JP2000334523A - Method of manufacturing unit laminated body for annular laminated core - Google Patents

Abstract

(57) [Abstract] [Problem] To reduce the die size in the direction orthogonal to the feed direction to reduce the total punching load, reduce the equipment cost,
Provided is a method for manufacturing a unit laminated body for an annular laminated iron core, which does not require a wide band-shaped steel plate and therefore does not increase in weight when wound into a coil shape and is easy to handle when transported or mounted on a mold device. I do. SOLUTION: A connecting unit plate 1 in which a predetermined number of divided pieces are connected in a shape in which one annular laminated iron core is developed is formed from a long strip-shaped steel plate intermittently fed using a progressive die to a predetermined stacking thickness. A method of manufacturing a unit laminated body in which punching processes are sequentially performed by the number of sheets and interconnected via a caulking connecting means and laminated, wherein in an outer shape punching and laminating step (step 3) using a progressive die, a connecting unit plate is formed. 1 is punched in tandem along the feeding direction of the strip-shaped steel plate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of sequentially punching a connecting unit plate having a shape in which an annular core is developed from a long strip steel plate by using a progressive die, and connecting the punched connecting unit plates in a laminated state. The present invention relates to a method of manufacturing a unit laminated body for an annular laminated iron core in which a unit laminated body is produced by caulking and joining together, and can be used, for example, for producing a laminated stator for a motor for home appliances and general industries.

[0002]

2. Description of the Related Art When manufacturing an annular core such as a laminated stator for a motor, a predetermined number of annular cores are developed in order to facilitate winding work on the magnetic poles of the stator. The connecting unit plate 1 in which the divided pieces are connected is sequentially punched by the number of sheets having a predetermined stacking thickness,
1A, a unit laminated body 2 as shown in FIG. 1A is manufactured in advance, and after winding work on the magnetic poles is performed, each of the unit laminated bodies 2 is formed using a jig. A split core piece system in which a connecting portion between the split pieces 3 is deformed to form an annular core 4 as shown in FIG.

[0003] With regard to a method and an apparatus for manufacturing such a unit laminate 2, the present applicant has previously described Japanese Patent Application Laid-Open No. 9-216.
No. 020 has been proposed, but in this invention, the longitudinal direction of each connecting unit plate 1 is orthogonal to the feeding direction of a long strip-shaped steel plate intermittently fed by a progressive die. Punching (hereinafter referred to as row punching).

[0004]

According to the conventional technique of punching in a row, a wide strip-shaped steel sheet having a width equal to or more than the length where the annular core is developed is used, and for each pitch intermittently fed to the strip-shaped steel sheet. Punching of the connection unit plates is performed in a parallel state along the feed direction.

For this reason, the size of the die is increased in the direction orthogonal to the feed direction and the total punching load is increased as compared with a normal progressive die device, so that a special dedicated die device is required. When a wide strip-shaped steel sheet is wound in a coil shape, the weight increases, and handling during transport or mounting on a mold apparatus is inconvenient.

In this type of mold apparatus, when connecting the upper and lower parts of the connecting unit plate, a caulking projection or the like is cut and raised in advance as a caulking connecting means, and the unit laminated body 1 is formed. The connecting unit plate 1 having been punched by a required number of sheets is punched with a measuring hole instead of the caulking means, and the next unit laminated body 2 is punched.
There is provided a weighing means for separating from the pressure.

For example, in the connecting unit plate 1 shown in FIG. 1 in which the number of the divided pieces 3 is six and the caulking connection means 5 is provided at three places for each divided piece, the caulking projections 5 are used as the caulking connection means. In the case of the conventional technique of punching, it is necessary to mount a punch and a die for forming projections at 18 places (6 × 3 = 18), and the measuring means are provided at the same number of six places as the divided pieces 3. Had to be kept.

[0008] For this reason, not only the size of the mold apparatus is increased, but also the number of parts in the mold is increased and the mold is complicated.
There is a possibility that the cost of the mold apparatus may increase, and more labor may be required in terms of maintenance.

Accordingly, the present invention further improves the previously proposed invention of manufacturing a unit laminated body for an annular laminated iron core by the split core piece method by horizontal punching, and can solve the above-mentioned problem by solving the above-mentioned problem. In particular, in connection with the above-mentioned horizontal punching, a connecting unit plate corresponding to one annular iron core is punched in a state along the feeding direction of the strip-shaped steel plate (hereinafter, referred to as a column-wise punching process). This is called punching).

[0010]

According to the present invention, there is provided a long strip-shaped intermittently fed connecting unit plate formed by connecting a predetermined number of divided pieces in a shape in which one annular laminated iron core is developed. A method of manufacturing a unit laminated body in which a plurality of sheets are sequentially punched from a steel sheet by a number corresponding to a predetermined stacking thickness, and are interconnected and stacked via a caulking connection means, wherein the outer shape punching and laminating step by the progressive die is used. In the above, the connection unit plate is punched in a tandem punching state along the feed direction of the strip-shaped steel plate. (Claim 1)

In the manufacturing method of the first aspect, the connecting unit plate is punched in a state of being pierced in a row along the feeding direction of the strip-shaped steel sheet, so that the connecting unit plate can be formed in the feeding direction in comparison with the prior art in which the strip-shaped steel sheet is horizontally punched. Since the total punching load is reduced by reducing the size of the mold in the orthogonal direction, special dedicated mold equipment is not required, and equipment costs can be reduced, and a wide strip steel plate is not required. It is easy to handle when transported or mounted on a mold device without increasing the weight when wound in a coil shape.

Further, in the case of horizontal punching, it is necessary to simultaneously form the caulking means and the measuring means for each of the divided pieces constituting the connecting unit plate. Since the divided pieces can be sequentially formed, the number of punches and dies forming them can be greatly reduced (the number of divided pieces minus one), and the size of the mold can be reduced and the size of the inside of the mold can be reduced. , The cost can be reduced and the maintainability can be improved.

In the manufacturing method according to the first aspect, the punching of the connecting unit plate may be performed by a pilot hole punching step,
The process is performed by the punches and dies of the progressive die arranged in a line along the feed direction of the strip-shaped steel sheet in the order of the measuring hole punching step, the caulking connecting means forming step, and the outer shape punching and laminating step. (Claim 2)

According to a second aspect of the present invention, there is provided a structure in which a punch and a die for performing an outer shape punching and laminating step are adapted to a connecting unit plate for a progressive die having a method of punching out and laminating annular cores one by one. Therefore, the progressive die can be manufactured inexpensively and easily by sharing parts.

[0015] In the manufacturing method of the first aspect, the punching of the connecting unit plate may include a pilot hole punching step,
In the order of the measuring hole punching step and the caulking coupling means forming step, after being performed by each punch and each die of the progressive die arranged in two rows in front and rear along the feeding direction of the strip-shaped steel sheet, the front row or the rear row In the order of one outer shape punching and laminating step and the other outer punching and laminating step in the front row or the rear row, the punching and the dies of the progressive die are arranged along the feeding direction of the strip-shaped steel sheet. (Claim 3)

In the manufacturing method according to the third aspect, the pilot hole punching step, the measuring hole punching step, and the caulking connecting means forming step are performed simultaneously in the front and rear rows, so that two connecting unit plates can be efficiently picked up and the outer shape punching and laminating is performed. When the process is performed simultaneously in the front and rear rows, the unbalanced load can be improved.

In the manufacturing method according to the first aspect, the punching of the connecting unit plate may be performed by a pilot hole punching step,
In the order of the measuring hole punching step, the caulking connection means forming step, and the outer shape punching and laminating step, the step is performed by each punch and each die of the progressive die arranged in one of the front row or the rear row along the feeding direction of the strip-shaped steel sheet. After that, in the order of the pilot hole punching step, the measuring hole punching step, the caulking coupling means forming step, and the outer shape punching and laminating step, the progressive die is arranged in the front row or the rear row along the feeding direction of the strip-shaped steel sheet. Performed by each punch and each die. (Claim 4)

According to the manufacturing method of the fourth aspect, the simple operation of repeating the same steps makes it easy for the connecting unit plate 2 to be connected.
In addition to the fact that individual cutting can be performed, uneven load can be improved when the outer shape punching and laminating step is performed simultaneously in front and rear rows.

In the manufacturing method according to the first aspect, the punching of the connecting unit plate may include a pilot hole punching step,
Each punch and each die of the progressive die arranged in one of the front row or the rear row along the feeding direction of the strip-shaped steel sheet in the order of the caulking coupling means forming step and the outer shape punching and laminating step,
After the pilot hole punching step and the caulking coupling means forming step are performed by each punch and each die of the measuring hole punching step arranged in both the front row and the rear row,
Pilot hole punching process, caulking coupling means forming process,
In the order of the outer shape punching and laminating step, the punching and the dies of the progressive die are arranged in the front row or the rear row along the feed direction of the strip-shaped steel sheet. (Claim 5)

In the manufacturing method according to the fifth aspect, the measuring hole punching step is performed simultaneously at a time, so that the connecting unit plate can be easily mounted.
In addition to the fact that individual cutting can be performed, uneven load can be improved when the outer shape punching and laminating step is performed simultaneously in front and rear rows.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a unit laminated body for an annular laminated core according to the present invention will be described in detail with reference to the accompanying drawings showing an embodiment thereof. The layout of the punching process is shown in FIG. 3. FIG. 3 is a longitudinal sectional view of a main part of a progressive die 7 as a manufacturing apparatus. The punching of a product is performed by a pilot hole punching process of punching a pilot hole 8 for feeding a strip-shaped steel plate 6. Started after implementation.

In the punching process of the product, in the measuring hole punching step of the first step (1), the measuring holes 9 are punched in the connecting unit plate 1 laminated on the first sheet, and the second step (2) is performed. In the caulking connecting means forming step, the caulking projections 5 are cut and raised as caulking means for the connecting unit plates 1 to be laminated on the second and subsequent sheets. The outer shape of each connecting unit plate 1 is pulled out, and a predetermined number of the connecting unit plates 1 are caulked and connected in a stacked state via the caulking projections 5 to be taken out as a unit laminated body 2 for one product.

The progressive die 7 for performing these punching steps is composed of an upper die 7A and a lower die 7B. On the upper die 7A side, an upper die holder 10, an upper die backing plate 11,
A punch plate 12, a stripper body 13, and a stripper plate 14 are provided, and a lower mold 7B is provided with a lower mold holder 15, a die plate 16, a material guide 17, and a material receiving plate 18.

In order to punch the feed pilot hole 8 and to perform the steps (1) and (2), a pilot punch 19, a measuring punch 20 and a cut-and-punch punch 22 are provided on the upper die 7A side. The lower die 7B is provided with a pilot blanking die 23, a measuring die 24, and a cutting and raising die 25.

The measuring punch 20 is always at a standby position in which the tip is retracted upward to make punching impossible, and the measuring punch 20 is moved to a punching position in which the tip protrudes downward every time measurement is performed. The punch control means controls the slide cam 21 by switching the slide cam 21 with a driving means 26 such as a cylinder or an electromagnet, as shown in FIG. 4, for example.

Further, in order to carry out step (3), an outer shape punch 28 supported by a punch holder 27 is provided on the upper die 7A side, and an outer shape die 29 and a squeeze ring holder 30 are provided on the lower die 7B side. Is provided with a squeeze ring 31, and the outer shape punch 28 and the outer shape die 29 punch out the connection unit plate 1 in a state where a predetermined number of divided pieces 3 are connected along the feeding direction of the strip-shaped steel plate 6 ( The punch 28 has a punching and die shape, and the punching pin 3 for the caulking projection 5 is
2 is installed.

The outer shape punch 28 has a position between a punching position at which the tip is projected downward to enable punching of the connecting unit plate 1 and a standby position at which the tip is retracted upward to disable punching. The punch control means is switched by a punch control means integrally with the punch holder 27. The punch control means drives the slide cam 33 against a cam surface on the upper surface of the punch holder 27 by driving a cylinder, an electromagnet, or the like, as shown in FIG. Switching is performed by means 34 for control.

Outer punch 28 by punch control means
Is operated in such a manner that the intermittent feeding according to the number of the divided pieces 3 is first performed at the standby position, and then the switching to the punching position is performed so that the connecting unit plate 1 is punched. In the case of removing the outer shape, since the number of the divided pieces 3 is 6, the unit is switched to the punching position every six times and
Punching is performed for the number of times corresponding to the number of stacked layers.

In the step (3), the outer shape punch 28
Each of the connection unit plates 1 punched out in the step (1) is sequentially drawn into the outer shape cutting die 29, and the inner diameter of the squeeze ring 31 continuing below the outer shape cutting die 29 is slightly smaller than the outer diameter of the connecting unit plate 1. The squeeze ring 31 is used for caulking connection between the vertically adjacent connecting unit plates 1.

That is, as shown in FIG. 6, the connection unit plate 1 pulled out first stands by while being supported by the inner diameter of the squeeze ring 31, and the connection unit plate 1 pulled out later is placed thereon. When pushed in, the protrusions 5a of the caulking protrusions 5 are formed.
Is pressed into the recess 5b in a fitted state, and the two are caulked.

After the required number of sheets are punched into the unit laminate 2 and the connecting unit plate 1 provided with the measuring holes 9 instead of the caulking projections 5 is pushed in, the connecting units vertically adjacent to each other are pressed. The plates 1 are separated from each other, and the unit laminates 2 that have been crimped together in a stacked state are sequentially extruded from the inside of the squeeze ring 31, and are transported to the next step by a carry-out belt conveyor 35 arranged below the squeeze ring 31.

In the above-described embodiment, the case where one connecting unit plate 1 is punched from the strip-shaped steel plate 6 in a state where one connection unit plate 1 is punched (in a row in a row with respect to the width of the strip-shaped steel plate 6) is described. As shown in the layout of the punching process at ９9, it is also possible to perform the punching process in a state where two connecting unit plates 1 are taken (two columns are formed in a row with respect to the width of the strip-shaped steel plate 6).

In the punching process shown in FIG. 7, a step of punching a pilot hole 8 for intermittently feeding the strip-shaped steel sheet 6 and a first step of punching a measuring hole 9 for manufacturing a product (unit laminated body 2) from the strip-shaped steel sheet 6 ( 1) and a second step (2) of punching the caulking projection 5 as a caulking coupling means,
In the third step (3), an outer shape punching step (3-1, 3-2) for punching in tandem is separately arranged in the front row and the rear row in the front and rear rows in the width direction. The connecting unit plates 1A and 1B are punched alternately.

In the punching process shown in FIG. 8, all of the first step (1) to the third step (3) of the step of punching the pilot hole 8 and the step of punching the product are performed in two rows in the width direction of the strip-shaped steel plate 6. And the punching process of the pilot hole 8 on the front row side and each process 1-1, 2-1 and 3-
1 and the steps of punching the pilot holes 8 on the rear row side and the respective steps 1-2, 2-2, and 3-2 are alternately performed to punch the connection unit plates 1A and 1B alternately.

In the punching process shown in FIG. 9, only the first step (1) of the weighing punching process is performed simultaneously in the front row and the rear row, and the other steps are individually arranged in the front and rear rows as in FIG. The pilot hole 8 on the front row every cycle.
The punching process and each of the processes 2-1 and 3-1 and the punching process of the pilot hole 8 on the rear row side and each of the processes 2-2 and 3-2 are alternately performed to punch the connecting unit plates 1A and 1B alternately. I do.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a unit laminated body for an annular laminated core according to the present invention, in which (a) is a perspective view of a unit laminated body 2 and (b) is a perspective view of an annular laminated core 4;

FIG. 2 is a layout of a punching process for carrying out the method of manufacturing a unit laminated body according to the present invention, showing a first embodiment in which a strip-shaped steel plate is punched in tandem in a single-piece state.

FIG. 3 is a vertical sectional view of a main part of a progressive die, which is a manufacturing apparatus for performing the method of manufacturing a unit laminate according to the present invention.

FIG. 4 is a partial explanatory view of the progressive die of FIG. 3, showing a schematic longitudinal sectional view for explaining a punch switching mechanism in a measuring hole punching step.

FIG. 5 is a partial explanatory view of the progressive die of FIG. 3, showing a schematic longitudinal sectional view for explaining a punch switching mechanism in an outer shape punching and laminating step.

FIG. 6 is a partial explanatory view of the progressive die of FIG. 3, showing a schematic longitudinal sectional view for explaining the caulking connection of each connection unit plate in the outer shape punching and laminating step.

FIG. 7 is a layout of a punching step for carrying out the method of manufacturing a unit laminated body according to the present invention, showing a second embodiment in which two strips of a strip-shaped steel plate are cascaded.

FIG. 8 is a layout of a punching step for carrying out the method of manufacturing a unit laminated body according to the present invention, showing a third embodiment in which two strips of a strip-shaped steel plate are tandemly punched.

FIG. 9 is a layout of a punching step for carrying out the method of manufacturing a unit laminated body according to the present invention, showing a fourth embodiment in which two strips of a strip-shaped steel plate are cascaded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection unit plate 2 Unit laminated body 3 Divided piece 4 Annular iron core 5 Caulking protrusion (caulking coupling means) 6 Strip steel plate 7 Progressive die 7A Upper die 7B Lower die 8 Pilot hole 9 Measuring hole 10 Upper die holder 11 Upper die backing Plate 12 Punch Plate 13 Stripper Holder 14 Stripper Plate 15 Lower Die Holder 16 Die Plate 17 Material Guide 18 Material Receiving Plate 19 Pilot Punch Punch 20 Measuring Punch 21 Slide Cam 22 Cut-Up Punch 23 Pilot Punch Die 24 Measuring Die 25 Cut-Up Die 26 Driving means (for switching the measuring punch) 27 Punch holder 28 External punching punch 29 External punching die 30 Squeeze ring holder 31 Squeeze ring 32 Push-in pin 33 Slide cam (for external punch punch switching) 34 Driving means (for switching punching outside shape) 35 Conveyor belt conveyor

Claims (5)

[Claims] 1. A connecting unit plate in which a predetermined number of divided pieces are connected in a shape in which one annular laminated core is developed is formed into a predetermined stacking thickness from a long strip-shaped steel plate intermittently fed using a progressive die. A method of manufacturing a unit laminated body in which punching is performed sequentially by the number of sheets and interconnected and laminated via caulking coupling means, wherein in the outer shape punching and laminating step using the progressive die, the connecting unit plate is formed in a belt shape. A method for producing a unit laminated body for an annular laminated iron core, comprising punching a steel sheet in tandem along a feed direction. 2. The punching process of the connection unit plate is performed in a line along the feeding direction of the strip-shaped steel sheet in the order of a pilot hole punching step, a measuring hole punching step, a caulking coupling means forming step, and an outer shape punching and laminating step. The method for producing a unit laminated body for an annular laminated core according to claim 1, wherein the method is performed by each punch and each die of the progressive die arranged in a line. 3. The punching process of the connecting unit plate is performed in the order of a pilot hole punching process, a measuring hole punching process, and a caulking coupling means forming process in the order of two rows in front and rear along the feeding direction of the strip-shaped steel plate. After being carried out by each punch and each die of the progressive die, it is arranged along the feeding direction of the strip-shaped steel sheet in the order of one outer punching and laminating step of the front row or the rear row, and the other outer punching and laminating step of the front row or the rear row. The method for manufacturing a unit laminated body for an annular laminated core according to claim 1, wherein the method is performed by each of the punches and each die of the progressive die. 4. The punching process of the connecting unit plate includes a pilot hole punching process, a measuring hole punching process, a caulking connecting means forming process, and an outer shape punching and laminating process in the order of the front row or the rear row along the feeding direction of the strip-shaped steel sheet. After being carried out by each punch and each die of the progressive die arranged on one side, a pilot hole punching step, a measuring hole punching step, a caulking coupling means forming step, and an outer shape punching and laminating step are performed in the order of: The method for manufacturing a unit laminated body for an annular laminated core according to claim 1, wherein the method is performed by each punch and each die of the progressive die arranged in the other of the front row and the rear row along the feeding direction. 5. The punching process of the connecting unit plates is performed in a sequence of a pilot hole punching process, a caulking connecting means forming process, and an outer shape punching and laminating process, and is arranged in one of a front row and a rear row along a feeding direction of the strip-shaped steel sheet. It is performed by each punch and each die of the progressive die and each punch and each die of the measuring hole punching process arranged in both the front row and the rear row between the pilot hole punching step and the caulking coupling means forming step. After the pilot hole punching process,
2. The method according to claim 1, wherein the steps are performed by a punch and a die of the progressive die arranged in the front row or the rear row along the feeding direction of the strip-shaped steel sheet in the order of the caulking coupling means forming step and the outer shape punching and laminating step. 3. A method for producing the described unit laminated body for an annular laminated core.