JP3373370B2 - Manufacturing method of laminated core - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a laminated core. More specifically, the present invention relates to a method of manufacturing a laminated core formed by laminating a predetermined number of core plates punched by a series of progressive feeding.

[0002]

2. Description of the Related Art A laminated core of a motor is constructed by stacking a predetermined number of core plates punched into a predetermined shape by press working. A winding is applied to the laminated core, but in order to prevent damage to the insulating film between this winding and each core plate,
Conventionally, the burr portion generated at the time of punching the core plate has been removed or crushed. That is, in the post-pressing process, barrel polishing or blasting is performed to remove burrs caused by shearing, or chamfering punches or the like are used to crush the burrs in the slot portion (Actual flat No. 3-2624).
No. 9).

[0003]

However, when barreling or blasting is performed to remove the burr portion, another new step is required, which increases the manufacturing cost.

On the other hand, when the burr portion is crushed by using a chamfering punch or the like, it is necessary to manufacture the chamfering punch accurately in accordance with the shape of the winding portion of the laminated core, which is time-consuming and expensive. The chamfering punch is a consumable item that is worn away by crushing the burr,
The manufacturing cost of the laminated core increases. Also, it is difficult to make a curved surface for crushing the burr on the chamfer punch,
Actually, since the burr portion is crushed by the tapered surface chamfered at 45 degrees, the crushed burr portion may protrude laterally this time, which may also damage the insulating film. Further, even if a chamfered punch has a chamfered taper surface, the edge of the taper surface becomes a corner, and a corner is formed at the crushed portion, which may also destroy the insulating film.

It is an object of the present invention to provide a method for manufacturing a laminated core which can prevent the insulation film from being damaged by the burr by a series of steps without any extra effort.

[0006]

In order to achieve the above object, the present invention according to claim 1 punches core plates one after another while feeding plate-like materials at equal pitch intervals by a series of steps and stacks a predetermined number of sheets. In the method for manufacturing a laminated core,
A first barb is punched from one surface side to form a first burr on the other surface side at a position where a first core plate forming at least one end step in the laminating direction of the laminated core is formed. Of the plate material is punched from the other surface side in the first step of forming the slot holes of the second core plate and the second core plate forming the step of at least the other end in the stacking direction of the multilayer core. A second step of forming a second slot hole in which a second burr portion is formed on one surface side, and a position where the first and second core plates are formed after performing the first and second steps. The outer shape is punched from one direction to form the first and second core plates, and the first and second core plates are stacked in the order in which the outer shape is punched, and one end of the stack is stacked. The first core plate is arranged in the step of and the second core plate is arranged in the step of the other end, and It is characterized in that it comprises a third step of positioning the second back portion in the lamination interior.

Therefore, the first step and the second step are selectively performed, and the first slot hole is formed in the first step at a position where the first core plate of the plate-shaped material is formed. , Second
In the second step, a second slot hole is formed at the position where the core plate is molded. Thereafter, in the third step, the first and second core plates are distinguished from each other in the same direction without distinction, and the core plates are stacked in order as they are. The laminated core is wound using the slot holes of each core plate. The first core plate and the second core plate are opposite in the direction of punching out the slot holes, and the burr portions are formed on the opposite surfaces.
Since the core plates are stacked so that the first and second core plates are respectively located at the end steps, the burr portion that may damage the insulating layer is hidden in the stack, and the insulating layer may be damaged. Winding is applied to the drip.

In the method for manufacturing a laminated core according to a second aspect of the present invention, a core plate constituting one or the other end of the laminated core is provided with a dowel hole, and a core plate other than the core plate provided with the dowel hole is provided. When forming a half-drained caulking part for crimping on the core plate of and then stacking the core plates in the third step, the half-drained caulking part or caulking for caulking adjacent to each other is formed. It is characterized in that the core plates, which are fitted into the holes from the back side and are laminated, are integrated into a predetermined number of sheets.

Therefore, the first core plate and the second core plate are laminated.
The core plate is integrated by fitting the half crimped dowel portion for crimping and the half punched dowel portion or dowel hole for crimping adjacent thereto. However, since the dowel hole does not fit into the back side of the adjacent half-drained caulking portion for caulking, the core plates superposed at this position are separated. Since the dowel hole is formed only in the core plate located at the step at one end of the laminated core, the core plates forming one laminated core are integrated with each other, but form another laminated core. Separated from the core plate.

The method of manufacturing a laminated core according to claim 3 is characterized in that an insulating layer is coated on the surface of the laminated core after performing the third step. Therefore, the winding is applied from the outside of the insulating layer.

Further, in the method for manufacturing a laminated core according to the fourth aspect of the present invention, pilot holes are formed in the plate-shaped material at equal pitch intervals prior to the first step. Therefore, while accurately positioning the plate-shaped material, the first and second
And the third step is performed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of the present invention will be described below in detail based on the best mode shown in the drawings.

FIG. 1 shows an example of a strip layout when the method for manufacturing a laminated core according to the present invention is carried out, and FIG. 2 shows an example of a laminated core. The laminated core 1 is formed by laminating a predetermined number of, for example, five core plates 2 and 3 of two kinds, and caulking them to be integrated. In the present embodiment, the laminated core 1 is configured by stacking four second core plates 3 on one first core plate 2. That is, the first core plate 2 constitutes a step at one end of the laminated core 1, and the second core plate 3 constitutes three steps intermediate with the step at the other end of the laminated core 1. An insulating layer is formed on the outer surface of the laminated core 1 by powder, electrodeposition, coating or the like. In addition, in FIG. 1, # 1,
# 2, ..., # 11 indicate stage numbers, and the shaded portions indicate punching portions in the corresponding stage.

In the method of manufacturing the laminated core 1 according to the present invention,
By a series of steps, a sequential feeding process is performed in which the first and second core plates 2 and 3 are sequentially punched out while feeding the strip plate 4 which is a plate-shaped material at equal pitch intervals. That is, the first core plate 2 is
Laminated cores 1 are manufactured one after another while repeatedly punching four second core plates 3 after punching only one.

First, in the first stage (# 1) shown in FIG. 1, pilot holes 5 and 5 are formed on both sides of the strip plate 4 at equal pitch intervals.
To form. Each pilot hole 5 is formed by punching the strip plate 4 from the upper surface side toward the lower surface side. Each pilot hole 5 is for accurately positioning the strip plate 4 in each subsequent stage.

In the second stage (# 2), at the position where the first core plate 2 of the strip plate 4 is to be formed, the strip plate 4 is punched from one surface side and the first burr portion 6a is made to the other surface side. The step of forming the formed first slot hole 6 (first step) is performed. In this embodiment, as shown in an enlarged view in FIG. 3, the first slot hole 6 is formed by punching the strip plate 4 from the lower surface side and discharging the scrap 7 upward, that is, so-called upward punching. Therefore, the burr portion 6a is formed on the upper surface side, and the sag portion 6b is formed on the lower surface side.

The process performed in the second stage is performed only when the portion of the strip 4 on which the first core plate 2 is to be formed is sent to the second stage to form the second core plate 3. It is not done when the part to be sent is sent. That is, it is a process that is performed intermittently.

An example of a press device for intermittently forming the first slot holes 6 in the strip plate 4 is shown in FIGS. 4 and 5. When the slide plate 13 is retracted by the air cylinder 12, the irregularities of the slide plate 13 and the irregularities of the punch position adjusting plate 14 mesh with each other, and the slot punch 15 retracts, resulting in an idle state in which punching is impossible (Fig. 4). On the other hand, when the slide plate 13 is projected by the air cylinder 12, the unevenness of the slide plate 13 and the unevenness of the punch position adjusting plate 14 coincide with each other, so that the slot punch 15 can be projected to perform punching (FIG. 5). Air cylinder 12
Causes the slide plate 13 to project only when the molding position of the first core plate 2 is sent to the second stage.
In this press device, since the protrusion of the slot punch 15 is controlled by engaging the concave and convex portions of the slide plate 13 and the punch position adjusting plate 14, the moving distance of the slide plate 13 is shortened as compared with the case where it is controlled by a cam mechanism or the like. it can.

In FIGS. 4 and 5, reference numeral 16 is a slot removal die, reference numeral 17 is a scrap discharge port, and reference numeral 18 is a high pressure gas cushion.

In the third stage (# 3), the punching of the strip 4 is stopped, and the press die for the second stage and the like are used.
Prevents interference with the press die for the stage.

In the fourth stage (# 4), with respect to the molding position of the second core plate 3, the second slot hole is formed by punching the strip plate 4 from the other surface side to form the second burr portion 8a on the one surface side. The step of forming 8 (second step) is performed. In this embodiment, as shown in an enlarged view in FIG. 6, the second slot hole 8 is formed by punching the strip plate 4 from the upper surface side and discharging the scrap 7 downward so-called downward punching. Therefore, the burr portion 8a is formed on the lower surface side, and the droop portion 8b is formed on the upper surface side.

The process performed in the fourth stage is carried out only when the portion to form the second core plate 3 is sent to the fourth stage, that is, when the processing has not been performed in the second stage. Only done.

7 and 8 show an example of a pressing device for intermittently forming the second slot holes 8 in the strip plate 4. When the slide plate 13 is retracted by the air cylinder 12, the irregularities of the slide plate 13 and the irregularities of the punch position adjusting plate 14 mesh with each other, and the slot punch 15 retracts, resulting in an idle state in which punching is impossible (Fig. 7). On the other hand, when the slide plate 13 is projected by the air cylinder 12, the unevenness of the slide plate 13 and the unevenness of the punch position adjusting plate 14 match, and the slot punch 15 is projected to enable punching (FIG. 8). Air cylinder 12
Causes the slide plate 13 to project only when the molding position of the second core plate 3 is sent to the fourth stage.
In this press device, since the protrusion of the slot punch 15 is controlled by the engagement of the concave and convex portions of the slide plate 3 and the punch position adjusting plate 14, the moving distance of the slide plate 13 is shortened as compared with the case where it is controlled by a cam mechanism or the like. it can. Reference numeral 16 in FIGS. 7 and 8 denotes a slot punch die.

In the fifth stage (# 5), the first and second
At each position where the core plates 2 and 3 are to be formed, the large-diameter hole 9 is punched out from the strip plate 4 from one direction, for example, from the upper side surface.

In the sixth stage (# 6), the punching process is stopped to prevent the interference of the press dies used in the fifth stage and the seventh stage.

In the seventh stage (# 7), the first and second
At the position where the core plates 2 and 3 are formed, the semi-drained caulking portion 10 for caulking is formed in a convex shape. Half punched dowel for caulking 1
As for 0, as shown in detail in FIG. 9, the lower surface side of the strip plate 4 is convex and the upper surface side is concave. A plurality of, for example, three semi-blanked hollow portions 10 for caulking are formed near the slot hole 8.

In the eighth stage (# 8), the punching process is stopped to prevent interference with the press die used in the seventh and ninth stages.

In the ninth stage (# 9), at the position where the first core plate 2 is to be formed, the half-blanked hollow portion 10 formed on the strip plate 4 in the seventh stage is punched out from above. The hole 11 is formed. Regarding the position where the second core plate 3 is formed, the punch is controlled so as not to punch the semi-drilled recess formed in the seventh stage, and the dowel hole 11 is not formed. That is, the first core plate 2 that constitutes the lowest stage (stage at one end) of the laminated core 1 by the seventh stage and the ninth stage.
While the dowel hole 11 is provided in the core plate other than the first core plate 2 provided with the dowel hole 11
Is formed.

In the tenth stage (# 10), the punching process is stopped to prevent the press dies used in the ninth and eleventh stages from interfering with each other.

In the eleventh stage (# 11), from the one direction of the portion where the first and second core plates 2 and 3 are to be formed,
In the present embodiment, the outer shape is removed from above and the first and second
The core plates 2 and 3 are formed. And the first punched out
The second core plates 2 and 3 are pushed into the stacker attached to the die by a punch and are stacked in the order in which the outer shapes are removed.

Since only one first core plate 2 is punched out from the strip plate 4 and four second core plates 3 are punched out in succession, it is at the bottom of the stack for each laminated core 1 in the stacker. The first core plate 2 is arranged, and the second core plate 3 is arranged at the uppermost stage. As described above, the first core plate 2
In the shearing portion of the slot hole 6 of the
a has a dull portion 6b formed on the lower surface side. Further, in the shearing portion of the slot hole 8 of the second core plate 3, a burr portion 8a is formed on the lower surface side and a dull portion 8b is formed on the upper surface side. Therefore, the first and second core plates 2 and 3 are attached to the strip plate 4.
When laminated in the order punched out from, as shown in FIG. 10, the burr portions 6a and 8a formed on the shearing surfaces of the slot holes 6 and 8 are located in the laminated layer while the sag portions 6 are formed.
b and 8b are located outside the stack on which the windings are applied. In this way, the third step is performed.

When stacking the core plates 2 and 3 in the stacker, the core plates 2 and 3 are directly pushed into the stacker by a punch. Therefore, as shown in FIG. 9, the caulking half-deep recesses 10 formed on the four second core plates 3 are formed.
Are formed in the adjacent half-drained caulking portion 10 for caulking or the first core plate 2 to be overlapped with each other, and are fitted into the hollow holes 11 from the back side, in this embodiment from the upper side. On the other hand, the dowel hole 11 of the first core plate 2 does not fit into the upper side of the caulking half-drained dowel part 10 of the second core plate 3. Therefore, five core plates 2 and 3 are integrated with each other with the boundary between the second core plate 3 extracted fourth and the first core plate 2 extracted next to manufacture the laminated core 1. To be done.

After that, an insulating layer is formed on the outer surface of the laminated core 1 by powdering, electrodeposition, painting or the like. Next, the winding portion of the laminated core 1 formed by the slot holes 6 and 8 is wound. The burr portions 6a and 8a of the slot holes 6 and 8 are located in the laminated layer, and the salient portions 6b and 8b form the corner portions of the winding portion of the laminated core 1. Does not destroy the insulating layer during work.

The above-described embodiment is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

For example, in the above description, only the lowermost core plate is composed of the first core plate 2 and all the other core plates are composed of the second core plate 3. The number of plates 2 may be increased and the number of second core plates 3 may be decreased. In this case, the dowel hole 11 is formed in the lowermost one of the increased first core plates 2, and the other first core plate 2 and the second core plate 3 are half-blanked. The recess 10 is formed. Further, it is not always necessary to stack five core plates to form the laminated core 1, and the number of core plates forming the laminated core 1 may be four or less or six or more.

[0036]

As described above, in the method for manufacturing a laminated core according to the first aspect, at the position where the first core plate forming at least one end step in the laminating direction of the laminated core is formed, A first step of punching a plate-shaped material from one surface side to form a first slot hole in which a first burr portion is formed on the other surface side, and a step of at least the other end in the laminating direction of the laminated core are configured. A second step of punching a plate-shaped material from the other surface side to form a second slot hole in which the second burr portion is formed on the one surface side at the position where the second core plate is formed; After performing the first and second steps, the outer shape is removed from one direction at the position where the first and second core plates are formed to form the first and second core plates, and the first and second core plates are formed.
And the second core plates are stacked in the order in which the outlines are removed, and the first core plate is arranged at the stage at one end of the stack and the second core plate is arranged at the stage at the other end. The third step of arranging the first and second burr portions on the inner side in the stacking direction is included, and the burr portion on the shear surface which may damage the insulating film is hidden inside the stack. While it is possible to prevent contact with the wires, it is possible to arrange the drip portion at a corner of the winding portion of the laminated core. Therefore, the thin film for insulation is not damaged, the insulating property is maintained, and the generation of defective products is prevented. Further, another step such as barrel polishing for removing the burr portion of the sheared surface is not necessary, and the productivity is improved.

Further, in the method for manufacturing a laminated core according to the second aspect, a dowel hole is provided in the core plate constituting one or the other end of the laminated core, and a core plate other than the dowel hole provided with the dowel hole is provided. When forming a half-drained caulking part for crimping on the core plate of and then stacking the core plates in the third step, the half-drained caulking part or caulking for caulking adjacent to each other is formed. The core plates are fitted into the holes from the back side and are laminated every predetermined number of core plates, so that a predetermined number of core plates can be integrated in a series of steps, further improving the productivity. be able to.

Further, in the method for manufacturing a laminated core according to the third aspect of the invention, after the third step is performed, the surface of the laminated core is coated with an insulating layer. It can be performed.

Further, in the method for manufacturing a laminated core according to the fourth aspect, the pilot holes are formed in the plate-shaped material at equal pitch intervals prior to the first step, so that the plate-shaped material is accurately formed. The first, second and third steps can be performed while positioning.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a strip layout when a method for manufacturing a laminated core according to the present invention is carried out.

FIG. 2 is an end view of a laminated core manufactured by the method according to the present invention.

FIG. 3 is an enlarged view of a shear plane in the second stage of FIG.

FIG. 4 is a cross-sectional view showing a mold device used in the second stage of FIG. 1 in an idle state.

5 is a cross-sectional view of the die device of FIG. 4 in a processed state.

FIG. 6 is an enlarged view of a shear surface in the fourth stage of FIG.

FIG. 7 is a cross-sectional view showing a mold device used in the fourth stage of FIG. 1 in an idle state.

8 is a cross-sectional view of the die device of FIG. 7 in a processed state.

9 is a cross-sectional view of each core plate showing a fitting relationship between a half-drained caulking portion for caulking and a dowel hole of the laminated core shown in FIG. 2;

10 is a cross-sectional view of a winding portion of the laminated core shown in FIG.

[Explanation of symbols]

1 laminated core 2 First core plate 3 Second core plate 4 strips (plate material) 6 First slot hole 6a First burr section 6b First salient part 8 Second slot hole 8a Second burr section 8b Second sag 10 Half-blanked dowel for crimping 11 Dowel hole

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Claims (4)

(57) [Claims] 1. A method of manufacturing a laminated core in which a plate-shaped material is sent at equal pitch intervals by a series of steps to sequentially punch out core plates and stack a predetermined number of layers, and at least one step in the lamination direction of the laminated core is A first step of punching the plate-shaped material from one surface side to form a first slot hole having a first burr portion formed on the other surface side at a position where a first core plate to be formed is formed; The second barb portion is formed on one surface side by punching out the plate-shaped material from the other surface side at a position where the second core plate forming at least the other end step in the laminating direction of the laminated core is formed. After performing the second step of forming the second slot hole and the first and second steps, the outer shape is removed from one direction at a position where the first and second core plates are formed. And forming the first and second core plates Together, these first and second core plates are laminated in the order in which the outer shape is removed, and the first core plate is provided on the stage at one end of the lamination and the second core plate is provided on the stage at the other end. And a third step of arranging the first and second burr portions inward in the stacking direction, and manufacturing the laminated core. 2. A semi-drained caulking portion for caulking on a core plate constituting one or the other end of the laminated core while forming a dowel hole in the core plate other than the core plate having the dowel hole. And stacking the core plates in the third step, the half-drained caulking dowels for caulking are overlapped with each other and are fitted into the half-drained caulking part for adjoining or the dowel hole from the back side for lamination. 2. The method for manufacturing a laminated core according to claim 1, wherein the respective core plates are integrated into a predetermined number. 3. The method of manufacturing a laminated core according to claim 1, wherein an insulating layer is coated on the surface of the laminated core after performing the third step. 4. The method for manufacturing a laminated core according to claim 1, wherein pilot holes are formed in the plate-shaped material at equal pitch intervals prior to the first step.