Adhesive applying device and steel plate bonding method

Abstract

To provide an adhesive application device capable of adjusting an application amount according to characteristics of an adhesive to be used, and a steel plate bonding method.SOLUTION: An adhesive application device 40 is a device which is provided on at least one of an upper mold 2 and a lower mold 3, and applies an adhesive 41 to a steel plate material 30. The adhesive application device 40 includes: a nozzle unit 42 for applying the adhesive 41 to the steel plate material 30; an adhesive storage part for storing the adhesive 41; and a supply pipe 44 for supplying the adhesive 41 to the nozzle unit 42 from the adhesive storage part. The adhesive application device 40 further includes: a nozzle tip 45 formed in the nozzle unit 42 to apply the adhesive 41 to the steel plate material 30; and a nozzle gap adjustment device capable of adjusting a gap ag between the nozzle tip 45 and the steel plate material 30 when the nozzle tip 45 is brought into closest contact with the steel plate material 30.SELECTED DRAWING: Figure 22

Description

[Technical Field]

[0001] The present invention relates to an adhesive applying device to be mounted on a laminated steel sheet manufacturing apparatus, and a steel sheet bonding method for bonding and laminating steel sheets. [Background technology]

[0002] Various adhesive applicators have been proposed for manufacturing laminated steel sheets that constitute armatures for rotating electrical machines. For example, Patent Document 1 outlines the following: A laminated steel sheet manufacturing apparatus includes a progressive die device that uses upper and lower dies to punch steel sheets from an intermittently transported hoop material. The apparatus also includes an adhesive applicator located within the lower die that applies adhesive to corresponding portions of the underside of the hoop material. The adhesive applicator includes an adhesive discharge section having a discharge hole that discharges adhesive toward the adhesive application surface, and an adhesive supply section that constantly supplies adhesive to the adhesive discharge section at a predetermined pressure. The adhesive applicator is configured to transfer adhesive to the hoop material when the upper die is lowered and the stripper plate contacts the hoop material against the upper surface of the lower die. Furthermore, the document describes that the tip of the discharge hole can be configured to be spaced apart from the strip-shaped thin steel sheet when the upper die is lowered and the stripper plate contacts the strip-shaped thin steel sheet against the upper surface of the lower die.

[0003] According to this, the adhesive application device has an adhesive supply section that constantly supplies adhesive at a predetermined pressure, and transfers the adhesive to the hoop material when the upper mold descends, so that laminated steel plates can be manufactured in which steel plates are bonded together with adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-124828 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional adhesive applicators, adhesive is constantly supplied at a predetermined pressure from the adhesive discharge section. The adhesive is applied when the adhesive applicator comes into contact with the hoop material or steel plate. This means that the adhesive is applied when the upper die descends and contacts the hoop material or steel plate, making it difficult to control the timing of adhesive application. In particular, when the upper die descends and the stripper plate abuts the steel strip against the upper surface of the lower die, the gap between the tip of the discharge hole and the steel strip is constant and cannot be adjusted. This means that it is difficult to adjust the amount of adhesive applied.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive applicator that can adjust the amount of adhesive applied depending on the characteristics of the adhesive being used.

[0007] SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive applicator that can adjust the amount of adhesive applied depending on the characteristics of the adhesive being used. [Means for solving the problem]

[0008] The adhesive applicator according to a first aspect of the present invention is an adhesive applicator incorporated into a manufacturing apparatus that manufactures laminated steel plates by stacking steel plates that are punched into a predetermined shape from a steel plate material, and that includes a nozzle unit that is provided on at least one of the upper and lower dies and applies adhesive to the steel plate material, an adhesive reservoir that stores the adhesive, a supply pipe that supplies the adhesive from the adhesive reservoir to the nozzle unit, a nozzle tip that is formed on the nozzle unit and applies the adhesive to the steel plate material, and a nozzle spacing adjustment device that adjusts the distance between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material.

[0009] In this case, the adhesive applicator is equipped with a nozzle gap adjustment device, which makes it possible to adjust the gap when the nozzle tip is closest to the steel plate material, thereby preventing the nozzle tip from coming into contact with the steel plate material and damaging it, and enabling an appropriate amount of adhesive to be applied to the steel plate material.

[0010] The nozzle interval adjustment device of the adhesive applicator may include an interval adjustment cam and an interval adjustment block that is contactable with the interval adjustment cam and that is movable by the interval adjustment cam in the movement direction of the nozzle unit.

[0011] In this case, the nozzle gap adjustment device of the adhesive applicator can adjust the gap between the nozzle unit and the steel plate material by operating the gap adjustment cam to move the gap adjustment block.

[0012] Further, the adhesive application device may include a nozzle switching device that is arranged between the nozzle spacing adjustment device and the nozzle unit and that can switch between a state in which the nozzle unit applies the adhesive to the steel plate material and a state in which it does not apply the adhesive, and the nozzle switching device may include a switching operating cam, a switching passive cam, and a holding member, and the switching operating cam may move in a direction perpendicular to the direction in which the nozzle unit moves in association with the movement of the upper mold, and the switching passive cam may move along the direction in which the nozzle unit moves in association with the movement of the upper mold by operation of the switching operating cam, and the holding member may hold the switching operating cam and / or the switching passive cam in the direction in which the nozzle unit moves in association with the movement of the upper mold.

[0013] In this case, the adhesive applicator can use the nozzle switching device to switch between a state in which the nozzle unit applies adhesive and a state in which it does not. Also, the holding member holds the switching actuating cam and / or the switching passive cam in the direction in which the nozzle unit moves in conjunction with the movement of the upper mold, so that the switching actuating cam moves smoothly relative to the switching passive cam.

[0014] In addition, the adhesive application device may be provided with a killer pin that comes into direct or indirect contact with the nozzle unit and applies a pressing force by elastic force so that the nozzle unit moves in a direction away from the steel plate material, and the nozzle unit may be maintained in a state of direct or indirect contact with the nozzle spacing adjustment device.

[0015] In this case, the nozzle unit of the adhesive applicator is maintained in direct or indirect contact with the nozzle gap adjustment device by the killer pin, so that the gap between the nozzle unit and the steel plate material can be maintained stable even when operating at high speed.

[0016] In addition, the adhesive application device may be provided on the upper mold and the lower mold, sandwiching the steel plate material therebetween, and when the upper mold and the lower mold move in a direction toward each other, the adhesive may be applied to a first surface of the steel plate material and a second surface which is the back side of the first surface.

[0017] In this case, the adhesive applying device is provided on the upper and lower dies, sandwiching the steel sheet material therebetween, so that the time required for applying adhesive can be shortened.

[0018] The adhesive may be composed of two types of liquid agents, a main agent and a secondary agent, and the adhesive of one of the upper mold and the lower mold may be the main agent, and the adhesive of the other may be the secondary agent.

[0019] In this case, the adhesive of one of the upper and lower dies is a main agent, and the adhesive of the other is a secondary agent, so that when the steel sheets are stacked, the main agent and the secondary agent come into contact and undergo a curing reaction to bond them together. Therefore, the adhesive applicator can prevent the adhesive from drying or curing before the steel sheets are stacked, thereby reducing its adhesive ability.

[0020] A first steel plate bonding method according to a second aspect of the present invention is a method for stacking and bonding steel plates using the adhesive application device, and includes a first step of adjusting the distance between the nozzle tip and the steel plate material when it is closest to the steel plate material using the nozzle spacing adjustment device, a second step of applying the adhesive to the steel plate material after the first step, and a third step of stacking and bonding the punched steel plates after the second step.

[0021] This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel sheet material and the second distance between the nozzle tip and the second surface, thereby allowing the steel sheets to be laminated and bonded together with appropriate amounts of adhesive applied to each of the first surface and the second surface.

[0022] A second laminate bonding method according to a second aspect of the present invention is a method for laminate bonding steel plates using the adhesive application device, and includes a first step of adjusting a first distance between the nozzle tip and the steel plate material when the nozzle tip is closest to the first surface of the steel plate material, using the nozzle spacing adjustment device provided in the upper mold; a second step of adjusting a second distance between the nozzle tip and the steel plate material when the nozzle tip is closest to the second surface of the steel plate material, using the nozzle spacing adjustment device provided in the lower mold; a third step of applying the adhesive to the steel plate material after the first step and the second step; and a fourth step of laminate bonding the steel plates whose outlines have been punched out, after the third step.

[0023] This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel sheet material, and the second distance between the nozzle tip and the second surface. Therefore, the adhesives are applied after adjusting the first distance suitable for the main agent to be applied to the first surface and the second distance suitable for the secondary agent to be applied to the second surface, so that the steel sheets can be laminated and bonded by applying an appropriate amount of the main agent to the first surface and an appropriate amount of the secondary agent to the second surface.

[0024] A third laminate bonding method according to the second aspect of the present invention is a method of laminate bonding the steel plates using the adhesive applicator, and includes a first step of adjusting a first distance between the nozzle tip and the steel plate material when it is closest to the first surface of the steel plate material, using the nozzle spacing adjustment device provided on the upper mold; a second step of adjusting a second distance between the nozzle tip and the steel plate material when it is closest to the second surface of the steel plate material, using the nozzle spacing adjustment device provided on the lower mold; a third step of applying the main agent to the first surface, using the adhesive applicator; a fourth step of applying the secondary agent to the second surface at a position corresponding to where the main agent has been applied; and a fifth step of laminate bonding the steel plates whose outlines have been punched out, after the fourth step.

[0025] This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel sheet material, and the second distance between the nozzle tip and the second surface. Therefore, the adhesives are applied after adjusting the first distance suitable for the main agent to be applied to the first surface and the second distance suitable for the secondary agent to be applied to the second surface, so that the steel sheets can be laminated and bonded by applying an appropriate amount of the main agent to the first surface and an appropriate amount of the secondary agent to the second surface. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a plan view showing a mold 4 of the present invention. [Figure 2] 2 is a cross-sectional view of a first station P1, showing a cross section II in FIG. 1. FIG. [Figure 3] 3 is a detailed view of part A in FIG. 2, and is a cross-sectional view showing the first rotary drive unit 7. FIG. [Figure 4] 4A and 4B are detailed views of part D in FIG. 3, in which (a) shows the state in which the first punch driving unit 8 and the first die driving unit 9 are rotating when the upper mold 2 is at the top dead center, and (b) shows the state in which the upper mold 2 is at the bottom dead center and the rotation of the first punch driving unit 8 and the first die driving unit 9 has stopped. [Figure 5] FIG. 4 is a cross-sectional view showing cross section VV in FIG. [Figure 6]3 is a detailed view of part B in FIG. 2, and is a cross-sectional view showing the first punch unit 5 and the first die unit 6 when the first station P1 punches out a portion other than the outer shape of the steel plate 31. FIG. [Figure 7] 3 is a detailed view of part B in FIG. 2, and is a cross-sectional view showing the first punch unit 5 and the first die unit 6 when the first station P1 punches out the outer shape of the steel plate 31. FIG. [Figure 8] 2 is a cross-sectional view showing the fourth station P4 along the line II-II in FIG. 1, illustrating a case where only the fourth die unit 22 rotates. [Figure 9] 3 is a cross-sectional view showing a second station P2 along the cross section III-III in FIG. 1. FIG. [Figure 10] 6 is a plan view showing the line VI-VI in FIG. 9 and including a partial cross section of the second station P2. [Figure 11] 11 is a cross-sectional view showing a section VII-VII in FIG. 10, in which a part of the second station P2 is extracted. [Figure 12] 11A and 11B are cross-sectional views showing a part of the second station P2 taken along the line VIII-VIII in FIG. 10, where (a) shows a state in which the second punch is capable of punching, and (b) shows a state in which the second punch is not capable of punching. [Figure 13] 1 shows an example of a laminated steel sheet 32 ​​manufactured by the laminated steel sheet manufacturing apparatus 1 of the present invention, where (a) is a perspective view, (b) is a plan view, and (c) is a side view. [Figure 14] 4 is a cross-sectional view showing the adhesive applicator 40 along the line IV-IV in FIG. 1, illustrating a state in which adhesive is applied from a nozzle tip 45 to a steel sheet material 30. FIG. [Figure 15] 15 is a cross-sectional view of the adhesive applicator 40 shown in FIG. 14, showing a portion relating to the upper mold 2, and illustrating a state in which adhesive is applied from a nozzle tip 45 to a steel sheet material 30. FIG. [Figure 16] 15 is a cross-sectional view of the adhesive applicator 40 shown in FIG. 14, showing a portion relating to the upper die 2, in which no adhesive is applied from the nozzle tip 45 to the steel sheet material 30. FIG. [Figure 17]This is a cross-sectional view of the adhesive applicator 40 shown in Figure 14, which shows the state in which the nozzle tip 45 is separated from the steel plate material 30, and explains that when the killer pin 49 does not press the switching passive cam 46b, the adhesive applicator 40 will lean downward due to its own weight. [Figure 18] 15 is a cross-sectional view of the adhesive applicator 40 shown in FIG. 14, showing a portion relating to the lower mold 3, and illustrating a state in which adhesive is applied from a nozzle tip 45 to a steel sheet material 30. FIG. [Figure 19] 15 is a cross-sectional view of the adhesive applicator 40 shown in FIG. 14, showing a portion relating to the lower mold 3, in which no adhesive is applied from the nozzle tip 45 to the steel sheet material 30. FIG. [Figure 20] This is a cross-sectional view of the adhesive applicator 40 shown in Figure 14, extracting a portion relating to the lower mold 3, and shows the state in which the nozzle tip 45 is separated from the steel plate material 30. This figure explains that when the killer pin 49 does not press the switching passive cam 46b, the adhesive applicator 40 will lean downward due to its own weight. [Figure 21] 15A and 15B are enlarged partial views showing the nozzle unit 42 of the adhesive applicator 40 in FIG. 14, showing a state in which the adhesive 41 is not applied to the steel plate material 30, where (a) shows the state when the upper die is at the top dead center, and (b) shows the state in which the upper die has descended and the adhesive 41 is exposed from the nozzle tip 45. [Figure 22] 15A and 15B are enlarged partial views showing the nozzle unit 42 of the adhesive applicator 40 in FIG. 14, illustrating the operation of applying adhesive 41 to the steel plate material 30, where (a) shows the upper die 2 at the bottom dead center, and (b) is a detailed view of part E in (a). [Figure 23] 15 is a partially enlarged view showing the nozzle unit 42 of the adhesive applicator 40 in FIG. 14, showing the state in which the upper die 2 has returned to the top dead center after the adhesive 41 has been applied to the steel plate material 30. [Figure 24]The positions where adhesive 41 is applied to a steel plate material 30 and a steel plate 31 by an adhesive application device 40 of the present invention are shown, where (a) shows the position where adhesive 41 is applied to a steel plate 31, and (b) shows the position where adhesive 41 is applied to a steel plate material 30. [Figure 25] 2 is a block diagram showing a control device 500 of the laminated steel sheet manufacturing apparatus 1. FIG. [Figure 26] FIG. 1 is a perspective view showing a conventional laminated steel sheet 300. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, a laminated steel sheet manufacturing apparatus 1 and a laminated steel sheet manufacturing method embodying the present invention will be described with reference to the drawings. The referenced drawings are used to explain technical features that can be adopted by the present invention. The configuration of the apparatus shown in the drawings is merely an illustrative example and is not intended to limit the scope of the present invention.

[0028] <<Explanation of laminated steel sheet manufacturing equipment 1>> A laminated steel sheet manufacturing apparatus 1 according to a first embodiment of the present invention will be described. The laminated steel sheet manufacturing apparatus 1 is a manufacturing apparatus for manufacturing a laminated steel sheet 32 ​​by stacking steel sheets 31 that are punched into a predetermined shape from a steel sheet material 30. As shown in Fig. 2 etc., the laminated steel sheet manufacturing apparatus 1 is equipped with a mold 4 including a pair of upper and lower molds 2 and 3 that are movable relative to one another in the vertical direction in order to punch the steel sheet material 30. As shown in Fig. 1, the mold 4 is equipped with a first station P1.

[0029] <<Explanation of the first station P1>> As shown in FIG. 2, the first station P1 includes a first press section T1 and a first rotary drive section 7. The first press section T1 includes a first punch unit 5 in the upper die 2 and a first die unit 6 in the lower die 3. The first rotary drive section 7 includes a first punch drive section 8 that rotates the first punch unit 5 around the first press section center C1, and a first die drive section 9 that rotates the first die unit 6. In the example shown in FIG. 1, the first station P1 is located upstream in the conveying direction of the fourth station P4, which punches out the outer shape of the steel sheet 31.

[0030] <Explanation of First Rotational Drive Unit 7> The first rotary drive unit 7 will be described with reference to FIG. 3. The first rotary drive unit 7 includes a first punch drive unit 8 that rotates the first punch unit 5 and a first die drive unit 9 that rotates the first die unit 6. The first punch drive unit 8 and the first die drive unit 9 are rotatable around a drive unit center Cd that extends vertically. At a position radially spaced from the drive unit center Cd, one of the first punch drive unit 8 and the first die drive unit 9 includes a drive guide pin 10, and the other includes a drive guide pin hole 11. In the example shown in FIG. 3, the drive guide pin 10 is located in the first punch drive unit 8, and the drive guide pin hole 11 is located in the first die drive unit 9.

[0031] When the upper die 2 and the lower die 3 move relative to each other, the drive guide pin 10 is supported to slide vertically while constantly maintaining an engaged state with the drive guide pin hole 11. When either the first punch drive unit 8 or the first die drive unit 9 rotates, the other is rotated following the engagement between the drive guide pin 10 and the drive guide pin hole 11. When punching out the steel plate material 30, the first punch unit 5 and the first die unit 6 are each rotated in one direction by a first angle θ1 after each punching or after each predetermined number of punchings.

[0032] 3, the first rotary drive unit 7 is fixed to the lower mold 3 and includes a lower drive shaft 12 centered on the drive unit center Cd, and an upper drive shaft 13 supported rotatably about the drive unit center Cd with respect to the upper mold 2. The first die drive unit 9 is rotatable about the lower drive shaft 12, and the first punch drive unit 8 is formed integrally with the upper drive shaft 13 and is rotatable relative to the upper mold 2. When the first die drive unit 9 rotates, the first punch drive unit 8 is rotated accordingly.

[0033] Next, the configuration of the first rotary drive unit 7 will be described in detail with reference to FIG. 3 . First, the first die drive unit 9 will be described. The lower drive shaft 12, which is the rotation support shaft of the first die drive unit 9, is fixed to a lower drive shaft holding block 73 of the lower mold 3 with a bolt 74. A first die side pulley 72, a drive source pulley 68, and a lower rotor 76 are rotatably attached to the lower drive shaft 12, in this order from bottom to top, via radial bearings 70. A thrust bearing 57 is attached between the first die side pulley 72 and the lower drive shaft holding block 73 to reduce the rotational load of the first die side pulley 72. The first die side pulley 72, the drive source pulley 68, and the lower rotor 76 are each fastened in the vertical direction with a bolt 66 and rotate integrally.

[0034] As shown in Figures 2 and 3, a drive source timing belt 67 is looped around the drive source pulley 68, and the rotation of a first rotary drive source 502 is transmitted to the first die drive unit 9. A servo motor is typically used as the first rotary drive source 502. A first die timing belt 71 is looped around the first die side pulley 72, and the rotation is transmitted to a first die side driven pulley 94 of the first die unit 6 shown in Figure 6. Belt guides 69 are attached to the drive source pulley 68 and the first die side pulley 72, respectively, to prevent the timing belts from slipping. A lift prevention plate 79 is fastened to the upper end of the lower drive shaft 12 with a bolt 77, and a thrust bearing 57 is interposed between the lift prevention plate 79 and the lower rotor 76.

[0035] Next, the drive guide pin 10 and the drive guide pin hole 11 will be described. As shown in FIG. 5, the lower rotor 76 has drive guide pin holes 11 at multiple locations in the circumferential direction centered on the drive unit center Cd. In the example shown in FIG. 5, four drive guide pin holes 11 are provided at equal angular intervals on the same radius in the circumferential direction. There is no limit to the number of drive guide pin holes 11, and it is sufficient to have at least one. As shown in FIG. 4, the drive guide pin hole 11 has a guide bush 65 attached to the lower rotor 76 and a ball retainer 63 attached inside the guide bush 65. A spring 64 is attached between the ball retainer 63 and the belt guide 69 of the drive source pulley 68.

[0036] The drive guide pin 10 of the first punch driver 8 is mounted in the drive guide pin hole 11 so as to be slidable in the vertical direction. The drive guide pin 10 is supported by a guide bush 65 in the drive guide pin hole 11 via a ball retainer 63. As shown in FIG. 4( a), when the upper die 2 is at the top dead center relative to the lower die 3, the drive guide pin 10 moves upward. At that time, the ball retainer 63 is pushed upward by the elastic force of the spring 64, and the sliding state between the drive guide pin 10 and the ball retainer 63 is maintained. As shown in FIG. 4( b), when the upper die 2 is at the bottom dead center relative to the lower die 3, the drive guide pin 10 moves downward. At that time, the ball retainer 63 moves downward against the elastic force of the spring 64 in accordance with the movement of the drive guide pin 10, and the sliding state between the drive guide pin 10 and the ball retainer 63 is maintained. The drive guide pin 10 and the drive guide pin hole 11 described above are constantly sliding and maintain an engagement relationship regardless of the relative movement between the upper mold 2 and the lower mold 3.

[0037] Next, the first punch drive unit 8 will be described. As shown in FIG. 3, the upper drive shaft 13 is slidably supported by the upper pulley holding block 53 of the upper die 2 via a radial bearing 52 and a thrust bearing 57. As shown in FIG. 2, the upper pulley holding block 53 is fixed to the upper die set 24. A first punch side drive pulley 50 is fixed to a part of the pulley holding rotor 55, and a first punch timing belt 56 is wound around it. As shown in FIG. 6, the first punch timing belt 56 is connected to a first punch side driven pulley 83 of the first punch unit 5, and the rotation of the first punch side drive pulley 50 is transmitted to the first punch timing belt 56.

[0038] As shown in Fig. 3, a pulley holding rotor 55 is attached to the underside of the first punch side drive pulley 50, and they are fastened together with bolts 60. The pulley holding rotor 55 has two parts, an upper part and an lower part, which are joined together with bolts 59. Furthermore, an upper driving rotor 61 is attached to the underside of the pulley holding rotor 55, and they are fastened together with the bolts 60. The drive guide pin 10, which has already been described, is fixed to the upper driving rotor 61. The underside of the pulley holding rotor 55 is placed on the upper pulley holding block 53 via a thrust bearing 57, and the upper driving rotor 61 is slidably supported by the upper pulley holding block 53 via a radial bearing 58. A bearing cover 51 is attached to the upper side of the upper drive shaft 13, and prevents the radial bearing 52 from coming off.

[0039] With the configuration of the first rotation drive unit 7 described above, when the first rotation drive source 502 is driven, rotation is transmitted to the drive source pulley 68, and at the same time, the first die side pulley 72 of the first die drive unit 9 rotates, and the rotation is transmitted to the first die side driven pulley 94 of the first die unit 6 shown in FIG. 6. The rotation of the drive source pulley 68 causes the first punch side drive pulley 50 of the first punch drive unit 8 to rotate via the drive guide pin 10 engaged with the drive guide pin hole 11, and the rotation is transmitted to the first punch side driven pulley 83 of the first punch unit 5 shown in FIG. 6.

[0040] <Effects of first rotary drive unit 7> The first rotational drive unit 7 of the first station P1 in the laminated steel sheet manufacturing apparatus 1 described above has the following advantages. As shown in FIGS. 3 to 5 , in the laminated steel sheet manufacturing apparatus 1, when the upper mold 2 and the lower mold 3 move relative to each other, the drive guide pin 10 is slidably supported in the vertical direction while constantly maintaining an engaged state with the drive guide pin hole 11. When either the first punch drive unit 8 or the first die drive unit 9 rotates, the other is rotated following the engagement between the drive guide pin 10 and the drive guide pin hole 11. Therefore, in the first station P1 of the laminated steel sheet manufacturing apparatus 1, the first punch drive unit 8 and the first die drive unit 9 rotate with little phase shift in the circumferential direction, and therefore the first punch unit 5 and the first die unit 6 can punch out the steel sheet material 30 with little phase shift from each other in the circumferential direction.

[0041] 3, in the first station P1 of the laminated steel sheet manufacturing apparatus 1, the first die drive unit 9 is rotatable around the lower drive shaft 12, and the first punch drive unit 8 is integrally formed with the upper drive shaft 13 and is rotatable relative to the upper die 2. When the first die drive unit 9 rotates, the first punch drive unit 8 is rotated accordingly, so that the first die drive unit 9 and the first punch drive unit 8 rotate stably. Therefore, the first punch unit 5 and the first die unit 6 can be rotated stably.

[0042] If the first punch unit 5 and the first die unit 6 were in a state where there was a large circumferential phase misalignment between them, the first punch 5a and the first die 6a would interfere with each other and be damaged every time the steel sheet material 30 was punched. This would reduce the punching accuracy of the steel sheet 31 and increase the frequency of maintenance of the laminated steel sheet manufacturing apparatus 1. In contrast, the configuration of the first station P1 in the laminated steel sheet manufacturing apparatus 1 of the present invention can improve the punching accuracy of the steel sheet 31 and reduce the frequency of maintenance.

[0043] <Explanation of First Press Department T1> Next, the first press section T1 in the first station P1 will be described. The first punch unit 5 and the first die unit 6 in the first press section T1 can be configured to be capable of punching out the steel sheet 31 except for its outer shape, or can be configured to be capable of punching out the outer shape of the steel sheet 31. The examples shown in FIGS. 1 and 6 show a case in which the first press section T1 in the first station P1 is capable of punching out the steel sheet 31 except for its outer shape. Note that, if the first station P1 is capable of punching out the outer shape of the steel sheet 31, it becomes the final station for punching out the steel sheet 31. In this case, the first station P1 may be located at a position corresponding to the fourth station P4 described below.

[0044] <Configuration of first press unit T1 in the first embodiment> Next, the first press section T1 of the first embodiment will be described. The first press section T1 of the first embodiment is capable of punching out the steel plate 31 except for its outer shape. As shown in FIG. 1 , the steel plate material 30 is strip-shaped, and the laminated steel plate manufacturing apparatus 1 includes a third station P3 upstream of the first station P1 in the conveying direction of the steel plate material 30, where the die 4 is located. An opening 33 is formed in the steel plate material 30 at the third station P3. The opening 33 is formed so as to open in a predetermined range including the center C1 of the first press section when the steel plate material 30 is conveyed to the first station P1.

[0045] In the first press section T1, one of the first punch unit 5 and the first die unit 6 is provided with a pilot pin 14, and the other is provided with a pilot pin hole 15. In the example shown in FIG. 6 , the first punch unit 5 is provided with the pilot pin 14, and the first die unit 6 is provided with the pilot pin hole 15. Although not shown, the first punch unit 5 may be provided with the pilot pin hole 15, and the first die unit 6 may be provided with the pilot pin 14. The pilot pin 14 and the pilot pin hole 15 are arranged at positions corresponding to the inside of the opening 33 formed in the steel plate material 30. The pilot pin 14 is inserted into and removed from the pilot pin hole 15 every time the upper die 2 and the lower die 3 move relative to each other and the first punch unit 5 punches out the steel plate material 30.

[0046] 2 and 3, the first punch unit 5 is rotationally driven by a first punch driving section 8, and the first die unit 6 is rotationally driven by a first die driving section 9. As a result, a slight phase shift may occur in the circumferential direction between the first punch unit 5 and the first die unit 6. However, the pilot pin 14 is inserted into and removed from the pilot pin hole 15, thereby eliminating the phase shift between the first punch unit 5 and the first die unit 6.

[0047] 1 and 6, a slot 36 is formed in a first processing section 35 at a first station P1. When punching out a slot 36, the first punch unit 5 and the first die unit 6 each rotate in one direction by a first angle θ1 each time the slot 36 is punched out or after a predetermined number of punches have been performed. For example, when the first punch unit 5 and the first die unit 6 rotate by the first angle θ1 each time the slot 36 is punched out, the steel sheet material 30 being conveyed downstream has a state in which the slot 36 has a phase difference of the first angle θ1.

[0048] Next, the first press section T1 will be described in detail with reference to FIG. 6. The first press section T1 includes a first punch unit 5 and a first die unit 6. First, the first punch unit 5 will be described. The first punch unit 5 is formed in the upper die 2, and rotates upon receiving rotational drive from the first punch drive section 8. The first punch side driven pulley 83 rotates around the first press section center C1 due to the movement of the first punch timing belt 56, causing the first punch unit 5 to rotate.

[0049] The upper side of the first punch side driven pulley 83 is fastened to a first punch upper rotor 81 arranged below the backup plate 80 of the upper die 2, and the lower side is fastened to a first punch holding rotor 82 so that they can rotate integrally. The first punch upper rotor 81 and the first punch holding rotor 82 are rotatable around the center C1 of the first press part via a radial bearing 58 between them and the upper die 2. The first punch side driven pulley 83 is rotatable while being supported from below in the vertical direction via a thrust bearing 57 on its lower side facing a part of the upper die 2.

[0050] As shown in Fig. 6, the first punch unit 5 further includes a stripper rotor 90. The stripper rotor 90 is fastened to an upper power transmission rotor 87 that is disposed between the backup plate 84 of the upper die 2 and a stripper holder 97. The stripper rotor 90 and the upper power transmission rotor 87 are positioned by a positioning pin 88. The upper power transmission rotor 87 is supported rotatably around the center C1 of the first press section between the stripper holder 97 and the thrust bearing 57 and the radial bearing 58 interposed therebetween.

[0051] The first punch 5a is supported in the vertical direction by the first punch holding rotor 82, the upper power transmission rotor 87, and the stripper rotor 90, and moves in conjunction with the movement of the upper die 2. A punch key plate 96 fixed to the first punch holding rotor 82 engages with the punch notch portion 5b of the first punch 5a, and the first punch 5a moves in conjunction with the movement of the upper die 2.

[0052] The pilot pin 14 passes through the first punch side driven pulley 83, the upper power transmission rotor 87, and the stripper rotor 90. The pilot pin 14 is supported by a guide bush 86 attached to the first punch holding rotor 82, and is inserted into and removed from a guide bush 89 attached to the first die 6a of the first die unit 6 as the upper die 2 moves. The inside of the guide bush 89 is the pilot pin hole 15. As shown in FIG. 6 , the pilot pin 14 is formed inside the first punch 5a at a position corresponding to the opening 33. Similarly, the pilot pin hole 15 is formed inside the first die 6a at a position corresponding to the opening 33. One or more pairs of pilot pins 14 and pilot pin holes 15 may be provided.

[0053] Members such as the first punch side driven pulley 83 move in synchronization with the upper die 2, but when the upper die 2 moves toward the lower die 3, the stripper rotator 90 comes into contact with and presses the steel sheet material 30 before the first punch 5a punches out the steel sheet material 30. Furthermore, members such as the first punch side driven pulley 83 and members such as the stripper rotator 90 rotate synchronously around the first press section center C1 together with the first punch 5a and the pilot pin 14. The pilot pin 14 is inserted into the pilot pin hole 15 at a timing earlier than the first punch 5a and the stripper rotator 90 come into contact with the steel sheet material 30.

[0054] Next, the first die unit 6 will be described with reference to FIG. 6 . The first die 6a is fixed to a first die rotor 93, which is rotatably supported on the lower die 3 via a radial bearing 58. A first die driven pulley 94 is fastened to the underside of the first die rotor 93. The first die driven pulley 94 includes a belt guide 54, and a first die timing belt 71 is looped around it. When the first die drive unit 9 is driven, the first die driven pulley 94 is rotated by the first die timing belt 71, and the first die 6a rotates together with the first die rotor 93. The lower die 3 includes a bearing boss 95, and the first die driven pulley 94 is rotatable relative to the lower die 3 via a radial bearing 70. The first punch unit 5 and the first die unit 6 are rotatable around the first press center C1.

[0055] <Effects when the first press section T1 is the first embodiment> The first press section T1 described above, in the first embodiment, provides the following advantages. As shown in FIG. 6 , in the first press section T1 of the laminated steel sheet manufacturing apparatus 1, the first station P1 includes a pilot pin 14 in one of the first punch unit 5 and the first die unit 6, and a pilot pin hole 15 in the other. The first station P1 is positioned at a position corresponding to the inside of an opening 33 formed in the steel sheet material 30. The pilot pin 14 is inserted into and removed from the pilot pin hole 15 each time the first press section T1 punches out the steel sheet material 30. Therefore, the circumferential phase shift between the first punch unit 5 and the first die unit 6 is corrected each time the steel sheet material 30 is punched out, thereby preventing the accumulation of phase error. Furthermore, because the pilot pin 14 and the pilot pin hole 15 are formed in a predetermined range including the center C1 of the first press section, the die 4 can be made more compact than if they were formed outside the range where the steel sheet 31 is formed.

[0056] Furthermore, the first press unit T1 of the laminated steel sheet manufacturing apparatus 1 is capable of punching out the portion excluding the outer shape of the steel sheet 31. As shown in Fig. 13, the slots 36 punched in the first station P1 can form a shape oblique to the stacking direction when the steel sheets are stacked.

[0057] As in the example shown in FIG. 13, when laminated steel sheet 32 ​​is used as a stator for an armature, windings are wound in slots 36. Since slots 36 are oblique to the lamination direction, windings are also wound obliquely along slots 36. Therefore, when a stator made of laminated steel sheet 32 ​​is used in combination with a rotor having permanent magnets formed thereon, the rotor can rotate smoothly. Note that in a conventional laminated steel sheet 300 shown in FIG. 26, slots 301 and notches 302 on the periphery are shaped along the lamination direction.

[0058] <Description of the Case Where the Fourth Station P4 is Combined with the First Station P1 Equipped with the First Press Section T1 of the First Embodiment> Next, a case where a fourth station P4 is combined with a first station P1 equipped with the first press section T1 of the first embodiment will be described. As shown in Fig. 1, the steel sheet material 30 is strip-shaped, and the die 4 is equipped with the fourth station P4 downstream of the first station P1 in the conveying direction of the steel sheet material 30. As shown in Fig. 8, the fourth station P4 is capable of punching out the outer shape of the steel sheet 31, and is equipped with a fourth punch unit 21 in the upper die 2 and a fourth die unit 22 in the lower die 3.

[0059] Of the fourth punch unit 21 and the fourth die unit 22, at least the fourth die unit 22 is rotatable around the fourth press center C4. When punching and forming the steel sheet 31, the fourth die unit 22 is rotated in one direction by a second angle θ2 each time one steel sheet 31 or a predetermined number of steel sheets 31 are punched. The direction of rotation by the first angle θ1 at the first station P1 and the direction of rotation by the second angle θ2 at the fourth station P4 may be the same or opposite to each other. When the outer shape of the steel sheet 31 is punched and stacked at the fourth station P4, the slot 36 is formed at a skew angle relative to the stacking direction. The skew angle is determined by the combination of the first angle θ1 and the second angle θ2.

[0060] Next, the fourth station P4 will be described in detail with reference to FIG. 8. The fourth station P4 is a station that punches out the outer shape of the steel sheet 31. The fourth station P4 includes a fourth press section T4 and a fourth rotary drive section 23. In the example shown in FIG. 8, the fourth punch unit 21 does not rotate, and only the fourth die unit 22 is rotatable around the fourth press section center C4. The fourth die unit 22 has the same basic configuration as the first die unit 6 already described, but includes a steel sheet guide path 133 so that the punched steel sheets 31 are stacked.

[0061] The fourth rotation drive part 23 includes a servo motor serving as a fourth rotation drive source 504, a fourth die drive pulley 134, and a fourth die timing belt 129. The fourth punch unit 21 has a fourth punch 21a fixed to a fourth punch plate 120 fixed to the upper die set 24, and moves in accordance with the movement of the upper die 2. The fourth punch unit 21 also includes a stripper plate 123 fixed to a stripper holder 122.

[0062] In the fourth die unit 22, the fourth die 22a, which is fixed to the fourth die rotor 126, is rotatable between the fourth die 22a and the lower die set 25 via a radial bearing 52. The fourth die side driven pulley 130 is fixed to the fourth die rotor 126 and is rotatable between the fourth die 22a and the lower die set 25 via a thrust bearing 57. The fourth die timing belt 129 is wound around the fourth die drive pulley 134 and the fourth die side driven pulley 130, and rotation of the fourth rotation drive source 504 is transmitted to the fourth die side driven pulley 130, thereby rotating the fourth die unit 22. Note that although the fourth press section T4 has been described as being configured such that only the fourth die unit 22 rotates, the fourth punch unit 21 may also rotate synchronously with the fourth die unit 22. In this case, the configuration of the first press section T1 and the first rotation drive section 7 of the second embodiment, which will be described later, may also be applied.

[0063] <Effects of combining the fourth station P4 with the first station P1 equipped with the first press section T1 of the first embodiment> Combining the fourth station P4 with the first station P1 equipped with the first press section T1 of the first embodiment as described above provides the following effects. As described with reference to Figures 1 to 6 and 8, the laminated steel sheet manufacturing apparatus 1 can punch out the steel sheet material 30 at the first station P1 so that a shape can be formed diagonally in the stacking direction, and can punch out the outer shape of the steel sheet 31 with rolling at the fourth station P4. Therefore, the laminated steel sheet manufacturing apparatus 1 can manufacture a laminated steel sheet 32 ​​that has a slot 36 formed in part that is diagonal to the stacking direction and that has reduced deviation in the thickness direction, as shown in the example of Figure 13.

[0064] Furthermore, if the shape of the steel sheet 31 punched at the fourth station P4 matches the shape when rotated by the second angle θ2, it is possible to form a laminated steel sheet 32 ​​having notches 34a that are continuous in the stacking direction. As shown in FIG. 13(a), the slots 36 are formed obliquely with respect to the stacking direction, and the notches 34a on the periphery are formed along the stacking direction. In other words, the laminated steel sheet manufacturing apparatus 1 can manufacture a laminated steel sheet 32 ​​that has both a shape formed obliquely with respect to the stacking direction and a shape formed along the stacking direction.

[0065] When the laminated steel sheet 32 ​​is used as a stator of an armature, the notches 34a formed along the lamination direction facilitate attachment to other components, etc. If the outer peripheral notches 34a were formed obliquely to the lamination direction like the slots 36, attachment to other components, etc., could be hindered.

[0066] <Description of the case where the first press unit T1 is the second embodiment> Next, with reference to FIG. 7, a description will be given of the first press section T1 of the second embodiment. The first press section T1 of the second embodiment is capable of punching out the outer shape of the steel sheet 31. The first rotary drive unit 7 is the same as that of the first embodiment. With reference to FIG. 7, differences from FIG. 6, which has already been described, will be described. Elements different from those in FIG. 6 are designated by different reference numerals. The pilot pin 114 is disposed on the outer side of the first punch 105a. Similarly, the pilot pin hole 115 is disposed on the outer side of the first die 106a. In the example shown in FIG. 6, a member is present inside the first die 106a, so the pilot pin hole 115 can be formed. However, in the example shown in FIG. 7, the steel sheet guide path 133 is formed inside the first die 106a, so the pilot pin hole 115 cannot be formed. The first die rotor 193 fixes the first die 106a and rotates integrally with the first die-side driven pulley 94, as in the case of FIG. 6. Similarly to the fourth die unit 22, the fourth die unit 23 also includes a steel plate guide path 133 for stacking the punched steel plates 31.

[0067] <Effects when the first press section T1 is the second embodiment> The first press section T1 of the second embodiment described above has the following advantages. As shown in FIG. 7 , the first station P1 is capable of punching out the outer shape of the steel sheet 31. Since the first punch unit 5 and the first die unit 6 are rotated while being rolled, the laminated steel sheet 32 ​​can be formed without the steel sheets 31 being limited to a point-symmetric shape. Therefore, in addition to the advantages of the first rotation drive unit 7, the laminated steel sheet manufacturing apparatus 1 can manufacture laminated steel sheets 32 with little deviation in the thickness direction without any restrictions on the shape of the steel sheets 31.

[0068] <Description of the configuration that forms a discontinuous shape in the loading direction> Next, a configuration for forming a discontinuous shape in the stacking direction in a laminated steel sheet 32 ​​will be described with reference to Fig. 1 and Figs. 9 to 13. As shown in Fig. 1, a laminated steel sheet manufacturing apparatus 1 includes a second station P2. The second station P2 includes a second punch 16 in an upper mold 2 and a punch selection device 17 that selects whether or not the second punch 16 is in a state where it can punch out the steel sheet material 30. The lower mold 3 includes a second die 18.

[0069] The punch selection device 17 can select a state in which the second punch 16 is capable of punching or a state in which it is not capable of punching every time the steel plate material 30 is punched or every predetermined number of times.

[0070] 10 to 12, the punch selection device 17 includes a punch slide cam 226 and a push pin 228 that is pressed vertically by the punch slide cam 226. When the push pin 228 is pressed down, the second punch 16 is in a state where it can punch, and when the push pin 228 is not pressed down, the second punch 16 is in a state where it cannot punch.

[0071] The punch selection device 17 will be described in detail with reference to Figures 9 to 13. The second station P2 forms discontinuous notches 34b as shown in Figure 13, for example. As shown in Figure 10, the punch selection device 17, the second punch 16, and the second die 18 are provided at four locations at 90-degree intervals around the second station center C2.

[0072] As shown in FIG. 11 , the punch selector 17 is disposed in the upper die set 24 and includes a punch slide cam 226 that slides via an actuation shaft pin 230 driven by an air cylinder 229. The punch slide cam 226 is guided in its horizontal movement by a slide cam holder 227. When the punch slide cam 226 moves to the right as shown in the figure, the cam protrusion 226a presses the push pin 228 downward. FIG. 12( a) shows a state in which the push pin 228 is pressed down by the cam protrusion 226a, enabling the second punch 16 to punch the steel plate material 30. FIG. 12( b) shows a state in which the cam recess 226b faces the push pin 228, disabling the second punch 16 from punching the steel plate material 30.

[0073] 12, the second punch 16 has a punch key groove 16a formed in a part thereof, and the amount of movement thereof is restricted by a punch key plate 232 fixed to the second punch plate 220. The punch selection device 17 is controlled by a punch control device 520, which will be described later, to determine whether or not the second punch 16 is capable of punching the steel plate material 30.

[0074] <Effect of the structure that forms a discontinuous shape in the loading direction> The above-described configuration for forming a discontinuous shape in the stacking direction has the following advantages. As shown in Figures 10 to 12, when punching a steel plate material 30, the laminated steel plate manufacturing apparatus 1 can select a state in which the punch selector 17 can punch the second punch 16 or a state in which it cannot punch, each time the punching operation is performed or after a predetermined number of punching operations. Therefore, the laminated steel plate manufacturing apparatus 1 can form a discontinuous shape in the stacking direction of the laminated steel plate 32.

[0075] Furthermore, in the laminated steel plate manufacturing apparatus 1, when the push pin 228 is pressed down by the punch slide cam 226, the second punch 16 is in a state where it can punch, and when the push pin 228 is not pressed down, the second punch 16 is in a state where it cannot punch. Thus, the second punch 16 can be set between a state where it can punch and a state where it cannot punch, and a discontinuous shape can be formed in the stacking direction of the laminated steel plate 32.

[0076] As shown in the example of Figure 13, the punch selection device 17 of the laminated steel sheet manufacturing apparatus 1 can manufacture laminated steel sheets 32 having notches 34b that are discontinuous in the stacking direction. Without the punch selection device 17, it is not possible to form a discontinuous shape in the stacking direction, so post-processing is required. The discontinuous notches 34b in the stacking direction are useful because they can be used for positioning or attachment when assembling to other parts, etc.

[0077] <Description of Adhesive Applicator 40> Next, the adhesive applicator 40 will be described with reference to Fig. 14 to Fig. 24. The adhesive applicator 40 is provided in at least one of the upper mold 2 and the lower mold 3, and applies an adhesive 41 to the steel sheet material 30. In the following description, the adhesive applicator 40 will be described on the assumption that it is mounted on the laminated steel sheet manufacturing apparatus 1, but this is not limiting, and the adhesive applicator 40 can be mounted on any apparatus that applies the adhesive 41 to the steel sheet material 30 and manufactures a laminated steel sheet 32 ​​by stacking punched steel sheets 31.

[0078] As shown in Figure 14 etc., the adhesive applicator 40 is provided in at least one of the upper mold 2 and the lower mold 3, and is a device that applies an adhesive 41 to a steel plate material 30. The adhesive applicator 40 includes a nozzle unit 42 that applies the adhesive 41 to the steel plate material 30, an adhesive reservoir 43 that stores the adhesive 41, and a supply pipe 44 that supplies the adhesive 41 from the adhesive reservoir 43 to the nozzle unit 42. The adhesive applicator 40 further includes a nozzle tip 45 that is formed in the nozzle unit 42 and applies the adhesive 41 to the steel plate material 30, and a nozzle gap adjustment device 47 that can adjust the gap ag between the nozzle tip 45 and the steel plate material 30 when the nozzle tip 45 is closest to the steel plate material 30.

[0079] 14 to 23 show examples in which the adhesive applicator 40 is disposed in both the upper mold 2 and the lower mold 3. As shown in FIG. 1, the adhesive applicator 40 is disposed in the fifth station P5, which is upstream of the fourth station P4 where the outer shape of the steel sheet 31 is punched out. If the adhesive 41 is quick-drying, it is desirable to dispose the adhesive applicator 40 as close as possible to the station where the outer shape is punched out. Note that the adhesive applicator 40 may be disposed in only one of the upper mold 2 or the lower mold 3.

[0080] The overall configuration of adhesive applicator 40 will be described with reference to Figure 14. In adhesive applicator 40 arranged in upper mold 2, adhesive reservoirs 43 are formed in either upper die set 24 or upper mold 2, and either lower die set 25 or lower mold 3, and adhesive 41 is supplied to nozzle unit 42 by supply pipe 44.

[0081] The nozzle unit 42 has a nozzle tip 45 that applies the adhesive 41 to the steel plate material 30, and moves as the upper mold 2 and the lower mold 3 move in the vertical direction. As shown in Figure 22, when the nozzle tip 45 is closest to the steel plate material 30, there is a gap ag between the nozzle tip 45 and the steel plate material 30, and the exposed tip of the adhesive 41 comes into contact with the steel plate material 30.

[0082] 21 to 23, the state when adhesive 41 is applied to steel plate material 30 by adhesive application device 40 will be described. Nozzle unit 42 has O-ring 150, nozzle valve 149, and spring 151 inside nozzle housing 152 connected to supply pipe 44, and has nozzle tip portion 45 at the tip of nozzle housing 152. O-ring 150 prevents adhesive 41 from leaking from supply pipe 44.

[0083] FIG. 21(a) shows the upper mold 2 at its top dead center, with no adhesive 41 being supplied from the adhesive reservoir 43. At this time, the nozzle valve 149 is pushed up toward the side opposite the nozzle tip 45 by the elastic force of the spring 151, blocking the supply pipe 44. FIG. 21(b) shows the upper mold 2 in the middle of descending toward the lower mold 3, with the supply of adhesive 41 starting from the adhesive reservoir 43. At this time, the pressure of the adhesive 41 causes the nozzle valve 149 to move against the spring 151 toward the nozzle tip 45, supplying the adhesive 41 to the nozzle tip 45. The adhesive 41 is exposed from the nozzle tip 45. The adhesive 41 is usually viscous, and is kept exposed from the nozzle tip 45 by surface tension.

[0084] 21 and 22, the nozzle unit 42 provided in the upper die 2 moves toward the steel plate material 30 in conjunction with the movement of the upper die 2. The nozzle unit 42 provided in the lower die 3 moves toward the steel plate material 30 in conjunction with the movement of the upper die 2. A description of the configuration in which the nozzle unit 42 provided in the lower die 3 moves in conjunction with the movement of the upper die 2 will be omitted.

[0085] 22 , when the nozzle unit 42 is provided in the upper mold 2, the stripper plate 140 presses the first surface 30a of the steel sheet material 30 before the nozzle tip 45 exposes the adhesive 41, thereby maintaining a constant distance ag1 between the nozzle tip 45 and the first surface 30a of the steel sheet material 30. A nozzle recess 160 is formed in the stripper plate 140 to protect the nozzle tip 45.

[0086] 22 , when the nozzle unit 42 is provided in the lower mold 3, the lower stripper plate 141 presses the second surface 30b of the steel sheet material 30 before the nozzle tip 45 exposes the adhesive 41, thereby maintaining a constant distance ag2 between the nozzle tip 45 and the second surface 30b of the steel sheet material 30. A nozzle recess 160 is formed in the lower stripper plate 141 to protect the nozzle tip 45.

[0087] FIG. 22( a) shows a state in which the upper die 2 has reached the bottom dead center, and shows a state in which the adhesive applicator 40 applies adhesive 41 to the steel sheet material 30. As shown in FIG. 22( b), the upper stripper plate 140 and the lower stripper plate 141 are in contact with the steel sheet material 30, but the nozzle tip 45 is separated from the steel sheet material 30 by a distance ag. The adhesive 41 is exposed from the nozzle tip 45 and applied to the steel sheet material 30 while in contact with it. At this time, the amount of adhesive 41 applied is controlled by the adhesive supply pressure from the adhesive reservoir 43 and the size of the distance ag. That is, when the amount of adhesive 41 is to be increased, the distance ag is increased and the adhesive supply pressure is increased. Conversely, when the amount of adhesive 41 is to be decreased, the distance ag is decreased and the adhesive supply pressure is reduced.

[0088] 23 shows a state in which the upper die 2 returns to the top dead center, and shows a state in which the adhesive 41 is applied to the steel plate material 30 and the nozzle unit 42 is separated from the steel plate material 30. The nozzle tip 45 does not come into contact with the steel plate material 30, and only the adhesive 41 comes into contact with the steel plate material 30, thereby applying the adhesive 41. At this time, the nozzle unit 42 provided in the upper die 2 is separated from the steel plate material 30 by the upper nozzle holding plate 146, which moves in conjunction with the movement of the upper die 2. The nozzle unit 42 provided in the lower die 3 is separated from the steel plate material 30 by the lower nozzle holding plate 148, which moves in conjunction with the movement of the upper die 2.

[0089] Next, the nozzle interval adjustment device 47 will be described in detail. As shown in Figures 14 to 20, the adhesive applicator 40 is equipped with a nozzle interval adjustment device 47 that adjusts the interval ag between the nozzle tip 45 and the steel sheet material 30 when the nozzle tip 45 is closest to the steel sheet material 30. The nozzle interval adjustment device 47 is equipped with a interval adjustment cam 47a and a interval adjustment block 47b that can be moved in the movement direction of the nozzle unit 42 by the interval adjustment cam 47a.

[0090] As shown in Figure 14, the nozzle gap adjustment device 47 is adjusted by a rotary adjuster 144. The contact surfaces of both the gap adjustment cam 47a and the gap adjustment block 47b are tapered. Using Figure 15 as an example, as the gap adjustment cam 47a moves to the right, the gap adjustment block 47b moves downward, reducing the gap ag between the nozzle tip 45 and the steel plate material 30. Figure 15 shows a state in which the gap adjustment cam 47a has moved to the farthest right, and the gap ag between the nozzle tip 45 and the steel plate material 30 is at its smallest. Figure 18 similarly shows a state in which the gap ag between the nozzle tip 45 and the steel plate material 30 is at its smallest.

[0091] 14 and other figures, when an adhesive applicator 40 is provided in both the upper mold 2 and the lower mold 3, a nozzle interval adjustment device 47 is provided independently in the upper mold 2 and the lower mold 3. The interval ag can be adjusted independently in the upper mold 2 and the lower mold 3. A first interval ag1 between the first surface 30a of the steel sheet material 30 and the nozzle tip 45 is adjusted by the nozzle interval adjustment device 47 provided in the upper mold 2, and a second interval ag2 between the second surface 30b of the steel sheet material 30 and the nozzle tip 45 is adjusted by the nozzle interval adjustment device 47 provided in the lower mold 3.

[0092] Next, the nozzle switching device 46 will be described. As shown in FIGS. 14 to 20, the laminated steel sheet manufacturing apparatus 1 is equipped with the nozzle switching device 46. The nozzle switching device 46 is disposed between the nozzle interval adjustment device 47 and the nozzle unit 42, and can switch the nozzle unit 42 between a state in which the adhesive 41 is applied to the steel sheet material 30 and a state in which the adhesive 41 is not applied. The nozzle switching device 46 is equipped with a switching actuating cam 46a, a switching passive cam 46b, and a holding member 143. The switching actuating cam 46a moves in a direction perpendicular to the direction in which the nozzle unit 42 moves in association with the movement of the upper mold 2. The switching passive cam 46b moves in the direction in which the nozzle unit 42 moves in association with the movement of the upper mold 2, by actuation of the switching actuating cam 46a. The holding member 143 holds the switching actuating cam 46a and / or the switching passive cam 46b in the direction in which the nozzle unit 42 moves in association with the movement of the upper mold 2. For example, the switching passive cam 46b is fixed to the nozzle unit 42.

[0093] 15 and 18 show a state in which the nozzle unit 42 is close to the steel plate material 30 and ready to bond. In the nozzle switching device 46, the switching actuating cam 46a moves left and right as shown in the figure by an air cylinder 142. The switching actuating cam 46a and the switching passive cam 46b have uneven shapes made up of peaks and valleys formed on their opposing surfaces. FIGS. 15 and 18 show a state in which the peaks are in contact with each other, and the nozzle tip 45 is close to the steel plate material 30. Also, FIGS. 16 and 19 show a state in which the valleys of the switching actuating cam 46a and the switching passive cam 46b face each other, and the nozzle tip 45 is away from the steel plate material 30.

[0094] In the example shown in Figures 15 and 16, a holding member 143a is formed on a nozzle holding plate 146 and presses the gap adjustment block 47b and the switching actuating cam 46a by a spring 145. When the switching actuating cam 46a moves in the left-right direction as shown in the figure, the frictional resistance between the gap adjustment block 47b and the switching passive cam 46b is reduced. In the example shown in Figures 18 and 19, a holding member 143b is formed on the lower die set 25 and presses the switching passive cam 46b and the switching actuating cam 46a by a spring 145. As in the example of Figure 15, when the switching actuating cam 46a moves in the left-right direction as shown in the figure, the frictional resistance between the gap adjustment block 47b and the switching passive cam 46b is reduced.

[0095] As shown in Figures 15 and 16, when the adhesive applicator 40 is provided in the upper mold 2, the holding member 143a holds the gap adjustment block 47b and the switching actuating cam 46a. This reduces friction between the switching actuating cam 46a and the gap adjustment block 47b and between the switching actuating cam 46a and the switching passive cam 46b when the switching actuating cam 46a moves left and right as shown in the figure. If the holding member 143a were not present, the gap adjustment block 47b and the switching actuating cam 46a would move down due to their own weight and press against the switching passive cam 46b. This could prevent the nozzle switching device 46 from operating when the switching actuating cam 46a is operated, as the peaks and valleys of the switching actuating cam 46a and the switching passive cam 46b would collide with each other.

[0096] 18 and 19, when the adhesive applicator 40 is provided in the lower mold 3, the holding member 143b holds the switching passive cam 46b and the switching operating cam 46a. This reduces friction between the switching operating cam 46a and the switching passive cam 46b and between the switching operating cam 46a and the gap adjustment block 47b when the switching operating cam 46a moves left and right as shown. If the holding member 143 were not present, the nozzle unit 42 would move down due to its own weight and press against the switching passive cam 46b. This could result in the nozzle switching device 46 being unable to operate when operating the switching operating cam 46a because the peaks and valleys of the switching passive cam 46b would collide with each other.

[0097] Next, the killer pin 49 will be described. As shown in FIG. 14 and other figures, the adhesive applicator 40 is equipped with a killer pin 49. The killer pin 49 comes into direct or indirect contact with the nozzle unit 42, and applies a pressing force by the elastic force of a spring 147 so that the nozzle unit 42 moves in a direction away from the steel sheet material 30. The nozzle unit 42 is maintained in a state of direct or indirect contact with the nozzle spacing adjustment device 47. As shown in FIG. 14 and other figures, the killer pin 49 comes into contact with and presses the switching passive cam 46b by the spring 147. Since the switching passive cam 46b is fixed to the nozzle unit 42, the nozzle unit 42 comes into indirect contact with the killer pin 49.

[0098] Although not shown, the killer pin 49 may be configured to directly contact and press the upper nozzle holding plate 146 or the lower nozzle holding plate 148 to which the nozzle housing 152 is fixed.

[0099] Next, the function of the killer pin 49 will be described. If the killer pin 49 does not press the switching passive cam 46b, the nozzle unit 42 will tend to lean downward due to its own weight. As shown in Figure 17, there is a possibility that a gap g2 will occur between the switching actuating cam 46a and the interval adjustment block 47b, and a gap g3 will occur between the switching actuating cam 46a and the switching passive cam 46b.

[0100] 17, when the killer pin 49 is not in contact with the switching passive cam 46b, the interval adjustment block 47b, the switching passive cam 46b, and the nozzle unit 42 tend to move downward due to their own weight. As a result, there is a possibility that a gap g1 may occur between the interval adjustment block 47b and the switching passive cam 46b, a gap g2 may occur between the switching actuating cam 46a and the interval adjustment block 47b, and a gap g3 may occur between the switching actuating cam 46a and the switching passive cam 46b.

[0101] 15 and 16, when the killer pin 49 acts, it presses the switching passive cam 46b, thereby maintaining a state in which it indirectly presses the nozzle unit 42. In the example shown in Fig. 16, when the upper die 2 descends, the gap g3 is eliminated, the nozzle tip 45 and the steel plate material 30 are separated from each other, and the adhesive 41 is not applied.

[0102] As shown in Figure 20, if the killer pin 49 does not contact the switching passive cam 46b, the gap adjustment block 47b will attempt to descend due to its own weight. The switching actuating cam 46a is pushed up by the spring 145 of the holding member 143, which may result in a gap g4 between the switching actuating cam 46a and the gap adjustment block 47b. Figure 20 shows a state in which the nozzle holding plate upper 146 and the nozzle unit 42 are shifted upward, which may result in a gap g5 between the switching actuating cam 46a and the switching passive cam 46b. In other words, the gap g5 causes play in the vertical direction, which may cause the nozzle unit 42 and the like to move up and down due to vibration.

[0103] 19, when the killer pin 49 acts, it presses the switching passive cam 46b, thereby maintaining a state in which it indirectly presses the nozzle unit 42, thereby eliminating the gap g5. When the nozzle unit 42 rises in conjunction with the lowering of the upper die 2, the nozzle tip 45 and the steel plate material 30 are spaced apart, and the adhesive 41 is not applied.

[0104] As explained with reference to Figures 15 to 20, the killer pin 49 eliminates all gaps from gap g1 to gap g5, and the distances ag1 and ag2 between the nozzle tip 45 and the steel plate material 30 are maintained at constant distances.

[0105] 14 and other figures, the adhesive applicator 40 may be provided on the upper mold 2 and the lower mold 3 with the steel plate material 30 sandwiched therebetween, and when the upper mold 2 and the lower mold 3 move in a direction toward each other, the adhesive 41 may be applied to the first surface 30a and the second surface 30b of the steel plate material 30. Alternatively, the adhesive applicator 40 may be provided on only one of the upper mold 2 and the lower mold 3.

[0106] Furthermore, as shown in Figure 14 etc., when the adhesive applicator 40 is provided on the upper mold 2 and the lower mold 3, sandwiching the steel plate material 30, the adhesive 41 loaded on the adhesive applicator 40 consists of two types of liquid agents, a main agent 41a and a secondary agent 41b, and the adhesive 41 on either the upper mold 2 or the lower mold 3 may be the main agent 41a and the adhesive 41 on the other may be the secondary agent 41b.

[0107] <Effects of the adhesive applying device 40> The adhesive applicator 40 described above has the following effects. As shown in Figures 21 and 22 , when the nozzle tip 45 of the adhesive applicator 40 is closest to the steel plate material 30, there is a gap ag between the nozzle tip 45 and the steel plate material 30, and the tip of the exposed adhesive 41 comes into contact with the steel plate material 30. The gap ag can be adjusted by the nozzle gap adjustment device 47, so the amount of adhesive 41 exposed at the gap ag can be adjusted.

[0108] This allows the nozzle tip 45 to dispense an appropriate amount of adhesive 41 while remaining spaced apart from the steel plate material 30. Adhesives 41 vary in viscosity, adhesive strength, and other properties depending on the type used. If the gap ag is constant, the types of adhesives 41 that can be used are limited, reducing the flexibility in selecting the adhesive 41. In contrast, the adhesive dispenser 40 can adjust the gap ag to match the properties of the adhesive 41 used, thereby broadening the range of adhesives 41 that can be selected and improving adhesive strength. Additionally, the adhesive dispenser 40 can more precisely adjust the amount of adhesive 41 dispensed by adjusting the pressure of the adhesive 41 supplied from the adhesive reservoir 43. Furthermore, since the nozzle tip 45 has the gap ag between it and the steel plate material 30, it is possible to prevent damage to the steel plate material 30 due to contact with the steel plate material 30.

[0109] As shown in FIG. 14 and other figures, when an adhesive applicator 40 is provided on both the upper mold 2 and the lower mold 3, the gap ag can be adjusted independently for the upper mold 2 and the lower mold 3. That is, the first gap ag1 between the nozzle tip 45 and the first surface 30a of the steel sheet material 30 and the second gap ag2 between the nozzle tip 45 and the second surface 30b of the steel sheet material 30 can be adjusted in different states. This allows the use of adhesives 41 with different appropriate gap ag characteristics for the first surface 30a and the second surface 30b of the steel sheet material 30. Alternatively, the first gap ag1 and the second gap ag2 can be set to be different, thereby allowing the amount of adhesive 41 applied to the first surface 30a and the second surface 30b to be different. In the example shown in FIG. 21 and other figures, the first surface 30a is the upper surface of the steel sheet material 30, and the second surface 30b is the lower surface.

[0110] Next, we will explain the effects of the detailed configuration of the nozzle gap adjustment device 47. As shown in Figure 14 etc., the nozzle gap adjustment device 47 of the adhesive applicator 40 can adjust the gap ag between the nozzle unit 42 and the steel plate material 30 by actuating the gap adjustment cam 47a to move the gap adjustment block 47b.

[0111] Next, the effect of the nozzle switching device 46 will be described. As shown in FIGS. 14 to 20, the laminated steel sheet manufacturing apparatus 1 can use the nozzle switching device 46 to switch between a state in which the nozzle unit 42 applies the adhesive 41 and a state in which it does not. This makes it possible to set whether or not to bond each time a steel sheet material 30 is punched out, or for each predetermined number of sheets. For example, the nozzle switching device 46 can stop applying the adhesive 41 when a predetermined number of steel sheets 31 have been stacked. Furthermore, the holding member 143 holds the switching actuating cam 46a and / or the switching passive cam 46b in the direction in which the nozzle unit 42 moves in conjunction with the movement of the upper die 2, so that the switching actuating cam 46a can move smoothly relative to the switching passive cam 46b.

[0112] Next, the effect of the killer pin 49 will be described. As shown in FIG. 14 and other figures, in the adhesive applicator 40, the killer pin 49 applies a pressing force to the nozzle unit 42 by elastic force. Furthermore, the switching passive cam 46b, which is integral with the nozzle unit 42, contacts the switching actuating cam 46a, and the switching actuating cam 46a is maintained in contact with the nozzle gap adjustment device 47. Therefore, the adhesive applicator 40 is prevented from rattling even when the upper die 2 moves at high speed. Furthermore, as shown in FIGS. 17 and 20, when the switching actuating cam 46a operates to stop the adhesive 41 from being applied, the gap ag between the nozzle tip 45 and the steel sheet material 30 is maintained constant.

[0113] Furthermore, when the adhesive applicator 40 is provided on both the upper mold 2 and the lower mold 3, the adhesive 41 is applied to the first surface 30a and the second surface 30b of the steel sheet material 30. Therefore, the adhesive 41 can be applied to the first surface 30a and the second surface 30b in a single process, thereby reducing the number of steps required to apply the adhesive 41. Furthermore, the processes of applying the adhesive 41 to the first surface 30a and the second surface 30b can be performed separately rather than simultaneously.

[0114] Furthermore, the adhesive 41 of one of the upper mold 2 and the lower mold 3 may be a main agent 41a, and the adhesive 41 of the other may be a secondary agent 41b, and the adhesives 41 may be applied to opposing positions on the upper and lower surfaces of the steel sheet material 30. In this case, when the steel sheets 31 are stacked, the main agent 41a and the secondary agent 41b come into contact with each other and undergo a hardening reaction to bond them together. Therefore, the laminated steel sheet manufacturing apparatus 1 can prevent the adhesive 41 from drying or hardening and reducing its adhesive ability before the steel sheets 31 are stacked.

[0115] <Explanation of the control device 500> Next, with reference to Fig. 25, a control device 500 that controls each element of the laminated steel sheet manufacturing apparatus 1 of the present invention will be described. The control device 500 receives instructions for each element via an input device 501. The input device 501 is used not only to input the start and stop of the punching operation of the steel sheet 31, but also to input the number of punched sheets, which determines how many steel sheet materials 30 should be punched at each time the first press unit T1 and the fourth press unit T4 are rotated in the first station P1 and the fourth station P4. The input device 501 also sets the first angle θ1 at the first station P1 and the second angle θ2 at the fourth station P4.

[0116] Information input to the input device 501 is received by an input / output interface 511, and various processes are performed by a CPU 512. The CPU 512 performs first rotation drive source drive processing by a first control device 515, fourth rotation drive source drive processing by a fourth control device 516, transfer drive circuit drive processing by a transfer control device 521 that transfers the steel plate material 30, die lift drive processing for lifting and lowering the upper die 2 by a die lift control device 517, and punch selection drive processing by a punch control device 520. With respect to these processes, a ROM 513 and a RAM 514 perform information storage processing.

[0117] Next, the CPU 512 provides the processed drive information to each drive circuit from the input / output interface 511. When driving the first rotary drive source 502, the CPU 512 provides drive information to the first rotary drive circuit 503 to drive it. When driving the fourth rotary drive source 504, the CPU 512 provides drive information to the fourth rotary drive circuit 505 to drive it. When driving the transfer drive source 507 that transfers the steel plate material 30, the CPU 512 provides drive information to the transfer drive circuit 506 to drive it. When driving the punch selection drive source 519, the CPU 512 provides drive information to the punch selection drive circuit 518 to drive it. When raising and lowering the upper die 2 relative to the lower die 3, the CPU 512 provides drive information to the die lift drive circuit 508, and the die lift drive source 509 drives the die lift drive device 510.

[0118] <<Explanation of laminated steel sheet manufacturing method>> <Explanation of the first laminated steel sheet manufacturing method> Next, a laminated steel sheet manufacturing method according to a second embodiment of the present invention will be described. A first laminated steel sheet manufacturing method will be described, in which a shape that is skewed with respect to the stacking direction is formed in a part of the laminated steel sheet 32. The first laminated steel sheet manufacturing method is a method of manufacturing the laminated steel sheet 32 ​​by punching a strip-shaped steel sheet material 30 that is transported in one direction using the laminated steel sheet manufacturing apparatus 1 already described. The mold 4 is equipped with a mold lifting control device 517 that controls the relative movement between the upper mold 2 and the lower mold 3.

[0119] As shown in FIGS. 2, 3, and 25, the first rotational drive unit 7 includes a first rotational drive source 502 that rotates the first punch unit 5 and the first die unit 6, and a first control device 515 that controls the first rotational drive source 502. The first laminated steel sheet manufacturing method includes the following steps: a first step S11 in which the die lifting control device 517 relatively moves the upper die 2 and the lower die 3, thereby relatively moving the first punch unit 5 and the first die unit 6 to punch out the steel sheet material 30; a second step S12 in which the first control device 515 rotates the first rotational drive source 502 in one direction or a predetermined number of times, thereby rotating the first punch unit 5 and the first die unit 6 in one direction by a first angle θ1; a third step S13 in which the steel sheet material 30 is conveyed by a predetermined amount; and a fourth step S14 in which the outer shape of the steel sheet 31 is punched out and the steel sheets 31 are laminated.

[0120] The first processed portions 35 formed at the first station P1 have a phase difference of a first angle θ1 with respect to the first processed portion center Ch1 between adjacent first processed portions 35 in the conveying direction after passing through the second step S12 and the third step S13. When the steel plates 31 are stacked in the fourth step S14, the first processed portions 35 form a shape skewed with respect to the stacking direction. The first processed portions 35 are slots 36, as shown in the example of FIG. 13(a). The laminated steel plate 32 formed by stacking the steel plates 31 forms a shape in which the slots 36 are skewed with respect to the stacking direction. When the outer shape is formed in the fourth step S14, the outer peripheral shape is formed in a shape that follows the stacking direction, as shown by the notches 34a in FIGS. 13(a) and 13(c). In other words, the slots 36 are skewed, and the outer peripheral notches 34a are formed in a shape that follows the stacking direction.

[0121] <Effects of the first laminated steel sheet manufacturing method> The first laminated steel sheet manufacturing method described above provides the following advantages. As shown in FIGS. 1 to 6 , the first processed portions 35 formed in the first station P1 form a phase difference of a first angle θ1 with respect to the first processed portion center Ch1 between adjacent first processed portions 35 in the conveyance direction after passing through the second step S12 and the third step S13. When the steel sheets 31 are stacked in the fourth step S14, the first processed portions 35 can be formed in a skewed state with respect to the stacking direction. Therefore, a shape skewed with respect to the stacking direction can be formed without performing post-processing. Furthermore, a shape aligned with the stacking direction can be formed in the fourth step S14. Therefore, as illustrated in FIG. 13( a), a slot 36 skewed with respect to the stacking direction can be formed. Furthermore, the outer peripheral notch 34a can be formed with a shape aligned with the stacking direction. The advantages of applying the laminated steel sheet 32 ​​manufactured by the first laminated steel sheet manufacturing method to the stator of an armature have already been described.

[0122] <Explanation of the second laminated steel sheet manufacturing method> Next, a second laminated steel sheet manufacturing method will be described. The second laminated steel sheet manufacturing method is a method for manufacturing a laminated steel sheet 32 ​​using the laminated steel sheet manufacturing apparatus 1 already described, and is a method for forming a shape that is discontinuous in the stacking direction. The second laminated steel sheet manufacturing method includes the following steps. It includes a first step S21 in which the second punch 16 is set to a punching-enabled state by the punch selection device 17 described with reference to Figures 9 to 12 and punches out a second shape portion 34 that is part of the shape of the steel sheet 31, and a second step S22 in which the punch selection device 17 sets the second punch 16 to a punching-disabled state and stops punching out the second shape portion 34.

[0123] Furthermore, after the first step S21 or the second step S22, there is provided a third step S23 of conveying a predetermined amount of steel plate material 30, and after the third step S23, there is provided a fourth step S24 of punching out the outer shape of steel plate 31 and stacking steel plates 31. The second laminated steel plate manufacturing method includes the first step S21 and the second step S22, thereby forming a laminated steel plate 32 having a discontinuous shape in the stacking direction. As shown in the examples of Figures 13(a) and (c), discontinuous notches 34b are formed on the outer periphery of laminated steel plate 32.

[0124] <Effects of the second laminated steel sheet manufacturing method> The second laminated steel sheet manufacturing method described above has the following advantages. As described with reference to FIGS. 10 to 12 , the second laminated steel sheet manufacturing method includes a first step S21 of punching the second shaped portion 34 by setting the second punch 16 to a punching-enabled state, and a second step S22 of stopping punching of the second shaped portion 34 by setting the second punch 16 to a punching-disabled state. Therefore, a laminated steel sheet 32 ​​having a discontinuous shape in the stacking direction can be formed without post-processing. As illustrated in FIG. 13 , the second laminated steel sheet manufacturing method can form discontinuous notches 34b in the stacking direction in the laminated steel sheet 32. The advantages of the laminated steel sheet 32 ​​having discontinuous notches 34b in the stacking direction manufactured by the second laminated steel sheet manufacturing method have already been described.

[0125] <Explanation of the third laminated steel sheet manufacturing method> Next, a third laminated steel sheet manufacturing method will be described. The third laminated steel sheet manufacturing method utilizes the laminated steel sheet manufacturing apparatus 1 already described, and is a manufacturing method in which a skewed shape is formed in a portion of the laminated steel sheet 32 ​​and rolling is performed when punching out the outer shape. The third laminated steel sheet manufacturing method includes the following steps. In the first station P1 described with reference to FIGS. 1 to 6, the upper mold 2 and the lower mold 3 are moved relatively to move the first punch unit 5 and the first die unit 6 relatively to punch out a portion of the steel sheet 31 from the steel sheet material 30. After the first step S31, the method includes a second step S32 in which the first punch unit 5 and the first die unit 6 are rotated in one direction by a first angle θ1 every time or every predetermined number of times.

[0126] Furthermore, after the second step S32, there is a third step S33 of transporting the steel plate material 30 to a fourth station P4. After the third step S33, there is a fourth step S34 of relatively moving the fourth punch unit 21 and the fourth die unit 22 by relatively moving the upper die 2 and the lower die 3 to punch out the outer shape of the steel plate 31 partially formed at the first station P1 and stack the steel plates 31. There is a fifth step S35 of rotating the fourth die unit 22 in one direction by a second angle θ2 every time one steel plate 31 or a predetermined number of steel plates 31 have been punched out.

[0127] <Effects of the third laminated steel sheet manufacturing method> The third laminated steel sheet manufacturing method described above has the following advantages. In the third laminated steel sheet manufacturing method, the first processed portions 35 formed in the first station P1 have a phase difference of a first angle θ1 with respect to the first processed portion center Ch1 between first processed portions 35 adjacent to each other in the conveyance direction after passing through the second step S32 and the third step S33. When the steel sheets 31 are stacked with rotation in the fourth step S34, the first processed portions 35 can be formed in a state skewed with respect to the stacking direction, and a laminated steel sheet 32 ​​can be manufactured with reduced deviation in the thickness direction.

[0128] Furthermore, if the shape of the steel sheet 31 punched out in the fourth step S34 matches the shape when rotated by the second angle θ2, the laminated steel sheet 32 ​​can be formed as a shape that is continuous in the stacking direction. As shown in Fig. 13(a), the slots 36 are formed obliquely with respect to the stacking direction, and the peripheral notches 34a are formed along the stacking direction. In other words, the third laminated steel sheet manufacturing method can manufacture a laminated steel sheet 32 ​​that has both a shape formed obliquely with respect to the stacking direction and a shape formed along the stacking direction.

[0129] Furthermore, if the shape punched out in the fourth step S34 includes a shape that matches when rotated by the second angle θ2, it is possible to manufacture a laminated steel plate 32 that has both a shape formed in the stacking direction and a shape formed diagonally relative to the stacking direction.

[0130] <Explanation of the fourth laminated steel sheet manufacturing method> Next, a fourth laminated steel sheet manufacturing method will be described. The fourth laminated steel sheet manufacturing method is a method of manufacturing laminated steel sheets 32 by rolling in the first station P1 of the laminated steel sheet manufacturing apparatus 1 already described. The fourth laminated steel sheet manufacturing method includes the following steps. As shown in FIG. 7 , the fourth laminated steel sheet manufacturing method includes a first step S41 in which the upper mold 2 and the lower mold 3 are moved relatively to each other, thereby relatively moving the first punch unit 5 and the first die unit 6 to punch out the outer shape of the steel sheets 31 and stack the steel sheets 31. After the first step S41, a second step S42 is included in which the first punch unit 5 and the first die unit 6 are rotated in one direction by a first angle θ1 every time or every predetermined number of times.

[0131] <Effects of the fourth laminated steel sheet manufacturing method> The fourth laminated steel sheet manufacturing method described above has the following advantages. The fourth laminated steel sheet manufacturing method can punch out the outer shape of the steel sheets 31 in the first station P1 and manufacture the laminated steel sheet 32 ​​by rolling. Therefore, in addition to the advantages of the first rotational drive unit 7, it is possible to laminate steel sheets 31 having shapes other than point symmetry, and it is possible to manufacture the laminated steel sheet 32 ​​with reduced deviation in the thickness direction.

[0132] <<Explanation and effects of steel plate bonding methods>> Next, a first steel plate bonding method according to a second embodiment of the present invention will be described. The first steel plate bonding method is a method for manufacturing a laminated steel plate 32 by bonding steel plates 31 using the adhesive applicator 40 already described, and includes the following steps: a first step S51 in which the nozzle gap adjustment device 47 of the adhesive applicator 40 described with reference to Figures 14 to 22 adjusts the gap ag between the nozzle tip 45 and the steel plate material 30 when the nozzle tip 45 is closest to the steel plate material 30; after the first step S51, a second step S52 in which adhesive 41 is applied to the steel plate material 30; and after the second step S52, a third step S53 in which punched steel plates 31 are laminated and bonded.

[0133] The first steel plate bonding method described above has the following advantages. The first steel plate bonding method can apply adhesive 41 to the steel plate material 30 after adjusting the distance ag between the nozzle tip 45 and the steel plate material 30 using the nozzle distance adjustment device 47. Therefore, the first steel plate bonding method can stack and bond steel plates 31 to which an appropriate amount of adhesive 41 has been applied.

[0134] Next, a second steel plate bonding method will be described. The second steel plate bonding method is a method for manufacturing a laminated steel plate 32 by bonding steel plates 31 using the adhesive applicator 40 already described, and includes the following steps: a first step S61 in which a nozzle spacing adjustment device 47 provided in the upper mold 2 adjusts a first distance ag1 between the steel plate material 30 and the nozzle tip 45 when the nozzle tip 45 is closest to the first surface 30a of the steel plate material 30; a second step S62 in which a nozzle spacing adjustment device 47 provided in the lower mold 3 adjusts a second distance ag2 between the steel plate material 30 and the nozzle tip 45 when the nozzle tip 45 is closest to the second surface 30b of the steel plate material 30; after the first step S61 and the second step S62, a third step S63 applies adhesive 41 to the steel plate material 30; and after the third step S63, a fourth step S64 in which steel plates 31 whose outlines have been punched are laminated and bonded.

[0135] The second steel plate bonding method described above has the following advantages. After adjusting the first distance ag1 between the nozzle tip 45 and the first surface 30a of the steel plate material 30 and the second distance ag2 between the nozzle tip 45 and the second surface 30b, the adhesive 41 is applied. Therefore, an appropriate amount of adhesive 41 can be applied to each of the first surface 30a and the second surface 30b, and the steel plates 31 can be laminated and bonded.

[0136] Next, a third steel plate bonding method will be described. The third steel plate bonding method is a method for manufacturing a laminated steel plate 32 by bonding steel plates 31 using the adhesive applicator 40 already described, and includes the following steps: a first step S71 in which a nozzle spacing adjustment device 47 provided in the upper mold 2 adjusts a first distance ag1 between the steel plate material 30 and the nozzle tip 45 when the nozzle tip 45 is closest to the first surface 30a of the steel plate material 30; and a second step S72 in which a nozzle spacing adjustment device 47 provided in the lower mold 3 adjusts a second distance ag2 between the steel plate material 30 and the nozzle tip 45 when the nozzle tip 45 is closest to the second surface 30b of the steel plate material 30. After the first step S71 and the second step S72, a third step S73 in which a main adhesive 41a is applied to the first surface 30a by the adhesive applicator 40, and a fourth step S74 in which a secondary adhesive 41b is applied to the second surface 30b at a position corresponding to the position where the main adhesive 41a was applied, are performed. After the third step S73 and the fourth step S74, a fifth step S75 is provided in which the steel plates 31 having the punched outer shape are stacked and bonded together.

[0137] The third steel plate bonding method described above has the following advantages. The adhesive 41 can be applied after adjusting the first distance ag1 between the nozzle tip 45 and the first surface 30a of the steel plate material 30, and the second distance ag2 between the nozzle tip 45 and the second surface 30b. Therefore, the first distance ag1 appropriate for the main agent 41a to be applied to the first surface 30a and the second distance ag2 appropriate for the secondary agent 41b to be applied to the second surface 30b are adjusted before application, so that an appropriate amount of the main agent 41a can be applied to the first surface 30a and an appropriate amount of the secondary agent 41b can be applied to the second surface 30b, thereby allowing the steel plates 31 to be laminated and bonded. [Explanation of symbols]

[0138] 2 Upper mold 3 Lower mold 4. Mold 30 Steel plate material 30a Front page 30b Second side 31 Steel plate 32 Laminated steel plate 40 Adhesive application device 41 Adhesive 41a Main Agent 41b Adjuvants 42 Nozzle unit 43 Adhesive reservoir 44 Supply pipe 45 Nozzle tip 46 Nozzle switching device 46a Switching cam 46b Switching passive cam 47 Nozzle spacing adjustment device 47a Spacing adjustment cam 47b Spacing adjustment block 49 Killer Pin 143, 143a, 143b holding members S51, S61, S71 First process S52, S62, S72 second process S63, S73 Third process S74 Fourth process S75 Fifth process ag1 first interval ag2 second interval

Claims

1. An adhesive applicator incorporated in a manufacturing apparatus for manufacturing laminated steel plates, the apparatus comprising a pair of upper and lower dies that are movable relative to one another in a vertical direction in order to punch out a steel plate material, and stacking steel plates that are punched into a predetermined shape from the steel plate material, provided on at least one of the upper mold and the lower mold, a nozzle unit that applies adhesive to the steel plate material; an adhesive reservoir that stores the adhesive; a supply pipe for supplying the adhesive from the adhesive reservoir to the nozzle unit; a nozzle tip portion formed in the nozzle unit and configured to apply the adhesive to the steel plate material; a nozzle interval adjustment device that adjusts the interval between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material; a nozzle holding plate and a stripper plate formed on the upper mold and / or the lower mold, the nozzle holding plate holds the nozzle unit; When the upper die moves toward the steel plate material, the nozzle unit and the nozzle holding plate move toward the steel plate material in accordance with the movement of the upper die, the stripper plate pressurizes the steel plate material and maintains a constant distance between the nozzle tip and the steel plate material; Further, a killer pin is provided which comes into direct or indirect contact with the nozzle unit and applies a pressing force by elastic force so that the nozzle unit moves in a direction away from the steel plate material, The adhesive applicator, wherein the nozzle unit is maintained in direct or indirect contact with the nozzle spacing adjustment device.

2. An adhesive applicator incorporated in a manufacturing apparatus for manufacturing laminated steel plates, the apparatus comprising a pair of upper and lower dies that are movable relative to one another in a vertical direction in order to punch out a steel plate material, and stacking steel plates that are punched into a predetermined shape from the steel plate material, provided on at least one of the upper mold and the lower mold, a nozzle unit that applies adhesive to the steel plate material; an adhesive reservoir that stores the adhesive; a supply pipe for supplying the adhesive from the adhesive reservoir to the nozzle unit; a nozzle tip portion formed in the nozzle unit and configured to apply the adhesive to the steel plate material; a nozzle interval adjustment device for adjusting the interval between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material, The nozzle interval adjustment device is A spacing adjustment cam; a spacing adjustment block that is contactable with the spacing adjustment cam and that is movable in the movement direction of the nozzle unit by the spacing adjustment cam; The contact surfaces of the gap adjusting cam and the gap adjusting block are both tapered, The gap adjusting cam moves relative to the gap adjusting block, thereby adjusting the gap between the nozzle tip and the steel plate material, When the gap adjusting cam has moved the most in one direction relative to the gap adjusting block, the gap between the nozzle tip and the steel plate material is minimized, Further, a killer pin is provided which comes into direct or indirect contact with the nozzle unit and applies a pressing force by elastic force so that the nozzle unit moves in a direction away from the steel plate material, The adhesive applicator, wherein the nozzle unit is maintained in direct or indirect contact with the nozzle spacing adjustment device.

3. An adhesive applicator incorporated in a manufacturing apparatus for manufacturing laminated steel plates, the apparatus comprising a pair of upper and lower dies that are movable relative to one another in a vertical direction in order to punch out a steel plate material, and stacking steel plates that are punched into a predetermined shape from the steel plate material, provided on at least one of the upper mold and the lower mold, a nozzle unit that applies adhesive to the steel plate material; an adhesive reservoir that stores the adhesive; a supply pipe for supplying the adhesive from the adhesive reservoir to the nozzle unit; a nozzle tip portion formed in the nozzle unit and configured to apply the adhesive to the steel plate material; a nozzle interval adjustment device that adjusts the interval between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material; a nozzle switching device that is disposed between the nozzle interval adjustment device and the nozzle unit and that can switch the nozzle unit between a state in which the adhesive is applied to the steel plate material and a state in which the adhesive is not applied, the nozzle switching device includes a switching actuating cam, a switching passive cam, a holding member, and an elastic member that presses the holding member; the switching actuation cam is movable in a direction perpendicular to a direction in which the nozzle unit moves in association with the movement of the upper die, the switching passive cam is moved along a direction in which the nozzle unit moves in association with the movement of the upper die by the operation of the switching actuating cam, the holding member presses the switching actuating cam and / or the switching passive cam by the elastic member in a direction in which the nozzle unit moves in association with the movement of the upper mold, Further, a killer pin is provided which comes into direct or indirect contact with the nozzle unit and applies a pressing force by elastic force so that the nozzle unit moves in a direction away from the steel plate material, The adhesive applicator, wherein the nozzle unit is maintained in direct or indirect contact with the nozzle spacing adjustment device.

4. An adhesive applicator incorporated in a manufacturing apparatus for manufacturing laminated steel plates, the apparatus comprising a pair of upper and lower dies that are movable relative to one another in a vertical direction in order to punch out a steel plate material, and stacking steel plates that are punched into a predetermined shape from the steel plate material, provided on at least one of the upper mold and the lower mold, a nozzle unit that applies adhesive to the steel plate material; an adhesive reservoir that stores the adhesive; a supply pipe for supplying the adhesive from the adhesive reservoir to the nozzle unit; a nozzle tip portion formed in the nozzle unit and configured to apply the adhesive to the steel plate material; a nozzle interval adjustment device that adjusts the interval between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material; a nozzle switching device that is disposed between the nozzle interval adjustment device and the nozzle unit and that can switch the nozzle unit between a state in which the adhesive is applied to the steel plate material and a state in which the adhesive is not applied, The nozzle interval adjustment device is A spacing adjustment cam; a spacing adjustment block that is contactable with the spacing adjustment cam and that is movable in the movement direction of the nozzle unit by the spacing adjustment cam; the nozzle switching device includes a switching actuating cam, a switching passive cam, a holding member, and an elastic member that presses the holding member; the switching actuation cam is movable in a direction perpendicular to a direction in which the nozzle unit moves in association with the movement of the upper die, the switching passive cam is moved along a direction in which the nozzle unit moves in association with the movement of the upper die by the operation of the switching actuating cam, the holding member presses the interval adjustment block, and the switching actuating cam and / or the switching passive cam in a direction in which the nozzle unit moves in association with the movement of the upper mold by the elastic member; Further, a killer pin is provided which comes into direct or indirect contact with the nozzle unit and applies a pressing force by elastic force so that the nozzle unit moves in a direction away from the steel plate material, The adhesive applicator, wherein the nozzle unit is maintained in direct or indirect contact with the nozzle spacing adjustment device.

5. The upper mold and the lower mold are provided with the steel plate material sandwiched therebetween, When the upper mold and the lower mold move in a direction in which they approach each other, 2. The adhesive applying device according to claim 1, wherein the adhesive is applied to a first surface of the steel plate material and a second surface opposite to the first surface.

6. The adhesive is composed of two types of liquid agents: a main agent and a secondary agent, 6. The adhesive applying apparatus according to claim 5, wherein the adhesive of one of the upper mold and the lower mold is the main adhesive, and the adhesive of the other mold is the sub-adhesive.

7. A method for laminating and bonding steel sheets using the adhesive applicator according to any one of claims 1 to 6, comprising the steps of: The killer pin is pressed by directly or indirectly contacting the nozzle unit, bringing the nozzle unit into direct or indirect contact with the nozzle spacing adjustment device; a first step of adjusting a distance between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material by the nozzle distance adjusting device; a second step of applying the adhesive to the steel plate material after the first step; The steel plate bonding method further comprises, after the second step, a third step of laminating and bonding the punched steel plates.

8. A method for laminating and bonding steel sheets using the adhesive applicator according to claim 5, comprising the steps of: The killer pin is pressed by directly or indirectly contacting the nozzle unit, bringing the nozzle unit into direct or indirect contact with the nozzle spacing adjustment device; a first step of adjusting a first gap between the nozzle tip and the steel plate material when the nozzle tip is closest to the first surface of the steel plate material by the nozzle gap adjustment device provided in the upper die; a second step of adjusting a second gap between the nozzle tip and the steel plate material when the nozzle tip is closest to the second surface of the steel plate material by the nozzle gap adjustment device provided in the lower die; a third step of applying the adhesive to the steel plate material after the first step and the second step; The steel plate bonding method further comprises, after the third step, a fourth step of laminating and bonding the steel plates whose outer shape has been punched out.

9. A method for laminating and bonding steel sheets using the adhesive applicator according to claim 6, comprising the steps of: The killer pin is pressed by directly or indirectly contacting the nozzle unit, bringing the nozzle unit into direct or indirect contact with the nozzle spacing adjustment device; a first step of adjusting a first gap between the nozzle tip and the steel plate material when the nozzle tip is closest to the first surface of the steel plate material by the nozzle gap adjustment device provided in the upper die; a second step of adjusting a second gap between the nozzle tip and the steel plate material when the nozzle tip is closest to the second surface of the steel plate material by the nozzle gap adjustment device provided in the lower die; a third step of applying the base agent to the first surface by the adhesive applying device; a fourth step of applying the secondary agent to the second surface at a position corresponding to the position where the primary agent is applied; The steel plate bonding method includes a fifth step of laminating and bonding the steel plates whose outer shapes have been punched out after the fourth step.

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