EP1121991B1 - Verfahren zur Herstellung von Metallrohren - Google Patents

Verfahren zur Herstellung von Metallrohren Download PDF

Info

Publication number: EP1121991B1
Authority: EP; European Patent Office
Prior art keywords: rollers; forming; metal band; metal; form rollers
Prior art date: 2000-02-01
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.): Expired - Lifetime

Application number

EP00400311A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP1121991A1 (de

Inventor

Friedrich Dipl.-Ing. Harten

Michael Meyer

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.)

Nexans SA

Original Assignee

Nexans SA

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.)

2000-02-01

Filing date

2000-02-01

Publication date

2002-12-11

2000-02-01 Priority to DE50000912T priority Critical patent/DE50000912D1/de

2000-02-01 Priority to EP00400311A priority patent/EP1121991B1/de

2000-02-01 Priority to ES00400311T priority patent/ES2184682T3/es

2000-02-01 Priority to DK00400311T priority patent/DK1121991T3/da

2000-02-01 Priority to AT00400311T priority patent/ATE229386T1/de

2000-02-01 Application filed by Nexans SA filed Critical Nexans SA

2001-01-30 Priority to US09/771,635 priority patent/US6513699B2/en

2001-01-31 Priority to JP2001024554A priority patent/JP2001246421A/ja

2001-08-08 Publication of EP1121991A1 publication Critical patent/EP1121991A1/de

2002-12-11 Application granted granted Critical

2002-12-11 Publication of EP1121991B1 publication Critical patent/EP1121991B1/de

2020-02-01 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

- 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
- 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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
- B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like

Definitions

the invention relates to a method and an apparatus for producing Metal pipes according to the preamble of claim 1 and claim 3, (see e.g. US-A-3,260,099).
the strip edges to be welded are free of grease and oxide and on the other others the strip edges are guided cleanly and exactly during the welding process butt against each other at the same height.
the band edges of the trimmed degreased metal strip immediately before forming into a slotted tube.
Forming tools made of steel have proven themselves for metal strips made of steel and copper, which consist of pairs of form rollers or form rollers.
the metal band will be there gradually deformed into a slotted tube between the form rollers or form rollers.
the disadvantage of this known device is the fact that by attacking the Brushing device, the surface of the form rollers or form rollers additionally stressed is removed and not only the cold-welded particles. This causes an additional one Wear on the form rollers or form rollers.
the present invention is therefore based on the object, the described To avoid disadvantages and to provide a method and an apparatus in which cold welding of the tools is prevented from the outset.
the main advantage of the invention is that the extremely high Hardness of the surface of the form rollers or form rollers the coefficient of friction between the belt and the form roller or the form roller is significantly reduced.
the attainable hardness is five times higher than the hardness of conventional titanium nitride layers. It will achieved a coefficient of friction of well below 0.1.
FIGS. 1 to 3 Exemplary embodiments explained in more detail.
TOG welding arc welding under protective gas
the first three form stages 4, 5 and 6 each consist of an upper form roller 4a, 5a and 6a and a lower form roller 4b, 5b and 6b, between which the Aluminum strip 1 is gradually converted into the tube shape.
a vertical one Pair of form rollers 7 and a self-contained form ring 8 complete the Molding device 2.
rollers 4a, 4b, 5a, 5b, 6a and 6b are suitably made of steel.
the Rollers 4a, 5a, 5b, 6a and 6b can, however, be made of plastic, e.g. B. polyethylene, polyamide etc. exist.
the roller 4b must always be made of steel, since this is the strongest is claimed.
the shaping rollers 4a, 4b, 5a, 5b, 6a and 6b have if they are made of steel, a surface hardness of more than 100 GPa. This extremely high hardness is due to the incorporation of carbon atoms in the crystal lattice of the steel of the forming roller. The process developed for this is published in the magazine " MO metal surface "Carl Hanser Verlag 50th year 4/96 released.
FIG. 2 shows a view of the first molding stage 4 with the molding rollers 4a and 4b, between which the edge areas of the unspecified metal strip are extreme be strongly deformed.
the hardened surface of the form rollers 4a and 4b is shown in dashed lines and designated 9.
FIG. 3 shows a section through a Turkish head that consists of the four rollers 11 a consists.
the surface of the rollers also has a hardness of more than 100 GPa.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Bending Of Plates, Rods, And Pipes (AREA)
Butt Welding And Welding Of Specific Article (AREA)
Forging (AREA)
Metal Extraction Processes (AREA)

EP00400311A 2000-02-01 2000-02-01 Verfahren zur Herstellung von Metallrohren Expired - Lifetime EP1121991B1 (de)

Priority Applications (7)

Application Number	Priority Date	Filing Date	Title
EP00400311A EP1121991B1 (de)	2000-02-01	2000-02-01	Verfahren zur Herstellung von Metallrohren
ES00400311T ES2184682T3 (es)	2000-02-01	2000-02-01	Metodo para fabricar tubos de metal.
DK00400311T DK1121991T3 (da)	2000-02-01	2000-02-01	Fremgangsmåde til fremstilling af metalrør
AT00400311T ATE229386T1 (de)	2000-02-01	2000-02-01	Verfahren zur herstellung von metallrohren
DE50000912T DE50000912D1 (de)	2000-02-01	2000-02-01	Verfahren zur Herstellung von Metallrohren
US09/771,635 US6513699B2 (en)	2000-02-01	2001-01-30	Process for the production of metal pipes
JP2001024554A JP2001246421A (ja)	2000-02-01	2001-01-31	金属管製造方法

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP00400311A EP1121991B1 (de)	2000-02-01	2000-02-01	Verfahren zur Herstellung von Metallrohren

Publications (2)

Publication Number	Publication Date
EP1121991A1 EP1121991A1 (de)	2001-08-08
EP1121991B1 true EP1121991B1 (de)	2002-12-11

Family

ID=8173532

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP00400311A Expired - Lifetime EP1121991B1 (de)	2000-02-01	2000-02-01	Verfahren zur Herstellung von Metallrohren

Country Status (7)

Country	Link
US (1)	US6513699B2 (da)
EP (1)	EP1121991B1 (da)
JP (1)	JP2001246421A (da)
AT (1)	ATE229386T1 (da)
DE (1)	DE50000912D1 (da)
DK (1)	DK1121991T3 (da)
ES (1)	ES2184682T3 (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US20040250404A1 (en) *	2003-01-14	2004-12-16	Cripsey Timothy J.	Process for press forming metal tubes
CN108895213A (zh) *	2018-05-30	2018-11-27	浙江康盛股份有限公司	一种超薄壁管及其加工方法
EP3797890B1 (de)	2019-09-30	2024-03-27	Nexans	Verfahren zur herstellung dünnwandiger hohlprofile kleiner durchmesser aus ne-metallen
EP3797891B1 (de) *	2019-09-30	2023-08-02	Nexans	Verfahren zur kontinuierlichen herstellung abschnittsweise gewellter, dünnwandiger hohlprofile kleiner durchmesser aus ne-metallen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3260099A (en) *	1964-07-28	1966-07-12	Frank E Elge	Tube forming machine
US3349832A (en) *	1964-07-31	1967-10-31	Simplex Wire & Cable Co	Method of forming sheathed conductor
US3368379A (en) *	1964-09-17	1968-02-13	Simplex Wire & Cable Co	Tube closing device
AT327140B (de) *	1974-05-20	1976-01-12	Plansee Metallwerk	Mit hartmetall bestuckte oder zur ganze aus hartmetall bestehende walzrollen sowie verfahren zu ihrer herstellung
JP2842720B2 (ja) *	1991-11-29	1999-01-06	京セラ株式会社	伸線用ダイスおよびその製造方法
JP3382968B2 (ja) *	1992-06-12	2003-03-04	三菱アルミニウム株式会社	管製造用フォーミングロール、管製造方法及び電縫管
JPH0890092A (ja) *	1994-09-19	1996-04-09	Nanotetsuku Kk	無潤滑絞り金型および無潤滑絞り加工方法
JPH1044140A (ja) *	1996-07-31	1998-02-17	Kyocera Corp	加工用ローラー及びワイヤーソー

2000
- 2000-02-01 EP EP00400311A patent/EP1121991B1/de not_active Expired - Lifetime
- 2000-02-01 DE DE50000912T patent/DE50000912D1/de not_active Expired - Lifetime
- 2000-02-01 AT AT00400311T patent/ATE229386T1/de active
- 2000-02-01 ES ES00400311T patent/ES2184682T3/es not_active Expired - Lifetime
- 2000-02-01 DK DK00400311T patent/DK1121991T3/da active
2001
- 2001-01-30 US US09/771,635 patent/US6513699B2/en not_active Expired - Fee Related
- 2001-01-31 JP JP2001024554A patent/JP2001246421A/ja active Pending

Also Published As

Publication number	Publication date
ES2184682T3 (es)	2003-04-16
US6513699B2 (en)	2003-02-04
DK1121991T3 (da)	2003-03-31
EP1121991A1 (de)	2001-08-08
US20010042773A1 (en)	2001-11-22
DE50000912D1 (de)	2003-01-23
ATE229386T1 (de)	2002-12-15
JP2001246421A (ja)	2001-09-11

Legal Events

Date	Code	Title	Description
2001-06-22	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
2001-08-08	17P	Request for examination filed	Effective date: 20000927
2001-08-08	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
2001-08-08	AX	Request for extension of the european patent	Free format text: AL;LT;LV;MK;RO;SI
2002-03-27	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
2002-05-02	AKX	Designation fees paid	Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
2002-05-15	17Q	First examination report despatched	Effective date: 20020405
2002-07-03	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
2002-07-03	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
2002-09-17	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
2002-10-25	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
2002-12-11	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
2002-12-11	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20021211 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20021211
2002-12-11	REF	Corresponds to:	Ref document number: 229386 Country of ref document: AT Date of ref document: 20021215 Kind code of ref document: T
2002-12-11	REG	Reference to a national code	Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH
2002-12-13	REG	Reference to a national code	Ref country code: CH Ref legal event code: EP
2002-12-31	GBT	Gb: translation of ep patent filed (gb section 77(6)(a)/1977)	Effective date: 20021211
2003-01-22	REG	Reference to a national code	Ref country code: IE Ref legal event code: FG4D Free format text: GERMAN
2003-01-23	REF	Corresponds to:	Ref document number: 50000912 Country of ref document: DE Date of ref document: 20030123
2003-02-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030201 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030201
2003-02-14	REG	Reference to a national code	Ref country code: CH Ref legal event code: NV Representative=s name: CRONIN INTELLECTUAL PROPERTY
2003-02-28	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030228
2003-03-11	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030311
2003-03-31	REG	Reference to a national code	Ref country code: DK Ref legal event code: T3
2003-04-01	REG	Reference to a national code	Ref country code: SE Ref legal event code: TRGR
2003-04-16	REG	Reference to a national code	Ref country code: ES Ref legal event code: FG2A Ref document number: 2184682 Country of ref document: ES Kind code of ref document: T3
2003-07-25	ET	Fr: translation filed
2003-08-20	REG	Reference to a national code	Ref country code: IE Ref legal event code: FD4D Ref document number: 1121991E Country of ref document: IE
2003-10-17	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
2003-10-17	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
2003-12-03	26N	No opposition filed	Effective date: 20030912
2007-04-13	REG	Reference to a national code	Ref country code: CH Ref legal event code: PCAR Free format text: CRONIN INTELLECTUAL PROPERTY;CHEMIN DE PRECOSSY 31;1260 NYON (CH)
2008-04-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DK Payment date: 20080215 Year of fee payment: 9 Ref country code: ES Payment date: 20080228 Year of fee payment: 9
2008-05-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 20080220 Year of fee payment: 9 Ref country code: NL Payment date: 20080214 Year of fee payment: 9 Ref country code: SE Payment date: 20080214 Year of fee payment: 9
2008-07-31	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 20080214 Year of fee payment: 9
2008-08-29	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: BE Payment date: 20080327 Year of fee payment: 9
2009-08-31	BERE	Be: lapsed	Owner name: NEXANS Effective date*: 20090228
2009-10-13	EUG	Se: european patent has lapsed
2009-10-19	REG	Reference to a national code	Ref country code: DK Ref legal event code: EBP
2009-10-28	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 20090201
2009-11-02	NLV4	Nl: lapsed or anulled due to non-payment of the annual fee	Effective date: 20090901
2009-11-27	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST Effective date: 20091030
2009-11-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090901
2010-02-26	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090228
2010-04-29	REG	Reference to a national code	Ref country code: ES Ref legal event code: FD2A Effective date: 20090202
2010-04-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090302 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090201
2010-07-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090202 Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090831
2011-05-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090202
2014-04-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FI Payment date: 20140212 Year of fee payment: 15
2014-05-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: IT Payment date: 20140225 Year of fee payment: 15
2015-10-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150201
2015-12-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150201
2016-04-29	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: CH Payment date: 20160217 Year of fee payment: 17 Ref country code: DE Payment date: 20160218 Year of fee payment: 17
2016-05-31	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: AT Payment date: 20160218 Year of fee payment: 17
2017-09-01	REG	Reference to a national code	Ref country code: DE Ref legal event code: R119 Ref document number: 50000912 Country of ref document: DE
2017-09-29	REG	Reference to a national code	Ref country code: CH Ref legal event code: PL
2017-10-15	REG	Reference to a national code	Ref country code: AT Ref legal event code: MM01 Ref document number: 229386 Country of ref document: AT Kind code of ref document: T Effective date: 20170201
2017-10-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170228 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170228 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170201
2018-01-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170901

Publication	Publication Date	Title
EP1479842B1 (de)	2008-11-19	Hohlprofil
DE19614656A1 (de)	1997-10-16	Verfahren zum Erhöhen der Wandungsstärke bei Hohlprofilen
EP0096087A1 (de)	1983-12-21	Verfahren und Hohlprofil zum Verbinden mit anderen Profilen durch Aufmuffen, Aufbördeln, o. dgl.
EP0193589A1 (de)	1986-09-10	Vorrichtung und Verfahren zum Herstellen einer Schlauchpresshülse.
EP2919937A2 (de)	2015-09-23	Verfahren zur bestimmung der freiflächenkontur eines wälzschälwerkzeuges, wälzschälwerkzeug und dessen verwendung
DE2607755C2 (da)	1989-06-29
EP0445904B1 (de)	1994-09-28	Verfahren zur Herstellung eines metallischen, dickwandigen Hochdruckrohres
DE7935982U1 (de)	1980-06-04	Wälzlagerkäfig
EP0112437A1 (de)	1984-07-04	Werkzeug für eine genaue Bearbeitung und eine Feinbearbeitung von zylindrischen Profilöffnungen
DE4117814A1 (de)	1992-12-03	Werkzeug fuer feinstbearbeitung
EP1121991A1 (de)	2001-08-08	Verfahren zur Herstellung von Metallrohren
DE3019592C2 (de)	1983-11-03	Vorrichtung zum Bearbeiten von Stahlrohren
EP0636432A1 (de)	1995-02-01	Verfahren zur Herstellung eines schraubenlinien- oder ringförmig gewellten Metallrohres
DE19649992C2 (de)	1999-03-04	Zangenartiges Werkzeug
DE19851492A1 (de)	2000-05-11	Verfahren zum Herstellen eines Bauteils mittels Innenhochdruck-Umformen
DE3910192A1 (de)	1990-09-27	Verfahren zur herstellung von stahlflaschen
DE102014115426B4 (de)	2018-07-26	Vorrichtung und Verfahren zum kontinuierlichen voranschreitenden Umformen von Metallbändern zu einem Profil mit längsveränderlichem Querschnitt
DE1075082B (de)	1960-02-11	Vorrichtung zur Verformung der inneren Oberfläche eines rohrförmigen Werkstückes
EP2335875A1 (de)	2011-06-22	Bandschleifmaschine zum Bearbeiten gekrümmter Oberflächen
DE647719C (de)	1937-07-13	Walzenkalibrierung
DE9403594U1 (de)	1994-06-23	Einrichtung zur Herstellung von Metallrohren
DE2758138C2 (de)	1979-11-15	Verfahren zur Herstellung von Präzisionsstahlrohren aus einzeln abgelängtem Blechmaterial
DE102018005356B4 (de)	2026-03-19	Verfahren und Herstellungsvorrichtung zur Herstellung eines Rohrs
EP0892689B1 (de)	2002-08-28	Verfahren zum erhöhen der wandungsstärke bei hohlprofilen
DE3906565C2 (de)	1998-04-16	Verfahren und Vorrichtung zur Herstellung eines bogenförmigen Bauelements