JP5285020B2 - Laminated iron core and manufacturing method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a technique for enabling a laminated iron core used for a rotating electrical machine and a stationary machine, in which a magnetic steel sheet is punched with a metal mold and aligned and bonded and laminated.

  As is well known, many techniques have conventionally been proposed in which magnetic steel sheets are punched with a die as a thin iron core sheet, and are measured and aligned to form a laminated iron core.

  Conventionally, electromagnetic steel sheets are used for laminated iron cores of rotating electrical machines and stationary machines. Normally, electromagnetic steel sheets are punched out with progressive dies, etc., aligned and measured, and fixed by caulking or welding to form laminated iron cores. Proposed.

  In such a method, after the laminated core is formed, the laminated core is annealed in order to remove the strain caused by press working.

  As an alternative to the laminating method by caulking or welding, an adhesive laminating method using an adhesive has been proposed, but super heat resistant adhesives cannot be used for laminating in a progressive die and instantaneous curing, and the laminated core is strain-relieved. Annealing is not possible. (Patent Document 1)

  As a method for manufacturing a laminated core with an adhesive, there has been proposed a method in which an adhesive is impregnated, compressed and cured after an annealing process for strain relief to obtain an adhesive laminated core.

In order to solve the above-described problem of annealing of the laminated adhesive core, a magnetic steel sheet with a super heat-resistant adhesive has been proposed. (Patent Document 2)
JP 2001-25218 A International publication WO-A1-2006043612

  The above-described laminated iron core according to the prior art further has problems in the following points.

  In other words, in the case of laminated iron cores, the use of thinner electrical steel sheets has been studied to improve the efficiency of stationary machines and rotating electrical machines, and the issue is how to make a laminated iron core with less iron loss due to eddy currents. It is.

  That is, in the laminating method by caulking, the thickness of the electromagnetic steel sheet that can be laminated becomes lower because the caulking strength becomes lower as the thickness becomes thinner.

  Further, the conventional laminated manufacturing method of laminated iron cores by caulking or welding has a drawback that the magnetic characteristics are deteriorated due to an electrical short circuit at the caulking or welding location.

  In addition, as an alternative to the laminating method by caulking or welding, an adhesive laminating method using an adhesive has been proposed, but a super heat resistant adhesive with a long curing time can be used for laminating in a progressive mold and instantaneous curing. It cannot be annealed to remove strain from the laminated core.

  In addition, the progressive mold is complicated and expensive because of the structure in which it is laminated in the progressive mold and bonded instantaneously.

  In addition, laminated iron cores made of these adhesives should be punched with a metal mold, etc., and thinned, and after annealing for strain removal, the adhesive should be impregnated, compressed, and cured to form an adhesive laminated core. However, a separate jig is required for the alignment and lamination of the iron core thin plates, and the workability is poor, making it unsuitable for mass production.

  In order to solve the above-mentioned problem of the laminated iron core, a magnetic steel sheet with super heat-resistant adhesive has been proposed. However, the thermosetting of the adhesive cannot be performed in a progressive die, and it is bonded in a later process. Annealing is performed for curing and strain relief of the agent, and at that time, a jig for alignment and lamination is required.

  When using electrical steel sheets with super heat-resistant adhesive, in order to perform the heat curing and annealing processes for adhesive lamination without using an alignment lamination jig, a laminated iron core must be formed by caulking in a progressive die. However, there is a drawback that the laminated thin plates are electrically short-circuited to deteriorate the magnetic characteristics.

  An object of the present invention is to provide an excellent laminated iron core and a method for producing the same by solving the above problems.

  In order to solve the above object, the present invention has the following technical means.

  That is, using the reference numerals in the accompanying drawings corresponding to the embodiments, the present invention relates to a laminated core obtained by punching electromagnetic steel sheets with a progressive die, etc., and measuring and aligning the laminated cores. One or a plurality of tabs 3 having one or a plurality of constrictions 4a continuous with a minute width are formed at an arbitrary position with respect to the outer side of the outline of the shape of the thin plate A, and the tabs 3 are formed at one or a plurality of locations. A laminated iron core characterized by being bonded and laminated by caulking 5 or welding 6 or both is considered.

  Further, in a laminated iron core obtained by punching out electromagnetic steel sheets with a progressive die, measuring and aligning and laminating, a constriction 4a continuous with a fine width is formed with respect to the outer side direction of the core sheet A shape of the laminated iron core. A plurality of tabs 3 having one place or a plurality of places are formed at arbitrary positions, and the tabs 3 are connected by a constriction 4b so as to be continuous with a fine width, and the tabs 3 are caulked at one place or a plurality of places. A laminated iron core characterized by being stuck and laminated by 5 or weld 6 or both is considered.

  In addition, punching and weighing the core core-shaped thin plate from the electromagnetic steel sheet thin plate with a progressive die, etc., aligning and laminating the thin plate, fixing and laminating by caulking or welding, or both, and annealing the laminated core, The adhesive impregnating step, the laminated iron core compressing step, the protruding adhesive removing step, the adhesive curing step, and the tab cutting step, The manufacturing method according to any one of the laminated cores is considered.

  Based on the above-described configuration of the present invention, it is possible to manufacture a bonded laminated iron core in any thin steel sheet.

  Also, based on the above configuration of the present invention, the laminated iron core can be annealed without using an ultra-high temperature heat-resistant adhesive, although it is an adhesive laminated iron core, shear strain during punching, plastic deformation strain during caulking, end face Thermal distortion during welding can be removed, and deterioration of magnetic properties can be prevented.

  Also, based on the above configuration of the present invention, punching and measurement, stacking and temporary fixing of electrical steel sheets can be performed in a progressive die, so that it is not necessary to use a stacking fixture jig in the subsequent process, making the work easy and mass production. It is possible to do.

  Furthermore, based on the above-described configuration of the present invention, the manufactured laminated core has no caulking and welded portions on the end faces, and insulation between the thin sheets of the electromagnetic steel sheet is maintained, thereby enabling a laminated core having excellent magnetic properties. .

  Based on the above configuration, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show a laminated iron core considered by the present inventor, that is, a laminated iron core obtained by punching electromagnetic steel sheets with a progressive die, etc., and laminating them by measuring and aligning them. One tab 3 having one or a plurality of constrictions 4a that are continuous with a fine width with respect to the outer side of the outline of the shape of the core sheet A of the iron core is placed at an arbitrary position that has little influence on the magnetic circuit or does not interfere with the design. Alternatively, a laminated core characterized in that a plurality of tabs 3 are formed and the tabs 3 are fixed by caulking 5 and / or welded portions 6 at one place or plural places is considered.

  That is, one or a plurality of tabs 3 having one or a plurality of constrictions 4a continuous with a minute width are formed at an arbitrary position with respect to the outer direction of the outline of the core sheet A of the laminated core. A laminated iron core characterized in that is fixed by caulking 5 at one place or plural places is considered.

  Or the laminated iron core characterized by changing the tab 3 into the crimping 5 and fixing the end surface of one place or several places with the welding part 6 is considered.

  Alternatively, a laminated iron core characterized in that one or a plurality of places are fixed by caulking the tab 3 and the welded portion 6 is considered.

  FIG. 3 shows an example of an embodiment of the present invention, that is, in a laminated core obtained by punching electromagnetic steel sheets with a progressive die, etc., and measuring and aligning them, and the core sheet of the laminated core. A plurality of tabs 3 having one or a plurality of constrictions 4a continuous with a fine width with respect to the outer side of the contour of the A shape are formed at arbitrary positions that have little influence on the magnetic circuit or do not disturb the design, Further, the tabs 3 are connected to each other by a constriction 4b so as to be continuous with a fine width, and the tabs 3 are fixed by one or a plurality of caulks 5 or welds 6 or both. A laminated iron core is considered.

  That is, a plurality of tabs 3 having one or a plurality of constrictions 4a continuous with a minute width are formed at arbitrary positions with respect to the outer direction of the outline of the core sheet A of the laminated iron core. The laminated iron core is characterized in that the tabs 3 are connected by the caulking 5 at one place or a plurality of places.

  Or the laminated iron core characterized by changing the tab 3 into the crimping 5 and fixing the end surface of one place or several places with the welding part 6 is considered.

  Alternatively, a laminated iron core characterized in that one or a plurality of places are fixed by caulking the tab 3 and the welded portion 6 is considered.

  FIG. 4 is an example of an embodiment when a tooth is manufactured in a split core iron core.

  FIG. 5 shows an example of an example of an adhesively laminated iron core. When a laminated iron core product is produced, the tab 3 is mechanically cut or the constricted 4a is bent and cut.

<Aligned lamination process>
In the progressive metal mold, in the process of forming the caulking 5 in the progressive metal mold on the tab 3 of the thin iron sheet A formed on the electromagnetic steel sheet thin plate, and punching and measuring the thin sheet to obtain the laminated iron core. , And caulking 5 can be easily positioned and aligned and stacked.

<Caulking and welding process>
In the progressive die, the caulking 5 of the tabs 3 of the electromagnetic steel sheet thin plates that are aligned and laminated can be fixed easily to form a laminated core, but welding in the die is also conceivable.

<Annealing process>
Since the laminated iron core is fixed by the caulking 5 and / or the welded portion 6 and maintains strength capable of moving and transporting, the annealing process of the laminated iron core is easy.

  In addition, when the super heat resistant adhesive is coated on the magnetic steel sheet in advance, it is considered that the annealing process is performed after the adhesive curing process.

<Adhesive impregnation step>
Since the laminated iron core is fixed by the caulking 5 and / or the welded portion 6 and maintains strength capable of moving and transporting, the process of impregnating the laminated iron core with the adhesive is easy.

  When the super-heat-resistant adhesive is coated on the magnetic steel sheet in advance, the adhesive impregnation step and the adhesive removal step can be omitted.

<Adhesive removal process>
Since the laminated iron core is fixed by the caulking 5 and / or the welded portion 6 and has a strength capable of moving and transporting, it is easy to remove the adhesive that protrudes by compressing the laminated iron core. As the removal method, methods such as suction of the adhesive, blowing off, and wiping are considered.

  Adhesive suction and blow-off methods, which are adhesive removal methods, are considered best from the viewpoint of resource saving because the adhesive can be recovered.

<Curing process of adhesive>
The laminated core from which the adhesive that has been compressed and removed is fixed by the caulking 5 weld 6 of the tab 3, and the adhesive can be made into an adhesive laminated core by performing a process such as heat curing of the adhesive as it is.

  Moreover, when the super-heat-resistant adhesive is coated in advance on the magnetic steel sheet, it is considered that an annealing process is performed after the adhesive curing process.

<Tab excision process>
The constricted portion 4a4b of the tab 3 is cut out from the iron core that has been cured by heat curing or the like and has become an adhesive laminated iron core to obtain an adhesive laminated iron core.

  In the cutting process of the constricted portions 4a and 4b of the tab 3, cutting by a machine using a cutter or a rotary cutter or the bending by bending the constricted portions 4a and 4b is considered.

  The above is a form of a specific example, but is merely an example and is not limited to this embodiment, that is, a magnetic laminate such as a stator of a rotating electrical machine, a rotor, a stationary machine such as a core of a transformer. Any shape can be used.

  Further, the laminated laminated iron core is not limited to a straight groove type laminated core, and even a skewed laminated core can be dealt with by making the shape of the tab 3 wide or wide.

  Further, since the caulking 5 or the welded portion 6 of the present case is cut together with the tab 3 in the cutting process of the tab 3, it is not necessary to worry about a short circuit or the like of the magnetic steel sheet, and it should be physically firmly fixed. However, any type of caulking or welding such as V caulking, dowel caulking, caulking, pin caulking, etc. is possible.

  As described above, in the laminated iron core that is a product, no matter how thin the electromagnetic steel sheet is, no caulking is made on the product plane of the laminated iron core, or no weld is formed on the end face, and annealing is performed. This is a bonded laminated iron core that is capable of obtaining ideal magnetic characteristics, and a method for manufacturing the same.

It is a top view of the laminated iron core which this inventor considered. It is a top view of the laminated iron core which this inventor considered. It is a top view of the Example of this invention. It is the teeth part top view of the Example of the split core of the laminated iron core which this inventor considered. It is a perspective view of the laminated iron core which this inventor considered.

A Iron core thin plate 1 Back yoke 2 Teeth 3 Tab 4a Constriction 4b Constriction 5 Caulking 6 Welded part

Claims (1)

  In a laminated core formed by punching electrical steel sheets with a progressive die, measuring and aligning them, and laminating them, there is one contiguous constricted portion with a fine width or in the outer direction of the core thin plate shape of the laminated core. A plurality of tabs having a plurality of positions are formed at arbitrary positions, and the tabs are connected by a constricted portion so as to be continuous with a fine width, and the tabs are crimped or welded at one position or a plurality of positions, or both. A laminated iron core characterized by being stuck and laminated by

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