CN118159372A - Jumping die device and manufacturing method of laminated iron core - Google Patents

Abstract

The jump die device comprises an upper die, a lower die, a lifter and a pressing member. The upper die and the lower die press the strip-shaped metal plate sequentially conveyed in a predetermined direction. The lifter is provided in the lower die and lifts up the metal plate while sequentially conveying the metal plate. The pressing member is provided in the upper die and presses the metal plate from above when the lifter lifts the metal plate.

Description

Jumping die device and manufacturing method of laminated iron core

Technical Field

Embodiments of the present disclosure relate to a skip die apparatus and a method of manufacturing a laminated core.

Background

The laminated core constituting the stator or rotor of the motor is manufactured, for example, by sequentially feeding a strip-shaped metal plate to a die device, sequentially punching the metal plate at processing stations arranged in the direction of feeding the metal plate to form core pieces of a desired shape, and laminating the obtained core pieces.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2003-200296

Disclosure of Invention

First, the technical problem to be solved

On the other hand, in the manufacturing process of the laminated core, the rigidity of the metal plates gradually decreases as the core pieces are sequentially punched out from the wide metal plates. Therefore, in the skip die device shown in patent document 1, the metal plate is liable to shake up and down as it goes to the downstream processing station. Due to the shaking, the metal plate is easily caught in the mold device. As a result, there is a possibility that defects such as a shortage of the sequential conveyance movement amount and deformation of the metal plate may occur.

An object of one embodiment is to provide a skip die device capable of suppressing the wobbling of a metal plate in a die device, and a method for manufacturing a laminated core.

(II) technical scheme

The skip die device according to one embodiment includes: upper and lower molds, a lifter, and a pressing member. The upper die and the lower die press the strip-shaped metal plate sequentially conveyed in a predetermined direction. The lifter is provided in the lower die and lifts the metal plate while sequentially conveying the metal plate. The pressing member is provided on the upper die and presses the metal plate from above when the lifter lifts the metal plate.

The method for manufacturing a laminated core according to an embodiment includes: a press working procedure, a lifting procedure and a pressing procedure. The press working step performs press working on the strip-shaped metal plate sequentially conveyed in a predetermined direction by using an upper die and a lower die. And a lifting step of lifting the metal plate by a lifter provided in the lower die when the metal plate is sequentially conveyed. And a pressing step of pressing the metal plate from above by a pressing member provided in the upper die when the metal plate is lifted by the lifter.

(III) beneficial effects

According to one aspect of the embodiment, the metal plate can be prevented from rocking in the die device.

Drawings

Fig. 1 is a schematic diagram illustrating an example of a laminated core manufacturing apparatus according to an embodiment.

Fig. 2 is a perspective view showing an example of the laminated core according to the embodiment.

Fig. 3A is a plan view showing an example of an electromagnetic steel sheet subjected to punching by the press working apparatus according to the embodiment.

Fig. 3B is a plan view showing an example of the lower die of the embodiment.

Fig. 4A is a cross-sectional view showing an example of the lifter according to the embodiment.

Fig. 4B is a cross-sectional view showing an example of the guide according to the embodiment.

Fig. 5A is a plan view showing an example of the upper die according to the embodiment.

Fig. 5B is a cross-sectional view showing an example of the pressing member according to the embodiment.

Fig. 6 is a flowchart showing an example of the process of each manufacturing process performed by the press working apparatus according to the embodiment.

Fig. 7A is a diagram for explaining an example of a manufacturing process of the laminated core according to the embodiment.

Fig. 7B is a diagram for explaining an example of a manufacturing process of the laminated core according to the embodiment.

Fig. 8A is a diagram for explaining an example of a manufacturing process of the laminated core according to the embodiment.

Fig. 8B is a diagram for explaining an example of a manufacturing process of the laminated core according to the embodiment.

Fig. 9 is a diagram for explaining an example of a process for manufacturing a laminated core according to a modification.

Detailed Description

The jump die apparatus and the method for manufacturing the laminated core according to the present application will be described below with reference to the accompanying drawings. The present disclosure is not limited to the embodiments described below.

The drawings are schematic, and the relationship between the dimensions of the elements, the ratio of the elements, and the like may be different from reality. In addition, the drawings may include portions having different dimensional relationships and ratios.

The laminated core constituting the stator and the rotor of the motor is manufactured by, for example, sequentially feeding a strip-shaped metal plate to a die device, sequentially punching the metal plate at processing stations arranged in the feeding direction of the metal plate to form core pieces of a desired shape, and laminating the obtained core pieces.

In this case, the following techniques are known: in order to prevent a part of the metal plate during blanking from sagging during sequential conveyance, interference with a lower die of the die device occurs, and the metal plate is lifted from the lower die by a lifter provided in the lower die and sequentially conveyed.

On the other hand, in the manufacturing process of the laminated core, the rigidity of the metal plates gradually decreases as the core pieces are sequentially punched out from the wide metal plates. Therefore, in the skip die device shown in patent document 1, the metal plate is liable to shake up and down with the downstream processing station, and the metal plate is liable to be caught in the die device due to the shake.

This rattling occurs significantly when the metal plate is lifted from the lower die by the lifter, for example. Further, since the metal plate is stuck in the die apparatus, there is a possibility that defects such as a shortage of the sequential conveyance movement amount, deformation of the metal plate, and the like may occur. In particular, the metal plates used as the material of the laminated core are further thinned according to the demand for the high efficiency of the motor, and are liable to be wobbled.

Therefore, it is desired to realize a technique capable of suppressing the wobbling of the metal plate in the mold device.

< Manufacturing device >

First, a laminated core manufacturing apparatus 100 according to an embodiment will be described with reference to fig. 1. Fig. 1 is a schematic diagram illustrating an example of a laminated core manufacturing apparatus 100 according to an embodiment. The manufacturing apparatus 100 according to the embodiment is configured to manufacture a laminate of iron core pieces from a strip-shaped electromagnetic steel sheet MS.

In the drawings referred to below, for the sake of easy understanding of the description, an orthogonal coordinate system defining an X-axis direction, a Y-axis direction, and a Z-axis direction orthogonal to each other, a Z-axis positive direction being a vertically upward direction, an X-axis positive direction being a sequential conveyance direction of the electromagnetic steel sheet MS, and a Y-axis being a width direction of the electromagnetic steel sheet MS may be shown.

As shown in fig. 1, the manufacturing apparatus 100 includes: the uncoiler 110, the feed-out device 120, the press working device 130, and the controller Ctr (control unit). The press working apparatus 130 is an example of a skip die apparatus.

The unwinder 110 rotatably holds a coil 111. The coil 111 is formed by winding an electromagnetic steel sheet MS in a coil shape (spiral shape). The electromagnetic steel sheet MS is an example of a metal sheet.

The feeding device 120 includes a pair of rollers 121 and 122 for sandwiching the electromagnetic steel sheet MS from above and below. The pair of rollers 121 and 122 are configured to rotate and stop based on an instruction signal from the controller Ctr, and intermittently and sequentially feed the electromagnetic steel sheet MS toward the press working apparatus 130 (hereinafter, also referred to as "sequential feeding"). That is, the pair of rollers 121, 122 has a function as a conveying unit for conveying the electromagnetic steel sheet MS.

The press working apparatus 130 is configured to operate based on an instruction signal from the controller Ctr. The press working apparatus 130 sequentially performs press working (for example, blanking, half blanking, etc.) on the electromagnetic steel sheet MS fed by the feeding-out apparatus 120 by operating a plurality of punches (not shown), for example.

Thus, the press working apparatus 130 is configured to form a plurality of punching members W (see fig. 2). The press working apparatus 130 may be configured to sequentially laminate a plurality of punched members W obtained by punching to form a laminate.

The press working apparatus 130 includes: lower die 140, upper die 150, and punch 160. The lower die 140 is located below the sequentially conveyed electromagnetic steel sheet MS, and supports the electromagnetic steel sheet MS from below. The upper die 150 is located above the sequentially conveyed electromagnetic steel sheet MS, and performs press working on the electromagnetic steel sheet MS by moving up and down. Details of the lower mold 140 and the upper mold 150 will be described later.

The punching machine 160 is located above the upper die 150. The piston of the press machine 160 is connected to a punch holder (not shown) that holds a plurality of punches provided in the upper die 150, and operates based on an instruction signal from the controller Ctr. When the press machine 160 is operated, the piston thereof expands and contracts, and the upper die 150 moves up and down as a whole.

The controller Ctr is configured to generate instruction signals for operating the feed device 120 and the press working device 130 based on, for example, a program recorded on a recording medium (not shown) or an operation input from an operator. The controller Ctr is configured to transmit the instruction signal to the feed-out device 120 and the press working device 130, respectively.

< Laminated iron core >)

Next, the structure of the laminated core 1 according to the embodiment will be described with reference to fig. 2. Fig. 2 is a perspective view showing an example of the laminated core 1 according to the embodiment. The laminated core 1 is, for example, a stator laminated core, and is a part of a stator (stators).

The stator is formed by mounting windings on the laminated core 1. A motor is constituted by combining a rotor with the stator.

As shown in fig. 2, the laminated core 1 has a cylindrical shape. That is, a through hole 1a (center hole) extending along the center axis Ax is provided in the center portion of the laminated core 1. A rotor can be disposed in the through hole 1 a.

The laminated core 1 is a laminate in which a plurality of punched members W are laminated. The punching member W is a plate-like body obtained by punching a strip-like electromagnetic steel sheet MS (see fig. 1) into a predetermined shape.

Further, the laminated core 1 of the embodiment may be constituted by so-called rotary lamination. The term "rotational lamination" refers to lamination of a plurality of punching members W while shifting the punching members W relative to each other in angle. The rotational lamination is mainly performed for the purpose of canceling out the plate thickness deviation of the laminated core 1. The angle of the rotational lamination can be set to an arbitrary size.

The laminated core 1 includes: yoke 2, teeth 3, and rivets 4. The yoke 2 is annular and extends so as to surround the central axis Ax. The width, inner diameter, outer diameter, and thickness of the yoke 2 in the radial direction can be set to various sizes according to the use and performance of the motor.

Each tooth 3 extends in the radial direction of the yoke 2 from the inner edge of the yoke 2 toward the central axis Ax side. That is, each tooth 3 protrudes from the inner edge of the yoke 2 toward the center axis Ax side.

For example, in the example of fig. 2, 12 teeth 3 are formed integrally with the yoke 2. The teeth 3 are arranged at substantially equal intervals in the circumferential direction of the yoke 2. Slots 5 functioning as spaces for disposing windings (not shown) are partitioned between adjacent tooth portions 3.

The caulking portion 4 may be provided to the yoke 2, each of the teeth 3, or both the yoke 2 and each of the teeth 3. The blanking members W adjacent to each other in the height direction are fastened to each other by the caulking portions 4.

Specifically, the caulking portion 4 includes: a caulking material (not shown) formed in the punching member W constituting the portion other than the lowermost layer of the laminated core 1, and a through hole (not shown) formed in the punching member W constituting the lowermost layer of the laminated core 1.

The protruding portion of the caulking material is engaged with the recessed portion or the through hole of the adjacent other caulking material. The through hole has the following functions: when continuously manufacturing the laminated core 1, the blanking member W formed next is prevented from being fastened to the laminated core 1 that has been manufactured by caulking.

In the laminated core 1 according to the embodiment, the plurality of punching members W may be fastened to each other by various known methods instead of the caulking portion 4. For example, the plurality of punching members W may be joined to each other by using an adhesive or a resin material, or may be joined to each other by welding.

Alternatively, a temporary caulking may be provided to the punching member W, and after a laminate is obtained by fastening and connecting a plurality of punching members W via the temporary caulking, the temporary caulking may be removed from the laminate to obtain the laminated core 1. Further, the "temporary caulking" refers to caulking for temporarily integrating the plurality of blanking members W and being removed in the process of manufacturing the product (laminated core 1 or stator).

< Press working apparatus >

Next, a description will be given of details of the press working apparatus 130 according to the embodiment with reference to fig. 3A to 5B. Fig. 3A is a plan view showing an example of an electromagnetic steel sheet MS punched by the press working apparatus 130 according to the embodiment.

In fig. 3A, 3B and 5A below, for convenience of understanding, an electromagnetic steel sheet MS (see fig. 3A), a lower die 140 (see fig. 3B) and an upper die 150 (see fig. 5A) corresponding to the last part of the punching process are shown.

The portion shown by black in fig. 3A is a portion subjected to punching before reaching the stations Sa, sb. That is, as shown in fig. 3A, when the electromagnetic steel sheet MS of the embodiment reaches the station Sa where the punching process is performed, the portions other than the through hole 1a (see fig. 2) are already punched.

The electromagnetic steel sheet MS is provided with guide holes H by punching at both edge portions at a station on an upstream side not shown. The guide holes H are formed to position the electromagnetic steel sheet MS by guide pins 152 (see fig. 5A) at the time of punching the electromagnetic steel sheet MS by a punch at each station provided in the press working apparatus 130.

Then, the press working apparatus 130 (see fig. 1) punches out a portion Sa1 corresponding to the through hole 1a at the station Sa. In fig. 3A, the dot-shaped hatched portions Sa1 and Sb1 are portions to be punched at the stations Sa and Sb, respectively.

Next, the press working apparatus 130 punches out a portion Sb1 corresponding to the entire punched member W from the electromagnetic steel sheet MS sequentially conveyed in the predetermined direction D from the station Sa to the station Sb. Thus, in the press working apparatus 130, one punching member W is formed.

Fig. 3B is a plan view showing an example of the lower die 140 according to the embodiment. As shown in fig. 3B, the lower die 140 of the embodiment includes: template 141, guide hole 142, lifter 143, and guide 144. In the lower die 140, a die hole Sa2 is formed at the station Sa, and a die hole Sb2 is formed at the station Sb.

The die plate 141 has a function of forming the blanking member W together with a plurality of punches provided in the upper die 150. The die plate 141 is supported by a base (not shown) and a die holder 145 (see fig. 4A), for example.

The guide hole 142 is provided so as to extend in the vertical direction, and is formed in the die plate 141, for example. The guide hole 142 is a reference hole for positioning the electromagnetic steel sheet MS by the guide pin 152 (see fig. 5A) when punching the electromagnetic steel sheet MS by a punch.

When the electromagnetic steel sheet MS is sequentially conveyed, the lifter 143 lifts the electromagnetic steel sheet MS from the upper surface 141a (see fig. 4A) of the template 141. A plurality of lifters 143 are provided in the lower die 140 at positions where the electromagnetic steel sheet MS passes. The arrangement of the lifters 143 is not particularly limited, but in the present disclosure, is provided at least at a position where the widthwise central portion of the electromagnetic steel sheet MS passes.

Fig. 4A is a cross-sectional view showing an example of the lifter 143 according to the embodiment. As shown in fig. 4A, the lifter 143 has a pin portion 143a and an elastic member 143b.

In addition, in the lifter 143, when the electromagnetic steel sheet MS is punched by lowering the upper die 150 (see fig. 1), the elastic member 143b is contracted downward, so that the tip end portion of the pin portion 143a can be made to have a height substantially equal to the upper surface 141a of the die plate 141 in the vertical direction.

Thus, the electromagnetic steel sheet MS can be pressed against the upper surface 141a of the die plate 141 during the punching process.

On the other hand, when the electromagnetic steel sheet MS is sequentially conveyed, the elastic member 143b extends upward, and the distal end portion of the pin portion 143a can support the electromagnetic steel sheet MS in a state separated from the upper surface 141a of the die plate 141 in the vertical direction.

This can prevent a part of the electromagnetic steel sheet MS during blanking from sagging during sequential conveyance and interfering with the lower die 140.

Further, a tapered portion 143a1 is provided at the tip end portion of the pin portion 143a on the side opposite to the direction D of sequential conveyance. Since the tapered portion 143a1 is provided in the pin portion 143a, the electromagnetic steel sheet MS can be restrained from being caught by the pin portion 143a when the electromagnetic steel sheet MS is sequentially conveyed. The structure of the lifter 143 is not limited to the example of fig. 4A.

The description returns to fig. 3B. The guides 144 are provided near both edges of the sequentially conveyed electromagnetic steel sheet MS, and restrict the displacement of the electromagnetic steel sheet MS in the Y-axis direction during the sequential conveyance. That is, the guides 144 support both edge portions of the electromagnetic steel sheet MS, and guide the electromagnetic steel sheet MS in the direction D in which the electromagnetic steel sheet MS is sequentially conveyed.

Fig. 4B is a cross-sectional view showing an example of the guide 144 according to the embodiment. As shown in fig. 4B, the guide 144 has: a restricting portion 144a, a lifting portion 144b, and an elastic member 144c (see fig. 7A). The restricting portion 144a includes a first restricting portion 144a1 and a second restricting portion 144a2.

The first regulating portion 144a1 is located at a position laterally adjacent to the edge of the electromagnetic steel sheet MS, and regulates the displacement of the electromagnetic steel sheet MS in the Y-axis direction. The second regulating portion 144a2 is located above the edge portion of the electromagnetic steel sheet MS, and regulates the edge portion of the electromagnetic steel sheet MS from excessively rising in the vertical direction.

When the lifting portion 144b is lowered by the upper die 150 (see fig. 1) and the electromagnetic steel sheet MS is punched, the elastic member 144c is contracted downward, so that the front end portion of the lifting portion 144b can be at a height substantially equal to the upper surface 141a of the die plate 141 in the vertical direction.

Thus, the electromagnetic steel sheet MS can be pressed against the upper surface 141a of the die plate 141 during the punching process.

On the other hand, when the electromagnetic steel sheet MS is sequentially conveyed, the elastic member 144c is extended upward, so that the distal end portion of the lifting portion 144b can support the electromagnetic steel sheet MS in a state separated from the upper surface 141a of the die plate 141 in the vertical direction.

This can prevent a part of the electromagnetic steel sheet MS during blanking from sagging during sequential conveyance and interfering with the lower die 140. In this way, in the embodiment, the lifting portion 144b of the guide 144 moves up and down in conjunction with the pin portion 143a of the lifter 143.

The description returns to fig. 3B. The die holes Sa2 and Sb2 are provided so as to extend in the vertical direction, and are formed in the die plate 141 and the die holder 145, for example. The punch holes Sa2, sb2 are provided at positions corresponding to the punches Sa3, sb3 (see fig. 5A) provided in the upper die 150, respectively. In the die holes Sa2, sb2, core pieces (for example, punching members W and the like) punched out of the electromagnetic steel sheet MS by the punches Sa3, sb3 pass.

Fig. 5A is a plan view showing an example of the upper die 150 according to the embodiment, and is a view of the upper die 150 from below. In addition, a guide 144 of the corresponding lower die 140 is also illustrated in fig. 5A.

As shown in fig. 5A, the upper die 150 of the embodiment includes: a stripper 151, a guide pin 152, and a pressing member 153. In the upper die 150, a punch Sa3 is provided at a station Sa, and a punch Sb3 is provided at a station Sb.

The ejector 151 has: a function of sandwiching the electromagnetic steel sheet MS between the die plate 141 (fig. 3B) when the electromagnetic steel sheet MS is blanked by a plurality of punches provided to the upper die 150; and a function of removing the electromagnetic steel sheet MS biting the punch from the punch after the blanking process.

The ejector 151 is supported so as to be movable up and down with respect to a punch holder (not shown) located above the ejector 151, for example.

The guide pins 152 are inserted into guide holes H formed in the electromagnetic steel sheet MS at the time of punching the electromagnetic steel sheet MS, thereby positioning the electromagnetic steel sheet MS at a desired position. The guide pin 152 is supported by a punch holder located above the ejector 151, for example.

When the electromagnetic steel sheet MS is lifted by the lifter 143, the pressing member 153 presses the electromagnetic steel sheet MS from above. The pressing member 153 has, for example, a pin shape, and a plurality of pressing members are provided in the upper die 150 at positions where the electromagnetic steel sheet MS passes. The arrangement of the pressing member 153 is not particularly limited, and in the present disclosure, for example, is provided at a position facing each of the plurality of lifters 143 provided in the lower die 140. The pressing member 153 is not limited to the pin shape.

Fig. 5B is a cross-sectional view showing an example of the pressing member 153 according to the embodiment. As shown in fig. 5B, the pressing member 153 has a pin portion 153a and an elastic member 153B.

In addition, when the pressing member 153 performs punching processing on the electromagnetic steel sheet MS by lowering the upper die 150, the elastic member 153b contracts upward, and the front end 153a1 of the pin portion 153a can be made to have a height substantially equal to the lower surface 151a of the ejector 151 in the vertical direction.

Thus, the electromagnetic steel sheet MS can be pressed against the lower surface 151a of the ejector 151 during the punching process.

On the other hand, when the upper die 150 is retracted upward during the sequential conveyance of the electromagnetic steel sheet MS, the pin 153a can push the electromagnetic steel sheet MS downward in a state separated from the lower surface 151a of the ejector 151 by the elastic member 153b being extended downward. The structure of the pressing member 153 is not limited to the example of fig. 5B.

The description of fig. 5A is returned. The punches Sa3 and Sb3 have a function of performing punching at predetermined positions with respect to the electromagnetic steel sheet MS located at the stations Sa and Sb. The punches Sa3, sb3 have slightly smaller dimensions than the die holes Sa2, sb2, respectively. The punches Sa3 and Sb3 are provided at positions where the punch holes Sa2 and Sb2 can be inserted, respectively. The punches Sa3, sb3 are supported by, for example, a punch holder located above the ejector 151.

< Manufacturing Process >)

Next, a process for manufacturing the laminated core 1 in the press working apparatus 130 according to the embodiment will be described with reference to fig. 6 to 8B. Fig. 6 is a flowchart showing an example of the process of each manufacturing process performed by the press working apparatus 130 according to the embodiment. Fig. 7A to 8B are diagrams for explaining an example of a manufacturing process of the laminated core 1 according to the embodiment.

As shown in fig. 6, the controller Ctr (see fig. 1) first controls the feeding device 120 (see fig. 1) and the like to sequentially convey the electromagnetic steel sheet MS (see fig. 1) in the direction D (see fig. 1) in the press working device 130 (see fig. 1) (step S101).

Next, the controller Ctr controls the press working apparatus 130 to lower the upper die 150, and clamps the electromagnetic steel sheet MS by the upper die 150 and the lower die 140, thereby performing press working on the electromagnetic steel sheet MS (step S102).

Specifically, as shown in fig. 7A, when punching such as blanking is performed on the electromagnetic steel sheet MS, the electromagnetic steel sheet MS is held between the die plate 141 of the lower die 140 and the stripper 151 of the upper die 150.

That is, in blanking the electromagnetic steel sheet MS, the lower surface of the electromagnetic steel sheet MS is in contact with the upper surface 141a of the die plate 141, and the upper surface of the electromagnetic steel sheet MS is in contact with the lower surface 151a of the ejector 151.

At this time, the upper surface 141a of the die plate 141 and the tip end portion of the pin portion 143a of the lifter 143 and the tip end portion of the lifter portion 144b of the guide 144 have substantially the same height in the vertical direction. At this time, the lower surface 151a of the ejector 151 and the tip 153a1 (see fig. 5B) of the pin 153a of the pressing member 153 have substantially the same height in the vertical direction.

In the press working apparatus 130, after punching the electromagnetic steel sheet MS, it is necessary to release the state in which the electromagnetic steel sheet MS is held between the die plate 141 and the stripper 151 in order to sequentially convey the electromagnetic steel sheet MS.

Therefore, as shown in fig. 6, after the processing of step S102, the controller Ctr controls the press working apparatus 130 to raise the upper die 150 and operate the lifter 143 and the like, thereby lifting the electromagnetic steel sheet MS from the lower die 140 (step S103).

Specifically, as shown in fig. 7B, the controller Ctr (see fig. 1) operates the press machine 160 (see fig. 1) and gradually moves the upper die 150 upward.

Then, the lifter 143 starts to lift the electromagnetic steel sheet MS by the elastic force of the elastic member 143b, and separates the electromagnetic steel sheet MS from the upper surface 141a of the template 141. In the same manner, the lifting portion 144b of the guide 144 starts to lift the electromagnetic steel sheet MS by the elastic force of the elastic member 144c, and separates the electromagnetic steel sheet MS from the upper surface 141a of the die plate 141.

Further, at the time of starting lifting of the electromagnetic steel sheet MS by the lifter 143 or the like, as shown in fig. 7B, the electromagnetic steel sheet MS is in contact with the lower surface 151a of the ejector 151. This is because the elastic force of the elastic member 153b of the pressing member 153 is set smaller than the elastic force of the elastic member 143b of the lifter 143.

As shown in fig. 8A, the controller Ctr further operates the press machine 160 to further move the upper die 150 upward. Then, the lifter 143 and the lifter portion 144b of the guide 144 are lifted up to a predetermined lifting position (a position where they come into contact with the second regulating portion 144a2 of the regulating portion 144 a) for sequentially conveying the electromagnetic steel sheet MS by the elastic force of the elastic members 143b, 144 c. In addition, at this time, the electromagnetic steel sheet MS is separated from the lower surface 151a of the ejector 151.

In parallel with the process of step S103 in fig. 6 described above, the controller Ctr raises the upper die 150 and causes the pressing member 153 to protrude from the upper die 150, thereby pressing the electromagnetic steel sheet MS from above (step S104).

Specifically, as shown in fig. 8A, the electromagnetic steel sheet MS is pressed from above by the pressing member 153 provided in the upper die 150 while the electromagnetic steel sheet MS is lifted to a predetermined lifting position by the lifter 143 or the like.

Accordingly, the upward sway of the electromagnetic steel sheet MS can be suppressed by the inertial force generated upward in the electromagnetic steel sheet MS by being lifted to the predetermined lifting position. That is, in the embodiment, by providing the pressing member 153 in the upper die 150, the vibration of the electromagnetic steel sheet MS in the press working apparatus 130 can be suppressed.

In the embodiment, the pressing member 153 presses the widthwise central portion of the electromagnetic steel sheet MS. As described above, by pressing the widthwise central portion of the electromagnetic steel sheet MS, which is most likely to generate rattle, by the pressing member 153, rattle of the electromagnetic steel sheet MS in the press working apparatus 130 can be further suppressed.

In the embodiment, the pressing member 153 is provided at a position facing the lifter 143. As a result, the portion of the electromagnetic steel sheet MS that is easily biased upward by the lifter 143, which is in contact with the lifter 143, can be directly pressed by the pressing member 153.

Therefore, according to the embodiment, the vibration of the electromagnetic steel sheet MS in the press working apparatus 130 can be further suppressed.

In the above-described embodiment, the example in which at least one of the plurality of pressing members 153 presses the widthwise central portion of the electromagnetic steel sheet MS has been shown, but the present disclosure is not limited to this example, and all the pressing members 153 may press portions other than the widthwise central portion of the electromagnetic steel sheet MS.

In the above-described embodiment, the example in which all the pressing members 153 are provided at the positions facing the lifters 143 has been described, but the present disclosure is not limited to this example, and some or all of the pressing members 153 may be provided at positions not facing the lifters 143.

In this case, the pressing member 153 may be disposed at a position close to the lifter 143. As a result, the vicinity of the portion of the electromagnetic steel sheet MS that is easily biased upward by the lifter 143 and in contact with the lifter 143 can be pressed by the pressing member 153, and therefore, the electromagnetic steel sheet MS can be further prevented from rocking in the press working apparatus 130.

The description of fig. 6 is returned. After the processing in step S103 and step S104 is completed, the controller Ctr controls the press working apparatus 130 to separate the upper die 150 from the electrical steel sheet MS after the electrical steel sheet MS is lifted to a predetermined lifting position (step S105).

Specifically, as shown in fig. 8B, after the electromagnetic steel sheet MS is lifted to a predetermined lifting position by the lifter 143 or the like, the controller Ctr further operates the press machine 160 to further move the upper die 150 upward.

Thereby, the pressing member 153 is separated from the upper surface of the electromagnetic steel sheet MS. Although not shown in fig. 8B, the guide pins 152 (see fig. 5A) provided in the upper die 150 also rise and are separated from the guide holes H (see fig. 3A) of the electromagnetic steel sheet MS.

Accordingly, the electromagnetic steel sheet MS is not bound by the upper die 150, and the electromagnetic steel sheet MS can be sequentially conveyed. As shown in fig. 6, the controller Ctr operates the feeding device 120 and the like, and sequentially conveys the electromagnetic steel sheet MS in the direction D for a predetermined distance (step S106).

Next, the controller Ctr determines whether or not the press working process of the electromagnetic steel sheet MS is finished (step S107). When the press working process of the electromagnetic steel sheet MS is completed (yes in step S107), a series of manufacturing processes are completed. On the other hand, when the press working process of the electrical steel sheet MS is not completed (no in step S107), the process returns to the process of step S102.

Specifically, the controller Ctr operates the press machine 160 to move the upper die 150 downward. Thereby, the guide pin 152 is inserted into the guide hole H of the electromagnetic steel sheet MS, and the electromagnetic steel sheet MS is positioned at a predetermined position.

The controller Ctr further operates the press machine 160 to move the upper die 150 downward. Thereby, the ejector 151 and the pressing member 153 of the upper die 150 are in contact with the electromagnetic steel sheet MS, and the electromagnetic steel sheet MS is sandwiched between the die plate 141 of the lower die 140 and the ejector 151 of the upper die 150.

In this state, the controller Ctr operates the press machine 160, and performs punching processing on the electromagnetic steel sheet MS by a plurality of punches provided in the upper die 150. Then, the state shown in fig. 7A is returned.

In the embodiment, the tip 153a1 of the pressing member 153 may be located above the tip of the guide pin 152 in the upper die 150. Thus, when the electromagnetic steel sheet MS is positioned by the guide pin 152, the pressing member 153 can be prevented from coming into contact with the electromagnetic steel sheet MS.

Therefore, when the electromagnetic steel sheet MS is positioned by the guide pin 152, the movement of the electromagnetic steel sheet MS in the horizontal direction can be suppressed from being restricted by the pressing member 153. Therefore, according to the embodiment, the positioning of the electromagnetic steel sheet MS by the guide pin 152 can be smoothly performed.

< Modification >

Next, a modified example of the manufacturing process of the laminated core 1 and the press working apparatus 130 according to the above embodiment will be described with reference to fig. 9. Fig. 9 is a diagram for explaining an example of a process for manufacturing the laminated core 1 according to the modification.

As shown in fig. 9, the structure of the guide 144 in the press working apparatus 130 according to the modification is different from that of the above-described embodiment. Specifically, the guide 144 of the modification includes a lift restricting portion 144d and an elastic member 144c.

The elevation restricting portion 144d has a substantially U-shape in cross section. The elevation restricting portion 144d supports the edge portion of the electromagnetic steel sheet MS on the inside of the U-shape, and suppresses the displacement of the electromagnetic steel sheet MS in the Y-axis direction and the vertical direction.

The elevation restricting portion 144d is configured to be capable of being elevated by the elastic force of the elastic member 144 c. The guide 144 does not have the restricting portion 144a described in the above embodiment.

Thus, the elevation restricting portion 144d can be raised to a position where the elastic force of the elastic member 144c reaches.

In the modification, the elevation restricting portion 144d has a substantially U-shape in cross section, so that the guide 144 can support the lower surface of the electromagnetic steel sheet MS in surface contact. Therefore, according to the modification, the vibration of the electromagnetic steel sheet MS in the press working apparatus 130 can be further suppressed.

In the press working apparatus 130 according to the modification shown in fig. 9, the manufacturing process of the laminated core 1 is the same as that of the above-described embodiment described with reference to fig. 6 to 8B, and therefore, the description thereof is omitted.

The embodiments of the present disclosure have been described above, but the present disclosure is not limited to the above embodiments, and various modifications can be made without departing from the gist thereof. For example, in the above-described embodiment, the press working apparatus 130 that performs the punching work on the electromagnetic steel sheet MS is shown, but the present disclosure is not limited to this example. For example, the electromagnetic steel sheet MS may be half-punched, or a metal sheet different from the electromagnetic steel sheet MS may be half-punched.

As described above, the jump die apparatus (press working apparatus 130) of the embodiment includes: the upper and lower molds 150 and 140, the lifter 143, and the pressing member 153. The upper die 150 and the lower die 140 press-work a strip-shaped metal plate (electromagnetic steel plate MS) sequentially conveyed in a predetermined direction D. The lifter 143 is provided in the lower die 140, and lifts up the metal plate (electromagnetic steel plate MS) while sequentially conveying the metal plate (electromagnetic steel plate MS). The pressing member 153 is provided on the upper die 150, and the lifter 143 presses the metal plate (electromagnetic steel plate MS) from above when lifting the metal plate (electromagnetic steel plate MS). This can suppress the vibration of the electromagnetic steel sheet MS in the press working apparatus 130.

In the jump die apparatus (press working apparatus 130) of the embodiment, the pressing member 153 presses the widthwise central portion of the metal plate (electromagnetic steel plate MS). This can further suppress the vibration of the electromagnetic steel sheet MS in the press working apparatus 130.

In the jump die apparatus (press working apparatus 130) according to the embodiment, the pressing member 153 is provided at a position facing the lifter 143. This can further suppress the vibration of the electromagnetic steel sheet MS in the press working apparatus 130.

The jump die apparatus (press working apparatus 130) of the embodiment further includes a guide pin 152 provided in the upper die 150 and positioning the metal plate (electromagnetic steel plate MS). The tip 153a1 of the pressing member 153 is located above the tip of the guide pin 152. This makes it possible to smoothly position the electromagnetic steel sheet MS by the guide pin 152.

The skip die device (press working device 130) according to the embodiment further includes: a guide 144 that supports both edges of the metal plate (electromagnetic steel plate MS) and guides the metal plate (electromagnetic steel plate MS) in the direction D of sequential conveyance. In addition, the guide 144 has a substantially U-shape in cross section. This can further suppress the vibration of the electromagnetic steel sheet MS in the press working apparatus 130.

The method for manufacturing the laminated core 1 according to the embodiment includes a press working step (step S102), a lifting step (step S103), and a pressing step (step S104). The press working step (step S102) performs press working on a strip-shaped metal plate (electromagnetic steel plate MS) sequentially conveyed in a predetermined direction D by using the upper die 150 and the lower die 140. In the lifting step (step S103), when the metal plate (electromagnetic steel plate MS) is sequentially conveyed, the metal plate (electromagnetic steel plate MS) is lifted by the lifter 143 provided in the lower die 140. In the pressing step (step S104), when the metal plate (electromagnetic steel plate MS) is lifted up by the lifter 143, the metal plate (electromagnetic steel plate MS) is pressed from above by the pressing member 153 provided in the upper die 150. This can suppress the vibration of the electromagnetic steel sheet MS in the press working apparatus 130.

The method for manufacturing the laminated core 1 according to the embodiment further includes a step of lifting the metal plate (electromagnetic steel plate MS) by the lifter 143 and then separating the pressing member 153 from the metal plate (electromagnetic steel plate MS) (step S105). This makes it possible to smoothly perform the sequential conveyance process of the electromagnetic steel sheet MS.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present disclosure are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

The present application is appropriately incorporated by reference in the disclosure of Japanese patent application (Japanese patent application No. 2021-161455) filed at 9/30 of 2021.

Description of the reference numerals

1, Laminating iron cores;

100 manufacturing a device;

130 press working apparatus (an example of a skip die apparatus);

140. a lower die;

143. A lifter;

150. An upper die;

152. A guide pin;

153. a pressing member;

153a1 front end portion;

A direction D;

MS electromagnetic steel plate (an example of a metal plate).

Claims (7)

1. A skip die device is provided with:

an upper die and a lower die for press-working a strip-shaped metal plate sequentially conveyed in a predetermined direction;

A lifter provided in the lower die and lifting the metal plate while sequentially conveying the metal plate; and

And a pressing member provided on the upper die and pressing the metal plate from above when the lifter lifts the metal plate.

2. The apparatus of claim 1, wherein the mold device comprises a plurality of mold cavities,

The pressing member presses a widthwise central portion of the metal plate.

3. The apparatus according to claim 1 or 2, wherein,

The pressing member is provided at a position facing the lifter.

4. The apparatus according to any one of claim 1 to 3, wherein,

The guide pin is arranged on the upper die and used for positioning the metal plate,

The tip end portion of the pressing member is located above the tip end portion of the guide pin.

5. The apparatus according to any one of claims 1 to 4, wherein,

And a guide member that supports both edges of the metal plate and guides the metal plate in a direction in which the metal plate is sequentially conveyed,

The guide has a generally U-shape in cross-section.

6. A method for manufacturing a laminated core, comprising the steps of:

stamping the strip-shaped metal plate sequentially conveyed along a specified direction by using an upper die and a lower die;

lifting the metal plate by a lifter provided to the lower die while sequentially conveying the metal plate; and

When the metal plate is lifted by the lifter, the metal plate is pressed from above by a pressing member provided to the upper die.

7. The method of manufacturing a laminated core according to claim 6, wherein,

And a step of separating the pressing member from the metal plate after the metal plate is lifted by the lifter.