EP2540405A2 - Procédé et dispositif de fabrication de platines de différentes épaisseurs - Google Patents

Procédé et dispositif de fabrication de platines de différentes épaisseurs Download PDF

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Publication number
EP2540405A2
EP2540405A2 EP12173868A EP12173868A EP2540405A2 EP 2540405 A2 EP2540405 A2 EP 2540405A2 EP 12173868 A EP12173868 A EP 12173868A EP 12173868 A EP12173868 A EP 12173868A EP 2540405 A2 EP2540405 A2 EP 2540405A2
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EP
European Patent Office
Prior art keywords
temperature
boards
rolling
board
different
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
EP12173868A
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German (de)
English (en)
Other versions
EP2540405A3 (fr
EP2540405B1 (fr
Inventor
Andreas Dr. Hauger
Andreas Elvenkemper
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Muhr und Bender KG
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Muhr und Bender KG
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Publication date
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Publication of EP2540405A2 publication Critical patent/EP2540405A2/fr
Publication of EP2540405A3 publication Critical patent/EP2540405A3/fr
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Publication of EP2540405B1 publication Critical patent/EP2540405B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions

Definitions

  • the invention relates to a method for producing boards, which have different thicknesses over their length.
  • a method and an apparatus for producing a metal strip are known.
  • the different thickness regions of the strip are produced by hot rolling by sectioning the strip prior to hot rolling by cooling or heating to a different temperature.
  • the band undergoes a different thickness decrease in the individual sections, which have received a different yield stress value due to the different temperature setting, with a substantially constant rolling force.
  • a hydraulic delivery is provided, which moves the nip during rolling.
  • a disadvantage of the methods used today is the high cost of heating the coils and the complexity of the rolling stands for rolling the partially differently heated coils or boards to partially different thicknesses.
  • the present invention has for its object to propose a simplified method for the production of boards with different thicknesses, which allows a targeted regional heating of boards and a blading of the boards by means of a simple and inexpensive rolling mill on different thicknesses.
  • the advantage of the method with the specified sequence of the individual method steps is that different temperature zones are generated by the regional variation of the temperature. Due to the different temperature zones, the different areas of the boards have different flow resistance. In this case, hotter areas have a lower flow resistance and are therefore more severed than colder areas of the board. Due to the different flow resistances, sections of different thickness are produced on the board by the subsequent rolling. In this case, the areas heated higher before rolling have a smaller thickness after rolling than the lower heated areas. Overall, with the method according to the invention, by appropriately setting the temperature zones of the blank prior to rolling, an optimized thickness profile of the blank can be produced after rolling, which is adapted to the later component requirements.
  • a board is understood to be a sheet metal element which is produced from a strip material or from a coil. That is, the process step of the area by area Temperaturver standsns the board is a production of the board made of a strip material upstream. It is understood that between the separation of boards from the strip material and the area-wise temperature change of the board other process steps may be interposed, for example, a heat treatment.
  • the production of the boards from the strip material or the coil can be arbitrary and depends on the final contour of the board to be manufactured.
  • the boards can be made by simply cutting the strip material into individual elements with at least two parallel side edges, or by cutting or punching individual elements with an individual circumferential contour from the strip material. These cut-out elements with individual circumferential contours can also be referred to as shaped cuts or contour cuts.
  • nip is the term for the roll opening including the roll jump at the contact surfaces of the rolling stock with the rolls over the roll bale length.
  • Roll skip is the name given to an enlargement of the roll opening when the rolling stock is punctured by stretching the parts of the roll stand.
  • the rolling force can, in contrast to the nip, change as it passes through the board. The transitions between two board sections with different strip thickness are due to the temperature distribution in the board and can with appropriate partial temperature change before rolling, in contrast to controlled rolling stands, be kept very short. The force-working requirement is greatly reduced by the temperature-dependent flow resistance, so that boards with different thicknesses can be produced in a large width economically.
  • the different temperature ranges are generated according to the later desired thickness profile of the board.
  • the shape and the extent of the temperature ranges in the longitudinal and in the transverse direction of the board can in principle be chosen so that the board has the desired thickness profile after rolling.
  • At least one region, preferably a plurality of regions, of the regions with different temperatures is heated or cooled to a constant temperature transversely to the rolling direction.
  • the juxtaposed in the longitudinal direction of the board areas of the board, each with the adjacent area different temperature lead during rolling to a change in thickness of the board in the longitudinal direction or in the rolling direction of the board.
  • the number and distribution of the areas with different temperature is basically freely selectable depending on the desired thickness profile of the board, the number is in particular between two and six.
  • At least one region if appropriate also several regions, are provided with a variable temperature transversely to the rolling direction. This makes it possible that the board during the subsequent rolling process undergoes a corresponding change in thickness transverse to the rolling direction. Again, that the number and distribution of the areas with different temperature depending on the desired thickness profile of the board to be produced is set.
  • both temperature ranges can be generated, which extend at uniform temperature transverse to the rolling direction, as well as temperature ranges, which have an additional temperature gradient transverse to the rolling direction.
  • the latter third option achieves the highest degree of flexibility with regard to the subsequent thickness progression of the blank after rolling in the longitudinal and in the transverse direction.
  • a three-dimensional thickness structure of the board can be produced herewith.
  • the region-wise changing of the temperature takes place starting from a homogeneous first temperature of the board by heating at least one area of the board to a higher second temperature.
  • homogeneous first temperature is meant that the board uniformly has the same temperature before the area-wise temperature change.
  • at least one region it is meant that one or more regions are heated to an individual temperature. When just one area is heated, two areas of different temperature are created.
  • the height of the temperature to which the board is heated depends essentially on the material or on the strength of the material.
  • the at least one region of the board is preferably heated to a second temperature of 400 ° C to 1250 ° C, in particular from 600 ° C to 800 ° C.
  • the board is preferably heated to a second temperature of 150 ° C to 500 ° C.
  • the partial heating of the circuit board can be effected, for example, by means of a stamp, which is brought into contact with the circuit board in such a way that the circuit board assumes at least approximately the temperature of the stamp.
  • the stamp would be designed as a heating die, which preferably has differently controlled temperature zones.
  • the heating in regions can also be carried out inductively by means of one or more current rollers through which the circuit boards are guided, wherein it is provided in particular that the different temperature zones of the circuit boards are produced by varying the power of the current rollers during passage of the circuit boards.
  • the region-wise changing of the temperature is accomplished from a homogeneous first temperature of the board by cooling.
  • the temperature is changed in regions by cooling at least one area of the board to a lower second temperature.
  • the homogeneous first temperature to which the board is heated is between 950 ° C and 1250 ° C.
  • the subsequent partial cooling of the regions takes place at lower second temperatures, which are in particular between 400 ° C. and 950 ° C., preferably between 600 ° C. and 800 ° C.
  • the partial cooling of the board is preferably carried out by means of a punch, which is brought into contact with the board in such a way that the board assumes at least about the temperature of the stamp.
  • the stamp would be designed as a cooling stamp.
  • the stamp may preferably have individually controllable cooling zones, so that the temperature zones of the board can be individually adapted to the later to be produced thickness profile.
  • the boards are subjected to a heat treatment after rolling, preferably a normalization annealing.
  • the boards are preferably heated to a temperature of 950 ° C to 1250 ° C and when using aluminum material to a temperature of 150 ° C to 550 ° C when using steel material.
  • the heating preferably takes place in a heating furnace. This heat treatment produces a uniform microstructure in the board over all sections of different thickness.
  • the board is further processed to the final product.
  • the subsequent method step preferably comprises a forming process, such as deep-drawing.
  • the component can be cured, or annealed, that is, hardening followed by tempering.
  • Particularly advantageous is the Use of a thermoforming process.
  • the board is formed in a thermoforming mold to the intended shape and cured.
  • thermoforming it is also conceivable that only portions of the thermoforming tool are cooled, so that only the sections of the workpiece are cured, which come into contact with the cooled portions of the thermoforming tool. The remaining sections of the workpiece retain a lower hardness.
  • a cooled mold is required which has cooled portions in the portions of the board to be cured or the end product to be made therefrom, or is optionally fully cooled.
  • the solution of the above object is further in an apparatus for producing boards with different thicknesses of a metallic material according to the inventive method, with one or more of the above method steps, wherein the device comprises in the specified order: a tool for dicing of boards from a band material; a temperature-changing tool, with which areas of different temperatures can be generated in the boards; and a rolling tool with a constant nip position, with which the temperature-changed circuit boards are rollable, so that in the boards due to the different temperature ranges sections of different thickness can be produced has.
  • the constant roll gap setting of the rolling tool preferably in an uncontrolled process, is favorable in terms of simple and efficient production.
  • the change in material thickness occurs solely due to different roller jumps of the rolling tool when passing through the boards, which in turn is due to the different flow resistance in the board material or the partially different temperatures of the material.
  • the fact that the temperature-changing tool is preceded by a tool for separating strip material to boards, is the highest for the geometric design of the board to be produced or the end product to be produced from this Given flexibility.
  • boards or products with variable thickness profiles can be generated transversely to the rolling direction.
  • the temperature-changing tool on at least one stamp which can be heated or cooled.
  • the temperature of the board can be partially increased or decreased in one or more areas compared to other areas.
  • the size and shape of the stamp is preferably based on the shape and size of the temperature zones to be generated or the thickness profile of the board to be produced during the rolling process.
  • the stamp has a plurality of areas in which the temperature is individually adjustable. In this way different temperature zones can be created with a stamp on the board.
  • the punch is designed as a heating punch
  • heating wires are preferably provided in the punch, which can heat the punch at least in some areas.
  • the stamp is formed as a cooling die for partial cooling of the board
  • this preferably has channels through which a cooling medium can flow to cool the stamp.
  • the flow rate of the cooling medium through the channels is controllable.
  • a plurality of cooling circuits are provided by the stamp, which are flowed through by cooling medium.
  • the at least one stamp is made of a metallic material with good thermal conductivity, in particular of copper or of a copper-containing material.
  • the rolling tool is preferably designed so that the gap width is constant during rolling. As a result, the power-work demand can be kept very low, which has a favorable effect on the production costs and time.
  • a tool for flexible rolling can also be used, with which a particularly high degree of flexibility with regard to the thickness profile of the boards to be produced is achieved.
  • the device further comprises a heat treatment device, which is connected downstream of the rolling tool.
  • the heat treatment device which is designed in particular as a heating furnace, the boards can be heat-treated, preferably normalized.
  • the heat treatment device is connected downstream of a forming tool after a favorable development.
  • the forming tool is preferably designed in the form of a thermoforming tool, in which the blanks can be formed and at least partially cured.
  • the combination of the area-wise temperature change of the blanks, subsequent rolling, heating and hot forming is particularly favorable, since this allows a very efficient production of sheet metal blanks with variable thickness over the length or the width.
  • the heat input into the board during manufacture, that is, while passing through the individual device stations can be kept low, which in turn has a favorable effect on the production speed and costs. It is particularly advantageous if the boards with the areas which have the highest temperatures after the regional temperature change during the subsequent process steps of rolling and heat treatment to insert into the forming always a temperature of about 500 ° C, in particular of about 600 ° C, for steel materials.
  • FIG. 1 shows a method according to the invention for producing a circuit board 10.
  • the sheet metal blank 10 is preferably made of a metallic material, for example of a steel material or aluminum, and may also be referred to as a sheet metal blank.
  • a process procedure A is shown.
  • a sheet metal element which can be made in particular of a strip material or a coil.
  • the board can be made by simply cutting the strip material into individual elements or by cutting or punching of individual elements of the strip material.
  • the circuit board 10 is treated by means of a temperature-changing tool 30.
  • the board 10 receives different areas 11, 12, 21, which have different temperatures.
  • the region 11 has a temperature of 800 ° C
  • the second region 12 has a temperature of 600 ° C.
  • the transition region 21 lying between the first region 11 and the second region 12 has a variable temperature, which decreases from the first region 11 to the second region 12.
  • solid line temperature curve shows the temperature profile for the first region 11 over time.
  • the temperature starting from the initial temperature of 0 ° C, initially increases sharply until the target temperature T A1,11 of 800 ° C is reached.
  • the dashed line shows the temperature profile for the second region 12.
  • the circuit board 10 After the area-wise temperature treatment of the board 10, this is subjected to a rolling process in the subsequent process step A2. This is done by means of a rolling tool 40, which comprises a plurality of rollers 41, 42.
  • a rolling tool 40 which comprises a plurality of rollers 41, 42.
  • the circuit board 10 has correspondingly different flow resistances.
  • the hotter first region 11 has a lower flow resistance, which is why it is more heavily rolled off.
  • the cooler second region 12 of the board has a higher flow resistance, so that it is less severed. Due to these different flow resistances, portions 11 2 , 12 2 , 21 2 of different thickness are produced on the blank 10 by the rolling process A2.
  • the board After the rolling process, the board is provided with subscripts centered around the number two. It can be seen that the board 10 2 after passing through the rolling tool 40 has a first portion 11 2 with a smaller sheet thickness and a second portion 12 2 with a larger sheet thickness and an intermediate transition portion 21 2 .
  • the nip position When passing through the blank 10 by the rolling tool 40, the nip position remains constant, d. H. the distance between the rollers is not changed when passing through the sheet metal blank 10.
  • the thickness profile results solely due to the different temperature ranges 11, 12, 21 of the board 10. Overall, this results in a low power work demand. It will be understood, however, that a flexible rolling in which the nip position is varied during the process can also be used. This results in a further increased flexibility and further possibilities of individual design of different thickness profiles on the boards 10.
  • the temperature profile T A2 is shown before, after and during rolling.
  • the solid line again shows the temperature profile for the region 11 or the present after the rolling process section 112.
  • the temperature decreases slightly and during rolling then more off, to a temperature of about 700 ° C.
  • the rolled board 10 2 further cools, so that the temperature decreases accordingly.
  • the temperature profile T A2,12 for the second region 12 runs as far as possible parallel to the temperature range T A2,11 for the first region 11 with a reduced by about 200 ° C temperature.
  • the rolled board 10 2 is subjected to a heat treatment.
  • the board or its sections are provided after the heat treatment with subscript by three digits indices.
  • the heat treatment is preferably carried out in a furnace 50.
  • solidification of the material resulting from rolling is reduced or dissolved and the rolled plate 10 3 again receives a higher ductility and ductility.
  • the board can be 10 3 in the following steps easier to further process, in addition, the material properties of the final product to be produced are positively influenced.
  • the heat treatment in method step A3 is only optional, that is to say that the board 10 2 can in principle also be further processed without subsequent heat treatment.
  • the board 10 3 is heated to about 950 ° C.
  • the thinner first board section 11 3 heats up faster than the thicker board section 123.
  • the board 10 3 can be further processed.
  • a shaping machining in a thermoforming tool 60 is shown here.
  • the board or its sections are provided in connection with the thermoforming process with subscripted by the number four indices.
  • thermoforming according to method step A4 the board 10 4 is subjected to a shaping treatment and at the same time strongly cooled or hardened. This can also be seen in the temperature profile, namely for the thinner first section 11 4 (temperature T A4,11 ) shows a sharp drop in temperature from 950 ° C to below 200 ° C.
  • the thicker second board section 12 4 cooled slightly slower, as the dashed line (temperature T A4,12 ) can be seen.
  • other than hot forming processes can be used as a shaping processing.
  • a further processing by means of pressing or deep drawing may be mentioned here.
  • FIGS. 2a) and 2b ) show a method according to the invention for the production of a sheet metal blank with different thicknesses according to a second process procedure B.
  • the same or modified components are provided with the same reference numerals, as in FIG. 1 , In the following, essentially the differences of the present method will be discussed.
  • the peculiarity of the procedure B according to FIG. 2 consists in that the sheet metal blank is first heated in a step B0.
  • the temperature to which the sheet metal blank 10 is heated depends on the material or the strength of the material; this is preferably between 900 ° C and 950 ° C for a steel material.
  • a partial temperature change of the sheet metal blank 10 is made in the subsequent step B1. This takes place in the present embodiment by areawise cooling of the sheet metal blank 10.
  • the board 10 1 in the present example a first region 11 1 , which is cooled to 800 ° C, and a second region 12 1 , which is cooled to 600 ° C.
  • Between the two regions 11 1 , 12 1 is a transition region 21 1 with a variable temperature profile over the length or the subsequent rolling direction.
  • the solid line shows the temperature profile T B11 for the first area 11, while the dashed line shows the temperature profile T B12 over the time for the second area 12.
  • the first region 11 1 of the board 10 1 is cooled from 950 ° C. to about 800 ° C. (temperature curve T B1,11 ).
  • the second region 12 1 experiences a greater cooling, namely to about 600 ° C (temperature curve T B1,12 ).
  • the present at this time product corresponds to the board 10 1 from the first procedure A according to FIG. 1a ), b), as present after the first process step A1.
  • the process steps B2, B3 and B4 following the second process procedure B correspond to the process steps A2, A3 and A4 according to FIG FIG. 1 , so that reference is made in this regard to the above description.
  • the peculiarity of the present embodiment according to FIG. 2 is that the regionally changing the temperature TB 1 starting from the homogeneous first temperature, which takes place after the heating in step B0, is accomplished by cooling.
  • This process procedure has the advantage that the heat from the previous heating process according to process step B0 can be used, so that the present process is very effective.
  • the partial cooling of the circuit board 10 is preferably carried out by means of a punch 30, which is brought into contact with the circuit board 10 in such a way that the circuit board 10 assumes the temperature of the punch 30.
  • the stamp 30 has in particular a plurality of cooling zones, which are individually adjustable.
  • the plunger 30 may include a plurality of channels through which a cooling medium may flow to cool it.
  • the flow rate of the cooling medium through the channels is controllable.
  • the plunger 30 has a plurality of cooling circuits through which cooling medium flows. It can be generated by individual adjustment of the flow rate of the cooling medium through each channel different temperature zones.
  • the stamp is preferably made of a metallic material with good thermal conductivity, for example of copper or of a copper-containing material.
  • the two embodiments for the different areas of the board 10, which in the FIGS. 1 and 2 are shown, are exemplary only.
  • the number and distribution of the regions 11, 12, 21 with different temperatures T 11 , T 12 , T 21 is basically freely selectable and can be adapted to those with regard to the thickness profile of the workpiece to be manufactured.
  • the number of regions 11, 12, 21 having different temperatures T 11 , T 12 , T 21 is preferably between two and six, wherein more regions are also conceivable.
  • FIG. 3 shows a further example of a board after the partial change of the temperature according to the method step A1 or B1.
  • the circuit board 10 in the present case has six regions 11-16 each having an individual temperature T 11 -T 16 . These are each shown as white areas. Between the six areas 11-16 each having a uniform temperature T 11 -T 16 are respectively Transition regions 21-25, in which the temperatures T 2 , -T 25 are variable. These transition regions 21-25 are shown hatched. Here, the temperature continuously changes from one temperature range to the next. The manufacturing or later rolling direction is indicated by an arrow R.
  • FIG. 3b shows the sheet metal blank 10 before rolling in side view, ie in profile, in greatly exaggerated representation.
  • the board 10 before the rolling process has a uniform thickness over the length.
  • Figure 3c shows the board 10 2 after the rolling process according to the method step A2 FIG. 1 or B2 after FIG. 2 ,
  • Figure 3c shows the board 10 2 by rolling a variable thickness profile over the length. Due to the different temperature zones 11-16 generated before rolling, the more heated areas 13, 16 were more strongly rolled out due to the lower flow resistances than the colder areas 12, 15 Figure 3c ) shown schematically thickness profile of the board 10 over the length.
  • FIGS. 4a ) and b show a sheet metal blank 10 in a further possible embodiment after the partial change of the temperature and before the rolling process according to FIG. 4a ) or after rolling according to FIG. 4b ).
  • the distribution of the different temperature ranges largely corresponds to that according to FIG. 3 , so that reference is made to the above description in terms of similarities.
  • a special feature of the present embodiment is that the region 15 has a temperature gradient transverse to the rolling direction R of the board 10. That is, the temperature T 15 'is about 600 ° C on one side 18 and about 800 ° C on the opposite other side 19.
  • the remaining areas 11, 12, 13, 14 and 16 have transversely to the rolling direction R largely uniform temperatures.
  • the board 10 2 Characterized in that the temperature in the region 15 is variable transversely to the rolling direction, the board is unevenly rolled off. It is in FIG. 4b ) recognizable that the board 10 2 has undergone a shape change in the longitudinal direction after rolling. In this case, the board 10 2 on the side 18 of the region 15, which is more strongly cooled to 600 ° C. was less severely rolled than on the opposite side 19, which has been cooled to only 800 ° C. Thus, a total, in plan view of the board 10, a kink in this section 15 first The thickness profile along the length at the side 18, the region 15 has been cooled more, is in Figure 4c ). This corresponds essentially to the profile according to Figure 3c ), wherein in the present case in particular the transition regions 22 are made thinner.
  • the sheet metal blanks 10 to be produced can be individually adapted to the desired thickness profile for the subsequent end product.
  • the benefit of relating to the FIGS. 1 and 2 described method according to the invention and the associated devices is that finished mold cuts can be made within a short process chain with high efficiency.
  • the combination of the process control with partial temperature change according to method step A1 or B1 of the sheet metal blank 10 before rolling, subsequent normalization and final hot forming is particularly favorable, since the temperature level in the metal sheet overall remains relatively high over the entire process chain, in particular over 400 ° C to 500 ° C, and thus the input of energy for manufacturing is low. In this way, the shape cutting boards can be produced with a short process chain and the associated high efficiency.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Laminated Bodies (AREA)
EP12173868.6A 2011-06-27 2012-06-27 Procédé de fabrication de platines de différentes épaisseurs Active EP2540405B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011051345A DE102011051345A1 (de) 2011-06-27 2011-06-27 Verfahren und Vorrichtung zum Herstellen von Platinen mit unterschiedlichen Dicken

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EP2540405A2 true EP2540405A2 (fr) 2013-01-02
EP2540405A3 EP2540405A3 (fr) 2013-09-11
EP2540405B1 EP2540405B1 (fr) 2018-04-25

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WO2016146107A1 (fr) * 2015-03-13 2016-09-22 Benteler Automobiltechnik Gmbh Procédé servant à fabriquer un composant de mise en forme en tôle présentant des épaisseurs de paroi différentes les unes des autres par endroits, et faux châssis

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US20130283881A1 (en) 2013-10-31
DE102011051345A1 (de) 2012-12-27

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