EP2165779B1 - Maschine mit variabler linearer Struktur zur Formung von Rohren - Google Patents

Maschine mit variabler linearer Struktur zur Formung von Rohren Download PDF

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Publication number
EP2165779B1
EP2165779B1 EP20090169379 EP09169379A EP2165779B1 EP 2165779 B1 EP2165779 B1 EP 2165779B1 EP 20090169379 EP20090169379 EP 20090169379 EP 09169379 A EP09169379 A EP 09169379A EP 2165779 B1 EP2165779 B1 EP 2165779B1
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European Patent Office
Prior art keywords
forming
rollers
station
machine
sheet metal
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EP20090169379
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English (en)
French (fr)
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EP2165779A1 (de
Inventor
Vittorio Travini
Riccardo Bosoni
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Olimpia 80 SRL
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Olimpia 80 SRL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
    • 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

  • the present invention refers to a machine for the formation of tubes, called “of variable linear structure", which comprises a plurality of forming stations, placed in series with each other, which progressively bend a strip of sheet metal to form a tube, followed by at least one finishing station which further brings together the edges of the bent strip of sheet metal in view of the final welding.
  • Machines for forming tubes by means of continuous bending of sheet metal are well known to the art and comprise, in series with each other, a plurality of stations in which the strip of sheet metal is progressively deformed by pairs of rollers having matching profiles.
  • Object of the present invention is to realise a machine "of variable linear structure" for the formation of tubes, which improves the performance of machines of the type described, for example, by the aforementioned European patent since it allows the range of values of the diameter of the tubes to be widened without having to replace the pairs of rollers.
  • a machine for continuous formation of tubes realised according to the invention comprises, in series with each other, forming stations which progressively bend a strip of sheet metal and at least one finishing station which further brings together the edges of the bent strip of sheet metal in view of the final welding.
  • Each forming station comprises two pairs of idle forming rollers which make rototranslational movements of the same amplitude but in opposite directions and the at least one finishing station comprises four idle forming rollers able to make movements of the same amplitude and direction according to 90° axes.
  • the profile of the lower rollers of each forming station is elliptical with a decreasing curvature from the outer edge to the inner edge of said roller, that of the upper rollers of the first forming station is elliptical with an increasing curvature from the outer edge to the inner edge of said roller, that of the upper rollers of the forming stations subsequent to the first one (hereafter called "second forming stations") is circular and that of the forming rollers of the at least one finishing station is concave with a constant curvature.
  • the radius of the circular profile of the upper rollers of each second forming station preferably corresponds to the minimum radius of curvature of the bent strip of sheet metal in correspondence of said second forming station and the curvature of the concave profile of the forming rollers of the at least one finishing station corresponds to the maximum curvature of the bent strip of sheet metal in correspondence of said finishing station.
  • a machine according to the invention is called "of variable linear structure" since (as indicated very diagrammatically in Figures 5 and 7 ) makes it possible to produce tubes of different diameters by changing the reciprocal positions of the two pairs of rollers and those of each of the rollers of each pair.
  • Figure 1 shows diagrammatically a perspective view of a machine 1 according to the invention for the formation of tubes 2 which comprises, in series with each other, traction means 13 for the strip of sheet metal 4 (which enters the machine 1 in the direction of the arrow I), a first forming station 3, second forming stations 3', containment stations 12 (each of which is situated downstream of a forming station), at least one finishing station 5 and at least one welding station (per se known and omitted in Figures 1 and 2 ), from which the tube 2 exits in the direction of the arrow U.
  • the machine 1 comprises five second forming stations 3', six containment stations 12 (visible in the side view of Figure 2 ) situated downstream of the forming stations (3 3') and two finishing stations 5 but, without departing from the scope of the invention, the number of second forming stations 3' (and, consequently, that of containment stations 12) and finishing stations 5 can vary to meet the particular requirements of a specific machine 1.
  • the traction means 13 will not be described because they are per se known.
  • the first forming station 3 will be described with reference to Figures 3-5
  • a second forming station 3' will be described with reference to Figures 6-7
  • a containment station 12 will be described with reference to Figure 8
  • a finishing station 5 will be described with reference to Figure 9 .
  • Figure 2 shows diagrammatically a side view of the machine 1 of Figure 1 , which makes it possible to see more clearly the containment stations 12 situated downstream of a forming station (3, 3').
  • Figure 3 shows diagrammatically a front view of the first forming station 3 of the machine 1, symmetrical with respect to the midline, which comprises two vertical uprights 31 which support two horizontal traverses 32, sliding along the uprights 31; along each traverse 32 slide two shoes 33, on each of which is present a pivot 34 which acts as a fulcrum for rotation of a unit 35 that carries one of the forming rollers (8, 8').
  • This supporting structure (32, 33, 34) allows the axes of the forming rollers (8, 8') to perform a rototranslational movement, in the vertical plane, inside the forming station 3 that allows a considerable freedom in positioning and orienting the rollers (8, 8') of each pair, whilst always keeping them in contact with each other, to adapt them to the diameter of the tube to be produced, as schematically indicated in Figure 5 , which shows the position assumed by the two pairs in rollers (8, 8') for three diameters of the tube 2 coming within the tubes 2 that can be produced without replacing the forming rollers (8, 8').
  • Figure 3A shows diagrammatically, enlarged, the area of the first forming station 3 comprising the two pairs of rollers (8, 8'), supported by the units 35, which deform the outermost area of the strip of sheet metal 4.
  • Figure 4 shows diagrammatically, enlarged, a pair of forming rollers (8, 8'), realised according to the invention, belonging to the first forming station 3; from Figure 4 it can be seen that the profile of the lower rollers 8' is elliptical with a curvature decreasing from the outer edge to the inner edge of the roller 8', whereas the profile of the upper rollers 8 is elliptical with a curvature increasing from the outer edge to the inner edge of the roller 8.
  • Figure 5 shows diagrammatically, enlarged, the position assumed by the two pairs of forming rollers (8, 8') of the first forming station 3 to produce three tubes 2 of different diameter coming within the tubes 2 that can be produced without replacing the forming rollers (8, 8'): the elliptical profiles of the rollers 8 and 8' allow the radius of curvature of the outermost areas of the strip of sheet metal 4 to be modified by modifying only the position and orientation of the rollers (8, 8').
  • Figure 6 shows diagrammatically a front view of one of the second forming stations 3' of the machine 1, situated downstream of the first forming station 3, from which it differs essentially in that the upper rollers 8" have a circular profile whose radius corresponds to the minimum radius of curvature (within the range of tubes 2 that can be produced without replacing the forming rollers 8' and 8") of the bent strip of sheet metal 4 in correspondence of said second forming station 3' and in that the pairs of forming rollers (8', 8") belonging to the second forming stations 3' deform the inner part of the strip of the sheet metal 4.
  • Figure 6a shows diagrammatically, enlarged, a pair of forming rollers (8", 8'), realised according to the invention, belonging to a second forming station 3'; from Figure 6a it can be seen that the profile of the lower rollers 8' is elliptical with a curvature decreasing from the outer edge to the inner edge of the roller 8', whereas the profile of the upper rollers 8" is circular.
  • Figure 7 shows diagrammatically, enlarged, the position assumed by the two pairs of forming rollers (8', 8") of the second forming station 3' of Figure 6 to produce the three tubes of different diameter of Figure 5 : the elliptical profile of the lower rollers 8' allows the radius of curvature of the inner part of the strip of sheet metal 4 to be modified by modifying only the position and orientation of the forming rollers 8' and 8".
  • the amplitude of the rototranslational movements permitted to the forming rollers (8, 8', 8") by the supporting structure (32, 33, 34) and the particular profiles of the forming rollers (8, 8', 8") allow the range of values of the diameter of the tubes which can be produced without having to replace the forming (8, 8', 8") to be increased with respect to machines of the prior art.
  • Figure 8 shows diagrammatically a front view of one of the containment stations 12 situated downstream of the forming stations 3 and 3'.
  • This station 12 symmetrical with respect to the midline, consists of two guides 81, fixed to uprights 31, each of which allows translation along an inclined axis of a shoe 82 which supports an idle roller 83, having a concave profile, which guides and supports the strip of sheet metal 4 between two adjacent forming stations (3, 3').
  • the containment stations 12 can be omitted without departing from the scope of the invention.
  • each rollers 83 presents a protruding disc element 84 (seen better in Figure 8a , which shows diagrammatically an enlarged detail of the containment station 12), which protrudes with respect to the body of the roller 83 to contain the edge 6 of the strip of sheet metal 4.
  • Figure 9a shows diagrammatically a front view ( Figure 9a ) and a side view sectioned along the plane F-F of Figure 9a ( Figure 9b ) of a finishing station 5 belonging to the machine 1, which differs from the forming stations (3, 3') previously described essentially in that each of the units 35 carries a forming roller 91 acting on the outer surface of the strip of sheet metal 4 bent to form the tube 2 and in that it further comprises a roller 92, the position of which between the edges 6 of the strip of sheet metal 4 forming the tube 2 is adjustable by means of a lever 93 operated in a per se known manner.
  • the forming rollers 91 have a concave profile, with a constant curvature equal to the maximum value of the curvature presented by the strip of bent sheet metal 4 in correspondence to the finishing station 5 during production of one of the tubes 2 that can be produced without replacing the forming rollers (8, 8', 8") of the forming stations (3, 3'); the roller 92 has a convex V-shaped profile.
  • Figure 9c shows diagrammatically an enlarged detail of the finishing station 5 of Figure 9a , where the forming rollers 91 acting on the outer surface of the strip of sheet metal 4 bent to form the tube 2 and the roller 92 situated between the edges 6 of the strip of sheet metal 4 can be seen better.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Soil Working Implements (AREA)
  • Control Of Metal Rolling (AREA)
  • Endoscopes (AREA)

Claims (10)

  1. Maschine (1) zur fortlaufenden Formung von Rohren (2), enthaltend, in Reihe untereinander, Formstationen (3, 3'), die zum fortschreitenden Biegen eines Blechstreifens (4) imstande sind, und zumindest eine Endbearbeitungsstation (5), die zum weiteren Zusammenführen der Kanten (6) der gebogenen Blechstreifen (4) im Hinblick auf das finale Schweißen imstande ist, wobei jede Formstation (3, 3') zwei leerlaufende Formwalzen (8, 8', 8") enthält, die zum Ausführen von rototranslatorischen Bewegungen im selben Ausmaß, jedoch in entgegengesetzte Richtungen imstande sind, dadurch gekennzeichnet, dass:
    - das Profil der unteren Walzen (8') jeder Formstation (3,3') elliptisch mit einer abnehmenden Krümmung von der Außenkante zur Innenkante der Walze (8') ist;
    - das Profil der oberen Walzen (8) der ersten Formstation (3) elliptisch mit zunehmender Krümmung von der Außenkante zur Innenkante der Walze (8) ist;
    - das Profil der oberen Walzen (8") der Formstationen (3') im Anschluss an die erste (3) kreisförmig ist.
  2. Maschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass die zumindest eine Endbearbeitungsstation (5) vier leerlaufende Formwalzen (91) mit einem konkaven Profil mit einer konstanten Krümmung enthält, welche zum Ausführen von Bewegungen im selben Ausmaß und Richtung gemäß 90°-Achsen imstande sind.
  3. Maschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Radius des kreisförmigen Profils der oberen Walzen (8") jeder Formstation (3') im Anschluss an die erste (3) dem Minimalkrümmungsradius des gebogenen Blechstreifens (4) in Entsprechung zur Formstation (3'), die an die erste (3) anschließt, entspricht.
  4. Maschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass jede Formstation (3, 3') und zumindest eine Endbearbeitungsstation (5) zwei vertikale Pfosten (31) enthalten, die zwei Querstreben (32) stützen, welche die Pfosten (31) entlang gleiten, wobei entlang jeder der Querstreben (32) zwei Schuhe (33) gleiten, wobei an jedem derselben ein Drehgelenk (34) vorhanden ist, das als Hebelpunkt für die Drehung einer Einheit (35) wirkt, welche eine der Formwalzen (8, 8', 8"; 91) trägt.
  5. Maschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Paare von Formwalzen (8, 8'), die zur ersten Formstation (3) gehören, die äußersten Bereiche des Blechstreifens (4) verformen, und dass das Paar Formwalzen (8', 8"), das zu den Formstationen (3') gehört, welche an die erste (3) anschließen, das Innenteil des Blechstreifens (4) verformen.
  6. Maschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass sie außerdem Einschließungsstationen (12) enthält, die jede nach einer Formstation (3, 3') angeordnet ist.
  7. Maschine (1) nach Anspruch 6, dadurch gekennzeichnet, dass jede Einschlieβungsstation (12) zwei Führungen (81), die an den Pfosten (31) befestigt sind, enthält, die jede die Verschiebung gemäß einer schrägen Achse eines Schuhs (82), der eine Walze (83) trägt, ermöglicht und ein konkaves Profil aufweist und zum Führen und Stützen des Blechstreifens (4) zwischen zwei benachbarten Formstationen (3, 3') imstande ist.
  8. Maschine (1) nach Anspruch 7, dadurch gekennzeichnet, dass das obere Teil jeder Walze (83) ein Scheibenelement (84) aufweist, das vom Körper der Walze (83) vorsteht und zum Einschließen der Kante (6) des Blechstreifens (4) imstande ist.
  9. Maschine (1) nach Anspruch 4, dadurch gekennzeichnet, dass jede der Einheiten (35) von zumindest einer Endbearbeitungsstation (5) eine Formwalze (91) trägt, die auf die Außenfläche des Blechstreifens (4) einwirkt, welcher zum Formen des Rohrs (2) gebogen ist, und dass sie außerdem eine Walze (92) und einen Hebel (93) enthält, der zum Einstellen der Walze (92) zwischen den Kanten (6) des Blechstreifens (4), der das Rohr (2) formt, imstande ist.
  10. Maschine (1) nach Anspruch 9, dadurch gekennzeichnet, dass die Formwalzen (91) ein konkaves Profil mit einer Krümmung, die konstant und gleich dem Maximalwert der Krümmung ist, welche der gebogene Metallstreifen (4) entsprechend der Endbearbeitungsstation (5) während der Produktion von einem der Rohre (2), welche ohne Austauschen der Formwalzen (8, 8', 8") der Formstationen (3, 3') herstellbar sind, aufweisen, und dass die Walze (92) ein konvexes, V-förmiges Profil aufweist.
EP20090169379 2008-09-18 2009-09-03 Maschine mit variabler linearer Struktur zur Formung von Rohren Active EP2165779B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2008A001662A IT1392055B1 (it) 2008-09-18 2008-09-18 Macchina a geometria lineare variabile per la formazione di tubi

Publications (2)

Publication Number Publication Date
EP2165779A1 EP2165779A1 (de) 2010-03-24
EP2165779B1 true EP2165779B1 (de) 2014-12-31

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EP (1) EP2165779B1 (de)
CN (1) CN101676043B (de)
BR (1) BRPI0903482A2 (de)
ES (1) ES2533660T3 (de)
IT (1) IT1392055B1 (de)
RU (1) RU2498872C2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103201053B (zh) * 2010-11-04 2015-09-02 株式会社中田制作所 成型方法及成型装置
CN103302145B (zh) * 2013-06-14 2015-04-22 娄底市高盛板业有限公司 一种用于室内排水管的90°角板成型设备

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT329948B (de) * 1974-07-31 1976-06-10 Krems Huette Gmbh Verfahren und vorrichtung zum herstellen von geschweissten rohren verschiedener dimensionen
FI74414C (fi) * 1980-08-18 1988-02-08 Sl Tuotanto Oy Anordning foer framstaellning av ett metallroer.
RU2042445C1 (ru) * 1993-03-29 1995-08-27 Новолипецкий металлургический комбинат Трубоформовочный стан
JP3369483B2 (ja) * 1998-08-24 2003-01-20 日下部電機株式会社 電縫溶接管の製造装置
JP2001259733A (ja) * 2000-03-16 2001-09-25 Mitsubishi Shindoh Co Ltd 電縫管の製造装置および製造方法
CN2471445Y (zh) * 2001-03-08 2002-01-16 刘玲 双头卷耳机
CN2491148Y (zh) * 2001-07-09 2002-05-15 吴友国 箍筋弯曲成型机
RU2218224C1 (ru) * 2002-06-21 2003-12-10 ОАО Верхнесалдинское металлургическое производственное объединение Валковые калибры асимметричной формовки трубной заготовки из труднодеформируемых сплавов
ITMI20021855A1 (it) * 2002-08-27 2004-02-28 Olimpia 80 Srl Macchina di piegatura di lamiera in continuo.
RU2232655C1 (ru) * 2002-12-27 2004-07-20 Открытое акционерное общество "Северсталь" Способ изготовления электросварных прямошовных труб

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Publication number Publication date
BRPI0903482A2 (pt) 2010-07-20
CN101676043B (zh) 2014-07-16
IT1392055B1 (it) 2012-02-09
RU2498872C2 (ru) 2013-11-20
CN101676043A (zh) 2010-03-24
ITMI20081662A1 (it) 2010-03-19
EP2165779A1 (de) 2010-03-24
ES2533660T3 (es) 2015-04-13
RU2009134904A (ru) 2011-03-27

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