JP6707279B2 - Laminated iron core manufacturing method and laminated iron core manufacturing apparatus - Google Patents

Description

The present invention relates to a method for manufacturing a laminated core and an apparatus for manufacturing a laminated core in which an iron core piece is punched out from a strip-shaped steel sheet and laminated.

The laminated iron core in which a plurality of iron core pieces are laminated is formed by laminating and fixing the iron core pieces punched out from the band-shaped steel plates that are intermittently transferred. For example, Patent Document 1 describes a specific example in which each core piece is fixed by caulking or by an adhesive, and the core piece is fixed by the adhesive.
In the method described in Patent Document 1, an adhesive applying unit provided with an adhesive reservoir communicating with a plurality of ejection holes is provided in a lower mold (lower mold), and pressure is applied at a position having a distance to the lower mold. The adhesive is supplied from the device to the adhesive reservoir at a predetermined pressure, and the adhesive is extruded from a plurality of ejection holes and applied to the lower surface of the strip steel plate.

JP, 2013-48555, A

However, in the method described in Patent Document 1, it is difficult to stably apply a predetermined amount of adhesive to the lower surface of the strip-shaped steel sheet, and as a result, the amount of adhesive applied may be too large or may be insufficient. Therefore, there was a problem that the yield was generated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a laminated core and an apparatus for manufacturing a laminated core that suppress variations in the amount of adhesive adhered to a strip steel sheet.

A method for manufacturing a laminated core according to the first aspect of the present invention is a method for manufacturing a laminated core, in which a core strip is punched and laminated sequentially from a strip steel sheet that is intermittently transferred between an upper die and a lower die, A step A of applying the adhesive by bringing a protrusion at the lower end of an absorbent containing an adhesive into contact with the upper surface of a punching region of the strip-shaped steel plate where the iron core piece is punched, and a punch provided in the upper die. It has a step B of punching the core pieces from the punching region and a step C of stacking the punched core pieces, the absorber being mounted in the punch, descending with the punch, From above, the projection in a state of protruding downward comes into contact with the upper surface of the punching region immediately before the iron core piece is punched, and the absorber stores the adhesive sent by pressure from a feeder , The tanks contained in the punch are connected.

In the method for manufacturing a laminated core according to the first aspect of the present invention, in the uppermost punching region in which the core piece laminated on the top of the laminated core is punched, the absorber has the protrusions accommodated in the punch. It is preferable to descend without contacting the uppermost punching area.

A laminated iron core manufacturing apparatus according to a second aspect of the present invention according to the above object is a laminated core manufacturing apparatus for sequentially punching and stacking core pieces from a strip-shaped steel sheet that is intermittently transferred between an upper die and a lower die, The upper die is provided with an absorber containing an adhesive applied in contact with the upper surface of a punching region where the core piece of the strip-shaped steel plate is punched, and the absorber is mounted in a punch for punching the core piece. A bottom protrusion protruding from the lower side of the punch is lowered together with the punch to come into contact with the upper surface of the punching region, and the absorbent stores the adhesive sent from the feeder by pressure . The tanks contained in the punch are connected.

In the laminated core manufacturing apparatus according to the second aspect of the present invention, the absorber is raised with respect to the punch so that the protrusion of the absorber protrudes from below the punch to be accommodated in the punch. It is preferable to further include a lifting means for

According to the method for manufacturing a laminated core according to the first invention and the apparatus for manufacturing a laminated core according to the second invention, an absorbent body containing an adhesive is brought into contact with and bonded to the upper surface or the lower surface of the punching region of the strip steel sheet. Since the agent can be applied, it is possible to suppress variations in the adhesion amount of the adhesive to the strip-shaped steel sheet.

It is explanatory drawing of the manufacturing apparatus of the laminated iron core which concerns on one embodiment of this invention. FIG. 3 is a plan view of a strip-shaped steel plate from which an iron core piece is punched out by the same laminated iron core manufacturing apparatus. It is explanatory drawing which shows the mechanism which applies an adhesive agent to a strip steel plate.

Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
As shown in FIG. 1 and FIG. 3, a laminated core manufacturing apparatus 10 according to an embodiment of the present invention is configured such that an iron core is sequentially transferred from a strip-shaped steel plate W that is intermittently transferred between an upper die 11 and a lower die 12. This is a device for punching and stacking pieces T. The details will be described below.

As shown in FIG. 1, a laminated core manufacturing apparatus 10 includes a roll feeder 13 for intermittently transferring a strip-shaped steel plate W, and a die arranged upstream of the roll feeder 13 along the transportation direction of the strip-shaped steel plate W. Have fourteen.
The mold 14 corresponds to the upper die 11 having the punch holder 15 and the plurality of punches 16 to 19 fixed to the punch holder 15, the stripper plate 20 in which the punches 16 to 19 are inserted, and the punches 16 to 19, respectively. The lower die 12 is provided with a die (not shown).
The strip steel plate W moves intermittently between the upper die 11 and the lower die 12 by repeating a predetermined distance and a primary stop by the operation of the roll feeder 13.

The upper die 11 descends together with the stripper plate 20, and further lowers from the state where the strip steel plate W on which the stripper plate 20 is temporarily stopped is pressed against the lower die 12 and punches the strip steel plate W with the punches 16 to 19. Perform processing.
As shown in FIGS. 1 and 2, the strip steel plate W has a pilot hole H1 formed by punching with a plurality of punches 16, a slot hole H2 formed by punching with a plurality of punches 17, and a punching work by a punch 18. The shaft hole H3 is formed by the punching, and the core piece T shown in FIG. Note that the stripper plate 20 is omitted in FIG.

As shown in FIG. 2, in the strip-shaped steel plate W, the region where the core piece T is punched out is also referred to as “punching region S” below.
As shown in FIG. 3, the punch 19 for punching out the iron core piece T is formed in a tubular shape, and an absorber 21 made of sponge containing an adhesive is attached to the inside thereof. The absorber 21 includes a columnar portion 22 and a base portion 24 that is connected to the lower side of the columnar portion 22 and has a plurality of protrusions 23 formed at the lower end. Each of the protrusions 23 is arranged so as to be located in the punching region S of the strip-shaped steel plate W and in a region where the slot hole H2 and the shaft hole H3 are not formed in plan view.

A tank 27 housed in the punch 19 is connected to the upper side of the cylindrical portion 22 by being connected to an adhesive feeder 25 via a pipe 26. The tank 27 stores the adhesive sent from the feeder 25 by pressurization, and supplies the stored adhesive to the columnar section 22 in accordance with the decrease of the adhesive contained in the columnar section 22. The adhesive contained in the cylindrical portion 22 moves to the base portion 24 as the adhesive contained in the base portion 24 decreases, so that each protrusion 23 always contains a predetermined amount of the adhesive. To

A pair of cams 28 and follower members 29 are provided above the tank 27 in the punch 19. The follower member 29 is fixed to the upper portion of the tank 27, and the absorber 21, the tank 27 and the follower member 29 are urged upward by the elastic members 30 and 31 provided in the punch 19, that is, toward the cam 28. Has been done.
The movement of the cam 28 in the vertical direction is restricted by the punch holder 15, and the cam 28 is not displaced in the vertical direction with respect to the punch 19. To do.

The cam 28 does not mesh with the cam 28 and the follower member 29 due to the operation of the drive source 32, and the center of gravity of the follower member 29 is farthest from the center of gravity of the cam 28. 29 are meshed with each other, and the center of gravity of the follower member 29 horizontally moves between the meshing positions closest to the center of gravity of the cam 28.
When the cam 28 is in the non-meshing position, the absorber 21, the tank 27, and the follower member 29 are arranged at the lowest position with respect to the punch holder 15, and the projections 23 project from below the punch 19. Become.

Then, when the cam 28 is in the meshing position, the absorber 21, the tank 27, and the follower member 29 are arranged at the highest position with respect to the punch holder 15, and the protrusions 23 are housed in the punch 19. The punch 19 is not projected from below.
In this embodiment, the cam 28, the follower member 29, the elastic members 30 and 31, the drive source 32, and the power transmission member 33 mainly constitute the pulling-up means.

When the upper die 11 is lowered to punch the core piece T from the punching region S of the strip steel plate W with the punch 19, the cam 28 is in the non-meshing position, and the absorber 21 has the projections 23 protruding from the lower side of the punch 19. In the state, it descends with the punch 19. In the absorber 21 that has descended together with the punch 19, before the punch 19 punches the core piece T from the strip steel plate W, each protrusion 23 comes into contact with a predetermined position on the upper surface of the punched region S and applies an adhesive. Therefore, each of the protrusions 23, that is, the absorber 21 includes an adhesive agent that is applied in contact with the upper surface of the punched region S.

Immediately after the adhesive is applied to the upper surface of the punching area S, the punch 19 contacts the punching area S and punches the core piece T from the strip steel plate W.
As shown in FIG. 3, the lower die 12 is provided with a laminated portion 34 in which the core pieces T are laminated immediately below the punch 19. The core piece T punched out from the strip-shaped steel plate W and falling is the core piece T punched out from the strip-shaped steel sheet W and laminated in the laminating portion 34 (the iron core piece T laminated in the laminating portion 34). Of the core piece T), which is located at the uppermost position of the above, and the adhesive agent attached to the upper surface of the core piece T punched out immediately before is attached to the lower surface.

When the number of iron core pieces T laminated in the laminating section 34 reaches a predetermined number, a group of the iron core pieces T in which a predetermined number of the iron core pieces T are laminated are taken out from the laminating section 34 and heated to form an adhesive. Is solidified to form a laminated core in which a predetermined number of laminated core pieces T are fixed.
Here, it is necessary not to apply an adhesive to the core piece T laminated (disposed) on the top of the laminated core.

Therefore, the cam 28 is arranged at the meshing position with respect to the punching area S (hereinafter, also referred to as “uppermost punching area S”) in which the core piece T laminated on the top of the laminated iron core is punched (corresponding to). Then, the absorbent body 21 is lowered together with the punch 19 in a state where the protrusion 23 (that is, the lower portion of the absorbent body 21) is accommodated in the punch 19 and is not in contact with the uppermost punching region S. Therefore, the punch 19 can punch the core piece T from the strip-shaped steel plate W without adhering the adhesive agent contained in the protrusion 23 to the punching area S for the uppermost portion.

Next, a method for manufacturing a laminated core according to an embodiment of the present invention to which the apparatus 10 for manufacturing a laminated core is applied will be described.
In the method for manufacturing the laminated core, the core pieces T are sequentially punched out from the strip-shaped steel plates W that are intermittently transferred between the upper die 11 and the lower die 12 to be laminated. The step of applying the adhesive by bringing the plurality of protrusions 23 of the absorber 21 into contact with the upper surface (step A), the step of punching the core piece T from the punching region S by the punch 19 (step B), and the punched core piece T And a step of stacking (step C).

Then, in the present embodiment, the absorber 21 is mounted in the punch 19, descends together with the punch 19, and the plurality of projections 23 (lower portions) protruding downward from the punch 19 are punched out by the core piece T. It comes down from above the punching area S immediately before the punching area S and comes into contact with the upper surface of the punching area S. Further, in the present embodiment, since the protrusions 23 are accommodated in the punch 19 and the absorber 21 descends in the non-contact state with respect to the uppermost punching region S in the punch 19, the laminated body of the laminated core is reduced. No adhesive is applied to the upper surface of the core piece T that is laminated on the top.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and changes in conditions and the like without departing from the gist are all within the scope of application of the present invention.
For example, the absorber may be provided not in the upper mold but in the lower mold, and the adhesive may be applied to the lower surface of the punching region. When the absorber is provided in the lower die, it is preferable to apply an adhesive to the lower surface of the punching region upstream from the position where the core piece is punched from the strip-shaped steel plate in order to simplify the design.
Also, when the absorber is provided in the upper mold and the adhesive is applied to the upper surface of the punched region, the adhesive may be applied to the punched region upstream from the position where the core piece is punched from the strip steel plate.

Then, as the absorber, it is also possible to employ a non-woven fabric or porous rubber or other material instead of the sponge, and further, the absorber may be any one that can apply an adhesive to the punched area, It need not have protrusions.
Further, the lifting means for raising the absorber with respect to the punch is not always necessary, and for example, the adhesive may not be applied to the uppermost punching region by a mechanism that covers the lower part of the absorber at a predetermined timing. .. Further, when adopting the lifting means, the lifting means is not limited to the one using the cam.

10: laminated core manufacturing apparatus, 11: upper mold, 12: lower mold, 13: roll feeder, 14: mold, 15: punch holder, 16 to 19: punch, 20: stripper plate, 21: absorber, 22 : Cylindrical part, 23: Protrusion, 24: Base part, 25: Feeder, 26: Pipe, 27: Tank, 28: Cam, 29: Follower member, 30, 31: Elastic member, 32: Drive source, 33 : Power transmission member, 34: laminated portion, W: strip steel plate, T: iron core piece, H1: pilot hole, H2: slot hole, H3: shaft hole, S: punching region

Claims (4)

From a strip-shaped steel sheet that is intermittently transferred between the upper die and the lower die, in a method for manufacturing a laminated core in which iron core pieces are punched and laminated,
A step A of applying the adhesive by bringing a protrusion at a lower end of an absorbent containing an adhesive into contact with an upper surface of a punching region where the core piece of the strip-shaped steel plate is punched;
A step B of punching the core piece from the punching region with a punch provided in the upper die;
And a step C of stacking the punched iron core pieces,
The absorber is mounted in the punch, descends together with the punch, and the projection in a state of protruding downward from the punch contacts the upper surface of the punching region immediately before the core piece is punched,
A method for manufacturing a laminated core , wherein a tank , which stores the adhesive sent from a feeder by pressure, is connected to the absorber and is accommodated in the punch . 2. The method of manufacturing a laminated core according to claim 1 , wherein the protrusion of the absorber is accommodated in the punch with respect to the uppermost punching region where the core piece laminated on the uppermost of the laminated core is punched. A method for manufacturing a laminated core, characterized by descending in a non-contact state with a punching region for topmost. In a laminated iron core manufacturing apparatus for sequentially punching and stacking core pieces from a strip-shaped steel sheet that is intermittently transferred between an upper die and a lower die,
The upper die is provided with an absorber containing an adhesive applied in contact with the upper surface of a punching region where the core piece of the strip-shaped steel plate is punched, and the absorber is mounted in a punch for punching the core piece. , The lower end projection protruding from the lower side of the punch is lowered together with the punch to come into contact with the upper surface of the punching area, and the absorbent stores the adhesive fed by pressure from a feeder . A manufacturing apparatus for a laminated core, wherein tanks accommodated in the punches are connected to each other. 4. The laminated iron core manufacturing apparatus according to claim 3 , wherein the absorber is lifted with respect to the punch so that the protrusion of the absorber protrudes from below the punch and is accommodated in the punch. An apparatus for manufacturing a laminated core, further comprising pulling means.

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