JPH1098856A - Manufacturing method of laminated core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage on an insulating film due to a burr generated by shearing in a series of steps without particular labor hours. SOLUTION: Core plates are sequentially punched while a plate material is being fed at a constant pitch interval by a series of steps, and the plates are stacked at each predetermined number of the plates. At a second stage, a strip 4 is punched from a lower surface side at a molding position of the first core plates for constituting a lowermost stage of the laminated core, and a first slot hole 6 where a burr is formed at an upper surface side is perforated. At a fourth stage, the strip 4 is punched from an upper surface side at a molding position of the second core plate for constituting uppermost and intermediate stages of the core, and a second slot hole 8 where a second burr is formed at a lower surface side is perforated. At eleventh stage, first and second core plates are molded by outline punching from one direction, and laminated in the order. The first core plate is disposed at the lowermost stage, the second core plate is disposed at the uppermost stage, and the respective burrs are disposed in a laminated layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for manufacturing a laminated core. More specifically, the present invention relates to a method for manufacturing a laminated core formed by laminating a predetermined number of core plates punched by a series of progressive processing.

[0002]

2. Description of the Related Art A laminated core of a motor is formed by laminating 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 breakdown of the insulation film between this winding and each core plate,
Conventionally, burrs generated during punching of a core plate have been removed or crushed. That is, barrel polishing or blasting is performed in the post-process of press working to remove burrs generated by shearing, or burrs in the slot portion are crushed using a chamfering punch or the like (actually disclosed in Japanese Unexamined Utility Model Publication No. Hei 3-2624).
No. 9).

[0003]

However, in the case of removing the burr portion by performing barrel processing or blast processing, another new step is required and the manufacturing cost is increased.

On the other hand, in the case of using a chamfer punch or the like to crush the burr portion, it is necessary to accurately manufacture the chamfer punch in accordance with the shape of the winding portion of the laminated core. In addition to the cost of manufacturing, the chamfer punch is a consumable that wears out by crushing the burrs,
The manufacturing cost of the laminated core increases. Also, it is difficult to make a curved surface to crush the burr part with a chamfer punch,
Actually, since the burrs are crushed by the tapered surface chamfered at 45 degrees, the crushed burrs may protrude to the side this time, and the insulating film may be broken. Further, even if a chamfered punch is formed with a chamfered tapered surface, the edge of the tapered surface becomes a corner, and a corner is formed in the crushed portion, which may also break the insulating film.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a laminated core capable of preventing an insulating film from being destructed by a burr portion by a series of steps without special labor.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a predetermined number of core plates are punched out by punching out core plates one after another while feeding plate-like materials at a constant pitch by a series of steps. In a method for manufacturing a laminated core,
At the position where the first core plate constituting the step of at least one end in the laminating direction of the laminated core is formed, a plate-shaped material is punched from one surface side to form a first burr portion on the other surface side. A plate material is punched out from the other surface side at a position where a first step of forming a slot hole is formed and at least a second core plate constituting a step at the other end in the stacking direction of the stacked core is formed. A second step of forming a second slot hole having a second burr portion 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 removed 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 was removed, and one end of the stack is formed. The first core plate is arranged in the first stage, and the second core plate is arranged in the other end stage. 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 at the position where the first core plate of the plate-like material is formed in the first step. , Second
In the second step, a second slot hole is formed at a position where the core plate is formed. Thereafter, in a third step, the outer shape is removed from the same direction without distinction between the first and second core plates, and the first and second core plates are sequentially stacked as they are. A winding is applied to the laminated core using slot holes of each core plate. In the first core plate and the second core plate, the directions in which the slot holes are punched are opposite, and the barbs are formed on the opposite surfaces.
Since the core plates are overlapped so that the first and second core plates are located at the end steps, the burrs that may destroy the insulating layer are hidden in the stack and the insulating layer may be destroyed. The winding is applied to the drooping part.

According to a second aspect of the present invention, there is provided a method for manufacturing a laminated core, wherein a dowel hole is provided in a core plate constituting one or the other end of the laminated core, and a core plate other than the core plate having the dowel hole is provided. When forming the semi-bent dowel for caulking on the core plate of the above, and laminating each core plate in the third step, the semi-blanked dove for caulking or the dowel which overlaps the semi-bent dowel for caulking Each core plate is fitted into the hole from the back side and laminated to form a predetermined number of core plates.

Therefore, the laminated first core plate and the second core plate
The core plate is integrated with the crimping half-bent dowel portion and the adjacent crimping half-bent dowel portion or dowel hole. However, since the dowel holes do not get stuck on the back side of the caulking half blanking dowel portion adjacent thereto, the core plates superposed at this position are separated. Since the dowel holes are formed only in the core plate located at the step at one end of the laminated core, the core plates constituting one laminated core are integrated with each other, but constitute another laminated core. It is separated from the core plate.

In the method of manufacturing a laminated core according to a third aspect, after performing the third step, the surface of the laminated core is coated with an insulating layer. Therefore, the winding is applied from outside the insulating layer.

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

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration 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 of 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 obtained by integrating two types of core plates 2 and 3 by a predetermined number of sheets, for example, five sheets, and caulking them. 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 stage at one end of the laminated core 1, and the second core plate 3 constitutes three intermediate stages with the stage 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, painting or the like. In FIG. 1, # 1,
# 2,..., # 11 indicate stage numbers, and hatched portions indicate punched portions in the corresponding stages.

In the method for manufacturing the laminated core 1 according to the present invention,
In a series of steps, the first and second core plates 2 and 3 are successively punched while the strips 4 as plate materials are fed at equal pitch intervals. That is, the first core plate 2 is
The laminated cores 1 are manufactured one after another by repeatedly punching out four second core plates 3 after punching out only one core core.

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

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

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

FIGS. 4 and 5 show an example of a press device for intermittently drilling the first slot holes 6 in the strip 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 is retracted to be in an idle state where punching cannot be performed. 4). On the other hand, when the slide plate 13 is made to protrude by the air cylinder 12, the concavity and convexity of the slide plate 13 and the concavity and convexity of the punch position adjusting plate 14 match, so that the slot punch 15 can be protruded to perform the punching process (FIG. 5). Air cylinder 12
Makes the slide plate 13 protrude 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 of controlling by the cam mechanism or the like. it can.

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

In the third stage (# 3), the punching of the strip 4 is stopped, and
Prevents interference with stage press dies.

In the fourth stage (# 4), a second slot hole formed by punching the band plate 4 from the other side and forming the second burr 8a on one side with respect to the molding position of the second core plate 3. 8 (a second step). In the present embodiment, as shown in an enlarged manner in FIG. 6, the strip 4 is punched from the upper surface side, and the scrap 7 is discharged downward so-called downward punching, and the second slot hole 8 is formed. 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 step performed in the fourth stage is performed only when a portion where the second core plate 3 is to be formed is sent to the fourth stage, that is, when the processing is not already performed in the second stage. Only done.

FIGS. 7 and 8 show an example of a press device for intermittently forming the second slot holes 8 in the band 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 is retracted to be in an idle state where punching cannot be performed. 7). On the other hand, when the slide plate 13 is made to protrude by the air cylinder 12, the concavity and convexity of the slide plate 13 and the concavity and convexity of the punch position adjusting plate 14 coincide with each other, so that the slot punch 15 is protruded to enable the punching process (FIG. 8). Air cylinder 12
Makes the slide plate 13 protrude only when the molding position of the second core plate 3 is sent to the fourth stage.
In this press device, the protrusion of the slot punch 15 is controlled by engaging the concave and convex portions of the slide plate 3 and the punch position adjusting plate 14, so that the moving distance of the slide plate 13 is reduced as compared with the case of controlling by a cam mechanism or the like. it can. Reference numeral 16 in FIGS. 7 and 8 denotes a slot punching die.

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

In the sixth stage (# 6), the punching operation is stopped to prevent interference with a press die used in the fifth and seventh stages.

In the seventh stage (# 7), the first and second stages
At the position where the core plates 2 and 3 are formed, the half blanking dowel portion 10 for caulking is formed in a convex shape. Half empty dowel for caulking 1
9, the lower surface of the strip 4 is convex and the upper surface is concave, as shown in FIG. A plurality of, for example, three spots are formed in the vicinity of the slot hole 8.

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

At the ninth stage (# 9), the half blank dowel portion 10 formed on the strip 4 at the seventh stage is punched out from above at the position where the first core plate 2 is to be formed. A hole 11 is formed. At the position where the second core plate 3 is formed, the punch is controlled so as not to punch out the half blanking dowel portion formed in the seventh stage, and the dowel hole 11 is not formed. That is, the first core plate 2 constituting the lowermost stage (one end stage) of the laminated core 1 is composed of 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 in which the dowel hole 11 is provided,
Is formed.

In the tenth stage (# 10), the punching operation is stopped to prevent interference with the press dies used in the ninth and eleventh stages.

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

Since only one first core plate 2 is punched from the band plate 4 and four second core plates 3 are continuously punched, the first core plate 2 is punched out continuously, so that the lowermost stage of lamination for each laminated core 1 in the stacker is formed. , A first core plate 2 is arranged, and a second core plate 3 is arranged at the top. As described above, the first core plate 2
In the shearing portion of the slot hole 6 of the
a has a drooping portion 6b formed on the lower surface side. Further, in the sheared portion of the slot hole 8 of the second core plate 3, a barbed portion 8a is formed on the lower surface side and a barbed portion 8b is formed on the upper surface side. Therefore, the first and second core plates 2 and 3 are
When the layers are laminated in the order punched out from each other, as shown in FIG. 10, each of the burr portions 6a and 8a formed on the shearing surface of each of the slot holes 6 and 8 is located in the lamination, while each of the barbs 6a
b and 8b are located outside of the stack where the winding is applied. Thus, the third step is performed.

When stacking the core plates 2 and 3 in the stacker, the core plates 2 and 3 are pressed into the stacker as they are by a punch. Therefore, as shown in FIG. 9, the half blanking dowel portions 10 formed on the four second core plates 3 are formed.
Are inserted into the adjacent semi-drilled dowel portion 10 or the first core plate 2 to be overlapped from the back hole 11 in the present embodiment from the back side, in this embodiment. On the other hand, the dowel hole 11 of the first core plate 2 does not fit above the crimping half dowel portion 10 of the second core plate 3. Therefore, the laminated core 1 is manufactured by integrating the core plates 2 and 3 five by five with the boundary between the second core plate 3 pulled out as the fourth sheet and the first core plate 2 drawn out next. Is done.

After that, an insulating layer is formed on the outer surface of the laminated core 1 by powder, electrodeposition, painting or the like. Next, a winding is applied to the winding portion of the laminated core 1 formed by the slot holes 6 and 8. Each of the barbs 6a, 8a of each of the slot holes 6, 8 is located in the lamination, and each of the barbs 6b, 8b forms a corner of the winding portion of the laminated core 1, so that the windings are formed. Does not destroy the insulating layer during operation.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, 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 constituted by the first core plate 2 and all other core plates are constituted by the second core plate 3. The number of the second core plates 3 may be reduced while increasing the number of the plates 2. In this case, the dowel hole 11 is formed only 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 partially punched. An embossed portion 10 is formed. Further, it is not necessary to form the laminated core 1 by stacking five core plates, and the number of core plates constituting the laminated core 1 may be four or less or six or more.

[0036]

As described above, the method for manufacturing a laminated core according to the first aspect of the present invention includes the steps of: forming a first core plate forming at least one end step in the laminating direction of the laminated core; A first step of punching a plate-like material from one surface side to form a first slot hole having a first burr portion formed on the other surface side, and a step of at least the other end in the laminating direction of the laminated core. A second step of punching a plate-shaped material from the other surface side to form a second slot hole formed on one surface side at a position where a second core plate to be formed is formed; After performing 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 to form the first and second core plates, and the first and second core plates are formed.
And the second core plate are stacked in the order in which the outer shape was removed, and the first core plate is arranged at one end of the stack and the second core plate is arranged at the other end of the stack. And a third step of positioning the first and second burrs on the inner side in the stacking direction, so that the burrs on the shearing surface that may break the insulating film are hidden inside the stack and wound. While the contact with the wire can be prevented, a drooping portion can be arranged at a corner of the winding portion of the laminated core. For this reason, the thin film for insulation is not damaged, the insulation is maintained, and the occurrence of defective products is prevented. Further, a separate step such as barrel polishing for removing the burrs of the sheared surface is not required, and the productivity is improved.

In the method for manufacturing a laminated core according to a second aspect of the present invention, a dowel hole is provided in a core plate constituting one or the other end of the laminated core, and a core plate other than the core plate having the dowel hole is provided. When forming the semi-bent dowel for caulking on the core plate of the above, and laminating each core plate in the third step, the semi-blanked dove for caulking or the dowel which overlaps the semi-bent dowel for caulking Since the core plates, which are fitted into the holes from the back side and are laminated, are integrated every predetermined number, the predetermined number of core plates can be integrated by a series of steps, further improving the productivity. be able to.

In the method for manufacturing a laminated core according to the third aspect, the insulating layer is coated on the surface of the laminated core after performing the third step. It can be performed.

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

[Brief description of the drawings]

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

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

FIG. 3 is an enlarged view of a shear plane in a second stage of FIG. 1;

FIG. 4 is a sectional view showing a mold apparatus used in a second stage of FIG. 1 in an idle state.

5 is a cross-sectional view of the mold device of FIG. 4 in a processing state.

FIG. 6 is an enlarged view of a shear plane in a fourth stage in FIG. 1;

FIG. 7 is a cross-sectional view illustrating a mold apparatus used in a fourth stage in FIG. 1 in an idle state.

FIG. 8 is a cross-sectional view of the mold apparatus of FIG. 7 in a processing state.

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

FIG. 10 is a sectional view of a winding portion of the laminated core of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 laminated core 2 first core plate 3 second core plate 4 band plate (plate-like material) 6 first slot hole 6a first burr portion 6b first droop portion 8 second slot hole 8a second Burl portion 8b Second drooping portion 10 Half hollow portion for crimping 11 Dowel hole

Claims (4)

[Claims] 1. A method of manufacturing a laminated core, in which a predetermined number of core plates are punched out successively while feeding a plate-shaped material at a constant pitch by a series of steps, at least one end step in the laminating direction of the laminated core is performed. A first step of punching the plate-shaped material from one surface side to form a first slot hole having a first barb formed on the other surface side at a position where the first core plate to be formed is formed; At a position where a second core plate constituting at least the other end step in the stacking direction of the stacked core is formed, the plate material is punched from the other surface to form a second burr portion on one surface. After performing the second step of forming a 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. To form the first and second core plates. In both cases, the first and second core plates are laminated in the order in which the outer shape was removed, the first core plate was placed on one end of the laminate, and the second core plate was placed on the other end. And a third step of arranging the first and second burrs inward in the stacking direction. 2. A dowel hole is formed in a core plate constituting a step at one or the other end of the laminated core, and a half blanking dowel portion is formed on a core plate other than the core plate having the dowel hole. When the core plates are laminated in the third step, the caulking half blanking dowel portion is overlapped with the adjacent half blanking dowel portion or the dowel hole adjacent to the laminating portion, and laminated. 2. The method for manufacturing a laminated core according to claim 1, wherein each of said core plates is integrated every predetermined number of sheets. 3. The method for manufacturing a laminated core according to claim 1, wherein, after performing the third step, an insulating layer is coated on a surface of the laminated core. 4. The method for manufacturing a laminated core according to claim 1, wherein prior to the first step, pilot holes are formed in the plate material at equal pitch intervals.