JP2023018697A - Motor core manufacturing method and motor core manufacturing device - Google Patents

Abstract

To provide a motor core manufacturing device capable of bonding cores to each other in addition to adhering and fixing magnets without wasting an adhesive in motor core manufacturing work.SOLUTION: When a downward force is applied to a core 42 in FIG. (a), an adhesive 15B further spreads. As shown in FIG. (b), a partial adhesive 15C1 protrudes from the core 42, hits a magnet 51, and flows up and down. Although not shown, the adhesive also flows down from the top of the upper core 42, so after hitting the magnet 51, the adhesive flows up and down by half the thickness of the core 42. The surplus part goes around to other surfaces of the magnet 51 (front and back surfaces in the figure). As a result, the partial adhesive 15C1 fills a gap between a magnet hole 44 and the magnet 51, and a remaining adhesive 15C2 remains between the core 42 and the core 42, as shown in FIG. (c).SELECTED DRAWING: Figure 11

Description

The present invention relates to motor core manufacturing technology.
In the following description, a sheet of thin steel plate provided with a magnet hole is referred to as a "core", and a stack of a predetermined number of such cores is referred to as a "laminated core." This is called a "motor core".

A motor core manufacturing apparatus that obtains a motor core by inserting a magnet into a laminated core and bonding and fixing the magnet to the laminated core has been widely put into practical use (see, for example, Patent Document 1 (FIG. 1)).

Patent Document 1 will be described with reference to FIGS. 13 and 14. FIG.
FIG. 13 is a perspective view of a conventional two-component adhesive applicator. The two-component adhesive applicator 100 includes a main agent nozzle 102 for discharging a main agent 101 and a curing agent nozzle 104 for discharging a curing agent 103. ing.

As adhesives, two-component adhesives and one-component adhesives are put into practical use.
A two-component adhesive obtains adhesive strength by reacting the main agent and the curing agent.
On the other hand, one-liquid type adhesives are generally hardened by heating after application to obtain a predetermined adhesive strength.

By the way, when a one-liquid type adhesive is used for surface bonding of a large area, it is difficult for the solvent and moisture to escape from the central portion, which is difficult to come into contact with the outside air. If it does not come off, the desired adhesive strength cannot be obtained.
In this respect, the two-pack type adhesive generally cures at room temperature to obtain a predetermined adhesive strength. That is, when the curing agent 103 is mixed with the main agent 101, a curing reaction (chemical reaction) by the curing agent 103 proceeds. Therefore, two-component adhesives are suitable for structures where it is difficult for solvents and moisture to escape from recessed areas.

As shown in FIG. 14( a ), a laminated core 108 is placed on a base 106 by laminating a predetermined number of cores 107 . The main agent nozzle 102 is inserted into the magnet hole 109 to apply the main agent 101 .
As shown in FIG. 14B, the curing agent nozzle 104 is inserted into the magnet hole 109 and the curing agent 103 is applied. When the curing agent 103 is mixed with the main agent 101, the curing reaction progresses from this moment.

The magnet 111 is inserted into the magnet hole 109 as shown in FIG. 14(c). This insertion causes some of the admixture 112 to overflow. Patent document 1 is characterized in that part of the mixture 112 is overflowed. After a predetermined period of time, the mixture 112 and the overflow portion 113 are cured.
The overflow portion 113 is removed because it is unnecessary.

Patent Literature 1 described above has the following problems.
First, if the insertion timing of the magnet 111 is delayed, the mixed agent 112 becomes hard and the insertion of the magnet 111 becomes difficult. It is necessary to complete the insertion of the magnet 111 within a predetermined time from the application of the curing agent 103 . Due to the lack of time, the work of manufacturing the motor core becomes difficult.

Second, the mixture 112 is wasted, as typified by the overflow portion 113 .
Thirdly, the protruding portions of the adhesive (such as the overflow portion 113) are removed by wiping or cutting. This removal work is complicated.

Fourthly, Patent Literature 1 does not mention bonding between a core 107 and an adjacent core 107 (although adhesively fixing the magnet 111 to the laminated core 108 is disclosed). In order to improve the quality of the motor core, it is desirable to bond the cores 107 together in addition to fixing the magnets 111 .

Fifthly, in Patent Document 1, the description starts with the core 107, and the core 107 is generally obtained by punching out a strip-shaped thin steel plate with a punching device. The punching device and the two-liquid adhesive application device 100 need to be installed separately, increasing the installation area (floor area) of the device. Consolidation of facilities is desired.

JP 2011-172347 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor core manufacturing technique that allows time to spare in motor core manufacturing work, eliminates the wasteful use of adhesive, and enables bonding between cores in addition to adhesion and fixation of magnets. do.

In the invention according to claim 1, a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated cores, and the magnets are adhered with an adhesive. A motor core manufacturing method for obtaining a motor core fixed to a laminated core, comprising:
an adhesive application step of applying a one-liquid adhesive in the form of dots to predetermined locations of the core by an adhesive application mechanism;
A pressurizing mechanism applies an axial force to the laminated core coated with the adhesive to spread it, and part of the adhesive is interposed in the gap between the magnet and the magnet hole, and the remaining part is interposed between the adjacent cores. A pressurization step interposed in
and a heating step of heating the laminated core by a heating mechanism to cure the adhesive.

In the invention according to claim 2, a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated cores, and the magnets are bonded with an adhesive. A motor core manufacturing method for obtaining a motor core fixed to a laminated core, comprising:
an adhesive application step of applying a one-liquid adhesive in the form of dots to predetermined locations of the core by an adhesive application mechanism;
A pressurizing mechanism applies an axial force to the laminated core coated with the adhesive to spread it, and part of the adhesive is interposed in the gap between the magnet and the magnet hole, and the remaining part is spread between the adjacent cores. and a pressurizing step of interposing the adhesive in the adhesive and hardening the adhesive by pressurization.

In the invention according to claim 3, a predetermined number of cores made of thin steel plates and provided with magnet holes into which magnets are inserted are laminated, the magnets are inserted into the obtained laminated cores, and the magnets are bonded with an adhesive. A motor core manufacturing apparatus for obtaining a motor core fixed to a laminated core,
This motor core manufacturing equipment
an adhesive application mechanism for applying a one-liquid adhesive in the form of dots to predetermined locations of the core;
Applying an axial force to the laminated core coated with the adhesive to spread it, and pressurizing to interpose a part of the adhesive in the gap between the magnet and the magnet hole and interpose the remaining part between the adjacent cores. a mechanism;
and a heating mechanism for heating the laminated core to cure the adhesive.

In the invention according to claim 4, a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated cores, and the magnets are bonded with an adhesive. A motor core manufacturing apparatus for obtaining a motor core fixed to a laminated core,
This motor core manufacturing equipment
an adhesive application mechanism for applying a one-liquid adhesive in the form of dots to predetermined locations of the core;
Axial force is applied to the laminated core coated with the adhesive to spread it, so that a part of the adhesive is interposed in the gap between the magnet and the magnet hole while the remaining part is interposed between the adjacent cores and applied. and a pressure mechanism for curing the adhesive by pressure.

The invention according to claim 5 is the motor core manufacturing apparatus according to claim 3 or claim 4,
The adhesive application mechanism is installed in a punching device for obtaining the core by punching a strip-shaped thin steel plate, and the application process is synchronized with the punching process.

In the invention according to claim 1, the dot-like adhesive is spread. Even after spreading, the area of the adhesive is not so large, evaporation of the central portion can be expected, and the desired adhesive strength can be secured. Therefore, in the present invention, it was decided to use a one-liquid type adhesive.

A one-liquid type adhesive does not harden at room temperature, giving you more time to work.
Also, since the adhesive is applied in the form of dots, it does not protrude even if it is spread out. All of the adhesive can be used for bonding if there is no protrusion.
In addition, with the spread adhesive, the cores can be bonded together and the magnet can be bonded and fixed at the same time.
Therefore, according to the present invention, there is provided a method for manufacturing a motor core that allows time to spare in motor core manufacturing work, eliminates wasteful use of adhesive, and enables bonding between cores in addition to adhesion and fixation of magnets. be.

In the invention according to claim 2, the same effects as in claim 1 are exhibited.
In addition, claim 1 requires a heating step, but claim 2 does not require a heating step.
As a result, claim 2 requires fewer manufacturing steps than claim 1.

In the invention according to claim 3, the point-like adhesive is spread. Even after spreading, the area of the adhesive is not so large, evaporation of the central portion can be expected, and the desired adhesive strength can be secured. Therefore, in the present invention, it was decided to use a one-liquid type adhesive.

A one-liquid type adhesive does not harden at room temperature, giving you more time to work.
Also, since the adhesive is applied in the form of dots, it does not protrude even if it is spread out. All of the adhesive can be used for bonding if there is no protrusion.
In addition, with the spread adhesive, the cores can be bonded together and the magnet can be bonded and fixed at the same time.
Therefore, according to the present invention, there is provided an apparatus for manufacturing a motor core, which has a margin of time in the manufacturing work of the motor core, does not waste the adhesive, and is capable of adhering and fixing the magnets and joining the cores to each other. be.

In the invention according to claim 4, the same effects as in claim 3 are exhibited.
In addition, although claim 3 requires a heating mechanism, claim 4 does not require a heating mechanism.
As a result, according to claim 4, the motor core manufacturing apparatus is smaller than according to claim 3.

In the invention according to claim 5, the adhesive application mechanism is installed in the punching device. The equipment can be integrated, and the installation area (floor area) of the equipment can be reduced.

1 is a configuration diagram of a motor core manufacturing apparatus according to the present invention; FIG. 1 is a principle diagram of a punching device incorporating an adhesive application mechanism; FIG. (a) is a view taken along line 3a-3a in FIG. 2, and (b) is a view taken along line 3b-3b in FIG. FIG. 4 is a view taken along line 4-4 in FIG. 2; 5 is a view in the direction of arrow 5 of FIG. 2; FIG. It is a principle diagram of a magnet insertion machine. 1 is a principle diagram of a pressurizing mechanism provided with a heating mechanism; FIG. It is a figure explaining the change of the shape of an adhesive agent. 4 is a graph showing the correlation between surface pressure P and diameter df. It is a figure explaining the change of the shape of a dot-like adhesive. It is a figure explaining the change of the shape of a dot-like adhesive. It is a figure explaining the position of an application point. 1 is a perspective view of a conventional two-component adhesive application device; FIG. FIG. 2 is a functional diagram of a conventional two-liquid type adhesive application device;

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the motor core manufacturing apparatus 10 includes an adhesive application mechanism 11, a punching device 20, a magnet inserter 50, a pressure mechanism 55, and a heating mechanism 60. As shown in FIG. The configurations and actions of these mechanisms or devices will be described in detail below.

As shown in FIG. 2, the punching device 20 incorporates an adhesive application mechanism 11 .
The punching device 20 includes a base 21, a lower die 22 placed on the base 21, an upper die 23 arranged above the lower die 22, and a press plate 24 supporting the upper die 23. and a press cylinder 25 for elevating the press plate 24 and pressing the upper die 23 against the strip-shaped thin steel plate 41 placed on the lower die 22 .

The thickness of the strip-shaped thin steel plate 41 is, for example, 0.2 to 0.5 mm.
Although illustration is omitted for the sake of easy understanding, the strip-shaped thin steel plate 41 is arranged avoiding the dot-like adhesive so as not to come into contact with the upper surface of the lower mold 22 when the material is moved. support it with a pin and push it up. A plate-shaped member may be used to support the device to push it up more securely. In this case, the upper surface of the plate-like member is provided with a strip-like concave groove to avoid contact with the dot-like adhesive.

An inner peripheral punch 26 , a plurality of magnet hole punches 27 surrounding the inner peripheral punch 26 , and an outer peripheral punch 28 are installed on the lower surface of the upper die 23 .

The lower die 22 is provided with scrap discharge holes 31 and 32 below the inner peripheral punch 26 and below the magnet hole punch 27 .
A scrap conveyor 33 is arranged under the scrap discharge holes 31, 32, and scraps 34, 35 generated in the punching process fall through the scrap discharge holes 31, 32 and are discharged out of the apparatus by the scrap conveyor 33. .

A piling (stacking) plate 36 is fitted under the outer peripheral punch 28 in the lower mold 22 so as to be movable up and down. The piling plate 36 is supported by a servo cylinder 37 . The servo cylinder 37 is a device capable of precise position control.
The core 42 punched by the descending outer peripheral punch 28 drops and rests on the piling plate 36. - 特許庁When a plurality of cores 42 are placed, the piling plate 36 is gradually lowered so that the highest core 42 has a constant height.

After a predetermined number of cores 42 are laminated, the laminated core 43 is lowered to the position indicated by the imaginary line, pushed by the pusher 38, transferred to the conveyor 39, and conveyed by the conveyor 39 to the next process.

The adhesive application mechanism 11 comprises, for example, a cylindrical application gun 12 and a gun elevating cylinder 13 for elevating the application gun 12 .

In this embodiment, the adhesive is applied to the lower surface of the strip-shaped thin steel plate 41 . Therefore, for the lowest (first) core 42, the coating gun 12 is lowered to the position of the imaginary line. Only the lowest core 42, that is, the first core 42 is left unpainted. This treatment prevents the first core 42 from sticking to the piling plate 36 .
For the second and subsequent cores 42, the coating gun 12 is returned to the position indicated by the solid line, and the lower surface is coated.

The strip-shaped thin steel plate 41 moves from the coating gun 12 to the peripheral punch 28 (from left to right in the drawing). That is, the coating gun 12, the inner peripheral punch 26, and the outer peripheral punch 28 are arranged along this moving direction.
When the distance between the center of the application gun 12 and the center of the inner peripheral punch 26 is D1 and the distance between the center of the inner peripheral punch 26 and the center of the outer peripheral punch 28 is D2, the distance D1 and the distance D2 are made equal. .

The movement of the strip-shaped thin steel plate 41 is stopped and the upper die 23 is lowered. Then, the adhesive is applied by the application gun 12 to the lower surface of the portion where the strip-shaped thin steel plate 41 is present. The upper mold 23 is raised.

Next, the strip-shaped thin steel plate 41 is moved by a distance D1. The movement of the strip-shaped thin steel plate 41 is stopped and the upper die 23 is lowered. A center hole and a magnet hole are formed by punching in a portion of the strip-shaped thin steel plate 41 . At this time, the adhesive is synchronously applied to the next part of the "certain part". The upper mold 23 is raised.

Next, the strip-shaped thin steel plate 41 is moved by a distance D2 (same as D1). The movement of the strip-shaped thin steel plate 41 is stopped and the upper die 23 is lowered. A core 42 is punched out at a certain portion of the strip-shaped thin steel plate 41 and falls onto the piling plate 36 . At this time, a central hole and a magnet hole are synchronously punched in the next part of the "certain part", and the adhesive is applied to the next part of the "next part". The upper mold 23 is raised.

The view along arrow 3a-3a in FIG. 2 will be explained with reference to FIG. 3(a), and the view along arrow 3b-3b in FIG. 2 will be explained with reference to FIG. 3(b).
As shown in FIG. 3(a), the strip-shaped thin steel plate 41 remains as a coil material, but magnet holes 44 shown by imaginary lines later are punched out.

As shown in FIG. 3B, a plurality of ejection holes 14 are arranged on the upper surface of the coating gun 12 . In this example, the plurality of discharge holes 14 are provided corresponding to the magnet holes 44 shown in FIG. 3(a).
A one-liquid type adhesive 15 is supplied to the application gun 12, and a predetermined amount of adhesive is discharged from the discharge hole 14, although the intermediate flow path is omitted.

The 4-4 arrow view in FIG. 2 will be explained with FIG. 4, and the 5 arrow view will be explained with FIG.
As shown in FIG. 4, a strip-shaped thin steel plate 41 is coated with dot-like adhesive 15A (although it is a one-liquid type adhesive 15, English letters are added to clarify the difference in shape; the same applies hereinafter). In addition, magnet hole 44 and center hole 45 are stamped and formed.

As shown in FIG. 5, the perforated disk-shaped core 42 was obtained by punching the outer periphery. On the lower surface of the core 42, one adhesive 15A per hole is applied around the magnet holes 44 and near the center.

The cores 42 are stacked and transported by the conveyor 39 described in FIG. A magnet 51 shown in FIG. 6 is inserted into the laminated core 43 carried. The magnet 51 is a single or multiple rod-shaped permanent magnets.

As shown in FIG. 6, the magnet inserter 50 is a robot hand 52, for example.
A robot hand 52 inserts the magnet 51 into the magnet hole 44 of the laminated core 43 placed on the set table 53 . Note that the magnet inserter 50 is not limited to the robot hand 52 .
The magnet 51 is not adhered to the laminated core 43 at this point of insertion.

If adhesive exists in the magnet holes 44, it may become difficult to insert the magnets 51. FIG.
In this embodiment, since there is no adhesive in the magnet hole 44, insertion of the magnet 51 is facilitated. Reinsertion of the magnet 51 is also possible. Therefore, there is enough time to insert the magnet 51 .

The laminated core 43 with the magnet 51 inserted is transferred to the pressure mechanism 55 .
As shown in FIG. 7, the pressurizing mechanism 55 consists of a press table 56 and a press platen 57 .
The laminated core 43 is placed on a press table 56 and an axial force is applied from above by a press table 57 .
The pressurizing action by the axial force at this time will be described in detail.

FIG. 8 is a diagram for explaining changes in the shape of the adhesive.
As shown in FIG. 8A, the lower surface of the core 42 is coated with adhesive 15A in dots. The dot-like adhesive 15A has a substantially hemispherical shape and an outer diameter of d0.
As shown in FIG. 8(b), while being pressed by the press platen 57 of FIG. spread. Increase the pressure.
As shown in FIG. 8(c), when a predetermined pressure F is reached, the adhesive 15C becomes a very thin film. Let df be the diameter after expansion.

FIG. 9 is a graph showing the correlation between the surface pressure P and the diameter df, where the horizontal axis represents the surface pressure P and the vertical axis represents the diameter df after expansion. The surface pressure P is defined by P=(applied pressure F/outer diameter d0 of the point adhesive).
If the outer diameter d0 is constant, the surface pressure P increases as the applied force F increases. As the surface pressure P increases, the adhesive spreads, and the diameter df after spreading increases. However, the thinner the adhesive, the more difficult it is to apply pressure, so the curve becomes flat.

Next, the relationship between the magnet 51 and the adhesive described with reference to FIG. 8 will be described with reference to FIGS. 10 and 11. FIG.
As shown in FIG. 10(a), dots of adhesive 15A are applied in the vicinity of the magnet hole 44 and at the width center (approximately including the width center) of the magnet hole 44. As shown in FIG. For the sake of clarity, the dot-like adhesive 15A applied to the lower surface is shown on the front side. From this state, the dots of adhesive 15A are spread out.
As shown in FIG. 10B, the edge of the spread adhesive 15B reaches the edge of the magnet hole 44. As shown in FIG.

In FIG. 10(c), when there is no magnet hole 44, the expanded adhesive 15C partially covers the magnet hole 44 indicated by the imaginary line. When expanded to the expanded diameter df, for example, a 1/4 df height cutout circle portion (arcuate portion) covers the magnet hole 44 and a 3/4 df height portion remains on the core 42 .

FIG. 11(a) shows a cross-sectional view taken along the line 11a-11a of FIG. 10(b).
When a downward force is applied to the core 42 in FIG. 11(a), the adhesive 15B spreads further.

As shown in FIG. 11(b), a portion of the adhesive 15C1 protrudes from the core 42, strikes the magnet 51, and flows upward and downward. Although not shown in the figure, the adhesive also flows down from the top of the upper core 42 , so after hitting the magnet 51 , it flows up and down by a distance of half the thickness of the core 42 . The thickness of the core 42 is approximately 0.2 to 0.5 mm. A half of the thickness of the core 42 is 0.1 to 0.25 mm, and this thickness allows the adhesive to flow up and down easily. Furthermore, the surplus of the adhesive wraps around the other surfaces of the magnet 51 (front and back surfaces in the drawing).

As a result, part of the adhesive 15C1 fills the gap between the magnet hole 44 and the magnet 51, and the remaining adhesive 15C2 remains between the cores 42, as shown in FIG. 11(c).

With the diameter df after expansion shown in FIG. 10(c), the distribution of the adhesive 15C1 and the adhesive 15C2 shown in FIG. Assume that the joint strength between satisfies the required specifications.

The pressing force F is obtained by applying the diameter df after expansion at this time to FIG. Based on this pressing force F, the pressing force of the press platen 57 shown in FIG. 7 is controlled. As a result, the forms of the adhesive 15C1 and the remaining adhesive 15C2 shown in FIGS. 11(b) and 11(c) can be reproduced.

In the laminated core 43 shown in FIG. 7, part of the adhesive fills the gap between the magnet hole and the magnet, and the remaining adhesive remains between the cores 42 .
What is important here is that the adhesive is a one-liquid type adhesive that does not harden when applied at room temperature but hardens when heated. After application by the adhesive application mechanism 11 shown in FIG. 1, punching by the punching device 20, insertion of magnets by the magnet insertion machine 50, and pressure by the pressure mechanism 55, the adhesive does not harden, so the work is hasty. You don't have to, and you don't have to strictly control your work. As a result, a motor core manufacturing apparatus (Fig. 1, reference numeral 10) is provided that has a margin of time in the motor core manufacturing work.

A heating mechanism 60 is attached to the pressurizing mechanism 55 shown in FIG. The heating mechanism 60 is an induction heating coil 61, for example. The laminated coil 43 is heated by energizing the induction heating coil 61 . The heating temperature is the temperature at which the one-component adhesive 15 is cured.
By heating, the one-liquid type adhesive 15 is cured and the desired motor core 63 is obtained.

Although the one-liquid adhesive that cures by heating has been described so far, any adhesive that does not cure when applied can be used in the present invention. For example, a pressure-sensitive adhesive may be used in which the main agent and the curing agent are reacted by applying pressure after application.
In this case, the heating mechanism 60 becomes unnecessary, and the adhesive can be cured only by the pressure mechanism 55 . That is, in FIG. 1 , the motor core manufacturing apparatus 10 is composed of an adhesive application mechanism 11 , a punching device 20 , a magnet inserter 50 and a pressure mechanism 55 .

The application position of the dot-like adhesive 15A will be explained based on FIG.
As shown in FIG. 12(a), by bringing the application point 65, which is the center point of the adhesive 15C, closer to the magnet hole 44, the proportion of the adhesive 15C1 can be partially increased.

Conversely, as shown in FIG. 12(b), if the application point 65 is made farther from the magnet hole 44, the proportion of a portion of the adhesive 15C1 can be reduced.
Alternatively, as shown in FIG. 12C, a plurality of (two in this example) application points 65 may be set for each magnet hole 44 . By providing a plurality of application points 65, a sufficient amount of the adhesive 15C1 can be applied to the gap between the magnet hole 44 and the magnet 51. FIG.

The position and number of the application points 65 may be determined in consideration of the characteristics of the one-component adhesive 15, the thickness of the core 42, the size of the magnet hole 44, the gap between the magnet hole 44 and the magnet 51, and the like.
That is, in the present invention, since the adhesive 15 is applied not on the surface but on points, by controlling the positions and number of the application points 65, it is possible to control the adhesion and fixation of the magnet 51 and the adhesion and fixation of the cores 42 to each other. .

Also, as shown in 11(c), the spread adhesive 15C stays between the cores 42 and around the magnets 51 and does not protrude from the cores 42. FIG. As a result, wasteful use of the one-component adhesive 15 can be eliminated.

In addition, in contrast to the conventional technology in which only the magnet and the core are adhesively fixed and the conventional technology in which only the cores are adhesively fixed to each other, in the present invention, since the cores are adhesively fixed while the magnet and the core are adhesively fixed, the strength of the motor core can be improved. can improve the quality of

Note that the adhesive application mechanism 11, the punching device 20, the magnet inserter 50, the pressure mechanism 55, and the heating mechanism 60 shown in FIG. 1 may be installed separately.
However, as shown in FIG. 7, if a heating mechanism 60 is attached to the pressurizing mechanism 55, the apparatus can be consolidated, which is more preferable.
Further, as shown in FIG. 2, if the adhesive application mechanism 11 is incorporated in the punching device 20, the devices can be consolidated, which is more preferable.

It should be noted that the punching device 20 shown in FIG. 2 is only an example, and may be changed as appropriate. For example, the adhesive application mechanism 11 may be provided outside the punching device 20 and in front of the punching device 20 .
The adhesive application mechanism 11, the magnet inserter 50, the pressurizing mechanism 55, and the heating mechanism 60 are only examples, and the configuration and the like may be changed as appropriate.

Also, the number and layout of the magnet holes 43 provided in the core 41 are not limited to the embodiment, and can be changed as appropriate.

The method of manufacturing the motor core using the adhesive application mechanism 11, the pressure mechanism 55, and the heating mechanism 60 described above can be summarized as follows.
That is, as shown in FIG. 5, the adhesive application mechanism 11 applies the one-liquid adhesive 15A in the form of dots to predetermined locations of the core 42 (adhesive application step). Next, as shown in FIG. 7, the pressure mechanism 55 applies an axial force to the laminated core 43 coated with the adhesive to spread it, and as shown in FIG. The remaining portion 15C2 is interposed between the adjacent cores 42 while being interposed in the gap between the magnet 51 and the magnet hole 44 (pressing step). Subsequently, the laminated core 43 is heated by the heating mechanism 60 shown in FIG. 7 to cure the adhesive (heating step).

According to this manufacturing method, dots of adhesive are spread out. Even after spreading, the area of the adhesive is not so large, evaporation of the central portion can be expected, and the desired adhesive strength can be secured. As a result, a one-liquid type adhesive can be adopted. A one-liquid type adhesive does not harden at room temperature, giving you more time to work.

Also, since the adhesive is applied in the form of dots, it does not protrude even if it is spread out. All of the adhesive can be used for bonding if there is no protrusion.
In addition, with the spread adhesive, the cores can be bonded together and the magnet can be bonded and fixed at the same time.
Therefore, according to the present invention, there is provided a method for manufacturing a motor core that allows time to spare in motor core manufacturing work, eliminates wasteful use of adhesive, and enables bonding between cores in addition to adhesion and fixation of magnets. be.

Alternatively, the motor core manufacturing method implemented using the adhesive application mechanism 11 and the pressure mechanism 55 can be summarized as follows.
That is, as shown in FIG. 5, the adhesive application mechanism 11 applies the one-liquid adhesive 15A in the form of dots to predetermined locations of the core 42 (adhesive application step). Next, as shown in FIG. 7, the pressure mechanism 55 applies an axial force to the laminated core 43 coated with the adhesive to spread it, and as shown in FIG. The residual portion 15C2 is interposed between the adjacent cores 42 while being interposed in the gap between the magnet 51 and the magnet hole 44, and the adhesive is hardened by pressurization (pressurization step).

According to this manufacturing method, dots of adhesive are spread out. Even after spreading, the area of the adhesive is not so large, evaporation of the central portion can be expected, and the desired adhesive strength can be secured. As a result, a one-liquid type adhesive can be adopted. A one-liquid type adhesive does not harden at room temperature, giving you more time to work.

Also, since the adhesive is applied in the form of dots, it does not protrude even if it is spread out. All of the adhesive can be used for bonding if there is no protrusion.
In addition, with the spread adhesive, the cores can be bonded together and the magnet can be bonded and fixed at the same time.
Therefore, according to the present invention, there is provided a method for manufacturing a motor core that allows time to spare in motor core manufacturing work, eliminates wasteful use of adhesive, and enables bonding between cores in addition to adhesion and fixation of magnets. be.

The present invention is suitable for manufacturing motor cores.

10 Motor core manufacturing apparatus 11 Adhesive application mechanism 15 One-liquid adhesive 15A Point adhesive 15C1 Adhesive interposed between magnet and magnet hole 15C2 Interposed between cores 20... Punching device 41... Strip-shaped thin steel plate 42... Core 43... Laminated core 44... Magnet hole 50... Magnet inserter 51... Magnet 55... Pressure mechanism 60... Heating mechanism 63... Motor core, 65... Coating point.

Claims (5)

A motor core in which a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated core, and the magnets are fixed to the laminated core with an adhesive. A motor core manufacturing method for obtaining
an adhesive application step of applying a one-liquid adhesive in the form of dots to predetermined locations of the core by an adhesive application mechanism;
A pressurizing mechanism applies an axial force to the laminated core coated with the adhesive to spread it, and part of the adhesive is interposed in the gap between the magnet and the magnet hole, and the remaining part is spread between the adjacent cores. A pressurizing step interposed in
and a heating step of heating the laminated core by a heating mechanism to cure the adhesive. A motor core in which a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated core, and the magnets are fixed to the laminated core with an adhesive. A motor core manufacturing method for obtaining
an adhesive application step of applying a one-liquid adhesive in the form of dots to predetermined locations of the core by an adhesive application mechanism;
A pressurizing mechanism applies an axial force to the laminated core coated with the adhesive to spread it, and part of the adhesive is interposed in the gap between the magnet and the magnet hole, and the remaining part is spread between the adjacent cores. and a pressurizing step of interposing the adhesive between the adhesive and hardening the adhesive by pressurization. A motor core in which a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated core, and the magnets are fixed to the laminated core with an adhesive. A motor core manufacturing apparatus for obtaining
This motor core manufacturing equipment
an adhesive application mechanism for applying a one-liquid adhesive in the form of dots to predetermined locations of the core;
Applying an axial force to the laminated core coated with the adhesive to spread it, and pressurizing to interpose a part of the adhesive in the gap between the magnet and the magnet hole and interpose the remaining part between the adjacent cores. a mechanism;
and a heating mechanism for heating the laminated core to cure the adhesive. A motor core in which a predetermined number of cores made of thin steel plates and provided with magnet holes for inserting magnets are laminated, the magnets are inserted into the obtained laminated core, and the magnets are fixed to the laminated core with an adhesive. A motor core manufacturing apparatus for obtaining
This motor core manufacturing equipment
an adhesive application mechanism for applying a one-liquid adhesive in the form of dots to predetermined locations of the core;
Axial force is applied to the laminated core coated with the adhesive to spread it, so that a part of the adhesive is interposed in the gap between the magnet and the magnet hole while the remaining part is interposed between the adjacent cores and applied. and a pressure mechanism for curing the adhesive by pressure. The motor core manufacturing apparatus according to claim 3 or 4,
A motor core manufacturing apparatus, wherein the adhesive application mechanism is installed in a punching device for punching out the core from a strip-shaped thin steel plate, and the application process is synchronized with the punching process.

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