, and smoother cross-sectional areas are obtained. In this way it is also possible, the production of the pipes ( 1 ) with an outer diameter of 6.35 mm, 8.00 mm, 9.52 mm and 10.00 mm. The tube forming group ( 3 ) comprises at least eight vertical groups of rolls ( 3.1 ) and at least five horizontal roller groups ( 3.2 ), which are placed on a steel base with the size 2000 × 340 mm. At least seven of the vertical roll groups ( 3.1 ) are driven by means of a transmission and cardan shafts. The first group comprises the push group ( 5 ), the necessary pressing process at the edge of the band layer ( 8th ), and the connecting element of the mandrel wire, the inside of the tube ( 1 ) calibrated. As in 3 to see, there there is a front guide device that the band layer ( 8th ) and the dirt, such as pieces of stone, from the belt layer ( 8th ) keeps away. The rollers of the spinning group ( 5 ) are designed such that they can be pressed at the necessary angle on both sides of the band layer (FIG. 8th ). The band layer ( 8th ) is first folded into the shape of a broad "U". As in 4 can be seen, the outside remaining fold by means of the vertical rollers ( 10 ) of the horizontal roll groups ( 3.2 ) and the radius profiles are determined by means of the horizontal rollers ( 10 ) folded according to the given templates. The horizontal rollers ( 10 ) and the vertical rollers ( 10 ) are set so that the fold corner follows a line (ie, they are adjusted so that the edge remaining on the inside advances at the same level). Then the pipe goes through ( 1 ) the vertical roll outlet group ( 3.3 ) to advance to the extension section (A) and then to the annealing cooling section (T).

In 5 the representative two-dimensional side view of the annealing cooling section (T) is shown, and in 6 2, the representative two-dimensional front view of the portion AA of the annealing cooling path (T) is shown. In contrast to the existing method, instead of the at least double-walled tube ( 1 ), which comes from the soldering process, to bring into contact with water to cool it, the glowing unit ( 4 ) by means of the annealing cooling section (T), which is combined with the extension section (A) through which the tube passes through, extends, and it is for contact of the tube ( 1 ) with air, whereby a controlled and slower cooling of the tube is achieved. In order to provide cooling by means of the air, the annealing cooling section (T) is combined with the extension section (A) to the pipe ( 1 cooling with at least two walls, and due to such cooling, the increase of the hardness values is prevented, as well as the possible corrosive effects that the water used to cool the pipe ( 1 ) and is brought into contact therewith, on which surface material may cause. In the annealing cooling section (T), the tunnel ( 6 ) and the serpentine plates ( 7 ) available. As in 5 to see the tunnel stands on feet ( 9 ) in the annealing cooling section (T). In order to avoid an excessively long annealing cooling section (T), the tunnel forming the annealing cooling section (T) is made of steel sheets ( 7 ), and in this way the air contacting surface of the tube ( 1 ). Then the cooled pipes ( 1 ) through the leak tester ( 4.3 ) to subject them to leak testing. After the pipes ( 1 ) have been subjected to a leak test, they are replaced by the 4.2 ), which pulls the pipe according to the machine speed, and through the pipe frame ( 4.4 ) and thus made ready for delivery.

As a result, in order to increase the quality and to reduce the cost of producing the copper-brazed tube ( 1 ) is combined with at least one layer the Glühkühlstrecke (T) with the previously existing extension section (A) (21.5 meters), so that the total length of the extension section (A) and the Glühkühlstrecke (T) is increased to 55 meters, and the cooling the copper-coated ( 1.2 ) Pipes ( 1 ) with at least 2 walls is accomplished by air, instead of water. Furthermore, as the diameter of the rolls ( 10 ) and the bearings ( 11 ) in the tube forming group ( 3 ) the vibration of the band layer ( 8th ), while the pipe ( 1 ) assumes its shape, and smoother cross-sectional areas are obtained.

The invention is the production process for the metal pipe ( 1 ) with at least two walls, wherein the copper in particular on the steel sheet layer ( 1.1 ) is layered by the electrolysis process, a two-walled tube ( 1 ) by stepwise advancing from the obtained sheet metal layer ( 1.1 ) with the copper layer ( 1.2 ) obtained it the obtained, two-walled pipe ( 1 ) is then allowed to reach the soldering temperature, then heated at the soldering temperature by means of the two electrical contact points, arranged in a movable and spaced manner, defining a heating zone, and connected by means of a copper solder until the optimum Soldering, and wherein the process comprises the process step, the pipe ( 1 ) is cooled by providing its contact with air for a longer time along the extension path (A) and the Glühkühlstrecke (T) by the Glühkühlstrecke (T) is combined with the extension section (A), the diameter of the rollers ( 10 ) have a value of 49 mm ± 0.02, and the bearings ( 11 ) have a size in the range of 31 mm ± 0.02 to 38 mm ± 0.02, so that the vibration of the band layer ( 8th ) in the tube forming group ( 3 ) and smoother cross-sectional areas are obtained.

The invention is the track that carries the copper frame ( 2 ), the vertical roll group ( 3.1 ) and the horizontal roll group ( 3.2 ), which allow the tape layers ( 8th ) allow the belt frame ( 2 ) to take the shape of a tube ( 1 ), the furnace group ( 4.1 ), which allows heating to a temperature above the melting point of the copper and prevents the cooling of the copper and also its oxidation under the gas atmosphere, the extension distance (A), which it the tubes ( 1 ) to the leak tester ( 4.3 ), the glowing unit ( 4 ) is provided with at least one Glühkühlstrecke (T), with the extension section (A) to is summarized for the contact of the copper-coated tube with at least two walls ( 1 ) with the air, and also the vertical roll groups ( 3.1 ) and the horizontal roll groups ( 3.2 ) are in the glowing unit ( 4 ) provided with at least one roller ( 10 ) with a size of 49 mm ± 0.02 and at least one bearing ( 11 ) having a size in the range of 31 mm ± 0.02 to 38 mm ± 0.02 in order to control the vibration of the band layer ( 8th ) and to make it possible to obtain smoother cross-sectional areas, as well as the tunnel ( 6 ) through which the pipe ( 1 ) in the Glühkühlstrecke (T) passes through, and at least one sheet ( 7 ) around the tunnel ( 6 ), which enables the avoidance of an excessively long annealing cooling path (T) and the increase of the surface of the copper-coated tube with at least one layer in contact with the air, wherein the steel ( 7 ) consists of sheet steel.

Of the Scope of this application is in the section with the claims determined, and the scope must by no means be limited to the above description which is provided for the purpose of example. It is obvious, that a person skilled in the art also proposes the innovation proposed by the invention through the use of similar embodiments can provide, and / or this embodiment can use other areas with a similar purpose, with which it is used in the relevant state of the art. As a result, would such embodiments, the criterion of the inventive Step, and in particular the criterion of going over the state of the art.

SUMMARY

The invention is the manufacturing process for the metal pipe 1 with at least two walls, with the copper on the sheet steel layer 1.1 layered by the electrolysis process, a two-walled pipe 1 from the obtained sheet metal layer 1.1 with the copper layer 1.2 obtained, it the obtained, two-walled pipe 1 is allowed to reach the soldering temperature, it is then heated at the soldering temperature and connected by means of a copper solder, which is heated until the occurrence of the optimum soldering, the invention refers to that the tube 1 is cooled by providing its contact with air along the extension path A and the Glühkühlstrecke T by the Glühkühlstrecke (T) is combined with the extension section A.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 7258886 [0008]
• US 2003012909 [0010]
• US 2003041912 [0011]

Claims (7)

The invention is the production process for the metal pipe ( 1 ) with at least two walls, the copper being deposited on the steel sheet layer ( 1.1 ) is layered by the electrolysis process, a two-walled tube ( 1 ) by stepwise advancing from the obtained sheet metal layer ( 1.1 ) with the copper layer ( 1.2 ) is obtained, the resulting, two-walled tube ( 1 ) is then allowed to reach the soldering temperature, then heated at the soldering temperature by means of the two electrical contact points, arranged in a movable and spaced manner, defining a heating zone, and connected by means of a copper solder until the optimum Is heated, the process being characterized in that - it includes the step of 1 ) is cooled by providing its contact with air for a longer time along the extension section (A) and the Glühkühlstrecke (T) by the Glühkühlstrecke (T) is combined with the extension section (A). The manufacturing process according to claim 1, characterized in that the diameters of the rolls ( 10 ) have a value of 49 mm ± 0.02, and the bearings ( 11 ) have a size in the range of 31 mm ± 0.02 to 38 mm ± 0.02, so that the vibration of the band layer ( 8th ) in the tube forming group ( 3 ) and smoother cross-sectional areas are obtained. The invention is the track that carries the copper frame ( 2 ), the vertical roll group ( 3.1 ) and the horizontal roll group ( 3.2 ), which allow the tape layers ( 8th ) allow the belt frame ( 2 ) to take the shape of a tube ( 1 ), the furnace group ( 4.1 ), which allows the heating to a temperature above the melting point of the copper and prevents the cooling of the copper and also its oxidation under the gas atmosphere, the extension distance (A), which it the tubes ( 1 ) to the leak tester ( 4.3 ), characterized in that they contain the glowing unit ( 4 comprising at least one annealing cooling section (T), which is combined with the extension section (A) in order for the contact of the copper-coated tube with at least two walls ( 1 ) to take care of the air. The track according to claim 3, characterized in that it supports the vertical roller groups ( 3.1 ) and the horizontal roll groups ( 3.2 ) in the glowing unit ( 4 ) comprising at least one roller ( 10 ) with a size of 49 mm ± 0.02 and at least one bearing ( 11 ) having a size in the range of 31 mm ± 0.02 to 38 mm ± 0.02 in order to control the vibration of the band layer ( 8th ) and to allow the maintenance of smoother cross-sectional areas. The route according to claim 3, characterized in that it supports the tunnel ( 6 ) through which the pipe ( 1 ) in the annealing section (T). The track according to claim 5, characterized in that it comprises at least one sheet ( 7 ) around the tunnel ( 6 ) which prevents the avoidance of an excessively long annealing cooling path (T) and the increase of the surface of the copper-clad tube with at least one layer in contact with the air. The track according to claim 5, characterized in that the sheet ( 7 ) is the steel sheet.