A plant (10) and a method are described for manufacturing ferromagnetic cores of electric machines formed by a plurality of laminations which are packed and joined together by gluing in a blanking/punching tool (15) to which a continuous metal laminate (11) of ferromagnetic material is fed. In addition to the blanking/punching tool, the plant comprises at least one unit (21) for applying an adhesive material to a surface of the continuous metal laminate, at least one unit (25) for applying an activating compound to the opposite surface of the continuous metal laminate and at least one control unit (22) for controlling the application of the adhesive material and the activating compound into the respective application units. The unit for applying an adhesive material to a surface of the continuous metal laminate comprises a printing device (23, 60) and at least one transfer element (28, 51) on which the printing device deposits the adhesive material according to one or more impressions of a shape corresponding to the outline of each of the laminations. The adhesive material is then applied by the at least one transfer element to a surface of the continuous metal laminate according to the outline of each lamination, which is defined by the impressions.
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
B32B 37/12 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 7/14 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
2.
PLANT AND METHOD FOR MANUFACTURING FERROMAGNETIC CORES OF ELECTRIC MACHINES
A plant (10) and a method are described for manufacturing ferromagnetic cores of electric machines formed by a plurality of laminations which are packed and joined together by gluing in a blanking/punching tool (15) to which a continuous metal laminate (11) of ferromagnetic material is fed. In addition to the blanking/ punching tool, the plant comprises at least one unit (21) for applying an adhesive material to a surface of the continuous metal laminate, at least one unit (25) for applying an activating compound to the opposite surface of the continuous metal laminate and at least one control unit (22) for controlling the application of the adhesive material and the activating compound into the respective application units. The unit for applying an adhesive material to a surface of the continuous metal laminate comprises a printing device (23, 60) and at least one transfer element (28, 51) on which the printing device deposits the adhesive material according to one or more impressions of a shape corresponding to the outline of each of the laminations. The adhesive material is then applied by the at least one transfer element to a surface of the continuous metal laminate according to the outline of each lamination, which is defined by the impressions.
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
B21D 28/02 - Punching blanks or articles with or without obtaining scrapNotching
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
3.
PROCESS FOR PRODUCING FERROMAGNETIC CORES OF ELECTRIC MOTORS AND SO- MANUFACTURED FERROMAGNETIC CORES
A process and a blanking mold are described for the production of a ferromagnetic core for electric motors formed by a plurality of segments. The laminations are blanked from a sheet of ferromagnetic material and stacked in an accumulation chamber of the blanking mold, along which they advance until a segment constituted by a stack having a preset number of laminations is formed, which is mechanically connected to an adjacent segment, thereby forming a rectilinear sequence of segments. The segments are hinged to each other with the possibility of mutual rotation to allow the sequence of segments to be brought from the rectilinear condition to a closed circular configuration.
B21D 28/02 - Punching blanks or articles with or without obtaining scrapNotching
B21D 45/00 - Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
B21D 35/00 - Combined processes according to methods covered by groups
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
The present invention concerns a process and an apparatus for positioning blanks in a tool provided with at least one die, at least one locating device for centring the lamination and at least one stripper element for separating the blank from the locating device. The locating device has an engaging portion having shape and dimensions so as to engage the contour of a centring hole placed inside the profile of the lamination obtained as final product and having the shape of a portion previously blanked.
A process and a blanking mold are described for the production of a ferromagnetic core for electric motors formed by a plurality of segments. The laminations are blanked from a sheet of ferromagnetic material and stacked in an accumulation chamber of the blanking mold, along which they advance until a segment constituted by a stack having a preset number of laminations is formed, which is mechanically connected to an adjacent segment, thereby forming a rectilinear sequence of segments. The segments are hinged to each other with the possibility of mutual rotation to allow the sequence of segments to be brought from the rectilinear condition to a closed circular configuration.
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
A process and a blanking mold are described for the production of a ferromagnetic core for electric motors formed by a plurality of segments. The laminations are blanked from a sheet of ferromagnetic material and stacked in an accumulation chamber of the blanking mold, along which they advance until a segment constituted by a stack having a preset number of laminations is formed, which is mechanically connected to an adjacent segment, thereby forming a rectilinear sequence of segments. The segments are hinged to each other with the possibility of mutual rotation to allow the sequence of segments to be brought from the rectilinear condition to a closed circular configuration.
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
The present invention concerns a process for the blanking and/or stamping of laminations in a tool provided with at least one die (101), at least one locating device (103) for centring the lamination (B) and at least one stripper element (105) for separating the lamination from the locating device. There are provided the steps. of feeding a blank to the tool, stamping and/or blanking a portion of the blank and operating the stripper element to facilitate separation of the locating device from the stamped and/or blanked portion. Advantageously, the locating device engages with the blank in advance with respect to the punch (102) or the stripper element. Preferably, the locating device engages with the lamination in advance with respect to the punch and the stripper element engages with the lamination simultaneously with the punch or at a later stage. This allows centring of the lamination in the tool to be optimised before stamping or blanking. The process and relative tool are particularly suitable for the production of laminations for electric motors.
The present invention concerns a process and an apparatus for positioning blanks in a tool provided with at least one die (101), at least one locating device (103) for centring the blank (B) and at least one stripper element (105) for separating the blank from the locating device. The locating device has an engaging portion having shape and dimensions so as to engage the contour of a centring hole placed inside the profile of the lamination obtained as final product and having the shape of a portion previously blanked.
The present invention concerns a process and an apparatus for positioning blanks in a tool provided with at least one die (101), at least one locating device (103) for centring the blank (B) and at least one stripper element (105) for separating the blank from the locating device. The locating device has an engaging portion having shape and dimensions so as to engage the contour of a centring hole placed inside the profile of the lamination obtained as final product and having the shape of a portion previously blanked.
A mold houses a least one cutting die that defines a die axis. The mold has at least one punch aligned with the die axis and movable in a reciprocating manner that cooperates with the at least one cutting die to cut the laminate into the laminations by carrying out cutting steps. The mold has a centering device within the mold that locks the at least one cutting die into a desired position prior to each of the cutting steps. A punching movement of the at least one punch is coordinated with a feeding movement of the laminate to a location within the mold that is interposed between the at least one punch and the cutting die.
The present invention relates to a centering device for a cutting die in a mould. The die is supported by a sleeve rotating about the axis of the die. Advantageously, the device comprises at least two cavities formed on the side surface of the sleeve, which are spaced apart along a same circumference, and at least one wedge-like element that is fastened to the mould and can be alternatively engaged in one of said cavities of the sleeve, with a conical coupling, in order to lock the sleeve after a rotation of the same.
B21D 37/14 - Particular arrangements for handling and holding in place complete dies
H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
13.
Method for manufacturing a lamination for electric motor rotor
A method for manufacturing a lamination for electro motor rotors that have skew or helical slots by forming at least one boss on a face of the lamination and reducing a thickness of a first portion of the boss. The reduction in thickness may be by carrying out a localized narrowing of the thickness of the first portion and the boss may be manufactured by pressing the lamination. The localized narrowing may be carried out by misalignment of a die relative to a punch within a mould.
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
H02K 15/10 - Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes
14.
LAMINATIONS FOR ELECTRIC MOTORS AND A METHOD OF MANUFACTURING THE SAME
The present invention relates to a stackable lamination for rotors of electric motors having inclined or helical slots, and a method for manufacturing the lamination. The lamination comprises at least one boss projecting from a face thereof for coupling with a second lamination in the same pack. The two coupled laminations are rotated according to an offset angle. Advantageously, a boss portion has a lower thickness than the remaining portions to allow the same boss to be coupled with a matching boss of the second lamination, the two coupled bosses being angularly offset according to a preset angle. The reduction in the boss thickness is carried out during the manufacturing step of the lamination.
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
patents
