JP4858944B2 - Manufacturing method of laminated iron core - Google Patents

Description

    The present invention relates to a method for manufacturing a laminated iron core formed by laminating iron core pieces and used for an electric motor, a transformer, and the like.

    Conventionally, a laminated iron core is manufactured by punching an iron core piece in which a metal plate is formed in a predetermined shape with a progressive die apparatus from the metal plate and caulking and laminating many iron core pieces.

  In the production of this laminated iron core, a metal plate is formed as a strip metal plate welded and connected in a long strip shape, and an iron core piece is punched from the strip metal plate.

  Laminated iron cores are made by laminating thin metal strips, for example, iron strips made of belt-shaped electrical steel sheets, for example, in order to increase the efficiency, output, and performance of motors built in. There is. In order to prevent the disturbance of the magnetic field generated by electromagnetic induction, such a laminated iron core is not closely spaced between the core pieces, and the laminated iron pieces are uniform and there is no difference between the iron pieces. desired.

  By the way, the work of punching and laminating the core pieces from the belt-shaped metal plate is performed using a progressive metal mold device, and the part including the weld seam of the belt metal plate is naturally passed through the metal mold device to the iron core. Pieces are formed, and the iron core pieces are caulked and laminated in the same manner as the other iron core pieces. Depending on the laminated iron core, there is no problem even if the iron core pieces including the weld seam are laminated.

  At the time of filing, there is no known literature invention known to the applicant.

    By the way, in laminated cores that require strict quality characteristics, the core piece including the weld seam is unavoidably present in the welding connection technology, but the welded alloy layer is unavoidably present. When there are weld alloys having different characteristics, the magnetic field formed by the laminated core is disturbed, so it is desirable to remove the core pieces including the weld seam.

  Further, as shown in FIG. 4A of the top view of the conventional laminated core 100 and FIG. 4B of the side view, the core piece 102 including the weld seam is thick in the weld seam and other weld seams are present. Since the plate thickness is thicker than the iron core piece 101 that does not exist, as a result, the shape accuracy of the laminated core 100 is deteriorated. Therefore, in order to improve the shape accuracy of the laminated core 100, it is desirable to remove the core piece 102 including the weld seam portion.

  However, even if the core piece 102 is excluded, it has been impossible in the past to remove only one iron core piece that is sequentially punched from the strip metal plate by the progressive die apparatus without stopping the operation of the progressive mold apparatus.

  Therefore, the laminated core 100 in which the core pieces 102 including the weld seam portions are laminated is discarded, or the laminated core 100 is separated and the core pieces 102 are manually removed and re-laminated. As a result, wasteful use of resources and a decrease in productivity have occurred, and there has been a problem that a laminated core having excellent quality characteristics cannot be manufactured efficiently and stably.

  In view of the above, the present invention automatically removes the core piece including the weld seam portion in the manufacture of the laminated core in which the core pieces are sequentially punched by the progressive die apparatus and laminated together by caulking with each other, and the quality characteristics are The purpose is to produce an excellent and accurate laminated iron core efficiently and stably.

In order to achieve the above object, a method for manufacturing a laminated iron core according to claim 1 of the present invention is such that a strip metal plate is intermittently passed through a progressive die apparatus to punch out the iron core pieces, and the iron core pieces are laminated and caulked. A method of manufacturing a laminated core, comprising: a step of detecting a welding seam of the strip metal plate before the strip metal plate intermittently enters the progressive die apparatus; and the strip metal plate Is passed through a predetermined processing station of a progressive die apparatus , and a welding seam detection point has been passed through in a stamping step and a crimping portion forming station which is one of the punching steps. In this case, the step of forming the caulking portion as a caulking portion through hole based on the weld seam detection signal, and if the weld seam detection point passes, the outer shape punching / lamination processing station is not operated based on the weld seam detection signal You Without cutting the outer shape of the iron core piece and laminating and caulking when the region not including the weld seam detection point passes, Become.

A method for manufacturing a laminated core according to claim 2 of the present invention is a laminate in which a strip metal plate is intermittently passed through a progressive mold apparatus to punch out the core pieces, and the core pieces are laminated and crimped to produce a laminated core. A method of manufacturing an iron core, comprising: a step of detecting a welding seam of a strip metal plate before the strip metal plate intermittently enters the progressive mold device; and In the process of sequentially punching the desired shape of the iron core piece through the machining station, and in the caulking part forming station which is one of the punching processes, if the weld seam detection point passes, it is based on the weld seam detection signal. The step of forming the crimping portion as a crimping portion through-hole, the step of partially punching the outer shape-extracted portion, and if the welded seam detection location passes, the outer shape punching / lamination processing station is set based on the welding seam detection signal. Operation Without being processed, it is sent out continuously with the punched remaining material of the strip-shaped metal plate, and on the other hand, if the region not including the weld seam detection point passes through, the remaining part of the outer punched part of the iron core piece is punched Laminating and crimping.

    As described above in detail, according to the method for manufacturing a laminated core according to claim 1 of the present invention, the core piece including the weld seam portion is not removed, and only the other core pieces are punched and caulked and laminated. Therefore, a laminated core having excellent quality characteristics and excellent shape accuracy is manufactured. Further, the iron core piece including the weld seam portion is automatically sent out from the progressive die apparatus together with the punching remaining material.

  Therefore, the manufacturing function of the laminated core by the progressive die apparatus can be utilized without delay, the productivity can be good, and the material yield can be increased.

  According to the method for manufacturing a laminated iron core according to claim 2 of the present invention, in addition to the effect of the invention of claim 1, the formation of the tightening protrusions formed on the outer shape of the core piece, The shape can be easily removed without difficulty and the shape accuracy can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  A laminated core 1 manufactured by applying the method for producing a laminated core of the present invention (see FIG. 1A in a perspective view and FIG. 1B in a side view) is used for a stator of an electric motor. A large number of iron core pieces 10 (see FIG. 2) punched into a predetermined shape from a strip-shaped metal thin plate such as an electromagnetic steel plate, which is a material, are stacked and crimped at a crimping portion k.

  The laminated core 1 is formed by laminating a plurality of magnetic poles 2 formed by laminating magnetic pole portions 12 of an iron core piece 10 and being wound (not shown), and a yoke portion 13 of the iron core piece 10. A yoke 3 through which a magnetic field due to a current flowing through the wire is transmitted, and a tightening protrusion 4 that is formed by laminating a tightening protrusion 14 of the core piece 10 and used for tightening to eliminate a gap between the core pieces 10 are provided. .

  Next, the manufacturing method of the laminated iron core 1 is demonstrated using FIG. FIG. 3 is a top view showing a process of manufacturing the laminated core 1 by press working from a strip steel plate (band metal plate) t that is intermittently transported by a progressive die apparatus.

Here, in the production of the laminated iron core 1, in order to improve productivity and increase the yield of the metal plate as a base material, the metal plate is formed as a belt-like metal plate t welded and connected in a long belt shape. The iron core piece 10 is punched and formed from a band-shaped metal plate by intermittently feeding the inside of the progressive die apparatus, and the laminated iron core 1 is manufactured.

  Since a welded seam (not shown) is formed on the belt-shaped metal plate t, a welded seam for detecting a welded seam is produced for the purpose of manufacturing the laminated core 1 using only the core piece 10 without a welded seam. A detector h is used. As the weld seam detector h, for example, an eddy current detector that detects a weld seam from a change in permeability due to a difference in material of the belt-shaped metal plate t is used.

  The progressive metal mold apparatus provided with the weld seam detector h includes processing stations S1 to S8 for manufacturing the laminated iron core 1 by sequentially performing a predetermined pressing process on the strip-shaped steel sheet t conveyed intermittently.

  Moreover, the progressive metal mold apparatus is provided with the control apparatus S which controls the conveyance and press work of intermittent feeding of the strip | belt-shaped metal plate t in an integrated manner. The control device S outputs an intermittent feed signal ik to perform intermittent feed control of the belt-shaped metal plate t, and outputs a control signal for controlling the press working operation to each of the processing stations S1 to S8. In addition, when the welding seam detector h detects the welding seam of the strip-shaped metal plate t, a welding seam detection signal ik1 is transmitted to the control device S, and is used for operation control of the press work in the processing stations S4 and S8. .

  After the strip-shaped steel plate t is intermittently fed to each of the processing stations S1 to S8 and the positioning guide hole g is punched out at the processing station S1, the predetermined processing stations S2 to S8 are transferred to the progressive die apparatus having the above-described configuration. In FIG. 2, a pilot pin (not shown) is inserted into the guide hole g to position the strip steel plate t, and a predetermined pressing process is performed.

  First, in the processing station S1, the strip steel plate t is formed by punching a guide hole g for positioning the strip steel plate t from the strip steel plate t by inserting a pilot pin (not shown) in each processing station.

Subsequently, in the processing station S2, the inner diameter 10n of the iron core piece 10 is punched from the strip steel plate t.

  Subsequently, in the processing station S3, slots 12s between the magnetic pole portions 12 of the iron core piece 10 are formed by punching from the strip steel plate t.

  Subsequently, in the processing station S4, a caulking portion through hole k0 that is a caulking portion k formed in the first core piece 10 is formed by punching from the strip-shaped steel sheet t. On the other hand, a caulking protrusion k1, which is a caulking portion k, is punched and formed from the strip-shaped steel sheet t on the second and subsequent laminated layers, that is, the second, third, fourth,. As the caulking projection k1 of the caulking portion k, in addition to the half-projection projection, a caulking projection such as a v-shaped projection or a cut-and-raised projection can be appropriately selected.

On the other hand, when the location where the weld seam detection signal ik1 is detected is transferred to the processing station S4 which is a crimping portion forming station, the crimping portion k is formed as the crimping portion through hole k0 . This is to prevent the iron core (not shown) previously stacked at the die d or the processing station S8 from being caught at the time of later feeding (described later) from the processing station S8.

  The caulking portion through hole k0 is formed by inserting a caulking punch into the die hole deeper than when the caulking protrusion is formed.

  Subsequently, in the processing station S5, the tightening hole 14h of the tightening protrusion 14 of the iron core piece 10 is formed by punching from the strip steel plate t.

  The next processing station S6 is a play station for balancing the entire mold apparatus.

  Subsequently, in the processing station S7, the tightening protrusion 14 of the iron core piece 10 is formed by punching from the strip steel plate t.

  Subsequently, at the processing station S8, with respect to the normal core piece 10 having no weld seam, 10 g of the outer shape of the core piece 10 (the remaining portion of the outer shape-extracted portion) is punched from the strip-shaped steel sheet t, and is placed on the lower core piece 10. The caulking portion k is laminated and caulked in accordance with the caulking portion k of the lower iron core piece 10.

  On the other hand, when the iron core piece 10 having the weld seam is conveyed, the control device S controls based on the weld seam detection signal ik1 detected in advance, and the outer shape 10g is removed and the caulking or the like is processed without being performed. The remaining material tz punched out is sent out. Thus, by removing the core piece 10 having the welded seam from the formation of the laminated core 1, the high-quality laminated core 1 made of the core piece 10 without the welded seam can be manufactured.

  According to the above configuration, the weld seam of the strip steel plate t is detected in advance before the strip steel plate t intermittently enters the progressive die apparatus, and the weld seam detection point is detected at the processing station S8 which is an outer shape drawing / lamination station. Has passed through the punching residual material tz of the strip steel plate t without operating the processing station S8, while when a portion not including the weld seam detection portion has passed through, the core piece 10 is removed. And then stack and crimp. Accordingly, the core piece 10 including the weld seam portion is not removed from the outer shape, and only the other iron core pieces 10 are punched out, stacked and crimped, and the laminated core 1 is manufactured.

  Therefore, the laminated core 1 with excellent quality characteristics and excellent shape accuracy is manufactured. Further, the iron core piece 10 including the weld seam portion is automatically sent out from the progressive die apparatus together with the punching remaining material tz.

  Therefore, the manufacturing function of the laminated core 1 by the progressive die apparatus is utilized without delay, and there are effects such as high productivity and high material yield.

  Further, in the processing station S7 in front of the processing station S8 of the outer shape punching / lamination station, a part of the tightening protrusion 14 at the outer shape punching portion is partially punched from the strip-shaped steel sheet t to be processed into the processing station S8 of the outer shape punching / lamination station. When the weld seam detection point has passed through, the station is not operated, and before the next operation, it is fed continuously to the punching remaining material tz, while the processing station S8 passes through the part not including the weld seam detection point. Then, the remaining outer shape 10g of the outer shape-extracted portion of the iron core piece 10 is punched out, laminated and crimped.

  Therefore, the iron core piece 10 having the tightening projection 14 projecting to the outer shape can be easily formed without difficulty and the outer shape can be easily removed, and the shape accuracy can be improved.

  Further, by forming the crimped portion k including the weld seam detection location as the crimping portion through hole k0, the weld seam detection location is first laminated at the die d or the processing station S8 when the welding seam detection location is sent out from the processing station S8. It can be prevented from being caught by the laminated iron core.

  In the above-described embodiment, the manufacture of the laminated core 1 having the tightening protrusions 4 has been described as an example. However, in the case of the laminated core having no tightening protrusions 4, the process of the processing station S7 is performed. Needless to say, a high-quality laminated iron core can be manufactured by the same method as in the embodiment by punching out the outer shape of the iron core piece at the processing station S8.

    As an application example of the present invention, in addition to the stator laminated core of the motor described in the embodiments, the invention is limited to a laminate produced by laminating metal pieces such as a rotor laminated core of an electric motor and a laminated core for a transformer. It is applicable without.

(a) And (b) is the perspective view and side view which show the laminated iron core of the Example in connection with this invention. (a) And (b) is the top view and side view which show the iron core piece which comprises the laminated iron core of an Example. The top view which shows the process of manufacturing the laminated iron core of an Example by a press work from a strip-shaped steel plate with a progressive die apparatus. (a) And (b) is the top view and side view which show the conventional laminated iron core.

Explanation of symbols

1 ... laminated iron core,
10 ... Iron core piece,
10g ... the outer shape of the core piece (the remaining part of the outer part)
ik1 ... weld seam detection signal,
S1 to S7: Processing station (predetermined processing station),
S8 ... Machining station (external shape drawing / lamination processing station),
t: strip steel plate (strip metal plate),
tz ... Punched remaining material.

Claims (2)

A method of manufacturing a laminated core, in which a strip-shaped metal plate is intermittently passed through a progressive die apparatus, punching out an iron core piece, laminating the iron core piece and caulking to produce a laminated iron core,
In front of the band-shaped metal plate is intermittently passed into the progressive die apparatus, and detecting the welding seam of the band-shaped metal plate,
And sequentially punching process into a desired shape of the core pieces through the strip metal plate to a predetermined processing station of the progressive die apparatus,
In the caulking portion forming station that is one of the punching steps, if the weld seam detection location has passed, the step of forming the caulking portion as a caulking portion through hole based on the weld seam detection signal;
When the welded seam detection point has passed, the welded seam detection signal is sent out continuously to the blanking material of the strip metal plate without working without operating the outline punching / lamination processing station based on the weld seam detection signal, When an area that does not include the detection point has passed, punching out the outer shape of the core piece and stacking and crimping ,
A method for producing a laminated iron core, comprising: A method of manufacturing a laminated core, in which a strip-shaped metal plate is intermittently passed through a progressive die apparatus, punching out an iron core piece, laminating the iron core piece and caulking to produce a laminated iron core,
In front of the band-shaped metal plate is intermittently passed into the progressive die apparatus, and detecting the welding seam of the band-shaped metal plate,
And sequentially punching process into a desired shape of the core pieces through the strip metal plate to a predetermined processing station of the progressive die apparatus,
In the caulking portion forming station that is one of the punching steps, if the weld seam detection location has passed, the step of forming the caulking portion as a caulking portion through hole based on the weld seam detection signal;
A process of partially punching out the outer part,
When the welded seam detection point has passed, the welded seam detection signal is sent out continuously to the blanking material of the strip metal plate without working without operating the outline punching / lamination processing station based on the weld seam detection signal, If the area that does not include the detection point has passed through, punching the remaining part of the outer part of the core piece and stacking and caulking ,
A method for producing a laminated iron core, comprising:

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