JP7634852B2 - Adhesive application device and steel plate bonding method - Google Patents

Description

The present invention relates to an adhesive application device mounted on a laminated steel sheet manufacturing device, and a steel sheet bonding method for bonding and laminating steel sheets.

In the past, various proposals have been made regarding adhesive application devices for devices that manufacture laminated steel sheets that constitute armatures for rotating electrical equipment. For example, the outline of Patent Document 1 is as follows. A laminated steel sheet manufacturing device includes a progressive die device that uses an upper die and a lower die to punch out steel sheets from an intermittently transported hoop material. An adhesive application device is provided within the lower die and applies adhesive to corresponding locations on the lower surface of the hoop material. The adhesive application device 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 is transferred to the hoop material when the upper die descends and the stripper plate abuts the hoop material against the upper surface of the lower die. It is also described that the tip of the discharge hole can be configured to be separated from the strip-shaped thin steel sheet when the upper die descends and the stripper plate abuts the strip-shaped thin steel sheet against the upper surface of the lower die.

According to this, the adhesive application device has an adhesive supply section that constantly supplies adhesive at a predetermined pressure, and when the upper die descends, the adhesive is transferred to the hoop material, making it possible to manufacture laminated steel plates in which steel plates are bonded with adhesive.

JP 2009-124828 A

However, in conventional adhesive applicators, adhesive is constantly supplied at a predetermined pressure from the adhesive discharge section. When the adhesive applicator comes into contact with the hoop material or steel plate, the adhesive is applied. In other words, when the upper die descends and comes into contact with the hoop material or steel plate, the adhesive is applied, which poses the problem that it is difficult to control the timing of applying the adhesive. In particular, when the upper die descends and the strip-shaped thin steel plate is brought into contact with the upper surface of the lower die by the stripper plate, the gap between the tip of the discharge hole and the strip-shaped thin steel plate is constant and cannot be adjusted. In other words, there is a problem that it is difficult to adjust the amount of adhesive applied.

The object of the present invention is to provide an adhesive application device that can adjust the amount of adhesive applied depending on the characteristics of the adhesive being used.

The object of the present invention is to provide an adhesive application device that can adjust the amount of adhesive applied depending on the characteristics of the adhesive being used.

The adhesive applicator according to the first aspect of the present invention is an adhesive applicator incorporated in a manufacturing device that manufactures laminated steel plates by stacking steel plates that are punched into a predetermined shape from a steel plate material, and is provided on at least one of the upper and lower dies, and is equipped with a nozzle unit that 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 spacing between the nozzle tip and the steel plate material when the nozzle tip is closest to the steel plate material.

In this case, the adhesive application device is equipped with a nozzle spacing adjustment device, so it is possible to adjust the spacing when the nozzle tip is closest to the steel plate material. This prevents the nozzle tip from coming into contact with the steel plate material and causing damage, and allows the appropriate amount of adhesive to be applied to the steel plate material.

The nozzle spacing adjustment device of the adhesive application device may also include a spacing adjustment cam and a spacing adjustment block that can come into contact with the spacing adjustment cam and can be moved by the spacing adjustment cam in the movement direction of the nozzle unit.

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.

The adhesive application device may also include a nozzle switching device that is disposed between the nozzle interval 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 actuating cam, a switching passive cam, and a holding member, the switching actuating cam is movable in a direction perpendicular to the direction in which the nozzle unit moves in association with the movement of the upper die, the switching passive cam is movable along the direction in which the nozzle unit moves in association with the movement of the upper die by the operation of the switching actuating cam, and the holding member may hold the switching actuating cam and/or the switching passive cam in the direction in which the nozzle unit moves in association with the movement of the upper die.

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 die, so that the switching actuating cam moves smoothly relative to the switching passive cam.

The adhesive applicator may also be provided with a killer pin that directly or indirectly contacts 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.

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

The adhesive applying device may be provided on the upper and lower dies, sandwiching the steel plate material, and when the upper and lower dies 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 reverse side of the first surface.

In this case, the adhesive application device is provided on the upper and lower dies, sandwiching the steel plate material, so the time required to apply the adhesive can be shortened.

The adhesive may be made of two types of liquid, a main agent and a secondary agent, and the adhesive in either the upper mold or the lower mold may be the main agent, and the adhesive in the other mold may be the secondary agent.

In this case, the adhesive on one of the upper and lower dies is the main agent, and the adhesive on the other is the secondary agent, so when the steel plates are stacked, the main agent and secondary agent come into contact and undergo a hardening reaction to bond. Therefore, the adhesive application device can prevent the adhesive from drying or hardening before the steel plates are stacked, resulting in a decrease in adhesive ability.

The first steel plate bonding method according to the second aspect of the present invention is a method for stacking and bonding the 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 the nozzle tip is closest to the steel plate material using the nozzle distance 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.

This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel plate material, and the second distance between the nozzle tip and the second surface. Therefore, appropriate amounts of adhesive can be applied to each of the first surface and the second surface, allowing the steel plates to be laminated and bonded.

The second laminate bonding method according to the second aspect of the present invention is a method for laminate bonding the steel plates using the adhesive application device, and includes a first step of adjusting a first gap between the steel plate material and the nozzle tip when the nozzle tip is closest to the first surface of the steel plate material by the nozzle gap adjustment device provided on the upper die, a second step of adjusting a second gap between the steel plate material and the nozzle tip when the nozzle tip is closest to the second surface of the steel plate material by the nozzle gap adjustment device provided on the lower die, a third step of applying the adhesive to the steel plate material after the first and second steps, and a fourth step of laminate bonding the steel plates whose outlines have been punched out after the third step.

This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel plate 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 applied to the first surface and the second distance suitable for the secondary agent applied to the second surface, so that an appropriate amount of the main agent is applied to the first surface and an appropriate amount of the secondary agent is applied to the second surface, allowing the steel plates to be laminated and bonded.

The third laminate bonding method according to the second aspect of the present invention is a method for laminate bonding the steel plates using the adhesive application device, and includes a first step of adjusting a first distance between the steel plate material and the nozzle tip when the nozzle tip is closest to the first surface of the steel plate material by the nozzle spacing adjustment device provided on the upper die, a second step of adjusting a second distance between the steel plate material and the nozzle tip when the nozzle tip is closest to the second surface of the steel plate material by the nozzle spacing adjustment device provided on the lower die, a third step of applying the main agent to the first surface by the adhesive application device, a fourth step of applying the secondary agent to the second surface corresponding to the position where the main agent was applied, and a fifth step of laminating and bonding the steel plates whose outlines have been punched out after the fourth step.

This allows the adhesive to be applied after adjusting the first distance between the nozzle tip and the first surface of the steel plate 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 applied to the first surface and the second distance suitable for the secondary agent applied to the second surface, so that an appropriate amount of the main agent is applied to the first surface and an appropriate amount of the secondary agent is applied to the second surface, allowing the steel plates to be laminated and bonded.

FIG. 2 is a plan view showing a mold 4 of the present invention. 2 shows a cross-section II in FIG. 1, and is a cross-sectional view of the first station P1. 3 is a detailed view of part A in FIG. 2, and is a cross-sectional view showing a first rotary drive unit 7. FIG. 4A is a detailed view of part D in FIG. 3, where (a) shows a state in which the first punch drive unit 8 and the first die drive unit 9 are rotating when the upper die 2 is at the top dead center, and (b) shows a state in which the upper die 2 is at the bottom dead center and the rotation of the first punch drive unit 8 and the first die drive unit 9 has stopped. 4 is a cross-sectional view showing the cross section VV in FIG. 3. 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. 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. 1, is a cross-sectional view showing the fourth station P4, in which only the fourth die unit 22 rotates. 3 is a cross-sectional view showing a second station P2 taken along the line III-III in FIG. 1. FIG. 6 is a plan view showing a part of the second station P2 along the line VI-VI in FIG. 9 . 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. 11A and 11B are cross-sectional views taken along the line VIII-VIII in FIG. 10, showing a part of the second station P2, in which (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. 1A, 1B, and 1C show an example of a laminated steel sheet 32 manufactured by the laminated steel sheet manufacturing apparatus 1 of the present invention, in which (a) is a perspective view, (b) is a plan view, and (c) is a side view. 4 is a cross-sectional view taken along line IV-IV in FIG. 1 and showing the adhesive applying device 40, illustrating a state in which adhesive is applied from a nozzle tip portion 45 to a steel plate material 30. FIG. 15 is a cross-sectional view of a portion of the adhesive applicator 40 shown in FIG. 14 that is related to the upper die 2, and shows a state in which adhesive is applied from a nozzle tip 45 to a steel plate material 30. FIG. 15 is a cross-sectional view of a portion of the adhesive applicator 40 shown in FIG. 14 that is related to the upper die 2, and shows a state in which no adhesive is applied from the nozzle tip 45 to the steel plate material 30. FIG. This is a cross-sectional view of the portion of the adhesive applicator 40 shown in Figure 14 that relates to the upper die 2, showing the state in which the nozzle tip 45 is separated from the steel plate material 30, and explains that if the killer pin 49 does not press the switching passive cam 46b, the adhesive applicator 40 will lean downward due to its own weight. 15 is a cross-sectional view of a portion of the adhesive applicator 40 shown in FIG. 14 that is related to the lower die 3, and shows a state in which adhesive is applied from a nozzle tip 45 to a steel plate material 30. FIG. 15 is a cross-sectional view of a portion of the adhesive applicator 40 shown in FIG. 14 that is related to the lower die 3, and shows a state in which no adhesive is applied from the nozzle tip 45 to the steel plate material 30. FIG. This is a cross-sectional view of the portion of the adhesive applicator 40 shown in Figure 14 that is related to the lower die 3, showing the state in which the nozzle tip 45 is separated from the steel plate material 30, and explains that if the killer pin 49 does not press the switching passive cam 46b, the adhesive applicator 40 will lean downward due to its own weight. 15A and 15B are partially enlarged views showing the nozzle unit 42 of the adhesive applicator 40 in Figure 14, showing a state in which adhesive 41 is not applied to the steel plate material 30, with (a) showing the state when the upper die is at the top dead center and (b) showing the state in which the upper die has descended and the adhesive 41 is exposed from the nozzle tip 45. 15A and 15B are partially enlarged views showing a nozzle unit 42 of the adhesive applicator 40 in Figure 14, illustrating the operation of applying adhesive 41 to a steel plate material 30, where (a) shows the state when the upper die 2 is at the bottom dead center, and (b) is a detailed view of part E in (a). 15 is a partially enlarged view showing the nozzle unit 42 of the adhesive applicator 40 in FIG. 14, and shows a 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. The positions where adhesive 41 is applied to a steel plate material 30 and a steel plate 31 by the adhesive application device 40 of the present invention are shown, where (a) shows the position where adhesive 41 is applied to the steel plate 31, and (b) shows the position where adhesive 41 is applied to the steel plate material 30. FIG. 2 is a block diagram showing a control device 500 of the laminated steel sheet manufacturing apparatus 1. FIG. 1 is a perspective view showing a conventional laminated steel sheet 300.

Below, we will explain the laminated steel sheet manufacturing apparatus 1 and laminated steel sheet manufacturing method that embody the present invention, with reference to the drawings. The referenced drawings are used to explain the technical features that can be adopted by the present invention. The configuration of the apparatus shown in the drawings is not intended to be limiting, but is merely an illustrative example.

<<Description of laminated steel sheet manufacturing apparatus 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 to be 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 provided with a die 4 including a pair of an upper die 2 and a lower die 3 that are relatively movable along the vertical direction in order to punch the steel sheet material 30. As shown in Fig. 1, the die 4 is provided with a first station P1.

<<Explanation of 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 a 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 disposed upstream in the conveying direction of the fourth station P4 that punches out the outer shape of the steel sheet 31.

<Description 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 extending in the vertical direction. 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 in the first punch drive unit 8, and the drive guide pin hole 11 is in the first die drive unit 9.

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 between the drive guide pin hole 11. When either the first punch drive unit 8 or the first die drive unit 9 rotates, the other rotates following the engagement between the drive guide pin 10 and the drive guide pin hole 11. When punching 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 each time a punch is made or after a predetermined number of punches have been made.

In the example shown in FIG. 3, the first rotary drive unit 7 is fixed to the lower die 3 and includes a lower drive shaft 12 centered on the drive unit center Cd, and an upper drive shaft 13 rotatably supported around the drive unit center Cd relative to the upper die 2. The first die drive unit 9 is rotatable around the lower drive shaft 12, and the first punch drive unit 8 is formed integrally with the upper drive shaft 13 and rotatable relative to the upper die 2. When the first die drive unit 9 rotates, the first punch drive unit 8 is rotated accordingly.

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 rotary support shaft of the first die drive unit 9, is fixed to the lower drive shaft holding block 73 of the lower die 3 by a bolt 74. The first die side pulley 72, the drive source pulley 68, and the lower rotor 76 are rotatably attached to the lower drive shaft 12, in order from the bottom, 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 rotation 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 fastened by bolts 66 in the vertical direction, respectively, and rotate integrally.

2 and 3, a drive source timing belt 67 is hung on the drive source pulley 68, and the rotation of the first rotary drive source 502 is transmitted to the first die drive unit 9. A servo motor is usually used as the first rotary drive source 502. A first die timing belt 71 is hung on the first die side pulley 72, and the rotation is transmitted to the first die side driven pulley 94 of the first die unit 6 shown in FIG. 6. A belt guide 69 is attached to each of the drive source pulley 68 and the first die side pulley 72 to prevent the timing belts from shifting. A rise prevention plate 79 is fastened to the upper end of the lower drive shaft 12 by a bolt 77, and a thrust bearing 57 is interposed between the rise prevention plate 79 and the lower rotor 76.

Next, the drive guide pin 10 and the drive guide pin hole 11 will be described. As shown in FIG. 5, the lower rotating body 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 there must be at least one. As shown in FIG. 4, the drive guide pin hole 11 has a guide bush 65 attached to the lower rotating body 76 and a ball retainer 63 attached to the inside of 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.

The drive guide pin 10 of the first punch drive unit 8 is attached to the drive guide pin hole 11 so as to be slidable in the vertical direction. The drive guide pin 10 is supported by the guide bush 65 through the ball retainer 63 in the drive guide pin hole 11. 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 drive guide pin hole 11 described above maintain an engagement relationship with constant sliding, regardless of the relative movement between the upper die 2 and the lower die 3.

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. The 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 the 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 it.

As shown in FIG. 3, the pulley holding rotor 55 is attached to the lower side of the first punch side drive pulley 50, and is fastened to the pulley holding rotor 55 by a bolt 60. The pulley holding rotor 55 has two parts, an upper part and an lower part, which are integrated by a bolt 59. Furthermore, the upper drive rotor 61 is attached to the lower side of the pulley holding rotor 55, and is fastened to the pulley holding rotor 55 by a bolt 60. The drive guide pin 10, which has already been described, is fixed to the upper drive rotor 61. The lower side of the pulley holding rotor 55 is placed on the upper pulley holding block 53 via a thrust bearing 57, and the upper drive 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, which prevents the radial bearing 52 from coming off.

When the first rotary drive source 502 is driven by the configuration of the first rotary drive unit 7 described above, 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.

<Effects of First Rotational Drive Unit 7>
The first rotary drive unit 7 of the first station P1 in the laminated steel sheet manufacturing apparatus 1 described above has the following effects. As shown in Figs. 3 to 5, in the laminated steel sheet manufacturing apparatus 1, when the upper die 2 and the lower die 3 move relative to each other, the drive guide pin 10 is supported to slide along the vertical direction while always maintaining an engaged state between the drive guide pin hole 11. When either one of the first punch drive unit 8 and the first die drive unit 9 rotates, the other is rotated following by the engagement portion between the drive guide pin 10 and the drive guide pin hole 11. Thus, 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, so that the first punch unit 5 and the first die unit 6 can punch out the steel sheet material 30 with little phase shift between them in the circumferential direction.

As shown in FIG. 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.

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

<Explanation of the first press section 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 part of the steel plate 31 other than the outer shape, or can be configured to be capable of punching out the outer shape of the steel plate 31. The examples shown in Figs. 1 and 6 show a case in which the first press section T1 in the first station P1 can punch out the part of the steel plate 31 other than the outer shape. Note that, when the first station P1 can punch out the outer shape of the steel plate 31, it becomes the final station for punching out the steel plate 31. In this case, the first station P1 may be disposed at a position corresponding to a fourth station P4 described later.

<Configuration of first press section T1 in 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 a portion of the steel plate 31 except for the 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, in which the die 4 is disposed. In the third station P3, an opening 33 is formed in the steel plate material 30. 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.

The first press section T1 has a pilot pin 14 on one of the first punch unit 5 and the first die unit 6, and a pilot pin hole 15 on the other. In the example shown in FIG. 6, the first punch unit 5 has a pilot pin 14, and the first die unit 6 has a pilot pin hole 15. Although not shown, the first punch unit 5 may have a pilot pin hole 15, and the first die unit 6 may have a pilot pin 14. The pilot pin 14 and the pilot pin hole 15 are arranged at a position 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 each 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.

As shown in Figures 2 and 3, the first punch unit 5 is rotationally driven by the first punch drive unit 8, and the first die unit 6 is rotationally driven by the first die drive unit 9. This may cause a slight phase shift in the circumferential direction between the first punch unit 5 and the first die unit 6. In response to this, the pilot pin 14 is inserted and removed from the pilot pin hole 15, eliminating the phase shift between the first punch unit 5 and the first die unit 6.

In the example shown in Figures 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 they punch out, or after a predetermined number of punches. For example, when the first punch unit 5 and the first die unit 6 rotate by the first angle θ1 each time they punch out, the steel plate material 30 transported downstream has a state in which the slot 36 has a phase difference of the first angle θ1.

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.

The upper side of the first punch side driven pulley 83 is fastened to the first punch upper rotor 81 arranged under the backup plate 80 of the upper die 2, and the lower side is fastened to the first punch holding rotor 82, so that they can rotate together. The first punch upper rotor 81 and the first punch holding rotor 82 can rotate around the first press section center C1 via a radial bearing 58 between them and the upper die 2. In addition, the first punch side driven pulley 83 is supported from below in the vertical direction by a thrust bearing 57 on the lower side facing a part of the upper die 2, so that it can rotate.

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 disposed between the backup plate 84 of the upper die 2 and the 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 first press center C1 between the stripper holder 97 and a thrust bearing 57 and a radial bearing 58.

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 with the movement of the upper die 2. The first punch 5a moves with the movement of the upper die 2, with the punch key plate 96 fixed to the first punch holding rotor 82 engaging with the punch notch portion 5b.

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. The pilot pin 14 and the pilot pin hole 15 may be provided in a pair or multiple pairs.

The first punch side driven pulley 83 and other members move in synchronization with the upper die 2, but when the upper die 2 moves toward the lower die 3, the stripper rotor 90 contacts and presses the steel plate material 30 before the first punch 5a punches out the steel plate material 30. In addition, the first punch side driven pulley 83 and other members and the stripper rotor 90, together with the first punch 5a and the pilot pin 14, all rotate synchronously around the first press center C1. The pilot pin 14 is inserted into the pilot pin hole 15 at an earlier timing than the first punch 5a and the stripper rotor 90 come into contact with the steel plate material 30.

Next, the first die unit 6 will be described with reference to FIG. 6. The first die 6a is fixed to the first die rotor 93, and the first die rotor 93 is rotatably supported by the lower die 3 via a radial bearing 58. The first die side driven pulley 94 is fastened to the underside of the first die rotor 93. The first die side driven pulley 94 is provided with a belt guide 54, and the first die timing belt 71 is hung on it. When the first die driving unit 9 is driven, the first die side driven pulley 94 rotates by the first die timing belt 71, and the first die 6a rotates together with the first die rotor 93. The lower die 3 is provided with a bearing bolt 95, and the first die side 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 part center C1.

<Effects when the first press part T1 is the first embodiment>
The first press section T1 described above has the following effects in the first embodiment. As shown in FIG. 6, the first press section T1 of the laminated steel sheet manufacturing apparatus 1 has a first station P1 equipped with a pilot pin 14 on one of the first punch unit 5 and the first die unit 6, and a pilot pin hole 15 on the other, and is disposed at a position corresponding to the inside of the opening 33 formed in the steel sheet material 30. The pilot pin 14 is inserted into and removed from the pilot pin hole 15 every time the first press section T1 punches out the steel sheet material 30. Therefore, the first punch unit 5 and the first die unit 6 correct the circumferential phase shift every time they punch out the steel sheet material 30, so that it is possible to prevent the accumulation of phase errors. Furthermore, since the pilot pin 14 and the pilot pin hole 15 are formed in a predetermined range including the first press section center C1, the die 4 can be made more compact than when they are formed outside the range in which the steel sheet 31 is formed.

The first press section T1 of the laminated steel sheet manufacturing apparatus 1 is capable of punching out the steel sheet 31 except for its outer shape. As shown in FIG. 13, the slots 36 punched out at the first station P1 can form a shape that is oblique to the stacking direction when the steel sheets are stacked.

As in the example shown in FIG. 13, when the laminated steel plate 32 is used as an armature stator, the windings are wound in the slots 36. Since the slots 36 are oblique to the lamination direction, the windings are also wound obliquely along the slots 36. Therefore, when a stator made of the laminated steel plate 32 is used in combination with a rotor on which a permanent magnet is formed, the rotor can rotate smoothly. Note that, conventionally, the laminated steel plate 300 shown in FIG. 26 has slots 301 and outer peripheral notches 302 shaped along the lamination direction.

<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 the fourth station P4 is combined with the 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.

Of the fourth punch unit 21 and the fourth die unit 22, at least the fourth die unit 22 can rotate around the fourth press center C4, and when punching and forming the steel plate 31, the fourth die unit 22 is rotated in one direction by the second angle θ2 each time one steel plate 31 is punched or a predetermined number of steel plates 31 are punched. At this time, 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 direction or may be opposite directions. When the outer shape of the steel plate 31 is punched and stacked at the fourth station P4, the slot 36 is formed at a skew angle with respect to the stacking direction. The skew angle is determined by the combination of the first angle θ1 and the second angle θ2.

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 plate 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 can rotate 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 plate guide path 133 so that the punched steel plates 31 are stacked.

The fourth rotation drive unit 23 includes a servo motor as the 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 conjunction with the movement of the upper die 2. It also includes a stripper plate 123 fixed to a stripper holder 122.

The fourth die unit 22 is configured such that the fourth die 22a fixed to the fourth die rotor 126 can rotate between the lower die set 25 and the fourth die side driven pulley 130 via a radial bearing 52. The fourth die side driven pulley 130 is fixed to the fourth die rotor 126 and can rotate between the lower die set 25 and the fourth die side driven pulley 130 via a thrust bearing 57. The fourth die timing belt 129 is hung between the fourth die drive pulley 134 and the fourth die side driven pulley 130, and the rotation of the fourth rotation drive source 504 is transmitted to the fourth die side driven pulley 130, causing the fourth die unit 22 to rotate. 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 rotate in synchronization with the fourth die unit 22. In this case, the configuration of the first press section T1 and the configuration of the first rotation drive section 7 of the second embodiment described later may be applied.

<Effects of combining the fourth station P4 with the first station P1 equipped with the first press section T1 of the first embodiment>
When the fourth station P4 is combined with the first station P1 equipped with the first press section T1 of the first embodiment described above, the following effects are achieved. As described with reference to Fig. 1 to Fig. 6 and Fig. 8, the laminated steel sheet manufacturing apparatus 1 can punch out the steel sheet material 30 in the first station P1 so that a shape can be formed in an oblique direction in the lamination direction, and can punch out the outer shape of the steel sheet 31 with rolling in the fourth station P4. Thus, the laminated steel sheet manufacturing apparatus 1 can manufacture a laminated steel sheet 32 in which a slot 36 is formed in a part of the laminated steel sheet 32 in an oblique direction with respect to the lamination direction and in which deviation in the thickness direction is further suppressed, as shown in the example of Fig. 13.

Furthermore, if the shape of the steel plate 31 punched out at the fourth station P4 matches the shape when rotated by the second angle θ2, a laminated steel plate 32 can be formed having notches 34a that are continuous in the stacking direction. As shown in FIG. 13(a), the slots 36 are formed diagonally to the stacking direction, and the outer peripheral notches 34a are formed along the stacking direction. In other words, the laminated steel plate manufacturing apparatus 1 can manufacture a laminated steel plate 32 that has both a shape formed diagonally to the stacking direction and a shape formed along the stacking direction.

When the laminated steel plate 32 is used as a stator for an armature, the notches 34a formed along the lamination direction make it easy to attach to other components. If the outer peripheral notches 34a were formed at an angle to the lamination direction like the slots 36, it could cause problems in attaching it to other components.

<Description of the case where the first press section T1 is the second embodiment>
Next, referring to FIG. 7, the first press section T1 of the second embodiment will be described. The first press section T1 of the second embodiment can punch out the outer shape of the steel plate 31. The first rotary drive section 7 is common to the first embodiment. Referring to FIG. 7, the parts different from FIG. 6 already described will be described. The reference numerals are attached to elements different from FIG. 6. The pilot pin 114 is disposed on the outside of the first punch 105a. Similarly, the pilot pin hole 115 is disposed on the outside of the first die 106a. In the example shown in FIG. 6, the pilot pin hole 15 can be formed because a member is also present on the inside of the first die 6a, but in the example shown in FIG. 7, the steel plate guide path 133 is formed on the inside of the first die 106a, so the pilot pin hole 115 cannot be formed. The first die rotor 193 fixes the first die 106a as in the case of FIG. 6, and rotates integrally with the first die side driven pulley 94. Similarly to the fourth die unit 22, the fourth die unit 23 is provided with a steel plate guide path 133 for stacking the punched steel plates 31.

<Effects when the first press section T1 is the second embodiment>
In the case of the second embodiment, the first press section T1 described above provides the following effects. As shown in Fig. 7, the first station P1 is capable of punching out the outer shape of the steel plate 31. Since the first punch unit 5 and the first die unit 6 are rotated while being rolled, the laminated steel plate 32 can be formed without the steel plate 31 being limited to a point-symmetric shape. Therefore, in addition to the effects of the first rotary drive section 7, the laminated steel plate manufacturing apparatus 1 can manufacture the laminated steel plate 32 with little deviation in the thickness direction without any restrictions on the shape of the steel plate 31.

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

When punching the steel plate material 30, 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 each time the steel plate material 30 is punched, or each time a predetermined number of punches are performed.

As shown in Figures 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, the second punch 16 is in a state where it can punch, and when the push pin 228 is not pressed, the second punch 16 is in a state where it cannot punch.

The punch selection device 17 will be described in detail with reference to Figures 9 to 13. The second station P2 forms the discontinuous notch 34b shown in Figure 13 as an 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.

As shown in FIG. 11, the punch selection device 17 is disposed in the upper die set 24 and is equipped with a punch slide cam 226 that slides by an air cylinder 229 via an operating shaft pin 230. 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, and shows a state in which the second punch 16 can punch the steel plate material 30. FIG. 12(b) shows a state in which the cam recess 226b faces the push pin 228, and shows a state in which the second punch 16 cannot punch the steel plate material 30.

As shown in FIG. 12, the second punch 16 has a punch key groove 16a formed in a portion thereof, and the amount of movement 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 (described later) to determine whether or not the second punch 16 is capable of punching the steel plate material 30.

<Effect of the configuration forming a discontinuous shape in the loading direction>
The above-described configuration for forming a discontinuous shape in the stacking direction has the following effects. 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 selection device 17 can punch the second punch 16 or a state in which the punching cannot be performed every time the steel plate material 30 is punched, or every time a predetermined number of punches are performed. Thus, the laminated steel plate manufacturing apparatus 1 can form a discontinuous shape in the stacking direction of the laminated steel plate 32.

In addition, in the laminated steel plate manufacturing device 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. Therefore, the second punch 16 can be set to 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.

As shown in the example of Figure 13, the punch selection device 17 of the laminated steel plate manufacturing apparatus 1 can manufacture laminated steel plates 32 having notches 34b that are discontinuous in the stacking direction. Without the punch selection device 17, a discontinuous shape in the stacking direction cannot be formed, and post-processing is required. The discontinuous notches 34b in the stacking direction are useful because they can be used for positioning or mounting when assembling to other parts, etc.

<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 die 2 and the lower die 3, and applies an adhesive 41 to the steel plate material 30. In the following description, the adhesive applicator 40 will be described on the assumption that it is mounted on the laminated steel plate manufacturing apparatus 1, but the present invention is not limited to this and can be mounted on any apparatus that applies the adhesive 41 to the steel plate material 30 and manufactures laminated steel plates 32 by stacking punched steel plates 31.

As shown in FIG. 14 etc., the adhesive applying device 40 is provided on at least one of the upper die 2 and the lower die 3, and applies adhesive 41 to the steel plate material 30. The adhesive applying device 40 includes a nozzle unit 42 that applies adhesive 41 to the steel plate material 30, an adhesive reservoir 43 that stores the adhesive 41, and a supply pipe 44 that supplies adhesive 41 from the adhesive reservoir 43 to the nozzle unit 42. The adhesive applying device 40 further includes a nozzle tip 45 formed on the nozzle unit 42 that applies adhesive 41 to the steel plate material 30, and a nozzle spacing adjustment device 47 that can adjust the spacing 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.

The examples shown in Figures 14 to 23 show examples in which the adhesive applicator 40 is disposed on both the upper die 2 and the lower die 3. As shown in Figure 1, the adhesive applicator 40 is disposed on the fifth station P5 upstream of the fourth station P4 where the contour of the steel plate 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 contour is punched out. Note that the adhesive applicator 40 may be disposed on only one of the upper die 2 or the lower die 3.

The overall configuration of the adhesive applicator 40 will be described with reference to Figure 14. The adhesive applicator 40 is arranged on the upper die 2, and has an adhesive reservoir 43 formed in either the upper die set 24 or the upper die 2, and either the lower die set 25 or the lower die 3, and adhesive 41 is supplied to the nozzle unit 42 by a supply pipe 44.

The nozzle unit 42 has a nozzle tip 45 that applies adhesive 41 to the steel plate material 30, and moves as the upper die 2 and the lower die 3 move in the vertical direction. As shown in FIG. 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.

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

21(a) shows the upper die 2 at the top dead center, and shows a state in which adhesive 41 is not being supplied from the adhesive reservoir 43. At this time, the nozzle valve 149 is pushed up to the opposite side of the nozzle tip 45 by the elastic force of the spring 151, and the supply pipe 44 is blocked. FIG. 21(b) shows a state in which the upper die 2 is in the middle of descending toward the lower die 3, and the supply of adhesive 41 from the adhesive reservoir 43 has begun. At this time, the nozzle valve 149 moves toward the nozzle tip 45 against the spring 151 due to the pressure of the adhesive 41, and supplies 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.

As shown in Figures 21 and 22, the nozzle unit 42 provided on 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 on 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 on the lower die 3 moves in conjunction with the movement of the upper die 2 will be omitted.

When the nozzle unit 42 is provided on the upper die 2, as shown in FIG. 22, the stripper plate 140 presses the first surface 30a of the steel sheet material 30 before the nozzle tip 45 exposes the adhesive 41, and maintains a constant distance ag1 between the nozzle tip 45 and the first surface 30a of the steel sheet material 30. The nozzle recess 160 is formed on the stripper plate 140 to protect the nozzle tip 45.

When the nozzle unit 42 is provided in the lower die 3, as shown in FIG. 22, 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, and maintains a constant distance ag2 between the nozzle tip 45 and the second surface 30b of the steel sheet material 30. The nozzle recess 160 is formed in the lower stripper plate 141 to protect the nozzle tip 45.

22(a) shows the state where the upper die 2 has reached the bottom dead center, and shows the state where the adhesive applicator 40 applies adhesive 41 to the steel plate 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 plate material 30, but the nozzle tip 45 is separated from the steel plate material 30 by a gap ag. The adhesive 41 is exposed from the nozzle tip 45 and applied in contact with the steel plate material 30. At this time, the amount of adhesive 41 applied is controlled by the adhesive supply pressure from the adhesive reservoir 43 and the amount of the gap ag. That is, when the amount of adhesive 41 is to be increased, the gap ag is increased to increase the adhesive supply pressure. Conversely, when the amount of adhesive 41 is to be decreased, the gap ag is decreased to decrease the adhesive supply pressure.

Figure 23 shows the state where the upper die 2 returns to the top dead center, and shows the state where 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 to apply the adhesive 41. At this time, the nozzle unit 42 provided on the upper die 2 is separated from the steel plate material 30 by the upper nozzle holding plate 146 that moves with the movement of the upper die 2. The nozzle unit 42 provided on the lower die 3 is separated from the steel plate material 30 by the lower nozzle holding plate 148 that moves in conjunction with the movement of the upper die 2.

Next, the nozzle spacing adjustment device 47 will be described in detail. As shown in Figures 14 to 20, the adhesive application device 40 is equipped with a nozzle spacing adjustment device 47 that adjusts the spacing 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. The nozzle spacing adjustment device 47 is equipped with a spacing adjustment cam 47a and a spacing adjustment block 47b that can be moved in the movement direction of the nozzle unit 42 by the spacing adjustment cam 47a.

As shown in FIG. 14, the nozzle gap adjustment device 47 is adjusted by a rotary adjuster 144. Both the gap adjustment cam 47a and the gap adjustment block 47b have tapered contact surfaces. Using FIG. 15 as an example, the further the gap adjustment cam 47a moves to the right, the further the gap adjustment block 47b moves downward, and the gap ag between the nozzle tip 45 and the steel plate material 30 decreases. FIG. 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. FIG. 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.

As shown in FIG. 14 etc., when the adhesive application device 40 is provided on both the upper die 2 and the lower die 3, the nozzle interval adjustment device 47 is provided independently on the upper die 2 and the lower die 3. The interval ag can be adjusted independently on the upper die 2 and the lower die 3. The first interval ag1 between the first surface 30a of the steel plate material 30 and the nozzle tip 45 is adjusted by the nozzle interval adjustment device 47 provided on the upper die 2, and the second interval ag2 between the second surface 30b of the steel plate material 30 and the nozzle tip 45 is adjusted by the nozzle interval adjustment device 47 provided on the lower die 3.

Next, the nozzle switching device 46 will be described. As shown in FIG. 14 to FIG. 20, the laminated steel sheet manufacturing apparatus 1 is provided with a nozzle switching device 46. The nozzle switching device 46 is arranged between the nozzle interval adjustment device 47 and the nozzle unit 42, and can switch between a state in which the nozzle unit 42 applies adhesive 41 to the steel sheet material 30 and a state in which it does not apply adhesive 41. The nozzle switching device 46 is provided with a switching operation cam 46a, a switching passive cam 46b, and a holding member 143. The switching operation cam 46a moves in a direction perpendicular to the direction in which the nozzle unit 42 moves with the movement of the upper mold 2. The switching passive cam 46b moves along the direction in which the nozzle unit 42 moves with the movement of the upper mold 2 by the operation of the switching operation cam 46a. The holding member 143 holds the switching operation cam 46a and/or the switching passive cam 46b in the direction in which the nozzle unit 42 moves with the movement of the upper mold 2. For example, the switching passive cam 46b is fixed to the nozzle unit 42.

Figures 15 and 18 show the state in which the nozzle unit 42 is close to the steel plate material 30 and can be bonded. The nozzle switching device 46 has a switching actuation cam 46a that moves left and right as shown by an air cylinder 142. The switching actuation cam 46a and the switching passive cam 46b have uneven shapes made of peaks and valleys on their opposing surfaces. Figures 15 and 18 show the state in which the peaks are in contact with each other, and the nozzle tip 45 is close to the steel plate material 30. Figures 16 and 19 show the state in which the valleys of the switching actuation cam 46a and the switching passive cam 46b are opposed to each other, and the nozzle tip 45 is separated from the steel plate material 30.

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

As shown in Figures 15 and 16, when the adhesive applicator 40 is provided on the upper mold 2, the holding member 143a holds the interval adjustment block 47b and the switching operation cam 46a. As a result, when the switching operation cam 46a moves in the left-right direction as shown in the figure, friction between the switching operation cam 46a and the interval adjustment block 47b and between the switching operation cam 46a and the switching passive cam 46b is reduced. If the holding member 143a were not present, the interval adjustment block 47b and the switching operation cam 46a would lower under their own weight and press the switching passive cam 46b. Then, when the nozzle switching device 46 operates the switching operation cam 46a, the peaks and valleys of the switching operation cam 46a and the switching passive cam 46b may collide with each other, preventing the nozzle switching device 46 from operating.

As shown in Figures 18 and 19, when the adhesive applicator 40 is provided on 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 interval adjustment block 47b when the switching operating cam 46a moves in the left-right direction as shown in the figure. If the holding member 143 were not present, the nozzle unit 42 would move down under its own weight and press the switching passive cam 46b. Then, when the nozzle switching device 46 operates the switching operating cam 46a, the peaks and valleys of the switching passive cam 46b may collide with each other, making it impossible to operate.

Next, the killer pin 49 will be described. As shown in FIG. 14 etc., the adhesive application device 40 is equipped with a killer pin 49. The killer pin 49 directly or indirectly contacts 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 plate 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 etc., the killer pin 49 contacts 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 indirectly contacts the killer pin 49.

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

Next, the action of the killer pin 49 will be explained. If the killer pin 49 does not press the switching passive cam 46b, the nozzle unit 42 will tend to move downward due to its own weight. As shown in FIG. 17, there is a possibility that a gap g2 will occur between the switching actuation cam 46a and the spacing adjustment block 47b, and a gap g3 will occur between the switching actuation cam 46a and the switching passive cam 46b.

As shown in FIG. 17, when the killer pin 49 is not in contact with the switching passive cam 46b, the spacing adjustment block 47b, the switching passive cam 46b, and the nozzle unit 42 attempt to descend under their own weight. This may result in a gap g1 between the spacing adjustment block 47b and the switching passive cam 46b, a gap g2 between the switching operating cam 46a and the spacing adjustment block 47b, and a gap g3 between the switching operating cam 46a and the switching passive cam 46b.

In contrast, as shown in Figures 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 Figure 16, when the upper die 2 descends, the gap g3 is eliminated, the nozzle tip 45 and the steel plate material 30 are separated, and the adhesive 41 is not applied.

As shown in Figure 20, if the killer pin 49 does not contact the switching passive cam 46b, the spacing adjustment block 47b will attempt to move down due to its own weight. The switching actuation cam 46a is pushed up by the spring 145 of the holding member 143, so there is a possibility that a gap g4 will occur between the switching actuation cam 46a and the spacing adjustment block 47b. Figure 20 shows a state in which the nozzle holding plate top 146 and the nozzle unit 42 are shifted upward, but there is a possibility that a gap g5 will occur between the switching actuation cam 46a and the switching passive cam 46b. In other words, the gap g5 will cause play in the vertical direction, and the nozzle unit 42, etc. may move up and down due to vibration.

In contrast, as shown in FIG. 19, when the killer pin 49 acts, it presses the switching passive cam 46b, thereby indirectly pressing the nozzle unit 42, and the gap g5 is eliminated. 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 separated from each other, and the adhesive 41 is not applied.

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

Also, as shown in FIG. 14 etc., the adhesive applicator 40 may be provided on the upper die 2 and the lower die 3, sandwiching the steel plate material 30, and when the upper die 2 and the lower die 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 die 2 or the lower die 3.

Also, as shown in FIG. 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 is composed of two types of liquid agents, a main agent 41a and a sub-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 sub-agent 41b.

<Effects of Adhesive Applicator 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 steel plate material 30 and the adhesive applicator 40, and the tip of the exposed adhesive 41 contacts the steel plate material 30. Since the gap ag can be adjusted by the nozzle gap adjustment device 47, it is possible to adjust the amount of adhesive 41 exposed at the gap ag.

This allows the nozzle tip 45 to apply an appropriate amount of adhesive 41 while being spaced apart from the steel plate material 30. The adhesive 41 has different viscosity, adhesive strength, and other properties depending on the type used. If the gap ag is constant, the types of adhesive 41 that can be used are limited, and the degree of freedom in selecting the adhesive 41 is lost. In contrast, the adhesive application device 40 can adjust the gap ag according to the properties of the adhesive 41 used, so that the selection range of adhesive 41 can be widened and the adhesive strength can be improved. In addition, the adhesive application device 40 can adjust the pressure of the adhesive 41 supplied from the adhesive reservoir 43 to further finely adjust the amount of adhesive 41 applied. In addition, since the nozzle tip 45 has a gap ag between it and the steel plate material 30, it is possible to prevent the steel plate material 30 from coming into contact with and being damaged.

As shown in FIG. 14, when the adhesive application device 40 is provided on both the upper die 2 and the lower die 3, the distance ag can be adjusted independently for the upper die 2 and the lower die 3. That is, 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 of the steel plate material 30 can be adjusted in different states. Therefore, it is possible to use an adhesive 41 having different characteristics of the appropriate distance ag for the first surface 30a and the second surface 30b of the steel plate material 30. Alternatively, it is possible to set the first distance ag1 and the second distance ag2 to be different, and to apply different amounts of adhesive 41 to the first surface 30a and the second surface 30b. In the example shown in FIG. 21, the first surface 30a is the upper surface of the steel plate material 30, and the second surface 30b is the lower surface.

Next, the effects of the detailed configuration of the nozzle spacing adjustment device 47 will be described. As shown in FIG. 14 etc., the nozzle spacing adjustment device 47 of the adhesive application device 40 can adjust the spacing ag between the nozzle unit 42 and the steel plate material 30 by operating the spacing adjustment cam 47a to move the spacing adjustment block 47b.

Next, the effect of the nozzle switching device 46 will be described. As shown in FIG. 14 to FIG. 20, the laminated steel plate manufacturing apparatus 1 can use the nozzle switching device 46 to switch between a state in which the nozzle unit 42 applies adhesive 41 and a state in which it does not. Therefore, it is possible to set whether or not to bond each time the steel plate material 30 is punched out, or for each predetermined number of sheets. For example, when a set number of steel plates 31 are stacked, the nozzle switching device 46 can stop applying adhesive 41. In addition, the holding member 143 holds the switching operating 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 operating cam 46a moves smoothly relative to the switching passive cam 46b.

Next, the effect of the killer pin 49 will be described. As shown in FIG. 14 etc., 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 integral with the nozzle unit 42 contacts the switching operating cam 46a, and the switching operating cam 46a maintains a state of contact with the nozzle interval adjustment device 47. Therefore, the adhesive applicator 40 is prevented from rattling even when the upper die 2 moves at high speed. Also, as shown in FIG. 17 and FIG. 20, when the switching operating cam 46a operates to put the adhesive 41 in a non-applied state, the interval ag between the nozzle tip 45 and the steel plate material 30 is maintained constant.

When the adhesive applicator 40 is provided on both the upper die 2 and the lower die 3, the adhesive 41 is applied to the first surface 30a and the second surface 30b of the steel plate 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. It is also possible to separate the process of applying the adhesive 41 to the first surface 30a and the second surface 30b into separate processes rather than performing the processes simultaneously.

Furthermore, the adhesive 41 of either the upper mold 2 or 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 adhesive 41 may be applied to the opposing positions of the upper and lower surfaces of the steel plate material 30. In this case, when the steel plates 31 are stacked, the main agent 41a and the secondary agent 41b come into contact and undergo a hardening reaction to bond them together. Therefore, the laminated steel plate manufacturing apparatus 1 can prevent the adhesive 41 from drying or hardening before the steel plates 31 are stacked, thereby reducing its adhesive ability.

<Explanation of the control device 500>
Next, a control device 500 that controls each element of the laminated steel sheet manufacturing apparatus 1 of the present invention will be described with reference to Fig. 25. The control device 500 receives instructions for each element from an input device 501. The input device 501 is a device for inputting the start and stop of the punching operation of the steel sheet 31 as well as the number of punched sheets that determines how many sheets of the steel sheet material 30 are punched at each of the first and fourth stations P1 and P4 by rotating the first and fourth press sections T1 and T4. 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.

The information input to the input device 501 is received by the input/output interface 511, and the CPU 512 performs each process. The CPU 512 performs first rotation drive source drive process by the first control device 515, fourth rotation drive source drive process by the fourth control device 516, transport drive circuit drive process by the transport control device 521 that transports the steel plate material 30, die lift drive process that lifts and lowers the upper die 2 by the die lift control device 517, and punch selection drive process by the punch control device 520. The ROM 513 and RAM 514 perform information storage processes for these processes.

Next, the CPU 512 provides each of the processed drive information to each drive circuit from the input/output interface 511. When driving the first rotation drive source 502, the CPU 512 provides drive information to the first rotation drive circuit 503 to drive it. When driving the fourth rotation drive source 504, the CPU 512 provides drive information to the fourth rotation drive circuit 505 to drive it. When driving the transport drive source 507 that transports the steel plate material 30, the CPU 512 provides drive information to the transport 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.

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

2, 3 and 25, the first rotary drive unit 7 includes a first rotary drive source 502 for rotating the first punch unit 5 and the first die unit 6, and a first control device 515 for controlling the first rotary drive source 502. The first laminated steel sheet manufacturing method includes the following steps. The method includes a first step S11 in which the upper die 2 and the lower die 3 are moved relatively to each other by the die lift control device 517, thereby moving the first punch unit 5 and the first die unit 6 relatively to each other to punch out the steel sheet material 30. After the first step S11, the method includes a second step S12 in which the first control device 515 rotates the first rotary drive source 502 each time or for a predetermined number of times to rotate the first punch unit 5 and the first die unit 6 in one direction by a first angle θ1. After the second step S12, the method includes a third step S13 in which a predetermined amount of the steel sheet material 30 is conveyed. Furthermore, after the third step S13, the method includes a fourth step S14 in which the outer shape of the steel sheet 31 is punched out and the steel sheets 31 are laminated.

After the second step S12 and the third step S13, the first processing portion 35 formed at the first station P1 has a phase difference of a first angle θ1 with respect to the first processing portion center Ch1 between the first processing portions 35 adjacent in the conveying direction. When the steel plates 31 are stacked in the fourth step S14, the first processing portion 35 forms a shape skewed with respect to the stacking direction. The first processing portion 35 is a slot 36 as shown in the example of FIG. 13(a). The laminated steel plate 32 in which the steel plates 31 are stacked forms a shape in which the slot 36 is skewed with respect to the stacking direction. When the outer shape is formed in the fourth step S14, the outer peripheral shape is formed along the stacking direction, as shown in the notches 34a in FIG. 13(a) and (c). That is, the slot 36 is skewed, and the outer peripheral notches 34a are formed along the stacking direction.

<Effects of the first laminated steel sheet manufacturing method>
According to the first laminated steel sheet manufacturing method described above, the following effects are achieved. As shown in FIG. 1 to FIG. 6, the first processed portion 35 formed at the first station P1 forms a phase difference of a first angle θ1 with respect to the first processed portion center Ch1 between the first processed portions 35 adjacent in the conveying direction after passing through the second step S12 and the third step S13. When the steel sheets 31 are laminated in the fourth step S14, the first processed portion 35 can be formed in a state skewed with respect to the lamination direction. Therefore, a shape skewed with respect to the lamination direction can be formed without performing post-processing. Furthermore, a shape along the lamination direction can be formed in the fourth step S14. Therefore, as exemplified in FIG. 13(a), a slot 36 skewed with respect to the lamination direction can be formed. Furthermore, the notch 34a on the outer periphery can be formed in a shape along the lamination direction. The effect of applying the laminated steel sheet 32 manufactured by the first laminated steel sheet manufacturing method to the stator of an armature has already been described.

<Description 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 lamination 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 punchable state by the punch selection device 17 described with reference to Figs. 9 to 12 and punches a second shape portion 34 that is a part of the shape of the steel sheet 31, and a second step S22 in which the second punch 16 is set to an unpunchable state by the punch selection device 17 and punching of the second shape portion 34 is stopped.

Furthermore, after the first step S21 or the second step S22, a third step S23 is performed in which a predetermined amount of steel plate material 30 is conveyed, and after the third step S23, a fourth step S24 is performed in which the outer shape of steel plate 31 is punched out and steel plate 31 is laminated. 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 lamination direction. As in the example shown in Figures 13(a) and (c), a discontinuous notch 34b is formed on the outer periphery of laminated steel plate 32.

<Effects of the second laminated steel sheet manufacturing method>
The second laminated steel sheet manufacturing method described above has the following effects. 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 making the second punch 16 in a punchable state, and a second step S22 of stopping punching the second shaped portion 34 by making the second punch 16 in a non-punchable state. Thus, a laminated steel sheet 32 having a discontinuous shape in the lamination direction can be formed without performing post-processing. As illustrated in Fig. 13, the second laminated steel sheet manufacturing method can form a notch 34b that is discontinuous in the lamination direction in the laminated steel sheet 32. The effects of the laminated steel sheet 32 having a notch 34b that is discontinuous in the lamination direction manufactured by the second laminated steel sheet manufacturing method have already been described.

<Description 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 is a manufacturing method in which a skewed shape is formed in a part of the laminated steel sheet 32 by using the laminated steel sheet manufacturing apparatus 1 already described, and a lamination 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 first step S31 is provided in which the upper die 2 and the lower die 3 are moved relatively to each other, thereby moving the first punch unit 5 and the first die unit 6 relatively to each other to punch out a part of the steel sheet 31 from the steel sheet material 30. After the first step S31, the second step S32 is provided 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.

Furthermore, after the second step S32, a third step S33 is provided in which the steel plate material 30 is transported to a fourth station P4. After the third step S33, a fourth step S34 is provided in which the upper die 2 and the lower die 3 are moved relatively to each other to move the fourth punch unit 21 and the fourth die unit 22 relatively to each other, punching out the outer shape of the steel plate 31 partially formed at the first station P1, and stacking the steel plates 31. A fifth step S35 is provided in which the fourth die unit 22 is rotated in one direction by a second angle θ2 each time one steel plate 31 is punched out or a predetermined number of steel plates 31 are punched out.

<Effects of the third laminated steel sheet manufacturing method>
The third laminated steel sheet manufacturing method described above has the following effects. In the third laminated steel sheet manufacturing method, the first processed parts 35 formed at the first station P1 have a phase difference of a first angle θ1 with respect to the first processed part center Ch1 between the first processed parts 35 adjacent in the conveying 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 parts 35 can be formed in a state skewed with respect to the stacking direction, and further, a laminated steel sheet 32 with reduced deviation in the thickness direction can be manufactured.

Furthermore, if the shape of the steel plate 31 punched out in the fourth step S34 matches the shape when rotated by the second angle θ2, the laminated steel plate 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 diagonally with respect to the stacking direction, and the notches 34a on the periphery are formed along the stacking direction. In other words, the third laminated steel plate manufacturing method can manufacture a laminated steel plate 32 that has both a shape formed diagonally with respect to the stacking direction and a shape formed along the stacking direction.

In addition, if the shape punched out in the fourth step S34 includes a shape that matches when rotated through 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.

<Description 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 a laminated steel sheet 32 by performing 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 die 2 and the lower die 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 sheet 31 and laminate the steel sheet 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.

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

<<Explanation of steel plate bonding method and its effects>>
Next, a first steel plate bonding method according to a second aspect 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 is performed in which the nozzle gap adjustment device 47 of the adhesive applicator 40 described with reference to Figs. 14 to 22 is used to adjust the gap ag between the steel plate material 30 and the nozzle tip 45 when the nozzle tip 45 is closest to the steel plate material 30. After the first step S51, a second step S52 is performed in which the adhesive 41 is applied to the steel plate material 30. After the second step S52, a third step S53 is performed in which the punched steel plates 31 are laminated and bonded.

The first steel plate bonding method described above has the following effects. 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 laminate and bond steel plates 31 to which an appropriate amount of adhesive 41 has been applied.

Next, the 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 application device 40 already described, and includes the following steps. A first step S61 in which a first gap 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 is adjusted by a nozzle gap adjustment device 47 provided on the upper die 2. A second step S62 in which a second gap 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 is adjusted by a nozzle gap adjustment device 47 provided on the lower die 3. After the first step S61 and the second step S62, a third step S63 is performed in which adhesive 41 is applied to the steel plate material 30. After the third step S63, a fourth step S64 is performed in which steel plates 31 with punched-out outlines are laminated and bonded.

The second steel plate bonding method described above has the following effects. The adhesive 41 is 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. Thus, an appropriate amount of adhesive 41 can be applied to each of the first surface 30a and the second surface 30b, and the steel plate 31 can be laminated and bonded.

Next, the third steel plate bonding method will be described. The third steel plate bonding method is a method of manufacturing a laminated steel plate 32 by bonding steel plates 31 using the adhesive application device 40 already described, and includes the following steps. A first step S71 in which a first gap 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 is adjusted by a nozzle gap adjustment device 47 provided on the upper mold 2. A second step S72 in which a second gap 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 is adjusted by a nozzle gap adjustment device 47 provided on the lower mold 3. After the first step S71 and the second step S72, a third step S73 in which a main agent 41a is applied to the first surface 30a by the adhesive application device 40, and a fourth step S74 in which a secondary agent 41b is applied to the second surface 30b corresponding to the position where the main agent 41a is applied. After the third step S73 and the fourth step S74, a fifth step S75 is performed in which the steel plates 31 with the punched outline are laminated and bonded together.

The third steel plate bonding method described above has the following effects. 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 suitable for the main agent 41a to be applied to the first surface 30a and the second distance ag2 suitable for the auxiliary 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 auxiliary agent 41b can be applied to the second surface 30b, and the steel plates 31 can be laminated and bonded.

2 Upper mold 3 Lower mold 4 Mold 30 Steel plate material 30a First surface 30b Second surface 31 Steel plate 32 Laminated steel plate 40 Adhesive application device 41 Adhesive 41a Main agent 41b Sub-agent 42 Nozzle unit 43 Adhesive storage section 44 Supply pipe 45 Nozzle tip 46 Nozzle switching device 46a Switching actuating cam 46b Switching passive cam 47 Nozzle interval adjustment device 47a Interval adjustment cam 47b Interval adjustment block 49 Killer pins 143, 143a, 143b Holding member S51, S61, S71 First step S52, S62, S72 Second step S63, S73 Third step S74 Fourth step S75 Fifth step ag1 First interval ag2 Second interval

Claims (8)

An adhesive applying device that is incorporated in a manufacturing device for manufacturing laminated steel plates, the device including a pair of upper and lower dies that are movable relative to one another along a vertical direction in order to punch out a steel plate material, and stacking steel plates that are punched out into a predetermined shape from the steel plate material,
At least one of the upper mold and the lower mold is provided with
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;
a killer pin that directly or indirectly contacts 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 nozzle unit is maintained in direct or indirect contact with the nozzle spacing adjustment device . The nozzle interval adjustment device is
A spacing adjustment cam;
2. The adhesive applicator according to claim 1, further comprising a gap adjustment block that is contactable with the gap adjustment cam and is movable in the movement direction of the nozzle unit by the gap adjustment cam. 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, and a 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 movable along a direction in which the nozzle unit moves in association with the movement of the upper die by the operation of the switching operating cam,
The adhesive applying device according to claim 1 , wherein the holding member holds 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 die. The steel plate material is sandwiched between the upper die and the lower die,
When the upper mold and the lower mold move in a direction toward each other,
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. The adhesive is made of two types of liquid agents, a main agent and a sub-agent,
5. The adhesive applying apparatus according to claim 4 , 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. A method for laminating and bonding steel sheets by using the adhesive applying apparatus according to any one of claims 1 to 5 , comprising the steps of:
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 adjustment device;
After the first step, a second step of applying the adhesive to the steel plate material;
The steel plate bonding method further comprises a third step of laminating and bonding the punched steel plates after the second step. A method for laminating and bonding steel sheets using the adhesive applying apparatus according to claim 4 , comprising the steps of:
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 a fourth step of laminating and bonding the steel plates having the punched outer shape after the third step. A method for laminating and bonding steel sheets using the adhesive applying apparatus according to claim 5 , comprising the steps of:
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 having the punched outline after the fourth step.

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