JP2016019413A - Processing method of laminate material - Google Patents

Abstract

[Problem] To provide a method for processing laminated materials that can perform highly accurate punching without deforming the periphery of a pilot hole by a pilot pin by preventing the thin plates from shifting when punching a plurality of thin plates arranged in a stack. [Solution] A crimp group 13 having a plurality of crimp portions 14, 15 with different orientations is formed on a plurality of thin plates 10 arranged in a stack, and after fixing the position of the thin plates 10 in the stacked state, a preset punching process is performed on the thin plates 10 positioned by the pilot holes 12. [Selected Figure] Figure 1

Description

  The present invention relates to a processing method of a laminated material in which punching is performed on a plurality of thin plate materials arranged in an overlapping manner.

In the production of laminated iron cores, for the purpose of improving productivity, a method for obtaining a laminated iron core by punching a plurality of thin steel plates (thin plate materials) that are magnetic steel plates has been conventionally proposed. .
For example, when two thin sheet materials are stacked and punched, the two stacked thin sheet materials are fed into a mold apparatus (punching apparatus) so as not to be displaced from each other. Specifically, a method of joining thin plates by performing caulking or spot welding at a position separated by a certain distance in the feed direction with respect to the stacked thin plates (for example, see Patent Document 1), A method of welding and integrating the end surfaces on one side (see, for example, Patent Document 2) is known. In general, caulking is widely used because of the improvement of productivity and cost reduction of facilities and the like.

  By the way, normally, when a thin plate material is formed by punching with a mold apparatus, as shown in FIGS. 3A and 3B, in order to accurately position the thin plate material 70 at the processing position of the mold apparatus 71, A pilot hole 72 is formed in the thin plate material 70, and a pilot pin 73 of the mold apparatus 71 is fitted into the pilot hole 72 to position the thin plate material 70 and perform punching. When the punching process is completed, the upper die 74 is raised and the pilot pin 73 is raised, the pilot pin 73 is removed from the pilot hole 72, and the thin plate material 70 is sent to the next punching station. 3A and 3B, reference numeral 75 denotes a lower die to which a die is fixed, and m denotes a center line (center line).

JP 52-39880 A JP 2005-348456 A

However, as shown in FIGS. 4A to 4C, when joining the vicinity of the end portions on both sides in the width direction of the two stacked thin plate members 70 with the caulking 76, depending on the formation position and shape of the caulking 76, Since the two thin plate members 70 may be displaced in the feeding direction of the thin plate member 70, the center positions of the pilot holes 72 respectively formed in the two thin plate members 70 are also displaced.
Therefore, when the pilot pin 73 is inserted into the pilot hole 72 and positioned, the periphery of the pilot hole 72 is deformed, and when the pilot pin 73 is removed from the pilot hole 72, the pilot pin 73 is If it is difficult to pull out, there is a problem that the periphery of the pilot hole 72 is deformed by forcibly pulling it out.
As described above, when the periphery of the pilot hole 72 is deformed, there is a problem that positioning accuracy using the pilot hole 72 is remarkably lowered in the subsequent steps.

  The present invention has been made in view of such circumstances, and when performing a punching process on a plurality of stacked thin plate materials, the periphery of the pilot hole is prevented by a pilot pin by preventing a shift between the thin plate materials. It aims at providing the processing method of the laminated material which can perform a highly accurate punching process, without deforming.

  In the processing method of the laminated material according to the present invention that meets the above-described object, a plurality of thin plate materials that are stacked are formed with a plurality of crimped portions having different directions, and the positions of the thin plate materials in a stacked state Then, a preset punching process is performed on the thin plate material positioned by the pilot hole.

In the method for processing a laminated material according to the present invention, the caulking groups are formed on both sides in the width direction of the thin plate material, and the pilot holes are formed between adjacent caulking portions constituting the caulking group. It is preferable.
Here, the formation positions of the caulking groups on both sides in the width direction of the thin plate material are preferably symmetric with respect to the center position in the width direction of the thin plate material.

In the method for processing a laminated material according to the present invention, it is preferable that the caulking group is further formed at a central portion in the width direction of the thin plate material. In addition, the width direction center part of a thin-plate material does not need to be the center position of the width direction completely, and should just be a substantially center (part except the width direction both ends).
Here, it is preferable that the caulking group at the center portion in the width direction of the thin plate material is formed in a region discarded by the punching process or a region that becomes a remaining material after the punching process.

  In the method for processing a laminated material according to the present invention, the caulking group is composed of the caulking portions that form a pair, and the direction of one of the caulking portions is a feeding direction of the thin plate material, and the direction of the other caulking portion is the direction of the caulking portion. The direction perpendicular to the feeding direction of the thin plate material is preferable.

  In the method of processing a laminated material according to the present invention, the caulking portion is formed in a rectangular shape in plan view, and one side of the short side facing the caulking portion is separated from the thin plate material, and the other side is thinned. It is preferable to bend the plate material.

In the method for processing a laminated material according to the present invention, a plurality of thin plate materials arranged in a stack form a crimped group having a plurality of crimping portions having different directions, so that the position of the stacked thin plate materials can be fixed. Thereby, since the thin plate materials do not deviate from each other, the center positions of the pilot holes formed in the respective thin plate materials always coincide with each other.
Therefore, when inserting the pilot pin into the pilot hole or when removing the pilot pin from the pilot hole, the periphery of the pilot hole is not deformed, and the positioning accuracy of the pilot hole is excellent. Can be punched with high precision.

Further, when the caulking group is formed at the center in the width direction of the thin plate material, for example, even a wide thin plate material in which the stacked thin plate materials are likely to be displaced can be prevented from occurring.
Here, a place for forming the caulking group is newly formed by forming the caulking group in the central portion in the width direction of the thin plate material in an area discarded by the punching process or an area that becomes a remaining material after the punching process. There is no need to secure it.

It is explanatory drawing of the processing method of the laminated material which concerns on one embodiment of this invention. (A)-(C) is explanatory drawing of the crimping part which concerns on a modification, respectively. (A) is explanatory drawing which shows the fitting state of the pilot pin to a pilot hole, (B) is explanatory drawing which shows the de-hole state of the pilot pin from a pilot hole. (A) is a perspective view which shows the joining state of the two laminated | stacked thin board | plate materials, (B) is a top view of the crimping of a junction part, (C) is a sectional side view of (B).

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, the laminate material processing method according to an embodiment of the present invention performs thinning when punching a plurality of thin plate materials 10 (which constitute a laminate material) arranged in a stacked manner. This is a method in which the punching process with high accuracy can be performed without deforming the periphery of the positioning pilot hole 12 by the pilot pin 11 by preventing the displacement between the plate members 10.

Hereinafter, the case where the processing method of the laminated material which concerns on this Embodiment is applied to manufacture of a laminated iron core is demonstrated. The laminated iron core may be either a rotor (rotor) or a stator (stator).
Here, the thin plate material 10 used for manufacturing the laminated iron core is a strip made of an electromagnetic steel plate having a thickness of, for example, about 0.10 to 0.5 mm (here, 0.25 mm). The number of laminated thin plate members 10 is two. However, depending on the thickness of the thin plate member or the like (in the case of being thin), for example, the number may be three or more.

First, the caulking portion forming process will be described.
In this step, the caulking group 13 is formed on a plurality of thin plate members 10 arranged in an overlapping manner.
The caulking group 13 includes caulking portions 14 and 15 that form a pair. Each of the caulking portions 14 and 15 is formed by cutting and bending (also referred to as half-cutting or half-bending), but may have various shapes conventionally used such as trapezoidal shape, V shape, and round flat shape. The cutting process is a process of forming a rectangular shape in plan view, and is formed by separating one side 16 of the opposing short side from the thin plate material 10 and bending the other side 17 with respect to the thin plate material 10. . The bending inclination angle is, for example, 20 to 45 degrees with respect to the surface of the thin plate material 10.

The caulking portions 14 and 15 that form a pair have different directions.
Here, “different directions” means that the directions (directions) of the long sides 18 of the caulking portions 14 and 15 are different directions (intersection directions) in plan view.
Usually, the caulking portion is formed so that the caulking portion formed on one thin plate material protrudes toward the other thin plate material so that the stacked thin plate materials do not deviate from each other. However, when there is one caulking portion, the thin plate materials are likely to be displaced along the direction of the caulking portion.
Therefore, as described above, by changing the direction of the caulking portion, the position of the stacked thin plate members 10 can be fixed by the synergistic effect of the caulking portion 14 and the caulking portion 15 (can be brought into a state in which no deviation occurs). .

The caulking group 13 is formed on both sides in the width direction of the thin plate member 10 with the caulking portions 14 and 15 as one set (one set). The positions where these caulking groups 13 are formed are symmetrical with respect to the center position (center line m) in the width direction of the thin plate member 10, but may be asymmetrical positions.
In particular, here, a planned formation position 19 of the pilot hole 12 formed in a pilot hole forming step described later is set between the adjacent caulking portion 14 and the caulking portion 15 constituting the caulking group 13. . Thereby, the shift | offset | difference of the center position of the pilot hole 12 each formed in the two thin board | plate materials 10 can be prevented more effectively.

The caulking portions 14, 15 are formed with respect to the pilot hole 12 (formation formation position 19). One caulking portion 14 is on the upstream side in the feed direction of the thin plate material 10, and the other caulking portion 15 is a thin plate material. 10 on the downstream side in the feed direction.
The direction of one caulking portion 14 (the direction of the long side 18) is the feeding direction of the thin plate material 10 (the length direction of the thin plate material 10), and the direction of the other caulking portion 15 is the feeding direction of the thin plate material 10. It is set as the direction (width direction of the thin board | plate material 10) orthogonal to.

Further, the two caulking portions 14 formed on both sides in the width direction of the thin plate material are positions of one side 16 (separated portion) and the other side 17 (folded portion) with respect to the short sides opposed in the feeding direction of the thin plate material 10. Are opposite positions (the separation position and the bending position are different), but they may be the same position.
Further, in the two caulking portions 15 formed on both sides in the width direction of the thin plate material, the positions of the one side 16 and the other side 17 are opposite positions with respect to the short sides facing each other in the width direction of the thin plate material 10. The same position may be used.

Note that the caulking portions 14 and 15 constituting the caulking group 13 are not limited to the above-described configuration, and for example, can be configured as shown in FIGS.
In the caulking portions 14 and 15 shown in FIG. 2A, the direction of the one caulking portion 14 described above is the width direction of the thin plate material 10, and the direction of the other caulking portion 15 is the feeding direction of the thin plate material 10. (The formation positions of the caulking portion 14 and the caulking portion 15 shown in FIG. 1 are interchanged). Note that the caulking portions 14 and 15 (that is, the caulking group 13) that form a pair are formed symmetrically with respect to the center line m in the width direction of the thin plate member 10.

Further, the caulking portions 14 and 15 shown in FIG. 2B are configured such that the direction of the one caulking portion 14 described above is inclined with respect to the feeding direction of the thin plate material 10 and the direction of the other caulking portion 15 is changed to the thin plate material. 10 is inclined with respect to the width direction. Note that the caulking portions 14 and 15 (that is, the caulking group 13) that form a pair are formed symmetrically with respect to the center line m in the width direction of the thin plate member 10.
The caulking portion 14 shown in FIG. 2C is obtained by further increasing the inclination direction of the caulking portion 14 shown in FIG. Note that the caulking portions 14 and 15 (that is, the caulking group 13) that form a pair are formed asymmetrically with respect to the center line in the width direction of the thin plate member 10.

Furthermore, the above-mentioned caulking group can be formed also in the central portion in the width direction of the thin plate material. Thereby, it is possible to more effectively prevent the occurrence of deviation with respect to a thin plate material having a wide width (for example, 50 cm or more, and further 100 cm or more).
In addition, as described above, when a caulking group is formed in the center portion in the width direction of a thin plate material, it is an area (scrap area) discarded by a punching process, which will be described later, or an area (residual material) remaining after the punching process. (Material region) is preferably formed. Thereby, it is not necessary to secure a new place for forming the caulking group, and the thin plate material can be used without waste.

After the caulking portions 14 and 15 are formed on the plural thin plate materials 10 arranged in the above manner, the thin plate material 10 is sent to the pilot hole forming step as shown in FIG.
In this step, the pilot hole 12 is formed at the planned formation position 19 of the pilot hole 12 in a state where the positions of the plurality of thin plate members 10 are fixed by the caulking portions 14 and 15.
Then, while repeatedly inserting the pilot pin 11 into the pilot hole 12 and removing the pilot pin 11 from the pilot hole 12 by a mold device (not shown), the thin plate material 10 positioned in the pilot hole 12 is The preset punching process shown below is performed.

First, in the slot forming step, the slot 20 is formed (punched).
Next, in the product caulking hole forming step, the caulking hole 21 is formed (punched). If the caulking hole 21 is not formed, the caulking protrusion 22 is formed in the product caulking protrusion forming step.
Then, after performing the inner shape removal step in the inner shape removal step, the core piece 23 is punched out in the outer shape removal step, and a plurality of the core pieces 23 are laminated to manufacture a laminated core.
In the case where the caulking group is formed in the center portion in the width direction of the thin plate material, the caulking group is preferably formed in the above-described slot forming region or the region without the internal shape. However, when a caulking group is formed in a region (scrap region) to be discarded by punching, there is a possibility that the stacked thin plate materials are displaced in the process after the punching region is punched. In such a case, a caulking group is formed on the thin plate material (that is, the region that becomes the remaining material after the punching process) near the center in the width direction (substantially the center) of the thin plate material and after the outer shape punching process is completed. Accordingly, it is possible to reliably prevent the thin plate materials from shifting to the outer shape removal step.

Thereby, since the shift of the center position of the pilot hole 12 formed in each of the plurality of thin plate members 10 can be prevented, the pilot pin 11 is inserted from the pilot hole 12 when the pilot pin 11 is inserted into the pilot hole 12. When the holes are removed, the pilot holes 12 can be prevented from being deformed.
Therefore, the positioning accuracy of the pilot hole 12 is excellent, and the thin plate material 10 can be punched with high accuracy.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the laminated material processing method of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
For example, in the above-described embodiment, the case where the laminated core is processed using the method for processing a laminated material according to the present invention has been described. However, the present invention is not limited to this, and a plurality of stacked layers are arranged. The present invention is applicable to a case where a thin plate material is punched with a mold apparatus. In this case, the number of thin sheet materials to be stacked, the thickness and width of the thin sheet materials, and the like can be variously changed according to the application.

Further, in the embodiment, the case where the caulking portion forming step and the pilot hole forming step are sequentially performed in a state where a plurality of thin plate materials are stacked has been described, but the caulking portion forming step is the pilot hole forming step. It can also be performed simultaneously, or can be performed after (immediately after) the pilot hole forming step.
Furthermore, in the said embodiment, although the case where the caulking group was comprised by the caulking part used as a pair was demonstrated, it can also be comprised by a 3 or more several caulking part. In this case, it is only necessary that at least two (or all) caulking portions have different directions.

10: thin plate material, 11: pilot pin, 12: pilot hole, 13: caulking group, 14, 15: caulking part, 16: one side, 17: other side, 18: long side, 19: formation position, 20: slot , 21: caulking hole, 22: caulking protrusion, 23: iron core piece

Claims (7)

  After forming a plurality of caulking groups having a plurality of caulking portions in different directions on a plurality of thin plate materials arranged in an overlapping manner, and fixing the position of the thin plate material in a stacked state, the thin plate material positioned by a pilot hole On the other hand, the laminated material processing method characterized by performing preset punching.   2. The method for processing a laminated material according to claim 1, wherein the caulking group is formed on both sides in the width direction of the thin plate material, and the pilot holes are formed between adjacent caulking portions constituting the caulking group. A method for processing a laminated material.   3. The method for processing a laminated material according to claim 2, wherein the formation positions of the caulking groups on both sides in the width direction of the thin plate material are symmetrical with respect to the center position in the width direction of the thin plate material. Laminate processing method.   4. The method for processing a laminated material according to claim 2, further comprising forming the caulking group at a central portion in the width direction of the thin plate material.   5. The method for processing a laminated material according to claim 4, wherein the caulking group at the center portion in the width direction of the thin plate material is formed in a region discarded by the punching process or a region that becomes a remaining material after the punching process. A method for processing a laminated material.   In the processing method of the laminated material of any one of Claims 1-5, the said caulking group is comprised by the said caulking part used as a pair, and the direction of one said caulking part is made into the feed direction of the said thin plate material. The method of processing a laminated material, wherein the direction of the other caulking portion is a direction orthogonal to the feeding direction of the thin plate material.   7. The method for processing a laminated material according to claim 1, wherein the caulking portion is formed in a rectangular shape in plan view, and one side of the short side facing the caulking portion is thin. A method for processing a laminated material, wherein the laminate is cut from a plate material, and the other side is bent with respect to the thin plate material.

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