EP0589104A1 - Verfahren zum Herstellen eines Rohrs - Google Patents
Verfahren zum Herstellen eines Rohrs Download PDFInfo
- Publication number
- EP0589104A1 EP0589104A1 EP92308616A EP92308616A EP0589104A1 EP 0589104 A1 EP0589104 A1 EP 0589104A1 EP 92308616 A EP92308616 A EP 92308616A EP 92308616 A EP92308616 A EP 92308616A EP 0589104 A1 EP0589104 A1 EP 0589104A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubing
- strip
- mild steel
- embossed
- contoured
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims abstract description 5
- 238000004049 embossing Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 238000003466 welding Methods 0.000 description 9
- 239000011261 inert gas Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000009497 press forging Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/083—Supply, or operations combined with supply, of strip material
-
- 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
Definitions
- This invention relates to tubing, particularly to steel tubing having a contoured exterior surface, and to a method of making such tubing.
- Steel tubing is conventionally made in a continuous process in which cold flat steel strip of the desired width is passed through a series of rolls which shape the strip from flat to circular transverse cross-sectional form.
- the so-shaped form, with the longitudinal edges of the réellewhile strip now abutting, is passed to a welding station where the abutting edges are welded together to form closed tubing of the desired diameter.
- the tubing is then passed through finishing stations where external and, if desired, internal flash is removed, the tubing is sized, tested for soundness of weld and then cut to desired length.
- emboss a pattern onto the flat steel strip prior to its formation into tubing it has been proposed to manufacture embossed stainless steel tubing by this means, it has not hitherto proved possible to form satisfactorily mild steel tubing with a contoured external surface.
- Stainless steel is normally welded into tubular form by so-called tungsten inert gas welding or, alternatively, by so-called metal inert gas welding. Both techniques involve passing the to-be-welded tubing through a work station where it is subjected to an electric arc which melts the steel in the region of the desired joint. A metal filler wire is directed into the joint region in the so-called metal inert gas welding process. This welding technique restricts the throughput of the forming process to the order of about five metres per minute.
- Mild steel is welded into tubular form by heating the abutting edges of the tubing by high frequency induction heating means and then press-forging the abutting edges together to form the joint. This enables the throughput of the process to be of the order of 400 metres per minute.
- the present invention provides a method of making mild steel tubing having a contoured pattern on its exterior surface in which flat mild steel strip of width corresponding to the outside diameter of the desired tubing is passed through embossing rolls which emboss a contoured pattern on at least one surface of the strip, the embossed strip is passed through shaping rolls which shape the strip to tubular form with the embossed pattern outermost, the opposed longitudinal edges of the tubular form are subjected to high frequency induction heating and the heated edges are press-forged together to form a longitudinally-extending welded joint.
- the tube is then passed to a finishing station where any metal "flash” from the welding process is removed or “scarfed” from the outside (and inside, if so desired) of the still hot tubing.
- the tubing can then be cooled, sized and cut to desired length.
- the invention provides a mild steel tubing having a contoured external surface and a longitudinal welded joint.
- the joint may be discontinuous, i.e. stitch-welded, along the entire length or randomly dispersed along the length between continuous welded lengths.
- milled steel in the present invention is meant to embrace all steels falling within the cold-rolled and hot-rolled definitions of Euro-Norms 111-77 and 130-77.
- the pattern that is embossed onto the flat strip does not extend across the entire width of the strip but is applied centrally leaving a narrow unembossed margin along each longitudinal edge of the strip.
- the invention also provides steel tubing having a contoured pattern over its external surface except for a non-contoured portion extending along and bordering the weldline.
- the non-embossed portion can be positioned out of sight at the rear of the tubing.
- the contoured pattern of the tubing can have a dual-purpose. It may be primarily decorative or primarily to provide frictional, e.g. hand-gripping, properties but in many applications both functions will be of value.
- tubing of the invention are manifold and the following list is by no means exhaustive.
- Handrails of many types e.g. for buses, trains, stairways, ferries and in theatres.
- Any desired patterns may be applied to the surface of the strip subject only to the embossing capabilities of the rolls on mild steel.
- flat mild steel strip 10 has had an embossed pattern 11 applied to its central region leaving an unembossed margin 12 along the longitudinal edges of the strip.
- the embossed strip of Figure 1 is shown passing through pairs of forming rolls 13 and 14 at the stage of the tubing forming process where it is in semi-cylindrical form 15.
- the embossed pattern is not shown in this view.
- the tubing being formed is passing from rolls 13 to 14 and undergoing a conventional reduction in diameter.
- the semi-cylindrical form from the stage of Figure 2 is shown being formed into the desired tubular shape.
- the longitudinal edges 16 and 17 of the semi-cylindrical form are brought gradually closer together as they pass through the high frequency induction heating station 18.
- Opposed longitudinal edges 16 and 17 are then welded together while hot between forging rolls 19 to form the desired tubular product with welded joint line 20.
- Tubing 21 has the embossed pattern 11 on its exterior surface with an unembossed margin 12 on each side of weld line 20.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19920308616 EP0589104B1 (de) | 1992-09-22 | 1992-09-22 | Verfahren zum Herstellen eines Rohrs |
| DE1992623320 DE69223320T2 (de) | 1992-09-22 | 1992-09-22 | Verfahren zum Herstellen eines Rohrs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19920308616 EP0589104B1 (de) | 1992-09-22 | 1992-09-22 | Verfahren zum Herstellen eines Rohrs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0589104A1 true EP0589104A1 (de) | 1994-03-30 |
| EP0589104B1 EP0589104B1 (de) | 1997-11-26 |
Family
ID=8211495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920308616 Expired - Lifetime EP0589104B1 (de) | 1992-09-22 | 1992-09-22 | Verfahren zum Herstellen eines Rohrs |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0589104B1 (de) |
| DE (1) | DE69223320T2 (de) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006111917A3 (en) * | 2005-04-19 | 2007-03-08 | Seref Abalioglu | Embossed metal profile |
| EP2105218A1 (de) * | 2008-03-27 | 2009-09-30 | Rachata Leelaprachakul | Geprägtes Rohr |
| ITMI20110540A1 (it) * | 2011-04-01 | 2012-10-02 | Pierino Olmi | Dispositivo per la marchiatura e la piegatura di una lamiera in un processo di formazione di tubi, metodo per la marchiatura e la formazione di tubi a partire da una lamiera, e tubo realizzato secondo tale metodo |
| WO2013186284A1 (de) * | 2012-06-12 | 2013-12-19 | H + T Handel Und Technik Berwald Gmbh & Co. Kg | Ankerelemente und verfahren zur herstellung von ankerelementen |
| WO2018200880A1 (en) * | 2017-04-26 | 2018-11-01 | Lifetime Products, Inc. | Furniture components with embossed profiles |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH433168A (de) * | 1964-08-26 | 1967-04-15 | Hackethal Draht & Kabelwerk Ag | Verfahren und Einrichtung zur kontinuierlichen Herstellung von Rohren aus dünnen Bändern |
| US3858785A (en) * | 1971-12-30 | 1975-01-07 | Olin Corp | Apparatus for making heat exchanger tube |
| US3918626A (en) * | 1971-12-30 | 1975-11-11 | Olin Corp | Method of fabricating patterned tubing from metallic strip |
| DE3326010A1 (de) * | 1983-07-15 | 1985-01-24 | Mannesmann AG, 4000 Düsseldorf | Verfahren und vorrichtung zur herstellung von geschweissten waermerohren |
| EP0164233A2 (de) * | 1984-06-01 | 1985-12-11 | ALLIED TUBE & CONDUIT CORPORATION | Vorrichtung zur Herstellung eines gerippten Rohres |
-
1992
- 1992-09-22 EP EP19920308616 patent/EP0589104B1/de not_active Expired - Lifetime
- 1992-09-22 DE DE1992623320 patent/DE69223320T2/de not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH433168A (de) * | 1964-08-26 | 1967-04-15 | Hackethal Draht & Kabelwerk Ag | Verfahren und Einrichtung zur kontinuierlichen Herstellung von Rohren aus dünnen Bändern |
| US3858785A (en) * | 1971-12-30 | 1975-01-07 | Olin Corp | Apparatus for making heat exchanger tube |
| US3918626A (en) * | 1971-12-30 | 1975-11-11 | Olin Corp | Method of fabricating patterned tubing from metallic strip |
| DE3326010A1 (de) * | 1983-07-15 | 1985-01-24 | Mannesmann AG, 4000 Düsseldorf | Verfahren und vorrichtung zur herstellung von geschweissten waermerohren |
| EP0164233A2 (de) * | 1984-06-01 | 1985-12-11 | ALLIED TUBE & CONDUIT CORPORATION | Vorrichtung zur Herstellung eines gerippten Rohres |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 7, no. 44 (M-195)22 February 1983 & JP-A-57 193 226 ( SUMITOMO KINZOKUKOGYO ) 27 November 1982 * |
| PATENT ABSTRACTS OF JAPAN vol. 9, no. 191 (M-402)(1914) 7 August 1985 & JP-A-60 56 418 ( SANOU KOGYO K.K. ) 2 April 1985 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006111917A3 (en) * | 2005-04-19 | 2007-03-08 | Seref Abalioglu | Embossed metal profile |
| EP2105218A1 (de) * | 2008-03-27 | 2009-09-30 | Rachata Leelaprachakul | Geprägtes Rohr |
| ITMI20110540A1 (it) * | 2011-04-01 | 2012-10-02 | Pierino Olmi | Dispositivo per la marchiatura e la piegatura di una lamiera in un processo di formazione di tubi, metodo per la marchiatura e la formazione di tubi a partire da una lamiera, e tubo realizzato secondo tale metodo |
| WO2013186284A1 (de) * | 2012-06-12 | 2013-12-19 | H + T Handel Und Technik Berwald Gmbh & Co. Kg | Ankerelemente und verfahren zur herstellung von ankerelementen |
| WO2018200880A1 (en) * | 2017-04-26 | 2018-11-01 | Lifetime Products, Inc. | Furniture components with embossed profiles |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69223320D1 (de) | 1998-01-08 |
| DE69223320T2 (de) | 1998-04-09 |
| EP0589104B1 (de) | 1997-11-26 |
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