Method for producing packs of laminations lying on top of each other and system for carrying out such method

Abstract

To provide a method for producing packs of laminations lying on top of each other so as to grant stack formation of laminations using an adhesive without exerting adverse influences upon an electrical value in subsequent use of the packs of the laminations and with reliability, and a system for carrying out such a method.SOLUTION: A method is used for producing a lamination pack 3 consisting of laminations 2 lying on top of each other. The lamination is cut away from a departure material 1 and connected with each other in the lamination pack using a radially activatable adhesive 4. The adhesive 4 is irradiated for pre-activation using radiation having a wavelength range lower than IR radiation. A device used therefor has at least one coating device for coating a surface of the lamination with the adhesive. The adhesive is irradiated using at least one radiation source 32 which radiates the radiation within the wavelength range lower than an infrared range.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The invention relates to a method for producing a thin sheet package made of overlapping thin sheets according to the preamble of claim 1 as well as to an apparatus for carrying out such a method according to the preamble of claim 12. [Background technology]

[0002] In the manufacture of sheet packages (sheet stacks), such as those used for rotors or stators of electric motors or generators, it is known to separate sheets from overlapping electrical strips or metal sheets to form the sheet stack. The overlapping sheets can be fixedly connected to one another in various ways. Summary of the Invention [Problem to be solved by the invention]

[0003] One connection possibility is the use of adhesives to bond overlapping sheets together. These adhesives are activated by irradiation after application (post-installation). Infrared light is used for this purpose. While infrared light can be used to achieve successful activation, it also generates heat within the metal sheets. This results in unintended deformation of the sheets, which can impair the formation of the sheet package. Furthermore, heating of the sheets can lead to unwanted electrical failures during subsequent use of the rotor or stator. To minimize such unacceptable deformation of the sheets, cooling devices are used, but these cooling devices increase the cost and effort required for the system.

[0004] The object of the present invention is to configure a method of the above type as well as an apparatus of the above type in such a way that the stacking of the thin sheets with adhesive is reliably ensured without adversely affecting the electrical properties of the thin sheet package in subsequent use. [Means for solving the problem]

[0005] This problem is solved according to the invention in a method of the above type by using the features of claim 1 and in a device of the above type by using the features of claim 12.

[0006] The method according to the invention uses an adhesive that can be preactivated with radiation in a wavelength range below that of IR radiation, so that activation of the adhesive does not generate heat that would lead to distortion or deformation of the sheet. Therefore, no cooling of the sheet or sheet package is required to carry out the method according to the invention, so that the equipment used therefor is simple in construction and inexpensive to purchase.

[0007] The adhesive has a short reaction time, so that when each next sheet is placed in the stack, the adhesive can react in such a way that the overlapping sheets are already connected to one another in a sufficiently secure manner, with a strength sufficient to allow the respective formed sheet packages to be handled immediately after completion, and in particular to transport the sheet packages to the customer, without the risk of the sheet packages falling apart.

[0008] The preferred wavelength range of the radiation is located in the range between approximately 300 μm and approximately 700 μm, within which the adhesive is optimally preactivated.

[0009] In the method according to the invention, the adhesive is pre-activated so that the formed sheet metal package is ready for handling (trade), which has the advantage for the manufacturer of the sheet metal package that they can send the sheet metal package to, for example, a customer immediately after the package is formed and do not have to wait until the adhesive has reached sufficient package strength.

[0010] A particularly advantageous adhesive has been found to be a cationically cured epoxy resin adhesive.

[0011] The method according to the invention is advantageously configured such that the adhesive hardens after pre-activation and during and after the formation of the thin sheet package so that the thin sheet package has the required package strength for subsequent use.

[0012] A particularly simple method of operation is obtained if the radiation is directed so that it is directed at the adhesive present on the sheet or starting material, the adhesive then being perfectly preactivated.

[0013] In a simple method, the radiation strikes the sheet or starting material perpendicularly. The adhesive on the sheet or starting material is irradiated in the form of a surface or in the form of a point or spot, depending on the extent of the adhesive.

[0014] In another advantageous embodiment, the radiation is directed so that it does not strike the sheet or starting material perpendicularly, but at an angle other than 90°. This can be advantageous, for example, if the mounting situation of the device does not allow for mounting the radiation source perpendicularly above the sheet or starting material.

[0015] In a further embodiment of the present invention, the adhesive is irradiated in flight (in the air) while being delivered from the application device to the sheet or starting material before being applied to the sheet or starting material. When the adhesive hits the sheet or starting material, the adhesive is already pre-activated. This method allows for particularly simple and reliable sheet packaging.

[0016] In this method type, the radiation is preferably applied perpendicular to the path of the adhesive fall.

[0017] The adhesive can be applied to the sheet or starting material in the form of droplets, but also in the form of an adhesive film, and the radiation is accordingly designed so that the adhesive is irradiated perfectly in flight.

[0018] Furthermore, it is also possible to apply the adhesive to the sheet or starting material by means of an application roller, which in this case comes into contact with the sheet or starting material.

[0019] The application roller is preferably configured so that it applies a glue pattern to the sheet or starting material, the glue pattern being adapted to the shape of the sheet to be produced, so that the glue is provided where required after cutting out the sheet.

[0020] The device according to the invention is distinguished in that it comprises at least one radiation source which emits radiation in a wavelength range below the infrared wavelength range.

[0021] The wavelength range is advantageously located in the range between approximately 300 μm and approximately 700 μm.

[0022] The radiation source is preferably arranged in the device so that the radiation emitted from the radiation source strikes the adhesive on the sheet or starting material, thereby allowing the adhesive to be first applied to the sheet or starting material and then irradiated for preactivation.

[0023] In a further embodiment of the invention, the device is arranged so that the radiation of the radiation source strikes the adhesive as it falls from the application device onto the sheet.

[0024] Such an arrangement is particularly advantageous if the adhesive application is carried out beforehand in the areas where the sheets are to be separated.

[0025] In order to ensure a particularly reliable and satisfactory preactivation of the adhesive in such a radiation source arrangement, it is advantageous if there is a diaphragm element (shade element) in the radiation path of the radiation source, the opening of which is preferably adjustable in terms of its cross section, so that the radiation can be adapted independently of whether the adhesive is provided in the form of drops, strips, etc.

[0026] Furthermore, the applicator can be configured as an applicator roller rotatable about a shaft, the outer surface (side surface) of which is provided with at least one application or supply opening for adhesive. To apply the adhesive, the applicator roller contacts the sheet or starting material, and the adhesive is applied through the supply opening. The position of the supply opening or the diameter of the applicator roller is selected so that the adhesive emerging from the supply opening is applied to the sheet or starting material at the position required for subsequent package formation.

[0027] The application openings are preferably configured as a screen (sieve), whereby the adhesive can pass through the screen openings (sieve openings) and be applied onto the sheet or starting material. In particular, a screen-like configuration can be used to easily apply adhesive patterns onto the sheet or starting material.

[0028] To ensure a clean adhesive application, the application roller is preferably contacted by a cleaning roller, which is arranged axially parallel to the application roller, and by means of which the roller surface is freed from adhering adhesive, so that it is easily achieved that the adhesive reaches the sheet or starting material only in the area where the application openings are located.

[0029] The subject matter of the application is derived not only from the subject matter of the individual patent claims, but also from the drawings and all the descriptions and features disclosed in the specification, which, even if not the subject matter of the claims, are claimed as essential to the invention insofar as they are novel individually or in combination over the prior art.

[0030] Further features of the invention are apparent from the further claims, the description and the drawings.

[0031] The present invention will be explained in more detail below based on several embodiments shown in the drawings. [Brief explanation of the drawings]

[0032] [Figure 1] 1 shows, in a schematic diagram, an apparatus according to the invention for applying a radiation activatable adhesive onto electrical strips that are punched or cut from a sheet metal; FIG. [Figure 2] 2 shows an enlarged view of the application roller of the device according to FIG. 1 from above; FIG. [Figure 3] 3 is a view showing the outer surface of the applying roller shown in FIG. 2 laid out on the drawing plane. [Figure 4] FIG. 1 shows an enlarged view of a portion of a thin plate having a geometry-specific bond. [Figure 5] 1 shows a simplified diagram of an adhesive application device according to the invention; [Figure 6] 6 is a view corresponding to FIG. 5 and showing another embodiment of the adhesive application device according to the present invention. FIG. [Figure 7] 6 is a view corresponding to FIG. 5 and showing another embodiment of the adhesive application device according to the present invention. FIG. [Figure 8] 6 is a view corresponding to FIG. 5 and showing another embodiment of the adhesive application device according to the present invention. FIG. [Figure 9] 6 is a view corresponding to FIG. 5 and showing another embodiment of the adhesive application device according to the present invention. FIG. [Figure 10] 6 is a view corresponding to FIG. 5 and showing another embodiment of the adhesive application device according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0033] Using the equipment and devices described below, laminations 2 (FIGS. 4 and 5) are cut from an electrical strip 1 and stacked (FIG. 5) to form lamination packages 3. These lamination packages 3 are used for the rotor or stator of an electric motor or generator.

[0034] The overlapping sheets 2 are fixedly connected to one another in a sheet package 3 by means of adhesive 4 .

[0035] The thin plate 2 can be separated from the electrical strip 1 in various ways, for example by punching, water jet cutting, laser beam cutting, etc.

[0036] The electrical strip 1 is wound up as a coil on a winding machine 5 (Figure 1), from which the electrical strip 1 is unwound in a known manner and fed to a separation station where the laminations 2 are separated from the electrical strip 1.

[0037] At least one adhesive applicator 6 (hereinafter simply referred to as applicator) is disposed in the supply path to the separation station. The adhesive 4 is applied onto the electrical strip 1 using the applicator 6.

[0038] The application of the adhesive 4 is carried out by at least one application roller 7 , to which the adhesive 4 is supplied via at least one adhesive supply line 8 .

[0039] The application roller 7 is driven to rotate about its axis 9 when applying adhesive. As can be seen from Figure 1, in this example the application roller 7 rotates counterclockwise when applying adhesive. The electrical strip 1 is conveyed in a conveying direction 10. In the area where the adhesive 4 is applied, the application roller 7 and the electrical strip 1 therefore have the same direction of movement.

[0040] The roller outer cover 12 has at least one screen-like application opening 13 (or application opening; hereinafter simply referred to as the screen), which is the negative shape of the adhesive geometry to be applied onto the electrical strip 1.

[0041] In the illustrated embodiment, the roller jacket 12 is provided with two such screens 13, which are arranged offset from one another in the circumferential direction of the application roller 7 and spaced apart from one another.

[0042] 3, the lower screen 13 is located in tool lane 14, and the upper screen 13 is located in tool lane 15. Both tool lanes 14, 15 correspond to the tool lanes of the electrical strip 1. The thin sheet 2 is separated from the electrical strip 1 using corresponding tools in the two lanes, with the tool lanes of the separating device corresponding to the tool lanes 14, 15 of the application roller 7.

[0043] The screen 13 produces an adhesive pattern on the sheet 2 or electrical strip 1 which is adapted to the shape of the sheet 2 to be produced.

[0044] The adhesive 4 is supplied to the applicator roller 7 via an adhesive supply line 8. Advantageously, the supply of adhesive 4 takes place within the shaft of the applicator roller 7, which has a corresponding supply line inside it that leads to a screen 13 on the roller mantle 12. The adhesive 4 can pass through the screen 13 to reach the upper surface of the electrical strip 1. Depending on the geometry of the screen 13, a corresponding geometric shape of an adhesive application section 16 arises on the upper surface of the electrical strip 1.

[0045] The application roller 7 is housed in a housing 46, which is filled with a protective gas such as nitrogen to prevent the ingress of oxygen, so that the adhesive 4 is always ready for pre-activation.

[0046] To ensure a clean adhesive application on the electrical strip 1, the application device 6 has at least one cleaning roller 17, which contacts the application roller 7 and has a smaller diameter than the application roller 7. The cleaning roller 17 can be rotatably driven and can be rotated about the axis of the cleaning roller 17 by contact with the rotatably driven application roller 7. Both rollers 7, 17 rotate in opposite directions. The cleaning roller 17 advantageously contacts the application roller 7 with a slight pressure.

[0047] A cleaning roller 17, which is positioned axially parallel to the application roller 7, ensures that the upper surface of the application roller 7 is always free from contamination, thereby ensuring a clean application of adhesive onto the electrical strip 1.

[0048] Depending on the shape of the screen 13, the adhesive 4 can be applied to the electrical strip 1 in the form of a surface or in the form of lines or dots.

[0049] FIG. 4 shows the possibility of applying adhesive 4 onto electrical strip 1, for example in the form of a line.

[0050] In the embodiment shown in Fig. 4, the thin plate 2 separated from the electrical strip 1 has radially extending arms 18 which project inward from a ring-shaped base 19 and are spaced apart from one another. The free ends of the arms 18 are widened in both circumferential directions, with the widened portions of adjacent arms 18 each limiting an insertion opening 20.

[0051] Between the arms 18 are grooves 21 for receiving wire windings (not shown).

[0052] Furthermore, each arm 18 is provided with a radially extending cooling groove 22, which extends, for example, into the base body 19. These cooling grooves 22 are located halfway along the width of the arm 18.

[0053] In this case, the adhesive 4 is applied onto the thin plate 2 so as to surround the cooling groove portions 22 at intervals. The adhesive 4 is guided between the adjacent cooling groove portions 22 and between the arm portions 18 via the ring-shaped base body 19.

[0054] In this way, a continuous adhesive rail is applied around the circumference of the ring-shaped thin plate 2, via which overlapping thin plates 2 within the thin plate package 3 can be fixedly connected to each other.

[0055] The sheet package 3 can be formed from ring-shaped sheets 2 which are separated as rings from the electrical strip 1. If the sheet package 3 has a relatively large diameter, partial ring-shaped sheets are separated from the electrical strip 1 and these are subsequently assembled into a sheet ring.

[0056] The adhesive 4 used is radiation-activatable. For adhesive activation, radiation is used whose wavelength lies in the range between approximately 300 μm and approximately 700 μm. This radiation range lies below the infrared radiation range.

[0057] The adhesive 4 is preferably a cation-curable epoxy resin adhesive.

[0058] Upon activation with radiation corresponding to the aforementioned wavelength range, the adhesive 4 is pre-activated. This pre-activatability allows the adhesive 4 to have such a bond strength that the overlapping sheets 2 within the sheet package 3 are firmly connected to one another, thereby allowing the sheet package 3 to be immediately handled. Complete curing of the adhesive 4 then takes place at room temperature.

[0059] During pre-activation and curing, no or only slight heating occurs, so that the sheet 2 does not undergo distortions that would lead to technical problems during the subsequent use of the sheet package 3. Since no or only slight heat occurs during pre-activation and curing of the adhesive 4, no cooling of the sheet 2 or the sheet package 3 is necessary.

[0060] After preactivation, complete hardening proceeds without the action of additional radiation, which is referred to as shadow hardening.

[0061] The cationically cured epoxy resin adhesive is electrically insulating and tension-uniform. The adhesive can be used over a wide temperature range, ranging from approximately -40°C to approximately 150°C or higher.

[0062] The pre-activation time is typically only a few seconds, which is short but sufficient to form overlapping and bonded laminates 2 together.

[0063] The adhesive 4 is applied on the sheet 2 where the adhesive 4 is needed for the cohesion and strength of the sheet package 3 .

[0064] Accordingly, the screen 13 is provided at a suitable location on the roller jacket 12 of the application roller 7, so that the adhesive application areas 16 are provided at the desired locations on the electrical strip 1. After the adhesive application, the sheet 2 is separated from the electrical strip 1, with the adhesive application areas 16 already being provided at the required locations on the sheet 2 to be punched.

[0065] 5 shows a punching unit 23 of an apparatus for punching sheet metal 2 from an electrical strip 1. The punching unit 23 has a pressure punch 24 which cooperates with a die 25 during the punching process. Using the pressure punch 24, the sheet metal 2 is punched out of the electrical strip 1 and forced into a shaft 26, in which the sheet metal package 3 is produced. The die 25 is part of a lower tool 28, in which the shaft 26 is provided. In the area below the die 25, the shaft 26 is limited by a package brake 27, by means of which the sheet metal package 3 to be formed is held in the shaft 26. The package brake 27 contacts the periphery of the sheet metal package 3 and prevents it from falling downwards.

[0066] Furthermore, a piston (not shown) can be provided in the shaft 26, onto which the first lamina 2 of the lamina package 3 is lowered. With each further lamina 2, the piston is moved stepwise downwards accordingly. In this way, the lamina packages 3 can be stacked on the piston to the required height.

[0067] As soon as the sheet package 3 has reached the required height in the shaft 26 , the sheet package 3 is removed from the shaft 26 via the package dispenser 29 .

[0068] The construction of the punching unit 23 is basically known, so it will not be described in detail.

[0069] Once the sheet 2 is placed on top of the sheets already in the shaft 26, a pressing force is applied by the pressing punch 24, which causes the adhesive application 16 to be crushed. As shown in Figure 5, the application of the pressing force causes the adhesive application 16 to be spread apart, thereby increasing the contact area between the overlapping sheets 2.

[0070] The package brake 27 is configured so that the braking force applied by the package brake 27 and acting on the thin plate package 3 is greater than the pressing force applied by the pressing punch 24 .

[0071] The pressure punch 24 moves vertically in the direction of the arrow 30 during the punching process.

[0072] To separate successive lamination packages 3 from one another within the shaft 26, no adhesive is applied to the last lamination 2 of the lamination package 3, thereby creating a separation 31 between lamination packages 3 positioned above and below.

[0073] To activate the adhesive, the punching unit 23 is provided with at least one UV light source 32 which emits UV light 33 for activating the adhesive application part 16. The UV light source 32 is configured such that the radiation 33 emitted by the UV light source 32 strikes the adhesive application part 16 parallel to the punching movement direction 30.

[0074] The UV light source 32 is configured to be able to irradiate the entire area of ​​the adhesive application portion 16. For example, the UV light source 32 has spot lamps arranged side by side, one behind the other. The light beam 33 emitted from the UV light source 32 can be shaped according to the shape of the adhesive application portion 16. For example, if the adhesive application portion 16 has a circular shape, the UV light 33 can be shaped, for example, as a spot light.

[0075] The pressing punch 24 is provided with a corresponding hole 34 for the passage of UV light 33, through which the UV light 33 can reach the adhesive application part 16. The UV light source 32 is advantageously arranged outside the pressing punch 24.

[0076] The UV light emitted from the UV light source 32 lies within the wavelength range mentioned above, for which the adhesive 4 is adapted for pre-activation.

[0077] Figure 6 shows the possibility of activating the adhesive applications 16 with area UV light 33. On the electrical strip 1 there are adhesive applications 16, which are arranged in both lanes 14, 15 in the manner described above.

[0078] The UV light source 32 is configured as a surface lamp that extends transversely to the transport direction 10 of the electrical strip 1. The UV light source 32 extends beyond both longitudinal edges 35, 36 of the electrical strip 1.

[0079] As in the previous example, the UV light source 32 is mounted in spaced relation above the electrical strip 1 and thus above the adhesive application 16. The UV light 33 impinges on the electrical strip 1 at right angles, as in the previous embodiment, to provide pre-activation of the adhesive application 16.

[0080] The electrical strip 1 has adhesive-free areas 37 between the adhesive applications 16 .

[0081] In this embodiment, the UV light source 32 has a rectangular profile and projects UV light 33 downward across the entire cross-sectional width of the UV light source 32 in the direction of the adhesive application 16. The UV light 33 strikes the adhesive application 16 of both tool lanes 14, 15, thereby allowing pre-activation of the adhesive in both tool lanes 14, 15 in a single pass of the electrical strip 1.

[0082] According to the previous embodiment, the UV light source 32 is arranged in a fixed position with respect to the transport direction 10 of the electrical strip 1 .

[0083] Figure 7 shows a similar configuration of the UV light source 32 as in Figure 6. The only difference is that the UV light source 32 is configured to be narrower than in the embodiment according to Figure 6. As a result, the surface illumination with UV light 33 is narrower than in the previous embodiment.

[0084] 8, the UV light 33 is not directed perpendicularly to the top surface of the electrical strip 1, but rather at an angle. The UV light 33 is directed at an acute angle α to the electrical strip 1 and accordingly impinges obliquely on the adhesive in each adhesive application 16. The inclination angle α of the UV light 33 is selected so that each adhesive application 16 can be satisfactorily activated.

[0085] The UV light source 32 has an obliquely positioned exit window 38 through which the UV light 33 exits at an oblique angle α.

[0086] The UV light source 32 is configured so that radiation emitted from the UV light source 32 strikes each adhesive application 16 .

[0087] 8 shows a punching unit 23 with a pressure punch 24 and a die 25. During the punching process, the pressure punch 24 is moved in the direction of the arrow 30 to punch out the sheets 2 from the electrical strip 1. These sheets 2 are pressed by the pressure punch 24 into a shaft 26 in the manner already described, where they are formed into a sheet package 3.

[0088] 9, the UV light 33 extends parallel to the electrical strip 1. The UV light 33 emerges from a UV light source 32.

[0089] The UV light 33 extends perpendicular to the transport direction of the electrical strip 1. In Figure 9 the transport direction is perpendicular to the plane of the drawing.

[0090] In contrast to the previous embodiment, it is not the adhesive application 16 on the thin plate 2 or on the electrical strip 1 that is irradiated with UV light, but rather the adhesive 4 emerging from an applicator 39. The applicator 39 is advantageously a valve device that drops the adhesive 4 in the form of drops downwards onto the electrical strip 1. The adhesive 4 is irradiated with UV light 33 during the flight of the drops. When the adhesive drops fall onto the electrical strip 1 and form the adhesive application 16 there, the adhesive application 16 has already been pre-activated by the UV light 33.

[0091] Advantageously, a shield-like diaphragm 40 is provided in the region between the UV light source 32 and the applicator 39, which ensures that the UV light 33 is aimed and impinges on the adhesive drops leaving the applicator 39. Advantageously, the aperture cross section of the diaphragm opening 41 is adjustable, so that a reliable pre-activation of the respective adhesive 4 is guaranteed depending on the type of adhesive 4 and / or the type of UV light source 32 or UV light used.

[0092] Advantageously, an apparatus is provided with several applicators 39, via which the adhesive 4 is applied onto the electrical strip 1 where required. The UV light source 32 is configured such that the adhesive drops leaving the different applicators 39 are pre-activated.

[0093] The applicator device 39 is arranged above the electrical strip 1 at a distance such that the exiting adhesive drop can be irradiated with UV light 33 for a sufficiently long time. To this end, it is advantageous if the diaphragm opening 41 is adjustable in size. The beam area of ​​UV light 33 passing through the diaphragm opening 41 in the direction towards the adhesive drop 4 can be adjusted depending on its width measured perpendicular to the electrical strip 1. Accordingly, the width 42 of the portion of UV light 33 passing through the diaphragm opening 41 can be appropriately adapted.

[0094] FIG. 10 shows the possibility of providing different illumination formats in one device.

[0095] In the conveying direction 10 of the electrical strip 1, firstly an apparatus as described with reference to Fig. 9 is provided. The adhesive drops 4 falling downward from the applicator 39 are pre-activated by irradiation with UV light 33 which passes through openings 41 in a diaphragm 40 and runs parallel to the upper surface of the electrical strip 1. The adhesive drops 4 form respective adhesive applications 16 on the electrical strip 1.

[0096] Next in the conveying direction 10 is the UV light source 32, which is configured in accordance with Figure 8 so that UV light 33 strikes the upper surface of the electrical strip 1 or of the respective adhesive application 16 at an angle α. This UV light source 32 is advantageously configured so that it emits UV light 33 continuously.

[0097] Behind this UV light source 32 in the conveying direction 10 there is provided a device corresponding to Figure 7, which is narrower transversely to the conveying direction 10 than the preceding UV light source 32 having obliquely emitting UV light 33.

[0098] In the region of the shaft 26 for forming the thin-film package 3, a UV light source 32 is provided, which corresponds to the embodiment according to Fig. 5. UV light 33 is emitted through a hole 34 in the pressure punch 24 downwards onto the electrical strip 1 or the respective adhesive application 16 thereon.

[0099] Furthermore, FIG. 10 shows the possibility of irradiating the adhesive 4 already in the supply line 43 to the application device 39 with UV light 33 .

[0100] Advantageously, the application device 39 is surrounded at its adhesive outlet 44 by a heating element 45 which can cause the adhesive 4 to fall downwards onto the electrical strip 1 in the form of perfect droplets.

[0101] The device according to Fig. 10 should be seen merely as an example, in which different types of irradiation units can be used in combination with one another. Which irradiation unit is used depends on the respective use of the device. In other words, different UV light sources 32 can be used if required by the type of adhesive 4 to achieve sufficient pre-activation.

[0102] In all the described possibilities, the thin sheet 2 is not heated or only slightly heated by the adhesive 4, so that no distortion or tension occurs in the thin sheet 2. Therefore, the rotor or stator package manufactured from the thin sheet package 3 has good electrical properties. This is due to the fact that a smaller wavelength range of the light source is used for irradiation than the wavelength range provided for IR irradiation.

[0103] 9, the adhesive 4 is not only applied to the electrical strip 1 in the form of individual droplets one after the other. The application device 39 can also be configured so that the adhesive leaves the application device 39, for example, in the form of an adhesive mist. In this case, the UV light source 32 is configured so that the radiation emitted by the UV light source 32 completely captures and preactivates the adhesive mist. In this case, the UV light 33 preferably extends perpendicularly to the adhesive mist, so that the adhesive mist is perfectly irradiated and preactivated therewith. [Explanation of symbols]

[0104] 1 electrical strip 2 thin plate 3 Thin Package 4. Adhesive 5. Windlass 6. Adhesive application equipment / applicator 7 Application roller 8 Adhesive Supply Line 9 Shaft 10 Conveying direction 12 Roller outer cover 13 Provided openings / screens 14 Tool Lane 15 Tool Lane 16 Adhesive application section 17 Cleaning roller 18 Arm section 19 Base 20 Insertion opening 21 Groove 22 Cooling groove 23 Punching unit 24 Pressing punch 25 Die (mold) 26 shaft 27 Package Brake 28 Lower tool 29 Package Delivery Department 30 Punching movement direction 31 separation 32 UV light source 33 UV light 34 Hole 35 longitudinal edge 36 longitudinal edge 37 Adhesive-free area 38 Exit window 39 Coating equipment 40. Aperture member 41 aperture member opening 42 UV light width 43 Supply Line 44 Adhesive outlet 45 Heating element 46 Housing α Tilt angle

Claims

1. A method for manufacturing a thin sheet package (3) consisting of overlapping thin sheets (2), comprising: The method, wherein the laminae (2) are separated from the starting material (1) and connected to each other within the laminae package (3) using a radiation activatable adhesive (4), said adhesive (4) being irradiated for preactivation with radiation having a wavelength range below IR radiation; A method characterized by:

2. the wavelength range of the radiation is located in a range between approximately 300 μm and 700 μm; The method of claim 1 ,

3. the adhesive (4) is activated by irradiation so that the sheets (2) in the sheet package (3) are fixedly connected to one another so that the sheet package (3) can be handled; 3. The method according to claim 1 or 2, characterized in that

4. The adhesive (4) is a cation-curing epoxy resin adhesive; The method according to any one of claims 1 to 3, characterized in that

5. The adhesive (4) hardens within the thin sheet package (3) so that the thin sheet package (3) has the required package strength; The method according to any one of claims 1 to 4, characterized in that

6. said radiation (33) being directed towards said adhesive (4) on said thin plate (2); The method according to any one of claims 1 to 5, characterized in that

7. the radiation (33) impinges on the thin plate (2) or the starting material (1) at a right angle; The method according to any one of claims 1 to 6, characterized in that

8. the radiation (33) impinges on the sheet (2) or the starting material (1) at an angle (α) different from 90°; The method according to any one of claims 1 to 6, characterized in that

9. the adhesive (4) is irradiated in flight during application from an application device (39) to the sheet (2) or the starting material (1); The method according to any one of claims 1 to 5, characterized in that

10. said adhesive (4) being applied by means of at least one application roller (7); The method according to any one of claims 1 to 8, characterized in that

11. the adhesive pattern is applied using said application roller (7); The method of claim 10, wherein:

12. An apparatus for carrying out the method according to any one of claims 1 to 11, comprising:

1. An apparatus comprising at least one application device (7, 39) for applying an adhesive (4) onto a thin plate (2) which is irradiated by means of at least one radiation source (32), the radiation source (32) emits radiation in a wavelength range below the infrared range; An apparatus characterized by:

13. the wavelength range is located between 300 μm and 700 μm; 13. The device according to claim 12, wherein:

14. the radiation (33) of the radiation source (32) is directed towards the adhesive (4) on the thin plate (2) or on the starting material (1); 14. The device according to claim 12 or 13, characterized in that

15. the radiation (33) of the radiation source (32) is directed so that the radiation (33) strikes the adhesive (4) as it falls from an applicator (39) onto the thin plate (2); 14. The device according to claim 12 or 13, characterized in that

16. a diaphragm element (40) is located in the radiation path of the radiation source (32), the opening (41) of the diaphragm element (40) being preferably adjustable in terms of its cross section; 16. The device according to claim 15,

17. the applicator device (7) is an applicator roller rotatable about its axis, the outer cover (12) of said applicator roller being provided with at least one applicator opening (13) for said adhesive (4); The device according to any one of claims 12 to 16, characterized in that

18. The application opening (13) is configured in a screen shape; 18. The device according to claim 17, characterized in that

19. A cleaning roller (17) is disposed in contact with the application roller (7) and is axially parallel to the application roller (7); 19. The device according to claim 17 or 18, characterized in that

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