Method for producing a lamination stack

Abstract

The present invention relates to a method for manufacturing a laminated sheet group for forming a rotor or stator of an electric motor or generator, wherein laminated sheets that are not formed into a ring are punched out of a metal sheet strip and adhesive is applied to the laminated sheets by an applicator head, and the laminated sheets provided with adhesive are stacked into a laminated sheet group, wherein: the laminated sheets are punched out at a first position; the laminated sheets are conveyed to a second position next to the metal sheet strip and adhesive is applied at the second position; the laminated sheets are conveyed to a third position below the metal sheet strip; a next laminated sheet is punched out of the metal sheet strip at the height of the third position and the next laminated sheet is placed under pressure on the laminated sheet provided with adhesive at the third position; the partial group produced in this way is conveyed to a fourth position next to the metal sheet strip and adhesive is applied to the partial group at the fourth position; the partial group is conveyed to the first position, a next laminated sheet is punched out at the first position and the next laminated sheet is placed under pressure on the partial group below it; and the above steps are repeated until the laminated sheet group has a desired height.

Description

[0001] The present application is a divisional application based on the Chinese patent application with application number 201511036272.8, application date November 17, 2015, and invention name “Method for manufacturing a laminated stack and apparatus for performing the method”. Technical Field

[0002] The invention relates to a method for producing a laminated core. Background Art

[0003] It is known to stack laminations, for example, punched out of an endless strip, to form a lamination stack from which rotors or stators for electric motors or generators are produced. Within the lamination stack, the laminations are partially connected to one another by means of an adhesive which is applied to the laminations in a dot-shaped manner. Since the adhesive is usually applied to the laminations by means of piezo valves, a corresponding number of piezo valves is required. However, an application head with such piezo valves is therefore cost-intensive and correspondingly expensive.

[0004] It is also known that insulating varnishes, such as EB5350s, do not have reproducible chemical and physical properties with regard to their adhesive properties and / or the insulating surface is soiled or contaminated in the nanometer range, so that sufficient adhesion cannot be established between the adhesive and the insulating surface within the required time and / or there is no adhesion. Summary of the invention

[0005] The object of the present invention is to design a method of the generic type and a device of the generic type in such a way that a reproducible, strong bond between the laminations within a lamination package can be achieved in a simple manner without requiring complex shaping of the coating head.

[0006] According to the invention, this object is achieved for a method of this type with the features described below.

[0007] In the method according to the first scheme of the present invention, the lamination is formed into an annular shape. The lamination can be stamped out from a metal strip or a metal flat plate or made from a metal strip or a metal flat plate in other ways, especially by means of laser cutting. When applying the adhesive, the annular lamination is positioned in the region of the coating head so that the lamination is in the coating region of the coating head. During the application of the adhesive, the annular lamination is rotated around its axis. With this, the entire upper side region of the lamination reaches the coating region of the coating head. With this, the entire upper side of the annular lamination can be provided with adhesive in the entire surface when the structure of the coating head is relatively simple. Only a small amount of coating nozzles are needed in the coating head so that the annular lamination is provided with adhesive on its circumference. Depending on the requirements, it is also possible to only provide adhesive to a portion of the surface of the annular lamination.

[0008] The application of adhesive can also be carried out in the following manner, that is, the annular laminate is kept in a fixed position, and the coating head or a movable part of the coating head is moved along the circumference of the annular laminate, so that the adhesive can be applied over the entire circumferential area or only over a part of the circumferential area of ​​the laminate. Finally, not only the laminate but also the coating head can be rotated or moved around the axis of the laminate during the application of adhesive.

[0009] Advantageously, the lamination and / or the coating head are evenly rotated or moved. Thus, adhesive can be simply applied to the lamination area of ​​hope on the circumference of the annular lamination. For this reason, the control used to move the lamination and / or the coating head is correspondingly simple.

[0010] The core is rotated about its axis through a defined angle of rotation so that the annular surface of the core can be provided with adhesive over its entire circumference.

[0011] Advantageously, the application head or a movable part of the application head is also moved about the axis of the annular core through a defined rotation angle, so that adhesive can be applied to the top side of the core over the entire circumference of the core.

[0012] Advantageously, the annular upper and lower sides of the laminate are cleaned and / or activated before the adhesive is applied. For cleaning, known spraying methods such as compressed air spraying, CO2 spraying, snow spraying and / or plasma spraying or water cleaning can be used, whereby inorganic and / or organic contamination particles located on the surface of the laminate are reliably removed.

[0013] To activate the surface of the annular lamination, preferably known atmospheric pressure plasma methods can be used. For this purpose, the insulating layer of the silicon steel sheet is processed or changed in the nanometer range by chemical / physical reactions, thereby ensuring a precisely defined and efficient surface.

[0014] By means of the purification and / or activation, a reliable adhesion of the adhesive to the surface of the annular core is achieved.

[0015] Before punching out lamination, adhesive can be applied. In this case, the die of punching is designed like this, makes it not contact with adhesive.

[0016] But also can just apply adhesive after punching out the annular lamination.At this moment, do not need special punching die.

[0017] The method according to the second scheme of the present invention is suitable for laminations that do not form an annular shape. Therefore, the laminations can be formed into ring segments, and the ring segments are stacked into partial ring groups. Then, these partial ring groups are then assembled into annular groups. In the method, the laminations are punched at the first position. Then the laminations are transported to the second position in the area next to the metal sheet strip. In this second position, adhesive is applied to the upper side of the laminations. Then these laminations are transported to the third position below the metal sheet strip. At the height of this third position, the next lamination is punched out by the metal sheet strip, and the next lamination is then placed under pressure on the lamination provided with adhesive in this position. A partial group is produced by the previous step, in which the laminations overlapping each other are connected to each other by adhesive. The partial group is transported to the fourth position in the area next to the metal sheet strip, and adhesive is applied to the partial group in this fourth position. Then this partial group is transported back to the first position in the area below the metal sheet strip again. In the first position, the next lamination is punched out and pressed under pressure onto the subgroup located below it, which is provided with adhesive applied in the fourth position on its upper side. The laminations are punched out in sequence and stacked into a lamination stack until the stack has the desired height.

[0018] Advantageously, the adhesive is applied to the lamination layer in a contactless manner.

[0019] It is obvious that the adhesive can also be applied to the lamination in a contacting manner.

[0020] The adhesive can be applied in a planar, but also linear or dotted manner. To this end, only the corresponding application nozzles need to be opened correspondingly for a longer or shorter time and each application nozzle needs to be closed-loop controlled, open-loop controlled and monitored by a control device, such as an SPS control device, at a product-specific ratio to the feed speed.

[0021] Adhesive can be applied in such an amount that the area of ​​adhesive on the upper side of the laminate is at least approximately 50% of the total area of ​​the upper side of the laminate. Such a large proportion of adhesive leads to reliable connection of the laminates within the laminate stack. Such a large proportion of adhesive area determines that the coating head is not expensive to construct.

[0022] Advantageously, the surface proportion of the adhesive is greater than approximately 60% of the total surface of the lamination top side.

[0023] In the method according to the second aspect, the laminate may be formed, for example, in a T-shape.

[0024] In the method, the lamination stack is advantageously transported between the first position, the second position, the third position and the fourth position by means of a rotatable die.

[0025] Advantageously, the stack is always conveyed at 90° between the first position, the second position, the third position and the fourth position.

[0026] The method according to the invention can be used to reliably process thin workpieces, which are usually less than 1 mm thick. In particular, laminates of different qualities, thicknesses, properties and coatings can be processed. Even laminates of different qualities, thicknesses, properties and coatings can be used within a laminate stack.

[0027] In the device according to the invention, at least one location is provided downstream of the punching die for punching the laminate, in which the laminate is cleaned and / or activated and / or provided with adhesive. The device can have a separate location for each operation. However, it is also possible to carry out all three processes in a single location, i.e., cleaning, activation and application of adhesive. Since this location is not arranged inside the punching die, but outside the punching die, the punching die remains free of possible contaminants that may arise during cleaning and / or activation and / or application of adhesive.

[0028] In an advantageous embodiment, the device is designed such that the laminated sheets are stacked to form a laminated core not within the punching die but outside the punching die.

[0029] In an advantageous embodiment, the location for applying adhesive and / or for cleaning and / or for activation is provided with at least one coating device, which is arranged in the region of a rotating unit. The laminate is located on the rotating unit, which is used to rotate the laminate about its axis. The laminate is preferably annular in shape. The laminate is rotated about its axis below the coating device by means of the rotating unit. As a result, the laminate enters the working region of the coating device on its circumference, and the coating device can perform corresponding work.

[0030] In another advantageous embodiment, the laminate is stationary during the cleaning and / or activation and / or application of the adhesive. In this case, the coating device is designed so that it moves along the laminate. Even in this case, the laminate can be cleaned and / or activated and / or provided with adhesive over its entire length.

[0031] The technical solution of this application is given not only by the technical solution of each claim, but also by all the descriptions and features disclosed in the drawings and the specification. Even if they are not the technical solutions of the claims, as long as they are novel with respect to the prior art individually or in combination, they are important to the present invention and are required to be protected.

[0032] Further features of the invention can be gathered from the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be described in more detail with reference to several embodiments shown in the accompanying drawings. In the accompanying drawings:

[0034] Figure 1 A schematic diagram shows a notching device according to the present invention in a circular arrangement;

[0035] Figure 2 A third embodiment of a notching device in the form of a round notch according to the invention is shown schematically;

[0036] Figure 3 A third embodiment of a notching device in the form of a round notch according to the invention is shown schematically;

[0037] Figure 4 Another embodiment of the notching device according to the present invention in a linear arrangement is shown in a schematic diagram;

[0038] Figure 5 Another embodiment of the notching device according to the present invention in a linear arrangement is shown in a schematic diagram;

[0039] Figure 6 Another embodiment of the notching device according to the present invention in a linear arrangement is shown in a schematic diagram;

[0040] Figure 7 Another embodiment of a fast rotor press according to the present invention in a linear arrangement is shown in a schematic diagram;

[0041] Figure 8 A schematic diagram shows a second embodiment of a fast rotor press according to the linear arrangement structure of the present invention;

[0042] Fig. 9 A third embodiment of a fast rotor press in a linear arrangement according to the present invention is shown in a schematic diagram;

[0043] Fig.10 A schematic diagram shows a device according to the invention for applying adhesive with a cleaning station and an activation station;

[0044] Fig.11 An adhesive application is shown wherein the metal sheet is rotated;

[0045] Fig.12 shows adhesive application by means of a rotating device;

[0046] Fig.13 The adhesive application is shown by means of a device with a rotating unit;

[0047] Fig.14An embodiment of a unit according to the invention for applying adhesive to a rotating metal plate is shown in a schematic top view and a side view;

[0048] Fig.15 An embodiment of a unit according to the invention for applying adhesive by means of a device with a rotation unit is shown in a schematic top view and a side view;

[0049] Fig.16 and 17 Another embodiment of the unit for applying adhesive according to the invention is shown in schematic diagrams. DETAILED DESCRIPTION

[0050] In the following, it will be explained on the basis of various exemplary embodiments how laminates stacked one above the other can be firmly connected to one another within a laminate stack by means of at least one adhesive. The devices and apparatus used are designed here so that the individual laminates have a relatively large bonding surface area share, which is, for example, greater than approximately 60% of the total laminate surface area. The adhesive can be applied to the respective laminate in the form of dots, lines or also in the form of a surface. In this case, the device used for applying the adhesive over such a large area is distinguished by a very simple and space-saving design.

[0051] Figure 1 The schematic diagram shows a notching device in a circular arrangement as an example. The device has a first position 1 in which a stack of laminations 2 in the form of circular metal plates is stored. The laminations 2 are brought to a second position 3 by a conveyor system 10, in which the laminations 2 are aligned for further processing. The aligned laminations 2 are brought to a third position 4 by a conveyor system. Here, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out of the circular metal plate 2 in a known manner. The metal plates 5, 6 are then cleaned and coated with adhesive by a device 7.

[0052] The outer stator metal sheets 5 are fed to a fourth position 8 by a conveyor system, where the stator metal sheets 5 are stacked to form a stator stack. The stator metal sheets 5 stacked one above the other are held together by adhesive. The individual annular stator metal sheets 5 are aligned before stacking, so that the resulting stator stack has the same axial height on its circumference.

[0053] The annular rotor metal plates 6 are fed to a fifth station 9 by means of a conveying system 10, in which the annular rotor metal plates 6 are stacked to form a rotor group. Before being stacked one on top of the other, the rotor metal plates 6 are aligned so that the rotor group has the same axial thickness over its circumference. The rotor metal plates stacked one on top of the other are securely held together by the adhesive applied in station 4.

[0054] In the present exemplary embodiment, the positions 1 , 3 , 4 , 8 , 9 are arranged on a circle around the conveyor system 10 .

[0055] according to Figure 2 The notching device is also designed in a circular arrangement, that is, the individual positions are located on a circle around a centrally arranged conveying system. The notching device is designed essentially the same as the above-described exemplary embodiment. In position 1, a round metal plate 2 is stored. From there, the round metal plate is supplied by means of a conveying system 10 to a second position 3, in which the round metal plate 2 is aligned. In a third position 4, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out of the round metal plate 2.

[0056] The metal plates 5 , 6 are fed by means of a conveyor system 10 to a fourth station 4 a in which they are cleaned and in which adhesive is applied to them.

[0057] In the subsequent fifth position 8 , the stator metal sheets 5 are aligned in the manner described and assembled to form a stator assembly. In the subsequent sixth position 9 , the annular rotor metal sheets 6 are aligned in the manner described and assembled to form a rotor assembly.

[0058] according to Figure 3 The notching device is also designed in a circular arrangement, that is, the individual positions are located on a circle around a centrally arranged conveying system 10. The notching device is designed essentially the same as the above-described exemplary embodiments. In position 1, a round metal plate 2 is stored. From there, the round metal plate is supplied by means of a conveying system 10 to a second position 3, in which the round metal plate 2 is aligned. In a third position 4, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out of the round metal plate 2.

[0059] The metal sheets 5, 6 are fed to a fourth position 4b by means of a conveyor system 10, in which the metal sheets are cleaned and in which adhesive is applied to the metal sheets. In the present exemplary embodiment, the cleaning and / or activation nozzles and the adhesive application valves are moved around the metal sheets 5, 6 by means of a movable device unit 27 in a fixed device unit 7.

[0060] In the subsequent fifth position 8 , the stator metal sheets 5 are aligned in the manner described and assembled to form a stator assembly. In the subsequent sixth position 9 , the annular rotor metal sheets 6 are aligned in the manner described and assembled to form a rotor assembly.

[0061] Unlike the first embodiment, the stamping of the two metal sheets 5, 6 and the cleaning and adhesive application are performed at two locations 4, 4a ( Figure 2 ) or 4, 4b( Figure 3 ). Figure 1 In the embodiment of FIG. 4 , the punching process, cleaning and adhesive application take place in only one single location 4 .

[0062] In accordance with Figure 4 In the embodiment of the present invention, the individual positions of the notching devices are arranged in a linear structure, that is, they are arranged side by side along a linear conveyor system 10. In this embodiment, annular round metal plates 2 are also used as raw materials for the stator metal plates 5 and the rotor metal plates 6. They are either cut from metal plates by means of laser or punched out from endless metal plates in a known manner. This also applies to the process according to Figure 1 , 2 The circular metal plate 2 used in the notching device of the present invention is shown in Figure 3. Since it is known that a circular metal plate is cut from a metal plate by means of a laser or is punched out from an endless metal plate, it will not be described in detail.

[0063] Round metal plates 2 are also stored in the first position 1. The round metal plates 2 are supplied to the second position 3 by means of the conveying system 10, in which the round metal plates 2 are aligned. The aligned round metal plates 2 are then brought to the third position 4 by means of the conveying system 10, in which they are transported similarly to the method described above. Figure 1 According to an embodiment of the present invention, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out from a circular metal plate 2. Subsequently, the two metal plates 5, 6 are cleaned and coated with adhesive by a device 7.

[0064] In the subsequent position 8, the annular stator metal sheets 5 are stacked to form a stator stack. For this purpose, a joining unit 12 is provided, with which the annular stator metal sheets 5 are aligned and stacked to form a stator stack. The adhesive ensures that the stator metal sheets 5 are firmly connected to each other in the stator stack. Since the stator metal sheets are aligned before stacking, the stator stack has the same axial height on its circumference.

[0065] The annular rotor metal plates 6 are supplied by means of a conveying system 10 to a position 9 where they are stacked to form a rotor stack by means of a joining unit 13. Before the rotor metal plates 6 are stacked one above the other, they are aligned so that the resulting rotor stack has the same axial height over its circumference. The stacked rotor metal plates 6 are firmly connected to one another within the rotor stack by means of an adhesive.

[0066] according to Figure 5The notching device of the embodiment of the present invention is also designed in a linear manner and has a linear conveyor system 10, along which the individual positions are arranged next to each other in a linear arrangement. Round metal plates 2 are also stored in the first position 1. The round metal plates 2 are supplied to the second position 3 by means of the conveyor system 10, in which the round metal plates 2 are aligned. The aligned round metal plates 2 are then brought to the third position 4 by means of the conveyor system 10, in which they are similarly arranged according to the embodiment of the present invention. Figure 2 In the embodiment of the present invention, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out from a round metal plate 2. The punched metal plates 5, 6 are then supplied to a position 4a by means of a conveying system 10, where the metal plates 5, 6 are cleaned and activated. Then, adhesive application is performed.

[0067] In the subsequent position 8, the annular stator metal sheets 5 are stacked to form a stator stack. For this purpose, a joining unit 12 is provided, with which the annular stator metal sheets 5 are aligned and stacked to form a stator stack. The adhesive ensures that the stator metal sheets 5 are firmly connected to each other within the stator stack. Since the stator metal sheets 5 are aligned before stacking, the stator stack has the same axial height on its circumference.

[0068] The annular rotor metal plates 6 are supplied to a position 9 by means of a conveying system 10, where they are stacked to form a rotor stack by means of a joining unit 13. Before the rotor metal plates 6 are stacked one on top of the other, they are aligned so that the resulting rotor stack has the same axial height over its circumference. The rotor metal plates 6 stacked one on top of the other are firmly connected to one another within the rotor stack by means of an adhesive.

[0069] according to Figure 6 The notching device of is also designed in a linear manner, wherein the individual positions are arranged next to one another along a linear conveyor system 10. Round metal plates 2 are also stored in the first position 1. The round metal plates 2 are supplied to the second position 3 by means of the conveyor system 10, in which the round metal plates 2 are aligned. The aligned round metal plates 2 are then brought to the third position 4 by means of the conveyor system 10, in which they are similarly arranged according to Figure 3 In the embodiment of the present invention, an annular stator metal plate 5 and an annular rotor metal plate 6 are punched out from a round metal plate 2. The punched metal plates are then supplied to a position 4b by means of a conveying system 10, where the metal plates 5, 6 are cleaned and activated. Then, adhesive application is performed.

[0070] In the subsequent position 8, the annular stator metal sheets 5 are stacked to form a stator stack. For this purpose, a joining unit 12 is provided, by means of which the annular stator metal sheets 5 are aligned and stacked to form a stator stack. The adhesive ensures that the stator metal sheets 5 are firmly connected to each other in the stator stack. Since the stator metal sheets 5 are aligned before stacking, the stator stack has the same axial height on its circumference.

[0071] The annular rotor metal plates 6 are supplied to a position 9 by means of a conveying system 10, where they are stacked to form a rotor stack by means of a joining unit 13. Before the rotor metal plates 6 are stacked one on top of the other, they are aligned so that the resulting rotor stack has the same axial height over its circumference. The rotor metal plates 6 stacked one on top of the other are firmly connected to one another within the rotor stack by means of an adhesive.

[0072] Figure 7 The schematic diagram shows a fast rotor press concept in a workspace as an example. The workspace has a first position 4b, in which a silicon steel strip 19 is cleaned, activated and adhesive is applied to the strip 19 by means of a coating device 7 in embodiment variant 4b. In the subsequent second position 4, circular metal plates 5, 6 are punched out of the metal sheet. The punching process will not be described in detail, as it is known.

[0073] In the subsequent position 8, the annular stator metal sheets 5 are stacked to form a stator stack. For this purpose, a joining unit 12 is provided, with which the annular stator metal sheets 5 are aligned and stacked to form a stator stack. The adhesive ensures that the stator metal sheets 5 are firmly connected to each other within the stator stack. Since the stator metal sheets are aligned before stacking, the stator stack has the same axial height on its circumference.

[0074] The annular rotor metal plates 6 are supplied to a position 9 by means of a conveying system 10, where they are stacked to form a rotor stack by means of a joining unit 13. Before the rotor metal plates 6 are stacked one on top of the other, they are aligned so that the resulting rotor stack has the same axial height over its circumference. The rotor metal plates 6 stacked one on top of the other are firmly connected to one another within the rotor stack by means of an adhesive.

[0075] The conveying system 10 is arranged perpendicular to the conveying direction of the silicon steel strip 19. The positions 4, 8, and 9 are arranged along the conveying system 10.

[0076] according to Figure 8The fast rotor press device of the invention also shows a fast rotor press scheme inside the workspace by means of a schematic diagram as an example. The workspace has a first position 4, in which metal plates 5 and 6 are punched out from a silicon steel strip 19. In the second position 4a, the metal plates 5 and 6 are cleaned and activated by means of a coating device 7, and an adhesive is applied to the laminated sheets 5 and 6. In the subsequent position 8, the annular stator metal plates 5 are stacked into a stator group. For this purpose, a joining unit 12 is provided, by which the annular stator metal plates 5 are aligned and stacked into a stator group. The adhesive ensures that the stator metal plates 5 are firmly connected to each other within the stator group. Because the stator metal plates are aligned before stacking, the stator group has the same axial height on its circumference.

[0077] In the subsequent position 9, the annular rotor metal plates 6 are stacked to form a rotor group by means of a joining unit 13. They are aligned before assembly so that the resulting rotor group has the same axial height over its circumference. The rotor metal plates 6 stacked one above the other are firmly connected to each other by means of an adhesive.

[0078] The positions 4, 4a, 8, 9 are arranged one after another in a straight line, so that the metal plates 5, 6 can be supplied to each position by means of the linear conveyor system 10. According to the above embodiment, the silicon steel strip 19 is supplied perpendicularly to the conveying direction of the conveyor system 10.

[0079] according to Fig. 9 The fast rotor press device of the invention also shows a fast rotor press scheme inside the working space by means of a schematic diagram as an example. The working space has a first position 4, in which metal plates 5 and 6 are punched out from a silicon steel strip 19. In the subsequent position 4b, the metal plates 5 and 6 are cleaned and activated by means of a coating device 7, and an adhesive is applied to the metal plates 5 and 6. In the subsequent position 8, the annular stator metal plates 5 are stacked into a stator group. For this purpose, a joining unit 12 is provided, by which the annular stator metal plates 5 are aligned and stacked into a stator group. The adhesive ensures that the stator metal plates 5 are firmly connected to each other within the stator group. Because the stator metal plates are aligned before stacking, the stator group has the same axial height on its circumference.

[0080] The annular rotor metal plates 6 are supplied to a position 9 by means of a conveying system 10, where they are stacked to form a rotor stack by means of a joining unit 13. Before the rotor metal plates 6 are stacked one above the other, they are aligned so that the resulting rotor stack has the same axial height over its circumference. The rotor metal plates 6 stacked one above the other are firmly connected to one another within the rotor stack by means of an adhesive.

[0081] In this embodiment, the positions 4, 4b, 8, and 9 are also arranged successively along the linear conveying system 10. The conveying direction of the conveying system 10 is perpendicular to the conveying direction of the silicon steel strip 19.

[0082] Fig.10 An embodiment of a device 7 is shown, with which adhesive can be applied to the stator metal sheets 5 and to the rotor metal sheets 6. The device 7 is Figure 1 and 4 In the embodiment of the present invention, it is used in position 4, and in accordance with Figure 2 , 3 , 5, 6, 7, 8 and 9 are used in position 4a or 4b.

[0083] The device 7 has at least one cleaning nozzle 14 which is arranged such that the cleaning medium emerging from it is sprayed onto the upper side of the stator metal sheet 5 or the rotor metal sheet 6. In the present exemplary embodiment, two such cleaning nozzles are provided which are arranged adjacent to each other at a distance.

[0084] In addition, the device 7 is provided with at least one activation nozzle 15, from which the atmospheric pressure plasma emerges. In the present embodiment, two such activation nozzles 15 are provided, which are directed toward the upper side of the metal plates 5, 6. The two activation nozzles 15 are also arranged side by side with a spacing and next to the cleaning nozzle 14 with a spacing.

[0085] Finally, the device 7 is provided with at least one coating nozzle 16, through which the adhesive is applied to the metal sheets 5, 6. In the embodiment shown, the device 7 has two such coating nozzles 16 arranged side by side with a distance. In addition, the coating nozzle 16 is spaced apart from the activation nozzle 15.

[0086] For cleaning, activation and application of adhesive, the metal plates 5, 6 are rotated under the device 7. The metal plates 5, 6 are rotated clockwise around the central axis 17 in the direction of the arrow by means of a suitable rotating unit. The nozzles 14 to 16 of the device 7 are arranged in such a way that they always deflect the medium towards the metal plates when the metal plates 5, 6 are rotated. The device 7 and the rotating unit for the metal plates 5, 6 are arranged relative to each other in such a way that the nozzles 14 to 16 are always in the area of ​​the metal plates 5, 6 when the metal plates 5, 6 are rotated. Accordingly, the nozzles 14 to 16 are arranged on the device 7 in such a way that the medium coming out of these nozzles is sprayed onto the rotating metal plates 5, 6 over the entire circumference of the metal plates. In the illustrated embodiment, the nozzles 14 to 16 are always arranged in a row side by side and overlap one another, wherein the nozzles are each spaced apart from one another.

[0087] The nozzles are arranged in such a way that, when the metal plates 5, 6 are rotated, the cleaning medium that first emerges from the cleaning nozzles 14 cleans the upper side of the metal plates 5, 6. For example, CO2 spraying or snow spraying can be used as the cleaning medium.

[0088] After the cleaning, the surface of the metal plates 5, 6 is cleaned further and activated by the nozzle 15 so that the adhesive to be applied subsequently adheres reliably to the metal plates 5, 6. As a cleaning and activation medium, atmospheric pressure plasma is considered, for example. In the example, the double cleaning ensures that the surface of the metal plates 5, 6 is perfectly cleaned and activated by the subsequent activation so that good adhesion of the adhesive to the metal plates 5, 6 is guaranteed. In this way, the adhesive coming out of the nozzle 16 reaches the cleaned and activated surface when the metal plates 5, 6 are rotated, and the adhesive adheres reliably to this surface.

[0089] Since the metal plates 5, 6 rotate under the device 7 or its nozzles 14 to 16, only a small number of nozzles are sufficient to provide a sufficient amount of adhesive to the metal plates 5, 6 over the entire circumference. It is easy to apply adhesive to such an area that the adhesive area is, for example, greater than 60% of the entire upper side area of ​​the laminate 5, 6. In this way, the metal plates 5, 6 are very firmly connected to each other by means of adhesive within each laminate group. When the metal plates 5, 6 rotate, the adhesive can be applied continuously, so that it is possible to wet the upper side of the metal plates 5, 6 with the adhesive. Since only two nozzles 16 are needed for this purpose in the present embodiment, the technical expenditure for applying the adhesive on the surface is very small. In particular, only two valves, preferably piezoelectric valves, are needed, with which the adhesive can be applied to the metal plates 5, 6 in a targeted manner.

[0090] The adhesive does not have to be applied to the metal plates 5, 6 in a planar manner over the entire circumference. It is absolutely possible to provide a planar adhesive application only in individual sections on the upper side of the metal plates 5, 6. The valve provided for applying the adhesive is controlled by a corresponding control device so that the adhesive is applied in a desired manner.

[0091] The nozzles 16 can also be arranged in such a way that the adhesive is not sprayed onto the upper sides of the metal sheets 5 , 6 in a flat manner, but, for example, only in point or line form.

[0092] The medium for cleaning and activating the bottom and top of the metal plates 5 , 6 emerging from the nozzles 14 and 15 is advantageously applied to the entire surface of the bottom and top of the metal plates 5 , 6 , so that the entire top of the metal plates 5 , 6 is perfectly cleaned and activated for the subsequent application of adhesive.

[0093] Fig.16The possibility of providing a large-area adhesive coating is shown not only for annular metal sheets but also for T-shaped metal sheet segments 18. These are punched out of a metal sheet strip 19 in a known manner. In a first position 20, the segment 18 is punched out of the metal sheet strip 19 and then lies in a rotatable die 21. The die can be rotated about a central axis 22, which, when viewed in a plan view of the metal sheet strip 19, extends through half the width of the metal sheet strip 19. The rotatable die 21 is located in a die lower part 23 as a component of a punching machine.

[0094] In the present exemplary embodiment, after the punching process, the die 21 is rotated 90° in the clockwise direction, so that the T-shaped section 18 is brought into the second position 24 in the area next to the sheet metal strip 19. During the rotation from the first position 20 to the second position 24 and / or from the third position 25 to the fourth position 26, the sheet metal surface is moved past the integrated cleaning and / or activation nozzles 14, 16 and thereby cleaned and modified. They are schematically shown in FIG. Fig.16 In this way, the segment 18 that has been punched out and is located in the die 21 is located outside the metal sheet strip 19. In the second position 24, the adhesive is applied to the segment 18. For this purpose, it can be considered again for the sake of clarity. Fig. 9 Since the segments are T-shaped, in this embodiment corresponding nozzles are arranged on the device so that the segments 18 can be cleaned, activated if necessary, and provided with adhesive on their upper side, which adhesive can be applied in a flat, spot or linear manner, as in accordance with Fig.10 The embodiments have been described as examples.

[0095] While the adhesive is being applied to the punched-out segment 18 in the second position 24 , the next segment 18 is simultaneously being punched out of the sheet metal strip 19 in the first position 20 .

[0096] The die 21 is then rotated again by 90° about its axis 22 in the clockwise direction. As a result, the segment provided with adhesive on its upper side is brought into the third position 25 again in the area below the sheet metal strip 19. In this third position, the next segment 18 is punched out of the sheet metal strip 19. This next segment is rotated by 180° relative to the segment 18 punched out of the sheet metal strip 19 in the first position. Since the die 21 is accordingly rotated by 90°, the segment 18 provided with adhesive is located congruently below the segment 18 punched out in the third position 25 when viewed from above on the sheet metal strip 19. It therefore reaches above the segment 18 provided with adhesive in the die 21.

[0097] The die 21 is now rotated again by 90° in the clockwise direction, so that the two segments 18 which are one above the other and which are connected to each other by adhesive are brought into the region of the fourth position 26. The two segments 18 which are one above the other are rotated by 180° in this case relative to their position in the opposite second position 24. In the fourth position 26, the segments 18 are again in the region next to the sheet metal strip 19. In the fourth position 26, adhesive is again applied to the upper segment 18, for example over the entire surface or part of the surface, in the form of lines or in spots.

[0098] In this final fourth position 26, the segments 18 are stacked to form a laminated core. In this case, in the manner described, two segments are placed one above the other and connected to one another by adhesive onto the laminated core already formed in the fourth position 26. In this way, a segment or laminated core is produced in the fourth position 26 in which the segments 18 are firmly connected to one another by means of adhesive.

[0099] In accordance with Fig.16 In the device, the described operations take place simultaneously at all four positions. In the two second positions 24 and fourth positions 26, which are located on opposite sides of the sheet metal strip 19, the devices for applying adhesive are located above the segments 18. This results in a very compact device design compared to conventional devices, in which the adhesive application unit is located in the area in front of the respective mold.

[0100] Fig.17 The possibility of applying adhesive to the annular metal sheets 5, 6 in the die by means of a rotating element 27 in a coating device 28 is shown. This coating device 28 is located next to the die bottom part 23. The metal sheets are punched out of the metal sheet strip 19 in a known manner. In order to apply the adhesive to the silicon steel strip and to ensure the previous purification and activation, the adhesive is applied to the silicon steel strip located thereunder by means of the rotating element 27. Here, the element 27 rotates about an axis of rotation 29 which, when viewed in a plan view of the metal sheet strip 19, extends within half the width of the metal sheet strip and perpendicular to the metal sheet strip. The annular metal sheets 5, 6 are punched out of the metal sheet strip 19 and grouped in a known manner. Similar to the method described with reference to the method according to Fig.10 As has already been explained, the coating device 28 has at least one coating nozzle 16 from which adhesive emerges during the rotation of the element 27. The nozzle 16 is operated by a control device so that the adhesive is applied to the upper side of the annular metal plate over the entire surface, part of the surface, in the form of lines, dots, etc. Fig.10 Unlike the device of , in the device 28, the element 27 is driven to rotate or rotate, while the annular metal plates 5, 6 are fixed in position. The movable device part 27 can be driven by a controlled electric motor 33 preferably through a V-belt 32.

[0101] Reference Figures 11 to 12 Different adhesive applications are described.

[0102] In accordance with Fig.11 In the method, the annular metal plates 5, 6 are rotated downwardly in the device 7, as shown in reference Fig.10 As has been explained. The adhesive application is indicated by the dotted line 30. The dotted line 30 should not be understood as a linear adhesive application, but should indicate that the adhesive is applied by the 360° rotation of the metal plates 5, 6. The adhesive application can be full-surface, partial-surface, linear, dot-shaped, etc. Here, these different types of adhesive applications on the upper side of the metal plates 5, 6 can also be combined. For example, it is conceivable that the partial-surface adhesive application is carried out at intervals along the circumference of the metal plates 5, 6, and these partial surfaces are connected to each other by the adhesive applied in a linear manner. In this way, the adhesive application can be very simply coordinated according to the corresponding requirements.

[0103] Fig.12 The possibility of moving the device 7 along the circumference of the metal plates 5, 6 instead of the annular metal plates 5, 6 is shown. Here, the adhesive is applied to the circumference of the respective metal plates 5, 6, which is indicated by the dashed line 30. Fig.11 As explained above, the dotted line 30 does not represent a linear application of adhesive. As explained with reference to the various embodiments, depending on the application, adhesive is applied to the upper side of the annular metal plates 5, 6 over the entire surface, over a portion of the surface, in a linear or spot manner or in a combination of different adhesive applications.

[0104] Fig.13 Finally, it is shown that when the Figure 3 , 6 , 7 and 9. Here, the annular metal plates 5, 6 and the silicon steel strip 19 are preferably stationary, while the rotating element 27 rotates up to 360°. Here, the adhesive is applied to the circumference of the annular metal plates 5, 6. The adhesive application is again shown by the dotted line 30. The adhesive application can be carried out on the entire surface, on a part of the surface, in a line, in a spot or in a combination of these different coating processes. As shown in the exemplary reference Fig.10 As already explained, the rotating element 27 can have nozzles 14 to 16 for cleaning, optionally activating the annular metal plates 5, 6 and for applying adhesive. The nozzles are valve-controlled, wherein the valves are connected to a control device, by means of which the valves can be actuated in a desired manner.

[0105] Depending on the radial width of the annular metal plates 5, 6, only one type of nozzle 14, 15, 16 can also be provided accordingly. It is also possible to use more than two cleaning nozzles 14, activation nozzles 15 and coating nozzles 16. It is also possible to provide different nozzles 14, 15, 16 in different numbers. The different nozzles 14 to 16 are operated independently of each other by the control device. Advantageously, when two or more nozzles are provided for each nozzle type, it is also preferred that the nozzles of the same type are operated independently of each other by the control device. In this way, the area on the upper side of the annular metal plates 5, 6 can be cleaned and / or activated and / or provided with adhesive in a targeted manner.

[0106] In various embodiments, the corresponding sheet metal groups are assembled in a die 21. The die has a brake in a known manner, which applies a braking force to the group. The braking force is so great that when the corresponding last sheet metal plate 5, 6 or the last segment 18 is pressed onto the already formed part of the group, a reliable adhesion of the underlying sheet metal plates 5, 6, 18 is ensured. For this purpose, the sheet metal parts 5, 6, 18 are pressed onto the already stacked sheet metal parts by a punch. For example, the brake can be formed by a partial ring, the inner diameter of which is slightly smaller than the outer diameter of the stamped sheet metal plates 5, 6. If T-segments 18 are stacked, the receiving space for these segments is formed in such a way that their outer dimensions are also slightly smaller than the outer dimensions of the T-segments 18, thereby also braking the correspondingly formed segment group.

[0107] When the desired group height is reached, the supply of adhesive is interrupted, i.e. the valve of the corresponding application nozzle 16 is closed, so that no adhesive is applied to the corresponding annular metal sheet 5, 6 or segment 18. For this purpose, these metal sheet parts 5, 6, 18 do not adhere to the previous metal sheet or, depending on the configuration of the device, to the next metal sheet. In this way, the desired group height is determined.

[0108] In the case of the annular metal plates 5, 6, at position 8 ( Figures 1 to 4 ) and in accordance with Figure 3 In the embodiment of the invention, in position 9, an alignment process of the annular metal plates 5, 6 is carried out. Here, the annular metal plates 5, 6 are rotated about their longitudinal axis in such a way that the group formed in the die has a constant height on its circumference. For this alignment process, the die together with the brake is rotated about its longitudinal axis, for example by means of a wheel-belt drive, so that the group in the die is rotated by a corresponding angle. The rotation is carried out before the next annular metal sheet part 5, 6 is pressed against the partial group in the die in the brake. Since the connection between the metal sheet parts 5, 6 that overlap each other is only carried out by adhesive, the rotation angle of the die can be optimally matched to the use of the metal sheet group to be manufactured. Various rotation angles are possible here, because there are no physical restrictions on how to adapt the metal sheet parts to each other.

[0109] In accordance with Fig.16 In the embodiment of the invention, the thickness of the partial group or the entire group formed by the segments 18 can be measured in the first position 24 and the fourth position 26 on both sides of the metal sheet strip 19. The group height can thus be determined very accurately, since the height of the respectively formed partial group can be detected directly in these positions. In the known methods, the strip thickness or the number of segments in the partial group is detected for indirect determination of the group height, which can only lead to inaccurate group height measurements, whereas in the method according to Fig.16 In an embodiment of the invention, the corresponding group height is measured directly. This results in a very accurate determination of the group height.

[0110] Since the adhesive content on the upper side of the sheet metal parts 5, 6, 18 is significantly greater than half of the upper side area of ​​these sheet metal parts, the sheet metal parts 5, 6 that overlap one another in the group are perfectly firmly connected to one another. Therefore, these groups can also be used in the case of electric motors or generators operating at high speeds.

[0111] In the embodiments described and shown, the stator metal sheet 5 and the rotor metal sheet 6 are formed by a one-piece ring. However, it is also possible to assemble the ring-shaped stator metal sheet or rotor metal sheet 6 from a number of individual segments. In this case, the individual segments themselves are punched out and stacked into groups, which are then joined into a ring-shaped stator group or rotor group.

[0112] In accordance with Figures 1 to 5 In the embodiment of the present invention, the adhesive is applied as soon as the annular sheet metal parts 5, 6 or the device 7 are rotated about a common axis of rotation, as is shown in the example of Figures 11 to 13 as shown in .

[0113] For dispensing the adhesive, various valve systems can be used, by means of which the adhesive can be reliably applied to the sheet metal parts 5, 6, 18. Advantageously, valve systems based on piezo technology are used. The use of piezo valves can ensure precise adhesive application.

[0114] The adhesive can be applied to the top side of the respective sheet metal part 5 , 6 , 18 without contact, but also with contact.

[0115] In a preferred embodiment, different nozzles 14 to 16 ( Fig.10). This results in a particularly simple and compact design of the device 7. In addition, the application nozzle 16 can be arranged on a separate device, for example, which is arranged spatially separately from the nozzles 14 and 15 on the device. This reliably prevents the adhesive application from being disturbed by the purification medium and / or the activation medium. Thus, for example, such a separate device having only the at least one application nozzle 16 can be arranged at 90° or 180° relative to the device which only still contains the nozzles 14, 15. The annular metal plate parts 5, 6 are then rotated in such a way that the desired adhesive application is intentionally carried out on the circumference of these metal plates 5, 6.

[0116] Fig.14 Such a single device 7 is shown by way of example. The device has a cleaning nozzle 14, an activation nozzle 15 and a coating nozzle 16, which are each present in pairs. The configuration of the device 7 corresponds to that described with reference to Fig.10 The nozzles are arranged in pairs, in rows, side by side and one after the other. The device 7 has a frame 34 from which an arm 35 projects transversely, on which the nozzles 14 to 16 are arranged.

[0117] The nozzles 14 to 16 point downwardly toward the metal sheets 5, 6, which can be rotated about a vertical axis by means of a drive unit 33. The metal sheets 5, 6 are located on a circular table 36, which is rotated about its axis by means of the drive unit 33. The nozzles 14 to 16 are arranged in such a way that the adhesive can be applied to the circumference of the metal sheet parts 5, 6 as they rotate.

[0118] Advantageously, the distance between the nozzles 14 to 16 and the metal plates 5 , 6 can be designed to be adjustable. This is possible, for example, by adjusting the nozzles 14 to 16 themselves relative to the arm 35 or by adjusting the arm 35 together with the nozzles 14 to 16 .

[0119] Fig.15 An embodiment is schematically shown in which the annular metal plates 5, 6 are not rotated, but the device 7 is rotated about a vertical axis. The device 7 has a support device 37 located above the circular worktable 36 with a spacing, and the drive unit 33 extends centrally from the support device toward the circular worktable 36. The drive unit 33 carries an arm 38, which extends radially from the drive unit 33 and carries the rotating element 27 at the free end. The nozzles 14 to 16 are arranged on it. The element 27 is moved around by the drive unit 33 so that the annular metal plates 5, 6 located on the circular worktable 36 can be cleaned, activated and provided with adhesive in the described manner. It is also advantageous in this embodiment that the distance between the nozzles 14 to 16 and the metal plates 5, 6 can also be adjusted, either by adjusting the nozzles or by adjusting the element 27.

Claims

1. A method for producing a lamination stack for forming a rotor or stator of an electric motor or generator, wherein: Punching laminations from sheet metal strips, which are not formed into annular shapes, applying at least one adhesive to the laminations using at least one application head, and stacking the laminations provided with adhesive to form a lamination stack, characterized in that: a) punching the laminations in a first position (20), b) conveying the laminate to a second position (24) next to the sheet metal strip (19) in which adhesive is applied, c) subsequently conveying the stack to a third position (25) below the sheet metal strip (19), d) punching out a next laminate from the sheet metal strip (19) at the height of the third position (25), placing the next laminate under pressure in the third position (25) on the laminate provided with the adhesive, e) conveying the partial groups produced in step d) to a fourth position (26) next to the sheet metal strip (19), in which adhesive is applied to the partial groups, f) subsequently conveying the partial group to a first position (20), in which the next laminate is punched out and placed under pressure onto the partial group located below it, g) Method steps a) to f) are then repeated until the laminated core has the desired height.

2. The method according to claim 1, characterized in that The laminate is cleaned and / or activated prior to application of the adhesive.

3. The method according to claim 1 or 2, characterized in that: The adhesive is applied to the laminate without contact.

4. The method according to claim 1 or 2, characterized in that: The adhesive is applied to the laminate in the form of surfaces, dots or lines.

5. The method according to claim 1 or 2, characterized in that: The adhesive is applied in such an amount that the area of ​​the adhesive on the top side of the laminate is at least 50% of the total area of ​​the top side of the laminate.

6. The method according to claim 5, characterized in that The adhesive area is greater than 60% of the total area of ​​the upper side of the laminate.

7. The method according to claim 1 or 2, characterized in that: The laminations are formed into a T-shape.

8. The method according to claim 1 or 2, characterized in that: The laminate is transported between a first position (20), a second position (24), a third position (25) and a fourth position (26) by means of a rotatable die (21).

9. The method according to claim 1 or 2, characterized in that: The sheet stack is conveyed at defined, product-specific turning angles between a first position (20), a second position (24), a third position (25) and a fourth position (26).

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