Method and device for producing a laminate group from a plate of plates

Abstract

The invention relates to a method for producing a laminated core (2) from a plurality of sheets (1), in which an adhesive medium is applied as at least one adhesive point (22) by means of an application unit (35) by means of an application head (32) on the upper side of the surface of a sheet insulation (21) of a sheet strip (5) guided horizontally with respect to the direction of gravity. The advantage of this structure and function is that the adhesive medium is transferred in the form of at least one adhesive point (22) onto the surface of the sheet insulation (21) of the sheet strip (5) or onto the surface of the sheet (1) cut from the sheet strip without the presence of a movable component in the application head (32), the applicator head (32) moves vertically with respect to the surface of the plate strip (5) in order to transfer the adhesive medium in the form of at least one adhesive point (22).

Description

[0001] The invention relates to a method for producing a laminated core from a plurality of sheet metal sheets, wherein an adhesive medium is applied as at least one adhesive point by means of an application unit via an application head to the upper side of the surface of a sheet metal insulation of a sheet metal strip guided horizontally relative to the direction of gravity. The invention also relates to a device having an application unit for producing a laminated core from a plurality of sheet metal sheets, the device having an application head, at least one dispenser for the adhesive medium and a frame for accommodating one or more dispensers and at least one application head, the dispenser having at least one input for the adhesive medium.

[0002] Document EP 1 833 145 B1 discloses such a method and such a device.

[0003] The lamination stack composed of plates for electric motors (electric motors, generators) is economically manufactured by a punching process. Here, the coil on the reel whose magnetic properties, insulating layer and width are already adapted to the lamination stack to be produced is fed into the punching machine. The correction unit is usually arranged after the reel. The feeding system located at the punching machine gradually conveys the sheet strip of the coil to the punching tool located in the punching machine. The step length is also adapted to the lamination stack to be manufactured. In the punching machine, the punching tool gradually produces the inner contour of the plate. After the inner contour is manufactured, the plate is punched out from the sheet strip of the coil by a punch and transferred to a so-called punching die. In order to manufacture the lamination stack, the plates are connected in the punching die to form the lamination stack. The lamination stack grows with each working stroke of the punching machine. There is a lamination stack brake under the punching die, which is used to apply the reaction force required to join the plates into the lamination stack. During each working stroke of the press, the laminated stack located in the punch and the laminated stack stopper moves downward by the thickness of the sheet metal. The laminated stack separation is achieved in that the device for producing the laminated stack connection is interrupted once, so that two adjacent sheets cannot be connected at one time. There may be several laminated stacks in the laminated stack stopper. After the laminated stack has been transported through the laminated stack stopper, the laminated stack at the lower end of the laminated stack stopper is usually transferred to a conveyor system, which conveys the finished laminated stack out of the press.

[0004] During the blanking process, there are several methods for connecting the sheets into a stack, namely, press stacking, post stacking and adhesive stacking.

[0005] Punching and stacking establishes point-like connections between adjacent plates. During punching and stacking, embossed knots are introduced into each plate. The embossed knots of adjacent plates are pressed into each other in the die. The friction of the embossed knots pressed into each other produces a holding force between adjacent plates, and a stack of laminations can be gradually formed thereby. The stack of laminations is separated by punching notches, the size of which is designed and the notch is positioned so that the embossed knots cannot be introduced at least once at these positions. As a result, two adjacent plates cannot be connected at least once in the die. Punching and stacking is a process used worldwide for manufacturing stacks of laminations. However, the embossed knots introduced here lead to electrical contact between adjacent plates, which leads to so-called iron losses and thus reduces the efficiency of the motor.

[0006] Post-stacking is a special form of producing a laminated stack from sheets and is characterized in that the insulating layer of the sheets of the coil has additional adhesive properties. The adhesive properties are selected so that they can only be activated under the influence of temperature and / or with the aid of an activator. The adhesive properties of the insulating layer are used to connect the sheets to each other over the entire surface. This process is described in document EP 2 450 189 A1, wherein the process can be integrated into the punching process. The devices required to integrate the post-stacking process into the punching process are complex and therefore costly and require high maintenance.

[0007] The adhesive stacking provided by the aforementioned document EP 1 833 145 B1 eliminates the disadvantages of the efficiency of the punching stacking and the high consumption of the energy of the back stacking. Here, the drip-shaped adhesive point is applied on the insulating layer of the plate strip. Adjacent plates are pressed against each other in the punching die of the punching tool. The adhesive points are distributed on the surface of adjacent plates. When the stack brake is provided by the stack brake below the shifting die, the adhesive medium and the plates are cross-linked to the following extent during this time, so that the stack at least produces the hand-holding strength when leaving the stack brake. The mode of this type of adhesive stacking forms a planar connection between the plates in the area of ​​the application point, and the magnetic properties of the plate strip and the magnetic properties of the final product will not be negatively affected. In this adhesive stacking process integrated into the punching process, the adhesive point is applied on the band surface on the upper side and / or the lower side by means of a piezoelectric micrometering system. The application unit is composed of at least one contactless application head and has at least one actuator connected to a controlled valve, and the actuator is equipped with a piezoelectric crystal. The actively moving components in the application unit also enable the adhesive to be applied on the bottom side. The lamination stack is separated when the system control sends an interrupt signal to the piezoelectric micrometering system to interrupt the application of the adhesive points. In order to protect the adhesive points applied to the sheet metal strip, recesses are provided on the tool, the mold and the guide. Therefore, the devices required for integrating the adhesive lamination process into the punching process are also complex, require high maintenance and are therefore also cost-intensive.

[0008] Document DE 203 18 993 U1 shows a glue stacking process, in which the cutting punch preferably has a flat end face, but this end face can also be interrupted and thus contain recesses. It can be seen that the glue point is applied to the sheet metal strip from below. This glue stacking process is based on the fact that the strip material contacts the surface of the metering device, thereby moving the ball and thus releasing the adhesive flow.

[0009] Document EP 3 217 520 A1 and the similar document KR 101566486 B1 show a bonding stacking process in which the application unit of the adhesive medium is integrated in the lower part of the punching tool. The adhesive medium is provided at the outlet nozzle under pressure and at a preset flow rate so as to be applied to the surface of the bottom side of the sheet metal strip. An activator for the adhesive medium can be applied together with a strip lubricant. Untransferred adhesive droplet residues can be discharged in a channel through the lower part of the mold.

[0010] Document JP 2001321850 A proposes a bonding stacking process in which a drop of bonding liquid is applied to the sheet strip in the punching tool. Before the drop of bonding liquid is applied to the sheet strip, the sheet strip is cleaned. The curing of the adhesive medium can be assisted by heat input in the lamination stack brake.

[0011] In the bonding stacking process provided in document DE 35 35 573 A1, the control of lamination stack separation is realized based on the measurement of the thickness of the plate strip input, in which the single plate is connected to the lamination stack by an adhesive medium in the punching process, and the adhesive medium is applied by a metering device. The adhesive is input from the metering device to the punch through a hose, and is conveyed through the punch with or without a hose. A heating device can be provided in the channel below the blanking part outlet device and the lamination stack brake to assist the adhesive curing. If a two-component adhesive is used, metering is directly achieved by the hose channel and the cutting punch part of the pressing plate. Here, an activator is applied to the bottom side of the blanking part in a phase-shifted manner at the preset adhesive point by a commercially customary metering needle. When using a single-component adhesive, the adhesive is applied to the bottom side of the blanking part by a metering needle device by a metering needle.

[0012] All commercially known adhesive lamination processes for producing laminated cores from sheet metal sheets use complex dispensing and metering systems or application systems for the adhesive medium and / or are susceptible to contamination in the area of ​​the application head.

[0013] The object of the present invention is to provide a method or a device of the aforementioned type which provides a method for applying adhesive dots to the surface of sheet metal strips or sheets which is as simple as possible and requires little maintenance and is therefore cost-effective.

[0014] This object is achieved according to the invention by a method for producing a laminated core having the features of claim 1 and a device having the features of claim 14 .

[0015] The method provides for transferring the adhesive medium in the form of at least one adhesive spot onto the surface of the sheet insulation of the sheet strip or onto the surface of a sheet cut from the sheet strip without a movable component in the application head, wherein the application head is moved perpendicularly to the surface of the sheet strip in order to transfer the adhesive medium in the form of at least one adhesive spot.

[0016] In the device, it is provided that the dispenser is produced by an additive process, in particular a 3D printing process.

[0017] By these measures, the bonding process can be advantageously integrated into the manufacturing process of the lamination stack, wherein the bonding process is carried out during the punching process or after the punching process. The inventor's in-depth research shows that by these measures, the adhesive input can be accurately controlled or regulated according to regulations to apply the adhesive point without the need for a complex design of the input unit or the need for a movable component in the application head. At least to a large extent, the contamination of the metering system, especially the application head, is avoided. By moving the application head vertically relative to the direction of gravity, that is, without using the movable components and operating devices in the application head as in the prior art, the adhesive medium is applied to the upper side of the surface of the sheet insulation part, the adhesive medium is separated by the amount that can be accurately preset under the action of gravity and by the adaptable kinetic energy, wherein, if necessary, the influence of the cohesive force acting here can also be taken into account. By combining the physical force utilized in this way with the simple structure of the application unit, an application system that works accurately, reliably and economically is provided for the adhesive medium when stacking the lamination stack. It should be noted that the expression "point" in this example should not be understood as a mathematical concept in a strict sense, but rather as having a geometric extension dimension due to its volume in accordance with the current actual situation.

[0018] By constructing the distributor with high precision, arbitrary channel guidance, arbitrary channel cross-section and connection geometry for the application head by means of additive processes, in particular 3D printing processes (in which no movable parts are arranged), the device for producing the laminated core can be simply and optimally adapted to the application of the adhesive medium, which is applied according to the above-mentioned parameters.

[0019] Advantageous embodiments of the invention are specified in the dependent claims.

[0020] When the application of the adhesive is integrated into the punching process, it is advantageously provided that the application head is moved synchronously with the working stroke of the punching press.

[0021] In particular, when the adhesive is applied after the punching process, an advantageous embodiment provides that the application head is moved asynchronously with the working stroke of the punching machine.

[0022] The volume of adhesive medium required at the application head is advantageously provided by the pressure level and the pulse duration, depending on the viscosity of the adhesive medium and the kinetic energy of the application head (also adapted to the design of the application head).

[0023] In another advantageous design of the method, in order to accurately transfer the adhesive medium to the sheet insulation part or the plate piece, it is provided that the adhesive medium is transferred as adhesive points to the sheet insulation part of the plate strip or the plate piece by means of the kinetic energy of the application unit and the dispenser of the application head and the gravity of the adhesive medium, with or without utilizing the adhesive force of the adhesive points on the plate strip.

[0024] The application head does not contact the surface of the sheet insulation of the sheet strip or sheet when dispensing the adhesive, wherein the distance between the application head and the sheet strip or sheet is at most 5 mm, preferably at most 1 mm, which contributes to the precise functioning of the method and its integration into the production process of the laminated stack.

[0025] In order to precisely adapt the application of the adhesive to produce the best possible adhesive surface or adhesive connection between the sheets, it is also advantageously provided that the surface of the sheet metal insulation of the sheets is only partially wetted when the adhesive point is applied.

[0026] A further advantageous measure for forming the adhesive surface is to monitor the application of the adhesive point on the sheet insulation of the sheet metal strip or sheet metal strip by means of sensors whether there is local wetting and the extent of the local wetting.

[0027] Furthermore, adjustment of the volume of the individual adhesive points also contributes to an exact adaptation of the adhesive surface on the panel.

[0028] The high quality of the adhesive surfaces and adhesive connections produced during the production process can also be ensured by the volume of the individual adhesive points being adjusted individually by means of a control circuit.

[0029] Furthermore, a uniform application of the adhesive is also assisted by applying a plurality of glue spots to the surface of the sheet strip or sheet by at least one dispenser having at least one input for the adhesive medium and by at least one application head connected to the at least one dispenser, in order to optimize the bonding surface. One or more application heads can be arranged on the dispenser, wherein, for example, each application head can apply only one glue spot per movement. In an alternative design, a plurality of glue spots can also be applied by the application head.

[0030] The application unit for applying the adhesive dots is located in the punching process, so that the application of the adhesive is integrated during the punching process.

[0031] The application of the adhesive is also advantageous if the application unit for applying the adhesive is located outside the punching process, in particular is arranged after the punching process.

[0032] A further advantageous embodiment of the method provides that the distributor and the application head for applying the adhesive are located in the punch of the punching tool.

[0033] The device is advantageously designed such that at least one dispenser for the adhesive medium is made of a metallic material or at least one dispenser for the adhesive medium is made of a non-metallic material, in particular a plastic, preferably a thermosetting plastic.

[0034] A particularly advantageous design of the device in terms of structure and function is that the application head contains no movable components, in particular no driven parts. This design, combined with the additive process for producing the dispenser, results in a configuration of the application system that is well adapted to the required functions and operates as smoothly as possible.

[0035] Furthermore, in order to achieve precise functionality and to reliably monitor the uniformly high quality of the adhesive application, it is advantageous if a sensor, in particular an optical sensor, is present, which can monitor whether the sheet metal strip or sheet metal is locally wetted by the adhesive point and the extent of the local wetting, wherein the monitoring is carried out by the sensor during the application of the adhesive medium or begins after the application of the adhesive medium. The term "sensor" is to be understood in a broad sense, wherein the optical sensor can also be, for example, a camera system for image processing for a setpoint-actual comparison.

[0036] A further advantageous configuration with regard to the function and construction of the device is that the volume of the glue spots is adjustable, in particular independently adjustable by a control circuit having sensors for monitoring the local wetting of the sheet metal strip or blade by the glue spots.

[0037] The distance between the application heads is in particular at most 5 mm, preferably at most 3 mm, which also contributes to high-quality application and distribution of the adhesive medium. Depending on the product, larger distances are also conceivable.

[0038] By producing a laminated core according to the method of one of claims 1 to 13 , a laminated core can be obtained which meets high requirements in terms of structure and function.

[0039] The present invention will be described in more detail below with reference to the accompanying drawings based on the embodiments. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of a device for producing a laminated core from a sheet metal strip unwound from a coil by means of a punching machine and a device for stacking sheets into a laminated core,

[0041] Figure 2 A laminated core consisting of a plurality of plates is shown in a three-dimensional view.

[0042] Figure 3 The sectional view shows a section of a sheet metal strip which consists of a magnetic core material and insulating layers arranged on both sides and to which adhesive spots are applied.

[0043] Figure 4 A simplified illustration of an embodiment of a punching tool arranged in a punching process in which a sheet metal strip is processed stepwise into sheets and a laminated core is shown in a side view, the punching tool consisting of a region for producing the inner contour of the sheet metal, a punch, a die and a laminated core stopper,

[0044] Figure 5 A schematic diagram of an application unit integrated according to the invention in a punching process is shown, comprising a frame, a dispenser with an inlet for an adhesive medium, a plurality of application heads and sensors for monitoring the application of adhesive dots on a sheet metal strip,

[0045] Figure 6 An application unit according to the invention arranged after the punching process is shown, comprising a frame, a dispenser with an inlet for an adhesive medium and a plurality of application heads for applying adhesive dots to the sheet metal,

[0046] Figure 7 An integrated dispenser designed according to the invention is shown, which has an input for an adhesive medium and a plurality of application heads for applying adhesive dots to the sheet in the die of a punching tool, and

[0047] Figure 8 An exemplary embodiment of a dispenser produced by a 3D printing process is shown in a three-dimensional perspective view.

[0048] Figure 1A device for mass production of a laminated core 2 from metal sheets 1 in a punching process 3 is schematically shown. Figure 2 A laminated core 2 composed of a plurality of laminations 1 is shown by way of example.

[0049] To produce the laminated core 2, the sheet metal strip 5 is unwound from the coil 4 by means of a reel 6, optionally fed into a straightening unit 7, and fed stepwise into the working space of a punch 9 and a punching tool 10 by means of a feed system 8. Figure 3 The metal strip 5 shown in detail consists of a (magnetic) core material 20 and an insulating layer 21 arranged on both sides of the core material.

[0050] In the punching tool 10, a plurality of positioning holes are first punched out on the sheet strip 5, which ensure the precise pitch when the sheet strip 5 is fed step by step in the punching tool 10. Then, in the punching tool 10, the inner contour of the sheet 1 is punched out step by step into the sheet strip 5 in the area 40 for producing the inner contour. After all the inner contours of the sheet 1 to be pre-punched have been punched out into the sheet strip 5, the sheet 1 is punched out of the sheet strip 5 by the punch 43 and transferred to the punching die 41 with the laminated stack brake 42 located below (see Figure 4 ).

[0051] Figure 5 An embodiment of the invention is shown, in which an application unit 35 for an adhesive medium for connecting mutually stacked sheets 1 is located in the working space of a punching machine 9 between a feed system 8 and a punching tool 10. The sheet metal strip 5, whose strip width and strip thickness are adapted to the outer dimensions of the sheet metal 1, is fed stepwise into the punching tool 10 by the feed system 8, wherein the step length is adapted to the outer diameter of the sheet metal 1. The sheet metal strip 5 also passes stepwise through the application unit 35 here. The application unit 35 is positioned in the working space of the punching machine 9 so that the adhesive dots 22 can be applied to the insulating layer 21 of the sheet metal strip 5 in the correct position (see Figure 3 ).

[0052] The application unit 35 consists of a frame 30 in which a dispenser 31 is fixed. Application heads 32 are fixed to the dispenser 31 and their number and position are selected and arranged so that the adhesive dots 22 can be applied to the strip with accurate position as long as the strip is not moved by the feed system.

[0053] In order to apply the adhesive dots 22 to the sheet strip 5, the adhesive medium is pulsed into the distributor and the application head 32 fixed to the distributor from a separate adhesive container (not shown here, usually located in the pneumatic and fluid part of the control cabinet) at a distance from the application unit 35 by means of a metering pump or a compressed air valve (generating pressure in the adhesive container) through the input part for the adhesive medium 34. The pulse frequency for inputting the adhesive medium is synchronized with the working frequency of the punching machine 9. The pulse duration and pressure are adjusted so that the adhesive dots 22 on the sheet strip 5 reach a specified size. The distributor 31 has a channel system, which evenly distributes the adhesive medium to the application head 32. The distributor 31 is fixed to the plate of the frame 30 together with the application head 32, and the plate of the frame 30 can be moved downward and upward in the vertical direction (relative to the direction of gravity or in geodesy). The vertical movement can be performed synchronously or asynchronously with the working stroke of the punching machine 9.

[0054] If there is adhesive medium available at the lower end of the application head 32, the distributor 31 and the application head 32 in the frame 30 are moved vertically in the direction of the plate strip 5 to the extent that the application head 32 does not contact the plate strip 5. The distance between the application head 32 and the plate strip 5 is at most 5 mm, preferably at most 1 mm. With the help of the kinetic energy of the distributor 31 and the application head 32, the gravity of the adhesive medium at the lower end of the application head 32, and the adhesive force of the adhesive medium at the plate strip 5 when necessary, the adhesive medium is transferred to the upper side of the plate strip 5 in the form of adhesive points 22. After the adhesive points 22 are transferred to the plate strip 5, the distributor 31 together with the application head 32 are moved vertically upward again in the frame 30, and after the punching operation in the punching tool 10 is completed, the plate strip 5 is moved by the feed system 8 in one step.

[0055] The application of glue dots is repeated until the number of plates 1 with glue dots 22 required for producing the stack 2 is reached. The application of glue dots 22 to the plate strip 5 is then interrupted once to separate the stack by interrupting the pulse for feeding the adhesive medium 34 into the distributor 31 and the application head 32. The separation of the stack can be assisted in that the vertical movement of the distributor 31 and the application head 32 is also stopped at the same time as the pulse for supplying the adhesive medium is interrupted.

[0056] The successful application of the glue spot 22, in particular the presence of the glue spot 22 on the plate strip 5, and the size or volume of the glue spot are monitored by one or more sensors 33 arranged after the application unit 35. In a special embodiment, the size of the glue spot 22 is regulated by the sensor 33 for monitoring the size of the glue spot 22 by means of the pulse duration and pressure for providing the adhesive medium.

[0057] like Figure 4As shown, after the adhesive dots 22 are applied to the sheet strip 5, the sheet strip 5 is gradually conveyed through the punching tool 10, and the inner contour of the sheet 1 is punched out in the area 40 for producing the inner contour in the sheet strip 5. A punch 43 is located in the punching unit of the punching tool 10, which punches out a sheet 1 from the sheet strip 5 in each working stroke of the punching machine 9 and transfers it to the punching die 41. When the punched sheet 1 contacts the sheet 1 located below, the adhesive dots 22 are pressed between two adjacent sheets 1, and thus the adhesive dots are distributed in a planar manner on the surface of the two adjacent sheets 1.

[0058] In each working stroke of the punch 9, the punch 43 presses another sheet 1 into the die 41, and the stack of sheets 1 located below moves downward by the thickness of the sheet. In order to provide time for the adhesive points 22 distributed in a planar manner between the sheets 1 to cure to form the laminated stack 2, a laminated stack brake 42 is located below the punch 41, which generates an axial holding force in the form of friction force on the laminated stack 2 in the punch 41 and in the laminated stack brake 42 through a radial preload. When the finished laminated stack 2 reaches the lower end of the laminated stack brake 42, the laminated stack is transferred there by gravity or by means of a lifting system to the conveying system 11, which conveys the finished laminated stack 2 out of the punch 9.

[0059] exist Figure 6 In another embodiment of the invention shown, an application unit 35 is arranged after the punching process 3. This design allows the sheet 1 to be subjected to further processing steps, such as heat treatment, between the punching process 3 and the application of the adhesive dots 22 on the insulating layer 21 of the sheet, which further processing steps could weaken or destroy the previously formed adhesive connection between the sheet 1 and the laminated core 2.

[0060] The application unit 35 also has a frame 30 in which a dispenser 31 is fixed. Application heads 32 are fixed to the dispenser 31 with an input for the adhesive medium 34, the number and position of which are selected and arranged so that the adhesive dots 22 can be applied to the plate 1 with precise position.

[0061] First, manually or automatically place the plate 1 into the application unit 35 with precise position. In order to apply the adhesive point 22 to the plate 1, the adhesive medium is input in a pulsed manner through the input part 34 for the adhesive medium in the distributor 31 and the application head 32 fixed at the distributor. The pulse duration and pressure are adjusted so that the adhesive point 22 on the plate 1 reaches a predetermined preset size or preset volume. The distributor 31 has a channel system, which evenly distributes the adhesive medium to the application head 32. The distributor 31 is fixed on the plate of the frame 30 together with the application head 32, and the plate of the frame 30 can move downward and upward in the vertical direction. The vertical movement can be driven manually or automatically here. If there is an adhesive medium available at the lower end of the application head 32, the distributor 31 and the application head 32 in the frame 30 are manually or automatically driven to move vertically in the direction of the plate 1 to the following extent, that is, the application head 32 does not contact the plate 1. The distance between the application head 32 and the plate 1 is here a maximum of 5 mm, preferably a maximum of 1 mm. The adhesive medium is transferred to the upper side of the plate 1 in the form of adhesive spots 22 with the aid of the kinetic energy of the distributor 31 and the application head 32, the weight of the adhesive medium at the lower end of the application head 32 and, if necessary, the adhesive force of the adhesive medium at the plate 1. After the adhesive spots 22 have been transferred to the plate, the distributor 31 with the application head 32 is moved vertically upwards in the frame again into its initial position.

[0062] The plates 1 are then removed manually or automatically from the application unit 35 and fed into a stacking unit, where the plates 1 are stacked one on top of the other with precise position and pressed. By pressing adjacent plates 1 against one another, the adhesive points 22 are distributed in a planar manner between the plates. The adhesive points or adhesive surfaces cure by applying pressure and time, and the adjacent plates 1 are connected to form a laminated stack 2. The finished laminated stack 2 is removed manually or automatically from the stacking unit.

[0063] exist Figure 7 In the third exemplary embodiment of the invention shown, the distributor 31 and the application head 32 are integrated in the punch 43 in the punching tool 10. This embodiment advantageously results in a particularly short distribution path for the adhesive.

[0064] In order to apply the adhesive point 22 to the sheet strip 5, according to this embodiment, the adhesive medium is pulsed into the distributor 31 and the application head 32 fixed at the distributor through the input part 34 for the adhesive medium. The pulse frequency is synchronized with the working frequency of the punch 9. The pulse duration and pressure are adjusted so that the adhesive point 22 on the sheet strip 5 reaches a specified size. The distributor 31 has a channel system, which evenly distributes the adhesive medium to the application head 32. The adhesive medium is provided at the lower end of the application head 32 at the earliest when the punch 43 moves upward during the upward movement of the press punch and the distance from the surface of the previously punched sheet 1 reaches at least 1 mm. At the latest, when the punch 43 is moved downward by the press punch and the distance between the punch 43 and the sheet strip 5 is still at least 1 mm, the adhesive medium is provided at the lower end of the application head 32. When the punch 43 contacts the sheet strip 5 during the downward movement and begins to punch out the sheet 1 from the sheet strip 5, the adhesive medium is transferred from the application head 32 to the sheet strip in the form of adhesive spots 22. When the adhesive medium is applied to the sheet strip 5, the application head 32 does not contact the sheet strip 5, wherein the distance between the application head 32 and the sheet strip 5 is at most 5 mm, preferably at most 1 mm. The adhesive medium is transferred to the upper side of the sheet strip 5 in the form of adhesive spots 22 by the kinetic energy of the distributor 31 and the application head 32 in the punch 43, the gravity of the adhesive medium at the lower end of the application head 32, and the adhesive force of the adhesive medium at the sheet strip 5 if necessary. When the adhesive spots 22 are transferred to the sheet strip 5, the process of punching out the sheet 1 from the sheet strip ends, and the punch 43 safely leaves the sheet strip 5 during its upward movement, and the sheet strip 5 is moved by the feed system 8 in one step.

[0065] The application of the glue dots is repeated until the number of sheets 1 with the glue dots 22 required for producing the laminated stack 2 is reached. The application of the glue dots 22 to the sheet strip 5 is then interrupted once to separate the laminated stack by interrupting once the pulse for feeding the adhesive medium 34 into the dispenser 31 and the application head 32. In the case of automatic drive, the dispenser 31 and the application head 32 in the punch 43 are raised by at least 0.5 mm while interrupting the pulse for providing the adhesive medium, thereby assisting the separation of the laminated stack.

[0066] In each working stroke of the punching machine 9, a sheet is punched out of the sheet strip 5 and transferred to the punching die. When the punched sheet 1 contacts the sheet 1 located below, the glue points 22 are pressed between two adjacent sheets 1 and thus distributed in a planar manner on the surface of the two adjacent sheets 1.

[0067] In each working stroke of the punch 9, the punch 43 presses another sheet 1 into the die 41, and the stack of sheets 1 located below moves downward by the value of the sheet thickness. In order to solidify the joints between the sheets 1 and create time for forming the laminated stack 2, the laminated stack brake 42 is located below the punching die 41, and an axial clamping force in the form of friction is generated on the laminated stack 2 in the die 41 and the laminated stack brake 42 through radial preload. When the finished laminated stack 2 reaches the lower end of the laminated stack brake 42, the laminated stack is transferred to the conveying system 11 by gravity or by means of a lifting system, and the conveying system conveys the finished laminated stack 2 out of the punch 9.

[0068] Figure 8 The distributor 31 manufactured by the 3D printing process is shown as an example, and the distributor has a distributor channel 50 located inside, which imports the adhesive medium from the input 34 of the adhesive medium into the distributor 31 through an interface 51 or a connection position. The adhesive medium is guided to three other current interfaces 52 in the distributor 31 through the channel system 50, and is transferred to the application head 32 there. Alternatively, the other interfaces can also be more than or less than three. The special shape of the distributor channel 50 is advantageously manufactured by thermosetting plastics through the 3D printing process.

Claims

1. A method for producing a laminate stack (2) from a plurality of plates (1), wherein: By means of an application unit (35) through an application head (32), an adhesive medium is applied as at least one adhesive spot (22) to the upper side of the surface of a sheet insulation part (21) of a sheet strip (5) guided horizontally relative to the direction of gravity, characterized in that the adhesive medium is transferred in the form of at least one adhesive spot (22) to the surface of the sheet insulation part (21) of the sheet strip (5) or to the surface of a sheet (1) cut from the sheet strip without a movable component in the application head (32), wherein the application head (32) is moved vertically relative to the surface of the sheet strip (5) in order to transfer the adhesive medium in the form of at least one adhesive spot (22).

2. The method according to claim 1, characterized in that The application head (32) moves synchronously with the working stroke of the punching machine (9).

3. The method according to claim 1, characterized in that The application head (32) moves asynchronously with the working stroke of the punching machine (9).

4. The method according to any one of the preceding claims, characterized in that With or without utilizing the adhesive force of the adhesive points (22) on the plate strip (5), the adhesive medium is transferred as adhesive points (22) to the plate insulating part (21) of the plate strip (5) or the plate sheet (1) by means of the kinetic energy of the application unit (35) and the dispenser (31) of the application head (32) and the gravity of the adhesive medium.

5. The method according to any one of the preceding claims, characterized in that The application head (32) does not contact the surface of the sheet insulation (21) of the sheet strip (5) or sheet (1) when dispensing the adhesive medium, wherein the distance between the application head (32) and the sheet strip (5) or sheet (1) is at most 5 mm, preferably at most 1 mm.

6. The method according to any one of the preceding claims, characterized in that When the adhesive dots ( 22 ) are applied, the surface of the sheet metal insulation ( 21 ) of the sheet metal sheet ( 1 ) is only partially wetted.

7. The method according to any one of the preceding claims, characterized in that The application of the adhesive point (22) on the sheet insulation (21) of the sheet strip (5) or sheet metal sheet (1) is monitored by sensors to determine whether there is local wetting and the extent of the local wetting.

8. The method according to any one of the preceding claims, characterized in that The volume of each adhesive point (22) is adjusted.

9. The method according to any one of the preceding claims, characterized in that The volume of each glue spot (22) is independently adjusted by a control circuit.

10. The method according to any of the preceding claims, characterized in that A plurality of glue spots are applied to the surface of the sheet metal strip (5) or sheet metal (1) by means of at least one dispenser (31) having at least one input (34) for an adhesive medium and by means of at least one application head (32) connected to the at least one dispenser (31).

11. The method according to any one of the preceding claims, characterized in that An application unit (35) for applying the adhesive dots (22) is present during the punching process (3).

12. The method according to any one of claims 1 to 10, characterized in that The application unit (35) for applying the adhesive (22) is located outside the punching process (3), in particular after the punching process.

13. The method according to any one of claims 1 to 11, characterized in that The adhesive is applied by means of a configuration in which the distributor (31) and the application head (32) are located within the punch (43) of the punching tool (10).

14. A device with an application unit (35) for producing a laminated stack (2) from a plurality of sheets (1), the device having an application head (32), at least one dispenser (31) for an adhesive medium and a frame (30) for accommodating one or more dispensers (31) and at least one application head (32), the dispenser having at least one input section (34) for the adhesive medium, characterized in that The dispenser (31) is manufactured by an additive process, in particular a 3D printing process.

15. The device according to claim 14, characterized in that At least one dispenser (31) for an adhesive medium is made of a metallic material.

16. The device according to claim 14, characterized in that At least one dispenser (31) for the adhesive medium is produced from a non-metallic material, in particular a plastic, preferably a thermosetting plastic.

17. The device according to claims 14 to 16, characterized in that The application head (32) contains no movable components, in particular no driven parts.

18. The device according to any one of claims 14 to 17, characterized in that A sensor (33), in particular an optical sensor (33), is present, which is able to monitor whether the plate strip (5) or the plate sheet (1) is locally wetted by the adhesive point (22) and the extent of the local wetting, wherein the monitoring is performed by the sensor (33) when the adhesive medium is applied or the monitoring by the sensor (33) begins after the adhesive medium has been applied.

19. The device according to any one of claims 14 to 18, characterized in that The volume of the glue spots (22) can be adjusted, in particular independently by means of a control circuit having a sensor (33) for monitoring the local wetting of the sheet metal strip (5) or sheet metal (1) by the glue spots (22).

20. The device according to any one of claims 14 to 19, characterized in that The distance between the application heads (32) is at most 5 mm, preferably at most 3 mm.

21. A lamination stack (2) consisting of a plurality of plates (1), characterized in that: The laminated core (2) is produced according to the method according to any one of claims 1 to 13.

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