JP5508981B2 - Iron sheet manufacturing equipment - Google Patents

Description

  The present invention relates to a core sheet manufacturing apparatus that manufactures a core sheet for a laminated core, and more particularly to a technique for aligning core sheets in a state in which a rotational phase is changed while adopting a simple configuration.

  A laminated iron core for a rotating electrical machine is often manufactured by a progressive die apparatus using a hoop material (thin strip plate) of an electromagnetic steel sheet as a raw material. In the progressive die device, the core thin plate is continuously formed by sequentially punching the pilot holes, slots, and inner diameter teeth on the hoop material that is intermittently transferred, and the core thin plate after the outer shape punching is squeezed. A laminated iron core is obtained by adhering / integrating a predetermined number of core sheets by caulking or the like while closely contacting / stacking them inside.

  In general, a hoop material, which is a material of an iron core thin plate, is manufactured by rolling, and therefore, a direction perpendicular to the rolling feed direction (that is, the width direction) due to the parallelism of the rolling roll, non-uniformity of the outer diameter, and the like. Have a very small thickness deviation. For this reason, when the iron core thin plates after the outer shape punching are laminated as they are, both end faces of the completed laminated core are not parallel, and there is a concern that the performance of the rotating electrical machine in which the laminated iron core is incorporated may be deteriorated. Therefore, the die in the lamination process is made to be a rotatable structure, and when a predetermined number (one or a plurality) of core thin plates are punched, the die is rotated by a predetermined angle (for example, 45 °) to rotate the core thin plate. Techniques have been proposed in which the thickness deviation is canceled by laminating (so-called rotational lamination) while changing the phase by a predetermined amount (see Patent Documents 1 and 2).

JP 2007-268545 A JP-A-5-42332

  However, even if the rotating lamination method described in Patent Documents 1 and 2 is employed, the following problems may occur. That is, when the iron core sheet is small and the number of magnetic poles is large, it is not possible to provide caulking portions (caulking protrusions or caulking recesses) for the number of magnetic poles due to space problems, and the die rotation angle (that is, the overlapping iron core sheets) The rotational phase of the rotating electrical machine) becomes large, and the deterioration of the performance of the rotating electrical machine due to the thickness deviation cannot be effectively suppressed. For example, when a laminated iron core is manufactured by rotating and laminating small-diameter core thin plates having nine magnetic poles, if nine caulking portions cannot be provided at an angular interval of 40 °, 120 ° (360 ° is a prime number of 9). Rotating lamination is performed by providing three caulking portions at an angular interval of (an angle divided by a certain 3). However, 120 ° is too large as the rotational phase of the rotational lamination, and it is inevitable that the performance of the rotating electrical machine is deteriorated as compared with the case where the rotational lamination is performed at a rotational phase of 40 °.

  In order to solve such a problem, the present inventors sequentially punched the core thin plates from the hoop material while rotating the die at an angular interval of 40 °, and rotated the punched core thin plates by 40 ° outside the mold. It was also considered to align the phases with different phases. However, in this method, since fixing / integration is not performed in the squeeze ring, it is necessary to manually align the thin iron sheets that have fallen one by one from the die (die), which increases production efficiency. However, it could not be applied to progressive die equipment that was supposed to be low enough for mass production.

  The present invention has been made in view of such a background, and an object of the present invention is to provide an iron core thin plate manufacturing apparatus capable of aligning iron core thin plates in a state where the rotational phase is changed while adopting a simple configuration.

  In the first aspect of the present invention, there is provided an iron core thin plate manufacturing apparatus for continuously manufacturing a core thin plate constituting a laminated iron core, from a strip-shaped steel plate intermittently transferred by an outer shape punch and an outer shape punch die. Iron core thin plate punching means for sequentially punching the iron core thin plate, and an iron core punched while being intermittently rotated by a predetermined angle about the axis of the outer punching die as a rotation axis provided below the iron core thin plate punching means An iron core thin plate transfer cylinder that sequentially transfers the thin plate downward, and a guide rail that aligns the core thin plates sequentially discharged from the lower end of the iron core thin plate transfer cylinder, and the iron core thin plate has an opening at an outer periphery of the iron core thin plate A plurality of slots are formed, and the iron core thin plate transfer cylinder is formed with a core thin plate transfer hole for guiding the iron core thin plate, and the iron core thin plate transfer hole opens at the lower end center of the outer shape punching die. On the other hand, the lower end side opens to a part where one of the slots is positioned at the axis of the iron core thin plate transfer cylinder, and the alignment with the guide rail is centered on the guide rail in which the iron core thin plate is fitted in the slot. Made by rotating under its own weight.

  In the second aspect of the present invention, the core thin plate transfer cylinder is provided with positioning ribs that are fitted into the openings of the slots so as to restrict the rotation of the core thin plate within the core thin plate transfer hole.

  In the third aspect of the present invention, the iron core thin plate transfer cylinder is provided with a keeper ring for holding the iron core thin plate with a predetermined holding force below the iron core thin plate transfer hole.

  In the fourth aspect of the present invention, the guide rail extends in the vertical direction, and the upper end is located at the axis of the iron core thin plate transfer cylinder, and is continuous with the axis. And a horizontal shaft portion extending in the horizontal direction.

  According to the first aspect of the present invention, the iron core thin plates punched by the iron core thin plate punching means are aligned by turning around the guide rail with which the slots are engaged. Moreover, according to the 2nd side surface of this invention, careless rotation of the iron core thin plate in an iron core thin plate transfer hole is suppressed. Moreover, according to the 3rd side surface of this invention, the careless fall etc. of the iron core thin plate from an iron core thin plate transfer hole are prevented. Moreover, according to the 4th side surface of this invention, the iron core thin plate which fell from the iron core thin plate transfer hole side and engaged with the vertical axis | shaft part of the guide rail becomes easy to turn by being suspended in a horizontal axis part.

It is a side view showing the whole iron core sheet manufacturing device composition concerning an embodiment. It is a layout figure of the progressive die which concerns on embodiment. It is the III section enlarged view in FIG. It is a figure which shows rotation of the iron core thin plate transfer cylinder which concerns on embodiment. It is a figure which shows the action | operation of the iron core thin plate manufacturing apparatus which concerns on embodiment. It is a figure which shows the state of the iron core thin plate just under keeper ring which concerns on embodiment. It is a figure which shows the alignment effect | action of the iron core thin plate by the guide rail which concerns on embodiment.

Hereinafter, an embodiment of an iron core thin plate manufacturing apparatus to which the present invention is applied will be described in detail with reference to the drawings.
<< Configuration of Embodiment >>
<Overall configuration>
As shown in FIG. 1, an iron core sheet manufacturing apparatus 1 includes a progressive mold apparatus 3 that sequentially presses the hoop material 2 of an electromagnetic steel sheet, and an iron core sheet 4 punched by the progressive mold apparatus 3 (FIG. 2). And a guide rail 5 for transferring to a laminated core manufacturing apparatus (not shown). The progressive die device 3 includes an upper die 11 having a plurality of punches attached to the lower surface thereof, a lower die 12 holding dies corresponding to the punches of the upper die 11, and a hoop material 2 after punching from the punch. And a stripper plate 13 to be separated.

  As shown in FIG. 2, the progressive die apparatus 3 includes a pilot punching process (1), a slot punching process (2), an idle process (3), a shaft hole punching process (4), and an idle process (5). The punch hole 21 is punched in the pilot punching step (1) and the slot 22 is cut in the slot punching step (2). The shaft hole 23 is punched in the punching and shaft hole punching step (4), and the iron core thin plate 4 is punched in the outer shape punching step (6). The slots 22 are circular ones formed in the iron core thin plate 4 at an angular interval of 40 °, and each has an opening 25 on the outer periphery of the iron core thin plate 4.

  As shown in FIG. 1, in the outer shape punching step (6), in addition to the outer shape punch 31 and the outer shape punching die 32, an iron core thin plate transfer cylinder 34 that holds the outer shape punching die 32 at the upper end, a step motor 35. And a rotational drive device 37 composed of a power transmission mechanism 36 (for example, a worm reduction mechanism) is installed. In order to omit the step motor 35 and its control device, the operating force of the progressive die device 3 (upper die 11) is taken out as a rotational force, and the core thin plate transfer cylinder 34 is intermittently rotated via an index device, a timing belt or the like. You may take a method.

<Steel core transfer cylinder>
As shown in FIG. 3, the iron core thin plate transfer cylinder 34 is rotatably held by the lower mold 12 through upper and lower bearings 38 and 39, and is rotated intermittently at an angular interval of 40 ° by a rotary drive device 37. Driven. An iron core thin plate transfer hole 41 is formed in the iron core thin plate transfer cylinder 34, and a keeper 43 is fastened to the lower end of the iron core thin plate transfer hole 41 via a keeper presser plate 42.

  The core thin plate transfer hole 41 is inclined with respect to the axis L of the core thin plate transfer cylinder 34, and the upper end side opens at the center of the lower end of the external punching die 32, while the lower end side is one of the slots 22 of the core thin plate 4. (Hereinafter, referred to as a specific slot 22a) is opened at a position where the core thin plate transfer cylinder 34 is positioned at the axis L. The inner diameter of the iron core thin plate transfer hole 41 is set to be significantly larger than the outer diameter of the iron core thin plate 4 so that the iron core thin plate 4 slides down in the iron core thin plate transfer hole 41. The iron core thin plate transfer cylinder 34 is provided with positioning ribs 44 that protrude into the iron core thin plate transfer hole 41 and fit into the openings 25a of the specific slot 22a.

  The keeper ring 43 has a tapered portion 43a that is reduced in diameter downward, and a straight portion 43b that is continuous with the tapered portion 43a. The core thin plate 4 that is fitted from the upper end of the tapered portion 43a is predetermined by the straight portion 43b. Hold with tight binding power.

<Guide rail>
The guide rail 5 is made of a steel rod, and as shown in FIG. 1, as shown in FIG. And a horizontal shaft portion 53 that is continuous with the vertical shaft portion 51 and extends in the horizontal direction. As shown in FIG. 3, the vertical axis 51 protrudes a predetermined amount from the lower end of the keeper ring 43 into the iron core thin plate transfer hole 41 and has a tapered portion 51 a at the upper end. The outer diameter of the guide rail 5 is set smaller than the inner diameter of the slot 22 of the iron core thin plate 4 and larger than the opening 25 of the slot 22. As shown in FIG. 1, the horizontal shaft portion 53 is suspended from a die base 56 integrated with the lower die 12 via a plate-like bracket 55 whose thickness is smaller than the opening 25 of the slot 22. .

<< Operation of Embodiment >>
When the iron sheet manufacturing apparatus 1 is activated, the punching process described above is sequentially applied to the intermittently transferred hoop material 2 in the progressive die apparatus 3, and then the iron core is formed by the outer shape punch 31 and the outer shape punch die 32. The core thin plate 4 is punched into the thin plate transfer hole 41. And as shown in Drawing 4 (a)-Drawing 4 (i), iron core thin plate transfer cylinder 34 rotates clockwise every 40 degrees between one outside punching process and the next outside punching process. As a result, the rotational phase of the iron core thin plates 4 that overlap in the iron core thin plate transfer hole 41 changes by 40 °. Since the positioning ribs 44 are fitted into the openings 25a of the specific slots 22a, the iron core thin plate 4 does not shift in the rotation direction within the iron core thin plate transfer hole 41.

  As shown in FIG. 5, the iron core thin plate 4 lowered in the iron core thin plate transfer hole 41 is temporarily held horizontally by the keeper ring 43, and then pushed out and dropped by the iron core thin plate 4 in contact with the upper surface. The fallen core sheet 4 is engaged with the guide rail 5 in such a manner that the specific slot 22a is fitted on the longitudinal section 51 because the longitudinal section 51 of the guide rail 5 is positioned on the axis L of the core sheet transport cylinder 34. Will do. Since the iron core thin plate transfer cylinder 34 rotates by 40 ° as described above, as shown in FIG. 6, as shown in FIG. 6, each core thin plate 4 is centered on the specific slot 22 a (that is, the vertical axis portion 51) immediately below the keeper ring 43. The rotation phase of each is shifted by 40 °.

  The iron core thin plate 4 engaged with the guide rail 5 is pushed by the iron core thin plate 4 that sequentially falls from the keeper ring 43, thereby moving from the vertical axis portion 51 to the horizontal axis portion 53 via the arc portion 52. As shown in FIG. 7, the iron core thin plate 4 is swung by its own weight with the horizontal shaft portion 53 as the center of rotation in the arc portion 52 and the horizontal shaft portion 53, and the specific slots 22 a are aligned upward. Since the aligned iron core thin plates 4 are kept at a rotational phase difference of 40 °, they are transferred to a lamination process (not shown) while being suspended from the horizontal shaft portion 53. In the horizontal shaft portion 53, since the plate width of the bracket 55 is set smaller than the opening 25 of the slot 22, the transfer of the iron core thin plate 4 is not hindered by the bracket 55. In the present embodiment, the bracket 55 is a plate, but a rod having a diameter smaller than the opening 25 of the slot 22 may be used.

  In the present embodiment, by adopting the above-described configuration, the core thin plate 4 whose rotational phase has changed at a relatively small angle can be continuously punched and transferred to the next process in an aligned state. Significant improvement in iron core production efficiency.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the iron sheet manufacturing apparatus of the above embodiment manufactures an iron sheet having nine slots at an angular interval of 40 °, but the angular interval and the number of slots are not limited thereto. In the above embodiment, the angular interval between the slots and the rotation angle of the iron core thin plate transfer cylinder are matched, but the rotation angle of the iron core thin plate transfer cylinder may be a multiple of the angular interval of the slots. In the above embodiment, one guide rib is provided in the iron core thin plate transfer hole. However, a plurality of guide ribs may be provided, or the iron core thin plate is difficult to rotate in the iron core thin plate transfer hole. The guide rib may be omitted. Further, in the above embodiment, the keeper ring that holds the core thin plate is installed at the lower end of the core thin plate transfer hole, but by forming a locking projection for temporarily locking the core thin plate at the lower end of the plurality of guide ribs, etc. Keepering may be omitted. In the above embodiment, the guide rail has a vertical axis portion and a horizontal axis portion. However, the vertical axis portion and the horizontal axis portion are not essential. For example, as shown by a virtual line in FIG. The rail 5A may be provided with the inclined shaft portion 53A, or the entire guide rail may have a semicircular arc shape or the like. In addition, the specific structure of the progressive die apparatus, the specific shape of the guide rail, and the like can be changed as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Iron core sheet manufacturing apparatus 2 Hoop material 3 Progressive die apparatus 4 Iron core sheet 5 Guide rail 11 Upper mold | type 12 Lower mold | type 22a Specific slot 25a Opening 31 External punching punch 32 External punching die 34 Iron core thin plate transfer cylinder 37 Rotation drive apparatus 41 Iron core thin plate transfer hole 43 Keeper ring 44 Positioning rib 51 Vertical axis 53 Horizontal axis L L

Claims (4)

An iron core thin plate manufacturing apparatus for continuously manufacturing a core thin plate constituting a laminated iron core,
Iron core thin plate punching means for sequentially punching the iron core thin plate downward from the strip-shaped thin steel plate transferred intermittently by the outer shape punch and the outer shape punch die,
An iron core thin plate transfer cylinder which is provided below the iron core thin plate punching means, and which sequentially rotates the punched iron thin plate downward while intermittently rotating by a predetermined angle about the axis of the outer punching die as a rotation axis;
A guide rail for aligning the core thin plates sequentially discharged from the lower end of the core thin plate transfer cylinder,
In the iron core thin plate, a plurality of slots having openings on the outer periphery of the iron core thin plate are formed,
The core thin plate transfer cylinder is formed with a core thin plate transfer hole for guiding the core thin plate,
The iron core thin plate transfer hole has an upper end opened at the center of the lower end of the outer punching die, while the lower end opens at a position where one of the slots is positioned at the axis of the iron core thin plate transfer cylinder,
Alignment with the guide rail is performed by rotating the iron core thin plate with its own weight around the guide rail fitted in the slot.   2. The iron core thin plate transfer cylinder is provided with a positioning rib that fits into the opening of the slot so as to restrict the rotation of the iron core thin plate in the iron core thin plate transfer hole. A laminated iron core manufacturing apparatus.   3. The iron core thin plate transfer cylinder is provided with a keeper ring that holds the core thin plate with a predetermined holding force below the iron core thin plate transfer hole. Laminated iron core manufacturing equipment.   The guide rail extends in the vertical direction and has an upper end positioned at the axial center of the iron core thin plate transfer cylinder, a horizontal axis extending continuously in the vertical direction and extending in the horizontal direction. The apparatus for producing a laminated iron core according to any one of claims 1 to 3, characterized by comprising:

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