EP0474625A2 - Procédé pour dresser en particulier des feuillards sans fin - Google Patents

Procédé pour dresser en particulier des feuillards sans fin Download PDF

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Publication number
EP0474625A2
EP0474625A2 EP91890196A EP91890196A EP0474625A2 EP 0474625 A2 EP0474625 A2 EP 0474625A2 EP 91890196 A EP91890196 A EP 91890196A EP 91890196 A EP91890196 A EP 91890196A EP 0474625 A2 EP0474625 A2 EP 0474625A2
Authority
EP
European Patent Office
Prior art keywords
belt
pulses
production
particles
straightening
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.)
Granted
Application number
EP91890196A
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German (de)
English (en)
Other versions
EP0474625B1 (fr
EP0474625A3 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Berndorf Band GmbH
Original Assignee
Berndorf Band GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Berndorf Band GmbH filed Critical Berndorf Band GmbH
Publication of EP0474625A2 publication Critical patent/EP0474625A2/fr
Publication of EP0474625A3 publication Critical patent/EP0474625A3/de
Application granted granted Critical
Publication of EP0474625B1 publication Critical patent/EP0474625B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • 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
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming

Definitions

  • the invention relates to a method for straightening, in particular endless, metallic strips for production plants, for. B. belt presses, double belt presses.
  • Metals have the properties that they deform plastoelastically under the action of force. This property is used for the most diverse shaping processes.
  • a widely used process is the so-called deep drawing, in which a sheet is quickly deformed by a stamp into a mold.
  • Another shape is that, for example, the force is not applied mechanically, but by a detonation, and the sheet is pressed into a shape arranged below it.
  • Another method is that, for. B. a piece of pipe is stretched by the action of a hydraulic fluid in a form so that an expansion of the cross section is carried out at predetermined locations.
  • Another shaping method which is described, for example, in DE-29 06 509 A1 and DE-32 13 896 A1, consists in shaping areas of a sheet to be deformed by shot peening, with residual compressive stresses being applied to the surface of the sheet to be deformed and the sheet bulges against the direction of shot peening.
  • Such methods can be used to free-form sheet metal and are particularly suitable for deforming difficult-to-shape materials, such as titanium.
  • the present invention aims to provide a method for straightening, in particular endless, to create metallic strips for production plants or the like, which requires a targeted application of force with the least elastic deformation, a straightening of the sheet without complex abutments below it, and the tensile forces, especially in the surface layers, are kept as low as possible.
  • the inventive method for straightening in particular endless, metallic strips for production plants or the like.
  • B. belt presses double belt presses, the areas to be straightened are determined and these are subjected to forces via a device, a relative movement being carried out between the belt and the force-exerting device, consists essentially in the fact that the forces are in the form of a large number of Attack pulses, in particular at least 1 to 10 pulses per mm2, on the surface and cause residual compressive stresses in the exposed surface. Due to the known relative movement between the band to be straightened and the device exerting the forces, the force exerted in the longitudinal direction can be carried out in a particularly simple manner, particularly with uniform warping of the bands.
  • the elastic deformation can be kept particularly low during straightening, the internal compressive stresses applied in the surface layer being able to achieve a balance of forces within the sheet and at the same time the advantage What is achieved is that, for example, the corrosion behavior, in particular the stress corrosion cracking behavior, is significantly improved. Contrary to the usual procedure, when Internal compressive stresses over a large number of pulses cause the sheet to deform against the direction of the force.
  • a fluid flow with solid, in particular round, particles e.g. B. glass or steel balls, for example with a diameter of 200 microns to 400 microns
  • a conventional method can be used, the so-called shot peening being present with a gas stream, whereas additional treatments of the surface, for example in the case of a liquid stream or a vaporous medium of the sheet are possible.
  • Such a fluid flow can be made particularly variable simply by changing the outlet opening in its impact surface, as a result of which an adaptation to the size of the sheet and to the deformations that usually occur can be carried out particularly easily.
  • the impulses are applied to the surface via silent electrical discharges, another method known in the art for introducing residual compressive stresses is used, this method being particularly advantageous for small changes in the surface with higher melting alloys.
  • the size of the pulse can be kept variable both via the current strength and via the voltage and, if appropriate, via the design of the electrode.
  • shot peening can also be carried out even in rooms with increased cleanliness requirements, with the pulses also being controlled in the interaction between the pressure of the fluid, which Particles are transported and the suction pressure is enabled.
  • the particles are suctioned off essentially in a ring around the point where the particles are applied, then an exact positioning of the particles on the surface is possible, whereby the reflected particles, which are simultaneously deflected by the fluid, get around the beam in a particularly simple and effective manner can be.
  • the parameters of the device for exerting the pulses can be kept constant and it is only necessary for either the device or the belt in the speed of the relative movement to change each other.
  • the circulation speed and the belt tension corresponds to the operating conditions during the production of products with the production system, so either an alignment of the belts Take place under production conditions, or what is also of particular importance, the straightening of the belts can be carried out during the normal production process, so that no downtimes, as are caused, for example, when turning the endless belts, are caused.
  • the substantially uniform deformation in a longitudinal direction is particularly easily taken into account when straightening the strip, so that a continuous tension compensation, as it is particularly advantageous for straightening work, is simple and reliable to carry out.
  • the endless belt is returned to the production area, e.g. B. the shaping of webs, impulses, so there is the least disruption during production, while no constructive changes to the press, z. B. double belt press, like other inlet or outlet area, is required.
  • the double belt press for the production of chipboard according to FIGS. 1 and 2 has a machine bed 1, in which an upper endless belt 2 by the deflecting rollers 6 and 6 'and a lower endless belt 3 by the deflecting rollers 7 and 7' tensioned and are kept in circulation in the same sense.
  • the band has a width of 2.5 m and a length of 45 m.
  • the circulating speed is 6.0 m / min.
  • the tensile stress exerted on the strips is 10 N / mm2.
  • the strips are made of a stainless steel alloy with the following composition:
  • both the upper band 2 and the lower band 3 are supported by rollers 25 in the production position and by rollers 26 in the return position.
  • Shot peening systems 4 and 5 are arranged in the area of the return.
  • a bearing 10 is arranged on L-shaped supports 23 in the machine tunnel 8 of the foundation 9, to which a linear unit 11 is attached.
  • This carries a carrier 12, on which two jet heads 13 are arranged so that they can be swiveled and moved transversely to the longitudinal direction of the double belt press.
  • the lower shot blasting system is arranged in the direct connection to the deflection roller 7.
  • the upper shot peening system 4 is further away from the deflection roller 6 and is arranged between two rollers 26.
  • the blasting head 13 is fastened to the linear unit 15 via the receptacle 16, which in turn is connected to the machine bed 1 via C-shaped supports 14.
  • the jet head above the upper band 2 has the same mobility as that of the lower band.
  • the jet heads 13 are supplied with the solid particles and also with the carrier gas via supply lines 21 from the jet device 18. Glass spheres with a diameter of 300 ⁇ m serve as solid particles, and the glass spheres are thrown against the surface of the steel strip by the fluid at a speed of 150 m / sec.
  • the impact area of the jet on the belts which is circular, has a diameter of 12 mm, and the jet head is designed as a suction jet head and has an annular suction, through which suction is carried out with a negative pressure relative to the atmospheric pressure of 0.1 bar, in line 21 a corresponding suction line with a larger volume than that of the supply line is provided.
  • the transverse movement of the jet heads can be carried out by servomotors 24.
  • a C-shaped carrier 19 is attached to the carrier 20 and supports the linear unit 11.
  • the carriage 22 has a carrier 12 which supports the jet head 13, which is height-adjustable both in direction a and laterally adjustable in direction b.
  • the jet head is also rotatably and pivotably arranged. The movement of the jet head transversely to the longitudinal extent of the belt is carried out with the servo motor 24.
  • a ruler with a cross-section is arranged, with which the deviation from the linearity is determined.
  • the linearity can be determined both mechanically and optically, e.g. B. about interference, depending on what accuracy is required for the measurement.
  • a band 3 is shown in cross section, which is already strongly deformed and no longer comes to rest on the rollers in the central region.
  • the individual paths of exposure to the particles during shot peening were arranged side by side.
  • a flat alignment of the endless belt could be achieved by the residual compressive stresses introduced into the surface in this way.
  • the procedure according to the invention is particularly suitable for materials which tend to build up residual compressive stresses by cold forming, such as steel alloys, duralumin alloys and the like.
  • the impulses can also be carried out, for example, by pneumatically or mechanically operated hammers, the mass of the hammer, the speed and the size of the impact surface being decisive for the impulse.
  • the size of the impulses can be determined by selecting the voltage and current strength and the size of the electrode tip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Processing Of Meat And Fish (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Belt Conveyors (AREA)
EP91890196A 1990-09-06 1991-09-02 Procédé pour dresser en particulier des feuillards sans fin Expired - Lifetime EP0474625B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT182490 1990-09-06
AT1824/90 1990-09-06

Publications (3)

Publication Number Publication Date
EP0474625A2 true EP0474625A2 (fr) 1992-03-11
EP0474625A3 EP0474625A3 (en) 1992-05-20
EP0474625B1 EP0474625B1 (fr) 1994-11-09

Family

ID=3521791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91890196A Expired - Lifetime EP0474625B1 (fr) 1990-09-06 1991-09-02 Procédé pour dresser en particulier des feuillards sans fin

Country Status (3)

Country Link
EP (1) EP0474625B1 (fr)
AT (1) ATE113877T1 (fr)
DE (1) DE59103482D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105615C1 (fr) * 1991-02-22 1992-03-26 Eduard Kuesters Maschinenfabrik Gmbh & Co Kg, 4150 Krefeld, De
WO2000067928A3 (fr) * 1999-05-07 2001-03-01 Berndorf Band Gmbh Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques
WO2011066126A1 (fr) * 2009-11-25 2011-06-03 Corning Incorporated Procédé de fabrication de structures métalliques réfractaires résistant au fluage
AT524459A1 (de) * 2020-11-27 2022-06-15 Berndorf Band Gmbh Metallbandfertigung durch Schleifen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701408A (en) * 1951-11-19 1955-02-08 Lockheed Aircraft Corp Method of cold forming sheets
DE2063100A1 (en) * 1970-12-14 1972-06-29 Avco Corp., Cincinnati, Ohio (V.St.A.) Forming metal sheets by peening - using large diameter free-falling hardened steel balls at low velocity
DE2452435C2 (de) * 1974-11-05 1983-10-20 Fritz Müller Pressenfabrik, 7300 Esslingen Verfahren zum abschnittsweisen Richten eines rotationssymmetrischen Werkstücks
CH625433A5 (fr) * 1977-10-11 1981-09-30 Marcel Wahli
DE2906509A1 (de) * 1979-02-20 1980-08-28 Kopp Reiner Verfahren zur formgebung mit einem auf eine seite eines gegenstandes zur einwirkung gelangenden stoffstrahl
DE3213896A1 (de) * 1982-04-15 1983-10-20 Dornier Gmbh, 7990 Friedrichshafen Verfahren und einrichtung zur umformung von plattenfoermigen werkstuecken

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105615C1 (fr) * 1991-02-22 1992-03-26 Eduard Kuesters Maschinenfabrik Gmbh & Co Kg, 4150 Krefeld, De
US5224367A (en) * 1991-02-22 1993-07-06 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method for the treatment of the steel belts of a double belt press
WO2000067928A3 (fr) * 1999-05-07 2001-03-01 Berndorf Band Gmbh Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques
WO2011066126A1 (fr) * 2009-11-25 2011-06-03 Corning Incorporated Procédé de fabrication de structures métalliques réfractaires résistant au fluage
AT524459A1 (de) * 2020-11-27 2022-06-15 Berndorf Band Gmbh Metallbandfertigung durch Schleifen
AT524459B1 (de) * 2020-11-27 2023-01-15 Berndorf Band Gmbh Metallbandfertigung durch Schleifen

Also Published As

Publication number Publication date
EP0474625B1 (fr) 1994-11-09
EP0474625A3 (en) 1992-05-20
ATE113877T1 (de) 1994-11-15
DE59103482D1 (de) 1994-12-15

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