EP4082102A1 - Procédé d'emballage de pièces en tôle à partir d'une bande ou d'une tôle électrique pour former des emballages en tôle - Google Patents

Procédé d'emballage de pièces en tôle à partir d'une bande ou d'une tôle électrique pour former des emballages en tôle

Info

Publication number
EP4082102A1
EP4082102A1 EP21715485.5A EP21715485A EP4082102A1 EP 4082102 A1 EP4082102 A1 EP 4082102A1 EP 21715485 A EP21715485 A EP 21715485A EP 4082102 A1 EP4082102 A1 EP 4082102A1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
hot
metal parts
melt adhesive
package height
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.)
Pending
Application number
EP21715485.5A
Other languages
German (de)
English (en)
Inventor
Ronald Fluch
Peter ATZMÜLLER
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl 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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP4082102A1 publication Critical patent/EP4082102A1/fr
Pending legal-status Critical Current

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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/20—Storage arrangements; Piling or unpiling
    • B21D43/22—Devices for piling sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B32B38/004—Heat treatment by physically contacting the layers, e.g. by the use of heated platens or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B39/00—Layout of apparatus or plants, e.g. modular laminating systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1215—Hot-melt adhesive

Definitions

  • the invention relates to a method for packaging of, on at least one of its flat sides, a hotmelt adhesive lacquer layer, in particular a baked enamel layer, aufwei send sheet metal parts from an electrical steel strip or sheet to sheet metal stacks, each with a package height hp in a tolerance range of a predetermined target package height hs.
  • the stack height is usually recorded after baking, i.e. heating of the laminated stack above a bonding temperature of the hotmelt adhesive varnish with a correspondingly sufficient bonding time. Then unsuitable sheet metal packages are sorted out in the package height.
  • the height can also be determined after the stacking and before the heating for baking, to sort out insufficient sheet packs in the package height before baking or to adjust the height in order to reduce the scrap of sheet metal packages.
  • this method also has the disadvantage that it is not possible to predict with certainty the package height that the laminated packages will have after baking. The reason for this lies in the numerous influencing factors.
  • each individual sheet metal part can vary, for example in the range of a few ⁇ m; on the other hand, this can also be the case with the height of the hot-melt adhesive lacquer layer. In the worst case, these factors can add up, which means that the package height of the baked sheet metal packages can vary considerably. This reduces the reproducibility of such Method for the production of laminated cores with a parcel height hp in a tolerance range Uh to a predetermined target parcel height hs.
  • US 2017/001258 A1 therefore proposes regulating the process parameters when baking the laminated core.
  • parameters such as the temperature profile over time, the axial pressure on the laminated core and the recorded height of the laminated core are included in order to affect the height of the core.
  • the invention has therefore set itself the task of modifying a method for the production of laminated cores of the type described at the beginning in such a way that exact laminated cores can be produced in a particularly flexible manner and with high reproducibility.
  • the process should ensure continuous and energy-efficient packaging of sheet metal packages.
  • the invention solves the problem posed by the features of claim 1.
  • the packaging process according to the invention can offer the possibility of flexible and exact adjustment of the package height.
  • T g glass transition temperature of the hot-melt adhesive varnish and below the baking temperature of the hot-melt adhesive varnish and are put under pressure in this preheated state
  • the packaging process according to the invention can offer the possibility of flexible and exact adjustment of the package height.
  • this layer connection under pressure and heat can namely reduce unevenness between the individual sheet metal parts and thus the laminated core can be converted much more precisely into the state that exists after the hot-melt adhesive lacquer layers have been baked on the laminated core.
  • a subsequent detection of the package height hp of the individual sheet metal packages from the stacked sheet metal parts with the aid of a measuring method can therefore be carried out particularly precisely.
  • the hot-melt adhesive lacquer layers of each laminated core are finally heated to a second temperature, which is greater than or equal to the baking temperature of the hot-melt adhesive lacquer, and thus its sheet metal parts are baked together via the hot-melt adhesive lacquer layers.
  • this possibility of increasing the laminated stacks after the stacking can also contribute to simplifying the manufacturing process, for example by setting the number of stacked laminated sheet metal parts in the direction of an undersize of the stack height. In this way, an excess can be safely avoided, which, as is known, usually cannot be reduced to a sufficient extent by pressure on the laminated core - especially not without having to accept a function-impairing / function-endangering squeezing of hot-melt adhesive varnish.
  • the inventive method is therefore characterized by a high degree of reproducibility in the production of sheet metal stacks of sheet metal parts that are exact in height.
  • the use of the thermal energy from the preheating during the final heating can also improve the energy efficiency in the continuous production of laminated cores.
  • the at least one sheet metal part is preferably applied to the hot-melt adhesive lacquer layer on the sheet-metal package. As a result, the sheet metal part is applied to a warm enamel layer, which can improve the connection of the additional sheet metal part.
  • the additional sheet metal part is preferably heated to the first temperature.
  • the at least one sheet metal part is preferably applied under pressure to the end face of the sheet metal package. In this way, the bond between the sheet metal part and the laminated core can be further improved.
  • the applied sheet metal part can be the same as the sheet metal parts stacked one on top of the other, that is to say can also have a hot-melt adhesive lacquer layer, in particular a baked lacquer layer, on at least one of its flat sides.
  • Simple process conditions can result if the first temperature is in the range from 90 ° C. to 150 ° C., in particular 100 ° C. to 120 ° C., and / or that the second temperature is in the range from 180 ° C. to 250 ° C., in particular from 180 ° C to 220 ° C.
  • Short cycle times can be guaranteed if the package height is recorded and / or the package height is adjusted in the preheated state of the hot-melt adhesive lacquer layers.
  • the process can run continuously if the hotmelt adhesive lacquer layers are heated to the first temperature in a stacking device takes place, which is connected to a punching tool, which punching tool puts the hotmelt adhesive lacquer layers in the stacking device under pressure.
  • This refinement of the process can also facilitate handling in the flow from one device to the next - for example, by adjusting the package height in a package regulating device and / or by baking the sheet metal parts in a second oven.
  • the reproducibility of the process can be further improved if all the laminated cores are placed under the same high pressure.
  • a trend analysis of the stack heights of the laminated stacks can be carried out in a reproducible manner.
  • the pressure is preferably in the range from 2 to 10 N / mm 2 , in particular from 3 to 5 N / mm 2
  • each sheet metal part is preferably between 0.1 and 0.5 mm, in particular from 0.1 to 0.3 mm, and / or the thickness of the hot-melt adhesive lacquer layer of each sheet metal part is between 2 and 12 ⁇ m, in particular from 4 to 8 ⁇ m . In this way, particularly advantageous prerequisites for high reproducibility of the process can be achieved.
  • the method can be particularly suitable for comparatively high laminated cores, for example when each laminated core has more than 100 sheet metal parts.
  • the number of sheet metal parts is reduced by at least one sheet metal part when the sheet metal core is stacked on top of each other in the event that the target package height is exceeded by the recorded package height of the sheet metal core, this can be an intention Packing the laminated stacks an undersize of the stack height may be beneficial - but at least an excess can be avoided in the process. The reproducibility of the process can thus be further increased.
  • the number of sheet metal parts for the respective sheet metal package can be increased by at least one sheet metal part if the package height of the sheet metal package falls below the target package height when the sheet metal package is stacked on top of one another.
  • the number of sheet metal parts stacked on top of one another to form a laminated core is always selected such that the detected package height is less than the nominal package height of the laminated core by at least the thickness of one sheet metal part of the sheet metal parts stacked one on top of the other.
  • the package height is adjusted by applying one to five sheet metal parts, in particular one to three sheet metal parts, to the front end of the sheet metal package, this can contribute to a sufficient increase in the package height.
  • Such an adaptation in the number of sheet metal parts can also prevent other inaccuracies from influencing the dimensional accuracy of the laminated core.
  • 1 shows a schematic representation of a first device for carrying out the method according to the invention
  • 2 shows a schematic representation of a second device for carrying out the method according to the invention
  • FIG. 4a shows a flea course of laminated cores packaged according to a method according to the prior art
  • 4b shows a flea course of laminated cores packaged according to the method according to the invention.
  • the package height hp is in a tolerance range to a predetermined target package height hs.
  • the laminated cores 2 are preferably used for electromagnetic components, for example for electrical machines.
  • the device 1 a - as shown in FIG. 1 - separates several sheet metal parts 4 from an electrical strip 3.
  • thermosetting hot-melt adhesive lacquer layer 7 preferably based on an epoxy resin, for example a baked lacquer layer.
  • the thermosetting or hot-curing hot-melt adhesive lacquer layers 7 can consist of baking lacquer.
  • a catalytic baked enamel can also be used, e.g .: baked enamel with a depot coating for faster reaction.
  • the sheet metal parts 4 are separated off with a punching tool 5, which can also be part of a subsequent punching tool (not shown). Other facilities for separating sheet metal parts 4, such as lasers, are conceivable.
  • the thickness of each sheet metal part 4 is preferably between 0.1 and 0.5 mm and the thickness of each hot-melt adhesive lacquer layer 7 between 2 and 12 ⁇ m.
  • the sheet metal parts 4 are pushed into a stacking device 6 by the punch 5a of the punching tool 5.
  • the sheet metal parts 4 which have a hot-melt adhesive lacquer layer 7 on at least one of their flat sides 4a, namely Baked lacquer layer, have, stacked one on top of the other. Two of these stacked sheet metal parts 4 can be seen in FIG. 3a. All sheet metal parts 4 stacked on top of one another leave the stacking device 6 in sheet metal stacks 2 or are separated into sheet metal stacks 2 when they leave the stacking device 6, which has not been shown in more detail.
  • the laminated cores 2 are then subjected to further process steps - namely the laminated core 2 is introduced into a first furnace 8 in order to bring the hot-melt adhesive lacquer layers 7 of the stacked sheet metal parts 4 to a first temperature t1, which is above a glass transition temperature T g of the hot-melt adhesive lacquer 7 and un is below the baking temperature of the hot melt adhesive varnish, preheated.
  • the first temperature t1 is preferably 90 ° C. (90 degrees Celsius).
  • the laminated core 2 is introduced into a press 9, which exerts an axial compressive force P on the laminated core 2 on the laminated core 2 with a press ram 9a on the laminated core 2 - see compressive force P in FIG. 3a.
  • This pressing force P compensates for unevenness, for example in the connection of the hot-melt adhesive varnish 7 to a sheet metal part 4 or also to a hot-melt adhesive varnish 7 of an adjoining sheet metal part 4 - see FIG. 3b in this regard.
  • the press 9 puts all the laminated cores 2 under the same high pressure, which is in the range from 2 to 10 N / mm 2, preferably from 3 to 5 N / mm 2, namely 4 N / mm 2.
  • This pressing force P can, for example, be sufficient to lead to a complete connection of the hot-melt adhesive lacquer layers 7 in order to eliminate the free areas between the hot-melt adhesive lacquer layers 7, as can be seen in FIG. 3a.
  • the connection of the sheet metal parts 4 to one another can also be considerably improved, which further increases the stability of the sheet metal stacks 2 produced by the method according to the invention.
  • the laminated core 2 or its hot-melt adhesive lacquer layer 7 is also kept at the first temperature t1 during the pressing.
  • Flierzu is the laminated core 2 in a further step after the press 9 a Measuring device 10 supplied, which detects the package height hpm.
  • Measuring device 10 supplied, which detects the package height hpm.
  • a wide variety of measurement methods are conceivable for this, for example optical methods, manual methods, etc., or methods in which the position of the press ram 9a of the press 9 during or after the pressurization of the laminated core 4 is used to determine its height hpm.
  • the stack height hpm is preferably detected by the laminated stack 2, the hot-melt adhesive lacquer layers of which are in the preheated state, which can further increase the accuracy of the measuring method.
  • the tolerance range Ah corresponds overall (ie +/-) to the thickness d of a sheet metal part 4, ie + d / 2 and -d / 2 viewed from the nominal package height hs.
  • the package height (hp) of the laminated core 2, the hot-melt adhesive lacquer layers 7 of which are in the preheated state, is preferably adapted, which makes it easier to connect the sheet metal part 4 to the laminated core 2.
  • the laminated core 2 is brought into a second furnace 12 and there the hotmelt adhesive lacquer layers 7 of the laminated laminate 2 are heated to a second temperature t2, which is greater than or equal to the baking temperature of the hot melt adhesive varnish, and their sheet metal parts 4 are exerted under pressure from an oven stamp 12a, together with a sufficiently long baking time.
  • the second temperature t2 is 190 ° C. (190 degrees Celsius) and the baking time is 15 minutes.
  • the method according to the invention is therefore extremely flexible and produces exact sheet metal stacks 2 with a high level of reproducibility.
  • the method is particularly characterized by the fact that sheet metal stacks 2 with a tendency to undersize can be stacked from sheet metal parts 4, because there is the possibility of being able to supplement such undersized sheet metal stacks 2 with an additional sheet metal part 4. It may therefore be unnecessary to bring excessive Blechpa kete 2 when baking by pressure to size, which is only slightly possible anyway. Squeezing out 13 of hot-melt adhesive varnish, as shown in FIG.
  • the device 1 b according to FIG. 2 differs from the device 1 a of FIG. 1 essentially in that the preheating and the loading of the hotmelt adhesive lacquer layers 7 with pressure is not carried out on the laminated core 2, but in the stacking device 6.
  • the stacking device 6 is provided with a wall heater 6a, which heats the hot-melt adhesive lacquer layers 7 to the first temperature t1.
  • the punch 5a presses the separated sheet metal parts 4 into the stacking device 6 against the counterforce of a counter-holder 6b - which leads to an axial force on the sheet metal parts 4 stacked on top of one another and thus loads the preheated hotmelt adhesive lacquer layers 7 with pressure.
  • This method is characterized by a smaller number of method steps and thus leads to reduced cycle times in the stacking of laminated stacks 2 with an exact stack height of hp.
  • Fig. 4a discloses a method for stacking laminated cores according to the prior art, in which a trend analysis of the height H, over twenty laminated cores, is performed.
  • the laminated cores with the number 7 to 13 are oversized, so they are outside the upper limit of the tolerance range Ah for a target stack height hs.
  • This trend is driven by the Trend analysis recognized, and the number of sheet metal parts stacked on top of one another is reduced to such an extent that the package height hp is again within the required tolerance range Ah for a target package height hs.
  • the stack height is currently decreasing in contrast to the previous laminated stacks, the laminated stack with the number 16 suddenly becomes undersized. This cannot be corrected in the prior art and represents a scrap.
  • the method according to the invention discloses the method according to the invention, in which there is the option of adding at least one further sheet metal part 4 to stacked sheet metal stacks 2 from sheet metal parts 4. Therefore, the method according to the invention can also be carried out with a tendency to set the number of sheet metal parts 4 stacked on top of one another to an undersize relative to the tolerance range Ah.
  • Known trend analyzes can be neglected because, as mentioned, the package height hp can always be adapted to the tolerance range Ah to a target package height hs by applying sheet metal parts.
  • the number of applied sheet metal parts 4 can remain small and preferably be from one to five sheet metal parts 4 to ensure the reproducibility of the method.
  • the sheet metal stacks with the number 1, 2, 3, 4, 5, 15, 19 lack the two stacked sheet metal parts 4, the sheet metal package 16 three stacked sheet metal parts 4 and the other sheet metal stacks each have a stacked sheet metal part 4 as can be seen from the recorded package height hpm.
  • the respectively missing sheet metal parts 4 are applied by the stacking device 6, which guarantees a produced package height hp within the tolerance range Ah to the target package height hs.
  • the method according to the invention can therefore produce sheet-metal stacks 3 of exact shape without rejects.
  • This adjustment of the stack height hs arranged after the stacking on top of one another can also be integrated comparatively easily in the method. This is due to the fact that the cycle time is essentially dictated by the longer curing time during final heating anyway.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne un procédé d'emballage de pièces en tôle (4) à partir d'une bande ou d'une tôle électrique (3) pour former des paquets de tôle (2), ayant chacun une hauteur de paquet (hp) dans une plage de tolérance (Δh) par rapport à une hauteur de paquet cible prédéterminée (hs).
EP21715485.5A 2020-03-02 2021-03-02 Procédé d'emballage de pièces en tôle à partir d'une bande ou d'une tôle électrique pour former des emballages en tôle Pending EP4082102A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20160522.7A EP3876403A1 (fr) 2020-03-02 2020-03-02 Procédé de paquetage des parties de tôle en paquets de tôles
PCT/EP2021/055226 WO2021175875A1 (fr) 2020-03-02 2021-03-02 Procédé d'emballage de pièces en tôle à partir d'une bande ou d'une tôle électrique pour former des emballages en tôle

Publications (1)

Publication Number Publication Date
EP4082102A1 true EP4082102A1 (fr) 2022-11-02

Family

ID=69770387

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20160522.7A Withdrawn EP3876403A1 (fr) 2020-03-02 2020-03-02 Procédé de paquetage des parties de tôle en paquets de tôles
EP21715485.5A Pending EP4082102A1 (fr) 2020-03-02 2021-03-02 Procédé d'emballage de pièces en tôle à partir d'une bande ou d'une tôle électrique pour former des emballages en tôle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20160522.7A Withdrawn EP3876403A1 (fr) 2020-03-02 2020-03-02 Procédé de paquetage des parties de tôle en paquets de tôles

Country Status (5)

Country Link
US (1) US11745247B2 (fr)
EP (2) EP3876403A1 (fr)
KR (1) KR20220151639A (fr)
CN (1) CN115380459A (fr)
WO (1) WO2021175875A1 (fr)

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US20220111430A1 (en) * 2019-05-08 2022-04-14 Voestalpine Stahl Gmbh Method for stacking punched lamination elements to form lamination stacks
EP4325533A1 (fr) 2022-08-19 2024-02-21 voestalpine Stahl GmbH Procédé de paquetage de pièces de tôle d'une bande ou tôle électrique pour obtenir un paquet de tôles
WO2024086748A2 (fr) * 2022-10-19 2024-04-25 Alloy Enterprises Inc. Fabrication de parties d'objet stratifiées métalliques à grande échelle
EP4329167A1 (fr) * 2022-11-04 2024-02-28 voestalpine Stahl GmbH Procédé de paquetage de pièces de tôle d'une bande ou tôle électrique pour obtenir au moins un paquet de tôles
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CN115380459A (zh) 2022-11-22
EP3876403A1 (fr) 2021-09-08
US20230100562A1 (en) 2023-03-30
WO2021175875A1 (fr) 2021-09-10

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