JP4252677B2 - Manufacturing method of laminate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a laminated body in which laminated sheets such as a laminated core of a motor or a transformer are manufactured by sequentially laminating a single sheet punched from a strip-shaped thin plate into a desired shape and joining the laminated sheets.
[0002]
[Prior art]
The laminated cores of motors and transformers are punched out from the strips by punching out the core-shaped core single plate with an external punch after the die-cutting process is performed for each pressing process while intermittently transporting the strips as the core material. Manufactured by sequentially fitting and stacking in a die. The laminated iron cores need to be joined to form a block between the laminated iron core plates, and there are a method of joining in a die and a method of joining after taking out from the die.
[0003]
As a mechanical method of joining the laminated core single plates accumulated in the die, caulking is performed by a protrusion as disclosed in Japanese Patent Laid-Open Nos. 49-37103 and 58-116033. The method is known. In these methods, before cutting out the outer shape, cut and raised protrusions (dowels) are formed on the core single plate, and the single plates are caulked together when the core single plates are laminated by the cut and raised protrusions. It is what I did. In addition, a method of joining the laminated layers by laser welding is also known.
[0004]
Japanese Patent Laid-Open No. 5-304037 discloses a method of joining laminated core sheets by bonding. This joining method is of a type that is cured by mixing a two-component adhesive, for example, an epoxy resin and a curing agent, and is a plate material in which one of the two components is punched on the upper surface of the laminated iron core plate. When the iron core single plate which has been applied to the lower surface and punched out is superposed on the iron core single plate previously laminated, the single plates are joined by mixing two liquids.
[0005]
[Problems to be solved by the invention]
However, when a mechanical joining method is used, the laminated iron core plates are also electrically joined, so that when used as an iron core, eddy current loss increases, and by using a laminated iron core, eddy current loss is reduced. There was a problem that the effect of lowering decreased.
[0006]
Further, in the joining method using the two-component adhesive, the adhesive layer is formed in two layers (in the above example, an epoxy resin and a hardener layer) between the laminated iron core single plates, and the space factor of the laminated iron core There was a problem of lowering. In addition, the two-component adhesive needs to mix the two components sufficiently, but the upper and lower iron core single plates are overlapped so that the two components only come into contact with each other and sufficient adhesive strength cannot be obtained. There was also a problem that peeling was likely to occur.
[0007]
An object of the present invention is to provide a method for manufacturing a laminated body in which the laminated plate materials are bonded together without lowering the space factor.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is to intermittently transfer a strip-shaped thin plate between a punch and a die, punch a single plate of a laminated body continuously from the strip-shaped thin plate by the punch, and insert the single plate into the die. In the manufacturing method of a laminated body in which each single plate is joined between the layers to form a block, the die at the punching position is moved before the punching position of the single plate of the strip-shaped thin plate moves onto the die. A method of manufacturing a laminate in which a cyanoacrylate adhesive is applied to a side surface from a nozzle and immediately moved onto a die and punched, and when the laminate is manufactured, the nozzle faces the discharge port upward and a state at the time of manufacture stop of the laminate, the adhesive supplying adhesive the discharge port Rutotomoni toward the nozzle upward horizontally switching 90 degrees, to the nozzle over the discharge port to discharge port cap Serving And wherein to Rukoto the supply pressure to the negative pressure from the means.
[0009]
According to this manufacturing method, after applying a low-viscosity adhesive material to a position where a single plate of a laminate is punched from a strip-shaped thin plate, and punching this, the punched single plate is punched first and laminated. It is pressed on the plate. At this time, since the cyanoacrylate adhesive has a low viscosity, it is diffused between the layers by being pressed, and the lamination of the single plates is joined by a thin layer of adhesive. Low-viscosity adhesives have high diffusibility, and the adhesive layer is thin, so there is less wasted space between the laminates, and the space factor is reduced due to the presence of something other than a single plate in the laminate. Is suppressed.
[0010]
The present invention uses a cyanoacrylate adhesive, the area is increased to touch with air by diffusion faster curing rate, it is taken out in a state of being joined by press working machine as laminated core by rapid curing it can.
[0011]
Further, by stopping the application of the adhesive every predetermined number of single plates, it is possible to join and block each predetermined number of sheets, which is suitable for mass production of laminated iron cores such as motors and transformers.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0013]
FIG. 1 shows a configuration of a main part of a laminated iron core manufacturing apparatus to which a laminated body manufacturing method according to the present embodiment is applied. A punch block 1 and a die block 2 that constitute a press machine, and an adhesive application unit. 3.
[0014]
The punch block 1 supports a punch 4 that is driven to move up and down by an advancing / retreating drive unit (not shown), and slidably moves the punch block 1. 3 and a pressing block 12 that is pressed onto the die 5.
[0015]
The die block 2 includes a die 5 disposed opposite to the punch 4 and a laminated holding block 8 in which a laminated hole 8a communicating with a punched hole 5a formed in the die 5 is formed. Yes.
[0016]
In addition, the adhesive application part 3 is provided with a nozzle 9 so that the discharge port is positioned substantially flush with the upper surface of the die 5, and a tube 13 is connected to the nozzle 9, and an adhesive (not shown) The cyanoacrylate adhesive is supplied from the supply means at a predetermined supply pressure. This adhesive application part 3 is disposed at a position close to the die 5 on the upstream side in the transport direction of the strip-shaped thin plate 11 which is a material for forming the laminated core with respect to the position where the die 5 is disposed.
[0017]
Between the punch 4 and the die 5 of the laminated core manufacturing apparatus configured as described above, the strip-like thin plate 11 is intermittently transferred at the punching interval d of the core single plate 6 by an intermittent transfer means (not shown). The advance operation of the punch block 1 and the discharge operation of the adhesive from the nozzle 9 of the adhesive application unit 3 are controlled to synchronize with the timing of stopping by the intermittent transfer of the strip-shaped thin plate 11. When the punch block 1 moves forward to the die 5 side, the belt-like thin plate 11 is pressed onto the die 5 and abuts on the adhesive application part 3. At this time, on the die 5, the punch 4 descends simultaneously with the pressing of the strip-shaped thin plate 11 against the die 5 and punches the core single plate 6 from the strip-shaped thin plate 11, and the core single plate is inserted into the punched hole 5 a formed in the die 5. 6 is inserted. On the adhesive application part 3, the adhesive 7 is discharged from the nozzle 9, and the adhesive 7 is applied to the lower surface of the strip-like thin plate 11 in a dot shape.
[0018]
As shown in FIG. 1, the adhesive application position of the strip-like thin plate 11 coated with the adhesive 7 at the punching interval d is intermittently transferred at the punching interval d and moved onto the die 5, and the iron core is moved by the punch 4 and the die 5. The veneer 6 is punched out. The iron core single plate 6 is pushed into the punched hole 5a of the die 5 by the punch 4 to the insertion position which becomes the bottom dead center of the punch 4, and stops at the inserted position by friction with the punched hole 5a. When the core single plate 6 is punched one after another and pushed into the punched hole 5a, the core single plate 6 at the fitting position in the punched hole 5a is pushed out first and pushed downward, so that the iron core is placed in the punched hole 5a. When the single plates 6 are laminated and the number of laminations increases, a laminated iron core 10 is formed which continues from the punched holes 5a to the laminated holes 8a of the laminated holding block 8. Since the adhesive 7 is applied to the lower surface of the punched core single plate 6, when the punch 7 is first punched and pressed into the core single plate 6 in the insertion position, the adhesive 7 is not laminated between the core single plates 6. Are diffused to join between the iron core single plates 6. When the adhesive 7 is a cyanoacrylate-based adhesive, an adhesive layer is formed in a thin film of about 0.01 mm and is quickly cured to perform adhesive bonding.
[0019]
Since cyanoacrylate adhesive polymerizes and cures with moisture in the air, the thinner the adhesive layer, the greater the contact area with the air and the faster the curing, and the thinner the adhesive layer is The space factor of the iron core 10 can be increased. Adhesive 7 has a low viscosity, and when the pressure contact with the core single plate 6 in the insertion position is increased, the diffusibility of the adhesive 7 increases, and the thinner adhesive layer has a wider area. Rapid joining is possible, and the space factor can be increased. The pressure contact force increases when the frictional force with the punched hole 5a of the die 5 of the punched iron core single plate 6 is increased, so that the joining time is shortened by appropriately selecting the frictional force and the type of adhesive. As a result, no deficiency in joining occurs during the movement of the plate material in the die 5 and the laminated holding block 8.
[0020]
When the application of the adhesive by the adhesive application unit 3 is stopped every time the preset number of laminated iron core plates 6 is finished, the iron core plates 6 laminated in the laminated holding block 8 are The iron core single plate 6 having a predetermined number of laminations becomes a laminated iron core 10 that is blocked. When the laminated core 10 is pushed out from the lower open portion of the laminated hole 8 a of the laminated holding block 8, it can be taken out as a joined laminated core 10.
[0021]
When the cyanoacrylate adhesive is used as the adhesive 7 as described above, it cures by being polymerized with moisture in the air, so that it is necessary to prevent curing at the discharge port of the nozzle 9. Since the curing of the cyanoacrylate adhesive is delayed when the area in contact with air is small, the adhesive is not cured at the discharge port of the nozzle 9 when the adhesive 7 is continuously applied by the adhesive application unit 3. . However, since the curing proceeds when the production is stopped, in order to prevent this, when the production is stopped, the supply pressure from the adhesive supply means connected to the tube 13 is slightly switched to the negative pressure direction to remove the adhesive 7 in the nozzle 9. While slightly returning to the tube 13 side, the discharge port is blocked from the outside air. FIG. 2 shows a structure for preventing the adhesive 7 from being cured when the production is stopped.
[0022]
In FIG. 2, the nozzle 9 is mounted on a conversion mechanism 15 that switches the direction of the discharge port to a 90-degree direction, and is fixed with the discharge port facing upward as shown in FIG. When the strip-shaped thin plate 11 is pushed down by the lowering of the block 1 (see FIG. 1), the adhesive 7 supplied from the tube 13 at a predetermined supply pressure is discharged from the discharge port and applied to the lower surface of the strip-shaped thin plate 11 in a dotted manner. To do.
[0023]
When the production of the laminated core 10 is stopped, as shown in FIG. 2B, the nozzle 9 is switched in the horizontal direction by the conversion mechanism 15 and the discharge port cap 16 is put on the discharge port to block the discharge port from the outside air. To do. Since the discharge port cap 16 is connected to the cylinder 17 and presses the discharge port cap 16 to the discharge port with an appropriate cushioning property, the discharge port is blocked from outside air and at the same time, the discharge port is prevented from being damaged.
[0024]
【The invention's effect】
As described above, according to the present invention, since the veneer punched from the plate material coated with the low-viscosity adhesive is pressed onto the veneer previously punched by the punching pressure, the low-viscosity adhesive has a pressure contact force. And bonded between the laminates by a thin adhesive layer. Therefore, a laminated body with a high space factor can be manufactured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a main configuration of a laminated iron core manufacturing apparatus to which a laminated body manufacturing method is applied.
FIGS. 2A and 2B are side views showing the structure for preventing the adhesive from being hardened when production is stopped, and FIG.
[Explanation of symbols]
4 Punch 5 Die 5a Punching hole 6 Core single plate 7 Adhesive 10 Laminated core 11 Strip-shaped thin plate

Claims (2)

The strip-like thin plate is intermittently transferred between the punch and the die, and the single plate of the laminated body is punched out continuously from the strip-like thin plate by the punch, and this single plate is inserted into the die and laminated, and each single plate is laminated between the laminates. In the manufacturing method of the laminate that is joined and blocked by
Before the punching position of the single sheet of the strip-shaped thin plate moves onto the die, a cyanoacrylate-based adhesive is applied from the nozzle to the die-side surface at the punching position, and immediately moved onto the die to perform punching processing. A method of manufacturing a laminate,
During the production of the laminate, said nozzle and being directed to the discharge port upward, at the time of manufacture stopping laminate Rutotomoni toward the nozzle toward the discharge port upward horizontally switching 90 degrees, the discharge cap method for producing a laminate according to claim to Rukoto the supply pressure to the negative pressure from the adhesive supply means for supplying glue to said nozzles over the delivery outlet.   The manufacturing method of the laminated body of Claim 1 which stops application | coating of an adhesive agent for every predetermined number of sheets.

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