JP6065032B2 - Laminated core manufacturing method and laminated core - Google Patents

Description

  The present invention relates to a laminated iron core manufacturing method, a laminated iron core manufacturing apparatus, and a laminated iron core for producing a laminated iron core used for a motor or a generator by fastening a steel plate by using a caulking and an adhesive together.

  Generally, a laminated body (laminated iron core) of electromagnetic steel sheets is used as an iron core of a motor or a generator. In such a laminated iron core, it is necessary that the electromagnetic steel sheets constituting the laminated body be coupled (fastened) with a certain force or more when the motor or the generator is manufactured and used.

  As a method for fastening steel plates, there are fixing with bolts and welding, or adhesion between steel plates, and the most frequently used method for fastening steel plates is a method called caulking. Caulking is an extruding process for each steel plate by caulking punches, forming a convex shape partially on the opposite side of the steel plate from the caulking punch (the caulking punch side is a concave shape). This is a method of fixing the steel plates to each other by fitting the portions (convex shape portions). Such a convex portion is referred to as a dowel.

  Specifically, in the caulking process, the dowel formed in the pressing process of the iron core is moved up and down by aligning the position of the dowel in the next process inside the press mold or the next process provided outside the mold. The steel plates are integrated by applying pressure to the dowels to fit each other.

  In the laminated core manufactured by caulking in this way, if the fastening force between the laminated steel sheets is weak, the laminated core steel sheets peel off during the manufacture of the motor or generator, and the product (motor or Since the steel sheet of the laminated core peels off during use of the generator, this is not preferable. On the other hand, when the number of caulking points is increased so as to increase the fastening force between the steel plates, the magnetic properties of the iron core deteriorate due to the processing strain and elastic stress field around the dowel. Therefore, it is required to increase the fastening force per caulking point.

  The fastening force (peeling strength) by caulking is affected by the height of the dowel (caulking depth) and the clearance between the caulking punch that forms the dowel and the die hole. It is possible to do. However, there is a limit to increasing the height of the dowel. Further, as the height of the dowel is increased, the processing area around the dowel of the steel sheet is expanded, so that the magnetic properties of the steel sheet are deteriorated. In addition, there is a limit to the clearance adjustment for stable processing. Therefore, a technique for improving the peel strength without depending on these adjustments is expected.

  In addition to peel strength, securing the rigidity of the iron core is also important in terms of ensuring product reliability and reducing noise. That is, if the iron core is deformed by electromagnetic vibration or external force of the motor itself, it causes an increase in noise due to the vibration of the iron core. Furthermore, when the steel sheets of the laminated iron core are separated from each other due to deformation, not only the noise is increased, but also the long-term reliability of the product is lowered. Therefore, a technique for ensuring the rigidity of the iron core in addition to the peel strength is expected.

  It is known that it is effective to bond steel plates in order to ensure the peel strength and rigidity of the iron core material. However, various difficulties are involved in laminating and fixing after applying an adhesive to the entire surface of the inside of the mold. For example, when trying to bond the entire surface of the iron core material, if the amount of adhesive applied is large, not only will the space factor decrease, but the adhesive will leak from the end of the iron core, causing various troubles. . On the contrary, if the application amount of the adhesive is small, the adhesive force is not effectively secured. When applying a steel sheet having an adhesive insulating coating on the surface of an electromagnetic steel sheet, there are difficulties such as requiring high temperature and long time annealing.

  Then, the technique which adhere | attaches an iron core material partially, performing the fastening of an iron core by crimping is disclosed. For example, Patent Document 1 describes a technique in which an adhesive is used to fix a steel plate formed by alternately laminating and a jumped steel plate.

  Patent Document 2 discloses a technique for improving the magnetic characteristics of the iron core by preventing the insulation coating formed on the surface of the steel sheet from being destroyed during caulking, and an adhesive between the shearing surfaces of the caulking fitting portions. Techniques for injecting are described.

JP 2009-72014 A JP 2008-36671 A

  However, in the technique described in Patent Document 1, since the dowel position and the fixing position by the adhesive are different positions, the peel strength per caulking point cannot be increased. Moreover, although the reason for injecting an adhesive between the shearing surfaces of the caulking fitting portion is not disclosed in Patent Document 2, short-circuiting at the caulking fitting portion is prevented in view of the technical problem described in Patent Document 2. It is thought that the purpose is. In addition, in the technique described in Patent Document 2, the viewpoint of improving productivity and ensuring high iron core strength by applying an adhesive to a limited portion including a caulking fitting portion as intended by the present invention is as follows. However, as the method of applying the adhesive, only a method of allowing the adhesive to penetrate between the shear surfaces or a method of applying an adhesive coating is disclosed.

  This invention is made | formed in view of the above, Comprising: It aims at providing the laminated core manufacturing method and laminated core manufacturing apparatus which can manufacture the laminated core which has high peeling strength and rigidity. Another object of the present invention is to provide a laminated iron core having high peel strength and rigidity.

  In order to solve the above-described problems and achieve the object, the laminated iron core manufacturing method according to the present invention forms a convex dowel on each of a plurality of steel plates and integrates the dowels between the steel plates. A method for manufacturing a laminated iron core, comprising: a step of fixing the dowels to each other with an adhesive when fitting the dowels between the steel plates.

  Moreover, the laminated core manufacturing method which concerns on this invention WHEREIN: The height of the dowel at the time of making the said convex dowel project from the steel plate surface exists in the range of 105-400% of the plate | board thickness of the said steel plate in the said invention. It is characterized by.

  Moreover, the laminated iron core manufacturing method according to the present invention is characterized in that, in the above-mentioned invention, the adhesive is applied to a convex outer periphery of the dowel before the dowel is fitted.

  Further, in the laminated core manufacturing method according to the present invention, in the above invention, the region where the adhesive is applied and / or developed includes a circular region having a radius of 10 mm centered on the center position of the dowel and the center position of the dowel. It is characterized by being in the smaller region of the circular region having a radius that is the distance between the center position and the end of the laminated core.

  In the laminated core manufacturing method according to the present invention, the application area of the adhesive is 50% or less of the area of the steel sheet.

  Moreover, the laminated iron core manufacturing method according to the present invention is characterized in that, in the above invention, 80% or more of the plurality of dowels formed on the steel sheet is fixed with an adhesive.

  The laminated core manufacturing apparatus according to the present invention is a laminated core manufacturing apparatus in which convex dowels are formed on each of a plurality of steel plates, and the dowels of the steel plates are fitted and integrated, and the steel plates are integrated with each other. When the dowels are fitted, the dowels are provided with means for fixing the dowels with an adhesive.

  The laminated iron core according to the present invention is a laminated iron core in which convex dowels are formed on each of a plurality of steel plates, and the dowels of steel plates are fitted and integrated, and the dowels of the steel plates are fitted. The dowels are fixed with an adhesive.

  The laminated core according to the present invention is characterized in that, in the above-described invention, a height at which the convex dowel protrudes from a steel sheet surface is in a range of 105 to 400% of a thickness of the steel sheet.

  Further, in the laminated iron core according to the present invention, in the above invention, the region where the adhesive is applied and / or developed is centered on a circular region having a radius of 10 mm centered on the center position of the dowel and the center position of the dowel, It is characterized in that it is in the smaller one of the circular regions whose radius is the distance between the center position and the end of the laminated iron core.

  The laminated iron core according to the present invention is characterized in that, in the above invention, the application area of the adhesive is 50% or less of the area of the steel sheet.

  The laminated core according to the present invention is characterized in that, in the above invention, 80% or more of a plurality of dowels formed on the steel plate is fixed with an adhesive.

  The laminated iron core according to the present invention is characterized in that, in the above invention, the thickness of the steel sheet is 0.25 mm or less.

  In the above invention, the laminated core according to the present invention is characterized in that the diameter or the maximum length is larger than 100 mm.

  According to the present invention, a laminated iron core having high peel strength and rigidity can be obtained.

FIG. 1 is a schematic diagram showing a schematic configuration of a laminated core manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a cross section in the short side direction of the dowel of the laminated iron core of the present embodiment. FIG. 3 is a schematic diagram showing each part around the dowel in the present embodiment. FIG. 4 is a schematic diagram showing an application / progress region of the adhesive according to the present embodiment. FIG. 5 is a schematic diagram showing a schematic configuration of the iron core material of the present invention used for the peel strength measurement of this example. FIG. 6 is a schematic diagram showing a schematic configuration of a core material of a comparative example used for measurement of peel strength of this example. FIG. 7 is a schematic diagram showing a schematic configuration of the laminated core used in the peel strength test of this example. FIG. 8 is a diagram showing the peel strength ratio between the inventive example and the comparative example for each thickness of the iron core material of this example. FIG. 9 is a diagram showing the peel strength ratio between the inventive example and the comparative example for each dowel height of the iron core material of this example.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

  FIG. 1 is a schematic diagram showing a schematic configuration of a laminated core manufacturing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the laminated core manufacturing apparatus includes a mold 1, a caulking punch 2, and an adhesive discharge port 3. The mold 1 includes a lower mold 11 and an upper mold 12. A die hole 4 is formed in the lower mold 11 and an adhesive discharge port 3 is disposed. A fastening protrusion 5 is formed on the upper die 12 and the caulking punch 2 is disposed so as to be movable up and down. The crimping punch 2 has a V-shaped cross section in the long side direction of the tip, and forms a V-shaped dowel D. Thereby, this laminated core manufacturing apparatus manufactures the laminated iron core by V caulking.

  In this laminated core manufacturing apparatus, a steel plate (electromagnetic steel plate) S conveyed immediately above the die hole 4 formed in the lower die 11 is pushed into the die hole 4 by the caulking punch 2 lowered from the upper die 12. A convex dowel D is formed on the steel sheet S downward. Next, the dowel D of the steel sheet S is conveyed so as to be positioned directly above the adhesive discharge port 3, and the adhesive A discharged from the adhesive discharge port 3 is transferred from below the dowel D of the steel plate S to the dowel D. It is applied to the outer periphery of the convex shape. Next, the dowel D of the steel plate S is conveyed so as to be positioned directly below the fastening protrusion 5, and the dowel D is stacked on the previously conveyed steel plate S so as to overlap each other, and the fastening protrusion lowered from above 5, the dowel D is fitted to the dowel D of the lower steel sheet S. At that time, the dowels D are fixed to each other by the adhesive A applied from below the dowels D. In this way, the steel plates S are fastened together by the combined use of V-caulking and the adhesive A.

  In this way, when the inside of the dowel D (the inner and outer peripheries of the upper and lower dowels D) is fixed with the adhesive A, the direction of stress applied to the fixed portion is changed from the tensile (peeling) direction to the shearing direction. In addition, since the generation of the starting point of peeling at the dowel D is suppressed, the peel strength of the manufactured laminated iron core is increased.

  FIG. 2 is a schematic diagram showing a cross section in the short side direction of the dowel D of the fastened steel sheet S. FIG. In the following, as shown in FIG. 3, the respective peripheral parts of the dowel D are referred to as a dowel upper surface d1, a dowel lower surface d2, a dowel convex side surface d3, a dowel concave side surface d4, a steel plate upper surface c1, and a steel plate lower surface c2. As shown in FIG. 2, when the blocks of the steel plate S1 and the steel plate S2 and the block below the steel plate S3 are about to peel, a peeling force f1 indicated by an arrow in FIG. 2 acts between the steel plate S2 and the steel plate S3. . Further, the dowel convex side surface d3 and the dowel concave side surface d4 which are opposed to each other are fixed by the adhesive A, so that the side surface of the dowel D (the dowel convex side surface d3 and the dowel concave side surface d4) is filled. A shearing force f2 indicated by an arrow in FIG. In this case, it is considered that the peel strength is increased as compared with the case where the dowel convex side surface d3 and the dowel concave side surface d4 are not fixed and the steel plates S2 and S3 are about to peel apart.

  As described above, in the present invention, the adhesive adheres to the dowel concave side surface d4 and the dowel convex side surface d3 shown in FIG. 3, and the dowel concave side surface d4 and the dowel convex side surface d3 which face each other in the crimped state are fixed. It is important that Therefore, the present invention is preferably applied to V-caulking, and the height of the dowel protruding from the steel plate surface is preferably in the range of 105 to 400% of the plate thickness of the steel plate. This is because when the depth of the V-caulking exceeds the thickness of the steel plate, a portion where the side surface of the dowel is completely broken and separated (the dowel side surface gap portion in FIG. 3) is generated, and the adhesive penetrates and solidifies in this portion. This is because the bonding between the steel sheet and the adhesive is increased, and the peel strength is increased.

  Moreover, it is preferable that the area | region where an adhesive agent spreads in an iron core is made into the limited part centering on a dowel. This is because if the adhesive spreads over a wide range, the adhesive may ooze out from the end of the iron core and adhere to the mold, causing trouble. On the other hand, even if the adhesive does not reach the end of the iron core, if the adhesive application area is wide (the amount of adhesive applied is large), not only will the cost increase due to the use of many chemicals. The gap height between the layers becomes uneven, and the dimensional accuracy of the iron core tends to be poor. From these viewpoints, as shown in FIGS. 4A and 4B, the region where the adhesive is applied and / or developed is within a circular region R1 having a radius of 10 mm centering on the center position of the dowel D (FIG. 4). (A)) and the smaller one in the circular region R2 (FIG. 4B) centering on the center position of the dowel D and having a radius between the center position of the dowel D and the end of the iron core S1. It is desirable to be within the area of More preferably, the area where the adhesive is applied and / or developed is within a circular area R1 having a radius of 10 mm centered on the center position of the dowel D (FIG. 4A) and centered on the center position of the dowel D. It is set within the smaller region of the circular region R3 (FIG. 4C) having a radius that is a value obtained by subtracting 0.5 mm from the distance between the center position of D and the end of the iron core S1.

  Here, when the adhesive A is applied to the entire surface of the steel sheet S, as described above, various difficulties are involved in uniformly applying the minimum amount of the adhesive A to the entire surface of the steel sheet, and the adhesive A is used. Since the adhesive strength between the steel sheet S surfaces is strong, the effect of using caulking together hardly appears. Therefore, in the present invention, the adhesive A is applied to a portion of 50% or less of the area of the laminated core including the dowel D position. It should be noted that not all of the voids inside the individual dowels D need to be filled with the adhesive A. Moreover, the adhesive agent A should just be apply | coated to the dowel D of 80% or more of the whole laminated iron core.

  As described above, according to the laminated core manufacturing method and the laminated core manufacturing apparatus of the present embodiment, the laminated core in which the inside of the dowel D is fixed by the adhesive A using the minimum necessary adhesive. Can be manufactured. Thereby, the laminated iron core which has higher peeling strength and rigidity than the laminated iron core fastened only by the frictional force of fitting of the dowels D can be obtained.

  In addition, according to the laminated core manufacturing method and the laminated core manufacturing apparatus of the embodiment, since the adhesive A is applied on the opposite surface of the fastening protrusion 5, troubles due to the adhesive A adhering to the mold 1 are caused. Can be prevented.

  In particular, in the laminated iron core manufactured using a thin steel sheet S having a thickness of 0.25 mm or less, the strength at the dowel D position is lowered, so that the peel strength is lowered. However, the laminated iron core manufacturing method according to the present embodiment According to the laminated core manufacturing apparatus, the peel strength can be improved.

  The present invention can be applied to any normal caulking method such as round caulking with a rounded convex dowel D in addition to the above-described V caulking.

  Moreover, the laminated iron core manufactured by this invention is effective for a big iron core in which a diameter (or maximum length) exceeds 100 mm. This is because when the outer diameter of the iron core is large, when a local stress acts on the iron core, the distance from the point of application to the fastening point becomes longer, so the torque acting as a peeling force increases, and the iron core material peels off. This is because it tends to occur and the amount of deformation accompanying a decrease in the rigidity of the iron core also increases.

  Moreover, the laminated iron core manufactured by this invention is suitable also for the iron core for motors or generators. This is because the iron cores for motors and generators are noisy due to electromagnetic vibrations, are resistant to vibrations, require long-term reliability, and require a strong fastening force.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these embodiments. Various modifications according to specifications and the like are within the scope of the present invention. It is obvious from the above description that various other embodiments are possible within the scope of the above.

[Example]
In this embodiment, the motor core shown in FIG. 5 (stator core having a diameter of 120 mm) is used as an example of the present invention by using the electromagnetic steel sheet having the thickness shown in Table 1 as the iron core material and using the laminated core manufacturing apparatus shown in FIG. Manufactured and measured peel strength. The dowel D was formed at a position indicated by a rectangle in FIG. 5, and the area ratio of the area of the application region of the adhesive A indicated by a circle around the dowel D to the area of the iron core was calculated. The height of the dowel was set to various conditions as shown in Table 1. Further, as a comparative example, the motor core shown in FIG. 6 was manufactured, and the peel strength was measured in the same manner. The motor core of the comparative example shown in FIG. 6 is different from the motor core of the example of the present invention shown in FIG. 5 only in that the same amount of adhesive A is applied to a position indicated by a circle away from the dowel D position. The height in the stacking direction of the iron cores shown in FIGS. 5 and 6 was 50 mm. As the peel strength, as indicated by an arrow in FIG. 7, the iron core (motor core) was pulled parallel to the axial direction, and the force when the peel occurred was measured.

  Table 1 shows the measurement results of the peel strength for each thickness of the iron core material. FIG. 8 shows the peel strength ratio between the present invention example and the comparative example for each sheet thickness of the iron core material, and FIG. 9 shows the peel strength ratio between the present invention example and the comparative example for each dowel height. As shown in Table 1, in the example of the present invention, when the area ratio of the adhesive application region is the same, a higher peel strength can be obtained than the comparative example in which the adhesive is applied at a position away from the dowel D position. confirmed. Further, as shown in FIG. 8, when a steel plate having a plate thickness of 0.25 mm or less is used, or when the dowel height is 105% or more as shown in FIG. It was confirmed that a high effect was obtained.

1 Mold 11 Lower mold 12 Upper mold 2 Caulking punch 3 Adhesive outlet 4 Die hole 5 Protrusion for fastening S Steel plate (Electromagnetic steel plate)
D Dowel A Adhesive

Claims (11)

It is a laminated core manufacturing method in which a convex dowel is formed on each of a plurality of steel plates, and the dowels between steel plates are fitted and integrated,
When fitting the dowels of the steel sheets, it viewed including the step of securing said dowels together with an adhesive,
The method for producing a laminated core , wherein the dowel is V-shaped, and the height at which the dowel protrudes from the surface of the steel sheet is in the range of 105 to 400% of the thickness of the steel sheet . The method for manufacturing a laminated iron core according to claim 1 , wherein the adhesive is applied to a convex outer periphery of the dowel before the dowel is fitted. An area where the adhesive is applied and / or developed is centered on a circular area having a radius of 10 mm centered on the center position of the dowel and the center position of the dowel, and between the center position and the end of the laminated core. 3. The method of manufacturing a laminated core according to claim 1, wherein the method is within a smaller region of circular regions having a radius as a distance. The method for manufacturing a laminated core according to any one of claims 1 to 3 , wherein an application area of the adhesive is 50% or less of an area of the steel plate. The laminated core manufacturing method according to any one of claims 1 to 4 , wherein 80% or more of the plurality of dowels formed on the steel plate is fixed with an adhesive. Convex dowels are formed on each of a plurality of steel plates, and the dowels of steel plates are fitted and integrated into a laminated iron core,
The dowels of the steel plates are fitted, the dowels are fixed with an adhesive, the shape of the dowels is V-shaped, and the height at which the dowels protrude from the surface of the steel plate is 105 to the thickness of the steel plate. A laminated iron core characterized by being in the range of 400% . An area where the adhesive is applied and / or developed is centered on a circular area having a radius of 10 mm centered on the center position of the dowel and the center position of the dowel, and between the center position and the end of the laminated core. The laminated core according to claim 6 , wherein the laminated iron core is in a smaller one of circular regions having a radius as a distance. The laminated iron core according to claim 6 or 7 , wherein an application area of the adhesive is 50% or less of an area of the steel plate. The laminated iron core according to any one of claims 6 to 8 , wherein 80% or more of the plurality of dowels formed on the steel plate is fixed with an adhesive. The laminated iron core according to any one of claims 6 to 9 , wherein a thickness of the steel plate is 0.25 mm or less. The laminated iron core according to any one of claims 6 to 10, wherein a diameter or a maximum length is larger than 100 mm.

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