EP4255651A1 - Verfahren zur vorformung von metallblech sowie computerprogramm und einrichtung zur durchführung des verfahrens - Google Patents
Verfahren zur vorformung von metallblech sowie computerprogramm und einrichtung zur durchführung des verfahrensInfo
- Publication number
- EP4255651A1 EP4255651A1 EP21809985.1A EP21809985A EP4255651A1 EP 4255651 A1 EP4255651 A1 EP 4255651A1 EP 21809985 A EP21809985 A EP 21809985A EP 4255651 A1 EP4255651 A1 EP 4255651A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- bending
- circular arc
- roller
- sectional profile
- 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.)
- Withdrawn
Links
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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0818—Manufacture of tubes by drawing of strip material through dies
-
- 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
- B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
Definitions
- the invention relates to a method for preforming sheet metal in the form of strips or plates with a flat cross-sectional profile to form a cross-sectional profile in the shape of an arc of a circle or approximately in the shape of an arc of a circle in a pre-forming section of a plant for the production of slotted tubes.
- the invention also relates to a computer program for carrying out specific method steps of the method according to the invention.
- the invention relates to a device for carrying out the method.
- Metal pipes can be made seamless, with longitudinal welds or helical welds. The latter are generally referred to as spiral tubes.
- Longitudinally welded tubes are manufactured from metal strips or metal sheets deformed into slit tubes, which are welded along a slit extending longitudinally in the bent metal sheet.
- the starting material is, for example, metal strips, which are unwound from coils and continuously bent into a slotted tube and welded to one another in the area of the longitudinally extending slot that is created in this way.
- individual panels can serve as the starting material, which are processed accordingly.
- the metal sheets are bent into a metal tube by means of various roll stands in a preforming line to form a concave shape and in fin-pass stands, for example in the form of Knife disc frames formed into a slotted tube and then welded and, if necessary, cut to length into individual sections of tube.
- the preform line typically includes single stands with concave bottom rolls, referred to as break-down stands, and/or stands with ruler guides.
- the rollers of the individual stands have to be designed in a complex manner to produce a corresponding pipe and adjusted for the respective product.
- These stands usually include a variety of different rolls with different radii and different dimensions. For a deformation with rulers, complex design and adjustment calculations have to be carried out.
- DE 699 26 406 T2 describes a method and a device for roll-forming steel pipes, in which a metal strip is bent around a squeezing edge at the edge, with a target deformation zone of the strip being bent around a roller surface of an upper roller.
- a contact roller is designed to press a center portion of the material in the transverse direction from a bending outside to bend a W-shaped cross section.
- stands with lateral auxiliary rollers are provided which bend the lateral edges of the metal strip towards the center line of the preform.
- the known methods and devices have the disadvantage that either a large number of different rollers with different radii and different angles of attack or complex tools are required.
- the object of the invention is to provide a method for preforming sheet metal in a preforming stretch and a device for preforming sheet metal, which makes do with a reduced number of different rollers with a relatively low roller weight.
- the invention is also based on the object of automating individual steps of the method with the aid of a computer.
- the object on which the invention is based is achieved by a method having the features of claim 1, a computer program for carrying out at least one of the method steps according to the invention and by a device which is preferably suitable and intended for carrying out the method according to the invention.
- One aspect of the invention relates to a method for preforming sheet metal in the form of strips or plates with a flat cross-sectional profile to form a cross-sectional profile in the shape of a circular arc in a preforming section of a plant for the production of open-seam tubes, the metal sheet in the preforming section being rolled by roll forming in a plurality of successive sections in one direction of transport bending steps, the circular cross-sectional profile is applied, the cross-sectional profile being produced by stepwise bending of individual circular arc sections or individual profile sequences, each from an outer edge of the metal sheet in the direction of a center line, in such a way that the individual circular arc sections directly adjoin one another or at least partially overlap.
- the core of the method according to the invention is that the desired radius of the preformed metal sheet, i.e. the target radius of the metal sheet, is gradually formed from the outside inwards into the metal sheet, so that this receives a cross-sectional contour with a continuous radius or a continuous radius progression that is not interrupted by straight sections.
- a constant, identical bending radius is preferably produced from bending step to bending step.
- the method according to the invention has the particular advantage that from step to step the same constant angular range can be formed from outside to inside, so that when the circular cross-sectional profile is produced by means of several rollers in several roller stands arranged one behind the other, identical upper rollers and lower rollers are used a fixed angle setting or can be used with fixed angles of attack. This significantly reduces the number of rollers required with different radii.
- the individual circular arc sections are generated symmetrically in the direction of the center line, starting from the two outer edges extending in the direction of transport of the sheet metal.
- the cross-sectional profile in the form of a circular arc is preferably produced in a continuous passage of the metal sheet through roll stands arranged one behind the other in the preforming section.
- the sheet metal can be fed into the process either endlessly and continuously in the form of strips or discontinuously in the form of individual plates.
- the sheet metal can be unwound from coils and welded to form an endless strip.
- the sheet metal can be pre-bent at both edges or at the outer edges extending in the longitudinal direction with a smaller radius by means of a bending frame. This smaller radius may correspond, for example, to the target radius for deforming the sheet metal into the finished slotted tube in fin-pass mills.
- the individual circular arc sections or profile sequences are preferably produced with the same bending radius.
- the bending radius of the circular arc sections can be selected to be greater than or equal to a desired target radius of the metal sheet.
- the bending radius is determined with regard to a desired target radius with a software-supported springback calculation, preferably on the basis of the diameter, wall thickness and yield point of the metal sheet and taking into account a minimum gap between the rolls, the results from the roll width.
- the metal sheet undergoes a three-point deformation at each bending step from each outer edge symmetrically about the center line.
- a three-point deformation can be accomplished, for example, by using a roller configuration which creates a bending radius inside the circular arc section to be formed with one support and outside the circular arc section to be formed with two supports. This can be done, for example, on each side of the metal strip with a top roll and two bottom rolls.
- At least one radius and/or an angle of attack of at least one roller and/or at least one roller configuration is dependent on a desired target radius a springback calculation and taking into account the height and/or width of the nip.
- the theoretically ideal radius for the rollers to be used in the method according to the invention results from the radius determined in this way.
- the invention can provide that at least one roll is selected from a list with a large number of rolls with different radii in a given gradation depending on the result of the calculation using a computer program.
- the invention proposes a corresponding computer program which, by means of corresponding algorithms and based on maximum permissible edge strains at the edges of the sheet metal, determines the roll configuration of successive bending steps.
- the computer program can iteratively determine the required number of calibers and caliber geometry or the required number of bending steps with the associated roller configurations in order to produce the desired forming flower or the ideal mold required for entry into the fin-pass stands with as few bending steps and rollers as possible Obtain cross-sectional profile of the metal sheet.
- the term roll configuration in the context of the present invention is understood to mean the geometric roll design of a roll stand.
- the computer software can include at least one self-learning algorithm with which the optimal roll configuration is determined.
- FEM Finite Element Method
- certain limit values or boundary conditions for the deformation of the rolling stock are specified from an FEM analysis.
- the object on which the invention is based is further achieved by the provision of a device for preforming metal sheets in the form of strips or plates with a flat cross-sectional profile to form a cross-sectional profile in the shape of a circular arc in a plant for the production of slotted tubes.
- the device is preferably intended and suitable for carrying out the method with one or more of the features described above.
- the device comprises a plurality of roll stands arranged one behind the other to form a preforming stretch, each with a roll configuration which is designed such that the metal sheet is given a bending radius in a plurality of profile sequences, starting from each outer edge, preferably symmetrically to a center line of the preforming stretch.
- the center line of the preform line should ideally correspond to the center line of the sheet metal.
- the device for preforming metal sheets according to the invention can comprise a bending stand.
- At least one roll stand is preferably designed in such a way that the metal sheet is bent with one support on the inside of a circular arc section to be formed and with two supports on the outside of the circular arc section to be formed.
- rollers of rolling stands arranged one behind the other are expediently arranged differently. These can also have the same or different radii and/or different rolled profiles.
- At least one roll stand can have an upper roll, a lower roll and a bending roll on either side of the center line, each of which forms a three-point support.
- a roll stand suitable for carrying out the method can comprise a top roll and a bending roll on both sides of the center line, as well as a single bottom roll extending on both sides of the center line.
- roll stands with different roll configurations of the type described above can be combined in a preforming line.
- the distance and/or the setting angle of the rolls of at least one roll stand can be adjusted in relation to the center line.
- all rolling stands arranged one behind the other have the same configuration with different distances and/or setting angles of the rolls.
- FIG. 1 shows a systematic representation of the forming of a metal sheet into a slotted tube in a tube welding system with a preforming section according to the invention
- FIG. 2 shows a schematic representation of a roll stand for carrying out the roll profiling according to the invention
- FIG. 3 shows a corresponding representation of a second variant of a roll stand for carrying out the roll profiling according to the invention
- FIG. 4 an illustration of a third variant of a roll stand for carrying out the roll profiling according to the invention
- FIG. 5 shows a schematic representation of a fourth variant of such a roll stand
- FIG. 6 shows a schematic representation of various successive bending steps in the method according to the invention
- FIG. 7 shows a schematic representation of different states of deformation of the metal sheet in the form of a so-called preforming flower of the metal sheet and
- FIG. 8 is a schematic representation of a device for forming sheet metal according to the invention with a plurality of roll stands having a roll configuration which corresponds to the variant of the roll stand shown in FIG.
- the representation according to FIG. 1 shows the individual process stages of the forming of a sheet metal 1 in a pipe welding plant.
- the metal sheet 1 is provided, starting from a flat initial cross-section, either in the form of plates or in the form of strips, which are unwound from a coil.
- a strip edge bending stand 2 the metal sheet 1 is first bent at the edges.
- Preforming of the metal sheet 1 then takes place in a preforming section 3, which comprises a multiplicity of roll stands 5 or pre-bending stands.
- the metal sheet 1 is roll-profiled in several successive bending steps to form an almost closed cross-section in the shape of a circular arc.
- the pre-bent metal sheet is formed into a slotted tube 4 in fin-pass stands, which are designed, for example, as knife disk stands.
- the slit tube 4 is welded along the slit extending in the longitudinal direction. The method according to the invention relates essentially to the preforming of the sheet metal 1 in the preforming section 3.
- the preforming section 3 comprises a plurality of rolling stands 5 arranged one behind the other, in which a circular arc-shaped cross-section profile is given to the metal sheet 1 by roll profiling in a number of successive bending steps in a transport direction, the cross-sectional profile being formed by stepwise bending of individual circular arc sections 8 or profile segments, each from an outer edge 6 to a Center line 7 of the metal sheet is generated symmetrically to the center line 7 of the metal sheet 1.
- This procedure can best be explained using the sequence of bending steps a) to e) shown in FIG.
- the bending steps a) to e) are only shown in relation to one side of the metal sheet 1 from an outer edge 6 to the center line 7 both in the sequence according to FIG.
- the bending process is mirror-symmetrical on the non-illustrated side of the metal sheet 1 carried out accordingly and simultaneously.
- the illustration according to Figure 6 shows the complete process of pre-bending in the pre-forming section 3 in five rolling stands 5 arranged one after the other in the direction of transport of the metal sheet in the pre-forming section 3 to a desired, almost closed circular arc-shaped profile cross-section which has a desired target radius with which the metal sheet is formed into the finished slotted tube.
- the number of individual bending steps is not critical for the method according to the invention, but the method according to the invention is carried out in such a way that the number of bending steps and the rollers required for this are minimized.
- the last bending stage or the last bending step is shown in figure e) in FIG.
- the individual circular arc sections 8 are produced, for example, with an upper roller 9, a lower roller 10 and a bending roller 11 on each side of the metal sheet 1.
- the upper rollers 9, the lower roller 10 and the bending roller 11 are arranged relative to one another in such a way that they form a three-point support.
- a total of two upper rolls 9, two lower rolls 10 and two bending rolls 11 are provided, which are arranged, for example, as shown in FIG. 2 and each extend only over a partial width of the metal sheet.
- the upper rollers 9 are each arranged on the inside of the circular arc section 8 to be bent, whereas the lower rollers 10 and the bending rollers 11 are each arranged on the outside of the circular arc section 8 to be bent.
- the top rollers 9 are mounted in a roller stand, not shown, so that they can be displaced horizontally to one another and also vertically.
- the profile of the roll barrel and the radius of the top rolls 9 and the barrel profile of the bending rolls 11 and their Radius essentially define the bending radius of the circular arc section 8 to be formed.
- the distance of an arrangement of upper roller 9, lower roller 10 and bending roller 11 on one side of the center line 7 from an arrangement of upper roller 9, lower roller 10 and bending roller 11 on an opposite side of the center line 7 defines the position of the circular arc section 8 to be formed in relation to the center line 7.
- FIG. 3 of a roll configuration on a roll stand 5 for use in the method according to the invention comprises a single bottom roll 10 instead of two bottom rolls 10, which extends over a substantial part of the width of the roll stand 5 and supports the non-bent area of the metal sheet 1.
- a roll stand 5 with a different roll configuration is shown in FIG.
- the roller configuration shown in Figure 4 corresponds approximately to that shown in Figure 2, with the bending roller 11 having a roller contour which corresponds to that of a conventional lower roller 10 and the bending radius is influenced by the angle of attack of the axis of rotation of the bending roller 11.
- Another possible roller configuration is shown in FIG.
- a three-point support is realized with an upper roll 9 and a combined bending and lower roll 12, which is designed as a Diablo roll with two truncated conical surfaces arranged with the apex of the cone facing one another.
- the roll body of the combined bending and lower roll 12 forms two supports, so that a three-point support with a total of two rolls can be implemented.
- a preform stretch 3 can be realized with roll stands 5, each of which has only 4 relatively narrow rolls.
- FIG. 8 shows a perspective and schematic view of a preforming line 3 using roll stands 5 which have a roll configuration according to the exemplary embodiment shown in FIG.
- FIG. 8 shows a perspective and schematic view of a preforming line 3 using roll stands 5 which have a roll configuration according to the exemplary embodiment shown in FIG.
- an upper roll 9 and a combined bending and lower roll 12 are arranged as a pair of rolls in successive roll stands 5 on both sides of a center line 7, with the distance between the roll pairs provided on both sides of the center line 7 being from one roll stand 5 to the next roll stand 5 from an entry side of the metal sheet 1 to a lead-out side of the metal sheet 1 gradually decreases.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020215091.5A DE102020215091A1 (de) | 2020-12-01 | 2020-12-01 | Verfahren zur Vorformung von Metallblech sowie Computerprogramm und Einrichtung zur Durchführung des Verfahrens |
| PCT/EP2021/080966 WO2022117286A1 (de) | 2020-12-01 | 2021-11-08 | Verfahren zur vorformung von metallblech sowie computerprogramm und einrichtung zur durchführung des verfahrens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4255651A1 true EP4255651A1 (de) | 2023-10-11 |
Family
ID=78649300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21809985.1A Withdrawn EP4255651A1 (de) | 2020-12-01 | 2021-11-08 | Verfahren zur vorformung von metallblech sowie computerprogramm und einrichtung zur durchführung des verfahrens |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20240017314A1 (de) |
| EP (1) | EP4255651A1 (de) |
| JP (1) | JP2023552346A (de) |
| CN (1) | CN116568416A (de) |
| CA (1) | CA3201314A1 (de) |
| DE (1) | DE102020215091A1 (de) |
| WO (1) | WO2022117286A1 (de) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2948324A (en) | 1955-10-18 | 1960-08-09 | Pirelli General Cable Works | Manufacture of tubing and tubular sheathing |
| DE2536125A1 (de) | 1975-08-11 | 1977-02-17 | Mannesmann Ag | Verfahren udn vorrichtung zum einformen von bandmaterial fuer die herstellung von schlitzprofilen |
| DE2605808A1 (de) | 1976-02-12 | 1977-08-18 | Mannesmann Ag | Vorrichtung zum einformen von bandmaterial |
| DE2906692C2 (de) | 1979-02-19 | 1985-02-21 | Mannesmann AG, 4000 Düsseldorf | Verfahren zur Herstellung von Schlitzrohren für eine Rohrschweißmaschine und Vorrichtung zur Durchführung des Verfahrens |
| JPS63286220A (ja) * | 1986-12-23 | 1988-11-22 | Kawasaki Steel Corp | 電縫管の製造方法 |
| JPH06104251B2 (ja) * | 1989-12-06 | 1994-12-21 | 川崎製鉄株式会社 | 溶接鋼管の製造装置 |
| JP2515217B2 (ja) * | 1992-12-24 | 1996-07-10 | 三宅工業株式会社 | ベンデイングロ―ルによる金属材料の曲げ加工方法とその装置 |
| JP2989569B2 (ja) * | 1997-09-01 | 1999-12-13 | 株式会社山陽精機 | 電縫管のブレイクダウン成形法 |
| 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 |
| EP1169149B1 (de) * | 1999-04-05 | 2005-07-27 | Nakata Manufacturing Company Limited | Verfahren und vorrichtung zum rollformen von stahlrohren |
| IT1392055B1 (it) * | 2008-09-18 | 2012-02-09 | Olimpia 80 Srl | Macchina a geometria lineare variabile per la formazione di tubi |
| JP5523579B2 (ja) | 2010-11-04 | 2014-06-18 | 株式会社中田製作所 | 成形方法と成形装置 |
| DE102011016173A1 (de) | 2011-04-05 | 2012-10-11 | Bergrohr Gmbh Siegen | Blechbiegemaschine, Verwendung einer solchen zur Herstellung von Schlitzrohren sowie Verfahren zur Formung eines Bleches zu einem Schlitzrohr |
| JP5361960B2 (ja) * | 2011-08-24 | 2013-12-04 | 株式会社中田製作所 | ロール成形方法 |
-
2020
- 2020-12-01 DE DE102020215091.5A patent/DE102020215091A1/de not_active Withdrawn
-
2021
- 2021-11-08 CN CN202180080559.8A patent/CN116568416A/zh active Pending
- 2021-11-08 US US18/039,371 patent/US20240017314A1/en not_active Abandoned
- 2021-11-08 JP JP2023533317A patent/JP2023552346A/ja active Pending
- 2021-11-08 CA CA3201314A patent/CA3201314A1/en active Pending
- 2021-11-08 WO PCT/EP2021/080966 patent/WO2022117286A1/de not_active Ceased
- 2021-11-08 EP EP21809985.1A patent/EP4255651A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US20240017314A1 (en) | 2024-01-18 |
| DE102020215091A1 (de) | 2022-06-02 |
| JP2023552346A (ja) | 2023-12-15 |
| CA3201314A1 (en) | 2022-06-09 |
| CN116568416A (zh) | 2023-08-08 |
| WO2022117286A1 (de) | 2022-06-09 |
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