EP1393830B1 - Continuous sheet metal bending machine - Google Patents
Continuous sheet metal bending machine Download PDFInfo
- Publication number
- EP1393830B1 EP1393830B1 EP03017934A EP03017934A EP1393830B1 EP 1393830 B1 EP1393830 B1 EP 1393830B1 EP 03017934 A EP03017934 A EP 03017934A EP 03017934 A EP03017934 A EP 03017934A EP 1393830 B1 EP1393830 B1 EP 1393830B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotating elements
- station
- sheet metal
- varying
- rotating
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- 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
- B21D5/08—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 making use of forming-rollers
Abstract
Description
- The present invention concerns a machine for continuous sheet metal bending, and in particular a bending machine used in the manufacture of pipes or open profiles.
- The bending machines used in pipe manufacturing are those bending machines provided with a series of stations placed in series and suitably spaced apart, wherein each station has a pair of opposed driven forming rollers through which the sheet metal to be processed passes. The rollers of each pair have a complementary profile and in particular, whilst the bottom roller has a concave profile, the top roller has a convex profile which reproduces exactly the curvature of the bottom roller.
- Each pair of opposed rollers has a radius of curvature smaller than the radius of curvature of the station situated directly upstream. Therefore, the sheet metal which is in the flat condition at the first station will progressively change its profile as it travels through the machine, taking on a substantially tubular shape at the last station and will thus be ready to be welded.
- It is obvious that to obtain tubes of different diameters it is necessary to change the opposed rollers and in particular it is necessary to replace them with rollers that have a different radius of curvature.
- Connecting carriages provided with idle rollers which also need to be replaced according to the diameter of the tubes processed by the machine are often placed between the various stations.
- Replacement of the rollers and in particular the time required for this operation is therefore one of the most critical factors in the production of pipes by bending.
- In the machines currently available on the market, replacement of the rollers requires several hours with complete stoppage, during this period of time, of the machine and thus of production. Furthermore, it is possible that on restarting of operation of the machine, increases in production waste may occur due to imperfect adjustment thereof.
- US-A-5 704 243 in accordance with the preamble of claim 1, discloses a station for a sheet metal bending machine, said station being provided with two opposed forming rollers to define the bending profile of the sheet metal, whereby each forming roller is defined by a pair of rotating elements coaxial and facing each other and means for varying the distance between the rotating elements of each pair are provided.
- JP-A-2000 117330 and JP-A-09239448 show bending stations provided with two opposed forming rollers to define the bending profile of the sheet metal.
- The object of the present invention is to solve the problems of the prior art, providing a machine that allows a reduction in set up times for passing from production of a pipe with a certain diameter to a pipe with a different diameter.
- Another object of the present invention is to provide a bending machine that allows the production waste due to setting up of the machine to be eliminated.
- Another object of the present invention is to simplify production of sheet metal pipes, reducing down time of the bending machine with a consequent improvement in investment and running costs of the machine.
- These and other objects are achieved by the present invention which presents the characteristics of appended independent claim 1.
- Advantageous embodiments of the invention are apparent from the dependent claims.
- Essentially, the bending machine according to the invention has two or more bending stations disposed in series, each station being provided with two opposed forming rollers to define the bending profile of the sheet metal, and is characterised in that each forming roller is defined by a pair of rotating elements, coaxial and facing each other, and in that means to vary the distance between the rotating elements of each pair are provided.
- According to a preferential feature of the present invention, the machine further comprises means for varying the inclination of the axis of rotation of each rotating element.
- It is therefore possible to vary the distance of the upper and lower rotating elements and the inclination thereof, thus setting up the machine for producing pipes of different diameters or of open sections provided with different radiuses of curvature. It no longer being necessary to change the rollers according to the diameter of the tube to be produced, it is possible to achieve high savings in time and consequently in production costs.
- Furthermore, it is no longer necessary to have available a plurality of sets of rollers, each dedicated to the production of a particular type of tube or of a particular open profile and this leads to an enormous saving in investment costs of the machine.
- According to a preferential feature of the present invention, the means for varying the distance comprise a movable support for the rotating element.
- According to an advantageous feature of the present invention, the movable support comprises sliding means slidably engageable on guides of the station to vary the reciprocal distance along the axis of rotation of the facing rotating elements.
- Each movable support advantageously comprises sliding means slidably engageable on vertical guides of the station to vary the vertical position of said rotating elements.
- According to another feature of the present invention, the means for varying the inclination of said rotating elements comprise a cylinder-piston assembly.
- The means for varying the inclination of the two rotating elements advantageously comprise at least two points of hinging.
- The possibility of translating and rotating the rotating element allows a wide adjustment thereof allowing the machine to be adapted to production of pipes of different diameter.
- Further characteristics and advantages of the present invention will be made clearer by the description that follows, made by way of non-limiting illustration with reference to the appended drawings, in which:
- Figure 1 is a side view of a machine for continuous bending of metal sheet according to the present invention;
- Figure 2 is a sectional front view of a forming station according to the present invention, taken along the line A-A of Figure 1; and
- Figure 3 is a detailed view of a movable support for the rotating element according to the present invention.
- With reference to Figure 1 a machine 1 for continuous bending of sheet metal according to the present invention is shown. The bending machine 1 comprises a plurality of
stations 2 disposed in series. Eachstation 2, as can be seen better in Figure 2, is provided with two opposed rollers (3, 4) through which the sheet metal to be processed passes, able to define the bending profile of the sheet metal, that is to say the shape taken on by the sheet metal after passing in the station. Each roller (3, 4) is defined by a pair of coaxial rotating elements (3a, 3b; 4a, 4b), facing each other and appropriately spaced apart from each other. In particular the top roller 3 is defined by the two rotatingelements elements element 3a cooperates with the rotatingelement 4a to which it is opposed and together with which defines the outer left bending profile of the sheet metal, the top rotatingelement 3b cooperates with the rotatingelement 4b to which it is opposed to define the outer right bending profile of the sheet metal. - The
station 2 is provided with means for varying the reciprocal distance of the two facing rotating elements. - In other words, means are present for horizontally translating along the common axis of rotation the position of the two rotating elements which define the same roller.
- Each station is also provided with means, described in greater detail further on, for varying the inclination of each rotating element (3a, 3b; 4a, 4b) and in particular the inclination of the axis of rotation of each rotating element.
- This allows the station 2 - and consequently the machine 1 - to be adapted, in a minimum time, to produce pipes or profiles of different diameters.
- For this purpose each rotating element (3a, 3b; 4a, 4b) is advantageously supported by a mobile support (5a, 5b; 6a, 6b) provided with sliding
means 8 able to engage a guide (not shown) disposed level with thebase 30 or with thetop 31 of thestation 2, parallel to the axes of rotation of the rotating elements. In detail, supports 5a and 5b of the bottom rotating elements slide onslides 32 disposed on thebase 30 of thestation 2, whilst the top supports 6a and 6b slide onslides 33 disposed at thetop 31 of thestation 2. - The means for varying the inclination of each rotating element (3a, 3b; 4a, 4b), as can be seen better in Figure 3, are formed by an upright 9 hinged at 16 to an L-
shaped crosspiece 10 fixed to a supportingmetal tube 23 of the rotating element. The upright 9 in turn consists of a cylinder-piston assembly formed by a cylinder 11 provided with an inner chamber wherein a piston, not shown directly, slides. The latter is provided with astem 12 which extends outside the cylinder 11 and is hinged at 16 to thecrosspiece 10. - The
cross piece 10, at the end not constrained to the upright 9, has apoint 14 of hinging with the movable support (5a, 5b; 6a, 6b). - Each supporting
metal tube 23, and thus the rotating element (3a, 3b; 4a, 4b) associated therewith, is fixed rotatably to the mobile support (5a, 5b; 6a, 6b) through a pin provided in thehinging point 14 which in this manner forms the pivot around which the rotating element (3a, 3b; 4a, 4b) rotates to vary its inclination. - Furthermore, the upright 9 has, level with its base, a
further hinging point 15. - By way of example, with reference to the support shown in Figure 3, raising of the
stem 12 of the piston leads to a clockwise rotation, as shown by the arrow F, of the rotating element around the point of hinging 14, whilst on the contrary, lowering thereof leads to an anti-clockwise rotation of the rotating element around thesame point 14, as shown again in Figure 3 by the arrow M. The threehinging points - Positioning relative to the rotating elements (3a, 3b; 4a, 4b) is adjusted by suitable automation means. In particular, there are present hydraulic operating means of the cylinder piston assemblies, four
electric motors 17 each of which is dedicated to sliding a support (5a, 5b; 6a, 6b) and twomotors 18, disposed at the top of thestation 2, for vertical movement of the rollers 3 and 4. - In particular, each support (5a, 5b; 6a, 6b) has, for horizontal translation thereof, a nut screw type engagement 7 with a
motor 17. - The
top supports vertical guides 21 which allow, under the guidance of themotors 18, vertical translation of said top supports 6a and 6b. Vertical translation of thesupports rotating elements - On the other hand, the bottom supports 5a and 5b are mounted, for their vertical movements, on
slides 32 vertically slidable in theguides 21. Theslides 32 also are guided in their vertical movements bymotors 18 which thus allow the position of the bottom rotatingelements - The vertical movements of the opposed rotating elements, although guided by the
same motor 18, are separate. In other words, it is possible to raise or to lower the support (6a, 6b) of a top rotating element (3a, 3b) leaving the position of the bottom rotating element (4a, 4b) unchanged or alternatively it is possible to raise and to lower the top (6a, 6b) and bottom supporting element (5a, 5b) at the same time. The possibility of moving each supporting element (5a, 5b; 6a, 6b) vertically in a separate manner makes it possible to carry out both so-called fixed centre pipe processing - where the axis of symmetry of the pipe remains fixed and thus the sheet metal is bent around said axis as it travels through thesuccessive stations 2 of the machine - and fixed throat processing where the central portion of the metal sheet which will form the bottom end of the pipe remains fixed. - All the
motors motors - Furthermore, the processor is able to respond to messages sent by suitable position control instruments, such as optical rulers or incremental encoders, not directly shown, to vary the relative position of the rotating elements (3a, 3b; 4a, 4b) so that the latter match each other perfectly in the pre-set radiuses of curvature.
- The rotating elements of the
stations 2 are all idle, but it would nevertheless be possible to motorise them without departing from the scope of the present invention. - To move the sheet metal between the various stations of the machine,
intermediate stations 20 provided with driven rotating members are present between two adjacent stations, as shown in Figure 1. - As previously mentioned, the rotating elements have a cylindrical shape provided with curved surfaces.
- In detail, the top rotating elements have a convex curved side profile and the bottom rotating elements have a concave curved side profile corresponding to that of the top rotating elements to define together therewith the outer bending shape of the sheet metal.
Claims (12)
- A station (2) for a sheet metal bending machine provided with two opposed forming rollers (3,4) to define the bending profile of the sheet metal, each forming roller (3, 4) being defined by a pair of rotating elements (3a, 3b; 4a, 4b) coaxial and facing each other, and where means for varying the distance between the rotating elements of each pair (3a, 3b; 4a, 4b), means for varying the inclination of the axis of rotation of said rotating elements (3a, 3b; 4a, 4b) and means for vertically moving at least one of said pairs of rotating elements (3a, 3b; 4a, 4b) are provided, said means for varying the distance comprising a movable support (5a, 5b; 6a, 6b) for each rotating element (3a, 3b; 4a, 4b),
characterised in that each support (5a, 5b; 6a, 6b) is independently moveable and inclinable and comprises sliding means slidably engageable on vertical guides (21) of said station (2) to vary its vertical position. - A station (2) according to claim 1, characterised in that each independently movable and inclinable support (5a, 5b; 6a, 6b) comprises sliding means (8) slidably engageable on guides (21) of said station (2) to vary the distance between said facing rotating elements (3a, 3b; 4a, 4b).
- A station (2) according to claims 1, characterised in that said means for varying the inclination of said rotating elements (3a, 3b; 4a, 4b) comprise a cylinder-piston assembly acting on a supporting metal tube (23) of the rotating element, each supporting metal tube being rotatably constrained to a moveable support (5a, 5b; 6a, 6b).
- A station (2) according to any one of claim 3, characterised in that said means for varying the inclination of said rotating elements (3a, 3b; 4a, 4b) comprise at least two hinging points.
- A station (2) according to any one of the preceding claims, characterised in that it further comprises automation means to vary the position of said rotating elements (3a, 3b; 4a, 4b).
- A station (2) according to claim 5, characterised in that said automation means comprise at least one electric motor, at least one processor and hydraulic operating means for said cylinder-piston assembly.
- A station (2) according to any one of the preceding claims, characterised in that it comprises control means of the reciprocal position of said rotating elements (3a, 3b; 4a, 4b).
- A station (2) according to any one of the preceding claims, characterised in that said rotating elements (3a, 3b; 4a, 4b) have a curved profile shape.
- A station (2) according to claim 5, characterised in that the top rotating elements (3a, 3b) have a convex curved profile and in that the bottom rotating elements (4a, 4b) have a concave curved profile corresponding to that of said top rotating elements (3a, 3b).
- A station (2) according to any of the preceding claims, characterised in that said rotating elements (3a, 3b; 4a, 4b) are idle.
- A sheet metal bending machine (1) comprising at least two stations (2) according to at least one of the preceding claims, disposed in series.
- A machine (1) according to claim 11, characterised in that it further comprises intermediate stations (20) provided with driven rollers to move the sheet metal between the various stations (2) of the machine (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20021855 | 2002-08-27 | ||
IT001855A ITMI20021855A1 (en) | 2002-08-27 | 2002-08-27 | CONTINUOUS SHEET BENDING MACHINE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1393830A1 EP1393830A1 (en) | 2004-03-03 |
EP1393830B1 true EP1393830B1 (en) | 2005-11-02 |
Family
ID=31198622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03017934A Expired - Lifetime EP1393830B1 (en) | 2002-08-27 | 2003-08-06 | Continuous sheet metal bending machine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1393830B1 (en) |
AT (1) | ATE308391T1 (en) |
DE (1) | DE60302119T2 (en) |
ES (1) | ES2252597T3 (en) |
IT (1) | ITMI20021855A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2498872C2 (en) * | 2008-09-18 | 2013-11-20 | Олимпия 80 С.Р.Л. | Machine with alternating linear structure for tube forming |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1394852B1 (en) * | 2009-07-21 | 2012-07-20 | Olimpia 80 Srl | VARIABLE LINEAR GEOMETRY MACHINE TO FORM SQUARE TUBES CONTINUOUSLY |
US8522589B2 (en) | 2010-12-28 | 2013-09-03 | Olimpia 80 S.R.L. | Machine of variable linear structure for the formation of tubes |
CN103028601B (en) * | 2011-10-09 | 2015-10-14 | 北方工业大学 | Continuous rolling and continuous roller forming method and device thereof |
CN104226762B (en) * | 2014-09-03 | 2017-03-29 | 兰州兰洛炼化设备有限公司 | Spiral lamina hemmer |
ITUB20159476A1 (en) * | 2015-12-23 | 2017-06-23 | Olimpia 80 Srl | FINISHING STATION OF A MACHINE FOR THE PRODUCTION OF SQUARE TUBES |
CN105478550B (en) * | 2016-01-14 | 2017-06-16 | 大连三高集团有限公司 | Adjustable inwall roller arrangement is rotated with angle and give bending forming machine using the device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991008064A1 (en) * | 1989-12-04 | 1991-06-13 | Kawasaki Steel Corporation | Apparatus for manufacturing welded steel pipe and method of operating thereof |
JPH0441021A (en) * | 1990-06-06 | 1992-02-12 | Sumitomo Metal Ind Ltd | Device for manufacturing welded pipe |
US5704243A (en) * | 1992-09-25 | 1998-01-06 | Nippon Steel Corporation | Forming method and forming stand for welded pipes |
JPH09239448A (en) * | 1996-03-06 | 1997-09-16 | Hitachi Metals Ltd | Resistance welded tube forming roll stand |
JP2000117330A (en) * | 1998-10-15 | 2000-04-25 | Aida Engineering Co Ltd | Roll forming mill |
-
2002
- 2002-08-27 IT IT001855A patent/ITMI20021855A1/en unknown
-
2003
- 2003-08-06 AT AT03017934T patent/ATE308391T1/en not_active IP Right Cessation
- 2003-08-06 DE DE60302119T patent/DE60302119T2/en not_active Expired - Lifetime
- 2003-08-06 EP EP03017934A patent/EP1393830B1/en not_active Expired - Lifetime
- 2003-08-06 ES ES03017934T patent/ES2252597T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2498872C2 (en) * | 2008-09-18 | 2013-11-20 | Олимпия 80 С.Р.Л. | Machine with alternating linear structure for tube forming |
Also Published As
Publication number | Publication date |
---|---|
ATE308391T1 (en) | 2005-11-15 |
EP1393830A1 (en) | 2004-03-03 |
ITMI20021855A1 (en) | 2004-02-28 |
DE60302119T2 (en) | 2006-07-20 |
ES2252597T3 (en) | 2006-05-16 |
DE60302119D1 (en) | 2005-12-08 |
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