Progressive mold device and method for manufacturing iron core thin plate

Abstract

The degree of freedom of the arrangement position of a guide pin is improved. A plurality of guide holes (P) are punched and formed at each transfer of the intermittently transferred strip-shaped sheet (F), the guide pin (80) is arranged to use one of the plurality of guide holes (P) in one of the processing stages, and the guide pin (80) is arranged to use a guide hole other than the one of the plurality of guide holes (P) in another of the processing stages.

Description

Technical Field

[0001] This invention relates to a progressive die apparatus for manufacturing thin iron core sheets and a method for manufacturing thin iron core sheets. Background Technology

[0002] Previously, progressive dies were known as manufacturing apparatuses for laminated cores (core sheets) used in motors and similar applications. These progressive dies consist of multiple processing stations where a strip of sheet material is sequentially processed as required. At each processing station, punching of guide holes (positioning holes), punching of internal shapes (internal shapes of grooves, teeth, etc.), formation of riveting parts, and application of adhesive are performed as needed. Thus, the shapes of the individual sheets constituting the laminated core are continuously formed within the strip of sheet material being transported within the progressive die. Finally, the core sheets, whose shapes have been punched from the strip of sheet material, are fixed in the progressive die in a state where a predetermined number of sheets are stacked, thereby completing the laminated core process.

[0003] In the manufacture of a thin iron core sheet using a progressive die, the strip sheet is intermittently conveyed at a predetermined interval (hereinafter referred to as the transfer interval). Guide pins engage with guide holes formed in the strip sheet, thereby positioning the strip sheet relative to the progressive die. In the positioned state, predetermined processes such as internal blanking and external blanking are performed at each processing station (e.g., Patent Document 1, Patent Document 2). Sometimes, movable parts such as plate cams and rotary dies are provided in the progressive die, which can change the effective length of the punch used for riveting to perform measurement.

[0004] Regarding the guide holes, as the initial step in the manufacturing of the core sheet using progressive dies, one guide hole is provided on each of the two sides of the aforementioned strip sheet during each intermittent transfer. In this installation, the guide holes are arranged along the sides of the strip sheet at intervals equal to the transfer distance in the transfer direction.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2015-5649

[0008] Patent Document 2: Japanese Patent Application Publication No. 2021-93908 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The guide holes are spaced at intervals equal to the conveying distance of the strip sheet, resulting in limited freedom of positioning. Furthermore, the positioning of the guide pins that engage with the guide holes also has limited freedom. Therefore, even when the position of the guide pins is changed within the possible range, interference between the guide pins and movable parts such as the plate cam and rotating die is sometimes unavoidable. To avoid such interference, the construction of the movable parts needs to be complicated, leading to reduced component strength, operability, and maintainability.

[0011] In view of the above background, the objective of this invention is to increase the degree of freedom in the placement of guide pins.

[0012] Methods for solving problems

[0013] To address the aforementioned issues, one aspect of the present invention is a progressive die apparatus that manufactures a core sheet of a predetermined shape by performing a predetermined process on a strip sheet intermittently conveyed at predetermined intervals in each of a plurality of processing stations, wherein the plurality of processing stations are arranged in the conveying direction of the strip sheet, wherein the progressive die apparatus includes: a guide hole forming part that punches out a plurality of guide holes during each conveying of the intermittently conveyed strip sheet; and at least one guide pin that is correspondingly provided to each of the processing stations and engages with the corresponding guide hole to position the strip sheet in each processing station, wherein in one processing station of the processing station, the guide pin is configured to engage with one of the plurality of guide holes, and in another processing station of the processing station, the guide pin is configured to engage with a guide hole other than the one of the plurality of guide holes.

[0014] According to this method, the degree of freedom in the configuration position of the guide hole that engages with the guide pin increases, and consequently, the degree of freedom in the configuration position of the guide pin also increases.

[0015] In the above-described manner, the guide hole forming portion may also be configured such that the plurality of guide holes are arranged in the conveying direction.

[0016] According to this method, the degree of freedom in the placement of the guide pins increases with respect to the conveying direction of the strip sheet.

[0017] In the above-described manner, the guide hole forming portion may be configured such that the plurality of guide holes are arranged along the respective side edges of the two side edges of the strip plate in the conveying direction.

[0018] According to this method, the degree of freedom in the configuration position of the guide pins increases with respect to the conveying direction of the strip plate at positions corresponding to each side edge of the strip plate.

[0019] In the above method, each processing station of the processing table is provided with a processing component that performs a specified processing on the strip sheet, and the guide pin in each processing station engages with a plurality of guide holes formed at multiple locations in the transfer direction, which do not interfere with the processing component.

[0020] According to this method, the degree of freedom in the placement of the guide pins increases with respect to the conveying direction of the strip sheet.

[0021] In the above-described manner, one of the processing stations includes a riveting part forming station, which has: a riveting part forming punch and a riveting part forming die, which form a riveting part on the strip-shaped thin plate; and a cam, which increases or decreases the effective length of the riveting part forming punch, wherein the processing component that interferes with the guide pin is the cam.

[0022] This method can prevent interference between the guide pin and the cam.

[0023] In the above-described manner, one of the processing stations includes an adhesive coating station, which has an adhesive coating device for coating adhesive onto the strip sheet. The processing component that interferes with the guide pin is the adhesive coating device.

[0024] This method can prevent interference between the guide pin and the adhesive coating device.

[0025] In the above manner, as one of the processing tables, there is a blanking table having a punch and a rotary die, and the processing component that interferes with the guide pin is the rotary die.

[0026] This method can prevent interference between the guide pin and the rotating die.

[0027] To address the aforementioned issues, one aspect of the present invention is a method for manufacturing a thin iron core plate. This method utilizes a progressive die device to perform a predetermined process on a strip of thin plate intermittently conveyed at predetermined intervals in each of a plurality of processing stations to manufacture a thin iron core plate of a predetermined shape. The plurality of processing stations are arranged in the conveying direction of the strip of thin plate. The method comprises: during each conveying of the intermittently conveyed strip of thin plate, punching a plurality of guide holes using a guide hole forming part; engaging at least one guide pin corresponding to each processing station with the corresponding guide hole to position the strip of thin plate in each processing station; and using one of the plurality of guide holes in one processing station and using guide holes other than the one guide hole in another processing station.

[0028] According to this method, the degree of freedom in the configuration position of the guide hole that engages with the guide pin increases, and consequently, the degree of freedom in the configuration position of the guide pin also increases.

[0029] Alternatively, in the above method, the plurality of guide holes may be arranged in the conveying direction.

[0030] According to this method, the degree of freedom in the placement of the guide pins increases with respect to the conveying direction of the strip sheet.

[0031] Invention Effects

[0032] Based on the above method, the placement of the sales guides becomes more flexible. Attached Figure Description

[0033] Figure 1 This is a top view showing a specific example of the core sheet used in laminated cores.

[0034] Figure 2 This is an explanatory diagram showing the strip layout in the case of a single row of progressive die apparatus according to Embodiment 1 of the present invention.

[0035] Figure 3 This is a cross-sectional view of the progressive die device according to Embodiment 1.

[0036] Figure 4 It is along Figure 3 A sectional view of line XX.

[0037] Figure 5 This is an explanatory diagram showing the strip layout in the case of a double-row progressive die device according to Embodiment 1.

[0038] Figure 6 This is an explanatory diagram showing the strip layout in the case of a single row of progressive die apparatus according to Embodiment 2 of the present invention.

[0039] Figure 7 This is a cross-sectional view of the progressive die device according to Embodiment 2. Detailed Implementation

[0040] Hereinafter, embodiments of the progressive die apparatus and the method for manufacturing the core sheet of the present invention will be described with reference to the accompanying drawings. Furthermore, for ease of explanation, directions of up / down, front / back, and left / right are defined in each figure using arrows. However, the progressive die of the present invention and the manufacturing method using the progressive die are not necessarily limited to these directions.

[0041] (Implementation Method 1)

[0042] Reference Figures 1-4 Implementation method 1 will be described.

[0043] First, refer to Figure 1 A specific example of the core sheet A used in laminated iron cores will be described. The core sheet A is formed by stamping a strip-shaped sheet (strip) F (see reference 10) using the progressive die device 10 described below. Figure 2 Stamped products are cut into a specified shape. In embodiment 1, adjacent core sheets A are stacked and joined together by riveting.

[0044] The iron core sheet A has an annular yoke B, multiple teeth (magnetic poles) extending radially inward from the yoke B, and multiple riveted parts D formed on the yoke B.

[0045] In the manufacturing process of the core sheet A, under the condition that the strip sheet F is intermittently transferred at a predetermined interval T (hereinafter referred to as the transfer interval T) according to each stamping action of the progressive die device 10, such as Figure 2 As shown, the following steps are performed in sequence: the guide hole punching process (I), which punches to form the guide hole P; the slot punching process (II), which punches to form the slot S between adjacent teeth C; the riveting part forming process (III), which embosses each riveting part D; the inner shape punching process (IV), which punches the circular inner shape G to define the front end of the tooth C; and the outer shape punching process (V), which punches to form the circular outer shape H of the yoke B.

[0046] Next, refer to Figure 3 The progressive die apparatus 10 of Embodiment 1 will be described. The progressive die apparatus 10 has an upper die 20 and a lower die 60, which are configured to clamp a strip-shaped sheet F in the vertical direction.

[0047] The upper die 20 has a plate-shaped upper retainer 22, which is fixed to the lower surface of the upper pressure head (ram, not shown) of the stamping machine. Thus, the upper die 20 can move vertically to approach or separate from the lower die 60. In the upper die 20, a backing plate 24 and a punch plate 26 are mounted at the lower part of the upper retainer 22. The punch plate 26 fixes the guide hole punch 28, the slot punch 30, the riveting punch 32, the inner shape punch 34, and the outer shape punch 36 to the upper retainer 22, respectively. The backing plate 24 prevents the processing forces of each punch 28, 30, 32, 34, and 36 from being directly applied to the upper retainer 22. The support plate 24 is equipped with a measuring control plate cam 38 at a position corresponding to the riveting punch 32, which is movable in the left and right direction. The plate cam 38 increases or decreases the effective length of the riveting punch 32.

[0048] In the upper mold 20, a ejector 40 is mounted below the upper retainer 22. The ejector 40 is capable of relative displacement with respect to the upper retainer 22 in the vertical direction. The ejector 40 is set to its maximum descent position relative to the upper retainer 22 by a suspension support of suspension bolts (not shown). The ejector 40 is configured as a joint of an ejector body 40A and an ejector 40B, both of which are plate-shaped.

[0049] The lower surface of the ejector 40 is opposite to the upper surfaces of the punching die 64 and each punch 68, 70, 72, 74, 76, as described later. Punch through holes 42, 44, 46, 48, 50 are formed on the ejector 40 for each punch 28, 30, 32, 34, 36 to pass through.

[0050] The lower die 60 has a plate-shaped lower retainer 62, which is fixed to the upper surface of the lower bolster (not shown) of the stamping machine. The lower retainer 62 is configured to face the upper retainer 22. In the lower die 60, a plate-shaped punching die 64 is mounted on the upper surface of the lower retainer 62. The punching die 64 is equipped with a guide hole punching die 68, a slot punching die 70, a riveting part forming die 72, an inner shape punching die 74, and an outer shape punching die 76. The outer shape punching die 76 is cylindrical and constitutes a rotating die that rotates and divides around its own central axis at a predetermined rotation angle. The riveting part forming punch 32, the plate cam 38, and the slot punching die 70 constitute the riveting part forming components.

[0051] Each punch 28, 30, 32, 34, 36 corresponds to each die 68, 70, 72, 74, 76, forming separate processing tables that are independent of each other in the transfer direction of the strip sheet F. As processing tables, the punch 28 for hole punching and the die 68 for hole punching constitute the hole punching table (hole forming part) I, the punch 30 for slot punching and the die 70 for slot punching constitute the slot punching table II, the punch 32 for riveting part forming and the die 72 for riveting part forming constitute the riveting part forming table III, the punch 34 for inner shape punching and the die 74 for inner shape punching constitute the inner shape punching table IV, and the punch 36 for outer shape punching and the die 76 for outer shape punching constitute the outer shape punching table V.

[0052] The slot punching table II, the riveting part forming table III, the internal blanking table IV, and the external blanking table V are processing tables that perform predetermined processes in the progressive die device 10. The punches 28, 30, 32, 34, and 36, the dies 68, 70, 72, 74, and 76, and the plate cam 38 provided on each of the tables II to V constitute processing components that perform predetermined processing on the strip sheet F in each of the aforementioned processing tables. Thus, each processing table is equipped with processing components that perform predetermined processing on the strip sheet F.

[0053] In other words, as processing components, the guide hole punching table I has a guide hole punching punch 28 and a guide hole punching die 68, the slot punching table II has a slot punching punch 30 and a slot punching die 70, the riveting part forming table III has a riveting part forming punch 32, a riveting part forming die 72 and a plate cam 38, the inner shape punching table IV has an inner shape punching punch 34 and an inner shape punching die 74, and the outer shape punching table V has an outer shape punching punch 36 and an outer shape punching die 76.

[0054] In addition, in the progressive die device 10, an intermediate idle platform I1 is provided between the inner blanking table IV and the outer blanking table V, and a final idle platform I2 is provided on the forward side (downstream side) of the transfer direction of the outer blanking table V. The strip sheet F is conveyed without load in each idle platform I1 and I2.

[0055] Therefore, in the progressive die apparatus 10, the guide hole punching table I, the slot punching table II, the riveting part forming table III, the inner shape punching table IV, the intermediate idle table I1, the outer shape punching table V, and the final idle table I2 are sequentially arranged at predetermined intervals in the transfer direction of the strip sheet F. The interval between the guide hole punching table I and the slot punching table II is set to 1.5 times the transfer distance T of the strip sheet F, and the interval between their adjacent tables is set to a value equal to the transfer distance T of the strip sheet F.

[0056] In the guide hole punching table I, a plurality of guide hole punching punches 28 and a plurality of guide hole punching dies 68 corresponding to each guide hole punch 28 are used to perform the guide hole punching process. During each punching action, that is, during each intermittent transfer of the strip sheet F, a plurality of circular guide holes P are punched out on the strip sheet F. The guide holes P are arranged along the left and right side edges of the strip sheet F in the transfer direction of the strip sheet F (see reference). Figure 2 ).

[0057] In slot punching table II, the slot punching process is performed using slot punching punch 30 and slot punching die 70. During each punching action, a slot S is punched out on the strip sheet F (see reference). Figure 2 The slots S are arranged at predetermined intervals along the circumference, corresponding to the areas between multiple teeth C formed on the strip-shaped sheet F. The slot punch 30 and the slot punch die 70 are provided corresponding to each slot S.

[0058] In the riveting part forming station III, the riveting part forming process is performed using the riveting part forming punch 32 and the riveting part forming die 72. During each stamping action, the riveting part D is embossed on the strip sheet F (see reference). Figure 2The riveting parts D are arranged at predetermined intervals along the circumference of the yoke B. Each riveting part D is convex on one side of the strip sheet F and concave on the opposite side. In the profile blanking table V described later, the stacked and adjacent iron core sheets A are riveted together.

[0059] The laminated iron core is formed by riveting together a predetermined number of iron core sheets A. During the manufacturing of an additional predetermined number of iron core sheets A using the progressive die apparatus 10, each time a predetermined number of iron core sheets A are manufactured, the plate cam 38 moves in a direction that increases the effective length of the riveting punch 32. That is, when setting the measurement of the number of laminated iron core sheets A, the plate cam 38 moves in a direction that increases the effective length of the riveting punch 32, thereby increasing the effective length of the riveting punch 32 for punching operations.

[0060] In this state, the riveting punch 32 and the riveting die 72 form through holes in the core sheet A instead of embossing. As a result, in the shape stamping table V described later, the stacked core sheets A are not riveted together, and it is possible to continuously manufacture stacked cores obtained by riveting together a specified number of core sheets A.

[0061] In the internal blanking table IV, the internal blanking process is performed using the internal blanking punch 34 and the internal blanking die 74. During each blanking action, a circular internal shape G is formed on the strip sheet F (see reference). Figure 2 Thus, on the strip sheet F, multiple teeth C (including the portion defining the inner edge) are punched out during each stamping action.

[0062] In the shape blanking table V, the shape blanking process is performed using the shape blanking punch 36 and the shape blanking die 76. During each blanking action, a circular shape H is formed on the strip sheet F (see reference). Figure 2 Thus, a thin iron core plate A is punched out from the strip-shaped thin plate F.

[0063] The core sheet A, which is formed by punching out the shape H, is pressed into the punching die 76 by the punching punch 36. The core sheets A that were punched out earlier are stacked sequentially on the core sheet A in the punching die 76. The multiple core sheets A stacked in the punching die 76 are joined together by the riveting part D.

[0064] In the blanking table V, when blanking of the outer shape H begins, as the upper die 20 descends, the stripper 40 descends together with the upper die 20. At this time, the strip sheet F is in a substantially stopped state (including cases where it is not strictly stopped) during non-transfer operations. The descending stripper 40 uses its lower surface to press the upper surface of the strip sheet F downwards. At this time, the strip sheet F is clamped between the lower surface of the stripper 40 and the upper surface of the lower die 60.

[0065] After the blanking of the outer shape H is completed, when the upper die 20 rises, the stripper 40 rises together with the upper die 20. This releases the pressure of the stripper 40 on the strip sheet F, and the strip sheet F separates from the upper surface of the lower die 60. In this state, the strip sheet F is conveyed in the progressive direction by a predetermined amount.

[0066] Furthermore, the operation of this unloader 40 is the same in other IV units.

[0067] In the upper mold 20, as Figure 4 As shown, guide pins 80 are installed at each of the following stages II to V, I1, and I2 after stage I. Each guide pin 80 engages with the corresponding guide hole P in each of stages II to V, I1, and I2 to position the strip-shaped thin plate F in each of stages II to V, I1, and I2.

[0068] like Figure 4 As shown, in each of the I-V, I1, and I2 plates, the guide pin 80 is mounted on the punch plate 26 with the spring force applied downward by the compressed coil spring 82. The guide pin 80 is located near the left and right side edges Fa and Fb of the strip plate F, respectively. In order to correspond with the guide hole P, on the left and right sides of the punch plate 26, the guide pin 80 passes through the pin through hole 84 formed in the unloader 40 and protrudes towards the upper surface of the punch plate 64.

[0069] The guide pin 80 passes through the guide hole P of the strip plate F as the upper die 20 descends, and engages with the guide pin receiving hole 86 formed in the punching die 64. This engagement positions the strip plate F relative to the progressive die assembly 10.

[0070] Next, the formation of multiple guide holes P in the guide hole punching table I and the configuration of guide pins 80 in each of the subsequent tables II to V, I1 and I2 will be explained.

[0071] like Figure 2 As shown, in the guide hole punching table I, there are two guide hole punches 28 and two guide hole punches 68 arranged in the direction of conveying the strip sheet F, corresponding to the left and right side edges Fa and Fb of the strip sheet F.

[0072] Therefore, as Figure 2As shown, during each transfer of the strip plate F, two guide holes P are arranged in the vicinity of each side edge Fa and Fb of the strip plate F along the transfer direction of the strip plate F. Here, for ease of explanation, the guide hole P on the front side (leading side) of the transfer direction is sometimes called the front guide hole Pa, and the guide hole P on the rear side (lagging side) of the transfer direction is called the rear guide hole Pb.

[0073] The front guide hole Pa and the rear guide hole Pb are guide holes formed during each transfer. Front guide holes Pa and rear guide holes Pb in the same row are formed at a predetermined interval smaller than the transfer distance T in the transfer direction of the strip plate F. In each of units II to V, pairs of front guide holes Pa and rear guide holes Pb are respectively provided in front of and behind the aforementioned processing unit's placement position. That is, in each of units II to V, pairs of front guide holes Pa and rear guide holes Pb are formed at two locations in each of units II to V, separated by the aforementioned processing units in the transfer direction of the strip plate F. The pair of front guide holes Pa and rear guide holes Pb in front of the processing unit's placement position is called the front pair, and the pair of front guide holes Pa and rear guide holes Pb behind the processing unit's placement position is called the rear pair.

[0074] In one of stages II to V, guide pin 80 is configured to use the front guide hole Pa of the two guide holes P, and in another stage of stages II to V, guide pin 80 is configured to use the rear guide hole Pb of the two guide holes P. That is, in one stage of stages II to V, guide pin 80 is configured to engage with one of the two guide holes P, and in another stage of stages II to V, guide pin 80 is configured to engage with a guide hole other than the aforementioned one of the two guide holes P. Thus, in at least one stage of stages II to V, at least one guide hole P is not engaged with guide pin 80.

[0075] use Figure 2 The strip layout (taking a single column) is explained with specific examples. Additionally, in Figure 2 In the diagram, the guide hole P that engages with the guide pin 80 is represented by a circle with a cross mark, and the unused guide hole P that does not engage with the guide pin 80 is represented by a hollow circle.

[0076] In the slot punching table II, in both the front and rear pairs, guide pin 80 engages with the rear guide hole Pb, but guide pin 80 does not engage with the front guide hole Pa. That is, the front guide hole Pa is not used.

[0077] From the viewpoint of performing slot punching with high precision, it is preferable that the guide pin 80 engages with the guide hole P formed at the position closest to the processing component, within a range that will not interfere with the processing components (slot punching punch 30 and slot punching die 70). From this viewpoint, in the slot punching table II, it is preferable that the guide pin 80 engages with the rear guide hole Pb at the front centering position and with the front guide hole Pa at the rear centering position.

[0078] In addition, as an exception, it is preferred that the guide hole P, which engages with the guide pin 80 immediately after the guide hole P is formed, is closer to the guide hole punching table I. Therefore, in this embodiment, in the next stage after the guide hole punching table I, namely the slot punching table II, the guide pin 80 engages with the rear guide hole Pb, which is closer to the guide hole punching table I than the front guide hole Pa.

[0079] In the riveting section forming platform III, the guide pin 80 engages with the guide hole located away from the plate cam 38. That is, when aligned at the front, the guide pin 80 engages with the front guide hole Pa, and when aligned at the rear, the guide pin 80 engages with the rear guide hole Pb, so that the guide pin 80 will not interfere with the plate cam 38 (processing component).

[0080] In the internal blanking table IV, the guide pin 80 engages with the guide hole located near the processing components (internal blanking punch 34 and internal blanking die 74). Specifically, in front centering, the guide pin 80 engages with the rear guide hole Pb, and in rear centering, the guide pin 80 engages with the front guide hole Pa, enabling high-precision internal blanking.

[0081] In the shape blanking table V, the guide pin 80 engages with the guide hole located away from the shape blanking die 76. That is, in front centering, the guide pin 80 engages with the front guide hole Pa, and in rear centering, the guide pin 80 engages with the rear guide hole Pb, so that the guide pin 80 will not interfere with the shape blanking die 76 (processing part) which is a rotating die.

[0082] Furthermore, in the intermediate idle stage I1, the guide pin 80 engages with the rear guide hole Pb in either the front or rear pair. Also, in the front pair of the final idle stage I2, the guide pin 80 engages with the rear guide hole Pb, and in the rear pair of the final idle stage I2, the guide pin 80 engages with the front guide hole Pa.

[0083] In each unit, the guide pin 80 is configured to engage with the aforementioned front guide hole Pa or rear guide hole Pb. As a result, the degree of freedom of the position of the guide hole P that engages with the guide pin 80 increases with respect to the conveying direction of the strip plate F. Consequently, the degree of freedom of the position of the guide pin 80 also increases with respect to the conveying direction of the strip plate F.

[0084] Therefore, the guide pin 80 can be easily positioned so as not to interfere with the plate cam 38 and the profile punching die 76, which is a rotary die.

[0085] In other words, even if one of the front guide hole Pa and the rear guide hole Pb is formed at a position that would interfere with a processing component of a processing station such as the plate cam 38 or the shape blanking die 76, the guide pin 80 can engage with the other front guide hole Pa or the rear guide hole Pb located at the position where interference would occur, and the guide pin 80 can engage with the other front guide hole Pa or the rear guide hole Pb formed at the position where interference would not occur. Thus, the guide hole P can function in each processing station without complicating the construction of the plate cam 38 and the shape blanking die 76.

[0086] Thus, high-precision core sheet A can be repeatedly manufactured under the proper positioning of the strip sheet F relative to the progressive die device 10 based on the engagement of the guide hole P and the guide pin 80.

[0087] Figure 5 The diagram illustrates the strip layout when using a double row. When using a double row, Figure 2 The multiple processing stations shown are configured in a left-right double row. In each station in the left and right rows, the front guide hole Pa or the rear guide hole Pb used in the guide hole located on the left side edge Fa of the strip plate F and the right side edge Fb is offset in the transfer direction. Additionally, in... Figure 5 Similarly, guide holes that are used in conjunction with guide pin 80 are indicated by circles with cross markings, while unused guide holes that are not used in conjunction with guide pin 80 are indicated by hollow circles.

[0088] Therefore, in the case of a double row, just as in the case of a single row, in each unit, the guide pin 80 is configured to engage with the aforementioned front guide hole Pa or rear guide hole Pb.

[0089] Therefore, even in the case of a double row, the degree of freedom in the configuration of the guide hole P that engages with the guide pin 80 increases with respect to the conveying direction of the strip plate F.

[0090] (Implementation Method 2)

[0091] Reference Figure 6 and Figure 7 Embodiment 2 will be described. Furthermore, in Embodiment 2, parts that are substantially the same as those in Embodiment 1 will be described using the same reference numerals as those in Embodiment 1.

[0092] In Embodiment 2, the stacked iron core plates A are joined together by adhesive bonding. The iron core plate A used in Embodiment 2 does not have the riveting portion D of Embodiment 1; the portion corresponding to the riveting portion D becomes the bonding point J (see [reference]). Figure 6In the core sheet A of Embodiment 2, the riveting part D and the bonding point J are different from those of Embodiment 1, but the other structures are the same. Figure 1 The core plate A shown in Embodiment 1 is the same, so for convenience, it is described using the same reference numerals as the core plate A in Embodiment 1.

[0093] In the manufacturing process of the core sheet A, when the strip sheet F is intermittently transferred at a predetermined interval T (hereinafter referred to as the transfer interval T) during each stamping action of the progressive die device 10, such as Figure 6 As shown, the following steps are performed sequentially: a guide hole punching process (I) to punch and form a guide hole P; a slot punching process (II) to punch and form a slot S between adjacent teeth C; an inner shape punching process (III) to punch and form a circular inner shape G to define the front end of the teeth C; an adhesive coating process (IV) to apply adhesive to each bonding point J of the strip sheet F (yoke B); and an outer shape punching process (V) to punch and form a circular outer shape H of the yoke B.

[0094] Furthermore, in this embodiment, since the adhesive coating apparatus 90 (described later) is positioned below the strip-shaped sheet F, each adhesive point J is located on the lower surface of the strip-shaped sheet F. Therefore, each adhesive point J is located on... Figure 6 In the top view, it should be indicated by a hidden line (dashed line), but for ease of understanding, the location where the adhesive was applied is indicated by black.

[0095] Next, refer to Figure 7 The progressive die apparatus 10 of Embodiment 2 will be described. The progressive die apparatus 10 has an upper die 20 and a lower die 60 configured to clamp a strip-shaped thin plate F from above and below.

[0096] The upper die 20 has a plate-shaped upper retainer 22, which is fixed to the upper pressure head (not shown) of the stamping machine. Thus, the upper die 20 can move vertically to approach or separate from the lower die 60. In the upper die 20, a support plate 24 and a punch plate 26 are mounted at the lower part of the upper retainer 22. The punch plate 26 fixes the guide hole punch 28, the slot punch 30, the inner shape punch 34, and the outer shape punch 36 to the upper retainer 22 respectively.

[0097] In the upper mold 20, a ejector 40 is mounted below the upper retainer 22. The ejector 40 is capable of relative displacement with respect to the upper retainer 22 in the vertical direction. The ejector 40 is set to its maximum descent position relative to the upper retainer 22 by a suspension support of suspension bolts (not shown). The ejector 40 is configured as a joint of an ejector body 40A and an ejector 40B, both of which are plate-shaped.

[0098] The lower surface of the ejector 40 is opposite to the upper surfaces of the punching die 64 and each punch 68, 70, 74, 76, as described later. Punch through holes 42, 44, 48, 50 are formed on the ejector 40 for each punch 28, 30, 34, 36 to pass through.

[0099] The lower die 60 has a plate-shaped lower retainer 62, which is fixed to the upper surface of the lower pad (not shown) of the stamping machine. The lower retainer 62 is configured to face the upper retainer 22. In the lower die 60, a plate-shaped punching die 64 is mounted on the upper surface of the lower retainer 62. The punching die 64 is equipped with a guide hole punching die 68, a slot punching die 70, an inner shape punching die 74, an adhesive application device 90, and an outer shape punching die 76. The outer shape punching die 76 is cylindrical and constitutes a rotating die that rotates and divides around its own central axis at a predetermined rotation angle.

[0100] Each punch 28, 30, 34, 36 corresponds to each die 68, 70, 74, 76, forming separate processing tables that are independent of each other in the transfer direction of the strip sheet F. As processing tables, the hole punch 28 and the hole punch 68 constitute a hole punching table (hole forming section) I; the slot punch 30 and the slot punch 70 constitute a slot punching table II; the inner shape punch 34 and the inner shape punch 74 constitute an inner shape punching table III; and the outer shape punch 36 and the outer shape punch 76 constitute an outer shape punching table V. Between the inner shape punching table III and the outer shape punching table V, an adhesive coating device 90 constitutes an adhesive coating table IV.

[0101] The slot punching table II, the internal blanking table IV, the adhesive coating table IV, and the external blanking table V are processing tables that perform predetermined processes in the progressive die apparatus 10. The punches 28, 30, 34, and 36, the dies 68, 70, 74, and 76, and the adhesive coating device 90, provided on each of the tables II to V, constitute processing components that perform predetermined processing on the strip sheet F in each of the aforementioned processing tables. Thus, each processing table is equipped with processing components that perform predetermined processing on the strip sheet F.

[0102] In other words, as processing components, the guide hole punching table I has a guide hole punching punch 28 and a guide hole punching die 68, the slot punching table II has a slot punching punch 30 and a slot punching die 70, the inner shape punching table III has an inner shape punching punch 34 and an inner shape punching die 74, the adhesive coating table IV has an adhesive coating device 90, and the outer shape punching table V has an outer shape punching punch 36 and an outer shape punching die 76.

[0103] In addition, in the progressive die apparatus 10, an intermediate idle stage I1 is provided between the adhesive coating stage IV and the shape blanking stage V, and a final idle stage I2 is provided on the forward side (downstream side) of the conveying direction of the shape blanking stage V. The strip sheet F is conveyed without load in each idle stage I1 and I2.

[0104] Therefore, in the progressive die device 10, the guide hole punching table I, the slot punching table II, the inner shape punching table III, the adhesive coating table IV, the intermediate idle table I1, the outer shape punching table V, and the final idle table I2 are sequentially arranged at predetermined intervals in the conveying direction of the strip sheet F. The interval between the guide hole punching table I and the slot punching table II is set to 1.5 times the conveying distance T of the strip sheet F, and the interval between their adjacent tables is set to a value equal to the conveying distance T of the strip sheet F.

[0105] In the guide hole punching table I, a plurality of guide hole punching punches 28 and a plurality of guide hole punching dies 68 corresponding to each guide hole punch 28 are used to perform the guide hole punching process. During each punching action, that is, during each intermittent transfer of the strip sheet F, a plurality of circular guide holes P are punched out on the strip sheet F. The guide holes P are arranged along the left and right side edges of the strip sheet F in the transfer direction of the strip sheet F (see reference). Figure 6 ).

[0106] In slot punching table II, the slot punching process is performed using slot punching punch 30 and slot punching die 70. During each punching action, a slot S is punched out on the strip sheet F (see reference). Figure 6 The slots S are arranged at predetermined intervals along the circumference, corresponding to the areas between multiple teeth C formed on the strip-shaped sheet F. The slot punch 30 and the slot punch die 70 are provided corresponding to each slot S.

[0107] In the internal blanking table III, the internal blanking process is performed using the internal blanking punch 34 and the internal blanking die 74. During each blanking action, a circular internal shape G is formed on the strip sheet F (see reference). Figure 6 Thus, on the strip sheet F, multiple teeth C (including the portion defining the inner edge) are punched out during each stamping action.

[0108] In the adhesive coating station IV, adhesive coating is performed using the adhesive coating device 90.

[0109] The adhesive application apparatus 90 has an upper block 92 and a lower block 94 integrally joined together. The upper block 92 and the lower block 94 cooperate to define an adhesive storage chamber 96. Liquid adhesive pressurized to a predetermined pressure is supplied to the adhesive storage chamber 96 from an adhesive passage 98 formed in the lower block 94. A plurality of adhesive ejection ports 100 communicating with the adhesive storage chamber 96 are formed through the upper wall of the upper block 92. Each of the plurality of adhesive ejection ports 100 opens on the flat upper surface of the upper block 92. The adhesive supplied to the adhesive storage chamber 96 has a predetermined viscosity, thereby forming a generally hemispherical bulge K at each adhesive ejection port 100, which bulges upward from the opening end relative to the upper surface of the upper block 92.

[0110] The assembly of the upper block 92 and the lower block 94 engages with the block receiving hole 102 formed on the lower retainer 62 and the punching die 64 in a manner that allows it to slide vertically. On the lower side of the lower retainer 62, a block receiving hole 102 is formed that allows it to slide vertically. Figure 7 A plate cam 106 is provided for left-right movement during observation. This plate cam 106 includes a serrated cam portion 104. A serrated cam portion 108 corresponding to the cam portion 104 is formed on the lower surface of the lower block 94. Figure 7 As shown, the assembly of the upper block 92 and the lower block 94 moves between a position where the upper surface of the upper block 92 is approximately coplanar with the upper surface of the punching die 64, or between a rising position slightly below the upper surface of the punching die 64 and a falling position slightly below the rising position, by the movement of the plate cam 106.

[0111] The assembly of upper block 92 and lower block 94 is in the rising position except when the number of sheets of core plate A being stacked is being measured. In this rising position, as the strip plate F descends toward the upper surface of the punching die 64 via the descent of the unloader 40, the adhesive of the raised portion K contacts and transfers to the lower surface of the strip plate F. In this way, adhesive is applied to each bonding point J of the strip plate F. When the number of sheets of core plate A being stacked is being measured, the assembly of upper block 92 and lower block 94 is in the falling position. Therefore, even when the strip plate F descends toward the upper surface of the punching die 64, the adhesive of the raised portion K does not contact the lower surface of the strip plate F, and the adhesive is not applied to the strip plate F.

[0112] In the shape blanking table V, the shape blanking process is performed using the shape blanking punch 36 and the shape blanking die 76. During each blanking action, a circular shape H is formed on the strip sheet F (see reference). Figure 2 Thus, a thin iron core plate A is punched out from the strip-shaped thin plate F.

[0113] The core sheet A, which is cut by the shape H, is pressed into the shape cutting die 76 by the shape cutting punch 36, and is stacked on the core sheet A that was cut out earlier in the shape cutting die 76. The multiple core sheets A stacked in the shape cutting die 76 are bonded (joined) to each other by the adhesive at each bonding point J.

[0114] In the blanking table V, when blanking of the outer shape H begins, as the upper die 20 descends, the stripper 40 descends together with the upper die 20. At this time, the strip sheet F is in a substantially stopped state (including cases where it is not strictly stopped) during non-transfer operations. The descending stripper 40 uses its lower surface to press the upper surface of the strip sheet F downwards. At this time, the strip sheet F is clamped between the lower surface of the stripper 40 and the upper surface of the lower die 60.

[0115] After the blanking of the outer shape H is completed, when the upper die 20 rises, the stripper 40 rises together with the upper die 20. This releases the pressure of the stripper 40 on the strip sheet F, and the strip sheet F separates from the upper surface of the lower die 60. In this state, the strip sheet F has been conveyed in the progressive direction by a predetermined amount.

[0116] Furthermore, the operation of this unloader 40 is the same in other IV units.

[0117] In the upper mold 20, as Figure 4 As shown, guide pins 80 are installed at each of the following stages II to V, I1, and I2 after stage I. Each guide pin 80 engages with the corresponding guide hole P in each of stages II to V, I1, and I2 to position the strip-shaped thin plate F in each of stages II to V, I1, and I2.

[0118] In implementation method 2, the same applies as in implementation method 1, such as... Figure 4 As shown, in each of the I-V, I1, and I2 plates, the guide pin 80 is mounted on the punch plate 26 with the spring force applied downward by the compressed coil spring 82. The guide pin 80 is located near the left and right side edges Fa and Fb of the strip plate F, respectively. In order to correspond with the guide hole P, on the left and right sides of the punch plate 26, the guide pin 80 passes through the pin through hole 84 formed in the unloader 40 and protrudes towards the upper surface of the punch plate 64.

[0119] The guide pin 80 passes through the guide hole P of the strip plate F as the upper die 20 descends, and engages with the guide pin receiving hole 86 formed in the punching die 64. This engagement positions the strip plate F relative to the progressive die assembly 10.

[0120] Next, the formation of multiple guide holes P in the guide hole punching table I and the configuration of guide pins 80 in each of the subsequent tables II to V, I1 and I2 will be explained.

[0121] like Figure 6 As shown, the guide hole punching punch 28 and guide hole punching die 68 of the guide hole punching table I are arranged in two positions corresponding to the left and right side edges Fa and Fb of the strip sheet F, respectively, along the conveying direction of the strip sheet F.

[0122] Therefore, as Figure 6 As shown, during each transfer of the strip plate F, two guide holes P are arranged and formed near each side edge Fa and Fb of the strip plate F along the transfer direction of the strip plate F. Here, also in Embodiment 2, for ease of explanation, the guide hole P on the front side (advancing side) of the transfer direction is sometimes called the front guide hole Pa, and the guide hole P on the rear side (lagging side) of the transfer direction is called the rear guide hole Pb.

[0123] The front guide hole Pa and the rear guide hole Pb are guide holes formed during each transfer. The front guide holes Pa and the rear guide holes Pb in the same row are formed at a predetermined interval smaller than the transfer distance T in the transfer direction of the strip plate F. In each of units II to V, the pairs of front guide holes Pa and rear guide holes Pb are respectively provided in front of and behind the aforementioned processing unit's placement position in each of units II to V. That is, in each of units II to V, the pairs of front guide holes Pa and rear guide holes Pb are formed at two locations, separated by the aforementioned processing units of each of units II to V, in the transfer direction of the strip plate F. In Embodiment 2, the pair of front guide holes Pa and rear guide holes Pb in front of the processing unit's placement position is called the front pair, and the pair of front guide holes Pa and rear guide holes Pb behind the processing unit's placement position is called the rear pair.

[0124] In one of stages II to V, guide pin 80 is configured to use the front guide hole Pa of the two guide holes P, and in another stage of stages II to V, guide pin 80 is configured to use the rear guide hole Pb of the two guide holes P. That is, in one stage of stages II to V, guide pin 80 is configured to engage with one of the two guide holes P, and in another stage of stages II to V, guide pin 80 is configured to engage with a guide hole other than the aforementioned one of the two guide holes P. Thus, in at least one stage of stages II to V, at least one guide hole P is not engaged with guide pin 80.

[0125] use Figure 6 The strip layout (taking a single column) is explained with specific examples. Additionally, in Figure 6 In the diagram, the guide hole P that engages with the guide pin 80 is represented by a circle with a cross mark, while the unused guide hole P that does not engage with the guide pin 80 is represented by a hollow circle.

[0126] In the slot punching table II, in both the front and rear pairs, guide pin 80 engages with the rear guide hole Pb, but guide pin 80 does not engage with the front guide hole Pa. That is, the front guide hole Pa is not used.

[0127] In the inner blanking table III, the guide pin 80 engages with the guide hole located near the processing components (inner blanking punch 34 and inner blanking die 74). That is, in front centering, the guide pin 80 engages with the rear guide hole Pb, and in rear centering, the guide pin 80 engages with the front guide hole Pa, enabling high-precision inner blanking.

[0128] Furthermore, the front pair of the slot punching table II, located between the slot punching table II and the inner punching table III, forms the rear pair in the inner punching table III. In the front pair of the slot punching table II, in other words, in the rear pair of the inner punching table III, the guide pin 80 engages with both the front guide hole Pa and the rear guide hole Pb.

[0129] In the adhesive coating station IV, the guide pin 80 engages with the guide hole located away from the adhesive coating device 90. That is, in front centering, the guide pin 80 engages with the front guide hole Pa, and in rear centering, the guide pin 80 engages with the rear guide hole Pb, so that the guide pin 80 does not interfere with the adhesive coating device 90 (processing unit).

[0130] In the shape blanking table V, the guide pin 80 engages with the guide hole located away from the shape blanking die 76. That is, in front centering, the guide pin 80 engages with the front guide hole Pa, and in rear centering, the guide pin 80 engages with the rear guide hole Pb, so that the guide pin 80 does not interfere with the shape blanking die 76 (processing part) which is a rotating die.

[0131] In the intermediate idle stage I1 and the final idle stage I2, in order to suppress the vibration of the strip plate F caused by processing impact, the guide pin 80 engages with the guide hole on the side of the front pair and the rear pair that shortens the separation distance of the strip plate F in the conveying direction. That is, in the front pair, the guide pin 80 engages with the rear guide hole Pb, and in the rear pair, the guide pin 80 engages with the front guide hole Pa.

[0132] In each unit, the guide pin 80 is configured to engage with the aforementioned front guide hole Pa or rear guide hole Pb. This increases the degree of freedom in the placement of the guide hole P engaging with the guide pin 80 with respect to the conveying direction of the strip plate F. Consequently, the degree of freedom in the placement of the guide pin 80 also increases with respect to the conveying direction of the strip plate F.

[0133] Therefore, the guide pin 80 can be easily positioned so as not to interfere with the adhesive coating device 90 and the shape-cutting die 76, which is a rotary die.

[0134] In other words, even if one of the front guide hole Pa and the rear guide hole Pb is formed at a position that would interfere with the processing components of a certain processing station, such as the adhesive application device 90 or the shape-cutting die 76, the guide pin 80 can not engage with the front guide hole Pa or the rear guide hole Pb located at the position where interference would occur, and the guide pin 80 can engage with the other front guide hole Pa or the rear guide hole Pb formed at the position where interference would not occur. Thus, the guide hole P can function in each processing station without complicating the construction of the plate cam 38 and the shape-cutting die 76.

[0135] Therefore, in Embodiment 2, similarly to Embodiment 1, a high-precision core sheet A can be repeatedly manufactured under the appropriate positioning of the strip sheet F relative to the progressive die device 10 based on the engagement of the guide hole P and the guide pin 80.

[0136] In addition, in Embodiment 2, the double column method can be applied in the same way as in Embodiment 1.

[0137] The preferred embodiments of the present invention have been described above. However, those skilled in the art will readily understand that the present invention is not limited to these embodiments and can be appropriately modified without departing from the spirit of the invention. For example, the front guide hole Pa and the rear guide hole Pb on the same side can also be offset from each other in the transverse width direction of the strip sheet F. The number of guide holes P formed by punching in each column during each transfer of the intermittently transferred strip sheet F is not limited to 2, and can be more than 3 as long as it is within the range of 1 transfer interval T.

[0138] The guide pin 80 and the guide hole P are not limited to the vicinity of the left and right side edges of the strip plate F, but can also be located between the left and right side edges in a position that will not interfere with the processing components. In each processing station, the guide hole P that engages with the guide pin 80 can also be located on the left side edge Fa side and the right side edge Fb side of the strip plate F. For example, a rear guide hole Pb can be used on the side edge Fa side, and a front guide hole Pa can be used on the side edge Fb side.

[0139] Label Explanation

[0140] 10: Progressive die assembly; 20: Upper die; 22: Upper retainer; 24: Support plate; 26: Punch plate; 28: Punch for guide hole punching; 30: Punch for slot punching; 32: Punch for riveting part forming; 34: Punch for internal shape punching; 36: Punch for external shape punching; 38: Plate cam; 40: Ejector; 40A: Ejector body; 40B: Ejector; 42: Punch through hole; 44: Punch through hole; 46: Punch through hole; 48: Punch through hole 50: Through hole; 60: Lower die; 62: Lower retainer; 64: Punch template; 68: Die for punching guide holes; 70: Die for punching slots; 72: Die for forming riveted parts; 74: Die for punching internal shapes; 76: Die for punching external shapes; 80: Guide pin; 82: Compression coil spring; 84: Through hole for pins; 86: Guide pin receiving hole; 90: Adhesive coating device; 92: Upper block; 94: Lower block; 96: Adhesive storage chamber; 98: Adhesive... 100: Adhesive outlet port; 102: Block receiving hole; 104: Cam portion; 106: Plate cam; 108: Cam portion; A: Iron core sheet; B: Yoke portion; C: Tooth portion; D: Riveting portion; F: Strip sheet; Fa: Side edge; Fb: Side edge; G: Inner shape; H: Outer shape; I: Guide hole punching table (Embodiment 1, Embodiment 2); II: Slot punching table (Embodiment 1, Embodiment 2); III: Riveting portion forming table (Embodiment 1) III: Inner blanking table (Embodiment 2); IV: Inner blanking table (Embodiment 1); IV: Adhesive coating table (Embodiment 2); V: Outer blanking table (Embodiment 1, Embodiment 2); I1: Intermediate idle table (Embodiment 1, Embodiment 2); I2: Final idle table (Embodiment 1, Embodiment 2); J: Adhesive point; K: Raised portion; P: Guide hole; Pa: Front guide hole; Pb: Rear guide hole; S: Groove; T: Transfer spacing.

Claims

1. A progressive die apparatus, comprising performing a predetermined process on a strip of sheet material intermittently conveyed at predetermined intervals in each of a plurality of processing stations to produce a core sheet of a predetermined shape, wherein the plurality of processing stations are arranged in the conveying direction of the strip of sheet material, wherein, The progressive die device has: A guide hole forming section punches out multiple guide holes during each transfer of the intermittently transferred strip sheet; as well as At least one guide pin is provided corresponding to each processing station of the processing table, and engages with the corresponding guide hole to position the strip plate in each processing station. In one of the processing stages of the processing station, the guide pin is configured to engage with one of the plurality of guide holes. In another processing station of the processing station, the guide pin is configured to engage with a guide hole other than the one of the plurality of guide holes.

2. The progressive die apparatus according to claim 1, wherein, The guide hole forming part is configured such that the plurality of guide holes are arranged in the transfer direction.

3. The progressive die apparatus according to claim 1, wherein, The guide hole forming part is configured such that the plurality of guide holes are arranged along the respective side edges of the two sides of the strip in the conveying direction.

4. The progressive die apparatus according to any one of claims 1 to 3, wherein, Each processing station of the processing station is equipped with a processing unit that performs a specified processing on the strip-shaped sheet. The guide pin engages with the guide hole in each of the processing stations of the processing station, which is formed at multiple locations in the transfer direction across the processing component and will not interfere with the processing component.

5. The progressive die apparatus according to claim 4, wherein, As one of the processing stations, there is a riveting part forming station, which has a riveting part forming punch and a riveting part forming die for forming a riveting part on the strip-shaped thin plate, and a cam for increasing or decreasing the effective length of the riveting part forming punch. The processing component that interferes with the guide pin is the cam.

6. The progressive die apparatus according to claim 4, wherein, As one of the processing stations, there is an adhesive coating station, which has an adhesive coating device for coating adhesive onto the strip sheet, and the processing component that interferes with the guide pin is the adhesive coating device.

7. The progressive die apparatus according to claim 4, wherein, As one of the processing tables, there is a blanking table having a punch and a rotary die, and the processing component that interferes with the guide pin is the rotary die.

8. A method for manufacturing a thin iron core sheet, comprising using a progressive die device to perform a predetermined process on a strip of thin sheet intermittently conveyed at predetermined intervals in each of a plurality of processing tables to manufacture a thin iron core sheet of a predetermined shape, wherein the plurality of processing tables are arranged in the conveying direction of the strip of thin sheet, wherein, The manufacturing method of the iron core sheet includes the following: During each transfer of the intermittently transferred strip, multiple guide holes are punched out using the guide hole forming part; At least one guide pin, corresponding to each processing station of the processing station, engages with the corresponding guide hole to position the strip-shaped plate in each processing station; and The guide pin engages with one of the plurality of guide holes in one of the processing stages of the processing station, and engages with other guide holes in the plurality of guide holes in another processing stage of the processing station.

9. The method for manufacturing a thin iron core plate according to claim 8, wherein, The plurality of guide holes are arranged in the conveying direction.

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