EP1601472A1 - Method for treating the inner surface of a tube - Google Patents

Method for treating the inner surface of a tube

Info

Publication number
EP1601472A1
EP1601472A1 EP04713921A EP04713921A EP1601472A1 EP 1601472 A1 EP1601472 A1 EP 1601472A1 EP 04713921 A EP04713921 A EP 04713921A EP 04713921 A EP04713921 A EP 04713921A EP 1601472 A1 EP1601472 A1 EP 1601472A1
Authority
EP
European Patent Office
Prior art keywords
tube
cleaning treatment
extruded tube
extruded
final size
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.)
Granted
Application number
EP04713921A
Other languages
German (de)
French (fr)
Other versions
EP1601472B1 (en
Inventor
Terho Harju
Aleksi Salminen
Timo Nor N
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8565774&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1601472(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of EP1601472A1 publication Critical patent/EP1601472A1/en
Application granted granted Critical
Publication of EP1601472B1 publication Critical patent/EP1601472B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/0436—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided with mechanical cleaning tools, e.g. scrapers, with or without additional fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, rods or tubes
    • B21C23/085—Making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass

Definitions

  • the invention relates to a method according to claim 1 for manufacturing a copper or copper alloy tube.
  • the invention relates to a cleaning treatment carried out on the inner surface of an extruded tube before the tube is worked to its final size.
  • a solid metal billet is by means of a mandrel worked to the form of a tube.
  • lubricating the mandrel surface there are used for instance graphite-based materials, the contents of which may be harmful in the further processing of the tubes.
  • Hot extruded tube billets, i.e. extruded tubes are thereafter drawn to their final size. After extrusion, the extruded tubes can also be worked to their final size by rolling.
  • oil-based lubricating materials which may leave carbon-bearing impurities on the inner surface of the tube. It is well known that the lengthwise grooves created on the inner surface of an extruded tube may form fold-backs in the tube drawing steps. Lubricating materials used both in the extrusion and in the drawing steps can remain in said fold-backs. It has generally been found out that the carbon content of the inner surfaces cannot necessarily be adjusted to the required level by means of known degreasing washings or other solvent treatments, which causes problems for instance in the metal coating of the inner surface. Especially problems have been detected for example in the adhesion of a tin coating.
  • the object of the present invention is to introduce a novel method for manufacturing copper or copper alloy tubes, in which method the inner surface of the extruded tube is subjected to a cleaning treatment before the tube is worked to its final size.
  • the invention relates to a method for manufacturing copper or copper alloy tube, which method includes an extrusion step and at least one working step for working the tube to its final size, and according to which method, the tube inner surface is subjected to a cleaning treatment, so that the cleaning treatment is performed on the inner surface of the extruded tube before the tube is worked to its final size.
  • a tube means an end product.
  • it is possible to essentially improve the quality of the inner surface of metal tubes, such as copper tubes.
  • a tube is worked to its final size by drawing an extruded tube at least in one step.
  • the cleaning treatment is carried out essentially between the extrusion step and the drawing step.
  • the tube is worked to its final size by rolling the extruded tube at least in one step. Now the cleaning treatment is carried out essentially between the extrusion step and the rolling step.
  • the cleaning treatment is carried out mechanically.
  • One method according to the invention is that the cleaning treatment is carried out by treating the inner surface of the extruded tube with a cleaning device that is made of an essentially harder material than the inner surface.
  • the employed cleaning device is a steel brush. In this fashion, impurities are advantageously detached from the inner surface.
  • the cleaning device is moved along the inner surface of the extruded tube by means of magnets.
  • the cleaning device is moved along the inner surface of the extruded tube by means of an elongate shaft.
  • the extruded tube is moved with respect to the cleaning device.
  • the cleaning treatment is carried out by grain blasting, such as sand blasting.
  • the inner surfaces of the extruded tube are blasted by gas.
  • Another way according to the invention is that after a mechanical cleaning treatment, the inner surfaces of the extruded tube are washed by liquid.
  • the tube is subjected to a coating treatment after working the tube to its final size.
  • An extruded tube treated according to the invention makes it easier to perform further processing, such as metal coating.
  • further processing such as metal coating.
  • the carbon content of the inner surfaces of tube end products can be controlled better than in the prior art.
  • savings in the expenses are achieved both in employed work and materials, as well as in the pretreatment steps that require metal coating.
  • the processing of a tube that in the final measures has an outer diameter of 54 millimeters from an extruded tube by applying the method according to the invention.
  • the example describes how the inner surface of the extruded tube was cleaned, and how the cleaned extruded tube behaved in test drawings in comparison with a regular uncleaned extruded tube. After test drawings and washings, the inner surface was observed by various different surface test methods. In addition, there was observed the metallic coatability of tubes manufactured according to the invention.
  • the tubes under comparison were subjected to a degreasing, pickling and coating treatment.
  • the layer thickness of a metallic coating was larger by about 20%, and the parameter describing the adhesion and integrity of the coating was over 5 times better in the tube that was made of the mechanically cleaned extruded tube. It was also found out that in the case of an uncleaned extruded tube, the graphite-containing drawing grooves on the inner surface were clearly visible in the coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Physical Vapour Deposition (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention relates to a method for manufacturing copper or copper alloy tube, which method includes an extrusion step and at least one working step in order to work the tube to its final size, and according to which method the inner surface of the tube is subjected to a cleaning treatment. According to the method, the cleaning treatment is carried out on the inner surface of the extruded tube before the tube is worked to its final size.

Description

METHOD FOR TREATING THE INNER SURFACE OF A TUBE
The invention relates to a method according to claim 1 for manufacturing a copper or copper alloy tube. In particular, the invention relates to a cleaning treatment carried out on the inner surface of an extruded tube before the tube is worked to its final size.
When extruding seamless metal tubes, such as copper tubes, a solid metal billet is by means of a mandrel worked to the form of a tube. When lubricating the mandrel surface, there are used for instance graphite-based materials, the contents of which may be harmful in the further processing of the tubes. Hot extruded tube billets, i.e. extruded tubes, are thereafter drawn to their final size. After extrusion, the extruded tubes can also be worked to their final size by rolling.
In the drawing steps, there are generally used oil-based lubricating materials, which may leave carbon-bearing impurities on the inner surface of the tube. It is well known that the lengthwise grooves created on the inner surface of an extruded tube may form fold-backs in the tube drawing steps. Lubricating materials used both in the extrusion and in the drawing steps can remain in said fold-backs. It has generally been found out that the carbon content of the inner surfaces cannot necessarily be adjusted to the required level by means of known degreasing washings or other solvent treatments, which causes problems for instance in the metal coating of the inner surface. Especially problems have been detected for example in the adhesion of a tin coating. All in all, it would be important to affect the properties of the inner surface already at the beginning of the tube manufacturing process, in order to even out the grooves created in the tube inner surface already at the extruding step, and to remove all graphite residues therefrom. From the publication EP 335999 there is known a cleaning method for cleaning a copper tube manufactured by drawing. The method relates to the removal of lubricant greases after the drawing by means of sand blasting.
From the FI patent application 20001467 there is known a method for coating the inner surface of copper or copper alloy tubes by a protecting film, particularly tin film, in which method the coating step is preceded by a mechanical treatment of the surface to be coated.
The object of the present invention is to introduce a novel method for manufacturing copper or copper alloy tubes, in which method the inner surface of the extruded tube is subjected to a cleaning treatment before the tube is worked to its final size.
The invention is characterized by what is set forth in the characterizing part of claim 1. Other preferred embodiments of the invention are characterized by what is set forth in the other claims.
Remarkable advantages are achieved by means of the method according to the invention. The invention relates to a method for manufacturing copper or copper alloy tube, which method includes an extrusion step and at least one working step for working the tube to its final size, and according to which method, the tube inner surface is subjected to a cleaning treatment, so that the cleaning treatment is performed on the inner surface of the extruded tube before the tube is worked to its final size. Here a tube means an end product. By means of the invention, it is possible to essentially improve the quality of the inner surface of metal tubes, such as copper tubes. According to a preferred embodiment of the invention, a tube is worked to its final size by drawing an extruded tube at least in one step. In this case the cleaning treatment is carried out essentially between the extrusion step and the drawing step. According to a preferred embodiment of the invention, the tube is worked to its final size by rolling the extruded tube at least in one step. Now the cleaning treatment is carried out essentially between the extrusion step and the rolling step. When the inner surface of a hot extruded tube billet, i.e. an extruded tube, is cleaned essentially before working the tube to its final size, there is achieved a tube end product with an excellent carbon content.
According to a preferred embodiment of the invention, the cleaning treatment is carried out mechanically. One method according to the invention is that the cleaning treatment is carried out by treating the inner surface of the extruded tube with a cleaning device that is made of an essentially harder material than the inner surface. Thus also graphite-based impurities are advantageously removed. According to an embodiment of the invention, the employed cleaning device is a steel brush. In this fashion, impurities are advantageously detached from the inner surface. According to an embodiment of the invention, the cleaning device is moved along the inner surface of the extruded tube by means of magnets. According to another embodiment, the cleaning device is moved along the inner surface of the extruded tube by means of an elongate shaft. According to an embodiment, in the cleaning treatment the extruded tube is moved with respect to the cleaning device. One way according to the invention is that the cleaning treatment is carried out by grain blasting, such as sand blasting. By treating the inner surface of the extruded tube created in the extrusion step, i.e. the so-called first inner surface of the tube, mechanically, the grooves created in the tube surface during the extrusion are evened out, and the graphite residues are removed. Consequently, it is not anymore - neither in the extrusion step nor in any further processing steps - necessary to take into account the possible circulation of graphite and carbon contaminations to the end product, but it is possible to concentrate on other matters that are important for the process.
According to the invention, after a mechanical cleaning treatment, the inner surfaces of the extruded tube are blasted by gas. Another way according to the invention is that after a mechanical cleaning treatment, the inner surfaces of the extruded tube are washed by liquid. According to an embodiment of the invention, the tube is subjected to a coating treatment after working the tube to its final size.
An extruded tube treated according to the invention makes it easier to perform further processing, such as metal coating. In addition, it is possible to achieve on the surface such carbon contents that comply to the regulations. By applying the method, the carbon content of the inner surfaces of tube end products can be controlled better than in the prior art. Moreover, savings in the expenses are achieved both in employed work and materials, as well as in the pretreatment steps that require metal coating. By cleaning the initial tube that feeds the whole production process, all further processes up to the end product are remarkably facilitated as regards the requirements for surface cleanness.
The invention is described in more detail below with reference to the appended example.
Example
In the example, there is observed the processing of a tube that in the final measures has an outer diameter of 54 millimeters, from an extruded tube by applying the method according to the invention. The example describes how the inner surface of the extruded tube was cleaned, and how the cleaned extruded tube behaved in test drawings in comparison with a regular uncleaned extruded tube. After test drawings and washings, the inner surface was observed by various different surface test methods. In addition, there was observed the metallic coatability of tubes manufactured according to the invention.
In the extrusion step, all graphite residues and grooves left on the inner surface of the extruded tubes were removed by a cleaning device made of steel. The graphite ingredients were detached by manually rotating the cleaning device along the inner surfaces of the extruded tubes, whereafter the extruded tubes were blasted by pressurized air. The mechanically cleaned extruded tubes were transported to drawing. As a result, it was found out that in the first drawing, a cleaned extruded tube requires a drawing force that is about 5% higher than with an uncleaned extruded tube. After the first drawing, drawing behavior does not differ from the drawing behavior of regular uncleaned extruded tubes.
The qualities of the inner surfaces of a regular uncleaned extruded tube and of a mechanically cleaned extruded tube were compared after the drawings, both visually and by various different surface test methods. The visual observations already showed that after drawings, the surface of the mechanically cleaned extruded tube had a remarkably higher quality. By applying spectroscopic surface test methods, it was found out the after drawings, in the mechanically cleaned extruded tube the carbon content of the inner surface of the tube end product was only a tenth part of the quantity that is after drawings represented on the inner surfaces of an end product of a regular extruded tube. The results were obtained by comparing the percentage shares of carbon, oxygen and copper on the inner surfaces.
By comparing the above mentioned results with an observation system where the atomic percentage shares of the elements of the inner surface are studied as functions of depth, there is also detected that at a given depth, the mechanically cleaned inner surface contains a remarkably lower degree of carbon than the uncleaned inner surface.
In the end, the tubes under comparison were subjected to a degreasing, pickling and coating treatment. The layer thickness of a metallic coating was larger by about 20%, and the parameter describing the adhesion and integrity of the coating was over 5 times better in the tube that was made of the mechanically cleaned extruded tube. It was also found out that in the case of an uncleaned extruded tube, the graphite-containing drawing grooves on the inner surface were clearly visible in the coating.
Various different methods and visual observations for defining the surface carbon content prove that by using the method according to the invention, there is achieved the best inner surface quality in the end product.
For a man skilled in the art, it is obvious that the different modifications of the invention are not restricted to the above described examples, but may vary within the scope of the appended claims.

Claims

1. A method for manufacturing copper or copper alloy tube, which method includes an extrusion step and at least one working step in order work the tube to its final size, and according to which method, the inner surface of the tube is subjected to a cleaning treatment, characterized in that the cleaning treatment is carried out on the inner surface of the extruded tube before the tube is worked to its final size.
2. A method according to claim 1 , characterized in that the tube is worked to its final size by drawing the extruded tube at least in one step.
3. A method according to claim 1 or 2, characterized in that the cleaning treatment is carried out essentially between the extrusion step and the drawing step.
4. A method according to claim 1 , characterized in that the tube is worked to its final size by rolling the extruded tube at least in one step.
5. A method according to claim 1 or 4, characterized in that the cleaning treatment is carried out essentially between the extrusion step and the rolling step.
6. A method according to claim 1 , 3 or 5, characterized in that the cleaning treatment is carried out mechanically.
7. A method according to claim 6, characterized in that the cleaning treatment is carried out by treating the inner surface of the extruded tube with a device made of a material that is essentially harder than the inner surface.
8. A method according to claim 7, characterized in that the employed cleaning device is a steel brush.
9. A method according to claim 7 or 8, characterized in that the cleaning device is moved along the inner surface of the extruded tube by means of magnets.
10. A method according to claim 7 or 8, characterized in that the cleaning device is moved along the inner surface of the extruded tube by means of an elongate shaft.
11. A method according to claim 7 or 8, characterized in that the in the cleaning treatment, the extruded tube is moved with respect to the cleaning device.
12. A method according to claim 6, characterized in that the cleaning treatment is carried out by grain blasting, such as sand blasting.
13. A method according to claim 6 - 12, characterized in that after the mechanical cleaning treatment, the inner surfaces of the extruded tube are blasted by gas.
14. A method according to claim 6 - 12, characterized in that after the mechanical cleaning treatment, the inner surfaces of the extruded tube are washed by liquid.
15. A method according to any of the preceding claims, characterized in that the tube is subjected to a coating treatment after working the tube to its final size.
EP04713921A 2003-03-07 2004-02-24 Method for treating the inner surface of a tube Revoked EP1601472B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20030344A FI115120B (en) 2003-03-07 2003-03-07 Procedure for treating the inside of a pipe
FI20030344 2003-03-07
PCT/FI2004/000086 WO2004078372A1 (en) 2003-03-07 2004-02-24 Method for treating the inner surface of a tube

Publications (2)

Publication Number Publication Date
EP1601472A1 true EP1601472A1 (en) 2005-12-07
EP1601472B1 EP1601472B1 (en) 2008-03-19

Family

ID=8565774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04713921A Revoked EP1601472B1 (en) 2003-03-07 2004-02-24 Method for treating the inner surface of a tube

Country Status (8)

Country Link
EP (1) EP1601472B1 (en)
AT (1) ATE389466T1 (en)
DE (1) DE602004012535T2 (en)
EA (1) EA007545B1 (en)
ES (1) ES2303941T3 (en)
FI (1) FI115120B (en)
TW (1) TW200500154A (en)
WO (1) WO2004078372A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117733480A (en) * 2023-12-08 2024-03-22 洛阳汇晶新材料科技有限公司 430 seamless thin-wall tubule extrusion method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU67959A1 (en) * 1973-07-06 1975-04-11
US4445350A (en) * 1980-11-29 1984-05-01 Kabushiki Kaisha Kobe Seiko Sho Extrusion method using hot lubricant
FR2623110B1 (en) * 1987-11-18 1990-12-28 Virax Sa PROCESS FOR MECHANICAL SCRAPING OF THE INTERNAL WALL OF THE END OF ROUND TUBES OR CURVILINE SECTION AND BRUSHING TOOL FOR IMPLEMENTING THIS PROCESS
DE4334536A1 (en) * 1993-10-09 1995-04-13 Kabelmetal Ag Process for the production of seamless drawn semi-hard / hard installation pipes
JP3610560B2 (en) * 1995-02-06 2005-01-12 住友電気工業株式会社 Waveguide manufacturing method and waveguide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004078372A1 *

Also Published As

Publication number Publication date
DE602004012535D1 (en) 2008-04-30
TW200500154A (en) 2005-01-01
EA007545B1 (en) 2006-10-27
FI115120B (en) 2005-03-15
FI20030344A0 (en) 2003-03-07
ES2303941T3 (en) 2008-09-01
EA200501239A1 (en) 2006-02-24
EP1601472B1 (en) 2008-03-19
FI20030344L (en) 2004-09-08
DE602004012535T2 (en) 2009-05-07
ATE389466T1 (en) 2008-04-15
WO2004078372A1 (en) 2004-09-16

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