EP2900395A1 - Procédé de pliage d'une pièce - Google Patents

Procédé de pliage d'une pièce

Info

Publication number
EP2900395A1
EP2900395A1 EP13802850.1A EP13802850A EP2900395A1 EP 2900395 A1 EP2900395 A1 EP 2900395A1 EP 13802850 A EP13802850 A EP 13802850A EP 2900395 A1 EP2900395 A1 EP 2900395A1
Authority
EP
European Patent Office
Prior art keywords
heating
workpiece
zone
energy input
temperature
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
EP13802850.1A
Other languages
German (de)
English (en)
Other versions
EP2900395B1 (fr
Inventor
Gerhard Sperrer
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.)
Trumpf Maschinen Austria GmbH and Co KG
Original Assignee
Trumpf Maschinen Austria GmbH and Co KG
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 Trumpf Maschinen Austria GmbH and Co KG filed Critical Trumpf Maschinen Austria GmbH and Co KG
Publication of EP2900395A1 publication Critical patent/EP2900395A1/fr
Application granted granted Critical
Publication of EP2900395B1 publication Critical patent/EP2900395B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • B21D5/008—Bending sheet metal along straight lines, e.g. to form simple curves combined with heating or cooling of the bends
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • B21D5/002—Positioning devices
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0281—Workpiece supporting devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a localised treatment

Definitions

  • the invention relates to a method for folding workpieces made of sheet metal, wherein before and / or during the bending process, a bending strip containing, in particular strip-shaped forming on the workpiece to locally increase the formability is heated to a forming temperature below the melting temperature of the metal.
  • a bending strip containing, in particular strip-shaped forming on the workpiece to locally increase the formability is heated to a forming temperature below the melting temperature of the metal.
  • brittle materials such as magnesium, titanium, spring steels, high-strength Al alloys, high-strength steels or other known as brittle materials
  • breaking elongation ie the value of the plastic deformation that a work piece to be reshaped can endure up to the occurrence of a break.
  • yield ratio which sets the required tension in a workpiece at the beginning of a noticeable plastic deformation in relation to the maximum tolerable stress at break load from the workpiece.
  • the formability can be too low if bending radii are to be produced which are very small in relation to the sheet thickness, e.g. if the bending radius lies approximately in the area of the sheet metal thickness or is even smaller, as a result of which the tolerable material stress can be exceeded on the tension side of the forming zone.
  • EP 0 993 345 A1 discloses a method for bending a workpiece by mechanical force under selective heating of the workpiece along a bending line by laser radiation, in which an elongate radiation field is formed from one or more laser beams and through which Radiation field the workpiece is heated at all points along the bending line.
  • the object of the invention is to provide a generic bending method which avoids or at least reduces the mentioned adverse effects of heating the forming zone.
  • the object of the invention is achieved by a method according to claim 1.
  • the fact that the workpiece is heated before and / or during and / or after the bending process in at least one of the forming zone different heating zone by energy input from outside the workpiece, starting from an initial temperature to a treatment temperature below the melting temperature of the metal, which can be at a Distribution of the shrinkage stresses occurring alone heating the forming zone are influenced in such a way that gentler voltage curves result and the shrinkage stresses occurring are at least partially compensated.
  • the cooling of the forming zone can thereby be slowed down in a simple manner, since the outflow of heat from the forming zone is due to the increased temperature of the adjacent heating zone. ne is reduced and the propagation of internal stresses in the bending edge of the workpiece adjacent to the produced bending edge can be reduced.
  • a mathematical estimation of the thermal stresses resulting from the temperature changes on the workpiece and deformations caused thereby is achieved by means of constantly improved simulation calculations, e.g. FE methods, feasible and it is also possible based on computational models and possibly also inclusion of measurements during the process application before and / or during and / or after the actual forming process by need-based energy input to produce a temperature distribution in the workpiece, with the unwanted, after the cooling process remaining deformations can be reduced or eliminated.
  • simulation calculations e.g. FE methods
  • An advantageous method for the energy input into the heating zone can be selected from a group comprising heat transfer, heat conduction, heat radiation, convection, electromagnetic induction, electrical resistance heating, laser radiation, high-energy electromagnetic radiation, or a combination.
  • the use of laser radiation allows a rapid and precise increase in temperature in the heating zone, since the radiation emitted by a laser light source is flexibly adaptable in its intensity and by suitable means for beam guidance in its point of action.
  • the energy input into the heating zone can be carried out at a distance from the forming zone, whereby more options are available through a greater distance in the choice of the means used for the energy input. This facilitates simultaneous heating of the forming zone and the heating zone.
  • the treatment temperature has a predetermined temperature distribution with different temperature values.
  • the energy input may advantageously be from both sides of the sheet. In particular, with thicker sheets so can be saved heating time. By the energy input from both sides of the sheet is available for more area and can be increased at the same held intensity of the energy input, the heating power. The risk of local overheating up to reaching the melting temperature of the sheet can be kept low.
  • a simple and optionally calculable or definable temperature distribution in the workpiece can be effected if the heating zone is set oriented parallel to the bending edge or forming zone.
  • Treatment temperature within the heating zone is not required to make the energy input uniformly throughout the heating zone, but it is also possible to carry out the energy input into the heating zone in several spaced apart heating sab sections. This allows the use of one or more locally acting heat sources to heat the heating zone rather than using a full-surface heat source. For example, it can be replaced by a controllable laser beam a surface-adjacent resistance heating.
  • the heating sections are set substantially uniformly distributed within the heating zone. This not only includes the spatial distribution and expansion, but may also provide a largely identical energy input into the heating sections.
  • a simple and possibly mathematically plannable or definable temperature distribution in the workpiece can be effected if the energy input in at least one heating section is performed essentially along a line or alternatively at one point.
  • a uniform temperature distribution and a well predictable or calculable temporal temperature profile are achieved if, within the heating zone, the energy input occurs simultaneously in all heating sections of the heating zone. Any calculation models used to determine the energy input can be simplified as a result.
  • the energy input can be made successively in time in individual heating sections, whereby a planar heating zone can be heated with a spatially locally acting energy source.
  • a planar heating zone can be heated with a spatially locally acting energy source.
  • the heating of the forming zone to the forming temperature can further be done by means of energy input into the heating zone and thereby effected heat conduction within the workpiece, if thereby the required forming temperature is achieved, whereby a separate heating device for the forming zone can be omitted.
  • the energy source used for the heating of the forming zone offset in time and for the energy input into the heating zone Since there are comparable requirements when heating the forming zone and the heating zone, this can be used in many cases.
  • At least one process parameter selected from a group including location, shape, extent, treatment temperature or temperature distribution of the heating zone, distribution, duration or intensity of energy input by means of a programmable controller device .
  • models for the cooling behavior and the associated thermal stresses or thermally induced deformations are stored in the control device, which are adapted to the respective application.
  • a process parameter may be determined using a finite element method.
  • a further development of the method can be to determine the process parameters after measuring the geometry and / or the temperature of the workpiece before and / or during and / or after the forming process, whereby the process results can be optimized by returning controlled variables. The process is thus so controlled that unwanted thermally induced deformations after cooling of the workpiece are minimized.
  • An effective minimization of shape errors on the workpiece can be achieved if the intensity and the duration of the energy input is selected so that in the heating zone and / or the heating sections a treatment temperature in a range between 220 ° C and 600 ° C substantially over the entire Thickness of the sheet is reached.
  • the intensity and the duration of the energy input in such a way that in the heating zone and / or the heating sections a treatment temperature is reached at which a microstructural change of the sheet is effected in relation to the starting temperature.
  • Such structural changes may affect the stress distribution within the workpiece such that the absolute values of the shape errors on the workpiece are reduced. For example, it can be caused by several inhomogeneities of the structure in the sheet that due to the shrinkage stresses not a large warp on the workpiece is formed, but form several smaller faults or sets a slight ripple, which represent tolerable errors if necessary.
  • a particularly rational implementation of the method is possible if at least part of the energy input into the heating zone takes place by means of a bending tool involved in the bending process.
  • a bending tool involved in the bending process For example, it may be provided that in a bending die, on which the workpiece is placed before the forming process, a possibility for discharging high-energy radiation, in particular laser radiation is provided and the workpiece is positioned by means of a robot on the exiting radiation, that the intended heating in the forming zone and / or the heating zone takes place.
  • the energy input into the heating zone takes place in a cutting process upstream of the bending process on the laser cutting machine.
  • the application of the method is particularly advantageous for bending workpieces made of zinc-based, titanium-based, aluminum-based metal sheets, as well as composite materials with such components or for workpieces in which the ratio of the smallest bending radius and sheet thickness is less than or equal to 1.0.
  • Fig. 1 A method for folding of workpieces during the heating of the forming zone and the heating zone;
  • Fig. 2 A method for folding of workpieces at the completion of the forming process
  • Fig. 3 is a partially sectioned view in the direction III of a finished bent workpiece in Fig. 2;
  • FIG. 5 shows a representation of a possible temperature distribution within a workpiece to be formed after heating of the heating zone
  • Fig. 6 shows a section through a usable in the application of the method bending die.
  • a method described in consequence for bending a workpiece 1 is shown from a metal sheet.
  • a workpiece 1 is introduced into a bending tool arrangement 2 prior to the forming process, which comprises a bending die 3, for example in the form of a V-die, and a bending punch 4, which by means of a non-illustrated Asked guide and drive assembly of a bending machine are movable relative to each other and thereby produce a bending edge 5 on the workpiece 1 by plastic deformation.
  • a forming zone 6 containing the subsequent bending edge 5 is heated by means of a heating device 7 to a forming temperature below the melting temperature of the metal of the workpiece 1.
  • forming steps can be achieved on the workpiece 1 which would not be possible, for example, at room temperature, since the workpiece 1 would possibly break or break.
  • the voltage from which a plastic deformation begins in the workpiece 1 reduced, which is why the optimum forming temperature is determined depending on the material used of the workpiece 1.
  • the application of the method is particularly advantageous for zinc-based, titanium-based, aluminum-based metal sheets, or for workpieces in which the ratio of the smallest bending radius and sheet thickness is less than or equal to 1.0.
  • the heating device 7 causes an energy input into the forming zone 6 of the workpiece and may use a mechanism selected from a group comprising heat transfer, heat conduction, heat radiation, convection, electromagnetic induction, electrical resistance heating, laser radiation, high-energy electromagnetic radiation or a combination thereof.
  • FIG. 1 shows that the heating device 7 and the later bending edge 5 are positioned in the bending plane 8, which also coincides with the direction of movement of the adjustable bending punch 4.
  • the heater 7 is removed from the immediate work area of the bending tool assembly 2 and the workpiece 1 is placed in the intended for the forming process position. Normally, it is placed on the top 9 of the bending die 3, which also represents a support plane 10.
  • the heating of the forming zone 6 is performed distanced from the bending tool assembly 2 and the workpiece 1 is spent in a short path in the required position for the forming process, in which the subsequent bending edge 5 is in the bending plane 8.
  • the heating of the deformation zone 6 is carried out so that the workpiece 1, even after a short positioning the desired increased Um- moldability is given.
  • the cooling process occurring after the end of the heating can be estimated and the deformation zone 6 can be heated to a correspondingly higher temperature.
  • at least one heating zone 11 is heated on the workpiece 1 in addition to the forming zone 6 by means of energy input from outside the workpiece 1, starting from an initial temperature to a treatment temperature below the melting temperature of the workpiece 1.
  • two, with respect to the bending plane 8 approximately symmetrical lying heating zones 11 are heated.
  • the energy input takes place here by heating devices 12, which are arranged adjacent to the heating device 7 for the forming zone 5 and also act on the underside of the workpiece 1, but it is also possible that are positioned by further heaters 12, which are positioned above the workpiece 1, the Heating zones 11 are heated simultaneously from both sides of the workpiece to the treatment temperature.
  • the energy input takes place in this case from both sides of the workpiece 1 and thereby also the time for the heating process can be reduced.
  • the heating devices 12 for heating the heating zones 11 can also be arranged at a distance from the bending tool arrangement 2 and the workpiece 1 can be brought into the position required for the forming process after heating has taken place.
  • a source of high-energy radiation in particular laser radiation
  • the heating of the heating zones 11 can also take place in such a way that, with a time offset, the heating device 7 used for heating the deformation zone 6 is used. In this case, the construction work for the implementation of the method is reduced.
  • the heaters 7, 12 are preferably controlled by a programmable controller 13, with which the heating operations are controlled so that the required temperatures, ie the forming temperature in the forming zone 6 and the treatment temperature in the heating zone 11 are achieved or maintained as accurately as possible.
  • the control device 13 may also be connected to a control device, not shown, of the bending machine containing the bending train 2 or be part of such.
  • the energy input into the heating zone 11 is activated with the control device 13 and thereby selected from a group comprising the position, shape, extent or treatment temperature of the heating zone or also the distribution, duration and intensity of the energy input.
  • the control device 13 can also influence the energy input into the heating zone 11 by automatically adjusting the position of the heating devices 7, 12, and this automatic adjustment can additionally include the removal of the heating devices 7, 12 from the working area of the bending tool arrangement 2 ,
  • the determination of the process parameters by the control device 13 can in particular also be carried out using a finite element method, with which the resulting in the heating and cooling of the workpiece 1 in the forming zone 6 voltages are estimated or calculated in advance and based on the Energy input into the heating zones 11 is set so that the occurring during the cooling of the workpiece 1 after the forming process stresses in the workpiece are minimized or compensated.
  • the determination of process parameters also takes place based on a measurement of the geometry of the workpiece 1 or the temperature of the workpiece 1 in the forming zone 6 or in the heating zone 11.
  • the heating process can take place with a temperature measuring device activated during the heating process, for example a non-contact radiation thermometer, and a control device. So that in the forming the required for the unproblematic execution of a bending process formability of the workpiece 1 is given, a certain temperature is required at the end of the heating in the forming zone 6, taking into account that due to heat conduction within the workpiece 1 and heat dissipation the environment the temperature in the forming zone 6 drops. Therefore, it is advantageous if the shortest possible time elapses between the completion of the heating process and the completion of the forming process, which is why an implementation of the heating process in the vicinity of the bending tool assembly or within the bending tool assembly 2 is advantageous.
  • An embodiment of the method can also be that the heating of the forming zone 6 takes place on the forming temperature by heat conduction during or after the effected by the heater 12 energy input into the heating zone 11.
  • a separate heating device 7 for heating the forming zone 6 omitted.
  • the intensity and the duration of the energy input by means of the heaters 7, 12 are selected so that in the heating zone 11, a treatment temperature is achieved in a range between 220 ° C and 600 ° C. This temperature should prevail over substantially the entire thickness of the workpiece 1.
  • Fig. 2 the action of the bending tool assembly 2 is shown on the workpiece 1, in which case, for example, the completion of the forming process is shown.
  • the forming zone 6 has a relation to non-heated parts of the workpiece 1 increased temperature and continues as a result of the temperature compensation within the workpiece 1 and the heat output to the environment or the bending tool assembly 2 on.
  • this cooling process is advantageously influenced by the heating zones 11 different from the forming zone 6, wherein the heating of the heating zone 11 can take place before and / or during and / or after the actual forming process.
  • Fig. 3 shows a view according to the direction III of a folded workpiece 1, wherein the right bending leg in Fig. 2 is shown in section along line A-A.
  • the strip-shaped forming zone 6 and the local increase in the temperature of the material undergoes a thermal expansion in this area, but which is more or less hindered by the adjacent, less strongly or not heated workpiece sections.
  • compressive stresses occur in the region of the deformation zone 6, resulting in a subsequent cooling of the workpiece 1 and associated therewith
  • FIG. 4 possible temperature distributions within a workpiece 1 are shown when carrying out the method.
  • T in the region of the later bending edge 5 containing forming zone 6 is a region with greatly elevated temperature T, since the workpiece 1 is heated before or during the forming process here on the relation to the ambient temperature significantly higher, already described above forming temperature.
  • this relatively narrow and pointed temperature profile 17 in the forming zone 6 widens as a result of the heat conduction taking place in the workpiece 1 after the end of the heating process.
  • a significantly elevated temperature which cause the previously described shrinkage stresses and related undesirable changes in shape of the finished workpiece 1.
  • the work piece 1 is heated to a treatment temperature below the melting temperature of the metal on the workpiece 1 in addition to the forming zone 6 in a heating zone 11 -in FIG. 4, two heating zones 11 symmetrically to the bending edge 5, whereby each isolated further temperature distributions 18 result to change the cooling behavior of the workpiece 1 as a result.
  • This additional increase in temperature in the heating zones 11 causes the forming zone 6 to cool much more slowly after reaching the forming temperature and, as a result, the rapid heat flow into the remaining workpiece 1 is substantially reduced.
  • the original without any heating zones 11 original temperature distribution 17 is replaced in this case by a much wider temperature distribution 19, which due to the much lower temperature gradient and due to much lower cooling rate, the internal stresses due to the cooling process are much lower and thereby significantly lower undesirable thermal deformations occur on the curved workpiece 1.
  • FIG. 4 it is indicated that the forming temperature 20 in the forming zone 6 is chosen to be much higher than the treatment temperature 21 in the heating zones 11, but it is also possible that treatment temperature 21 and forming temperature 20 are about the same or that the treatment temperature 21st is greater than the forming temperature 20.
  • the forming zone 6 is not specially heated, but is brought by heat conduction within the workpiece 1, starting from the heating zones 11 to the appropriate forming temperature.
  • FIG. 5 shows possible embodiments of heating zones 11 on a view of an unbent workpiece 1. In the region of the bending plane 8, the forming zone 6 containing the later bending edge 5 is identified by dashed lines.
  • a heating zone 11 is shown, in which the energy input takes place by means of two heating sections 22 which are distanced from one another. Accordingly, the energy input need not occur uniformly or over the entire heating zone 11, but due to the already occurring heat conduction and distribution of the temperature after completion of the heating process, the heating at a plurality of spaced apart heating sections 22 done.
  • the energy input in the heating sections 22 takes place along lines 23 which extend approximately parallel to the bending plane 8, as a result of which the heating zone 11 also extends approximately parallel to the bending edge 5.
  • a modified second heating zone 11 is shown, in which the heating sections 22 are formed by a series of points 24 in which substantially the energy input takes place.
  • FIG. 6 shows a further embodiment of the method for folding a workpiece 1, which is possibly independent of itself, wherein the same reference numerals or component designations are again used for the same parts as in the preceding FIGS. 1 to 5. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figs. 1 to 5 or reference.
  • the heating of the subsequent bending edge 5 containing forming zone 6 and the mutually arranged heating zones 11 by means of a bending die 3 integrated heater 7, preferably a laser light source 25 or means for distributing generated outside of the bending die 3 and introduced into this laser radiation includes.
  • the positioning and handling of the workpiece is done manually or as shown by means of a programmable handling device 26, which is equipped with gripping tongs 27, for example.
  • a programmable handling device 26 which is equipped with gripping tongs 27, for example.
  • the bottom of the workpiece 1 rests against the support surface 10 of the bending die 3, a deformation due to the dead weight of the workpiece 1 is reduced while a potentially dangerous leakage of laser radiation is largely prevented.
  • the forming zone 6 and the two heating zones 11 are heated sequentially in time with the same heating device 7, wherein the order can be chosen freely.
  • the forming zone 6 is heated only after the heating zones 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

L'invention concerne un procédé de pliage d'une pièce (1) en tôle métallique. Avant et/ou pendant l'opération de pliage, une zone de façonnage (6), notamment en forme de bande, contenant l'arête de pliage (5) à produire est chauffée à une température de façonnage inférieure à la température de fusion du métal afin d'augmenter localement la déformabilité. Pour réduire les déformations indésirables résultant des contraintes de retrait, la pièce (1) est chauffée à partir d'une température initiale jusqu'à une température de traitement inférieure à la température de fusion du métal dans au moins une zone de chauffage (11) différente de la zone de façonnage (6) par un apport d'énergie depuis l'extérieur, avant et/ou pendant et/ou après l'opération de pliage.
EP13802850.1A 2012-09-26 2013-09-25 Procédé de pliage d'une pièce Active EP2900395B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1051/2012A AT513467B1 (de) 2012-09-26 2012-09-26 Verfahren zum Biegen eines Werkstücks
PCT/AT2013/050195 WO2014047669A1 (fr) 2012-09-26 2013-09-25 Procédé de pliage d'une pièce

Publications (2)

Publication Number Publication Date
EP2900395A1 true EP2900395A1 (fr) 2015-08-05
EP2900395B1 EP2900395B1 (fr) 2017-04-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13802850.1A Active EP2900395B1 (fr) 2012-09-26 2013-09-25 Procédé de pliage d'une pièce

Country Status (5)

Country Link
US (1) US9707608B2 (fr)
EP (1) EP2900395B1 (fr)
JP (1) JP6367808B2 (fr)
AT (1) AT513467B1 (fr)
WO (1) WO2014047669A1 (fr)

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CN107649548A (zh) * 2017-08-22 2018-02-02 马鞍山市恒建机械有限公司 一种发动机带有温控保护功能的数控折弯机及发动机温控方法
CN113145695B (zh) * 2021-03-09 2022-07-26 陕西凯盛航空装备制造有限公司 一种便于维护的航空零部件生产用弯曲装置
CN113579024B (zh) * 2021-06-30 2024-02-09 北京卫星制造厂有限公司 一种基于激光诱导的氨轴向槽道热管弯曲成形的方法
DE102021122724B3 (de) * 2021-09-02 2023-01-19 Audi Aktiengesellschaft Leistungselektronische Schaltung und Verfahren zu deren Herstellung
CN117564430B (zh) * 2024-01-15 2024-04-02 中国核动力研究设计院 曲面工件扩散焊接的加压组件、设备及焊接方法

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US9707608B2 (en) 2017-07-18
US20150266073A1 (en) 2015-09-24
AT513467A1 (de) 2014-04-15
WO2014047669A1 (fr) 2014-04-03
EP2900395B1 (fr) 2017-04-05
JP2015530254A (ja) 2015-10-15
JP6367808B2 (ja) 2018-08-01

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