WO2018066518A1

WO2018066518A1 - Method for manufacturing core piece

Info

Publication number: WO2018066518A1
Application number: PCT/JP2017/035833
Authority: WO
Inventors: 広一荒川; 裕介蓮尾
Original assignee: 株式会社三井ハイテック
Priority date: 2016-10-05
Filing date: 2017-10-02
Publication date: 2018-04-12
Also published as: JP2018061344A; CN109792195B; CN109792195A; JP6761319B2

Abstract

Provided is a method for manufacturing a core piece that enables manufacturing of a core piece or a member belonging to a core piece that is sufficiently flat for practical use. This method for manufacturing a core piece, wherein core pieces are manufactured by punching a plurality of members from a single sheet of a material 1, has: a lancing step wherein a boundary line 4 is formed between one stator core piece 2a and another stator core piece 2b adjacent to the stator core piece 2a; and a reverse bending step wherein, after the lancing step, the stator core piece 2b is bent in the direction opposite the direction in which it was bent in the lancing step, thereby providing a bend in the reverse direction in the stator core piece 2b.

Description

Manufacturing method of iron core pieces

The present invention relates to a method for manufacturing an iron core piece constituting a laminated iron core.

The armature (stator and rotor) of a rotating electrical machine is formed by stacking iron core pieces. The iron core piece is manufactured by punching out a plate-like material called an electromagnetic steel plate or a silicon steel plate (hereinafter simply referred to as “material” in the present specification).

Generally, the stator of a rotating electric machine is generally formed in a cylindrical shape. The rotor of the rotating electrical machine is formed in a cylindrical shape as a whole, and is arranged concentrically inside the stator. Conventionally, an iron core piece constituting such a stator has an annular plane shape. However, winding such an integrated laminated core has a problem of poor workability. Therefore, in recent years, the core pieces are divided in the circumferential direction, and the divided core pieces (hereinafter referred to as “divided core pieces”) are stacked to form a divided core. Then, it is a general practice to form a stator by winding each of the split cores and then joining the split cores to each other. The operation of winding the divided iron core is easier than the operation of winding the integrated iron core, and is completed in a short time. Therefore, the stator composed of the split cores has the advantage that it is easier to manufacture and has higher productivity than the stator composed of an integral core.

For example, in FIG. 6 of Patent Document 1, when the divided core pieces are manufactured, a plurality of patterns of the divided core pieces are arranged in an annular shape on the surface of the material. And the pattern of the iron core piece which comprises a rotor is arrange | positioned in the center of the arrangement | sequence of the pattern of a division | segmentation iron core piece, and an iron core piece is punched out from a raw material along these patterns. If the pattern is arranged in this way, the material discard rate can be reduced. That is, the waste of the material can be reduced and the material cost can be saved. Moreover, in patent document 1, a unit number is attached | subjected to the division | segmentation iron core piece arrange | positioned circularly (refer FIG. 5), and the iron core piece with the same unit number stamped out from another raw material is laminated | stacked. Configure split iron core. Then, after winding the divided iron cores, the divided iron cores are combined and rejoined in the same order as that at the time of division to constitute the stator.

As described in Patent Document 1, when a pattern of a plurality of divided core pieces is arranged in an annular shape on the surface of the material, the boundary line between adjacent divided core pieces (reference numeral 45 in FIGS. It is necessary to cut out the attached outline). The boundary line is cut out by pressing a punch against one of adjacent divided core pieces as shown in FIG. Hereinafter, in this specification, such a processing method is referred to as “cut bending”, and a process of performing “cut bending” is referred to as a “cut bending process”.

When the cutting and bending process is performed, bending as shown in FIG. 7B of Patent Document 2 occurs in one of the adjacent divided core pieces, that is, the divided core pieces pressed against the punch. If the processing of the material is continued while leaving such a bend, the shape of the completed divided core piece may be deformed, and as a result, a gap may be formed between the stacked divided core pieces. In addition, when the split iron cores are joined to each other, a gap may occur at the joint between the split iron cores. As a result, the electromagnetic characteristics of the armature may be impaired. Alternatively, the electromagnetic characteristics of the armature may vary.

Therefore, after the cutting and bending process is performed, the divided core piece that has been bent is bent back, that is, the bending that has occurred in the divided core piece is corrected to make the divided core piece flat. For example, as disclosed in FIG. 9 of Patent Document 2, this processing is performed by pressing a material while sandwiching a material including a split core piece with bending between a flat die and a stripper plate. . Hereinafter, in this specification, the processing method for flattening the bending of the member generated by the cutting and bending process between the flat die and the stripper plate is referred to as “bending back”, and “bending back” is referred to as “bending back”. The process to be performed is referred to as a “bending back process”.

In addition, in the manufacturing process of the iron core piece, the members to be subjected to “cut bending” and “bending back” are not limited to the divided iron core pieces. For example, when manufacturing a split iron core, “cut and bend” and “bend back” are also performed on “caulking blocks” that are temporarily joined together and removed after completion of the split iron core ( Patent Document 3, FIG. 5). That is, “cut-bending” and “bending-back” may be performed on a member attached to the iron core piece and finally separated from the laminated iron core.

Japanese Unexamined Patent Publication No. 2012-10425 Japanese Unexamined Patent Publication No. 2005-318863 International Publication No. 2016/076321

As described above, in the conventional method of manufacturing an iron core piece, a member that has been bent as a result of cutting and bending is subjected to a bending back process to flatten the member. However, the bending of the member may not be sufficiently corrected only by the bending back process. Moreover, the magnitude | size of the bending which remains in a member after a bending back process is not uniform, but a dispersion | variation arises.

Therefore, there is a problem that the occurrence of variations in the electromagnetic performance of the laminated iron core due to the bending of the member cannot be sufficiently suppressed only by the bending back process. In addition, there is a problem that deterioration of the mechanical strength and mechanical reliability of the laminated core cannot be sufficiently suppressed. In addition, as disclosed in Patent Document 3, when a split iron core piece is provided with a “caulking block” and the “caulking block” remains bent, the “caulking block” is laminated after the laminated iron core is completed. In some cases, it may become impossible to separate from, or unintentionally.

The present invention has been made in view of such circumstances, and corrects the bending generated in the iron core piece or a member attached to the iron core piece at the time of cutting and bending, so that the iron core piece that is sufficiently flat in practice or An object of the present invention is to provide a method for manufacturing an iron core piece capable of producing a member attached to the iron core piece.

In order to solve the above-described problem, a method of manufacturing an iron core piece according to the present invention is a method of manufacturing an iron core piece by punching a plurality of members from a single material, and is adjacent to one member and the member. A bending process for forming a boundary line with another member to be bent, and a reverse bending process for bending the member bent in the cutting and bending process in a direction opposite to the bending direction to give the member bending in the reverse direction. It is characterized by having.

After performing the cutting and bending step, the reverse bending step may be performed without passing through other steps.

After performing the cutting and bending step, the first bending back step of correcting the bending of the member and flattening the member is performed, and after the first bending back step, the member is Performing a reverse bending step of bending the member in a direction opposite to the direction bent in the cutting and bending step, and applying a reverse bending to the member; correcting the bending of the member after the reverse bending step; You may make it perform the 2nd bending back process which makes flat.

The reverse bending step may be performed by placing the material on a die, and the die may include a protruding portion that protrudes from a placement surface on which the material is placed.

The die may include an advancing / retracting member that advances / retreats with respect to the material.

The reverse bending step is performed by placing a stripper plate on the material, and a portion of the stripper plate corresponding to the protrusion or the advancing / retracting member is spring-supported by another portion of the stripper plate. Thus, the other part may be advanced or retracted.

The reverse bending step is performed by placing a stripper plate on the material, and a through-hole penetrating the stripper plate is provided in a portion of the stripper plate corresponding to the protrusion or the advance / retreat member. May be.

The reverse bending step is performed by placing a stripper plate on the material, and a recess in which the portion of the iron core piece to be reversely bent is accommodated in the portion of the stripper plate corresponding to the protrusion or the advance / retreat member. May be formed.

The reverse bending step may be performed while the material is placed on the stage where the cutting and bending step is performed.

The cutting and bending process is performed by a press device including a punch and a pushback slider, and the punch is advanced toward the material. The reverse bending process is performed after the cutting and bending process is completed. May be moved backward from the material, and then the pushback slider may be advanced toward the material.

When the pushback slider is moved forward toward the material, the edge of the end surface of the pushback slider first comes into contact with the portion closest to the boundary line of the material, and then the pushback slider is moved forward. As the slider moves forward, the end surface may be provided with an inclination such that a portion of the end surface that is continuous with the edge sequentially contacts the material.

According to the method of manufacturing an iron core piece of the present invention, the bending that occurs in the iron core piece or a member attached to the iron core piece is corrected during the cutting and bending process, and the iron core piece is attached to a sufficiently flat iron core piece or iron core piece in practice. A member can be manufactured.

It is a top view which shows arrangement | positioning of the pattern of the member in the surface of the raw material which is a process target of the manufacturing method of the core piece which concerns on each embodiment of this invention. (A)-(i) is a figure which shows the processing sequence of the stator core piece in the manufacturing method of the core piece concerning the 1st Embodiment of this invention in time series. (A)-(d) is a figure which shows the change of the shape of the stator core piece in the manufacturing method of the iron core piece which concerns on the 2nd Embodiment of this invention in time series. It is a figure explaining the structure of the stripper plate used in the manufacturing method of the core piece which concerns on the 3rd Embodiment of this invention, (a) is an example provided with a through-hole in a stripper plate, (b) is a stripper plate. Each of the examples is provided with a slider. It is a figure explaining the structure of the die | dye used in the manufacturing method of the iron core piece which concerns on the 4th Embodiment of this invention. It is a figure explaining the structure of the press apparatus used in the manufacturing method of the iron core piece which concerns on the 5th Embodiment of this invention. (A)-(d) is a figure explaining operation | movement of the press apparatus shown in FIG.

FIG. 1 is a plan view showing the arrangement of member patterns on the surface of a material 1 that is a processing target of each embodiment of the present invention described below. The material 1 is a thin plate of an electromagnetic steel plate. As shown in FIG. 1, patterns of 12 stator core pieces 2 (2a to 2l) are annularly arranged on the surface of the material 1. The stator core pieces 2a to 2l are laminated together with the stator core pieces 2a to 2l punched from the other materials 1, respectively, and constitute twelve divided cores (not shown). Each of the 12 divided iron cores is wound. After the winding is performed, the coils are again arranged in the order of a to l and joined together to form a stator of an electric motor (not shown). In the material 1, the pattern of the rotor core pieces 3 is arranged at the center of the pattern of the stator core pieces 2a to 2l arranged in an annular shape. The rotor core piece 3 is a member that is laminated together with the rotor core piece 3 punched from the other material 1 and constitutes a stator core (not shown). Note that a portion on the inner diameter side of the stator core piece 2 (2a to 2l) that protrudes toward the rotor core piece 3, that is, a portion denoted by a symbol T in FIG. Winding applied to the iron core is wound. Further, a portion sandwiched between two adjacent teeth T, that is, a portion denoted by S in FIG. 1 is called a slot, and a stator is formed by joining divided iron cores provided with windings. In this case, a space for accommodating the winding is formed.

The stator core pieces 2a to 2l and the rotor core piece 3 are roughly punched from the material 1 following the following steps. That is, the rotor core piece 3 is first punched from the material 1 and separated from the material 1. Next, the outline of the slot S inside the stator core pieces 2a to 2l of the material 1 is punched out. Then, the boundary line 4 that divides the stator core pieces 2a to 2l is cut out. Further, the outline of the tip (inside of the ring) of the teeth T inside the stator core pieces 2a to 2l is punched out. Finally, the stator core pieces 2a to 2l are separated from the material 1 by punching out the outer contour of the stator core pieces 2a to 2l (outside of the ring).

In the above, when the boundary line 4 is cut out, the cutting and bending process described above is performed. For example, when cutting the boundary line 4 between the stator core piece 2a and the stator core piece 2b, a punch (not shown) is pressed against the stator core piece 2b. When the boundary line 4 is cut out, a part of the stator core piece 2b is bent in the vicinity of the boundary line 4. In order to correct this bending, bending back processing and reverse bending processing are performed. Hereinafter, the manufacture of the core piece according to the embodiment of the present invention will be described by taking, as an example, the cutting and bending process for cutting out the boundary line 4 between the stator core piece 2a and the stator core piece 2b and the reverse bending process performed thereafter. The method will be described in detail.

(First embodiment)
The stator core piece 2b is manufactured through a process as shown in FIG. First, as shown in FIG. 2 (a), the material 1 is sandwiched between a die 5 and a stripper plate 6 attached to a pressing device (not shown). The pressing device includes a punch 7 that moves forward and backward with respect to the material 1. When the material 1 is sandwiched between the die 5 and the stripper plate 6, as shown in FIG. 2 (b), the punch 7 is pushed down (advanced toward the material 1) and pressed against the stator core piece 2b. . As a result, the stator core piece 2b is cut and bent, and the boundary line 4 between the stator core piece 2a (material 1) and the stator core piece 2b is cut out as shown in FIG. 2 (c).
This completes the cutting and bending process. At this time, the stator core piece 2b is bent downward in the vicinity of the boundary line 4, and a step is generated between the stator core piece 2b and the stator core piece 2a (material 1). In addition, a plurality of sets of dies 5 and stripper plates 6 are attached to the press device, and thereafter, the material 1 is transferred between the plurality of sets of dies 5 and stripper plates 6 to continue processing.
In the illustrated example, as the cutting and bending process, an example in which a part of the material 1 is completely cut so that the cutting edge of the punch 7 pressed against the surface of the material 1 reaches the back surface of the material 1 is described. Is not limited to this. As the cutting and bending process, a so-called half punching process may be performed in which the pressing of the punch 7 is stopped at a point where the cutting edge of the punch 7 pressed against the surface of the material 1 does not reach the back surface of the material 1.

When the cutting and bending process is completed, the material 1 is moved between the die 5 having the protrusion 5a and the stripper plate 6 having the recess 6a as shown in FIG. 2 (d). The protrusion 5a of the die 5 is provided so as to protrude from the placement surface on which the material 1 is placed and to come into contact with a portion where the downward bending of the stator core piece 2b occurs. The recess 6 a of the stripper plate 6 is provided at a portion corresponding to the protrusion 5 a of the die 5. Then, the said press apparatus is operated and the raw material 1 is pressed as shown in FIG.2 (e). As a result, the stator core piece 2b bent downward is pushed by the protrusion 5a of the die 5 and bent upward. Then, when the pressurization by the pressing device is released, as shown in FIG. 2 (f), a step is formed at the end of the stator core piece 2b that is higher than the stator core piece 2a (material 1). This completes the reverse bending process. In addition, although the magnitude | size of the upward bending of the stator core piece 2b formed by a reverse bending process is not specifically limited, in FIG.2 (f), the stator core piece 2a (material 1) and the stator core piece 2b of FIG. It is preferable that the level difference h generated therebetween is less than 50% of the thickness of the material 1. More preferably, the step h should be less than 10% of the thickness of the material 1. Ideally, it is desirable that the level difference h becomes 0 when the pressurization by the pressing device is released after the reverse bending process is completed, that is, as shown in FIG.

When the reverse bending process is completed, the material 1 is moved between a flat die 5 and a flat stripper plate 6 as shown in FIG. Then, the said press apparatus is operated and the raw material 1 is pressed as shown in FIG.2 (h). With the above, the bending back process is completed, and the manufacturing method of the core piece according to the first embodiment is completed. As a result, as shown in FIG. 2 (i), the stator core piece 2b is flat. Compared to the case where the conventional reverse bending process is not performed, a stator core piece that is significantly flat and practically sufficiently flat can be obtained. Thereafter, other processes, for example, a process of cutting out another outline of the stator core piece 2 and a process of punching out the stator core piece 2 are performed.

In the iron core piece manufacturing apparatus, a place where the material 1 is held and processed is generally called a “stage”. The material 1 is sequentially conveyed between stages, and predetermined processing is performed in each stage. In the first embodiment, the cutting and bending process, the reverse bending process, and the bending return process are performed on separate stages. Each stage is provided with a die 5 and a stripper plate 6 dedicated to that stage (process).

(Second Embodiment)
In the first embodiment, an example in which the reverse bending process is performed without passing through other processes after the cutting and bending process and the bending back process is performed at the end is shown, but the present invention is not limited thereto. For example, as shown in FIG. 3, the bending back process may be performed after the cutting and bending process, the reverse bending process may be performed thereafter, and finally the bending back process may be performed again.

FIG. 3A is a diagram illustrating a state of the material 1 after completion of the cutting and bending process, and corresponds to FIG. 2C of the first embodiment. In the method for manufacturing an iron core piece according to the second embodiment, the material 1 shown in FIG. When the bending back process is performed, the downward bending of the stator core piece 2b decreases as shown in FIG. After that, when the material 1 is subjected to reverse bending, the stator core piece 2b is bent upward as shown in FIG. Finally, when the bending back process is performed again, as shown in FIG. 3D, the stator core piece 2b is practically sufficiently flat. The manufacturing method of the iron core piece according to the second embodiment is thus completed.

(Third embodiment)
In the first embodiment, an example is shown in which, in the reverse bending step, the upward bent portion of the stator core piece 2b is stored in the recess 6a using the stripper plate 6 including the recess 6a. It was. However, the stripper plate 6 used in the reverse bending process is not limited to the one having such a recess 6a. For example, as shown to Fig.4 (a), you may make it provide the through-hole 6b which penetrates the stripper plate 6. FIG. The through hole 6b of the stripper plate 6 is provided at a portion corresponding to the protrusion 5a provided in the die 5. In this case, the portion of the stator core piece 2b that is pushed upward and bent upward by the protrusion 5a of the die 5 is housed in the through hole 6b. Further, for example, as shown in FIG. 4B, a slider 6c that can move forward and backward with respect to the stripper plate 6 may be provided, and a spring 6d may be bridged between the stripper plate 6 and the slider 6c. The slider 6 c of the stripper plate 6 is provided at a portion corresponding to the protrusion 5 a provided in the die 5. The slider 6c is configured to be flush with the stripper plate 6 in the state shown in FIG. 4B that is not used for reverse bending. When the stator core piece 2b is bent upward in the reverse bending process, the slider 6c is pushed upward by the stator core piece 2b.

(Fourth embodiment)
In the first and third embodiments, in the reverse bending step, the die 5 having the protrusion 5a is used, the protrusion 5a is pressed under the stator core piece 2b, and the stator core piece 2b is bent upward. An example is shown. However, the die 5 used in the reverse bending process is not limited to a structure having such a protrusion 5a. For example, as shown in FIG. 5, a pusher pin 5 b that can be raised and lowered with respect to the die 5 may be provided in the die 5. The pusher pin 5 b is driven by an actuator (not shown) and moves up and down with respect to the die 5. In this case, the material 1 is placed in a state where the pusher pin 5b is lowered and the die 5 is flattened. And after pinching | interposing the raw material 1 between the die | dye 5 and the stripper plate 6, as shown with a broken line in FIG. 5, the pusher pin 5b is raised. As a result, the stator core piece 2b can be pushed up by the pusher pin 5b to perform reverse bending. Note that the pusher pin 5 b corresponds to an advancing / retracting member that advances / retreats with respect to the material 1.

(Fifth embodiment)
In each of the first to fourth embodiments, the material 1 was cut and bent using the dedicated die 5 and the stripper plate 6. Thereafter, the material 1 was transferred onto another die 5, and the material 1 was subjected to reverse bending using the other die 5 and the stripper plate 6. That is, the example in which the cutting and reverse bending steps are performed using separate dies 5 and stripper plates 6 is shown. This shows an example in which the cutting and reverse bending steps are performed on separate stages, but the method of manufacturing the core piece according to the present invention is not limited to these. For example, the cutting and reverse bending steps may be performed on the same stage. That is, the cutting and bending steps and the reverse bending step may be performed using the same die 5 and stripper plate 6. In the fifth embodiment, an example will be described in which the cutting and bending steps are continuously performed while the material 1 is placed on the same die 5.

FIG. 6 is a diagram showing the configuration of the press device 8 used in the fifth embodiment. As shown in FIG. 6, the press device 8 includes an upper die 8a and a lower die 8b. The upper mold 8a is driven by a drive device (not shown) so as to advance and retreat (elevate) with respect to the lower mold 8b. A punch 7 is attached to the upper die 8a so as to be able to advance and retract. The punch 7 is a member that pushes and bends the material 1 from above and is driven by an actuator (not shown). In the lower die 8b, a pushback slider 9 is attached to a portion facing the punch 7 of the upper die 8a so as to be able to advance and retreat. The pushback slider 9 is a member that reversely bends the material 1 by pressing the material 1 from below, and is driven by an actuator (not shown). The material 1 is sandwiched between the die 5 and the stripper plate 6 and placed on the lower mold 8b.

The punch 7 is a kind of cutting blade. The lower surface of the punch 7 is inclined so that the left side in FIG. 6 is lowered and the right side is raised. An edge 7 a is formed at the lower left end of the punch 7. Therefore, when the punch 7 is lowered, the edge 7 a contacts the material 1 to shear the material 1. As a result, the boundary line 4 is formed at the part where the edge 7a abuts. Further, the portion of the material 1 that contacts the lower surface of the punch 7 is bent along the inclination of the lower surface of the punch 7. That is, the portion of the material 1 with which the punch 7 abuts is bent down so that the side closest to the boundary line 4 is pushed down the lowest and becomes higher as the distance from the boundary line 4 increases.

The upper surface of the pushback slider 9, that is, the end surface in contact with the material 1, has an inclination in which the left side rises upward and the right side falls downward in FIG. The edge 9 a of the end surface of the pushback slider 9 is at a position facing the edge 7 a of the punch 7. Therefore, when the pushback slider 9 is advanced (raised) toward the material 1, the edge 9 a first contacts the portion closest to the boundary line 4 of the material 1. Thereafter, as the pushback slider 9 is further advanced (raised), a portion continuing to the edge 9a of the end surface of the pushback slider 9 is located farther from the boundary line 4 than the portion where the edge 9a of the material 1 is in contact. Sequentially contact the material 1. As a result, the portion of the material 1 with which the pushback slider 9 abuts is bent up so that the side closest to the boundary line 4 is lifted highest and becomes lower as the distance from the boundary line 4 increases. That is, the portion of the material 1 with which the pushback slider 9 abuts is bent in the opposite direction to the cutting and bending.

The cutting and reverse bending processes by the press device 8 are executed according to the procedure shown in FIG. First, as shown in FIG. 7A, the upper die 8a is lowered, and the material 1, the die 5 and the stripper plate 6 are sandwiched between the upper die 8a and the lower die 8b and fixed to the pressing device 8. At this time, the punch 7 is in the raised position and the pushback slider 9 is in the lowered position. Next, as shown in FIG. 7B, the punch 7 is lowered and pressed against the material 1 to perform cutting and bending. As a result, the stator core piece 2b is bent downward. Next, as shown in FIG. 7C, the punch 7 is raised and separated from the stator core piece 2b. Finally, as shown in FIG. 7D, the pushback slider 9 is raised to push up the stator core piece 2b, and reverse bending is performed. As described above, according to the press device 8, the material 1 is held between the die 5 and the stripper plate 6, that is, the die bending process and the reverse bending process are performed without exchanging the die 5 and the stripper plate 6. Can be carried out continuously. Therefore, the work time concerning manufacture of an iron core piece can be shortened.

As described above, according to each of the above-described embodiments, the reverse bending process is performed between the cutting and bending processes, and the stator core piece 2b that has been pushed and bent is bent in the reverse direction. For this reason, in the bending back process, the stator core piece 2b can be bent back sufficiently practically. That is, the stator core piece 2b that is practically sufficiently flat can be manufactured. In addition, it is possible to suppress the occurrence of variations in the electromagnetic performance of the laminated core due to the bending of the iron core piece or the member attached to the iron core piece generated in the cutting and bending process. Furthermore, it is possible to suppress a decrease in mechanical strength and mechanical reliability of the laminated iron core. However, the technical scope of the present invention is not limited by the above embodiments. The present invention can be freely applied, modified or improved within the scope of the technical idea shown in the claims.

In each of the first and second embodiments, the example in which the bending back process is performed after the reverse bending process (process) is completed has been described. However, the bending back process is essential in the method for manufacturing the core piece according to the present invention. This is not a process. For example, in the first embodiment, when the magnitude of the bending in the reverse bending step is adjusted and the pressurization by the press device 8 is released after the reverse bending step is completed, that is, when the step shown in FIG. If h is set to 0, the subsequent bending back process (process) becomes unnecessary.

In each of the above-described embodiments, an example (FIG. 2 (f), etc.) in which bending remains in the material 1 when the pressurization by the press device 8 is released after the reverse bending process is completed is shown. That is, an example has been shown in which “backward bending” given to the material 1 in the reverse bending process occurs in the plastic region. However, the manufacturing method of the iron core piece according to the present invention is not limited to the one in which “bending in the reverse direction” occurs in the plastic region. “Reverse bending” may occur in the elastic region. In other words, as described above, in the method of manufacturing the iron core piece according to the present invention, the step h is 0 when the pressurization by the pressing device 8 is released after the reverse bending process is completed, that is, as shown in FIG. It may be what becomes.

Moreover, in each said embodiment, although the stator core piece 2 was illustrated as a specific example of the member reversely bent, in this invention, the member used as the object of reverse bending is in the stator core piece 2. It is not limited. That is, the member is not limited to a member that is laminated to form a stator. For example, the member may be a member (rotor core piece) that is laminated to form a rotor. Moreover, this member is not limited to the member which finally comprises a laminated iron core. For example, the member may be a member attached to the iron core piece and separated from the laminated iron core after the laminated iron core is completed, that is, a member such as a “caulking block” described in Patent Document 3. .

Further, the armature constituted by the iron core piece manufactured by the iron core piece manufacturing method according to the present invention is not limited to the armature constituting the motor. The armature constituted by the iron core piece manufactured by the iron core piece manufacturing method according to the present invention may be, for example, an armature constituting a generator.

The shape, quantity, and arrangement of the stator core piece 2 and the rotor core piece 3 shown in FIG. 1 are examples, and the technical scope of the present invention is not limited by these. For example, the shape of the boundary line 4 is also an example.

2 to 7 are a kind of conceptual diagram. Therefore, the shapes of the die 5, the stripper plate 6, the punch 7, the press device 8, and the pushback slider 9 shown in these drawings are examples, and the technical scope of the present invention is not limited by these. According to the method for manufacturing an iron core piece according to the present invention, iron core pieces having various shapes can be manufactured.

In the description of each of the above embodiments, for convenience of explanation, the set of the die 5 and the stripper plate 6 used in each stage (process) is illustrated as being physically separated. For example, a set of the die 5 and the stripper plate 6 shown in FIG. 2A, a set of the die 5 and the stripper plate 6 shown in FIG. 2D, and the die 5 and the stripper plate shown in FIG. The set of 6 is illustrated as being physically separated. However, the die and stripper plate used in the practice of the present invention are not limited to such a configuration. For example, the die 5 and the stripper plate 6 used in each stage (process) may be physically integrated. That is, the structure provided with the group of the die | dye 5 by which the some stage is arrange | positioned, and the stripper plate 6 corresponding to it may be sufficient. In this case, the material 1 is transferred from one stage arranged on the die 5 to another stage arranged on the same die 5 (see, for example, Japanese Patent Application Laid-Open No. 2004-23964, FIGS. 7 and 8).

In each of the above embodiments, an example has been described in which the stator core piece 2b is bent downward in the cutting and bending process, and the stator core piece 2b is bent upward in the reverse bending process, but the bending direction may be reversed. good. That is, the stator core piece 2b may be bent upward in the cutting and bending process, and the stator core piece 2b may be bent downward in the reverse bending process.

This application is based on a Japanese patent application filed on October 5, 2016 (Japanese Patent Application No. 2016-197069), the contents of which are incorporated herein by reference.

1: Material 2 (2a to 2l): Stator core piece 3: Rotor core piece 4: Boundary line 5: Die 5a: Protrusion 5b: Pusher pin 6: Stripper plate 6a: Recess 6b: Through hole 6c: Slider 6d : Spring 7: Punch 7a: Edge 8: Press device 8a: Upper die 8b: Lower die 9: Pushback slider 9a: Edge h: Step S: Slot T: Teeth

Claims

In the method of manufacturing an iron core piece in which a plurality of members are punched from one material to produce the iron core piece,
A cutting and bending step of forming a boundary line between one member and another member adjacent to the member;
A method of manufacturing an iron core piece, comprising: a reverse bending step of bending the member bent in the cutting and bending step in a direction opposite to a bending direction thereof to impart a bending in the reverse direction to the member.
2. The method of manufacturing an iron core piece according to claim 1, wherein the reverse bending step is performed without performing another step after the cutting and bending step.
After performing the cutting and bending step, correct the bending of the member, and perform a first bending back step of flattening the member,
After the first bending back step, a reverse bending step is performed in which the member is bent in a direction opposite to the direction in which the member is bent in the cutting and bending step, and the member is bent in the reverse direction.
2. The method of manufacturing an iron core piece according to claim 1, wherein after the reverse bending step, a second bending back step of correcting the bending of the member and flattening the member is performed.
The reverse bending step is performed by placing the material on a die,
The die includes a protrusion protruding from a placement surface on which the material is placed,
The manufacturing method of the core piece as described in any one of Claims 1-3 characterized by the above-mentioned.
The reverse bending step is performed by placing the material on a die,
The die includes an advancing and retracting member that advances and retracts with respect to the material.
The manufacturing method of the core piece as described in any one of Claims 1-3 characterized by the above-mentioned.
The reverse bending step is performed by placing a stripper plate on the material, and a portion of the stripper plate corresponding to the protrusion or the advancing / retracting member is spring-supported by another portion of the stripper plate. The method of manufacturing an iron core piece according to claim 4, wherein the advancing / retreating with respect to the other part.
The reverse bending step is performed by placing a stripper plate on the material, and a through hole penetrating the stripper plate is provided in a portion of the stripper plate corresponding to the protrusion or the advance / retreat member. The manufacturing method of the iron core piece of Claim 4 or Claim 5 characterized by these.
The reverse bending step is performed by placing a stripper plate on the material, and a recess in which the portion of the iron core piece to be reversely bent is accommodated in the portion of the stripper plate corresponding to the protrusion or the advance / retreat member. The method of manufacturing an iron core piece according to claim 4 or 5, wherein: is formed.
The method of manufacturing an iron core piece according to claim 1 or 2, wherein the reverse bending step is performed while the material is placed on a stage on which the cutting and bending step has been performed.
The cutting and bending process is performed by a press device including a punch and a pushback slider, and the punch is advanced toward the material. The reverse bending process is performed after the cutting and bending process is completed. The method of manufacturing an iron core piece according to claim 9, wherein the method is performed by retracting the material from the material and then moving the pushback slider toward the material.
The pushback slider is
When the pushback slider is advanced toward the material, the edge of the end surface of the pushback slider first comes into contact with the portion of the material closest to the boundary line, and then the pushback slider advances. The method of manufacturing an iron core piece according to claim 10, wherein a portion of the end face that is continuous with the edge is provided with an inclination on the end face so as to sequentially contact the material.