EP3665713A1

EP3665713A1 - Device and method for producing transformer cores

Info

Publication number: EP3665713A1
Application number: EP18758559.1A
Authority: EP
Inventors: Volker Loth; Jost Friedrich
Original assignee: Heinrich Georg Maschinenfabrik GmbH
Current assignee: Heinrich Georg Maschinenfabrik GmbH
Priority date: 2017-08-10
Filing date: 2018-08-09
Publication date: 2020-06-17
Also published as: KR20200037822A; KR20200036907A; CN110998766A; WO2019030349A1; CN111052277A; US20200251280A1; JP2020530655A; US11495402B2; CN110998765A; CN110998766B; US20210147167A1; EP3665712B1; KR102475509B1; JP2023134696A; KR102628594B1; EP3665712A1; WO2019030350A1; JP2020529737A; US11521795B2; WO2019030352A1

Abstract

The invention relates to a device and to a method for producing transformer cores, the device comprising a cutting device (33) for cutting metal sheets (16), from which a transformer core can be formed, and comprising a reel system (32) having a reel (34, 35), wherein the reel has reel heads (36, 38) each having a strip steel roll (37, 39), wherein at least one strip steel roll is arranged for unwinding in a production direction of the cutting device, wherein a metal-sheet strip (42, 43) of the strip steel roll can be fed to the cutting device, wherein the reel system has at least two reel heads each having a strip steel roll arranged thereon, wherein the strip steel rolls can be unwound in the production direction of the cutting device and are arranged in a row relative to each other, and wherein the device comprises a feeding system (46), by means of which metal-sheet ends of the metal-sheet strips of the strip steel rolls can be fed to the cutting device in an automated manner.

Description

Apparatus and method for manufacturing transformer cores

The invention relates to an apparatus and a method for producing transformer cores, the apparatus comprising a cutting device for cutting sheets from which a transformer core can be formed, and a reel system with a reel, the reel having reel heads each having steel reels - At least one strip steel roll is arranged unwound in a direction of production of the cutting device, wherein a metal strip of the steel strip roll of the cutting device can be supplied.

The known from the prior art systems for the production of transformer cores and are constructed according to a process flow so that first transformer sheets are cut out of sheet metal strips by means of a cutting device. The metal strips are stored on a steel strip reel, which is supported by a reel head of a reel. The reel may have a plurality of reel heads with steel rolls so that different metal strips may be supplied to the cutter as needed. A change of metal strips or a supply of a metal strip to the Cutting device can be done for example manually or via a conveyor belt, but j edoch the change of the metal strip or the steel strip reel is time consuming.

The cut sheets in the cutting device can have very different geometries, since a transformer core is regularly assembled from sheets of different shapes. The sheets can be led away from the cutting device by a conveyor belt and stored or stacked for further processing. A composite of the transformer core from the sheets takes place on a so-called Legetisch. At the Legetisch are threading bolts and / or

Sheet metal stops are fixedly mounted as positioning aids and the sheets are assembled or stacked on the threading pins to the transformer core. The sheets in particular have holes or cutouts into which the thread bolts can engage. The sheets are attached to the threading bolts or stacked along sheet metal bumps and positioned relative to each other in the correct position. The formation of a stack of sheets on the laying table can in principle be done manually, but also automatically. It is essential that there is always a sufficient number of different sheets for the construction of the transformer core available, for example, to avoid downtime.

Since the laying table is always constructed for a transformer core with a position of the positioning aids or threading bolts displaceable in guides, a laying table can always only be used after a conversion for producing a type of transformer core. If a variety of types of transformer cores are to be produced with a plant, a correspondingly large number of leasing tables is required for core molds outside the displacement areas of the positioning aids which have to be kept.

The object of the present invention is therefore an apparatus and a method for producing transformer cores propose that allows a cost-optimized production of transformer cores.

This object is achieved by a device having the features of claim 1 and a method having the features of claim 7. The device according to the invention for producing transformer cores comprises a cutting device for cutting metal sheets from which a transformer core can be formed, and a reel system with a reel, the reel having reel heads with in each case steel strip rolls, wherein at least one steel strip reel in a production direction of the cutting device is arranged unwound, wherein a

The stripper system has at least two reel heads each having a strip steel roller arranged thereon, wherein the strip steel reels are unwound in the production direction of the cutting device and arranged in a row relative to one another, wherein the device comprises a feed system the sheet metal ends of the metal strip of strip steel rollers of the cutting device are automatically fed.

The reel system with the two reel heads is therefore designed so that always at least two steel strip rolls in the production direction of the cutting device are unwound and wound up wound. These steel strip rolls are therefore arranged relative to each other in a row so that the j eweiligen sheet metal strips of the steel strip rolls can be alternately fed to the cutting device. With the feed system, a sheet metal end of one of the metal strips of the cutting device can then be automatically fed or pulled out of this. In this case, an optional supply of sheet metal ends of the steel strip rolls is possible, so that, depending on which transformer sheet is to be produced by the cutting device, which in each case suitable metal strip can be introduced from the feed system in a, for example formed from rolls feed the cutting device. If a change of metal strip for the manufacture of other Transformer sheets is to be made, can then be pulled out of the cutter by means of the respective reel head of the metal strips and automatically introduced into the feed of the cutting device by means of the feed system of sheet metal strips intended for processing. Overall, it is possible without a cumbersome change of reel heads with steel rollers before the cutting device to make a quick change of the processed metal strip. Also, this change is not particularly expensive, since it can be done automatically by means of the feed system. Overall, with the device different transformer cores can be made faster and therefore more cost-effective.

The delivery system may include a multi-axis robot. The robot may then have means for gripping the sheet metal ends so that a sheet end can be picked up by the robot from the strip steel roll and transported to feed the cutting device. These means may for example be a vacuum sucker, a magnet or a pair of pliers, which may optionally be arranged at one end of a robotic arm of a multi-axis robot. A production of transformer plates can thus be made more flexible. The delivery system may alternatively comprise a conveyor with a diverter. The conveyor device can be, for example, a conveyor belt or else a roller belt, via which a metal strip can be transported with a plate end in the direction of a feed of the cutting device. The switch can form or interrupt a transport path to the cutting device, so that optionally, depending on the position of the switch, one of the metal strips of the steel strip rolls can be conveyed to the cutting device and inserted into the feed there. A leading function of the switch is no longer required when the cutting device feeds the sheet metal strip in question over the feed. The switch can already have another position. tion, for example, to prepare for feeding the other metal strip.

On the whole, it is also possible to extract a metal strip from the cutting device by means of a reel head and at the same time to supply another metal strip to the cutting device or unwind from the strip steel reel by means of the feed system. This makes it possible to change sheet metal strips very quickly.

The reel system may comprise at least two reels. In this case, a first winder head can then be arranged on a first winder and a second winder head on a second winder such that the first and the second winder heads are arranged relative to one another in a row in front of the cutting device in the production direction. The reel heads are then positioned one behind the other in the direction of production. The respective reels may in turn have a plurality of reel heads arranged around the reel. The use of two reels allows a quick change of a strip steel roll, for example by simply rotating the reel, while another reel of the other reel is used with the cutting device. Furthermore, the reel system may comprise a reel having at least two reel heads arranged in a row. The reel system can then have exclusively this one reel. In addition, however, it is also possible that the reel system comprises a plurality of reels with two reel heads arranged in a row. Thus, an even larger number of reel heads or strip steel rolls can be arranged in a row in front of the cutting device.

The reel can be designed to be rotatable about a vertical axis and have at least four reel heads arranged offset relative to one another relative to the vertical axis by 90 °. Thus, by a rotation of the reel about the vertical axis a strip steel roll easily in a position in Production direction are brought before the cutting device.

At the same time it is then possible to replace during the use of this steel strip reel on the other reel heads of the reel strip steel rolls, so as to supply new material. In the method according to the invention for producing transformer cores with a device, metal sheets are cut with a cutting device of the apparatus from which a transformer core is formed, wherein band reels are arranged on each reel heads of a reel of a reel system of the apparatus, wherein at least one steel reel in one Production direction of the cutting device is arranged and unwound, wherein a metal strip of strip steel roller of the cutting device is fed to at least two reel heads of the reel system in each case strip steel rolls are arranged, the steel strip rolls are unwound in the direction of production of the cutting device and arranged relative to each other in a row be automatically fed by means of a feed system of the device plate ends of the metal strip of steel strip rollers of the cutting device. With regard to the advantages of the method according to the invention, reference is made to the description of advantages of the device according to the invention.

The device may comprise a control device, by means of which a feeding and / or a withdrawal of the sheet metal ends to or from the cutting device can be controlled in dependence on a shape of the transformer core to be produced. The controller may include data processing means such as a computer and / or a PLC controller. The shape of the transformer core to be produced can result from the desired physical properties and the measures derived therefrom, which can be determined or calculated using a core configurator for transformer cores. The core configurator may in particular be a software. Likewise, dimensions for sheets of the transformer core may be taken from the core derived from the configurator and transmitted to the cutting device. Depending on the transformer core to be produced, the plate or the corresponding metal strip required for the respective transformer plates can be fed by means of the control device of the cutting device. Due to the fact that the feed takes place automatically and the strip steel rolls are already arranged in front of the cutting device, a change of the sheet metal strip can be made particularly quickly. So it is also possible to produce a variety of transformer cores with one and the same device without costly set-up times. From a control system of a plant for the production of transformer cores, depending on a transformer core descriptive component data control commands can be transmitted to the control device. The control system may include, for example, the core configurator. It can further be provided that the control system controls the entire plant for the production of transformer cores. The existing in the control system component data of a transformer core can be converted into control commands, which are transmitted to the control device. The control system may also include data processing means, such as a computer with software. By means of the control system, a positioning of threading bolts on laying tables, a positioning system adjacent storage positions for the j eweiligen sheets and / or a cutting sequence of the cutting device for sheets can be determined. For example, it is then also possible with the control system to match the various workstations of the plant for the production of transformer cores to one another in such a way that an optimal material flow can be realized with short throughput times. The cutting frequency of a sheet metal cutting device can for example be adapted to a set of metal sheets at storage positions on a robot, so that a sufficient amount of metal sheets is always available at the storage positions. Furthermore, the laying tables can be equipped with threading bolts in such a way that Certain types of transformer cores can be produced depending on a material flow. For example, the control system may already determine or calculate the positions of the threading bolts on the positioning surface and transmit control commands to the control device for fitting a laying table with threading bolts at the calculated positions. For example, if strip steel rolls required to produce a transformer core become unavailable, the control system may initiate production of other transformer cores for which sufficient material is present. The control system can then transmit control commands for the conversion of laying tables to the control device and initiate the production and provision of corresponding metal sheets.

The reel may weigh the respective strip steel roll with a weighing device and transmit weight data to the control system, the control system deriving a strip length from the weight data and determining a use of the respective strip steel roll with the cutting device. When the control system calculates the tape length from the weight data, at a tape length limit, feeding of a new tape roll to the reel may be initiated by the control system. Thus, after a final consumption of the strip steel roll, a new strip steel roll is already available at the reel, whereby downtimes are avoided. Further, by knowing the tape length, it is possible to use the band steel reels on the reel in accordance with the respective tape lengths. For example, the control system may calculate a number of transformer laminations that may be manufactured with a strip steel roll.

The sheet metal ends can be threaded or positioned and / or removed by means of a multi-axis robot of the feed system on the cutting device. The robot can place one end of a sheet directly on one Grasp the strip steel roll and feed it to the cutting device.

Furthermore, provision can also be made for the robot, after removal of the sheet metal end, to return it to the respective strip steel roll during winding of the strip steel roll. On a conveyor belt for the sheet metal end can be completely dispensed with.

The robot can separate a sheet end from the strip steel roll, adhere to the strip steel roll and / or attach an identifier to the strip steel roll. When the sheet end is fixed to a strip steel roll to prevent winding of the strip steel roll, the robot may remove the attachment or lift the sheet end from the strip steel roll and then feed the cutting device. When the sheet end is returned to the strip steel roll, the robot can glue the sheet end to the strip steel roll by means of a suitable device or fasten it in another way. Furthermore, it can be provided that the robot attaches an identifier, such as a code, barcode or transponder, to the steel strip reel. The identification on the strip steel roll may also include other information about the strip steel roll, such as a remaining strip length. This information can be further processed by means of a control system of a plant.

In the context of an alternative method sequence, the sheet metal ends can be threaded or positioned on the cutting device by means of a switch of a conveyor belt of a conveyor device of the feed system. Advantageously, while a sheet end is fed by means of the cutting device by unwinding the j eweiligen strip steel roll while the cutting device, a further sheet end are fed by winding the j eweiligen strip steel roll. The supply can then be done via the appropriately positioned switch. At the same time, with one of the reel heads, the further sheet metal end that is still in the cutting device can be pulled out of the cutting device and wound up on the associated steel strip reel. Because these advantages can be performed simultaneously, so a particularly fast change of metal strips is possible.

It can also be provided that the band steel rollers in each case have a transponder, with a transceiver unit of the reel system being able to recognize the band steel rollers on the basis of the transponder. Thus, an automated control can be carried out to the effect that it is always ensured that the j eweiligen strip steel rolls are arranged on the designated reel heads.

Further advantageous embodiments of the method will become apparent from the feature descriptions of the dependent claims back to claim 1.

Hereinafter, various embodiments of the invention will be explained in more detail with reference to the accompanying drawings.

Show it:

Fig. 1 is a schematic representation of a plant for the production of transformer cores;

Fig. 2 is a plan view of a first embodiment of a reel system;

FIG. 3 shows a side view of the reel system from FIG. 2 in a first working position; FIG.

FIG. 4 shows a side view of the reel system from FIG. 2 in a second working position; FIG.

Fig. 5 is a plan view of a second embodiment of a reel system;

6 is a side view of the reel system of FIG. 5th 1 shows a schematic representation of a system 10 with a device 1 1 for the production of transformer cores 12. The system 10 includes a control system 1 3 which serves to control the system 10. With the control system 13, the transformer cores 12 are written component data 14 by means of a so-called core configurator

Processed so that sheets 16 from which the transformer core 12 is formed, are calculated with their dimensions. The control system 13 transmits control commands or data for producing the transformer core 12 to a control device 17, which then initiates the production of the transformer core 12 with corresponding control commands.

The device 11 comprises, inter alia, a number of laying tables 118 having a holding system 19 for accommodating metal sheets 16. The holding system 19 has at least two threaded bolts 20 and, in the embodiment illustrated here, substructures 21 for supporting the metal sheets 16. The plates 1 6 are formed with holes not shown here and are placed or attached to the threaded bolts 20. The placement of the metal sheets 16 on the threading bolts 20 and the laying table 18 takes place by means of a robot 22 of a robot system 23. The positioning of the threading bolts 20 also takes place by means of a robot 24 of a positioning system 25 on a positioning surface 26 of the laying table 1 Positioning surface 26 is flat, so that a free positioning and location-independent attachment of the threading bolts 20 on the positioning surface 26 can be carried out according to the specifications of the control system 13. The threading bolts 20 are stored in a magazine 27 and are arranged with the robot 24 on the positioning surface 26 or removed therefrom. The Legetisch 1 8 is transported by means of a self-propelled carriage 28. The carriage 28 transports the laying table 118 to the robot systems 23 shown here, on which a loading of the laying table 18 with metal sheets 16 or stacking of the sheets is carried out

16 takes place to the transformer core 12. After the ready stacking of the Transformer core 12, the laying table 1 8 is transported away with the carriage 28 of the robot system 23 again.

The robot systems 23 are fed by means of a conveying device 29 a number of sheets 16 from a cutting device 30, and adjacent the j eweiligen robot 22 at two storage positions 3 1 for each eweils different sheets 1 6 stacked. A control of the robot 22 or the storage position 3 1 takes place here also by means of the control device 1 7. The robot 22 takes from the j eweiligen storage positions 3 1, the sheets 16 and positioned on the Fädelbolzen 20 on the laying table 1 8, to the transformer core 12 is formed. The robot 22 is movable above the conveyor device 29, so that the robot 22 can simultaneously equip four Legetische 1 8 with sheets 16.

The cutting device 30 shown here only schematically serves to cut the sheets 1 6 and is controlled by the control device 17. In the cutting device 30, not shown here sheet metal strips are cut so that the sheets 1 6 are formed. The cutting device 30 are supplied to sheet metal strips, not shown here, of steel strip rolls. A synopsis of FIGS. 2 to 4 shows a reel system 32 on a cutting device 33. The reel system 32 comprises a first reel

34 and a second reel 35, wherein the first reel 34 has reel heads 36 with steel reels 37 and the second reel 35 has reel heads 38 with steel reels 39. The reels 34 and 35 are in each case rotatable about a vertical axis 40 or 41 and the respective reel heads 36 and 38 are offset relative to one another by 90 ° at the reels

35 and 36 arranged. In each case here indicated metal strips 42 and 43 of the reels 34 and 35 can be supplied to an introduction 44 of a not visible here feed the cutting device 33 in a direction indicated here by an arrow 45 production direction. The arranged in the direction of production strip steel rollers 37 and 39 are particularly positioned relative to one another in a row prior to insertion 44. Below these strip steel rollers 37 and 39 is a feed system 46, which is formed here from a conveyor device 47 with a switch 48. The conveying device 47 has a conveyor belt 49 with a belt centering 55, via which the metal strips 42 and 43 can be conveyed in the direction of the introduction 44.

A first working position of the switch 48 can be seen in FIG. 3, in which case the metal strip 43 can be guided directly into the introduction 44 via the switch 48. A similar supply can in principle also be done with the metal strip 42 by means of the switch 48.

According to Fig. 4, the switch 48, which is also formed in the manner of a conveyor belt 5 1, positioned in a first working position so that the metal strip 43 passes through a horizontal slot 52 loop-shaped to eliminate bending stresses in the metal strip 43.

The reel system 53 shown in FIGS. 5 and 6 is likewise arranged in front of a cutting device 54 and formed on its own from a reel 55. The reel 55 has a total of eight reel heads 56 with in each case different steel reels 57. At least two reel heads 56 are always arranged in a direction indicated here by an arrow 58 production direction of the cutting device 54 relative to each other in a row. Again, the reel 55 and the reel heads 56 is rotatable about a vertical axis 59. A feed system 60 is formed by a multi-axis robot 61. The robot 61 has a robot arm 62, at the end 63 of which a gripping device 64 is used for handling band ends (not shown here) of metal strips 65 and 66 of the band steel rollers 57. The robot 6 1 can grasp the respective band ends on the metal strips 65 or 66 and lead to an insertion 67 of the cutting device 54. Next can also be with the robot 61 Sheet metal end of a metal strip 65 and 66 are returned to a strip steel roller 57 when it is pulled out of the cutting device 54.

Claims

claims

Device (11) for producing transformer cores (12), the device comprising a cutting device (30, 33, 54) for

Cutting of sheets (16) from which a transformer core can be formed, and a reel system (32, 53) with a reel (34, 35, 55), wherein the reel reel heads (36, 38, 56) each with steel rollers (37 , 39, 57), wherein at least one strip steel roll is unwound in a production direction of the cutting device, wherein a sheet metal strip (42, 43, 65, 66) of the strip steel roll of the cutting device can be fed,

characterized ,

in that the reel system has at least two reel heads each with a steel strip roll arranged thereon, the strip steel reels being developable in the production direction of the cutting device and arranged in a row relative to one another, the device comprising a feed system (46, 60) with the sheet ends of the metal strips of the steel reels the cutting device can be fed automatically.

2. Apparatus according to claim 1,

characterized ,

the feed system (60) comprises a multi-axis robot (61).

Device according to claim 1,

characterized ,

in that the feed system (46) has a conveying device (47) with

Soft (48) includes.

4. Device according to one of the preceding claims,

characterized ,

the reel system (32) comprises at least two reels (34, 35).

Device according to one of the preceding claims,

characterized ,

the reel system (53) comprises a reel (55) with at least two reel heads (36, 38, 56) arranged in a row.

Device according to one of the preceding claims,

characterized ,

the reel (34, 35, 55) is designed to be rotatable about a vertical axis (40, 41, 59) and has at least four reel heads (36, 38, 56) arranged offset relative to one another by 90 ° relative to the vertical axis.

Method for producing transformer cores (12) with a device (11), wherein sheets (16) are cut by means of a cutting device (30, 33, 54) of the device, of which a

Transformer core is formed, wherein at each reel heads (36, 38, 56) of a reel (34, 35, 55) of a reel system (32, 53) the band-press rolls (37, 39, 57) are arranged, wherein at least one strip steel roll is arranged and unwound in a production direction of the cutting device, wherein a sheet-metal strip (42, 43, 65, 66) is fed to the strip-steel roll of the cutting device,

characterized ,

strip steel rolls are arranged on at least two reel heads of the reel system, wherein the steel reels are unwound in the production direction of the cutting device and are arranged in a row relative to one another, whereby the sheet metal strip of the steel reels of the cutting device is automated by means of a feed system (46, 60) be supplied.

Method according to claim 7,

characterized ,

in that the device comprises a control device (17) by means of which feeding and / or extraction of the sheet metal ends to and from the cutting device (30, 33, 54) is controlled in dependence on a shape of the transformer core (12) to be produced. 9. The method according to claim 8,

characterized ,

control commands are transmitted to the control device (17) by a control system (23) of a system (10) for producing transformer cores (12) as a function of component data describing a transformer core.

10. The method according to claim 9,

characterized ,

in that by means of the control system (23) a positioning of threading bolts (20) and / or sheet metal stops on laying tables (18), one Positioning system (25) adjacent storage positions (31) for the respective sheets (16) and / or a cutting sequence of the cutting device (30, 33, 54) is determined for sheets.

11. The method according to claim 9 or 10,

characterized ,

that the reel (34, 35, 55) weighs the respective strip steel rolls (37, 39, 57) with a weighing device and transmits weight data to the control system (23), the control system deriving a strip length from the weight data and a use of the respective ones Strip steel roller with the cutting device (30, 33, 54) determined.

12. The method according to any one of claims 7 to 11,

characterized ,

the sheet metal ends are threaded and / or removed by means of a multi-axis robot (61) of the feed system (60) on the cutting device (30, 54).

13. The method according to claim 12,

characterized ,

that the robot (61) after removal of the sheet metal end of this to the respective strip steel roll (57) during a winding of the

Reverts to strip steel roll.

14. The method according to claim 12 or 13,

characterized ,

in that the robot (61) separates a sheet metal end from the strip steel roll (57), adheres it to the strip steel roll, and / or an identifier on the strip

Install strip steel roll. Method according to one of claims 7 to 11,

characterized ,

in that the sheet-metal ends are threaded onto the cutting device (30, 54) by means of a switch (48) of a conveyor belt (49, 51) of a conveyor device (47) of the feed system (46).

16. The method according to claim 15,

characterized ,

in that, during the cutting device (30, 54), one end of the sheet is fed via the turnout (48) by unwinding the respective strip steel roll (57), another end of the sheet being returned by winding up the respective strip roll.

17. The method according to any one of claims 7 to 16,

characterized ,

that the band steel rollers (37, 39, 57) each have a transponder, wherein a transmitter-receiver unit of the reel system

(32, 53) recognizes the strip steel rolls by means of the transponder.