DK167563B1 - PROCEDURE FOR THE MANUFACTURE OF THIN-WEIGHTED PIPES - Google Patents
PROCEDURE FOR THE MANUFACTURE OF THIN-WEIGHTED PIPES Download PDFInfo
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- DK167563B1 DK167563B1 DK161388A DK161388A DK167563B1 DK 167563 B1 DK167563 B1 DK 167563B1 DK 161388 A DK161388 A DK 161388A DK 161388 A DK161388 A DK 161388A DK 167563 B1 DK167563 B1 DK 167563B1
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- DK
- Denmark
- Prior art keywords
- longitudinal edges
- longitudinal
- welding
- strip
- zinc
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Saccharide Compounds (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
i DK 167563 B1in DK 167563 B1
Opfindelsen angår en fremgangsmåde til fremstilling af forholdsvis tyndvæggede rør med ved hjælp af modstandssvejsning fremstillet længdesøm, navnlig nedløbsrør, med en diameter på fra 50 til 200 mm og en vægtykkelse på fra 0,50 5 til 1,50 mm af et bånd, fortrinsvis et endeløst bånd, af zink eller zinklegeringer, fortrinsvis af zink-kobber-titan-legeringer, ved valseprofilering af båndet til et rundet profil forsynet med en til begge sider for symmetriplanet forløbende, langsgående slids, idet de den langsgående slids 10 begrænsende, langsgående kanter i en forholdsvis kort zone opvarmes til svejsetemperatur, sammenføres under dannelse af en V-formet spalte i svejsepunktet og sammensvejses stumpt med hinanden ved hjælp af stukning.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing relatively thin-walled tubes having a longitudinal seam made by resistance welding, in particular downpipes, having a diameter of from 50 to 200 mm and a wall thickness of from 0.50 to 1.50 mm of a band, preferably a endless strip, of zinc or zinc alloys, preferably of zinc-copper-titanium alloys, by rolling profiling of the strip to a rounded profile provided with a longitudinal slit extending to both sides of the plane of symmetry, with the longitudinal edges limiting the longitudinal slit 10 a relatively short zone is heated to welding temperature, joined together to form a V-shaped slit at the welding point and bluntly welded together by means of plunging.
I DE patentskrift nr. 2 607 970 er beskrevet en frem-15 gangsmåde og et apparat til fremstilling af tyndvæggede rør af ikke-jernmetal ler med indlagt lod. Herved rundes der profiler af blikstrimler af passende størrelse, hvis langsgående kanter overlapper hinanden under dannelse af en fuge i området for den længdesøm, der skal fremstilles ved lod-20 ning. Efter indlægning af et loddebånd i fugen trykkes de overlappende langsgående kanter af det rundede profil imod hinanden, opvarmes ved varmetilførsel, og rørets længdesøm-forbindelse loddes. Ifølge DIN 18641 kan sådanne overlapningssøm også fremstilles ved svejsning. Det må imidlertid 25 betragtes som en ulempe, at både den rørlængde, der kan fremstilles, og den maksimalt opnåelige lodde- eller svejsehastighed er begrænset til 8 m/min. Desuden påvirkes den æstetiske virkning af røret ikke ubetydeligt af overlapningssømmen.DE Patent Specification No. 2 607 970 discloses a method and apparatus for producing thin-walled non-ferrous metal clay tubes with inlaid solder. Hereby profiles of tin strips of a suitable size are rounded, whose longitudinal edges overlap to form a joint in the region of the longitudinal seam to be made by soldering. After inserting a solder band into the joint, the overlapping longitudinal edges of the rounded profile are pressed against each other, heated by heat supply, and the longitudinal seam connection of the pipe is soldered. According to DIN 18641, such overlap stitches can also be made by welding. However, it must be considered a disadvantage that both the pipe length that can be manufactured and the maximum achievable soldering or welding speed are limited to 8 m / min. In addition, the aesthetic effect of the tube is not negatively affected by the overlap seam.
30 I US patentskrift nr. 2 817 364 er beskrevet en frem gangsmåde til fremstilling af forholdsvis tyndvæggede rør, fortrinsvis aluminiumrør, med svejst længdesøm ved hjælp af højfrekvensinduktionspressesvejsning. Ved fremgangsmåden affases et metalbånd ved sine langsgående kanter og afrundes 35 derpå til et rørformet tværsnit, hvorpå de langsgående kanter i en kort zone opvarmes til svejsetemperatur og sammenføres 2 under dannelse af en V-formet spalte i svejsepunktet og stumpsvej ses.30 U.S. Patent No. 2,817,364 discloses a method of producing relatively thin-walled tubes, preferably aluminum tubes, with welded longitudinal seams by high frequency induction press welding. In the method, a metal strip is chamfered at its longitudinal edges and then rounded to a tubular cross-section, whereupon the longitudinal edges of a short zone are heated to welding temperature and joined 2 to form a V-shaped gap at the welding point and blunt weld is seen.
Formålet for den foreliggende opfindelse er med udgangspunkt i den indledningsvis beskrevne fremgangsmåde en 5 kontinuerlig automatisk produktion af længdesømsvej ste rør af enhver ønsket længde, som tilfredsstiller de i dag på byggeområdet sædvanlige æstetiske krav.The object of the present invention is, on the basis of the method described initially, a continuous automatic production of longitudinally welded tubes of any desired length which satisfies the usual aesthetic requirements today in the field of construction.
Dette formål opnås ved, at de før valseprofileringen med henblik på fremstilling af deres parallelitet spåntagende 10 bearbejdede langsgående kanter af båndet under dannelse af den langsgående slids anbringes parallelt overfor hinanden og i en zone med 0,2 til 1,5 mm bredde samt 0,5 til 2,5 mm længde opvarmes til en under smeltetemperaturen liggende svejsetemperatur og sammensvejses med hinanden i plastisk 15 tilstand.This object is achieved by placing the longitudinally machined longitudinal edges of the strip prior to the roll profiling to form their parallelism, forming the longitudinal slot parallel to each other and in a zone of 0.2 to 1.5 mm width and 0, 5 to 2.5 mm in length is heated to a welding temperature below the melting temperature and welded together in plastic state.
For at opnå en uklanderlig svejsesøm er det nødvendigt at bearbejde de langsgående kanter af båndet til parallelt forløb med hinanden ved spåntagning før valseprofileringen, så at de ved rundet profil uden vanskeligheder kan anbringes 20 parallelt overfor hinanden i stuksvej seområdet. Ved spåntagningen fjernes også oxidhinden. Ved disse foranstaltninger undgås uregelmæssig varmetilførsel, energitab, ensidig gratdannelse, stærk punktvis overhedning med opsmeltning af båndmaterialet, kantforsætning samt en overlapning af de 25 langsgående kanter.In order to obtain an impeccable weld seam, it is necessary to work the longitudinal edges of the strip in parallel with one another by cutting before the roll profiling, so that, with a rounded profile, they can be placed parallel to each other in the section weld area without difficulty. When cutting, the oxide membrane is also removed. By these measures, irregular heat supply, energy loss, unilateral grating, strong point-overheating with melting of the strip material, edge offset and an overlap of the 25 longitudinal edges are avoided.
Ved båndtykkelser på 1 mm og mere foreslås det spåntagende at bearbejde endefladerne af de langsgående kanter af båndet under en vinkel på fra større end 0 til 10“, da det så sikres, at endefladerne af de langsgående kanter kan 30 anbringes parallelt overfor hinanden i stuksvej seområdet.At strip thicknesses of 1 mm and more, it is proposed to machinate the end faces of the longitudinal edges of the tape at an angle of greater than 0 to 10 ", since it is then ensured that the end faces of the longitudinal edges can be arranged parallel to each other in sectional paths. roller area.
Indenfor rammerne for den foretrukne udførelsesform for fremgangsmåden ifølge opfindelsen opvarmes de langsgående kanter af det rundede profil i den forholdsvis korte zone til mindst 350°C.Within the scope of the preferred embodiment of the method according to the invention, the longitudinal edges of the rounded profile in the relatively short zone are heated to at least 350 ° C.
35 Vinklen af den V-formede længdespalte, under hvilken de langsgående kanter af det forrundede profil føres sammen 3 i svejsepunktet, er begrænset af båndets deformationsegenskaber. De langsgående kanter bliver før svejsningen praktisk talt tvunget fra hældning ind i det vandrette plan og står således under stærk trækbelastning, som imidlertid ikke må 5 overskride det elastiske område for at undgå knækdannelser. Det er derfor hensigtsmæssigt, at den V-formede længdespalte har en vinkel på fra 3 til 10°, fortrinsvis 5 til 7e.The angle of the V-shaped longitudinal slot below which the longitudinal edges of the rounded profile are joined together 3 at the welding point is limited by the deformation properties of the belt. The longitudinal edges, before welding, are practically forced from inclination into the horizontal plane and thus are subject to strong tensile load, which, however, must not exceed the elastic area to avoid cracking. Therefore, it is convenient that the V-shaped longitudinal gap has an angle of from 3 to 10 °, preferably 5 to 7e.
Til fremstilling af svejsesømmen sammentrykkes de i en kort zone i det højeste til smeltetemperatur opvarmede 10 langsgående kanter af det rundede profil i svejsepunktet ved stukning og sammensvejses med hinanden, idet stuknings-strækningen andrager 0,5 til 3 gange tykkelsen af båndet. Ved en opvarmning af den forholdsvis korte zone af de langsgående kanter ud over smeltepunktet for båndmaterialet, kan 15 det komme til smeltning i zonen og dermed til udformning af en svejsesøm, hvis kvalitet ikke svarer til de stillede mekanisk-teknologiske krav.To produce the weld seam, the 10 longitudinal edges of the rounded profile at the welding point are compressed in a short zone at the highest to melt temperature at the welding point and are welded to each other, the stretching stretch being 0.5 to 3 times the thickness of the strip. By heating the relatively short zone of the longitudinal edges beyond the melting point of the strip material, it may result in melting in the zone and thus to form a weld seam whose quality does not meet the mechanical-technological requirements.
Til fremstilling af svejsesømmen er navnlig højfre-kvensinduktionspressesvej sning egnet.For the manufacture of the welding seam, in particular, high frequency induction press welding is suitable.
20 En høj kvalitet af svejsesømmen kan opnås, når høj frekvenseffekten i opvarmningszonen andrager 5 til 150 kVA, fortrinsvis 5 til 100 kVA.A high quality of the weld seam can be obtained when the high frequency power in the heating zone is 5 to 150 kVA, preferably 5 to 100 kVA.
Med henblik på bearbejdning af båndet efter fremgangsmåden ifølge opfindelsen i ét gennemløb er i linie efter 25 hinanden anbragt en spåntagningsindretning til spåntagende parallelbearbejdning af de langsgående kanter, et antal vandrette bøjevalsepar, mellem hvilke båndet formes til det rundede profil med en til begge sider for symmetriplanet forløbende, langsgående slids, mindst ét vandret førings-30 valsepar, ved hjælp af hvilket de langsgående kanter af det rundede profil anbringes parallelt, og den midterste skråkant af båndet forbliver i symmetriplanet under deformationen, en spoleinduktor til opvarmning af de langsgående kanter af det rundede profil i opvarmningszonen, mindst ét lodret 35 stuktrykvalsepar, med hvilket de langsgående kanter af det rundede profil sammenføres hen til svejsepunktet og anbringes 4 parallelt overfor hinanden og i plastisk tilstand forbindes med hinanden ved hjælp af kontinuerligt stukningstryk, og eventuelt en adskillelsesindretning til afskæring af rørafsnit af en fremstillet rørstreng.For machining the strip according to the method according to the invention in one pass, in line with one another, a cutting device is arranged for cutting parallel longitudinal edges, a plurality of horizontal bending roll pairs between which the strip is formed into the rounded profile with one for both sides of the plane of symmetry. extending longitudinal slot, at least one horizontal guide roller pair, by means of which the longitudinal edges of the rounded profile are arranged in parallel, and the middle inclined edge of the band remains in the plane of symmetry during the deformation, a coil inductor for heating the longitudinal edges of the rounded profile in the heating zone, at least one vertical 35 plunger roller pair with which the longitudinal edges of the rounded profile are joined to the welding point and placed 4 parallel to each other and in plastic state are connected to each other by means of continuous plunging pressure, and optionally a separation device. for cutting sections of a manufactured pipe string.
5 For at undgå udfjedring af det rundede profil er det hensigtsmæssigt efter hvert bøjevalsepar at anbringe et lodret sidevalsepar.5 In order to avoid springing of the rounded profile, it is appropriate to place a vertical side roll pair after each bending roll pair.
En foretrukken udformning af overvalsen i det føringsvalsepar, der bevirker parallelanbringelse af de langsgående 10 kanter af det rundede profil, består i, at der i det vinkelret på valseaksen stående plan i valsebunden er anbragt en cylinderformet ring, der rager ind i den langsgående slids i det rundede profil, og mod hvis sideflader de langsgående kanter trykkes.A preferred embodiment of the upper roller in the guide roller pair which causes parallel placement of the longitudinal edges of the rounded profile consists in the fact that a cylindrical ring protruding into the longitudinal slot of the roller bottom is arranged in the roller bottom perpendicular to the roller axis. the rounded profile and against whose side surfaces the longitudinal edges are pressed.
15 Den bedste virkningsgrad af spoleinduktoren og dermed en optimal varmeindføring i de langsgående kanter af det rundede profil i området for opvarmningszonen kan opnås, når tykkelsen af ringspalten mellem yderdiameteren af det rundede prodil og inderdiameteren af spoleinduktoren andrager 20 0,5 til 5 mm.The best efficiency of the coil inductor and thus an optimal heat input into the longitudinal edges of the rounded profile in the area of the heating zone can be obtained when the thickness of the ring gap between the outer diameter of the rounded prodil and the inner diameter of the coil inductor is 20 0.5 to 5 mm.
Om nødvendigt kan der i det indre af det rundede profil være anbragt en med spoleinduktoren samvirkende magnetkerne for at opnå en så stærk koncentration som muligt af højfrekvensstrømmen i opvarmningszonen af de langsgående 25 kanter af det rundede profil.If necessary, a magnetic core cooperating with the coil inductor may be arranged in the interior of the rounded profile to obtain as high a concentration as possible of the high frequency current in the heating zone of the longitudinal edges of the rounded profile.
I almindelighed er anbringelse af ét lodret stuktryk-valsepar tilstrækkeligt til sammenføring og stukning af de langsgående kanter af det rundede profil i svejsepunktet. Virkningen bliver imidlertid forbedret, når der i stedet 30 for det lodrette stuktrykvalsepar anvendes tre under en vinkel på 120° i forhold til hinanden eller fire under en vinkel på 90° diagonalt i forhold til hinanden i ét plan anbragte stuktrykvalser.In general, placing one vertical plunger roller pair is sufficient for joining and plunging the longitudinal edges of the rounded profile into the welding point. However, the effect is improved when, instead of the vertical plunger roller pair, three are used at an angle of 120 ° to each other or four at an angle of 90 ° diagonally to one another arranged in one plane in one plane.
Eventuelt kan der efter stuktrykvalserne være anbragt 35 endnu et lodret sidevalsepar for at undgå opspringning af den endnu varme svejsesøm.Optionally, after the plunger rollers, another vertical side roll pair may be provided to avoid bending of the even hot weld seam.
55
Efter svejsningen glattes svejsesømmen hensigtsmæssigt med en afgratningsindretning udvendigt og eventuelt også i det indre af rørstrengen.After welding, the welding seam is conveniently smoothed with a deburring device externally and possibly also in the interior of the pipe string.
Derpå kalibreres rørstrengen ved hjælp af et antal 5 kalibreringsvalsepar.The tube string is then calibrated by a number of 5 calibration roll pairs.
Opfindelsen skal i det følgende beskrives nærmere ud fra en udførelsesf orm, idet der henvises til tegningen, på hvilken fig. 1 viser skematisk og set fra siden et automati-10 seret fremstillingsapparat, fig. 2 skematisk det automatiserede fremstillingsapparat set fra oven, fig. 3 opvarmnings-, stuknings- og svejseområdet set fra oven, og 15 fig. 4 set forfra overvalsen i de vandrette førings valsepar til parallelanbringelse af de langsgående kanter af det rundede profil.BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail from an embodiment, with reference to the drawing, in which: FIG. 1 is a diagrammatic side view of an automated manufacturing apparatus; FIG. 2 is a schematic top view of the automated manufacturing apparatus; FIG. 3 is a plan view of the heating, plunging and welding area, and FIG. 4 is a front view of the roller in the horizontal guide roller pairs for parallel arrangement of the longitudinal edges of the rounded profile.
Et på en dobbeltvinde 1 opviklet 0,65 mm tykt og 297 mm bredt endeløst bånd 2 af en zink-kobber-titanlegering 20 løber via løberuller 3 ind i en svejseindretning 4, i hvilken enden af et i en valseprofileringsstrækning 11 værende bånd 2 sammensvejses med begyndelsen af et påfølgende bånd. I det næste skridt bliver de langsgående kanter 5 af båndet 2 ved hjælp af på et indløbsbord 6 anbragte, ikke nærmere 25 viste høvlestål spåntagende bearbejdet således, at endefladerne af de langsgående kanter 5 forløber parallelt med hinanden for at indstille de til deres svejsning nødvendige plane flader. Båndet 2 indføres så i valseprofileringsstrækningen, der består af seks vandrette bøjevalsepar 7, efter 30 hver af hvilke der er anbragt et lodret sidevalsepar 8, og to efterfølgende føringsvalsepar 9, ved hver af hvilke der i valsebunden i overvalsen er anbragt en cylinderring 10, og i hvilken valseprofileringsstrækning båndet 2 formes til en rundet profil 12 med en opadtil åben, til begge sider for 35 symmetriplanet forløbende, langsgående slids 13. Sidevalse-parrene 8 forhindrer en udfjedring af profilet. Derpå an- 6 bringes de langsgående kanter 5 af det rundede profil 12 i området for* føringsvalseparret 9 parallelt overfor hinanden, idet cylinderringene 10 på de to overvalser rager ind i den langsgående slids 13 i det rundede profil 12. Umiddelbart 5 derpå føres profilet 12 gennem en spoleinduktor 14 og opvarmes derved i et ca. 1 mm bredt og ca. 1,5 mm langt afsnit til en temperatur på 410°C. Derpå løber profilet 12 gennem et lodret stukvalsepar 15, idet de langsgående kanter 5 sammenføres under dannelse af en V-formet slids 16 under en 10 vinkel på 6° i svejsepunktet 17, anbringes parallelt overfor hinanden og sammensvejses ved hjælp af stukning. For at forhindre et opspring af den endnu varme svejsesøm 18 er der umiddelbart efter det lodrette stukvalsepar 15 anbragt et lodret sidevalsepar 19. Derpå kalibreres den svejste rør-15 streng ved hjælp af tre vandrette, et lodret og et yderligere vandret kalibreringsvalsepar 20, idet der mellem det sidste vandrette valsepar 20 og det forudgående lodrette valsepar er anbragt en prøveindretning 21 for svejsesømmen. De med en efter kalibrerings indretningen anbragt adskillelsesindret-20 ning 22, der eksempelvis kan bestå af en flyvende sav, i ønsket længde afskårne rørafsnit aflægges på en udløbsrende 23.A 0.65 mm thick and 297 mm wide endless belt 2 of a zinc-copper-titanium alloy 20 wound on a double winding 1 runs via running rollers 3 into a welding device 4 in which the end of a belt 2 residing in a roll profiling section 11 is welded together. the beginning of a subsequent bond. In the next step, the longitudinal edges 5 of the belt 2 are machined by means of an inlet table 6 not shown closer to 25, so that the end faces of the longitudinal edges 5 extend parallel to each other to adjust the plane necessary for their welding. surfaces. The strip 2 is then inserted into the roll profiling section, which consists of six horizontal bending roll pairs 7, after each of which is arranged a vertical side roll pair 8, and two subsequent guide roll pairs 9, each of which is fitted with a cylinder ring 10 at the bottom of the roll and in which roll profiling stretch the band 2 is formed into a rounded profile 12 with an upwardly open, longitudinal slot 13. For both sides of the plane of symmetry, the lateral roll pairs 8 prevent a spring of the profile. Then, the longitudinal edges 5 of the rounded profile 12 in the region of the guide roller pair 9 are placed parallel to one another, with the cylinder rings 10 on the two rollers projecting into the longitudinal slot 13 in the rounded profile 12. Immediately 5 then the profile 12 through a coil inductor 14 and is thereby heated for a ca. 1 mm wide and approx. 1.5 mm long section to a temperature of 410 ° C. Then, the profile 12 runs through a vertical plunger pair 15, the longitudinal edges 5 being joined together to form a V-shaped slot 16 at a 10 ° angle of 6 ° at the welding point 17, positioned parallel to one another and welded together by pruning. In order to prevent a rupture of the still hot weld seam 18, a vertical lateral roller pair 19 is placed immediately after the vertical piece roller pair 15, and then the welded pipe 15 string is calibrated by three horizontal, one vertical and a further horizontal calibration roller pair 20, between the last horizontal roller pair 20 and the preceding vertical roller pair is a test device 21 for the welding seam. Those with a separating device 22 arranged after the calibration device, which may consist, for example, of a flying saw, cut off pipe sections for a desired length on an outlet channel 23.
De med opfindelsen opnåede fordele består navnlig i, at der af et af zink eller zinkvalselegeringer bestående 25 bånd automatisk og kontinuerligt kan fremstilles længdesømsvej ste rør med stor hastighed på indtil 200 m/min., idet styrken af svejsesømmen har de samme værdier som af båndmaterialet ved meget god forlængelse og udvidelse indtil 30%, så at enderne af rørafsnittene kan udvides problemfrit med 30 henblik på deres indbyrdes sammensættelighed.In particular, the advantages of the invention consist in the fact that a strip of zinc or zinc roll alloys can be manufactured automatically and continuously in longitudinally welded tubes at high velocities of up to 200 m / min, the strength of the welding seam having the same values as of the strip material. by very good extension and extension up to 30%, so that the ends of the pipe sections can be extended seamlessly with 30 for their interoperability.
3535
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873709784 DE3709784A1 (en) | 1987-03-25 | 1987-03-25 | METHOD AND DEVICE FOR PRODUCING THIN-WALLED TUBES |
| DE3709784 | 1987-03-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK161388D0 DK161388D0 (en) | 1988-03-24 |
| DK161388A DK161388A (en) | 1988-09-26 |
| DK167563B1 true DK167563B1 (en) | 1993-11-22 |
Family
ID=6323928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK161388A DK167563B1 (en) | 1987-03-25 | 1988-03-24 | PROCEDURE FOR THE MANUFACTURE OF THIN-WEIGHTED PIPES |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0284141B1 (en) |
| AT (1) | ATE75169T1 (en) |
| DE (2) | DE3709784A1 (en) |
| DK (1) | DK167563B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1268946B1 (en) * | 1994-02-18 | 1997-03-18 | Mazzonetto Srl | ZINC PIPE STRUCTURE OR ITS ALLOYS FOR TINSMITH AND PROCEDURES FOR ITS REALIZATION |
| DE19633423A1 (en) * | 1996-08-20 | 1998-02-26 | Rheinzink Gmbh | Process for the production of thin-walled pipes |
| DE10014519A1 (en) * | 2000-03-23 | 2001-10-11 | Rheinzink Gmbh | Use of pipes made of titanium zinc according to EN 988 and bending processes for the production of pipe bends |
| DE10137479A1 (en) * | 2001-08-02 | 2003-02-27 | Wurzer Georg | Welding process for connecting the edges of stainless steel sheets or profiles and manufacturing machine for hollow profiles |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2817364A (en) * | 1952-11-13 | 1957-12-24 | Thomas J Crawford | Welded tubing |
| US3015018A (en) * | 1959-07-13 | 1961-12-26 | Magnetic Heating Corp | Heating apparatus |
| FR1332630A (en) * | 1962-06-04 | 1963-07-19 | Lorraine Escaut Sa | Method and device for adjusting the thickness of a metal tube during manufacture |
| DE1752774A1 (en) * | 1968-07-12 | 1971-05-19 | Finow Walzwerk | Process and device for continuous weld seam preparation in the production of welded hollow profiles from metal strip |
| DE2607970C3 (en) * | 1976-02-27 | 1981-08-06 | Rheinisches Zinkwalzwerk Gmbh & Co Kg, 4354 Datteln | Device and method for soldering thin-walled pipes |
| JPS5750093Y2 (en) * | 1978-09-12 | 1982-11-02 | ||
| EP0127127A3 (en) * | 1983-05-27 | 1985-05-02 | Rolf Mattes | Process and apparatus for the production of a tube |
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1987
- 1987-03-25 DE DE19873709784 patent/DE3709784A1/en not_active Withdrawn
-
1988
- 1988-03-11 AT AT88200467T patent/ATE75169T1/en not_active IP Right Cessation
- 1988-03-11 DE DE8888200467T patent/DE3870294D1/en not_active Expired - Lifetime
- 1988-03-11 EP EP88200467A patent/EP0284141B1/en not_active Expired - Lifetime
- 1988-03-24 DK DK161388A patent/DK167563B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DK161388D0 (en) | 1988-03-24 |
| EP0284141B1 (en) | 1992-04-22 |
| DK161388A (en) | 1988-09-26 |
| DE3870294D1 (en) | 1992-05-27 |
| DE3709784A1 (en) | 1988-10-06 |
| EP0284141A2 (en) | 1988-09-28 |
| EP0284141A3 (en) | 1989-02-15 |
| ATE75169T1 (en) | 1992-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PBP | Patent lapsed | ||
| PUP | Patent expired |