JP2009006351A - Die device for laminated core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die device for a laminated core which enables the number of the parts thereof to be reduced, is easily manufactured and assembled and therefore enables the cost thereof to be reduced. <P>SOLUTION: A punching die 12 for supporting a metal plate 1 is provided in the upper part of a lower die 11, an upper die 14 having a punch 13 for forming iron-core pieces 2 by punching the metal plate 1 is provided above the die 12. A guide passage 17 communicated with the lower-end opening of a punching hole 12a of the die 12 is formed in the lower die 11, lateral pressure imparting blocks 18, 19 for imparting the lateral pressure to the iron-core pieces 2 are respectively housed in a plurality of opposing housing grooves and guiding grooves which are formed in the vertical direction on the inner circumferential surface of the guiding passage 17. The lateral pressure imparting block 19 of both lateral pressure imparting blocks 18, 19 is housed movably backward and a pressing mechanism 31 for always pressing the block 19 in the lateral pressure imparting direction is interposed between the back of the lateral pressure imparting block 19 and the lower die 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mold apparatus for a laminated core used for a stator or rotor for an electric motor, or a core of a transformer, and more particularly to an iron core piece when a metal plate material is pressed and laminated while caulking each other. It relates to the improvement of the support structure.

  As shown in FIGS. 5 and 6, for example, the mold apparatus for the laminated core has a shape shown in FIG. 5 so as to include the concave portion 1a and the convex portion 1b from the plate material 1 on which the concave portion 1a and the convex portion 1b are formed in advance. The core pieces 2 are stamped and formed by pressing, and a large number of the core pieces 2 are laminated as shown in FIG. 7, and are caulked together with the convex portions 1b fitted into the concave portions 1a of the core pieces 2 adjacent to each other in the vertical direction. The laminated core 3 is manufactured by being fixed.

  As shown in FIG. 8, a punching die 12 that supports the plate material 1 is fixed to the upper part of the lower mold 11 of the mold apparatus of the laminated core 3. Above the die 12, an upper mold 14 having a punch 13 for punching out a portion including the concave portion 1a is installed, and is moved up and down by a lifting mechanism (not shown). A guide passage 17 is formed in the central portion of the lower mold 11 to guide the punched iron core pieces 2 in a stacked state. The guide passage 17 applies a plurality of lateral pressures to the iron core pieces 2 from the left and right sides. The side pressure applying blocks 18 and 19 are accommodated and fixed. Tapered slopes 18a and 19a are formed at the upper end portions of the side pressure applying surfaces of the both-side pressure applying blocks 18 and 19 such that the intervals are narrower toward the lower end. Then, the plate material 1 supported on the upper surface of the die 12 is punched into a predetermined shape by the punch 13 of the upper die 14, and the punched iron core piece 2 is inserted into the side pressure applying blocks 18, 19 from the punching hole 12 a of the die 12. The iron core piece 2 is caulked and fixed between the inclined surfaces 18a and 19a.

  The conventional laminated core mold apparatus is constructed such that the both-side pressure application blocks 18 and 19 are fixed to the lower mold 11 and the core piece 2 is forcibly pushed between the tapered inclined surfaces 18a and 19a. If variations in the dimensions and assembly accuracy of the blocks 18 and 19 occur several microns, or the size of the individual iron core pieces 2 slightly changes, the following problems arise. That is, the side pressure acting on each core piece 2 of the laminated core 3 varies, and an excessive load is applied to the core piece 2 on which a large side pressure acts, causing the core piece 2 to be distorted and tilted. There was a problem that the laminated state of 2 became unstable. Further, if the mold is continuously used, the punching die 12 is gradually worn and the iron core piece 2 is gradually increased, the load on the iron core piece 2 is remarkably increased, and the shape of the laminated iron core 3 is adversely affected. There was a problem. Furthermore, when the load of the laminated iron core 3 is increased, the load on the mold is also increased, leading to the problem of accelerated wear and damage to the mold.

In order to eliminate the above-described conventional problems, Patent Document 1 discloses that the core piece is separated from the belt-shaped iron plate by the press being lowered by the pressing body reciprocated by the linear actuator on the outer peripheral surface of the laminated body of the core pieces. It has also been proposed that the pressing body protrudes only when it is punched out, thereby generating a frictional force necessary for the iron core piece to be caulked and fixed.
Japanese Patent Publication No. 3-11855

  However, the conventional mold apparatus requires a linear actuator for driving the pressing body and its drive circuit, which increases the number of parts, making the manufacturing and assembly work cumbersome and reducing costs. There was a problem that I could not.

  The present invention provides a mold apparatus for a laminated iron core that eliminates the above-mentioned conventional problems, reduces the number of components, can easily perform manufacturing and assembly operations, and can reduce costs. It is in.

  In order to solve the above problems, the invention described in claim 1 is characterized in that a punching die for supporting a plate material on which a caulking concave portion and a convex portion are formed is provided on an upper portion of a lower die, and the concave portion is provided above the die. And an upper die having a punch for punching the plate material to form an iron core piece so as to include a convex portion, and forming a guide passage communicating with a lower end opening of the die punching hole for the lower die, Side pressure applying blocks for applying a side pressure to the iron core pieces are accommodated in a plurality of opposing receiving grooves formed in the vertical direction with respect to the inner peripheral surface of the guide passage, and the side pressure applying blocks are applied by the pressing force of the punch. Each of the core pieces is caulked integrally by fitting a convex portion or a concave portion formed in the subsequent core piece to a concave portion or a convex portion formed in the core piece punched out in advance. Die of laminated core to laminate the core pieces In location, and summarized in that interposed a pressing mechanism for pressing at all times the block in the back pressure imparting direction between at least one of the back and the lower die of lateral pressure applying block among the plurality of the lateral pressure applying block.

  The invention according to claim 2 is characterized in that, in claim 1, a pair of guide surfaces narrower toward the lower side are formed on the upper side of the side pressure applying surfaces of the plurality of opposing side pressure applying blocks. And

  According to a third aspect of the present invention, in the first or second aspect, the lateral pressure applying block is formed in a vertically long shape so as to be oriented in the vertical direction, and the pressing mechanism is provided at a plurality of locations in the vertical direction along the lateral pressure applying block. The gist is that it is arranged.

  The gist of the invention according to claim 4 is that, in any one of claims 1 to 3, the opposing side pressure applying blocks are arranged at a plurality of locations at predetermined intervals in the horizontal direction. .

The gist of a fifth aspect of the present invention is that, in any one of the first to fourth aspects, the pressing mechanism is provided with a pressing force adjusting means.
A sixth aspect of the present invention is the method according to any one of the first to fifth aspects, wherein the housing groove is provided with a position restricting portion that restricts a forward position of the side pressure applying block, and a back surface of the side pressure applying block is The gist is that it is pressed by an elastic body.

(Function)
In this invention, when an iron core piece punched and formed by a punch is pressed between opposing side pressure applying blocks, the side pressure applying block pressed by the pressing mechanism is retracted against the pressing force. For this reason, even if the dimensions and assembly accuracy of the double-sided pressure application block vary or the size of each core piece changes slightly, the side pressure against the core piece is properly maintained, and the Scratches are prevented and the laminated state of the laminated core becomes appropriate.

  According to the present invention, since the side pressure applying block is constantly pressed in the side pressure applying direction by the pressing mechanism, the number of parts can be reduced, manufacturing and assembling operations can be easily performed, and the cost can be reduced. .

  Hereinafter, an embodiment of a mold apparatus for a laminated iron core embodying the present invention will be described with reference to FIGS. The mold apparatus of this embodiment is configured to manufacture a laminated core 3 by punching out the core piece 2 from the plate 1 described in FIGS. 5 to 7 in the background section.

  As shown in FIG. 1, a die 12 for punching that supports the plate 1 is fixed to the upper part of the lower mold 11 of the mold apparatus. An upper die 14 having a punch 13 for punching out a portion including the concave portion 1a (the convex portion 1b) is installed above the die 12 and is moved up and down by a lifting mechanism (not shown). The planar shape of the punching hole 12a and the punch 13 of the punching die 12 is the same as the outer shape of the iron core piece 2 shown in FIG.

  As shown in FIG. 2, a receiving hole 11a having a rectangular shape in plan view is formed at the center of the lower mold 11, and the first lower mold block 15 and the second lower mold block 16 are formed in the receiving hole 11a. The accommodation is fixed. A guide passage 17 for guiding and moving the laminated iron core 3 in which the iron core pieces 2 are laminated is formed on the die matching surfaces of the first lower die block 15 and the second lower die block 16 that are directed in the vertical direction. The planar shape of the guide passage 17 is also the same as the shape of the punching hole 12a of the punching die 12.

  As shown in FIG. 2, on the inner peripheral surface of the guide passage 17, the receiving groove 15a and the guide groove 16a (see FIG. 3) are directed to a plurality (six in this embodiment) in the horizontal direction and to the vertical direction. Are formed so as to face each other. Side pressure applying blocks 18 and 19 are accommodated in the accommodating grooves 15a and the guide grooves 16a so as to face each other so as to face each other. As shown in FIG. 1, slopes 18a and 19a are formed on the opposing surfaces of the both-side pressure applying blocks 18 and 19, that is, the upper portions of the side pressure applying surfaces, as guide surfaces that gradually decrease in distance from the upper end to the lower side. ing. The side pressure application block 18 in the housing groove 15 a is fixed to the first lower mold block 15 by a bolt 20. A spacer 21 is interposed between the bottom surface of the housing groove 15a and the back surface of the side pressure applying block 18, and the position of the side pressure applying surface of the side pressure applying block 18 in the guide passage 17 can be arbitrarily determined by replacing the spacer 21. It can be adjusted to.

  2 and 3, the guide groove 16a is formed in a dovetail shape, the side pressure applying block 19 is formed in a trapezoidal column shape (ant shape), and the side pressure applying block 19 is formed in the guide passage as shown in FIG. It is accommodated so as to be movable in a horizontal direction away from 17. In this embodiment, the taper surface facing the horizontal direction of the guide groove 16a serves as a position restricting portion that restricts the advance position of the side pressure applying block 19. The second lower mold block 16 is formed with a vertically long and flat guide passage 16b extending in the horizontal direction so as to open to the bottom surface of each guide groove 16a, and each guide passage 16b includes a spacer. 22 is accommodated so as to be linearly movable in the horizontal direction. The spacer 22 and the side pressure applying block 19 are connected by a bolt (not shown).

  The lower mold 11 is provided with a pressing mechanism 31 for pressing each side pressure applying block 19 and the spacer 22 toward the laminated core 3. A spring housing block 32 is housed and fixed in the housing hole 11 b formed in the lower mold 11. In the spring housing block 32, four spring housing holes 33 are formed in the horizontal direction so as to correspond to the spacers 22. An inner flange 33a is integrally formed on the inner periphery of each spring accommodating hole 33 on the spacer 22 side, and a screw hole 33b is formed on the opposite end. The spring accommodating hole 33 accommodates a pressing pin 34 having a flange 34 a that is engaged with the inner flange 33 a so as to be movable in the axial direction of the spring accommodating hole 33. A coiled spring 35 is accommodated in the spring accommodating hole 33. One end of the spring 35 is pressed toward the pressing pin 34 by a bolt 36 as a pressing force adjusting means screwed into the screw hole 33b. The bolt 36 is formed with an engagement hole (not shown) for engaging a hexagon wrench, and the bolt 36 can be rotated by inserting the hexagon wrench from the insertion hole 11 c formed in the lower mold 11. Each spring 35 always presses the proximal end surface of the pressing pin 34 so that the side pressure applying block 19 is pressed toward the guide passage 17 via the spacer 22. When the iron core piece 2 is not present in the guide passage 17, a predetermined gap is formed between the back surface of the side pressure applying block 19 and the bottom surface of the guide groove 16 a, and when the iron core piece 2 is pushed into the guide passage 17, the side pressure is increased. The application block 19 and the spacer 22 are configured to be movable rearward in the horizontal direction against the pressing force of the spring 35.

Next, the operation of the laminated iron mold apparatus configured as described above will be described.
As shown in FIG. 1, with the plate 1 placed on the top surface of the punching die 12, the upper mold 14 is lowered and the punch 13 forms the recess 1 a and the projection 1 b (see FIG. 6) from the plate 1. The iron core piece 2 is punched out so as to include it. The punched iron core piece 2 is accommodated in the punching hole 12a. When the punching operation of the iron core pieces 2 is repeated, each iron core piece 2 is moved downward in the punching hole 12a in a laminated state. Then, the iron core piece 2 is moved from the lower end of the punching hole 12a to the guide passage 17 formed in the first and second lower mold blocks 15,16. The iron core piece 2 moved to the guide passage 17 is sequentially pushed downward while being sandwiched between the two inclined surfaces 18a and 19a of the side pressure applying blocks 18 and 19. Each time the iron core piece 2 is pushed downward, the slopes 18a and 19a are pressed away from each other by the iron core piece 2, so that the side pressure applying block 19 is moved rearward in the horizontal direction against the pressing force of the spring 35. .

In the guide passage 17, the iron core piece 2 to which the side pressure is applied by the side pressure applying blocks 18 and 19 is formed into the iron core piece 2 punched out in advance between the side pressure applying blocks 18 and 19 by the pressure of the punch 13. The convex part 1b formed in the subsequent iron core piece 2 is fitted to the concave part 1a, and the iron core pieces 2 are caulked together to manufacture the laminated iron core 3. (See Figure 7)
The laminated core 3 in which a predetermined number of iron core pieces 2 are laminated is taken out from below the guide passage 17 by an unillustrated push-out mechanism.

According to the mold apparatus for the laminated core of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, of the side pressure applying blocks 18 and 19 provided in the first and second lower mold blocks 15 and 16, the side pressure applying block 19 is pressed by the pressing mechanism 31 having the spring 35, thereby guiding the guide passage. A side pressure was applied to the iron core piece 2 accommodated in 17. For this reason, a constant side pressure can be applied to the core piece 2 by the spring 35, the side pressure applying blocks 18, 19 have variations in size and assembly accuracy, and the size of the core piece 2 slightly changes. Even if it does, the bad influence with respect to the iron core piece 2 can be prevented. That is, the proper laminated iron core 3 can be manufactured without the distortion, inclination or scratches of the iron core piece 2.

  (2) In the above embodiment, since the force of the spring 35 is constant, the load applied to the lower mold 11 is also constant, the life of the lower mold 11 is extended, and the load on the iron core piece 2 does not need to be adjusted. Production capacity can be improved, maintenance time can be reduced, and costs can be significantly reduced.

(3) In the said embodiment, since electric parts, such as an actuator, are not used, cost can be reduced.
(4) In the above embodiment, since the spring 35 is used to displace the space between the side pressure applying blocks 18 and 19, the side pressure between the adjacent iron core pieces 2 becomes uniform, and the balance of the side pressure is improved. When this balance is bad, the falling amount of the adjacent iron core pieces 2 is different, and the laminated state of the iron core pieces 2 becomes defective.

  (5) In the above embodiment, the spacer 22 is supported so as to reciprocate on the same straight line in the horizontal direction in the guide passage 16b, so that the inclination of the spacer 22 is prevented and the side pressure applying block 19 connected to the spacer 22 is used. Can be prevented. For this reason, the lateral pressure can be stably applied to the laminated iron core 3 by the lateral pressure applying block 19.

  (6) In the above embodiment, as shown in FIG. 2, the side pressure applying blocks 19 are arranged in a plurality of locations in the horizontal direction, and each side pressure applying block 19 is pressed independently by the pressing mechanism 31, and the bolt 36 is screwed. By adjusting the total amount, the pressing force of the spring 35 of each pressing mechanism 31 can be adjusted. For this reason, the pressing force of the iron core piece 2 by the plurality of side pressure applying blocks 19 can be adjusted uniformly, and the amount of lowering of each part of the iron core piece 2 in the horizontal direction is made the same, so that the iron core piece 2 is in a horizontal state. It can hold | maintain and can make the lamination | stacking state of the laminated iron core 3 appropriate.

  (7) In the above-described embodiment, the pressing mechanisms 31 are provided at a plurality of locations in the vertical direction with respect to one spacer 22, and the one spacer 22 is pressed evenly at any location. The lateral pressure to 3 can be applied equally.

In addition, you may change the said embodiment as follows.
As shown in FIG. 4A, the guide groove 16a of the second lower mold block 16 and the lateral cross-sectional shape of the side pressure applying block 19 are respectively formed in a convex shape so that the advance position of the side pressure applying block 19 can be regulated. It may be configured.

  -As shown in FIG.4 (b), you may form the side pressure provision block 19, the spacer 22, and the press pin 34 integrally. In this case, the number of parts can be reduced, manufacturing and assembling work can be easily performed, and the cost can be reduced.

The side pressure applying block 18 may be pressed by the pressing mechanism 31 in the same manner as the side pressure applying block 19.
Of the slopes 18a and 19a of the side pressure applying blocks 18 and 19, for example, the slope 18a of the side pressure applying block 18 may be omitted. Further, both the slopes 18a and 19a may be arcuate.

A single pressing mechanism 31 may be provided for one spacer 22.
-You may embody in the die apparatus of the laminated iron core which provided the side pressure provision blocks 18 and 19 only with one pair.

The punching die 12 may be punched by supporting the plate 1 with the concave portion 1a facing upward.
Instead of the coiled spring 35, for example, a disc spring or an elastic body of rubber or resin may be used.

The longitudinal cross-sectional view which shows one Embodiment which actualized the metal mold | die apparatus of the laminated iron core of this invention. FIG. 1 is a sectional view taken along line 1-1 of FIG. The separation perspective view of a side pressure grant block, a spacer, a side pressure grant block, and a press mechanism. (A) And (b) is a partial plane sectional view which shows another embodiment of this invention. The top view of a board | plate material and an iron core piece. The expanded sectional view of the recessed part and convex part of a board | plate material. The fragmentary sectional view of a laminated iron core. The longitudinal cross-sectional view which shows the metal mold | die apparatus of the conventional laminated iron core.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Plate material, 1a ... Concave part, 1b ... Convex part, 2 ... Iron core piece, 3 ... Laminated core, 11 ... Lower die, 12 ... Die for punching, 12a ... Punching hole, 13 ... Punch, 14 ... Upper die, 15a ... receiving groove, 16b, 17 ... guide passage, 18, 19 ... side pressure applying block, 18a, 19a ... slope as guide surface, 22 ... spacer, 31 ... pressing mechanism, 35 ... spring.

Claims (6)

A punch for forming a core piece by punching a die for supporting a plate material in which a concave portion and a convex portion for caulking are formed on the upper portion of the lower die and punching the plate material so as to include the concave portion and the convex portion above the die. An upper die having a plurality of oppositely formed upper and lower guide passages that communicate with the lower die opening of the die punching hole. A recess or projection formed in the core piece that is punched in advance between the side pressure applying blocks by the pressurizing force of the punch. In a mold apparatus for a laminated core in which each core piece is laminated by fitting a convex part or a concave part formed in a subsequent iron core piece to the part and caulking each iron piece integrally.
A die for a laminated iron core, wherein a pressing mechanism for constantly pressing the block in the back pressure application direction is interposed between the back surface of at least one of the side pressure application blocks and the lower mold among the plurality of side pressure application blocks. apparatus. 2. The mold apparatus for a laminated core according to claim 1, wherein a pair of guide surfaces narrower toward the lower side are formed on the upper side of the side pressure applying surfaces of the plurality of opposing side pressure applying blocks. 3. The lateral pressure applying block according to claim 1 or 2, wherein the lateral pressure applying block is formed in a vertically long shape so as to be directed in the vertical direction, and the pressing mechanism is disposed at a plurality of locations in the vertical direction along the lateral pressure applying block. A laminated iron core mold device. 4. The mold apparatus for a laminated core according to claim 1, wherein the opposed side pressure applying blocks are arranged at a plurality of locations at predetermined intervals in the horizontal direction. 5. 5. The mold apparatus for a laminated iron core according to claim 1, wherein the pressing mechanism is provided with a pressing force adjusting means. In any one of Claims 1-5, the said groove | channel is provided with the position control part which controls the advance position of a side pressure provision block, and the back surface of this side pressure provision block is pressed by the elastic body. Die equipment for laminated iron core.

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