JP3276505B2 - Manufacturing method of laminated adhesive core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated bonded core such as a stator core or a rotor core constituting an electric motor.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a laminated adhesive core of this type, first, an electromagnetic steel sheet having an adhesive layer coated on its surface is punched into a predetermined shape by press molding to form an adhesive steel sheet for lamination. The lamination adhesive steel sheet is laminated via the adhesive layer, and the laminated steel sheet is pressure-bonded.

When a magnetic steel sheet is punched by press forming, burrs are formed on the cut surface of the punched laminated steel sheet by projecting from the laminated surface of the laminated steel sheet in the laminating direction. However, the burrs are sharp and dangerous and require careful handling.In addition, since the burrs protrude in the laminating direction, poor adhesion may occur when laminating the adhesive steel sheets for lamination, and distortion or the like may occur during crimping. As a result, the accuracy of the stack height is deteriorated. Further, in the rotor core, the winding may be damaged. Therefore, conventionally, burrs generated on the cut surface of the adhesive steel sheet for lamination are treated as follows.

That is, since the amount of protrusion of the burr generally increases with the wear of the punching blade of the press device, the amount of protrusion of the burr is reduced by grinding the punching blade, or the burr is directly ground. Has been removed.

However, in the case of the former, not only must the operation of the press device be stopped when performing the grinding correction of the punching blade, but also the grinding correction requires a great deal of labor and time, and furthermore, the burrs are completely removed. The problem described above cannot be essentially solved because it is not removed.

On the other hand, in the latter case, the burrs can be completely removed, but the work is extremely difficult since the laminated adhesive steel sheets mass-produced by pressing must be ground one by one. It is troublesome. Therefore, in any case, the operation of processing burrs from the adhesive steel sheet for lamination is very troublesome, and causes a decrease in productivity of a laminated adhesive core formed by laminating the adhesive steel sheets for lamination.

In this case, as shown in FIG. 4, the laminated adhesive steel sheet a formed by punching is housed in the concave portion e of the lower mold d with the laminated surface c on the side where the burr b projects downward. It is conceivable that the burr b is instantaneously treated by pressing the lamination adhesive steel sheet a with the upper die f and vertically crushing the burr b on the bottom surface of the concave portion e. Since the burr b protrudes from the lamination surface c, the burr b cannot be completely removed. As shown in FIG. 5, an inclined surface i is formed in the entire circumferential direction between the lower portion of the inner peripheral surface h of the concave portion e and the bottom surface, and is housed in the concave portion e when pressed by the upper die f. It is conceivable that the burr b of the laminated adhesive steel sheet a is crushed while being wound inward by the inclined surface i and is crushed instantaneously, but in this case, the burr b is inwardly wound by the inclined surface i. On the other hand, the burr b is broken by a shearing force, scatters on the lower surface of the lamination surface c, is crushed by the lower surface of the lamination surface c, and adheres and remains.
As described above, the burrs b protrude from the lamination surface c, so that the burrs b cannot be completely removed as described above.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned disadvantages, and it has been found that a burr generated on an adhesive steel sheet for lamination can be treated in a short time and surely so that a high-quality laminating adhesive can be obtained. An object of the present invention is to provide a method for manufacturing a laminated adhesive core that can efficiently manufacture an iron core.

[0009]

According to the present invention, in order to achieve the above object, an electromagnetic steel sheet having an adhesive layer coated on its surface is punched into a predetermined shape by press molding to form an adhesive steel sheet for lamination. The burrs generated by projecting in the thickness direction from the lamination surface of the adhesive steel sheet for lamination to the cut surface of the adhesive steel sheet for lamination at the time of the punching are processed by burr processing means, and then the burr is treated for the lamination. A method for producing a laminated adhesive core by laminating an adhesive steel sheet via the adhesive layer and pressing the laminated adhesive steel sheet, wherein the burr processing means comprises: A mold in which a concave portion to be stored with the surface facing down is formed, and the laminated steel sheet for lamination accommodated in the concave portion is pressed in a thickness direction so that the laminated surface of the laminated steel sheet is laminated to the concave portion. Press against the bottom of And a slanted surface formed so that the burr is wound inward when pressed by the pressing means, at a portion corresponding to the burr generation portion of the adhesive steel sheet for lamination accommodated in the recess. Formed all around the direction,
On the bottom surface on the inner side of the inclined surface, a convex portion is formed on the entire circumference in the circumferential direction, and the surface of the convex portion on the side facing the inclined surface moves the tip of the burr as the molding proceeds. It is a guide surface for guiding to the lamination surface, and the lowermost portion of the guide surface and the inclined surface is arranged so as not to protrude from the bottom surface in the burr protruding direction, and when the molding is completed, the convex portion bites into the lamination surface And the burrs are buried between the guide surface and the inclined surface.

Further, the present invention is characterized in that a lowermost portion of the inclined surface and the guide surface is continuous, and a substantially V-shaped groove is formed by the inclined surface and the guide surface. .

[0011]

According to the present invention, a laminated adhesive steel sheet punched into a predetermined shape by press forming is housed in a concave portion of a mold with a laminated surface on a side where burrs protrude face down. Next, the laminating adhesive steel plate is pressed by pressing means to press the lamination surface of the laminating adhesive steel plate against the bottom surface of the concave portion. At this time, the molding is started so that the inclined surface winds the burr inward,
As the molding proceeds, the guide surface of the projection guides the tip of the burr toward the lamination surface. When a burr is broken by a shearing force acting on the burr during molding, the broken burr is secured between the inclined surface and the guide surface. Then, when the molding is completed, the projections are cut into the laminated surface, and the burrs are buried between the guide surface and the inclined surface. At this time, since the lowermost part of the guide surface and the inclined surface is arranged so as not to protrude from the bottom surface in the burr protruding direction, the burr is apparently completely removed from the laminating surface of the laminated adhesive steel sheet. Protruding burrs are well treated. Then, a laminated adhesive steel sheet subjected to burrs treatment is laminated via an adhesive layer, and the laminated adhesive steel sheet is pressure-bonded to produce a laminated adhesive core.

In this case, when a substantially V-shaped groove is formed by the inclined surface and the guide surface so that the lowermost portion of the inclined surface and the guide surface are continuous, a burr formed by the inclined surface and the guide surface is formed. The molding proceeds well.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic view of a main part of a laminated adhesive core manufactured by a method of manufacturing a laminated adhesive core according to an embodiment of the present invention, and FIG. 2 is an explanatory view for explaining a burr processing step which is a main part of the present invention. It is a schematic diagram. In this embodiment, a stator core of an electric motor is taken as an example of the laminated adhesive core.

To manufacture the stator core 1 shown in FIG.
First, an electromagnetic steel sheet 3 coated on both sides with a thermoplastic adhesive layer 2 is punched into a predetermined shape by a progressive press machine (not shown) to form an adhesive steel sheet 4 for lamination. At the time of punching, a burr 7 (FIG. 2) protrudes from the lamination surface 6 of the lamination adhesive steel plate 4 in the thickness direction to the cut surface 5 of the lamination adhesion steel plate 4.
Since (b) occurs, the burr 7 is processed by the burr processing means 8 shown in FIG. Next, the lamination adhesive steel sheet 3 on which the burr 7 has been treated is laminated via the thermoplastic adhesive layer 2, and pressure is applied thereto in a laminating direction by a press or a vice while performing low frequency induction heating. I do. Thereby, the stator core 1 is manufactured.

Next, the burr processing step which is a main part of the present invention will be described in detail.

FIG. 2 shows a process of processing the burr 7 by the burr processing means 8. The burr processing means 8 includes:
A lower mold 10 in which a concave portion 9 is formed on the upper surface, in which the laminated adhesive steel plate 4 is stored with the laminated surface 6 on the side where the burr 7 protrudes downward, and the laminated adhesive steel plate 4 stored in the concave portion 9 Is a type of press device provided with an upper die 12 (pressing means) for pressing the laminated surface 6 of the laminated adhesive steel sheet 4 against the bottom surface 11 of the concave portion 9 by pressing the laminated surface 4 in the thickness direction.

The concave portion 9 has a shape corresponding to the adhesive steel sheet 4 for lamination, and its inner peripheral wall surface 13 has the inner peripheral wall 13 when the adhesive steel sheet 4 for lamination is stored and when pressed by the upper die 12. The guide surface guides the cut surface 5 in the thickness direction. Between the inner wall surface 13 and the bottom surface 11 of the concave portion 9, an inclined surface 14 formed so as to wind the burr 7 inward when pressed by the upper die 12 is formed in the entire circumferential direction. The lowermost part of the inclined surface 14 is flush with or slightly above the bottom surface 11. Further, at a position near the inclined surface 14 of the bottom surface 11, a convex portion 15 is formed on the entire circumference in the circumferential direction.

The convex portion 15 has a triangular cross section, and a surface facing the inclined surface 14 has a guide surface 16 for guiding the tip of the burr 7 to the laminating surface 6 as the molding proceeds. It has been. Further, the lowermost part of the guide surface 16 and the inclined surface 14 is continuous, and the guide surface 16 and the inclined surface 14
A groove is formed. At the top of the convex portion 15, a blade portion 17 that can bite into the lamination surface 6 of the adhesive steel plate 4 for lamination is formed.

In order to treat the burr 7 using the burr treatment means 8, first, as shown in FIG. 2 (a), the stamped and formed lamination adhesive steel plate 4 is laminated on the lamination surface on the side where the burr 7 protrudes. The lower mold 6 is housed in the recess 9 of the lower mold 10 with the lower side of the lower mold 6.
During storage, the tip of the burr 7 is placed on the boundary between the inner wall surface 13 and the inclined surface 14. In this state, the upper die 12 is lowered to press the laminated adhesive steel sheet 4.

At this time, as shown in FIG.
Is formed while being rolled inward along the inclined surface 14, and as the forming proceeds, the burr 7 is rolled inward while the tip thereof is formed on the laminated surface 6 by the guide surface 16 of the projection 15. It is guided toward (see FIG. 2 (c)).
At the time of molding, the V-shaped groove is formed by connecting the guide surface 16 and the inclined surface 14 at the lowermost part thereof, so that the molding of the burr 7 by the surfaces 16 and 14 is excellent. Be advanced. In addition, when a shearing force acts on the burr 7 and the burr 7 is broken, the broken burr 7 is secured between the inclined surface 14 and the guide surface 16.

Then, as shown in FIG. 2D, in a state where the lamination surface 6 of the adhesive steel sheet 4 for lamination is pressed against the bottom surface 11 of the concave portion 9, the blade portion 17 of the projection 15 is in contact with the lamination surface 6. The burr 7 is buried between the guide surface 16 and the inclined surface 14 in a crushed state. At this time, since the inclined surface 14 and the guide surface 16 are both flush with the bottom surface 11 or slightly above as described above, the burr 7 is apparently completely removed without protruding from the laminated surface 6. Thus, the burrs 7 protruding from the lamination surface 6 are favorably treated.
Accordingly, by laminating the laminated adhesive steel sheet 4 on which the burr 7 has been treated by the burr treatment means 8 via the thermoplastic adhesive layer 2 as described above, and performing pressure bonding thereto while performing low-frequency induction heating, A high quality stator core 1 excellent in accuracy can be manufactured. FIG. 3 shows another embodiment of the burr forming. In this case, the burr 7 is provided on the guide surface 1.
6 is buried between the inclined surface 14 and the guide surface 16 in a state of being crushed by the inclined surface 14 without being guided by 6.

In such a method of manufacturing a stator core,
The processing of the burrs 7 generated in the adhesive steel sheet 4 for lamination by punching by press molding is performed by using the lower die 1
0 can be instantaneously performed simply by pressing the laminated adhesive steel plate 4 with the upper mold 12 while being housed in the recess 9 of the “0”, so that the time and labor required for the burr treatment can be remarkably reduced as compared with the related art. Moreover, since the burrs 7 are apparently completely removed, it is possible to efficiently manufacture a high-quality stator core having excellent precision.

The present invention is not limited to the above embodiment, but can be appropriately modified without departing from the gist of the present invention. For example, in the above embodiment, the inclined surface 14 is formed in a flat shape, but the inclined surface 14 may be formed in a curved shape instead.

In the above embodiment, the convex portion 15 is formed in a triangular cross section. However, the present invention is not necessarily limited to this, and the guide surface 16 of the convex portion 15 is The leading end is guided to the lamination surface 6 and the projection 15
Any other shape may be adopted as long as it can bite into the lamination surface 6.

Further, in the above-described embodiment, the V-shaped groove is formed by the guide surface 16 and the inclined surface 14 by making the lowermost part of the guide surface 16 and the inclined surface 14 continuous. Instead, the bottom surface 11 may be interposed between the lowermost portion between the guide surface 16 and the inclined surface 14.

[0026]

As is apparent from the above description, according to the present invention, it is possible to instantaneously treat the burrs generated on the laminated adhesive steel sheet by stamping and to remove the burrs apparently completely. Since it can be processed in a state where it has been processed, the time and labor required for burr processing can be remarkably reduced as compared with the related art, and a high-quality laminated adhesive core having excellent precision can be efficiently manufactured.

In the case where a substantially V-shaped groove is formed by the inclined surface and the guide surface so that the lowermost portion of the inclined surface and the guide surface are continuous, a burr is formed by the inclined surface and the guide surface. Satisfactorily proceeds, so that the above-described burr treatment can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a stator core manufactured by a method for manufacturing a laminated adhesive core according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory schematic views for explaining a burr treatment step, which is a main part of the present invention, and FIG. 2A is a diagram showing a state in which an adhesive steel sheet for lamination is housed in a concave portion of a mold; Is a diagram showing a state in which the formation of burrs is started by the inclined surface, (c) is a diagram showing a state in which the tip of the burr is guided toward the lamination surface by the guide surface as the forming proceeds, (d) () Is a diagram showing a state in which molding is completed.

FIG. 3 is an explanatory diagram for explaining another aspect of burr molding.

FIG. 4 is an explanatory diagram for explaining a conventional example.

FIG. 5 is an explanatory diagram for explaining a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator core, 2 ... Thermoplastic adhesive layer, 3 ... Electromagnetic steel plate, 4 ... Laminated adhesive steel plate, 5 ... Cut surface, 6 ... Laminated surface, 7
Burrs, 8 burrs, 9 recesses, lower mold, 1
1 ... bottom surface, 12 ... upper mold, 13 ... inner wall surface, 14 ... inclined surface,
15 ... convex part, 16 ... guide surface, 17 ... blade part,

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-38103 (JP, A) JP-A-4-331444 (JP, A) JP-A-48-54436 (JP, A) JP-A-6-54436 165447 (JP, A) Hikaru Hei 3-26249 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 15/00-15/02 H02K 15/04-15/16 H02K 1/00-1/16 H02K 1/18-1/26 H02K 1/28-1/34

Claims (2)

(57) [Claims] 1. An electromagnetic steel sheet having an adhesive layer coated on its surface is punched into a predetermined shape by press molding to form an adhesive steel sheet for lamination. Burrs generated by projecting in the thickness direction from the lamination surface of the adhesive steel sheet are processed by a burr processing means, and then the lamination adhesive steel sheet treated with the burr is laminated via the adhesive layer and pressed. A method for manufacturing a laminated adhesive core, wherein the deburring means is formed of a metal having a concave portion in which the laminated steel sheet is stored with the laminated surface on the side where the burrs protrude face down. A mold, and pressing means for pressing the laminated steel sheet for lamination stored in the concave portion in the thickness direction to press the laminated surface of the laminated steel sheet for lamination against the bottom surface of the concave portion. Adhesive steel for lamination In the portion corresponding to the burr occurrence portion, an inclined surface formed so as to wind the burr inward when pressed by the pressing means is formed in the entire circumferential direction, and on the bottom surface inside the inclined surface. The convex portion is formed on the entire circumference in the circumferential direction, and the surface of the convex portion facing the inclined surface is a guide surface for guiding the tip of the burr to the laminating surface as the molding proceeds. The lowermost part of the guide surface and the inclined surface is disposed so as not to protrude from the bottom surface in the burr projecting direction, and when the molding is completed, the convex portion is cut into the laminated surface, and the guide surface and the inclined surface are formed. Wherein the burr is buried between the laminated cores. 2. The laminated adhesive according to claim 1, wherein a lowermost portion of the inclined surface and the guide surface is continuous, and a substantially V-shaped groove is formed by the inclined surface and the guide surface. Iron core manufacturing method