JP3149217B2 - Multi-row punching method for laminated iron sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated iron sheet for punching a thin sheet material for an iron core in a multi-row state of three or more rows using a progressive die apparatus in order to manufacture a laminated core such as an electric motor. And a multi-row punching method.

[0002]

2. Description of the Related Art A laminated iron core of this type is punched in the order of slot punching, shaft hole punching, and external punching on a thin sheet material (strip material) for an iron core by a progressive die apparatus, and is laminated in the same shape. A core is manufactured, and the lamination core is laminated and caulked in a mold simultaneously with the punching of the outer shape, or the lamination core is taken out of the mold and laminated and caulked in a separate process to manufacture a product. Further, when the core for lamination is punched, at least three sheets of the core sheet are progressively cut by a progressive die device from the advantages of improving the yield of the core sheet material and improving the work efficiency. A method of sequentially performing product punching for more than one row is used for each row. For example, as shown in a layout diagram shown in FIG. 5, a thin sheet material W for an iron core which is intermittently fed at a predetermined pitch P in a feeding direction F between progressive die apparatuses (not shown) first has a center line 1 along the center. The second-row product punching along one end is performed after the lamination core W1 is pulled out after the product punching of the row is performed in the order of the slot punching step A1-the shaft hole punching step B1-the outer shape punching step C1. Processing (A
2-B2-C2) is performed next to remove the lamination core W2, and the third row of product punching (A) along the other end side is performed.
3-B3-C3) is performed last, and the lamination core W3 is pulled out.

[0003]

However, in this case, the lamination cores W1 punched in the first row and the lamination cores W2 and W3 punched thereafter have variations in product accuracy such as dimensions. In particular, the more the core for lamination is punched later, the greater the variation, which deteriorates the performance of the laminated product. In other words, the narrow bridge B remaining between the outer punching holes H, H previously punched causes deformation, such as extension, bending or undulation, of the iron core sheet material W, and also causes the core thin sheet W to deform. When the next punching process is performed adjacent to the outer shape punching hole H on the plate material W, it cannot be uniformly supported, so that the punched lamination core has a large difference in product accuracy for each row. I will. In view of the above, an object of the present invention is to provide a multi-row punching method for laminating thin plates in which the lamination cores punched in three or more rows in a multi-row state have uniform product accuracy regardless of the row. It is assumed that.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a method of punching at least three or more rows of a thin sheet material for an iron core sequentially by a progressive die apparatus for each row. Bridges remaining between the outer punching holes adjacent in the feed direction of the punched row are cut and separated in advance before starting the punching of the row to be subjected to the next product punching, and the separated core The sheet material is fed out while being guided in a supported state by a central guide member provided on the die side in the feed direction adjacent to the row where the product is to be punched next, and the next product punching is performed. This is a multi-row punching method for thin sheets of steel.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. FIG. 1 is an overall perspective view illustrating a multi-row punching method of the present invention, and FIG. 3 is a front view of a main part of a progressive die apparatus for performing the multi-row punching method. As shown in FIG.
The strip-shaped iron core sheet material W in the form of a strip is intermittently and sequentially fed at a predetermined pitch P in the feed direction F between the upper die 1 and the lower die 2. Three rows of product punching processes are sequentially performed on the iron core sheet material W for each row. In FIG. 3, the slot punching step A1-shaft hole punching step B1-outline punching step C1 in which the first row of product punching is performed and the second row slot punching step A2
Up to the mold apparatus portion, and the illustration of the second and subsequent columns of the same configuration, which are subsequently provided, is omitted.

In order to perform the above-described product punching process, the upper die 1 is equipped with a slot punch 3, a shaft hole punch 4 and an outer shape punch 5, respectively.
The lower die 2 is provided with an outer shape punching die 6 and other dies corresponding to these punches, respectively, facing each other. Further, in the mold apparatus of this embodiment, a caulking protrusion is formed for caulking and fixing each of the lamination cores W1 sequentially punched in the outer shape punching step and dropped to the outer shape punching die 6 in a stacked state. The punch 7 for staking and the die 8 for swaging are provided between the shaft hole punching step and the outer shape punching step. Reference numeral 9 denotes a stripper plate that separates the iron core sheet material W from each punch after punching, and reference numeral 10 denotes a stripper plate.
Is a guide post for slidingly guiding the upper mold 1 to the lower mold 2 side, and each of the above-mentioned structures is conventionally used.

In order to carry out the multi-row punching method of the present invention, the progressive die apparatus is provided with the following new configuration in addition to the above configuration. That is, as shown in FIG.
Immediately before the completion of 1 and immediately before the start of the slot punching process A2 in the second row, the narrow width bridge B remaining between the outer punched holes H, H already punched in the feed direction F is cut, As shown in FIG. 2A, the upper die 1 is provided with a punch 12 for punching a bridge, and the lower die 2 is provided with a die 13 for punching a bridge. Further, with respect to the iron core sheet material W separated by the formation of the slits 11, the shafts of the outer shape punching holes H, H cooperate with the conventional two side guide members 14, 14 provided on both sides in the width direction. A central guide member 15 for supporting a cut portion along the center is provided on the lower mold 2. The center guide member 15 is provided in each of the slot punching processes A in the second and third rows.
2B, the lower die 2 is protruded from the center of the lower die 2 adjacent to A3, supports the lower surface of the iron core sheet material W with the shoulder portion separated, and has a tip portion inserted through the slit 11. Then, the separated thin iron core sheet material W is guided horizontally in the feed direction F.

As described above, in this embodiment, in the case where three rows of product punching are sequentially performed on the thin sheet material W for the iron core by the progressive die apparatus for each row, one row of the product previously punched is used. Bridge B of each external punching hole H, H
Next, the second row slot punching process A for punching products
By cutting in advance before the start of Step 2, the iron core sheet material W is separated into the first and second rows and the first and third rows, respectively. The deformation such as elongation, bending, or undulation of the iron core sheet material W that occurred when performing the product punching process is prevented, and the first laminated core W1 and the second laminated core W2 punched thereafter are prevented.
A uniform product with little variation in product accuracy such as dimensions in W3 can be obtained. Further, the separated iron core sheet material W is horizontally oriented in the feeding direction F in a state where the lower surface is supported by the central guide member 15 protruding from the lower die 2 engaging with the slits 11 formed between the rows. When the second and third rows of product punching are performed, the sheet material W for the iron core is evenly supported and the punching accuracy is improved, so that the product accuracy of the cores W2 and W3 for lamination is improved. A uniform product with little variation can be obtained.

In the above embodiment, a three-row configuration is shown.
The present invention is not limited to this, and can be applied to a multi-row configuration of four to six rows as shown in FIG. 4, for example.
FIG. 4A shows a five-row configuration. In this case, two rows closer to the center, which are located at even-numbered positions from one end side, are arranged ahead of one another.
If the first row is punched at the same time, and the first row is subjected to the same processing as in the above-mentioned third row, and the second row and the subsequent rows are punched, the above-mentioned three rows are executed. The same effect as the example can be obtained. FIG. 4 (b) shows a four-row configuration. In this case, as in the above-mentioned three-row example, the three-row arrangement is performed with respect to the first row, which is located closer to the center and located even-numbered from one end. In addition to performing the same processing as in the embodiment, the discard holes 16 are punched between the row located on the other end side and the inner row, and the respective discard holes 16, 16 adjacent in the feed direction of this discard hole row are processed. The bridge portion left in between is cut and separated in advance before the second-row product punching process, and the separated portion is guided in a supported state by the same guide member as in the above-described three-row embodiment. If the punching of the products in the second and subsequent rows is performed, the same effect as in the above-described three-row embodiment can be obtained. FIG. 4C shows a configuration of six rows. In this case, as in the example of the five rows described above, two rows closer to the center located at an even-numbered position from one end side are preceded and simultaneously punched as the first row. The same processing as in the above-described three-row embodiment is performed on the first row, and a discard hole is provided between the row located on the other end side and the inner row similarly to the above-described four-row example. 16
And a bridge portion remaining between the discard holes 16 adjacent to each other in the feed direction of the discard hole row is removed by two.
Before the product punching process in the row, cut and separate in advance,
If the separated portion is guided by a guide member similar to that of the above-described embodiment in a supported state and the second and subsequent rows of the product are punched, the same effects as in the above-described third-row embodiment can be obtained.

[0010]

As is apparent from the above-described embodiments, according to the multi-row punching method for a laminated iron core sheet according to the present invention, the bridge of the row previously punched is cut, and then the punching is performed. In the state of being separated from the part of the core sheet material of the succeeding row, the separated core sheet material is sent out while being guided in a supported state by the central guide member provided on the die side, and the next product Since the punching process is performed, when performing the product punching process of the succeeding row, there is no influence of material deformation or the like due to the processing of the previous row as in the related art. Therefore, the cores for lamination punched in each row are uniform and high in accuracy, and the quality of products such as electric motors laminated with the cores for lamination is also high.

[Brief description of the drawings]

FIG. 1 is an overall perspective view illustrating a multi-row punching method according to the present invention.

FIG. 2 is a sectional view of an essential part for explaining a multi-row punching method of the present invention.

FIG. 3 is a front view of a main part of a progressive die apparatus for performing the multi-row punching method of the present invention.

FIG. 4 is a plan view illustrating another embodiment of the multi-row punching method according to the present invention.

FIG. 5 is a plan view showing a layout of a conventional multi-row punching method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper die 2 lower die 3 slot punch 4 punch for shaft hole punch 5 external punch 6 outer punch 7 die for caulking protrusion 8 die for caulking protrusion 9 stripper plate 10 guide post 11 slit 12 punch for bridge punch 13 Bridge punching die 14 Both side guide member 15 Central guide member 16 Discard hole A1, A2, A3 Slot punching process B Bridge B1, B2, B3 Shaft hole punching process C1, C2, C3 Outline punching process F Feeding direction H External punching hole P Feed pitch W Iron core sheet material W1, W2, W3 Lamination core

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 28/02 B21D 28/04 B21D 43/05

Claims (1)

(57) [Claims] 1. A method of sequentially punching at least three or more rows of products from a thin sheet material for an iron core using a progressive die apparatus for each row, wherein the punching process is performed adjacent to a row in which a product has been punched in advance. The bridge remaining between the outer punching holes is cut and separated in advance before starting the punching of the next product punching row, and the separated sheet material for the iron core is used in the next product punching row. A plurality of rows of thin sheets for a laminated core, which are fed out while being guided in a supported state by a central guide member provided on the die side in the feed direction and adjacent to the die, and the next product punching is performed. Punching method.