JP6466962B2 - Laminated core manufacturing apparatus, laminated core manufacturing method, and laminated core - Google Patents

Description

  The present disclosure relates to a laminated core manufacturing apparatus, a laminated core manufacturing method, and a laminated core.

  In general, the laminated core is widely used in electric devices such as motors and transformers, and is usually manufactured using a mold. For example, in a progressive die, a core plate that has been externally cut after a required processing such as punching is sequentially performed on a hoop material (strip-shaped thin steel plate) of an electromagnetic steel plate that is sequentially fed in the die. A laminated core is manufactured by laminating and fixing.

  By the way, one of the performances required for the laminated core is that the iron loss is small. Reduction of the iron loss in the laminated core is an important issue for realizing high efficiency of the electrical equipment in which the laminated core is mounted. However, in the manufacturing process of the laminated core, the work material (hoop material or core plate) is distorted and the stress remains, which may increase the iron loss of the laminated core.

  Therefore, in order to reduce the iron loss of the laminated core, a technique for removing the residual stress by annealing the laminated core is known. For example, in Patent Document 1, a split core sheet partially connected to a strip steel plate is annealed by passing through a continuous heat treatment furnace with the strip steel plate, and then the stator core is manufactured by separating the split core sheet from the strip steel plate. A method is described. Further, in Patent Document 2, for the purpose of removing the internal residual stress of the workpiece, a first heat treatment step is provided upstream of the press working step, and the first shape processing station, the second shape processing station, Describes a method of manufacturing a laminated magnetic pole core in which a second heat treatment step is provided therebetween.

JP 2009-38915 A Japanese Patent Laid-Open No. 9-237726

As described above, heating for the purpose of removing the residual stress in the laminated core is an effective method for reducing the iron loss and increasing the efficiency of the electric device equipped with the laminated core. From the viewpoint of reducing the overall size of the laminated core manufacturing apparatus and improving the throughput in producing the laminated core, it is desirable to heat the laminated core for the purpose of removing residual stress in the mold apparatus.
However, if the function of a heating means (for example, a continuous heat treatment furnace described in Patent Document 1 or a bright annealing furnace described in Patent Document 2) for heating the laminated core as a whole is incorporated in the mold, the residual In order to heat the laminated core to a temperature range where the effect of removing stress can be expected, the amount of heat input to the mold becomes large. Therefore, it is difficult to maintain the accuracy of the mold due to the thermal expansion of the mold.

  In view of the above-described circumstances, at least one embodiment of the present invention provides a laminated core manufacturing apparatus capable of heating a laminated core in a mold for the purpose of removing residual stress while suppressing deterioration in accuracy of the mold. It is another object of the present invention to provide a laminated core manufacturing method and a laminated core.

(1) A laminated core manufacturing apparatus according to at least one embodiment of the present invention includes:
A laminated core manufacturing apparatus for manufacturing a laminated core by laminating core plates formed by punching thin plates,
A mold part including a first mold and a second mold disposed opposite to the first mold;
A transport unit for transporting the thin plate in the transport direction in the mold part;
An outer punch for punching the outer shape of the thin plate provided in the first mold;
An outer die that is provided in the second die so as to face the outer punch, and forms the outer punch stage together with the outer punch;
The outer shape stage, or provided in the mold part on the upstream side of the outer shape stage, and an energy irradiation unit for irradiating the thin plate or the core plate with energy,
The energy irradiation unit selectively irradiates the energy to a region of the thin plate or the core plate where the residual stress caused by punching has occurred, and locally heats the region to apply the residual stress. It is configured to release.

According to the configuration of the above (1), the thin plate or the core plate is heated on the upstream side of the outer shape stage or the outer shape stage by the energy irradiation unit for the purpose of releasing the residual stress in the laminated core. . Therefore, the residual stress accumulated by the punching process up to the outer shape stage can be released, and the iron loss of the laminated core due to the residual stress can be reduced.
At that time, the energy irradiation unit selectively irradiates energy to a region where residual stress caused by the punching process occurs in the thin plate or the core plate, and locally heats the region. For this reason, compared with the case where a thin plate or a core plate is heated as a whole, the amount of heat input to the mold can be reduced, and a reduction in processing accuracy due to thermal expansion of the mold can be prevented.

(2) In some embodiments, in the configuration of the above (1), the energy irradiation unit is provided on the opposite side of the outer punching die across the tip surface of the outer punching punch in the outer punching stage. The region is irradiated with the energy through at least a part of the outer punch.
In general, since the outline punch operates continuously in the outline extraction stage, depending on the position of the residual stress generation region, energy irradiation by the energy irradiation unit may be hindered by the outline extraction punch.
According to the configuration of (2) above, the energy irradiation unit is provided on the opposite side of the outer punching die across the tip surface of the outer punch, and the region is irradiated with energy through the outer punch. Thus, the residual stress generation region can be effectively irradiated with energy without being obstructed by the punching of the outer shape during operation. As a result, the residual stress generation region can be quickly heated up to a high temperature region where an annealing effect can be expected, and the time required for the heating process by the energy irradiation unit can be shortened.

(3) In some embodiments, in the configuration of (2), the outer punch is formed with an opening through which the energy can pass.
Thereby, an energy irradiation part can also be arrange | positioned behind an outline punch with respect to energy irradiation object, and the freedom degree of arrangement | positioning of an energy irradiation part becomes high.

(4) In some embodiments, in the configuration of the above (3), the outline punch is
A punch main body provided with the opening and having a blade for punching the outer shape of the thin plate at least at a part of the outer periphery;
A transmissive member attached to the punch body so as to close the opening and capable of transmitting the energy.
Thus, since the transmissive member is attached so as to close the opening formed in the outer punch, it is possible to irradiate energy through the outer punch while suppressing a decrease in rigidity of the outer punch. .

(5) In one embodiment, in the configuration of (4) above, the tip surface of the punch body and the tip surface of the transmission member are on the same plane.
Thereby, since there is no step at the boundary between the front end surface of the punch body and the front end surface of the transmission member, it is possible to prevent the deformation due to the step of the core plate obtained by the outer shape removal.
In this specification, the front end surface of the punch body and the front end surface of the transmission member are “existing on the same plane”. Both end surfaces exist on the same plane in a geometrically strict sense. Not only when the outer shape of the thin plate is cut out but also when the two end surfaces are on the same plane as long as they do not hinder the suppression of deformation of the core plate. Including.

(6) In one embodiment, in any one of the configurations (1) to (5), the outer punch is located at the top dead center farthest from the outer punch die and inside the outer punch die. It is configured to punch out the outer shape of the thin plate by repeating reciprocating motion with the bottom dead center,
The transport unit intermittently transports the thin plate so that the thin plate moves in the transport direction only during at least a part of a period in which the outer punch is located closer to the top dead center than the thin plate. Configured,
The energy irradiation unit is configured to irradiate the core plate with the energy in at least a part of a period in which the thin plate is stopped at the outer shape stage.
According to the structure of said (6), an energy irradiation part irradiates energy to a core plate in the state which the thin plate has stopped. Therefore, energy can be accurately irradiated to the region where the residual stress of the core plate is generated.

(7) In one embodiment, in any one of the configurations (1) to (6), the first mold is provided and is positioned on a punching stage on the upstream side of the outer shape stage in the transport direction. Punch holes to punch,
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The mold part is a progressive mold apparatus in which both the hole punching stage and the outer shape punching stage are provided.
According to the configuration of (7), in one progressive die, hole punching, heating for releasing residual stress, and outline punching are mainly performed. As a result, the entire laminated core manufacturing apparatus can be made more compact, and the throughput in manufacturing the laminated core can be further improved.

(8) In another embodiment, in any one of the above configurations (1) to (6), the first die is provided on the upstream punching stage in the transport direction with respect to the outer shape drawing stage. A hole punch that is located,
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The mold part is
An upstream mold apparatus provided with the punching stage;
A downstream mold apparatus that is provided separately from the upstream mold apparatus so as to be positioned downstream of the upstream mold apparatus, and that has the outer shape stage,
The energy irradiation unit is configured to be provided on the upstream side of the outer shape stage or the outer shape stage in the downstream mold apparatus.
According to the configuration of (8) above, the upstream mold apparatus mainly performs hole punching, and the downstream mold apparatus mainly performs heating for releasing residual stress and outline punching. It is like that. That is, since the upstream mold apparatus is separated from the energy irradiation unit, there is no heat input from the energy irradiation unit to the upstream mold apparatus, and the upstream mold apparatus is caused by thermal expansion of the upstream mold apparatus. It is possible to prevent a decrease in machining accuracy.

(9) In still another embodiment, in any one of the above configurations (1) to (6), a hole punching stage provided on the first mold and upstream in the transport direction with respect to the outer shape stage. A hole punch located at
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The mold part is
An upstream mold apparatus provided with the punching stage;
A downstream mold apparatus that is provided separately from the upstream mold apparatus so as to be positioned downstream of the upstream mold apparatus, and that has the outer shape stage,
The energy irradiation unit is configured to be provided inside the upstream mold apparatus on the downstream side of the punching stage.
According to the configuration of (9) above, the upstream mold apparatus mainly performs hole punching and heating for the purpose of releasing residual stress, and the downstream mold apparatus mainly performs outline cutting. It is like that. That is, the upstream mold apparatus that performs heating for releasing residual stress and the downstream mold apparatus are separated. Therefore, the distance between the upstream mold apparatus and the downstream mold apparatus can be set as appropriate, and the cooling time after the heating can be ensured.

(10) In one embodiment, in any one of the above configurations (1) to (9), an adhesive is provided on the first mold or the second mold for bonding the adjacent core plates together. An adhesive application part for applying an agent to the thin plate is further provided.
In this way, by joining the core plates with an adhesive, the residual stress of the laminated core can be reduced compared to the case of joining by caulking or welding, so that the iron loss of the laminated core can be further reduced. Can do.

(11) In one embodiment, in the configuration of the above (10), the adhesive application unit is positioned on an adhesive application stage on the upstream side in the transport direction with respect to the energy irradiation unit, and inorganic adhesive is used as the adhesive. It is comprised so that an agent may be provided to the said thin plate.
According to the configuration of (11) above, since the thin plate is locally heated after applying the inorganic adhesive, curing of the inorganic adhesive can be promoted. In addition, since the inorganic adhesive is excellent in heat resistance, the core plates can be appropriately joined to each other without impairing the function of the adhesive even when the temperature of the thin plate to which the adhesive is applied is increased.

(12) In some embodiments, in the configuration of (10), the energy irradiation unit is provided on the upstream side of the outer shape stage,
The adhesive application unit is located on an adhesive application stage downstream of the energy irradiation unit and upstream of the outer shape stage, and is configured to apply an organic adhesive as the adhesive to the thin plate. The
According to the configuration of (12) above, since the organic adhesive is applied to the thin plate after the thin plate is heated by the energy irradiation unit, excessive temperature rise of the organic adhesive is prevented, and the function of the adhesive is maintained. Thus, the core plates can be appropriately joined together.

(13) In some embodiments, in any one of the configurations (1) to (12), the energy irradiation unit is configured to irradiate the region with laser light, plasma, or flash lamp light. .
Thereby, it becomes possible to implement the local heating with respect to a thin plate or a core plate in a short time.

(14) In some embodiments, in any one of the above configurations (1) to (13),
A hole punch provided in the first mold and positioned on a hole punch stage on the upstream side in the transport direction with respect to the outer shape stage;
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The energy irradiator is
Irradiating the first energy to the region of the thin plate that is provided on the downstream side of the punching stage and upstream of the external punching stage and in which the residual stress is generated due to the punching process in the punching stage. A first energy irradiation unit for
A second energy irradiator for irradiating a second energy to a region of the core plate that is provided on the outer shape stage and in which the residual stress is generated due to punching in the outer shape stage. .
According to the configuration of (14) above, the first energy irradiation unit provided on the downstream side of the hole punching stage and the upstream side of the outer shape punching stage, and the second energy irradiation unit provided on the outer shape punching stage. Contains. In this way, by performing heating for releasing residual stress in a plurality of times in one line, for example, even when there are a plurality of residual stress generation regions, the time required for each heating step The throughput in manufacturing the laminated core can be improved.

(15) A laminated core manufacturing method according to at least one embodiment of the present invention includes:
A laminated core manufacturing method for manufacturing a laminated core by laminating core plates formed by punching thin plates,
A transport step of transporting the thin plate in the transport direction in a mold part including a first mold and a second mold disposed to face the first mold;
In an outer shape stage, an outer shape punching step of punching the outer shape of the thin plate using an outer shape punch provided in the first die and an outer shape die provided in the second die,
With respect to the region where the residual stress caused by the punching process is generated in the thin plate or the core plate by the energy irradiation unit provided in the mold part on the upstream side of the outer shape stage or the outer shape stage. And a local heating step of selectively irradiating the energy and locally heating the region.

According to the configuration of the above (15), the thin plate or the core plate is heated on the upstream side of the outer shape removal stage or the outer shape removal stage by the energy irradiation unit for the purpose of releasing the residual stress in the laminated core. . Therefore, the residual stress accumulated by the punching process up to the outer shape stage can be released, and the iron loss of the laminated core due to the residual stress can be reduced.
At that time, the energy irradiation unit selectively irradiates energy to a region where residual stress caused by the punching process occurs in the thin plate or the core plate, and locally heats the region. For this reason, compared with the case where a thin plate or a core plate is heated as a whole, the amount of heat input to the mold can be reduced, and a reduction in processing accuracy due to thermal expansion of the mold can be prevented.

  (16) In some embodiments, a laminated core produced by the laminated core producing method described in (15) above is provided.

  According to at least one embodiment of the present invention, the residual stress accumulated in the punching process up to the outer shape stage can be released, and the iron loss of the laminated core due to the residual stress can be reduced. In addition, by locally heating the area of the thin plate or core plate where residual stress occurs, the amount of heat input to the mold can be reduced, preventing deterioration in machining accuracy due to the thermal expansion of the mold. it can.

It is a schematic block diagram which shows the laminated core manufacturing apparatus which concerns on one Embodiment. It is a schematic block diagram which shows the laminated core manufacturing apparatus which concerns on one Embodiment. It is a schematic block diagram which shows the laminated core manufacturing apparatus which concerns on one Embodiment. It is a schematic block diagram which shows the laminated core manufacturing apparatus which concerns on one Embodiment. It is a figure which shows the strip layout of the lamination | stacking core manufacturing apparatus which concerns on one Embodiment. It is sectional drawing which shows the energy irradiation part and its peripheral structure in one Embodiment. It is sectional drawing which shows the energy irradiation part and its peripheral structure in one Embodiment. It is a timing chart which shows an example of energy irradiation.

  Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.

  Initially, with reference to FIGS. 1-4, the structure common to the laminated core manufacturing apparatus 1 which concerns on each embodiment is demonstrated. FIG. 1 is a schematic configuration diagram illustrating a laminated core manufacturing apparatus 1 according to an embodiment. Moreover, FIGS. 2-4 is a schematic block diagram which respectively shows the laminated core manufacturing apparatus which concerns on other embodiment.

  The laminated core manufacturing apparatus 1 according to some embodiments is configured to manufacture a laminated core 120 (see FIG. 1) by laminating core plates 110 formed by punching the hoop material 100. The laminated core 120 obtained by the laminated core manufacturing apparatus 1 is used for electrical equipment such as a motor and a transformer, for example.

As shown in FIGS. 1 to 4, the laminated core manufacturing apparatus 1 includes a mold part including upper molds (first molds) 3, 3 </ b> A, 3 </ b> B and lower molds (second molds) 4, 4 </ b> A, 4 </ b> B. 2 and a transport unit 6 for transporting the hoop material 100 in the transport direction. Various tools including an outer shape punch 31 and an outer shape die 32 described later are incorporated in the mold part 2.
Although details of each embodiment will be described later, in the embodiment shown in FIG. 1 and FIG. 4, the mold unit 2 performs a process from a hole punching process to an outer shape punching process in one mold apparatus. It is the progressive metal mold apparatus comprised. On the other hand, in the embodiment shown in FIG. 2 and FIG. 3, the mold part 2 is a tandem mold in which a plurality of mold apparatuses are combined, and at least two molds are executed in a shared manner from the hole punching process to the outline punching process. Mold devices 2A and 2B are included.

The transport unit 6 is configured to transport the hoop material 100 in the transport direction in the mold unit 2. For example, the transport unit 6 is configured to transport the hoop material 100 at a predetermined feed speed and a predetermined start / stop timing.
The hoop material 100 that is a material of the laminated core 120 is a long thin plate made of, for example, an electromagnetic steel plate, and is wound around the roll 5 before being introduced into the mold part 2. Yes. The transport unit 6 is configured to send the hoop material 100 from the roll 5 to the downstream side in the transport direction at a predetermined feed speed and a predetermined start / stop timing.

The mold part 2 includes upper molds 3, 3A, 3B and lower molds 4, 4A, 4B arranged to face the upper molds 3, 3A, 3B.
As shown in FIGS. 1 to 4, the mold part 2 is provided in the upper molds 3, 3 </ b> A, 3 </ b> B so as to face the outer punch 31 for punching the outer shape of the hoop material 100 and the outer punch 31. And an outer die 32 provided on the lower mold 4, 4A, 4B. The outer shape punch 31 and the outer shape die 32 form an outer shape stage 30 (see FIG. 5) described later. In the outer shape stage 30, the outer shape of the hoop material 100 is punched by the outer shape punch 31 and the outer shape die 32.
Note that the squeeze ring 34 may be provided on the lower mold 4, 4 </ b> A, 4 </ b> B in the outer shape removal stage 30. The squeeze ring 34 is positioned below the outer die 32 and applies a side pressure to the stacked core plates 110 to grip the core plates 110.

Further, in some embodiments, as shown in FIGS. 1 to 4, the mold part 2 includes a punching punch 21 provided in the upper molds 3, 3 </ b> A, 3 </ b> B and lower molds 4, 4 </ b> A, 4 </ b> B. And a hole punching die 22 provided on the surface.
The punching punch 21 and the punching die 22 form a punching stage 10 (see FIG. 5) described later. The hole punching stage 10 is located upstream of the outer shape punching stage 30. In the punching stage 10, punching of pilot holes, slot portions, and the like is performed on the hoop material 100 by the punching punch 21 and the punching die 22.
A plurality of punching stages 10 having different types of holes to be formed are provided in the mold part 2, and a plurality of sets of punching punches 21 and punching dies 22 are provided so as to correspond to the respective punching stages 10. It may be. In this case, according to the shape and size of the hole to be formed, the shape and size of the punching punch 21 and the punching die 22 of each set may be different from each other.

  The mold part 2 may further include a component not shown. For example, in order to prevent the hole-side material from bouncing up in each stage 10, 30 of the mold part 2 in the punching process such as the hole punching process or the outer shape punching process, or the hole side material (hoop) entangled around the punch after the process. A stripper plate (not shown) for stripping the material 100) may be provided.

  Here, an example of the manufacturing process of the laminated core 120 will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a strip layout representing a transition of the progressive processing with respect to the laminated core manufacturing apparatus 1 according to the embodiment. This strip layout is applied to the integrated progressive mold apparatus (mold part 2) shown in FIG. Hereinafter, description will be given using the reference numerals shown in FIG. However, the manufacturing process of the laminated core 120 is not limited to the configuration shown in FIG. 5, and any combination of processes may be used as long as it includes at least the outer shape removing process.

In the example shown in FIG. 5, a hole punching stage 10, an adhesive application stage (adhesive application stage) 16, an idle stage 17, and an outline punching stage 30 are arranged in order from the upstream side in the transport direction. These stages 10, 16, 17, and 30 are provided in the mold part 2, and these stages include tools (a combination of a punching punch 21 and a punching die 22, a punching punch for outer shape) according to the role of each stage. 31 and the outer die 32).
In the exemplary embodiment shown in FIG. 5, the hole punching stage 10 includes a pilot hole punching stage 11, a small hole punching stage 12, a slot hole punching stage 13, and an inner diameter punching stage that are sequentially arranged from the upstream side in the transport direction. 14 is included.

  While the hoop material 100 is intermittently conveyed in the mold part 2 by the conveying unit 6, first, in the pilot hole punching stage 11 of the hole punching stage 10, the pilot is made by the first set of the hole punching punch 21 and the hole punching die 22. The hole 101 is punched. The pilot hole 101 is used to properly position the hoop material 100 by inserting a pilot pin (not shown) provided in the upper mold 3 in a stage downstream of the pilot hole punching stage 11. Provided. After the pilot hole 101 is punched, the hoop material 100 is punched in the small hole 102 in the small hole punching stage 12 by the second set of the punching punch 21 and the punching die 22. Next, with the third and fourth sets of the punching punch 21 and the punching die 22, punching of the slot hole 103 in the slot punching stage 13 and punching of the inner diameter 104 in the inner punching stage 14 are sequentially performed.

An adhesive is applied to the hoop material 100 that has passed through these hole punching stages 10 at an adhesive application stage 16.
For example, in the adhesive application stage 16, it is applied to the lower surface of the hoop material 100. The hoop material 100 to which the adhesive has been applied is conveyed to the next stage in a state where the lower surface is lifted so as not to contact the lower mold 4. For example, the idle stage 17 may be provided as appropriate so that a machining process can be added later. Alternatively, the idle stage 17 may be provided when the tool of the adjacent stage is relatively large (for example, the squeeze ring 34 of the outer shape extraction stage 30) and it is difficult to secure a space for incorporating the tool.
In the outer shape punching stage 30, the outer shape punching of the hoop material 100 is performed by the outer shape punching punch 31 and the outer shape punching die 32, and the core plate 110 is punched into the punching hole 36 of the outer shape punching die 32. The punched core plate 110 is stacked on the core plate 110 that has already been stacked in the squeeze ring 34 (see FIG. 1) located below the outer die 32. At that time, the core plates 110 are bonded to each other by an adhesive, and the laminated core 120 is formed. The laminated core 120 is discharged from the punched hole 36 and is conveyed further downstream by the laminated core conveyance unit 8.
The specific configuration of the outer shape removal stage 30 will be described later.

In the embodiment illustrated in FIG. 5, the outer shape removing process is performed after performing all the processes (for example, the hole punching process and the adhesive application process) except for the outer shape punching process. It is not limited to.
In the exemplary embodiment shown in FIG. 5, the case where the bonding method of the laminated core 120 is bonding has been described. However, the present invention is not limited to this, and other bonding methods such as caulking and welding are adopted. May be. For example, when caulking is employed, the mold apparatus may further include a dowel forming stage for forming dowels (caulking protrusions) on the hoop material. Or when employ | adopting welding joining, the welding process which welds (for example, laser welding) with respect to the laminated core after discharging | emitting from a metal mold | die apparatus may be further provided.

In the laminated core 120 manufactured by the laminated core manufacturing apparatus 1 having the above-described configuration, distortion occurs in the workpiece (the hoop material 100 and the core plate 110) and the stress remains in the manufacturing process.
In particular, in the punching process in the hole punching stage 10, compressive stress and tensile stress may act on the hoop material 100 and the core plate 110 due to shear deformation, and mechanical processing distortion may occur. Of course, residual stress may also occur in processes other than punching. For example, when caulking is adopted as the method for joining the laminated cores 120, compressive stress or tensile stress acts during dowel formation.
According to the knowledge of the present inventors, the iron loss of the laminated core 120 may increase due to the residual stress generated by such processing.

Therefore, in some embodiments, the laminated core manufacturing apparatus 1 includes the following configuration in order to reduce the iron loss of the laminated core 120 due to such residual stress.
As shown in FIGS. 1-4, the laminated core manufacturing apparatus 1 which concerns on some embodiment was provided in the metal mold | die part 2, and was comprised so that the hoop material 100 or the core plate 110 might be irradiated with energy. The energy irradiation part 40, 40A, 40B is provided. The energy irradiation units 40, 40 </ b> A, and 40 </ b> B are disposed in the mold part 2 on the outer shape removal stage 30 or on the upstream side of the outer shape removal stage 30.
In the case where the energy irradiation units 40, 40A, and 40B are additionally installed in the existing design, the energy irradiation units 40, 40A, and 40B are positioned on the upstream side of the outer shape removal stage 30 (see FIG. 5). May be provided. Since the idle stage 17 has a high degree of freedom in layout, it is easy to install the devices of the energy irradiation units 40, 40A, and 40B.

Further, the energy irradiation units 40, 40A, and 40B selectively irradiate energy to a region (residual stress generation region) in which residual stress resulting from punching processing occurs in the hoop material 100 or the core plate 110, The region is configured to be locally heated to relieve residual stress.
The residual stress generation region can be identified from the material and shape of the hoop material 100 or the core plate 110, the specifications of the tools such as the punching punch 21 and the punching die 22 in the laminated core manufacturing apparatus 1, and the punching pressure. For example, the residual stress generation region may be specified by simulation such as FEM structural analysis, may be specified experimentally, or may be specified empirically. Note that the residual stress generation region may include a region in which residual stress is generated due to processing other than punching (for example, dowel formation).

  In one embodiment, the energy irradiation units 40, 40 </ b> A, 40 </ b> B include irradiation units 41, 41 </ b> A, 41 </ b> B and irradiation units 41, 41 </ b> A, 41 </ b> B disposed to face the residual stress generation region of the hoop material 100 or the core plate 110. Energy supply sources 47, 47A, 47B for supplying energy to the control unit 48, and control units 48, 48A, 48B for controlling the energy irradiation timing and the amount of energy to be irradiated. The control units 48, 48 </ b> A, 48 </ b> B are configured to control the energy irradiation timing in accordance with the feed speed and start / stop timing of the hoop material 100 in the transport unit 6.

According to the above embodiment, for the purpose of releasing the residual stress in the laminated core 120, the hoop material 100 or the core plate 110 is upstream of the outer shape removal stage 30 or the outer shape removal stage 30 by the energy irradiation units 40, 40 </ b> A, 40 </ b> B. Is supposed to heat. Therefore, the residual stress accumulated by the punching process up to the outer shape stage 30 can be released, and the iron loss of the laminated core 120 due to the residual stress can be reduced.
At that time, the energy irradiators 40, 40A, 40B selectively irradiate the regions of the hoop material 100 or the core plate 110 where the residual stress caused by the punching process is generated, and locally irradiate the regions. It comes to heat. For this reason, compared with the case where the hoop material 100 or the core plate 110 is heated as a whole, the amount of heat input to the mold part 2 can be reduced, and the processing accuracy is reduced due to the thermal expansion of the mold part 2. Can be prevented. Furthermore, since the amount of heat input from the energy radiating units 40, 40A, 40B with respect to the heat capacity of the entire hoop material 100 or the core plate 110 is smaller than when the hoop material 100 or the core plate 110 is heated as a whole, the cooling time is also reduced. It's short. From these things, it becomes easy to incorporate the energy irradiation part 40 in the mold part 2.

The energy irradiation units 40, 40 </ b> A, 40 </ b> B may be configured to irradiate the residual stress generation region of the hoop material 100 or the core plate 110 with laser light, plasma, or flash lamp light. Thereby, the local heating with respect to the hoop material 100 or the core plate 110 can be implemented in a short time.
1 to 4 and 6 exemplify a configuration using laser light as the energy irradiation units 40, 40A, and 40B, and FIG. 7 illustrates a configuration using a flash lamp as the energy irradiation unit 40. Yes.

In some embodiments, the mold part 2 is further provided with the above-described adhesive application stage 16 as shown in FIGS.
The adhesive application stage 16 stores an adhesive application device (adhesive application unit) 24 for applying an adhesive for bonding the adjacent core plates 110 to the hoop material 100, and an adhesive. And a dispenser 25 configured to supply adhesive to the adhesive applicator 24. For example, the adhesive application device 24 is provided in the lower molds 4, 4 </ b> A, 4 </ b> B so as to apply an adhesive to the lower surface of the hoop material 100 and apply the adhesive to a plurality of locations on the lower surface of the hoop material 100. Composed. The adhesive application device 24 may be provided in the upper molds 3, 3 </ b> A, 3 </ b> B. In this case, the adhesive application device 24 applies an adhesive to the upper surface of the hoop material 100.
The adhesive applied by the adhesive applying device 24 may be liquid or slurry.
The adhesive applied by the adhesive application device 24 may be an inorganic adhesive or an organic adhesive. In the case of an inorganic adhesive, for example, an adhesive containing water glass or colloidal silica as a binder and an oxide such as alumina as an additive is used. In the case of an organic adhesive, for example, an anaerobic adhesive, an epoxy adhesive, or an acrylic adhesive is used. When employing an anaerobic adhesive, a curing accelerator such as aluminum, nickel, or cobalt may be added.
When the adhesive application stage 16 is provided, the residual stress of the laminated core 120 can be reduced by joining the core plates 110 with an adhesive as compared with the case of joining by caulking or welding. Iron loss can be further reduced.

In one embodiment, as shown in FIGS. 1, 2, and 4, the adhesive application device 24 is positioned on the adhesive application stage 16 on the upstream side of the energy irradiation units 40 and 40 </ b> B in the transport direction, and the bonding is performed. The agent application device 24 is configured to apply an inorganic adhesive as an adhesive to the hoop material 100. The energy irradiators 40 and 40B may be provided on the outer shape removal stage 30 or may be provided on the upstream side of the outer shape removal stage 30.
According to this embodiment, since the hoop material 100 is locally heated by the energy irradiated from the energy irradiation units 40 and 40B after applying the inorganic adhesive, curing of the inorganic adhesive can be promoted. . In addition, since the inorganic adhesive is excellent in heat resistance, the core plates 110 can be appropriately joined to each other without impairing the function of the adhesive even when the temperature of the hoop material 100 to which the adhesive is applied is increased.

In another embodiment, as shown in FIG. 3, the adhesive application device 24 is positioned on the downstream side of the energy irradiation unit 40 provided on the upstream side of the outline extraction stage 30 and on the upstream side of the outline extraction stage 30. The adhesive application stage 16 is provided. In this case, the adhesive application device 24 is configured to apply an organic adhesive as an adhesive to the hoop material 100.
According to this embodiment, since the organic adhesive is applied to the hoop material 100 after the hoop material 100 is heated by the energy irradiation unit 40, an excessive temperature rise of the organic adhesive is prevented, and the function of the adhesive is improved. The core plates 110 can be appropriately bonded while being maintained.

As shown in FIG. 1, the laminated core manufacturing apparatus 1 according to an embodiment mainly includes a punching process, heating for releasing residual stress, and an outline punching process in one progressive mold apparatus. Is supposed to do.
That is, in the laminated core manufacturing apparatus 1 shown in FIG. 1, the energy irradiation unit 40 is incorporated in the mold unit 2 provided with both the hole punching stage 10 and the outer shape punching stage 30. In one embodiment, as shown in FIG. 1, the energy irradiation unit 40 is provided in the mold unit 2 in the outer shape stage 30 and configured to irradiate the hoop material 100 or the core plate 110 with energy. In another embodiment, the energy irradiation unit 40 is provided in the mold unit 2 on the upstream side of the outer shape removal stage 30.
In the punching stage 10, a punching punch 21 is provided in the upper mold 3, and a punching die 22 is provided in the lower mold 4. The outline punching stage 30 is disposed on the downstream side of the punching stage 10. In the outer shape removal stage 30, the upper die 3 is provided with an outer shape punch 31, and the lower die 4 is provided with an outer shape die 32.

  According to the above-described embodiment shown in FIG. 1, the entire laminated core manufacturing apparatus 1 can be further downsized, and the throughput in manufacturing the laminated core can be further improved.

As shown in FIG. 2, in the laminated core manufacturing apparatus 1 according to another embodiment, the mold part 2 includes an upstream mold apparatus 2A and a downstream mold apparatus 2B.
The upstream die apparatus 2A is provided with a punching stage 10, and in the punching stage 10, the upper mold 3A of the upstream mold apparatus 2A is provided with a punching punch 21 and the lower mold 4A. Is provided with a punching die 22.
The downstream mold apparatus 2B is provided separately from the upstream mold apparatus 2A so as to be positioned on the downstream side of the upstream mold apparatus 2A, and includes an outer shape removal stage 30. In the outer shape removal stage 30, an outer shape punch 31 is provided in the upper die 3B of the downstream mold apparatus 2B, and an outer shape die 32 is provided in the lower die 4B.

  In the exemplary embodiment shown in FIG. 2, the energy irradiation unit 40 is provided on the outer shape stage 30 inside the downstream mold apparatus 2B. In another embodiment, the energy irradiation unit 40 is provided on the upstream side of the outer shape removal stage 30 inside the downstream mold apparatus 2B.

  As described above, in the exemplary embodiment shown in FIG. 2, the upstream mold apparatus 2A mainly performs punching, and the downstream mold apparatus 2B mainly performs heating for the purpose of releasing residual stress. The outer shape is cut out. That is, since the upstream mold apparatus 2A is separated from the energy irradiation unit 40, there is no heat input from the energy irradiation unit 40 to the upstream mold apparatus 2A, and the upstream mold apparatus 2A. It is possible to prevent a decrease in processing accuracy due to thermal expansion of the steel.

As shown in FIG. 3, in the laminated core manufacturing apparatus 1 according to still another embodiment, the mold part 2 includes an upstream mold apparatus 2A and a downstream mold apparatus 2B.
The upstream die apparatus 2A is provided with a punching stage 10, and in the punching stage 10, the upper mold 3A of the upstream mold apparatus 2A is provided with a punching punch 21 and the lower mold 4A. Is provided with a punching die 22.
The downstream mold apparatus 2B is provided separately from the upstream mold apparatus 2A so as to be positioned on the downstream side of the upstream mold apparatus 2A, and includes an outer shape removal stage 30. In the outer shape removal stage 30, an outer shape punch 31 is provided in the upper die 3B of the downstream mold apparatus 2B, and an outer shape die 32 is provided in the lower die 4B.

The energy irradiation unit 40 is configured to be provided inside the upstream mold apparatus 2 </ b> A on the downstream side of the punching stage 10. In the illustrated example, the energy irradiation unit 40 is provided in the upper mold 3A in the upstream mold apparatus 2A, and energy is directed downward (including a case where the energy irradiation unit 40 is inclined with respect to the vertical direction). It is arranged to irradiate. However, the energy irradiation unit 40 is provided in the lower mold 4A in the upstream mold apparatus 2A, and is arranged so as to irradiate energy upward (including a case where the energy is inclined with respect to the vertical direction). May be.
The upstream mold apparatus 2A mainly performs hole punching and heating for the purpose of releasing the residual stress, and the downstream mold apparatus 2B mainly performs outline punching. That is, the upstream mold apparatus 2A and the downstream mold apparatus 2B for heating for the purpose of releasing the residual stress are separated from each other. Therefore, the distance between the upstream mold apparatus 2A and the downstream mold apparatus 2B can be set as appropriate, and the cooling time after the heating can be ensured.
2 and 3, at least one of the upstream mold apparatus 2A and the downstream mold apparatus 2B is a progressive mold apparatus that performs a plurality of steps in the mold.

In the above-described embodiment illustrated in FIGS. 1 to 3, the configuration in which one energy irradiation unit 40 is provided in the mold part 2 is illustrated, but as illustrated in FIG. 4, a plurality of energy irradiations are performed on the mold part 2. Parts 40A and 40B may be provided.
In the exemplary embodiment shown in FIG. 4, a first energy irradiation unit 40 </ b> A and a second energy irradiation unit 40 </ b> B are provided as the energy irradiation unit 40. The first energy irradiation unit 40A is provided on the downstream side of the punching stage 10 and on the upstream side of the outer punching stage 30, and for the thin plate region where residual stress is generated due to the punching process in the punching stage 10 And configured to irradiate the first energy. In the illustrated example, the first energy irradiating unit 40A is provided in the upper mold 3 of the mold unit 2, and the energy is directed downward (including a case where the first energy irradiation unit is inclined with respect to the vertical direction). It is arranged to irradiate. However, 40 A of 1st energy irradiation parts are provided in the lower metal mold | die 4 among the metal mold | die parts 2, and are arrange | positioned so that energy may be irradiated toward upper direction (including the case where it inclines with respect to a perpendicular direction). May be. The second energy irradiation unit 40B is provided in the outer shape stage 30 and configured to irradiate the second energy to the region of the core plate 110 where the residual stress is generated due to the punching process in the outer shape stage 30. The
According to this configuration, the first energy irradiation unit 40A located on the downstream side of the hole punching stage 10 and the upstream side of the outline punching stage 30 and the second energy irradiation unit 40B located on the outline punching stage 30 Heating for the purpose of releasing the residual stress is performed a plurality of times. In this way, by performing heating for releasing residual stress in a plurality of times in one line, for example, even when there are a plurality of residual stress generation regions, the time required for each heating step The throughput in manufacturing the laminated core can be improved.

Next, with reference to FIG.6 and FIG.7, the more concrete structure of the energy irradiation part 40 is demonstrated.
6 and 7 show a configuration in which the energy irradiation unit 40 is provided in the outer shape removal stage 30. FIG. FIG. 6 is a cross-sectional view showing the energy irradiation unit 40 and its peripheral structure in one embodiment, and illustrates a configuration using a laser beam irradiation unit as the energy irradiation unit 40. FIG. 7 is a cross-sectional view showing the energy irradiation unit 40 and its peripheral structure in another embodiment, and illustrates a configuration using a flash lamp 46 as the energy irradiation unit 40.

In each embodiment shown in FIGS. 6 and 7, the upper die 3 in the outer shape stage 30 is provided with an outer shape punch 31 that can be operated in the vertical direction, and the lower die 4 has an outer shape punch. An outer die 32 is provided opposite to 31.
The outer punch 31 includes a punch body 31 a having a blade 31 b for punching the outer shape of the hoop material 100. The punch body 31a is formed of, for example, a carbide member. The blade 31b is provided on at least a part of the outer periphery of the punch body 31a. The outer punch 31 is configured to punch the outer shape of the hoop material 100 by repeating reciprocating motion between a top dead center farthest from the outer punch 32 and a bottom dead center located inside the outer punch 32. Has been.
The outer die 32 has a die main body 32a and a blade 32b provided on at least a part of the outer periphery of the die main body 32a for punching the outer shape of the hoop material 100. In the center of the outer punching die 32, a punching hole 36 in which the outer punch 31 and the core plate 110 punched by the outer punching die 32 are stacked is formed.

  Further, a squeeze ring 34 for supporting the punched core plate 110 is disposed below the outer die 32 and around the punch hole 36 in the lower die 4. The squeeze ring 34 applies a side pressure to grip the core plate 110 group. When a predetermined number of core plates 110 are stacked, the side pressure is released and the stacked core 120 is discharged downward. If necessary, a bottom plate (not shown) may be provided below the squeeze ring 34 to support the laminated core 120 from the lower surface. In this case, the bottom plate is configured such that a predetermined number of core plates 110 are stacked, and the side pressure of the squeeze ring 34 is lowered at the same time that the stacked core 120 is discharged from below.

As shown in FIG. 6, in one embodiment, the energy irradiation unit 40 is provided on the opposite side of the outer shape die 32 with the front end surface of the outer shape punch 31 in the outer shape stage 30. The energy irradiation unit 40 is configured to irradiate the residual stress generation region of the hoop material 100 or the core plate 110 through the outer shape punch 31.
Further, an opening 31c may be provided at the center of the punch body 31a of the outer punch 31. In this case, the energy from the energy irradiation unit 40 may pass through the opening 31c and reach the residual stress generation region of the hoop material 100 or the core plate 110. Furthermore, it is good also as a structure by which the permeation | transmission member 38 which can permeate | transmit the energy irradiated from the energy irradiation part 40 was attached to the punch main body 31a so that the opening 31c may be plugged up. In this case, the transmissive member 38 is disposed on the inner peripheral side of the punch body 31a so as to be surrounded by the punch body 31a. From the viewpoint of positioning the transmissive member 38 with respect to the punch body 31a, as shown in FIG. 6, the transmissive member 38 may be in-row fitted to the punch body 31a.

According to the above-described embodiment, the energy irradiation unit 40 is provided on the opposite side of the outer punching die 32 with the front end surface of the outer punching punch 31 interposed therebetween, so as to irradiate the region with energy through the outer punching punch 31. With this configuration, it is possible to effectively irradiate energy to the residual stress generation region without being obstructed by the outer punch 31 in operation. Thereby, the residual stress generation region can be quickly heated up to a high temperature region where an annealing effect can be expected, and the time required for the heating process by the energy irradiation unit 40 can be shortened.
Further, since the energy is irradiated through the opening 31c of the outer punch 31, the energy irradiation unit 40 can be disposed behind the outer punch 31 when viewed from the energy irradiation target (the hoop material 100). The degree of freedom of arrangement of the irradiation unit 40 is increased.
Furthermore, if the transmitting member 38 is attached so as to close the opening 31c formed in the outer punch 31, energy can be irradiated through the outer punch 31 while suppressing a decrease in rigidity of the outer punch 31. .

In the said embodiment, the front end surface 200 of the punch main body 31a and the front end surface 210 of the permeation | transmission member 38 may exist on the same plane. Thereby, since there is no step at the boundary between the tip surface 200 of the punch body 31a and the tip surface 210 of the transmission member 38, it is possible to prevent deformation due to the step of the core plate 110 obtained by removing the outer shape.
In this specification, “the tip surface 200 of the punch body 31a and the tip surface 210 of the transmission member 38 are“ on the same plane ”means that both tip surfaces are the same in a geometrically strict sense. In addition to the case where the two end surfaces 200 and 210 exist on substantially the same plane as long as they do not hinder the suppression of the deformation of the core plate 110 during the outer shape punching of the hoop material 100, both This includes the case where the position is slightly shifted.

In the exemplary embodiment shown in FIG. 6, the energy irradiation unit 40 includes an optical fiber (irradiation unit) 41 for guiding laser light. Most of the optical fiber 41 except the tip is covered with a protective resin layer to form an optical fiber cable 42. The tip of the optical fiber 41 is not covered with a protective resin layer, and laser light can be irradiated from this point. The optical fiber cable 42 is connected to a laser light source as an energy supply source 47 (see FIGS. 1 to 4). The laser beam generated by the energy supply source (laser light source) 47 is guided to the irradiation start point of the laser beam (the tip of the optical fiber 41) via the optical fiber cable. The distal end portion of the optical fiber 41 is located on the opposite side of the outer punching die 32 with the distal end surface of the outer punching punch 31 in between.
The tip of the optical fiber 41 may be fixed to the outer punch 31. In the example shown in FIG. 6, the tip of the optical fiber 41 is attached to a transmission member 38 that closes the opening 31 c of the outer punch 31 through a holder 44. The holder 44 is configured to fix the distal end portion of the optical fiber 41 to the transmission member 38 by engaging with a recess provided in the transmission member 38.

  As shown in FIG. 7, the energy irradiation unit 40 according to another embodiment has a configuration in which the energy irradiation unit 40 includes a flash lamp 46. The flash lamp 46 is provided in the lower mold 4 so as to be positioned below the outer die 32 and the squeeze ring 34. When the laminated core 120 is discharged downward, energy is applied to the residual stress generation region from the side. According to this embodiment, since the energy irradiation part 40 can be arrange | positioned to the fixing | fixed site | part of the lower metal mold | die 4, simplification of an apparatus structure can be achieved.

  FIG. 8 is a timing chart showing an example of energy irradiation. This timing chart is applied to, for example, the embodiment shown in FIG. 6 (configuration in which the energy irradiation unit 40 is provided in the outer punch 31). In the following description, the reference numerals shown in FIG. 1 to FIG. 4 or FIG. 6 are used.

In one embodiment, the outer shape punch 31 repeats a reciprocating motion between a top dead center farthest from the outer shape die 32 and a bottom dead center located inside the outer shape die 32, whereby the outer shape of the hoop material 100. It is configured to punch out. In the example shown in FIG. 8, the outline punch 31 moves toward the bottom dead center after reaching the top dead center at time t _t and reaches the bottom dead center at time t _b .
The conveyance unit 6 is configured so that only at least a part of the period in which the outer punch 31 is positioned closer to the top dead center than the hoop material 100 (the period in which the tip surface of the outer punch 31 is positioned above the hoop material 100). The hoop material 100 is intermittently conveyed so that 100 moves in the conveyance direction. That is, at time t _b contour punching punch 31 is positioned at the bottom dead center, because the hoop material 100 is external vent punch 31 is in a state passing through, transport hoops 100 is stopped. The outer shape punch 31 is separated from the hoop material 100 when the outer shape punch 31 is located closer to the top dead center than the hoop material 100, and the conveying unit 6 sends out the hoop material 100 during this period. It has become.
Specifically, the pilot pin is pulled out from the pilot hole 101 (see FIG. 5) of the hoop material 100 at time t ₁ within a period in which the outer punch 31 is located closer to the top dead center than the hoop material 100. Immediately after this time t ₁ , the transport unit 6 starts transporting the hoop material 100. Then, at time t ₂ when the hoop material 100 moves by a distance between adjacent stages (that is, when the hoop material 100 reaches the next stage), the transport unit 6 stops transporting the hoop material 100. Thereafter, the pilot pin of the next stage is again inserted into the pilot hole 101 of the hoop material 100 to position the hoop material 100. After the positioning, the outer punch 31 is lowered to the bottom dead center and punches the core plate 110.

The energy irradiating unit 40 is from the time t2 when the conveyance of the hoop material 100 by the conveyance unit 6 is stopped to the second time t5 when the conveyance of the hoop material 100 by the conveyance unit 6 is started, that is, the hoop material 100 is stopped. The core plate 110 is configured to irradiate energy during at least a part of the period.
Further, in the state where the outer punch 31 and the transport unit 6 are operating in synchronization as described above, in the energy irradiation unit 40, the blade 31b of the outer punch 31 and the blade 32b of the outer punch 32 are the same. Energy is applied to the core plate 110 in at least a part of a period from the first time point t2 immediately before passing through the bottom dead center, which is the height, to the second time point t5 when the transport of the hoop material 100 is started by the transport unit 6. It may be configured as follows. In this case, in the example shown in FIG. 8, the irradiation end point t4 between the bottom dead center passage time tb and the second time point t5 from the irradiation start point t3 between the first time point t2 and the bottom dead center passage time tb. The period up to is the energy irradiation period.
According to the above-described embodiment, the energy is applied to the core plate 110 at the time when the hoop material 100 is stopped or before or after the outer shape is removed. Can accurately irradiate energy.

  As described above, according to the embodiment of the present invention, it is possible to release the residual stress accumulated in the punching process up to the outline punching stage 30, and to reduce the iron loss of the laminated core 120 due to the residual stress. Can do. Further, by locally heating the region of the hoop material 100 or the core plate 110 where the residual stress is generated, the amount of heat input to the mold part 2 can be reduced, resulting from the thermal expansion of the mold part 2. It is possible to prevent a decrease in machining accuracy.

The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expression “comprising”, “including”, or “having” one constituent element is not an exclusive expression that excludes the presence of the other constituent elements.

1 Stacked core manufacturing equipment 2 Progressive die equipment (die part)
2A Upstream mold apparatus 2B Downstream mold apparatus 3, 3A, 3B Upper mold 4, 4A, 4B Lower mold 5 Roll 6 Conveying part 10 Hole punching stage 11 Pilot hole punching stage 12 Small hole punching stage 13 Slot hole punching Stage 14 Inner diameter punching stage 16 Adhesive application stage 17 Idle stage 21 Hole punch 22 Hole punch die 24 Adhesive application device 25 Dispenser 30 External punch stage 31 External punch 31a Punch body 31b Blade 31c Opening 32 External punch die 32a Die body 32b Blade 34 Squeeze ring 36 Punching hole 38 Transmission member 40 Energy irradiation unit 41 Irradiation unit 42 Optical fiber cable 46 Flash lamp 47 Energy supply source 48 Control unit 100 Hoop material 110 Core plate 120 Multilayer core

Claims (15)

A laminated core manufacturing apparatus for manufacturing a laminated core by laminating core plates formed by punching thin plates,
A mold part including a first mold and a second mold disposed opposite to the first mold;
A transport unit for transporting the thin plate in the transport direction in the mold part;
An outer punch for punching the outer shape of the thin plate provided in the first mold;
An outer die that is provided in the second die so as to face the outer punch, and forms the outer punch stage together with the outer punch;
The outer shape stage, or provided in the mold part on the upstream side of the outer shape stage, and an energy irradiation unit for irradiating the thin plate or the core plate with energy,
The energy irradiation unit selectively irradiates the energy to a region of the thin plate or the core plate where the residual stress caused by punching has occurred, and locally heats the region to apply the residual stress. A laminated core manufacturing apparatus configured to be released.   The energy irradiation unit is provided on the opposite side of the outer punching die across the tip surface of the outer punch in the outer punching stage, and passes the energy through the at least part of the outer punch. The laminated core manufacturing apparatus according to claim 1, wherein the laminated core manufacturing apparatus is configured to irradiate a laser beam.   The laminated core manufacturing apparatus according to claim 2, wherein an opening through which the energy can pass is formed in the outer punch. The outer punch is
A punch main body provided with the opening and having a blade for punching the outer shape of the thin plate at least at a part of the outer periphery;
The laminated core manufacturing apparatus according to claim 3, further comprising: a transmissive member attached to the punch main body so as to close the opening and capable of transmitting the energy.   The laminated core manufacturing apparatus according to claim 4, wherein the front end surface of the punch body and the front end surface of the transmission member are on the same plane. The outline punch is configured to punch out the outline of the thin plate by repeating reciprocating motion between a top dead center farthest from the outline punch die and a bottom dead center located inside the outline punch die. ,
The transport unit intermittently transports the thin plate so that the thin plate moves in the transport direction only during at least a part of a period in which the outer punch is located closer to the top dead center than the thin plate. Configured,
The said energy irradiation part is comprised so that the said plate may be irradiated with the said energy in at least one part of the period when the said thin plate has stopped at the said external shape stage. The laminated core manufacturing apparatus according to any one of the above. A hole punch provided in the first mold and positioned on a hole punch stage on the upstream side in the transport direction with respect to the outer shape stage;
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The laminated core manufacturing apparatus according to any one of claims 1 to 6, wherein the mold part is a progressive mold apparatus provided with both the hole punching stage and the outer shape punching stage. A hole punch provided in the first mold and positioned on a hole punch stage on the upstream side in the transport direction with respect to the outer shape stage;
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The mold part is
An upstream mold apparatus provided with the punching stage;
A downstream mold apparatus that is provided separately from the upstream mold apparatus so as to be positioned downstream of the upstream mold apparatus, and that has the outer shape stage,
The said energy irradiation part was provided in the upstream of the said outline extraction stage or the said outline extraction stage in the inside of the said downstream die apparatus, The Claim 1 thru | or 6 characterized by the above-mentioned. The laminated core manufacturing apparatus as described. A hole punch provided in the first mold and positioned on a hole punch stage on the upstream side in the transport direction with respect to the outer shape stage;
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The mold part is
An upstream mold apparatus provided with the punching stage;
A downstream mold apparatus that is provided separately from the upstream mold apparatus so as to be positioned downstream of the upstream mold apparatus, and that has the outer shape stage,
The laminated core manufacturing apparatus according to claim 1, wherein the energy irradiation unit is provided inside the upstream mold apparatus at a downstream side of the punching stage.   The adhesive is provided to the first mold or the second mold, and further includes an adhesive application portion for applying an adhesive for bonding the adjacent core plates to the thin plate. The laminated core manufacturing apparatus according to any one of 1 to 9.   The adhesive application part is located on an adhesive application stage upstream of the energy irradiation unit in the transport direction, and is configured to apply an inorganic adhesive as the adhesive to the thin plate. The laminated core manufacturing apparatus according to claim 10. The energy irradiation unit is provided on the upstream side of the outer shape stage,
The adhesive application unit is located on an adhesive application stage downstream of the energy irradiation unit and upstream of the outer shape stage, and is configured to apply an organic adhesive as the adhesive to the thin plate. The laminated core manufacturing apparatus according to claim 10, wherein:   The laminated core manufacturing apparatus according to any one of claims 1 to 12, wherein the energy irradiation unit is configured to irradiate the region with laser light, plasma, or flash lamp light. A hole punch provided in the first mold and positioned on a hole punch stage on the upstream side in the transport direction with respect to the outer shape stage;
A punching die provided on the second mold so as to face the punching punch and forming the punching stage together with the punching punch;
The energy irradiator is
Irradiating the first energy to the region of the thin plate that is provided on the downstream side of the punching stage and upstream of the external punching stage and in which the residual stress is generated due to the punching process in the punching stage. A first energy irradiation unit for
A second energy irradiator for irradiating a second energy to a region of the core plate that is provided on the outer shape stage and in which the residual stress is generated due to punching in the outer shape stage. The laminated core manufacturing apparatus according to any one of claims 1 to 13, wherein the apparatus is a laminated core manufacturing apparatus. A laminated core manufacturing method for manufacturing a laminated core by laminating core plates formed by punching thin plates,
A transport step of transporting the thin plate in the transport direction in a mold part including a first mold and a second mold disposed to face the first mold;
In an outer shape stage, an outer shape punching step of punching the outer shape of the thin plate using an outer shape punch provided in the first die and an outer shape die provided in the second die,
With respect to the region where the residual stress caused by the punching process is generated in the thin plate or the core plate by the energy irradiation unit provided in the mold part on the upstream side of the outer shape stage or the outer shape stage. And a local heating step of selectively irradiating the energy and locally heating the region.

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