EP2165779A1 - Machine of variable linear structure for the formation of tubes - Google Patents
Machine of variable linear structure for the formation of tubes Download PDFInfo
- Publication number
- EP2165779A1 EP2165779A1 EP09169379A EP09169379A EP2165779A1 EP 2165779 A1 EP2165779 A1 EP 2165779A1 EP 09169379 A EP09169379 A EP 09169379A EP 09169379 A EP09169379 A EP 09169379A EP 2165779 A1 EP2165779 A1 EP 2165779A1
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- EP
- European Patent Office
- Prior art keywords
- forming
- rollers
- station
- machine
- sheet metal
- 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.)
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 8
- 230000003247 decreasing effect Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 35
- 238000003466 welding Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
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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
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)
- Control Of Metal Rolling (AREA)
- Endoscopes (AREA)
- Soil Working Implements (AREA)
Abstract
Description
- 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.
- These machines of the prior art have the drawback of making it necessary to replace the pair of rollers when it is desired (or necessary) to change the diameter of the tube produced, which leads to more or less long machine downtimes which reduce the productivity of the plant.
- To overcome this serious drawback, machines for forming tubes by means of continuous bending of sheet metal have been proposed (such as, for example, that described in
European patent EP 1 393 830 in the name of the Applicant) in which the two pairs of rollers with matching profiles belonging to a station can make rototranslational movements of the same amplitude but in opposite directions, making it possible to use the same pairs of rollers to produce tubes whose diameter falls within a more or less broad range of values. - 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.
- This object is achieved by means of a machine which has the characterising features indicated in
independent claim 1. - Further advantageous characteristics of the invention form the subject matter of the dependent claims.
- 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 and7 ) 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. - The invention will now be described with reference to purely exemplifying (and therefore non limiting) embodiments thereof illustrated in the appended figures, wherein:
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Figure 1 shows diagrammatically a perspective view of a machine for the formation of tubes realised according to the invention; -
Figure 2 shows diagrammatically a side view of the machine ofFigure 1 ; -
Figure 3 shows diagrammatically a front view and an enlarged detail (Figure 3a ) of the first forming station of the machine ofFigure 1 ; -
Figure 4 shows diagrammatically, enlarged, a pair of forming rollers belonging to the first forming station ofFigure 3 ; -
Figure 5 shows diagrammatically, enlarged, the position assumed by the two pairs of forming rollers of the first forming station ofFigure 3 to produce three tubes of different diameters; -
Figure 6 shows diagrammatically a front view and an enlarged detail (Figure 6a ) of a second forming station of the machine ofFigure 1 ; -
Figure 7 shows diagrammatically, enlarged, the position assumed by the two pairs of forming rollers of the second forming station ofFigure 6 to produce the three tubes of different diameters ofFigure 5 ; -
Figure 8 shows diagrammatically a front view and an enlarged detail (Figure 8a ) of one of the containment stations situated downstream of the first forming station and of each of the second forming stations; -
Figure 9 shows diagrammatically a front view (Figure 9a ), a side view (Figure 9b ) sectioned along the plane F-F ofFigure 9a and an enlarged detail (Figure 9c ) of a finishing station belonging to the machine ofFigure 1 . - In the appended figures corresponding elements will be identified by means of the same reference numerals.
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Figure 1 shows diagrammatically a perspective view of amachine 1 according to the invention for the formation oftubes 2 which comprises, in series with each other, traction means 13 for the strip of sheet metal 4 (which enters themachine 1 in the direction of the arrow I), a first formingstation 3, second forming stations 3', containment stations 12 (each of which is situated downstream of a forming station), at least onefinishing station 5 and at least one welding station (per se known and omitted inFigures 1 and2 ), from which thetube 2 exits in the direction of the arrow U. - In the embodiment illustrated in
Figures 1 and2 themachine 1 comprises five second forming stations 3', six containment stations 12 (visible in the side view ofFigure 2 ) situated downstream of the forming stations (3 3') and twofinishing 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) andfinishing stations 5 can vary to meet the particular requirements of aspecific 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 toFigures 3-5 , a second forming station 3' will be described with reference toFigures 6-7 , acontainment station 12 will be described with reference toFigure 8 and afinishing station 5 will be described with reference toFigure 9 . -
Figure 2 shows diagrammatically a side view of themachine 1 ofFigure 1 , which makes it possible to see more clearly thecontainment stations 12 situated downstream of a forming station (3, 3'). -
Figure 3 shows diagrammatically a front view of the first formingstation 3 of themachine 1, symmetrical with respect to the midline, which comprises twovertical uprights 31 which support twohorizontal traverses 32, sliding along theuprights 31; along eachtraverse 32 slide twoshoes 33, on each of which is present apivot 34 which acts as a fulcrum for rotation of aunit 35 that carries one of the forming rollers (8, 8'). - The
pivots 34 and theunits 35, which can be seen better inFigure 3A , have not been designated with the corresponding reference numerals inFigure 3 for the sake of clarity of the graphic representation. - 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 inFigure 5 , which shows the position assumed by the two pairs in rollers (8, 8') for three diameters of thetube 2 coming within thetubes 2 that can be produced without replacing the forming rollers (8, 8'). - The sliding movements of the
horizontal traverses 32 along theuprights 31 and of theshoes 33 along thetraverses 32 and the rotation of theunits 35 around therelative pivots 34 are of the same amplitude and opposite direction, take place along guides indicated schematically with dashed lines inFigure 3 and are realised by means of activating means not described herein because they are per se known and not explicitly indicated inFigure 3 for the sake of simplicity of the graphic representation. -
Figure 3A shows diagrammatically, enlarged, the area of the first formingstation 3 comprising the two pairs of rollers (8, 8'), supported by theunits 35, which deform the outermost area of the strip ofsheet metal 4. -
Figure 4 shows diagrammatically, enlarged, a pair of forming rollers (8, 8'), realised according to the invention, belonging to the first formingstation 3; fromFigure 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 theupper rollers 8 is elliptical with a curvature increasing from the outer edge to the inner edge of theroller 8. - The ellipses to which the profiles of the
rollers 8 and 8' belong have been indicated with dashed lines inFigure 4 . -
Figure 5 shows diagrammatically, enlarged, the position assumed by the two pairs of forming rollers (8, 8') of the first formingstation 3 to produce threetubes 2 of different diameter coming within thetubes 2 that can be produced without replacing the forming rollers (8, 8'): the elliptical profiles of therollers 8 and 8' allow the radius of curvature of the outermost areas of the strip ofsheet 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 themachine 1, situated downstream of the first formingstation 3, from which it differs essentially in that theupper rollers 8" have a circular profile whose radius corresponds to the minimum radius of curvature (within the range oftubes 2 that can be produced without replacing the formingrollers 8' and 8") of the bent strip ofsheet 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 thesheet metal 4. - The
pivots 34 and theunits 35, seen better inFigure 6a , have not been designated inFigure 6 with the corresponding reference numerals for the sake of clarity of the graphic representation. -
Figure 6a shows diagrammatically, enlarged, a pair of forming rollers (8", 8'), realised according to the invention, belonging to a second forming station 3'; fromFigure 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 theupper 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' ofFigure 6 to produce the three tubes of different diameter ofFigure 5 : the elliptical profile of the lower rollers 8' allows the radius of curvature of the inner part of the strip ofsheet metal 4 to be modified by modifying only the position and orientation of the formingrollers 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.
- Moreover, from the foregoing description it is obvious that, in the machine of the present invention, the strip of
sheet metal 4 is not deformed by pairs of forming rollers (8, 8', 8") having matching profiles: this represents an obvious feature able to differentiate the machine of the present invention from machines of the prior art including that described inEuropean patent EP 1 393 830 . -
Figure 8 shows diagrammatically a front view of one of thecontainment stations 12 situated downstream of the formingstations 3 and 3'. - This
station 12, symmetrical with respect to the midline, consists of twoguides 81, fixed touprights 31, each of which allows translation along an inclined axis of ashoe 82 which supports anidle roller 83, having a concave profile, which guides and supports the strip ofsheet metal 4 between two adjacent forming stations (3, 3'). - The
containment stations 12 can be omitted without departing from the scope of the invention. - The upper part of each
rollers 83 presents a protruding disc element 84 (seen better inFigure 8a , which shows diagrammatically an enlarged detail of the containment station 12), which protrudes with respect to the body of theroller 83 to contain the edge 6 of the strip ofsheet metal 4. -
Figure 9a shows diagrammatically a front view (Figure 9a ) and a side view sectioned along the plane F-F ofFigure 9a (Figure 9b ) of afinishing station 5 belonging to themachine 1, which differs from the forming stations (3, 3') previously described essentially in that each of theunits 35 carries a formingroller 91 acting on the outer surface of the strip ofsheet metal 4 bent to form thetube 2 and in that it further comprises aroller 92, the position of which between the edges 6 of the strip ofsheet metal 4 forming thetube 2 is adjustable by means of alever 93 operated in a per se known manner. - The
units 35 and therollers Figure 9c , have not been designated with the corresponding reference numerals inFigure 9a for the sake of clarity of the graphic representation. - The forming
rollers 91 have a concave profile, with a constant curvature equal to the maximum value of the curvature presented by the strip ofbent sheet metal 4 in correspondence to thefinishing station 5 during production of one of thetubes 2 that can be produced without replacing the forming rollers (8, 8', 8") of the forming stations (3, 3'); theroller 92 has a convex V-shaped profile. - In
Figure 9b the strip ofsheet metal 4, one of the formingrollers 91, theroller 92 inserted in the strip ofsheet metal 4 and thelever 93 which adjusts the position of theroller 92 can be seen. -
Figure 9c shows diagrammatically an enlarged detail of thefinishing station 5 ofFigure 9a , where the formingrollers 91 acting on the outer surface of the strip ofsheet metal 4 bent to form thetube 2 and theroller 92 situated between the edges 6 of the strip ofsheet metal 4 can be seen better. - Without departing form the scope of the invention, a person skilled in the art can make to the above described machine with variable linear structure all the modifications and improvements suggested by normal experience and/or by the natural evolution of the art.
Claims (10)
- A machine (1) for the continuous formation of tubes (2) including, in series between each other, forming stations (3, 3') able to progressively bend a strip of sheet metal (4) and at least one finishing station (5) able to further bring together the edges (6) of the bent strip of sheet metal (4) in view of the final welding, each forming station (3, 3') including two pairs of idle forming rollers (8, 8', 8") able to carry out rototranslational movements of the same extent but in opposite directions,
characterized in that:- the profile of the lower rollers (8') of each forming station (3, 3') is elliptical with a decreasing curvature from the outside edge to the inside edge of said roller (8');- the profile of the upper rollers (8) of the first forming station (3) is elliptical with increasing curvature from the outside edge to the inside edge of said roller (8);- the profile of the upper rollers (8") of the forming stations (3') subsequent to the first one (3) is circular. - The machine (1) as in claim 1, characterized in that the at least one finishing station (5) includes four idle forming rollers (91), having a concave profile with a constant curvature, able to carry out movements of the same extent and direction according to 90° axes.
- The machine (1) as in claim 1, characterized in that the radius of the circular profile of the upper rollers (8") of each forming station (3') subsequent to the first one (3) corresponds to the minimum radius of curvature of the bent strip of sheet metal (4) in correspondence of said forming station (3') subsequent to the first one (3).
- The machine (1) as in claim 1, characterized in that each forming station (3, 3') and at least one finishing station (5) include two vertical uprights (31) that support two horizontal traverses (32) sliding along the uprights (31), along each of said traverses (32) sliding two shoes (33), on each of which is present a pivot (34) that acts as a fulcrum for the rotation of a unit (35) that carries one of the forming rollers (8, 8' , 8"; 91).
- The machine (1) as in claim 1, characterized in that the pairs of forming rollers (8, 8') belonging to the first forming station (3) deform the outermost areas of the strip of sheet metal (4) and in that the pair of forming rollers (8', 8"), belonging to the forming stations (3') subsequent to the first one (3), deform the inner part of the strip of sheet metal (4).
- The machine (1) as in claim 1, characterized in that it also includes containment stations (12), each of which is situated after a forming station (3, 3').
- The machine (1) as in claim 6, characterized in that each containment station (12) includes two guides (81), fixed to the uprights (31), each of which allows the translation according to an inclined axis of a shoe (82) that carries a roller (83), having a concave profile, able to guide and to support the strip of sheet metal (4) between two adjacent forming stations (3, 3').
- The machine (1) as in claim 7, characterized in that the upper part of each roller (83) presents a disc element (84), protruding from the body of the roller (83), able to contain the edge (6) of the strip of sheet metal (4).
- The machine (1) as in claim 4, characterized in that each of the units (35) of at least one finishing station (5) 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 also includes a roller (92) and a lever (93) able to adjust the position of the roller (92) between the edges (6) of the strip of sheet metal (4) forming the tube (2).
- The machine (1) as in claim 9, characterized in that the forming rollers (91) have a concave profile, with a curvature constant and equal to the maximum value of the curvature presented by the bent strip of sheet metal (4) in correspondence of the finishing station (5) during the production of one of the tubes (2) which are producible without replacing the forming rollers (8, 8', 8") of the forming stations (3, 3') and in that the roller (92) has a convex V-shaped profile.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2008A001662A IT1392055B1 (en) | 2008-09-18 | 2008-09-18 | VARIABLE LINEAR GEOMETRY MACHINE FOR TUBE FORMATION |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2165779A1 true EP2165779A1 (en) | 2010-03-24 |
EP2165779B1 EP2165779B1 (en) | 2014-12-31 |
Family
ID=41055062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20090169379 Active EP2165779B1 (en) | 2008-09-18 | 2009-09-03 | Machine of variable linear structure for the formation of tubes |
Country Status (6)
Country | Link |
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EP (1) | EP2165779B1 (en) |
CN (1) | CN101676043B (en) |
BR (1) | BRPI0903482A2 (en) |
ES (1) | ES2533660T3 (en) |
IT (1) | IT1392055B1 (en) |
RU (1) | RU2498872C2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US9192972B2 (en) * | 2010-11-04 | 2015-11-24 | Nakata Manufacturing Co., Ltd. | Forming method and forming device |
CN103302145B (en) * | 2013-06-14 | 2015-04-22 | 娄底市高盛板业有限公司 | 90-degree angle plate forming equipment for indoor drain pipe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2529466A1 (en) * | 1974-07-31 | 1976-02-19 | Huette Krems Ges Mbh Krems | Production of welded tube with various dimensions - has roll assemblies to bend flat sheet to produce pipe ready for welding |
EP0988905A2 (en) * | 1998-08-24 | 2000-03-29 | Kusakabe Electric & Machinery Co., Limited | Tube forming machine using three point bending |
EP1393830A1 (en) | 2002-08-27 | 2004-03-03 | Olimpia 80 SRL | Continuous sheet metal bending machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI74414C (en) * | 1980-08-18 | 1988-02-08 | Sl Tuotanto Oy | ANORDING FOR FRAMSTAELLNING AV ETT METALLROER. |
RU2042445C1 (en) * | 1993-03-29 | 1995-08-27 | Новолипецкий металлургический комбинат | Tube forming mill |
JP2001259733A (en) * | 2000-03-16 | 2001-09-25 | Mitsubishi Shindoh Co Ltd | Method and apparatus for manufacturing seam welded pipe |
CN2471445Y (en) * | 2001-03-08 | 2002-01-16 | 刘玲 | Dual head ear bender |
CN2491148Y (en) * | 2001-07-09 | 2002-05-15 | 吴友国 | Stirrup bending former |
RU2218224C1 (en) * | 2002-06-21 | 2003-12-10 | ОАО Верхнесалдинское металлургическое производственное объединение | Roll passes for asymmetric forming of breakdowns out of hard-to-form alloys |
RU2232655C1 (en) * | 2002-12-27 | 2004-07-20 | Открытое акционерное общество "Северсталь" | Method for making electrically welded straight -seam tubes |
-
2008
- 2008-09-18 IT ITMI2008A001662A patent/IT1392055B1/en active
-
2009
- 2009-09-03 EP EP20090169379 patent/EP2165779B1/en active Active
- 2009-09-03 ES ES09169379.6T patent/ES2533660T3/en active Active
- 2009-09-17 RU RU2009134904/02A patent/RU2498872C2/en not_active IP Right Cessation
- 2009-09-17 CN CN200910174777.9A patent/CN101676043B/en not_active Expired - Fee Related
- 2009-09-17 BR BRPI0903482 patent/BRPI0903482A2/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2529466A1 (en) * | 1974-07-31 | 1976-02-19 | Huette Krems Ges Mbh Krems | Production of welded tube with various dimensions - has roll assemblies to bend flat sheet to produce pipe ready for welding |
EP0988905A2 (en) * | 1998-08-24 | 2000-03-29 | Kusakabe Electric & Machinery Co., Limited | Tube forming machine using three point bending |
EP1393830A1 (en) | 2002-08-27 | 2004-03-03 | Olimpia 80 SRL | Continuous sheet metal bending machine |
Also Published As
Publication number | Publication date |
---|---|
IT1392055B1 (en) | 2012-02-09 |
CN101676043B (en) | 2014-07-16 |
EP2165779B1 (en) | 2014-12-31 |
ITMI20081662A1 (en) | 2010-03-19 |
ES2533660T3 (en) | 2015-04-13 |
RU2009134904A (en) | 2011-03-27 |
BRPI0903482A2 (en) | 2010-07-20 |
RU2498872C2 (en) | 2013-11-20 |
CN101676043A (en) | 2010-03-24 |
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