JP5924200B2 - Laminated structure and laminated structure manufacturing method - Google Patents

Description

The present invention relates to a laminated structure that is fastened to a steel sheet using a concavo-convex shape and a manufacturing method for manufacturing them.

Conventionally, a laminated structure formed by laminating thin plates which are a kind of steel plate is used, for example, in a laminated core of a rotor in an electric motor. As shown in the thin plate 7b of FIG. 24 (A), the laminated structure has convex and concave portions formed on the surface of the thin plate, and the laminated thin plates are fitted with the convex and concave portions formed on the opposing thin plates. Is fixed.

FIG. 24A shows a part of the manufacturing apparatus of the laminated structure and shows a partial process of forming the convex and concave portions on the thin plate 7b. As shown in FIG. 24A, the convex and concave portions of the thin plate 7b are formed by pressing the cylindrical punch 7a onto the thin plate 7b and receiving the thin plate 7b pushed out by the pressing with a cylindrical die 7c. Yes. The method of manufacturing the laminated structure by forming the convex and concave portions on the surface of the thin plate can form the convex and concave portions only by applying pressure from one direction to the thin plate, so that the working efficiency is good and the manufacturing method is suitable for mass production. is there.

JP 2001-11870 (Claim 1 etc.)

In order to laminate the thin plate 7b, the manufacturing apparatus is used to form the concavo-convex portion. However, as shown in FIG. 24 (A), during the formation of the convex and concave portions and after maintenance of the punch 7a and the die 7c, the punch The central axis of 7a and the central axis of the die 7c may be shifted by the dimension a. Since the deviation of the a dimension is caused by the structural deviation with respect to the punch 7a and the die 7c, the thin plates 7b each have a deviation of the a dimension, and when the thin plates 7b are laminated, As shown in FIG. 24 (B), the deviation of the dimension a is superimposed, and the steel sheet is fastened in such a manner that the laminated structure is inclined by the dimension b, thereby deteriorating the lamination aspect.

Although the example in which the laminated structure of the thin plate 7b is tilted is given, other aspects of lamination such as twisting, warping, and a decrease in fastening force are also deteriorated. These cause deterioration of product characteristics. For example, in the case of a laminated core of an electric motor, motor characteristics such as vibration, noise, induced voltage, and cogging torque are deteriorated. In order to solve these problems, there is an adjustment method in which the position of the punch or die is adjusted to bring the center of the punch closer to the center of the die. However, it is necessary to detach the die from the press for adjustment, and adjustment of the positions of the center of the punch and the center of the die requires high accuracy, and therefore requires a considerable time for adjustment.

Although there are prior art documents, when the center of the punch and the center of the die are greatly deviated (for example, about 0.01 mm), the aspect of the laminated structure is laminated in a direction deviating from the center. It is necessary to adjust the center of the die closer. According to Prior Art Document 1, a plurality of projections such as gears are provided on the convex side surface portion, and when fastening is performed even when there is a misalignment, the projections such as gears are scraped or crushed so as to be laminated. It is devised to suppress the tilted appearance due to the number of sheets. However, even in this method, there is a limit to the correction of the center deviation, and a method capable of further correction is demanded.

This is a technique for manufacturing a steel sheet laminated structure by forming a concavo-convex shape on a steel sheet, and is very effective in manufacturing a rotor and the like with a mold for mass production. This uneven shape forms unevenness like a steel plate 7b by the punch 7a and die 7c of FIG. However, during mass production or during mold maintenance, the center of the punch and die are shifted by a dimension, and when steel plates are stacked in this state, they are proportional to the number of stacked sheets and tilted by b dimension as shown in FIG. It is laminated in a state, and the lamination aspect is deteriorated. In order to solve these problems, the position of the punch or die is adjusted, and the stacking aspect is improved by bringing the center of the punch closer to the center of the die. Moreover, although the shape of a punch can be enlarged (the concave shape is enlarged) and the die shape can be reduced (the convex shape is reduced), there is a problem that the fastening force between the steel plates is weakened.

Further, in recent years, in order to reinforce the magnetic force of the core, the thin plate has become thinner, and the problem of the displacement of the thin plate has increased.

A plurality of plate-shaped steel plates each having a circular convex portion on the outer periphery formed in the plate thickness direction and a circular concave portion formed on the opposite surface of the convex portion in the plate thickness direction are laminated, and the concave portion of the plate steel plate In the laminated structure in which the plate steel plates are fixed by fitting the convex portions of the other plate steel plates facing each other, the central axis of the convex portion and the central axis of the concave portion in one plate steel plate By producing a plurality of plate-like steel plates that are spaced apart from each other and having different separation directions of the central axis of the concave portion with respect to the central axis of the convex portion, and stacking in the thickness direction, the central axis of the convex portion and the center of the concave portion in the laminated structure The direction away from the axis should not be superimposed in a certain direction.

According to the laminating method of the present invention, the accumulated misalignment due to laminating in a certain direction can be suppressed by the blade whose center of the unevenness is intentionally shifted in the mold, so that the laminating aspect (taole / twisting / decreasing fastening force) / product aspect Deterioration can be reduced.

Since a plurality of sets of blades with the centers of the irregularities intentionally shifted in the mold are arranged in the mold, it is possible to stack them by periodically combining them according to the number of stacked layers. Therefore, since control can be performed without detaching the mold from the press machine, the time required for mold adjustment can be shortened.

By installing a sensor in the mold so that the aspect of the laminated structure can be monitored, control is performed by a control device according to the current aspect, and adjustment is performed outside the mold so that the aspect of the laminated structure does not deteriorate. During mass production, since the control is performed while monitoring the laminated structure, the labor of manual adjustment can be saved.

3 is a side view of a progressive die assembly that molds the laminated structure in Embodiment 1. FIG. It is a side view which shows the progressive die upper part which is the upper part of a progressive die assembly part. It is the enlarged view which expanded a part of progressive die upper part. It is a side view which shows the progressive die lower part which is the lower part of a progressive die assembly part. It is a perspective view which shows a progressive die lower part. It is the schematic which shows the various shapes of die | dye. It is a flowchart explaining the manufacturing procedure of a laminated structure. It is the schematic which shows the layout of the progressive metal mold | die which has arranged several die | dyes. It is the schematic which shows the laminated structure manufactured with the laminated structure manufacturing apparatus. It is the schematic which shows the part of a progressive die bottom part in the progressive die assembly part of the laminated structure manufacturing apparatus in Embodiment 2. FIG. It is the schematic which shows the die | dye part of the progressive die bottom in Embodiment 2. FIG. It is the schematic which shows the die | dye of the progressive die bottom in Embodiment 2. FIG. 10 is a flowchart for explaining a procedure for manufacturing a laminated structure in a second embodiment. It is the schematic which shows the layout of the progressive metal mold | die which has arranged several die | dye in Embodiment 2. FIG. FIG. 11 is a schematic diagram for explaining another embodiment in the second embodiment. FIG. 10 is a perspective view showing a bottom part of a progressive die of a laminated structure manufacturing apparatus in a third embodiment. FIG. 10 is an enlarged view of a part of a bottom part of a progressive die of a laminated structure manufacturing apparatus in a third embodiment. It is a side view which shows the progressive die upper part of the progressive die assembly part in Embodiment 3. FIG. FIG. 10 is a schematic diagram showing a punching layout in a progressive die assembly according to a third embodiment. It is the schematic of the laminated structure formed by laminating | stacking the thin plate in Embodiment 3. FIG. It is a perspective view which shows the progressive die bottom part of the laminated structure manufacturing apparatus in Embodiment 4. FIG. It is the schematic which shows the inside of the location which metal mold | stacking of the progressive die bottom part in Embodiment 4 is carried out. It is the schematic explaining other embodiment. It is the schematic explaining the manufacturing method of the conventional laminated structure.

Embodiment 1
FIG. 1 shows a progressive die assembly 2 having a role of forming a laminated structure in a laminated structure manufacturing apparatus 1. The progressive die assembly 2 includes a progressive die upper portion 2A for pressing a thin plate to form a convex portion on the thin plate, a guide post 2b for raising and lowering the progressive die upper portion 2A, and a pressed thin plate. It is comprised from the progressive die bottom 2B which forms a recessed part by receiving.

As shown in FIG. 2, the progressive die upper part 2A is provided on a punch holder 2a having a rectangular parallelepiped planar shape, a mortar-shaped punch plate 2d having a substantially U-shaped cross section, and a bottom surface of the punch plate 2d. The guide stripper plate 2e having a flat plate shape and the flat backing plate 2c included in the punch plate 2d and partially protruding from the punch plate 2d. The punch plate 2d is attached to and held on the punch holder 2a by springs with support posts attached to both ends of the short part of the upper surface of the opening. In addition, a cylindrical guide post 2b for raising and lowering the punch holder 2a is provided at the end of the punch holder 2a.

In the upper part 2A of the progressive die, as shown in FIG. 3, the backing plate 2c, the punch plate 2d, and the guide stripper plate 2e are provided with a plurality of punch portions 20A. The punch portion 20A is a portion that presses the thin plate. The punch portion 20A is provided with a cylindrical punch 2f, and the punch guide bush 2g has a function of preventing buckling of the punch 2f and adjusting its position. The punch guide bush 2g has a flanged cylindrical shape, and the center of the inner diameter for guiding the punch 2f is eccentric with respect to the outer diameter of the guide of the punch 2f.

On the other hand, as shown in FIG. 4, the progressive die bottom 2B is a flat plate-shaped die holder 2i and a die plate 2p, which are formed in two steps in a stepped manner, and are provided on both sides of the upper surface of the die holder 2i. Material guide 2k and guide post bush 2h for supporting guide post 2b. Further, the die plate 2p is provided with dies 2j opened in the same number of cylinders as the punches 2f.

FIG. 5 is a perspective view of the upper part of the progressive die bottom 2B. In the progressive die bottom 2B, as shown in FIG. 5, the die holder 2i has a die plate 2p provided with a die 2j on the upper stage. The die 2j is provided on the side surface of the material guide 2k, and when the progressive die upper part 2A and the progressive die bottom 2B are supported via the guide post 2b, the punch 2f and the die 2j are opposed to each other. It is provided in the position to do. The die plate 2p is provided with a cutting hole 3k that presses and cuts the thin plate into an H shape.

In the die holder 2i, the die 2j is provided with two dies in the Y direction and four dies in the X direction. The two dies 2j are provided in the Y direction, so that when the thin plate is pressed by the punch 2f and the die 2j to form the convex concave portion, the thin plate in which the convex concave portion is cut into the H shape is positioned, Can be fixed. In the embodiment of the present embodiment, there are two places, but any number of places may be used as long as positioning is possible. On the other hand, four dies 3a to 3d are provided in the X direction.

Here, the dies 3a to 3d are drawings in which the central axes of the punch 2f and the die 2j are eccentric as shown in FIG. 6A is an eccentric drawing of the dies 3a to 3d, FIG. 6B is a drawing showing the eccentricity of the concave portions of the dies 3a to 3d on the thin plate, and FIG. 6C is a thin plate. It is the figure which showed the shift | offset | difference of the central axis of the convex-concave provided in FIG.

That is, as shown in FIG. 6, in the 3a die, the inner diameter center (projection forming portion) is eccentric to the left side with respect to the cylindrical outer diameter center. In the 3b die, the inner diameter center is eccentric to the right side with respect to the cylindrical outer diameter center, in the 3c die, the inner diameter center is eccentric to the upper side, and in the 3d die, the inner diameter center is eccentric to the lower side. Yes. For example, when the steel plates to be laminated are convexly formed at 3a, they are not formed at 3b to 3d. Further, when the convex shape is formed by 3d, the convex shape is not formed by 3a to 3c. That is, the concavo-convex shape is formed as a laminated structure formed by molding any one of 3a to 3d. The laminated structure is laminated as shown in the schematic diagram 1f of FIG. Therefore, the aspect of the laminated structure is improved by the eccentric structures formed in 3a to 3d canceling each other without tilting in one direction.

Next, the procedure for manufacturing the laminated structure will be described with reference to FIG.
When the laminated structure manufacturing apparatus is turned on and receives an instruction to start work (step 0), and the thin plate is inserted into the progressive die assembly 2, the thin plate is placed on the die plate 2p and placed on the material guide 2k. Then, the thin plate is conveyed in the X direction and conveyed to a predetermined position before the cutting hole 3k (step 1).

Subsequently, the laminated structure manufacturing apparatus lowers the progressive die 2A in the Z direction (step 2). When the progressive die upper portion 2A and the progressive die bottom portion 2B come into contact, the punch plate 2d of the progressive die upper portion 2A slides in the direction opposite to the Z direction. When the punch plate 2d slides in this direction, the backing plate 2c included in the punch plate 2d comes into contact with the bottom surface of the punch holder 2a. If the backing plate 2c continues to slide in the direction opposite to the Z direction while being in contact with the bottom surface of the punch holder 2a, the punch 2f provided on the bottom surface of the backing plate 2c penetrates the punch guide bush 2g and presses the thin plate. Then, the concave portion which is the first step is formed in a thin plate (step 3).

Subsequently, the die 3 of the laminated structure apparatus receives the thin plate pressed by the punch 2f, and forms the convex portion, which is the second process , on the thin plate (step 4).

At this time, as shown in FIG. 6A, the punch portion 20A takes into account the occurrence of structural displacement of the punch 2f, and the displacement between the punch 2f and the central axis of the punch guide bush 2g To the plane of the upper portion 2A, for example, a left eccentricity (3a), a right eccentricity (3b), an upper eccentricity (3c), and a lower eccentricity (3d) are provided. Therefore, the central axis perpendicular to the bottom surface of the concave portion formed in the first step and the central axis of the convex portion formed in the second step each have a deviation shown in FIG. Formed.

The stacked structure manufacturing apparatus, as shown in FIG. 8, are formed alternately concave and convex portions obtained by each eccentric with respect to the thin plate, by providing the uneven portion is eccentric different respective sheet, Further misalignment can be suppressed by sequentially laminating these.

Subsequently, the laminated structure manufacturing apparatus moves the thin plate in the X direction by a predetermined amount, and installs the convex and concave portions provided in the thin plate on the cutting hole 3k. The laminated structure manufacturing apparatus punches out the H-shaped thin plate, which is the third step, by pressing the H-shaped member against the thin plate installed on the cutting hole 3k. Continuously, the laminated structure manufacturing apparatus raises the H-shaped member, moves the thin plate in the X direction by a predetermined amount, installs the thin plate on the cutting hole 3k, and then attaches the H-shaped member to the thin plate. By pressing, an H-shaped thin plate is punched out. Then, the laminated structure manufacturing apparatus similarly performs the processing for the number of punch portions. (Step 5)

Subsequently, the stacked structure manufacturing apparatus stacks the thin plates punched into the H shape, which is the fourth step, to manufacture a stacked structure as shown in FIG. 9 (step 6). The laminated structure manufacturing apparatus ends this process when the power is turned off (step 7).

FIG. 9 shows a laminated structure manufactured by the laminated structure manufacturing apparatus. FIG. 9A is a view in which H-shaped thin plates are stacked. FIG. 9B is an image diagram of the convex and concave portions formed on the thin plate in the above steps 3 and 4 . As shown in FIG. 9B, the center axis is shifted due to the relationship between the punch 2f and the die 2j. In FIG. 9B, a thin plate having a convex / concave portion in which two types of misalignment of the central axis are formed is formed. However, the present invention is not limited to this type. Further, FIG. 9C is a diagram in which thin plates whose center axes are shifted are stacked, and by laminating thin plates having opposite center misalignment directions, the laminated structure is prevented from being bent and laminated. ing.

That is, the factor causing the deterioration of the stacking aspect is generated as the center shift in only one direction is accumulated by the number of stacked layers as described in the background art. Therefore, in order to solve these problems, as shown in FIG. 9, by laminating and fastening thin plates whose centers are shifted in directions opposite to the direction of the center shift, the respective center shift directions are offset. Therefore, it is possible to reduce the deterioration of the lamination appearance during the lamination.

Specifically, the eccentric direction is incorporated in a state as shown in 3a to 3d of FIG. When the steel plates to be laminated are concavely formed, for example, at 3a (left eccentricity), unevenness is not formed at 3b to 3d. Further, when the concave molding is performed at 3d (lower eccentricity), the concave-convex molding is not performed at 3a to 3c. That is, the concavo-convex shape is formed as a laminated structure formed by molding any one of 3a to 3d. The laminated structure is laminated as shown in the schematic diagram 1f of FIG. Therefore, the aspect of the laminated structure is improved by the eccentric structures formed in 3a to 3d canceling each other without tilting in one direction.

According to this invention, in the punch or die for forming irregularities in the mold, as shown in FIG. 5, a plurality of blades whose centers are shifted in opposite directions in advance are arranged for a plurality of steps. The steel plate is formed at any one of the steps 3a to 3d (3a to 3d are not processed at the same time). When the steel plates formed by 3a to 3d are stacked, the mutual misalignment directions cancel each other and the layers are stacked without tilting in one direction, and are stacked in a schematic diagram like the stacked structure 1f in FIG. Deterioration of the appearance of the multilayer structure is reduced. Secondary, for example, in the case of a laminated core of an electric motor, vibration and noise are reduced, and motor characteristics such as induced voltage and cogging torque are improved.

Embodiment 2
FIG. 10 shows a portion of the progressive die bottom 2B in the progressive die assembly 4 of the laminated structure manufacturing apparatus according to Embodiment 2 of the present invention. FIG. 11 shows the configuration of the die portion 4B of the progressive die bottom 2B. FIG. 12 shows the configuration of the die 4a. As shown in FIG. 10, the progressive die bottom 4B is different in the structure of the die 3 of the progressive die bottom 2B of the first embodiment, and the cylindrical die 4a having an eccentricity rotates as shown in FIG. Thus, the structure can freely change the eccentric direction.

As shown in FIG. 10, a cylindrical die bush 4b is incorporated in the die plate 4g. Further, as shown in FIG. 11, a cylindrical die 4a is incorporated in the die bush 4b. Further, as shown in FIG. 12, the die 4a is eccentric by a dimension a with respect to the center of the outer diameter. . The die bush 4b is a mechanism that can freely rotate in the direction of the arrow. The die bush 4b is made of a material having a high coefficient of friction such as rubber on the outer periphery, or has a groove formed on the outer periphery so that it can engage with the gear 4c . The gear 4c is configured to be extendable / contractible by a servo motor or a stepping motor 4d, and is configured such that the die 4a can rotate by expanding / contracting itself. Note that the die 4a and the gear 4c can be moved at high speed and with high precision by using the servo motor or the stepping motor 4d. Two dies 4a are provided in parallel along the Y direction.

Next, the procedure for manufacturing the laminated structure according to Embodiment 2 will be described with reference to FIG. The laminated structure manufacturing apparatus is turned on and receives an instruction to start the operation (step 10). When the thin plate is inserted into the progressive die assembly 4, the thin plate is placed on the die plate 2p and placed on the material guide 2k. Then, the thin plate is conveyed in the X direction and conveyed to a predetermined position before the cutting hole 3k (step 11).

Subsequently, the stacked structure manufacturing apparatus lowers the progressive die 2A in the Z direction (step 12). When the progressive die upper portion 2A and the progressive die bottom portion 2B come into contact, the punch plate 2d of the progressive die upper portion 2A slides in the direction opposite to the Z direction. When the punch plate 2d slides in this direction, the backing plate 2c included in the punch plate 2d comes into contact with the bottom surface of the punch holder 2a. If the backing plate 2c continues to slide in the direction opposite to the Z direction while being in contact with the bottom surface of the punch holder 2a, the punch 2f provided on the bottom surface of the backing plate 2c penetrates the punch guide bush 2g and presses the thin plate. Then, the recess which is the first step is formed in a thin plate (step 13).

Subsequently, the die 3 of the laminated structure apparatus receives the thin plate pressed by the punch 2f, and forms a convex portion, which is the second process , on the thin plate (step 14). At this time, as shown in FIG. 14 (A), the punch portion 20A has a convex concave portion as shown in FIG. 14A for the H shape punched in the third step because the die 4a is provided in parallel as described above. Are formed in one place.

Subsequently, the laminated structure manufacturing apparatus determines whether or not the projections and recesses necessary for punching the thin plate have been formed (step 15). If insufficient, one of the H-shaped thin plates to be punched is obtained. The thin plate is moved in the X direction by that amount (step 16). For example, the die 4a is rotated by 45 ° (step 17), and the process returns to step 12 to form a concave and convex portion. Thereby, the laminated structure manufacturing apparatus can form two convex recesses in the H-shaped thin plate to be punched as shown in FIG. 14 (B). Moreover, the laminated structure manufacturing apparatus forms convex and concave portions having a plurality of types of eccentricity by rotating the die 4a.

On the other hand, the laminated structure manufacturing apparatus installs the convex and concave portions provided on the thin plate on the cutting hole 3k when the formation of the convex and concave portions necessary for punching the thin plate is sufficient. The laminated structure manufacturing apparatus punches an H-shaped thin plate by pressing an H-shaped member against the thin plate placed on the cutting hole 3k. Continuously, the laminated structure manufacturing apparatus raises the H-shaped member, moves the thin plate in the X direction by a predetermined amount, installs the thin plate on the cutting hole 3k, and then attaches the H-shaped member to the thin plate. By pressing, an H-shaped thin plate is punched out. Then, the laminated structure manufacturing apparatus similarly performs the processing for the number of punch portions. (Step 18). The number of times of forming the concave and convex portions necessary for punching the thin plate is, for example, four times in the present embodiment because four eccentric patterns are formed in the first embodiment.

Subsequently, the stacked structure manufacturing apparatus stacks the thin plates punched into the H-shape which is the fourth process, and manufactures a stacked structure as shown in FIG. 9 (step 19). The laminated structure manufacturing apparatus ends this process when the power is turned off (step 20).

As described above, according to the present embodiment, since a plurality of eccentric convex and concave portions can be formed with one die 4a, the position of the eccentricity can be performed with fewer steps than the progressive money assembly portion 2 of the first embodiment. The relationship can be adjusted freely, and the size of the mold itself can be reduced. By rotating the die bush 4b in accordance with the number of laminated layers, the aspect of the laminated structure is improved by adjusting the eccentric directions to cancel each other. Further, the control panel for controlling the drive source is outside the mold and can be easily adjusted even during the press operation without detaching the mold.

Further, as compared with the first embodiment, when a plurality of steps for forming the concave / convex shape for fastening the thin plate at the bottom portion 2B of the progressive die is arranged as shown in FIG. However, according to this embodiment, when the eccentric die 4a rotates, for example, the eccentric direction of the convex and concave portions of the thin plate is freely adjusted based on the X direction. I can do it.

Moreover, in this Embodiment, compared with Embodiment 1, 2a-2g of FIG. 2 is components of a progressive die upper part. The punch guide bush 2g has functions of preventing buckling of the punch 2f and adjusting the position. This punch guide bush 2g has a cylindrical shape with a flange, and the center of the inner diameter for guiding the punch 2f is eccentric to the outer diameter. The punch guide bushes 2g is free to rotate, it is possible to change the direction of the free eccentric by the die bushing 4b and the gear 4c and the servo motor or the like 4d equivalent of the structure of FIG. As a result, the positional relationship of eccentricity can be freely adjusted with a smaller number of steps than in FIG. 3, so that the size of the mold itself can be reduced. By rotating the punch guide bush 2g according to the number of stacked layers, the aspect of the stacked structure is improved by adjusting the eccentric directions to cancel each other. Further, the control panel for controlling the drive source is outside the mold and can be easily adjusted even during the press operation without detaching the mold.

In this embodiment, the die 4a is rotated by the gear 4c. However, as shown in FIG. 15, two dies 4a may be rotated by one gear 4c. In this case, the plurality of dies 4a are arranged to face different eccentric directions.

Embodiment 3
FIG. 16 shows the progressive die bottom 5B of the laminated structure manufacturing apparatus in the third embodiment. As shown in FIG. 16, the progressive die bottom 5B in the present embodiment is configured such that a disk-shaped die bush 5b is provided on a die plate 5p, and a plurality of dies 5a are incorporated in the die bush 5b. Compared to the second embodiment, the progressive die bottom 5B is different in that a plurality of die sets having different eccentricities are prepared in advance.

As shown in FIG. 17, the die bush 5b includes a plurality of sets of dies 5a, and the die 5a is decentered from the central axis of the outer diameter of the die. The drive source 5c that rotates the die bush 5b uses a servo motor or a stepping motor. For example, the die bush 5b is arranged so that the eccentric direction of the die 5a is different when rotated by 90 degrees. Then, by rotating the die bush 5b by an angle of 90 degrees, the center shift amount is dispersed in different directions rather than in the same direction with respect to the number of stacked layers, so that the stacking aspect becomes good.

In addition, when the eccentric die is incorporated in the die for the eccentric adjustment method, the progressive die bottom is moved in the direction of eccentricity in the taole direction. Further, when an eccentric punch is incorporated in the punch, the direction of eccentricity is moved in the direction opposite to the taole direction.

FIG. 18A shows the upper part of the progressive die according to the present embodiment. FIG. 18B is an enlarged view of a part 50A of the upper part of the progressive die. The punch guide bush 5h has a function of preventing buckling of the punch 5i and adjusting the position. The punch guide bush 5h is incorporated in the punch guide plate 5g. The punch plate 5f has the same round shape as that of the punch plate 5g, and is a mechanism that can rotate synchronously together. As the rotation method, a servo motor or a stepping motor is used in the same manner as the die bush 5b. The punch guide bush 5h is decentered with respect to the central axis of the outer diameter of the die as in the die 5a. If the punch guide plate 5g and the punch plate 5f are, for example, a laminated structure as shown in FIG. 5, the punch guide plates 5g and the punch plates 5f are arranged so that the eccentric directions are different when rotated by 90 degrees. By rotating 90 degrees at a time, the amount of misalignment is not in the same direction with respect to the number of stacked layers but in different directions, so that the stacking aspect is improved.

FIG. 19 shows a blank layout 5d in the progressive die assembly, in which a plurality of convex and concave portions are formed at a time. FIG. 20 shows a laminated structure 5e in which convex and concave portions are formed on a thin plate and the thin plates punched by the progressive die assembly are stacked as shown in the above-described embodiment.

Embodiment 4
FIG. 21 shows the bottom of the progressive die of the laminated structure manufacturing apparatus in the fourth embodiment. In the above-described embodiment, the convex and concave portions having eccentricity are formed in advance so as to cancel the deviation of the laminated structure, but in this embodiment, the intermediate stage in which the laminated structure is configured by laminating thin plates. In the case where a deviation occurs, a convex recess having an eccentricity that cancels the deviation is formed.

FIG. 22 is a view showing the inside of the die stacking portion at the bottom of the progressive die, and sensors 6a to 6d for detecting the inclination of the laminated structure are installed in the die stacking portion to monitor the core state. It can be so. As the sensors 6a to 6d, sensors that can detect the appearance of the core, such as proximity sensors and piezoelectric sensors, can be used to check the state of the cores and the fins. FIG. 23 is an exemplary diagram in which the sensor 6 monitors the state of the layered structure such as the thickness of the laminated structure or the shininess.

In addition, the laminated structure manufacturing apparatus of the present embodiment can also apply the monitored result to the laminated structure manufacturing apparatus of the above-described embodiment. In the case of the first embodiment, the dies 3a to 3d are used. In the second and third embodiments, the direction of adjustment and the position of the adjustment position are sent to the servo motor and stepping motor, etc. Since the laminated structure being produced is laminated so that the displacement directions of each other cancel each other, a straight upright laminated structure can be manufactured.

As described above, according to the present invention, since the cumulative displacement due to the lamination of thin plates can be suppressed, it is useful for reducing the lamination appearance (taole, twist, fastening force reduction) and product appearance deterioration.

1. Laminated structure manufacturing apparatus 1a. Laminated steel sheet 1
1b. Laminated structure 1c of laminated steel plate 1c. Laminated steel sheet A
1d. Laminated steel sheet B
1e. Laminated steel sheet C
1f. Laminated structure 2a. Punch holder (upper die)
2b. Guide post 2c. Backing plate 2d. Punch plate 2e. Guide stripper plate 2f. Punch 2g. Punch guide bush 2h. Guide post bush 2i. Die holder 2j. Die 2k. Material guide 3a. Eccentric die A
3b. Eccentric die B
3c. Eccentric die C
3d. Eccentric die D
3e. Unevenness forming process 3f. Material guide 3g. Die plate 3h. Guide post bush 3i. Progressive die cutting layout 3j. Laminated structure 4a. Eccentric die E
4b. Die bushing 4c. Die bush drive gear (ball screw)
4d. Rotation drive source (servo motor, stepping motor, etc.)
4e. Progressive die cutting layout 4f. Laminated structure 5a. Eccentric die F
5b. Die bushing 5c. Rotation drive source (servo motor, stepping motor, etc.)
5d. Progressive die cutting layout 5e. Laminated structure 5f. Punch plate 5g. Punch guide plate 5h. Punch guide bush 6a. Sensor A
6b. Sensor B
6c. Sensor C
6d. Sensor D
6f. Rotation drive source A (servo motor, stepping motor, etc.)
6e. Rotation drive source B (servo motor, stepping motor, etc.)
7a. Punch 7b. Steel plate 7c. Die

Claims (11)

The plate is formed by laminating a plurality of plate-shaped steel plates each having an outer periphery formed in a plate thickness direction and a circular convex portion and an inner periphery formed on a surface opposite to the plate thickness direction of the convex portion. In the laminated structure formed by fitting the convex portions of the plate steel plates facing each other into the concave portions of the plate steel plates ,
In the sheet steel plate, the central axis of the convex portion and the central axis of the concave portion are separated from each other, and a plurality of the plate steel plates having different separation directions are laminated in the plate thickness direction. A laminated structure characterized in that a separating direction of a central axis of a convex portion and a central axis of a concave portion in the structure does not overlap in a certain direction.

Laminating a plurality of plate-shaped steel plates each having a circular convex portion on the outer periphery formed in the plate thickness direction and a concave portion having a circular inner periphery formed on the opposite surface of the convex portion in the plate thickness direction, in the recess of the, in the laminated structure manufacturing method the plate steel sheets to produce a laminated structure that will be fixed by fitting the convex portion of another of said plate-shaped steel facing,
A first step of forming the recesses in the plate-like steel sheet by pressing in the recess-forming means comprising the plate-like steel columnar structure,
A second step of forming the protrusions on the plate-shaped steel sheet received by the convex portion forming means comprising the plate-like steel sheet is pressed by said recess forming means from the tubular structure,
A third step of punching out the plate-like steel sheet in which the convex portion and the concave portion are formed by the first step and the second step;
A fourth step of laminating a plurality of the plate-like steel plates produced in the third step in the thickness direction ;
With
In the first step and the second step, the plate steel plate is separated from the central axis of the convex portion and the central axis of the concave portion in one sheet steel plate, and the third step is different from the separation direction. A plurality of layers are manufactured and laminated by the fourth step so that the separating direction of the central axis of the convex portion and the central axis of the concave portion in the laminated structure does not overlap in a certain direction. Structure manufacturing method. In said first step, said recess forming means spaced directions of the center axis of said the center axis recess of the convex portions to produce a plurality of different said plate-like steel sheet, Ru a plurality in advance in correspondence to the detaching direction layered structure manufacturing method according to claim 2, characterized in that. In the second step, a plurality of the convex portion forming means for preparing a plurality of the sheet steel plates having different separation directions between the central axis of the convex portion and the central axis of the concave portion are provided in advance corresponding to the separation direction. layered structure manufacturing method according to claim 2, characterized in Rukoto. The projection forming means, according to claim 2, characterized in that have a rotating means for rotatably forming a separating direction of the center axis of the recess and the central axis of the convex portion in one of said plate-shaped steel 2. A method for producing a laminated structure according to 1 . 6. The method for manufacturing a laminated structure according to claim 5 , wherein a plurality of the convex forming means having the rotating means are provided in the second step . The method for manufacturing a laminated structure according to claim 6, wherein the plurality of convex portion forming means operate in conjunction with each other by the operation of the rotating means. It said recess forming means to claim 2, characterized in that have a rotating means for rotatably forming a separating direction of the center axis of the recess and the central axis of the convex portion in one of said plate-shaped steel The laminated structure manufacturing method as described. 9. The method for manufacturing a laminated structure according to claim 8, wherein a plurality of the recess forming means having the rotating means are provided in the second step. The laminated structure manufacturing method according to claim 9, wherein a plurality of the recess forming means operate in conjunction with each other by the operation of the rotating means. In the fourth step, a detection means for detecting an aspect of the laminated structure is provided, and based on information from the detection means, the central axis of the convex portion and the central axis of the concave portion in the laminated structure are separated. layered structure manufacturing method according to any one of claims 2 to 10 distance is characterized that you laminate to minimize.

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