JP2526912B2 - Fixing method of metal ribbon core - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of fixing a tip end portion of a wound magnetic core formed by winding a foil-shaped metal ribbon of an amorphous alloy or the like.

[Prior Art] An amorphous alloy is used, for example, as a core in a power transformer. For this purpose, a ribbon formed by forming the amorphous alloy into a thin foil is used, and the ribbon is wound by a predetermined amount. This forms a wound magnetic core.
In order to form such a winding core, a winding shaft driven to rotate by a motor is used, the tip of a ribbon supplied from a reel or the like is wound around the winding shaft, and then the motor is driven to rotate. The one in which a ribbon is wound around the winding shaft has been conventionally used.

Thus, in the above-mentioned conventional technique, the tip of the ribbon is wound around the winding shaft, and the motor is rotationally driven to feed the ribbon out of the reel, and when a predetermined amount of winding is completed, Stop the operation of the motor,
The end of the ribbon is fixed by spot welding, and the wound magnetic core thus formed is detached from the winding shaft by using an appropriate jig, and spot welding is performed from the inside. The tip was fixed.

By the way, if the end portion of the wound magnetic core is fixed by the spot welding means, the spot welding portion becomes high in heat and crystallizes, which is not preferable from the viewpoint of characteristics in the product. Fixing by means not only has the advantage that the winding core can be fixed very reliably, but also because the winding core is heat treated after it is formed. Since a fixing agent or other fixing means cannot be used, a method of fixing the end of the wound magnetic core by such spot welding is used.

[Problems to be Solved by the Invention] As described above, even if spot welding is used to fix the ends of the winding magnetic core, the spot welding is intended to prevent changes in characteristics of the winding magnetic core as much as possible. In particular, it is preferable to reduce the heating area by this spot welding. Here, the spot diameter in the spot welding can be set to the minimum necessary for fixing the spot diameter depending on the structure of the electrode in the welding apparatus, but as in the above-described conventional technique, the welding of both ends of the winding core is performed. If the heating is performed both inside and outside the winding core, there is a drawback that the heating region is expanded more than necessary in the thickness direction of the winding core. Further, it is difficult to perform spot welding for fixing the tip of the ribbon from the inside of the winding core by using an automatic welding device, and such work is usually performed manually. For this reason, there is also a disadvantage that the whole process of forming the wound magnetic core cannot be automated.

The present invention has been made in view of the above points, and an object of the present invention is to easily fix an end portion of a wound magnetic core by spot welding from the outer side of a ribbon and reduce a heating area. It is an object of the present invention to provide a fixing method of a metal ribbon winding core that can be performed.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a winding shaft for winding a foil-shaped metal ribbon and an end portion of the ribbon wound around the outer winding shaft. Spot welding means for fixing, and when the ribbon is wound around the winding shaft a plurality of times, by welding from the outer peripheral side of the ribbon by the spot welding means, the tip of the ribbon The feature is that it is fixed.

[Operation] First, the front end of the ribbon is wound around the winding shaft, and the winding shaft is rotationally driven to wind the ribbon around the winding shaft. Then, when the ribbon is wound around the winding shaft a predetermined number of times, the winding shaft is stopped from rotating and the spot winding means welds the ribbon wound around the winding shaft from the outer peripheral side thereof. Here, since this welding is performed to fix the tip of the ribbon, the tip of the ribbon is surely controlled by strictly controlling the feeding amount by the ribbon feeding means for feeding the ribbon to the winding shaft. It becomes possible to perform welding at the position of the part.

Thus, the spot welding at the tip of the ribbon is not only for fixing the tip of the ribbon when the winding core is formed, but also for winding the ribbon around the winding shaft. In order to hold the ribbon so that it will not be displaced or come off, it is preferable to wind the ribbon around the winding shaft about 4 to 6 times. By performing spot welding in a state where the ribbon is wound a minimum number of times as described above, the heating area of the ribbon can be reduced.

In addition, since this spot welding is performed from the outside of the ribbon in a state where it is wound around the winding shaft by a predetermined amount, this work can be performed using an automatic welding device, and the work can be automated. You will be able to plan.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows the overall structure of the wound magnetic core forming apparatus. In the figure, reference numeral 1 denotes a ribbon made of an amorphous alloy as a metal ribbon, and the ribbon 1 is sent out from a state wound on a reel 2 and then sent to an adjusting unit 4 via an extra length portion 3. Has been done.

Here, as shown in FIGS. 2 and 3, the adjustment unit 4 has a tension roller 5, and a pressing roller 6 is pressed against the tension roller 5 by the urging force of a spring 7. A friction brake 8 is connected to the tension roller 5 so that a predetermined tension can be generated on the ribbon 1 wound around the tension roller 5 by the braking force of the friction brake 8. Has become. Further, the rotation angle of the tension roller 5 is transmitted to the rotation detecting section 10 via the pressing roller 6 and the timing belt 9 which are pressed against the tension roller 5, and detected by the encoder 11 mounted on the rotation detecting section 10. The feeding amount of the ribbon 1 can be measured based on the signal from the encoder 11.

The ribbon 1 given a predetermined tension in the adjusting unit 4 is sent to the ribbon feeding unit 12. Here, as shown in FIG. 4 and FIG. 5, the ribbon feeding unit 12 has a pair of guide rollers 13 and 14 provided with a dancer roller 15 between the front and rear, and the dancer roller 15 is pressed against the ribbon 1 by a spring 16. As a result, the spring force of the spring 16 and the dancer roller 15
The weight of the ribbon 1 is configured to exert a tensile force on the front end side of the ribbon 1. Then, at a position in front of the guide roller 14, a pair of guide rollers 17, 1
8 is mounted on a horizontal moving block 19, and a fixed chuck plate 20 and a movable chuck plate for chucking the ribbon 1 are attached to these guide rollers 17, 18 in the horizontal moving block 19.
Ribbon chuck means consisting of 21 is mounted. The movable chuck plate 21 in the ribbon chuck means is urged by a spring 23 attached to the elevating plate 22 in a direction projecting from the spring 23. By moving the elevating plate 22 up and down by a solenoid 24, the movable chuck plate 21 is fixed. It is configured to come into contact with and separate from the chuck plate 20.

Further, the horizontally moving block 19 is adapted to be reciprocally moved in the horizontal direction by a cylinder 25, and the ribbon 1 can be sent to the winding section 26 by the action of the ribbon chuck means mounted on the horizontally moving block 19. You can do it. A guide portion 28 for winding the tip of the ribbon 1 around the winding shaft 27 of the winding portion 26 is provided at the tip of the horizontally moving block 19.

The winding shaft 27 of the winding unit 26 has a motor (not shown) for rotating the winding shaft 27 as shown in FIGS. 6 to 9.
Has a gear 27b that meshes with a gear 29a mounted with an intermediate shaft 29 connected by a belt transmission means, and by rotating this motor, the winding shaft 27 can be rotationally driven via the intermediate shaft 29. It is like this. A pair of guide plates 30 and 30 are provided on the winding shaft 27 so as to hold them from the left and right, and each of the guide plates 30 is displaced in a direction of approaching and separating from the winding shaft 27. Is able to. A recess 30a is formed at a position of the guide plate 30 facing the winding shaft 27, and when the guide plate 30 is close to the winding shaft 27, the recess 30a and the winding shaft 27 are formed.
A gap for winding the ribbon 1 is formed between the outer peripheral surface and the outer peripheral surface.

Further, a tubular body 31 is provided so as to surround the winding shaft 27, and a tip end surface 31a of the tubular body 31 is formed to have a diameter larger than the winding diameter of the ribbon 1 around the winding shaft 27. And the winding shaft
When wound around 27 to form a wound magnetic core, the cylinder 32 can be moved by sliding the cylinder 32, and the wound magnetic core can be attached to and detached from the winding shaft 27. There is. At the tip of the winding shaft 27, a winding deviation preventing member 33 for guiding the ribbon 1 toward the winding shaft 27 and holding the ribbon 1 so that the ribbon 1 is not wound is wound by the cylinder 34. It is provided so as to be able to come into contact with and separate from the shaft 27.

Thus, the ribbon 1 is wound around the winding shaft 27 as described above, and spot welding means is used to fix the ribbon 1 wound around the winding shaft 27. This spot welding means has the structure shown in FIGS. 10 and 11.

That is, 40 is shown on the base, and a guide rod 41 is provided on the base 40.
Are connected, and the guide rod 41 is supported by a pedestal 42 so as to be able to move up and down. A connecting rod 42 is connected to the base 40, and the other end of the connecting rod 43 has a lever 45 movable about a shaft 44.
It is connected to. A cam follower 46 is attached to an intermediate portion of the lever 45, and a rotation shaft 47 rotates about its center. By engaging a cam plate 48 with the cam follower 46, the lever 45 is rotated about the shaft 44. The base 40 can be moved up and down by the. Then, attach the lever 45 to the cam follower attached to it.
A spring 49 is applied to the lever 45 so that the lever 46 always biases the cam plate 48.

An elevating block 50 is mounted on the base 40, and the elevating block 50 is a guide rod mounted on the base 40 so as to be vertically movable.
It is detachably fixed to the tip of 51 with screws 52. The lifting block 50 is provided with a pair of insertion holes 53, 53 penetrating in the lifting direction, and the insertion holes 53, 53 are formed.
Electrodes 54, 54 for spot welding are inserted through the. These electrodes 54, 54 are sandwiched by a supporting block 55 provided below the elevating block 50, and the supporting block 55 is attached to a guide rod 56 mounted on the base 40 so as to be vertically movable. Here, the fixing of the electrodes 54, 54 on the support block 55 is performed by using the screw 57 screwed into the support block 55, but it is possible to strictly adjust the height position of the electrodes 54, 54. As a simple holding function for this, a steel ball 58 and a spring 59 for pressing the steel ball 58 to the electrodes 54, 54 are attached to the support block 55.

Furthermore, these lifting blocks 50 and support blocks 55
, And springs 60, 61 are contracted between the base 40 and
The springs 60 and 61 urge the blocks 50 and 55 to move upward. And these springs 60,61
When it is in a free state, the electrodes 54, 54 supported by the support block 55 are retained in a state of being immersed in the insertion holes 53, 53 in the elevating block 50. In addition, when the base 40 is raised, the lifting block 50
Of the electrode 5 supported by the support block 55 when the front end surface 50a of the is contacted with the ribbon 1 attached to the winding shaft 27.
4, 54 are moved up relative to the elevating block 50, pressed against the ribbon 1 by the force of the spring 61 acting on the supporting block 55, and an electric current is applied between the electrodes 54, 54. The ribbon 1 wound around the winding shaft 27 can be spot-welded.

This embodiment is configured as described above, and its operation will be described next.

First, the ribbon 1 of the reel 2 is fixed to the fixed chuck through the extra length portion 3 thereof, between the tension roller 5 and the pressing roller 6 of the adjusting unit 4, and the guide roller 13, the dancer roller 15, and the guide rollers 14, 17, and 18. The ribbon 1 is guided between the plate 20 and the movable chuck plate 21, the tip of the ribbon 1 is sent out to a fixed position, and the movable chuck plate 21 is displaced in the direction of being pressed against the fixed chuck plate 20. Make a chuck. On the other hand, the guide plates 30, 30 are brought close to the winding shaft 27, and the winding shaft 27 is
The winding deviation preventing member 33 is displaced to an operating position facing the winding shaft 27 while being surrounded by a predetermined distance from the outer peripheral surface thereof.

Therefore, by displacing the horizontal movement block 19 in the direction shown by the arrow in FIG.
The ribbon 1 is inserted between the guide 27 and the guide portion 30, and the winding shaft 27 is rotated to wind the ribbon 1. Where this winding shaft
The winding of the ribbon 1 by the 27 is performed at a low speed, and the winding shaft 27
The winding of the winding shaft 27 is stopped in a state of being wound about 4 to 6 times, and spot welding is performed from the outside of the ribbon 1.

To perform this spot welding, the cam plate 48 is rotated, and the lever 45 is rotated about the shaft 44 to raise the base 40 connected to the lever 45 via the connecting rod 43, First lift block 50
The front end surface 50a of the tape is brought into contact with the ribbon 1. And
When the base 40 is further lifted from this state, the elevating block 50 is displaced in the direction of approaching the base 40. As a result, the electrodes 54, 54 supported by the support block 55 are relatively displaced with respect to the elevating block 50, and the ribbon 1 passes through the insertion holes 53, 53.
To come into contact with the position. After this, when the base 40 is still raised, the support block 5 supporting the electrodes 54, 54
5 is displaced toward the base 40 side against the spring 61 acting on it, and the spring force due to the bending of the spring 61 acts on the electrodes 54, 54 to cause each electrode 54 to exert a predetermined force on the ribbon 1. It will be possible to press. As described above, when the electrode 54 is pressed against the ribbon 1 and current is applied between the electrodes 54, 54, spot welding can be performed from the outside of the ribbon 1 by the arc generated between the electrodes 54, 54. It becomes possible to fix the tip of 1.

By performing spot welding for fixing the tip of the ribbon 1 in a state where the ribbon 1 is wound 4 to 6 times, the heating area of the ribbon 1 by welding is reduced. It becomes possible to prevent deterioration of the magnetic characteristics. Further, by performing spot welding in a state of being wound about 4 to 6 times as described above, there is no possibility of inconvenience such that the spot welded portion is separated after the wound magnetic core is formed. Moreover, since the spot welding for fixing the tip of the ribbon 1 is performed from the outside of the ribbon 1, the spot welding can be easily performed and the work can be automated.

By the way, as described above, when welding the tip of the ribbon 1, the position of the tip of the ribbon 1 is detected, and the take-up shaft 27 is securely placed at the spot welding position. The rotation of the must be stopped. However, since the end of the ribbon 1 is wound around the winding shaft 27 by moving the horizontal moving block 19, slips or the like occur when the winding shaft 27 is rotated to wind the ribbon 1. Even if the winding shaft 27 is rotated a predetermined number of times and the ribbon 1 is wound and then stopped at a fixed position, the position of the tip of the ribbon 1 is not always the same. However, the feeding amount of the ribbon 1 can be detected by the rotation amount of the tension roller 5, and the rotation detector 10 is attached to the tension roller 5, so that the ribbon by the winding shaft 27 can be detected. The winding amount of 1 can be accurately detected. Therefore, based on the signal from the rotation detector 10, the winding shaft 27
By stopping the operation, it becomes possible to surely stop at the position where spot welding is performed at the tip position of the ribbon 1, so that the end portion of the ribbon 1 can be fixed accurately.

After spot welding of the tip end portion of the ribbon 1 as described above, the base 40 is lowered by the action of the cam mechanism to separate the raising / lowering block 50 and the electrodes 54, 54 from the ribbon 1, and the winding shaft. By rotating 27 at a high speed, the ribbon 1 is wound around the winding shaft 27 so as to have a predetermined winding diameter, and the second spot welding is performed in the same manner as described above. After that, a ribbon (1) is cut by a cutter (not shown), and further, the cut back end portion is taken up by a winding shaft.
The winding core can be formed by winding the wire around 27 and performing the third spot welding. Therefore, take-up shaft 27
By moving in the direction indicated by the arrow in the figure, the winding core can be detached from the winding shaft 27.

[Effects of the Invention] As described in detail above, according to the present invention, when the ribbon is wound around the winding shaft a plurality of times, the tip portion of the ribbon is fixed by welding with the spot welding means. Since it is configured, the heating area for the ribbon can be reduced, and moreover, it can be securely fixed,
Since this spot welding is performed from the outer peripheral surface side of the ribbon, this work can be easily performed, and various effects such as automation of the work can be achieved.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an overall configuration diagram of a winding core forming device, FIG. 2 is an explanatory diagram of a configuration of an adjusting unit, FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a structural explanatory view of a ribbon feeding section, FIG. 5 is a partial sectional plan view of FIG. 4, FIG. 6 is a structural explanatory view of a winding shaft, and FIG. 7 is a partial sectional plan view of FIG. 8 is a perspective view of the winding shaft, FIG. 9 is an exploded perspective view of FIG. 8, FIG.
The figure is a tenth XI-XI sectional view. 1: Ribbon, 4: Adjustment ribbon, 10: Rotation detector, 12: Ribbon feeding part, 26: Winding part, 27: Winding shaft, 30: Guide plate, 40: Base,
50: Lift block, 54: Electrode, 55: Support block.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akira Kikushima 2-6-2 Otemachi, Chiyoda-ku, Tokyo Inside Hitachi Electronics Engineering Co., Ltd. (72) Inventor Yamataka ▲ Akira ▼ 5200, Mikkaji, Kumagaya, Saitama Hitachi Metals Co., Ltd. Magnetic Materials Research Center

Claims (1)

(57) [Claims] 1. A winding shaft for winding a foil-shaped metal ribbon, and spot welding means for fixing an end portion of the ribbon wound around the winding shaft. When the ribbon is wound a plurality of times, the tip of the ribbon is fixed by welding from the outer peripheral surface side of the ribbon by the spot welding means. method.