JP2008278610A - Progressive die assembly for manufacturing laminated core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a progressive die assembly for manufacturing laminated cores wherein a relatively simple and inexpensive configuration is adopted but yet laminated cores can be smoothly manufactured. <P>SOLUTION: A blank die 13 is constructed of: a die portion 31 for punching core thin plates 17, 18 out of a hoop material W; and a squeeze ring portion 32 that is so formed that it continues to the die portion 31 and gives lateral pressure to the punched-out core thin plates 17, 18. In the squeeze ring portion 32, the following straight portions are formed: straight portions 34, 35 that are in slidable contact with the magnetic pole portions 17a, 18a of the core thin plates 17, 18 and are formed flush with the inner surface of the die portion 31; a straight portion 36 that is in slidable contact with the yoke portions 17b, 18b of the core thin plates 17, 18 and is formed flush with the inner surface of the die portion 31; and a straight portion 37 that is in slidable contact with the inside diameter portions 17c, 18c of the core thin plates 17, 18 and is formed flush with the inner surface of the die portion 31. The remaining portions other than the straight portions 34 to 37 are escape portions 38 forming a taper gently widened downward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a progressive mold apparatus for manufacturing a laminated core such as a motor core, and more particularly to a technique that enables a smooth production of a laminated core while adopting a relatively simple and low-cost configuration.

  A laminated iron core used for an electric motor core or the like is usually punched out continuously from a hoop material (strip-shaped steel plate) of an electromagnetic steel plate by an upper die punch and a lower die installed in a progressive die, It is manufactured by punching out a thin plate-shaped outer shape in the final process, drawing out the iron core thin plate with the outer shape punched out into a die, fixing them integrally while sequentially laminating them, and taking them out as a laminated core every predetermined number of sheets. In such a progressive die, as a means for integrally / fixing the iron core thin plates, caulking means (caulking convex portions or caulking concave portions) by, for example, half-punching are formed on the front and back of the same position on each iron thin plate. A method of joining / integrating overlapping core thin plates by caulking them into the recesses (caulking joining method), and punching out the outer shape of the core thin plate in the final process, and sequentially drawing out the core thin plates punched out of the outer shape into the die In this case, a method (welding method) for joining / integrating overlapping iron core thin plates by irradiating a laser beam with a laser welding device arranged in a lower mold on the outer periphery of the laminated thin iron core plates Before punching the outer periphery of the core thin plate, apply an adhesive to a predetermined position (upper surface or lower surface) of the core thin plate shape, When elaborate vent into the die, a method of coupling / integrated to by pressing the (adhesive bonding method) is known in the overlapping core sheet the core sheet coming to be stacked descends.

  In the progressive die using these various coupling methods, in the case of the caulking coupling method, the iron core thin plate previously punched in the outer shape is held in place in order to ensure that the above-mentioned caulking convex portion is press-fitted into the caulking concave portion. A holding means for holding with force is required. Also in the welding connection method, since the punched iron core thin plates are welded in close contact with each other, a holding means for holding the iron core thin plate that has been punched out on the die side with a predetermined holding force is required. Similarly, in the adhesive bonding method, in order to bond the punched iron core thin plates in close contact with each other, it is necessary to have a holding means for holding the core thin plates that have been punched out on the die side with a predetermined holding force. Become.

As such a holding means, a hydraulically driven or mechanically driven cradle is disposed below the outer punching die, and the iron core thin plate is supported by this cradle (referred to as cradle system or back pressure system): Patent Literature 1) and a squeeze ring (holding ring) having a holding hole having the same shape as the outer punching die (or a shape slightly smaller than the die punching hole) below the outer punching die. It is well known that a lateral pressure (friction force between the outer peripheral surface of the iron core thin plate and the inner peripheral surface of the squeeze ring) is imparted to the iron core thin plate that is pulled out by the squeeze ring (see Patent Document 2). Yes.
Japanese Patent No. 2552965 JP 2004-328974 A

  The cradle type progressive die gives a large holding force to the core thin plate, so that the core thin plate can be securely connected, but the cradle is retracted when the finished laminated core is unloaded from the progressive die. There is a problem that the configuration of the apparatus is complicated and a lot of time and cost are required for production and maintenance.

  On the other hand, in the squeeze ring type progressive die, there is no moving part like the cradle type, so the problems related to the production and maintenance mentioned above do not occur, but the external punching die and the squeeze ring are separate. There was another kind of problem due to In other words, since the shape and size of the punching hole of the outer punching die and the holding hole of the squeeze ring are almost the same, if the outer punching die and the squeeze ring are slightly displaced, the iron core sheet punched by the outer punching die is There is a risk that the squeeze ring may not enter smoothly, or the lateral pressure applied to the iron core thin plate may be uneven. Therefore, when manufacturing a progressive die, a skilled worker must strictly align the outer punching die and the squeeze ring one by one, resulting in an increase in manufacturing cost and a decrease in productivity. It had been.

  On the other hand, there are some squeeze ring type progressive molds that incorporate a plurality of inserts (side pressure pieces) in the squeeze ring and adjust the side pressure by putting these inserts in and out of the squeeze ring. However, even in such a progressive die, if the fine adjustment of the side pressure is not complete, the finished laminated iron core will be slightly tilted, the perpendicularity will be out of the allowable range, and it will be laminated in the external punching die or squeeze ring. There was a risk of clogging the iron core.

  The present invention has been made in view of such a background, and provides a progressive mold apparatus for manufacturing a laminated core that enables smooth production of the laminated core while adopting a relatively simple and low-cost configuration. With the goal.

  In the invention of claim 1, the outer shape of the iron core thin plate is punched out into the die, and the pressing force is applied in the stacking direction by applying a side pressure to the iron core thin plate extracted in the squeeze ring arranged following the die. This is a progressive die device of the applying method, in which the outer punching die and the squeeze ring are integrally formed, and a punching hole corresponding to a squeeze ring following a punching hole portion of a predetermined depth constituting a die for punching the outer shape. In the portion, a relief portion is formed in a part of the inner peripheral shape in the drawing direction, and a side pressure is applied to the iron core thin plate drawn out by the remaining straight portion.

  According to the first aspect of the present invention, since the outer shape punching die and the squeeze ring as the side pressure applying means are integrally formed, the alignment work required in the conventional apparatus is not necessary, and the number of components is reduced. Decreases, and various problems caused by misalignment do not occur. In addition, when the present invention is applied to a caulking and joining type progressive die apparatus, the holding force due to the side pressure tends to more strongly act on the caulking portion, thereby realizing smooth joining / integration. Further, even when the present invention is applied to a progressive joining die apparatus of a welding connection method or an adhesive connection method, the adhesiveness between overlapping iron core thin plates is increased, and a laminated iron core with higher bondability can be provided.

  Hereinafter, an embodiment of a progressive metal mold apparatus (laminated core manufacturing apparatus) to which the present invention is applied will be described in detail with reference to the drawings. In addition, the progressive metal mold | die of embodiment manufactures the division | segmentation type | mold laminated iron core used for the stator (stator) of an electric motor.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing an outer diameter punching portion of a progressive die apparatus according to the first embodiment, and FIG. 2 is a perspective view showing a laminated iron core according to the first embodiment. 3 is a plan view of the outer punching die according to the first embodiment, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 shows the inner surface of the outer punching die according to the first embodiment. It is a perspective view shown.

<Configuration of First Embodiment>
As shown in FIG. 1, a progressive die apparatus 1 according to the first embodiment includes an outer punching punch (hereinafter simply referred to as an outer punch) 11 held by an upper die 3 at an outer diameter punching portion 2 thereof, A stripper plate 12 that descends along with the outer shape punch 11 and presses the hoop material (strip-shaped steel plate) W and an outer shape punching die (hereinafter simply referred to as an outer shape die) 13 held by the lower die 4 are provided. A plurality of columns 14 are erected on the upper surface of the lower die 4, and the upper die 3 and the stripper plate 12 are guided by these columns 14 and slide up and down. The outer die 13 is fixed to the lower die 4 by a die plate 15 fastened to the lower die 4.

  As shown in FIG. 2, the laminated iron core 16 has a magnetic pole part 16a on which a winding (not shown) is provided, and an arcuate yoke part (yoke) 16b that forms an outer peripheral side portion. It is manufactured by laminating / integrating the iron core thin plates 17 and the second and subsequent iron core thin plates 18 in the outer die 13. The first iron core thin plate 17 has measuring holes (through holes) 19a and 19b formed in the magnetic pole portion 17a and the yoke portion 17b, respectively. Further, the second and subsequent iron core thin plates 18 are formed with caulking convex portions 20a and 20b and caulking concave portions 21a and 21b on the magnetic pole portion 18a and the yoke portion 18b, respectively.

  As shown in FIGS. 3 to 5, the external die 13 has a substantially rectangular parallelepiped shape, and is formed subsequent to the die portion 31 for punching the iron core thin plates 17 and 18 from the hoop material W, and the die portion 31. The squeeze ring portion 32 applies a side pressure to the punched iron core thin plates 17 and 18. A die hole 33 having the same shape as the outer shape of the iron core thin plates 17 and 18 is formed in the die portion 31. Further, the squeeze ring portion 32 has a plurality of locations on the outer peripheral side surfaces of the iron core thin plates 17, 18, and in the first embodiment, is slidably contacted with the magnetic pole portions 17 a, 18 a and is formed in the same plane as the inner surface of the die portion 31. The straight portions 36 that are in sliding contact with the yoke portions 17b and 18b of the core thin plates 17 and 18 and are flush with the inner surface of the die portion 31, and the inner diameter portions 17c of the core thin plates 17 and 18; The straight part 37 formed in the same plane as the inner surface of the die part 31 is formed in sliding contact with 18c, and is used for applying a lateral pressure. And except these straight parts 34-37, it is the escape part 38 which makes the gentle taper which expands below.

<Operation of First Embodiment>
When the progressive die apparatus 1 starts operating, the hoop material W enters the outer diameter punched portion 2 after being subjected to various punching and half punching processes while being intermittently fed within the progressive die apparatus 1. When the upper die 3 is lowered in the outer diameter punching portion 2, the outer punch 11 is fitted into the outer die 13 after the hoop material W is sandwiched between the stripper plate 12 and the lower die 4 as shown in FIG. The core thin plates 17 and 18 are sequentially punched from the hoop material W.

  As shown in FIG. 7 (enlarged view of the VII portion in FIG. 6), the second and subsequent iron core thin plates 18 drawn into the outer die 13 are squeezed by the iron core thin plates 17 and 18 drawn so far. Since it is pushed down by the outer shape punch 11 on the upper surface held in a state where the side pressure is applied by the straight portions 34 to 37 formed on the inner periphery of the ring portion 32, the pushing force and the straight portions 34 The caulking convex portions 20a and 20b are firmly fitted into the measuring holes 19a and 19b and the caulking concave portions 21a and 21b by the side pressure applied to the side surfaces of the iron core thin plates 17 and 18 stacked in the inner portion 37. At this time, since the straight portions 34 to 37 are integrally formed with the die portion 31, there is no step between the die portion 31 and the straight portions 34 to 37, and the iron core thin plates 17 and 18 are smooth. Progress (downward) is realized.

  As shown in FIG. 8 (VIII-VIII cross-sectional view in FIG. 7), the side pressure is near the position where the caulking portions (metering holes 19a, caulking convex portions 20a, caulking concave portions 21a) of the iron core thin plates 17 and 18 are formed. By arranging the straight portions 34 to 37 for imparting squeezing force, a pressing force (caulking force) can be effectively applied to the caulking portion. That is, the straight portions 34 and 35 are provided in the vicinity of the caulking portions (the measurement holes 19a, the caulking convex portions 20a, and the caulking concave portions 21a) of the iron core thin plates 17 and 18 on the magnetic pole portions 17a and 18a side. Is provided in the vicinity of the caulking portions (measuring holes 19b, caulking convex portions 20b, caulking concave portions 21b) of the iron core thin plates 17 and 18 on the side of the yoke portions 17b and 18b. The first iron core thin plate 17 is punched with measuring holes 19a and 19b every predetermined number of sheets (in this embodiment, 12 sheets) from the hoop material W, thereby determining the laminated thickness.

  In the first embodiment, by adopting the above-described configuration, it becomes unnecessary to align the outer shape punching die and the squeeze ring, which was necessary when manufacturing the progressive die, which has been a problem in the conventional apparatus, The number of component parts is reduced, and various problems caused by misalignment between the outer punching die and the squeeze ring are not generated. In addition, since only the partial inner surface of the squeeze ring portion 32 is formed as the straight portions 34 to 37 for applying the side pressure, the side pressure effectively acts on the laminated iron core thin plates 17 and 18 and is more closely attached. The effect of improving the property was also obtained.

  Note that the configuration of the first embodiment can also be applied to the above-described adhesive bonding type progressive die apparatus. That is, in the case of an adhesive bond type progressive die apparatus, an adhesive is applied to a predetermined location on the upper surface or the lower surface of the iron core thin plates 17 and 18 in a step prior to the outer shape punching step, and the outer die 13 is formed in the outer shape punching step. When the iron core thin plates 17 and 18 are pulled out, the iron core thin plates 17 and 18 are brought into close contact with each other by applying a lateral pressure by the squeeze ring portion 32.

[Second Embodiment]
FIG. 9 is a longitudinal sectional view showing an outer diameter punching portion of the progressive die apparatus according to the second embodiment. In the second embodiment, the present invention is applied to a welding die type progressive die apparatus, and the overall configuration is substantially the same as that of the first embodiment described above. When attached, redundant description is omitted.

  As shown in FIG. 9, the outer die 13 is formed with a plurality of through holes 50 (only one is shown in FIG. 9) penetrating the inner peripheral surface of the squeeze ring portion 32. An optical fiber injection unit 51 for irradiating laser light is embedded in the lower mold 4. A laser oscillator 53 controlled by a laser controller 52 is connected to the optical fiber injection unit 51 so that the inner periphery of the squeeze ring portion 32 is irradiated with laser light.

  In the second embodiment, the iron core thin plates 17 and 18 are driven into the outer die 13 and stacked, and when the iron core thin plates 17 and 18 are lowered to the position of the optical fiber injection unit 51 in the squeeze ring portion 32 of the outer die 13, they overlap. , 18 is irradiated / integrated with a laser beam, and the laser beam is irradiated one by one or every predetermined number depending on the spot diameter of the irradiated portion and the thickness of the iron core thin plates 17, 18. By doing so, a laminated iron core can be manufactured.

[Partial modification]
FIG. 10 is a longitudinal sectional view of an external punching die according to a partially modified example. The partial modification is obtained by changing only the shape of the relief portion of the outer punching die from the above embodiment. That is, in the above-described embodiment, the escaping portion having a gentle taper extending downward from the lower end of the die portion is employed. An escape portion 138 having the same depth is formed.

  This is the end of the description of the specific embodiments and some variations, but the aspects of the present invention are not limited to these embodiments and some variations. For example, in the above embodiment, the present invention is applied to an apparatus for manufacturing a split laminated core for a stator of an electric motor. However, the present invention is applied to an apparatus for manufacturing a split stacked core for an electric motor rotor. Alternatively, the present invention may be applied to an apparatus for manufacturing a split laminated core for a generator stator or rotor. In the above embodiment, the present invention is applied to an apparatus for manufacturing a split-type laminated core having a single magnetic pole portion. However, the present invention is a split-type including a plurality of (for example, 2 to 4) magnetic pole portions. You may apply to the apparatus which manufactures a laminated iron core, and may apply to the apparatus which manufactures a non-dividing type (annular) laminated iron core. Moreover, although the iron core thin plate of the said embodiment shall have two crimping parts, a crimping part may be other than two places, and may take forms other than inserting a convex part in a recessed part. May be. In addition, the specific layout or the like of the progressive die is not limited to the example in the above embodiment, and can be changed as appropriate without departing from the gist of the present invention.

It is a longitudinal cross-sectional view which shows the outer diameter punching part of the progressive die apparatus which concerns on 1st Embodiment. It is a perspective view which shows the laminated iron core which concerns on 1st Embodiment. It is a top view of the outline punching die concerning a 1st embodiment. It is IV-IV sectional drawing in FIG. It is a perspective view which shows the inner surface of the external punching die which concerns on 1st Embodiment. It is a figure which shows the effect | action of 1st Embodiment. It is the VII part enlarged view in FIG. It is VIII-VIII sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the outer diameter punching part of the progressive die apparatus which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the external punching die concerning a partial modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Progressive die apparatus 3 Upper mold | type 4 Lower mold | type 11 Outline punching punch 13 Outline punching die 16 Laminated iron core 17 Iron core thin plate 17a Magnetic pole part 17b Relay part 17c Inner diameter part 18 Iron core thin plate 18a Magnetic pole part 18b Relay part 18c Inner diameter part 19a Measurement Hole (caulking part)
19b Measuring hole (caulking part)
20a Caulking convex portion (caulking portion)
20b Caulking convex portion (caulking portion)
21a Caulking concave portion (caulking portion)
21b Caulking recess (caulking part)
34-37 Straight part 38 Escape part 138 Escape part W Hoop material (band metal thin plate)

Claims (1)

  A progressive die that punches out the outer shape of the iron core thin plate and pulls it into the die, and applies a pressing force in the laminating direction by applying side pressure to the iron core thin plate drawn in the squeeze ring that is placed following the die. The outer shape punching die and the squeeze ring are integrally formed, and in the punching hole portion corresponding to the squeeze ring following the punching hole portion of a predetermined depth constituting the die for punching the outer shape, the inner peripheral shape is formed. A progressive mold apparatus for producing a laminated core, characterized in that a relief part is formed in a partly pulling direction, and a lateral pressure is applied to a core sheet that is pulled out by the remaining straight part.

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