JPS6314413A - Manufacture of inductor - Google Patents

Abstract

PURPOSE:To enhance the productivity of the title inductor by a method wherein a bonding agent having an ultraviolet ray hardening property and an anaerobic hardenability is coated on the lead wire located in the vicinity of the prescribed position successively, a magnetic core is pushed into the prescribed position of the lead wire, the bonding agent is hardened by projecting ultraviolet rays on the bonding agent, and the fixing of the lead wires of the magnetic core is performed continuously. CONSTITUTION:The bonding agent 16 having an ultraviolet ray hardenability and an anaerobic hardenability is coated successively on the lead wires 4 located at least in the vicinity of the prescribed position of the magnetic core 5 of parts 2a while a plurality of the parts 2a, which are in the state wherein a magnetic core 5 is passed through to the point located before the prescribed position, are being fed successively to an almost U-shaped lead wire 4. Then, the magnetic core 5 of each part 2a is pushed in successively to the prescribed position of the lead wire 4, and the bonding agent 16 on each part 2a is hardened by projecting the ultraviolet rays 20 thereon. For example, a tape 12 on which a plurality of parts 2a are attached is fed continuously as shown by the arrow A in the diagram, a roller 18 is arranged in the midway of the tape 12, and the bonding agent 16 is coated on the lead wires 4 successively. Consequently, as the magnetic core can be fixed to the lead wire continuously, the productivity of the title inductor can be increased, and the cost of manufacture can also be cut down.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an inductor in which a magnetic core is passed through and fixed to a substantially U-shaped lead wire.

[Conventional technology]

FIG. 3 is a schematic diagram showing an example of an inductor.

The inductor 2 shown in (A) is an example in which a magnetic core (for example, ferrite beads) 5 is passed through both legs of a substantially U-shaped lead wire 4 and fixed, and the inductor 3 shown in CB) is fixed as described above. This is an example in which a magnetic core 5 is passed through and fixed to one of the legs of a lead wire 4 similar to the above, and both are called radial types.

In manufacturing the implant 2.3 as described above, the magnetic core 5 has conventionally been fixed to the adhesive vA4 by applying a thermosetting adhesive in a so-called batch type dipping.

This will be explained using the inductor 2 as an example with reference to FIG. 4. First, in the first step, the magnetic core 5 is passed through the lead wire 4 to prepare a plurality of parts 2a before being fixed. Then, insert a plurality of these into a jig 8, and in the third step, use such a jig 8 to immerse each magnetic core 5 part in a thermosetting adhesive 10 to apply the adhesive. (FIG. 4 shows this state), in the fourth step, the applied adhesive was cured by heating in an electric furnace or the like to obtain a plurality of inductors 2 as described above.

[Problem that the invention seeks to solve]

However, in such a conventional method, it is necessary to pool a certain number of parts 2a as described above before the process such as applying the adhesive described above, which causes waiting time and lowers productivity. There was a problem.

Therefore, the main object of the present invention is to improve productivity by making it possible to continuously fix the magnetic core to the lead wire as described above.

[Means for solving problems]

The manufacturing method of the present invention involves sequentially feeding a plurality of parts in which a magnetic core is passed through a substantially U-shaped lead wire up to just before the predetermined position of the magnetic core. Apply UV-curing and anaerobic-curing adhesive to nearby lead wires, then push the magnetic cores of each component into the lead wires in sequence, and then sequentially irradiate the adhesive on each component with UV rays. It is characterized by curing it.

[Effect]

While sending a plurality of parts, the application of adhesive, the positioning of the magnetic core, and the curing of the adhesive are performed in sequence, thereby continuously fixing the magnetic core to the lead wire.

〔Example〕

FIG. 1 is a plan view showing an example of an apparatus for carrying out the manufacturing method according to the present invention, and FIG. 2 is an enlarged side view showing the roller and its surroundings in FIG. 1.

In this embodiment, a plurality of parts 2a as described above, in which the magnetic core 5 is passed through the lead wire 4 up to the predetermined position thereof, are successively attached to the tape 12 (i.e., taping (shaped workpiece) is used, and this is sent continuously as shown by arrow A, for example.

A roller 18 is disposed in the middle so that its end surface contacts the lead wire 4 near a predetermined position of the magnetic core 5. This roller 18 rotates, for example, as shown by the arrow 3, and is partially immersed in an ultraviolet curable and anaerobic curable adhesive 16 placed in a container 14, with the adhesive 16 on its end surface. is deposited in layers. Therefore, by passing each component 2a over such a roller 18, the adhesive 16 as described above is sequentially applied to the lead wire 4 near a predetermined position of the magnetic core 5.

In the process after applying the adhesive 16, for example, pins (not shown),
The magnetic core 5 of each component 2a is sequentially pushed into a predetermined position of the lead wire 4 in the direction of arrow C using a wire or the like. As a result, the adhesive 16 exists between the magnetic core 5 and the inner lead yA4, and a portion of the adhesive 16 protrudes from the end of the magnetic core 5.

In the next step, the adhesive 16 protruding from the component 2a is sequentially irradiated with ultraviolet rays 20.

Since the adhesive 16 is UV curable, it hardens instantly.

As a result, the magnetic core 5 is fixed, or at least temporarily fixed, to the lead wire 4, and the inductor 2 as described above is sequentially obtained.

In that case, the adhesive 16 on the inside of the magnetic core 5 is anaerobic hardening and hardly comes into contact with air, so it hardens naturally without any special treatment, and the adhesive 16 inside the magnetic core 5 hardens naturally without any special treatment.
Full-scale fixing to the lead wire 4 is performed. Therefore, after irradiation with the ultraviolet rays 20, it is possible to directly proceed to the next step.

In FIG. 1, for convenience of illustration, the process of applying the adhesive 16, the process of pushing in the magnetic core 5, and the process of irradiating the ultraviolet rays 20 are shown adjacent to each other, but it is of course possible to separate them from each other. It is.

Therefore, according to the method described above, the magnetic core 5 can be fixed to the lead wire 4 continuously and, if necessary, on an integrated production line, thereby improving productivity and reducing product costs. becomes.

Further, by adjusting the circumferential speed of the roller 18 and the feeding speed of the tape 12, the amount of adhesive 16 attached to the lead wire 4 can be easily controlled.

Further, by setting the width of the roller 18 as described above, the adhesive 16 can be applied spot-on only to the necessary locations, thereby reducing the consumption amount of the adhesive 16.

Although the above explanation has been given using the inductor 2 shown in FIG. 3(A) as an example, it goes without saying that the present invention can also be applied to manufacturing the inductor 3 shown in FIG. 3(B). It is.

〔Effect of the invention〕

As described above, according to the present invention, the magnetic core can be fixed to the lead wire continuously and, if necessary, on an integrated production line, thereby improving productivity and reducing product costs. .

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of an apparatus for carrying out the manufacturing method according to the present invention. FIG. 2 is an enlarged side view showing the area around the roller in FIG. 1. FIG. 3 is a schematic diagram showing an example of an inductor. FIG. 4 is a schematic diagram for explaining a conventional manufacturing method. 2.3... Inductor, 2a... Component, 4... Lead wire, 5... Magnetic core, 16... Adhesive, 20
...Ultraviolet light. Figure 1 Figure 2

Claims (1)

[Claims] (1) While sequentially feeding multiple parts with a magnetic core passed through a roughly U-shaped lead wire up to just before the predetermined position, for each part, the lead wire is placed at least near the predetermined position of the magnetic core. A UV-curable and anaerobic-curable adhesive is sequentially applied to the magnetic core of each component, and then the magnetic core of each component is sequentially pushed into the predetermined position of the lead wire, and then the adhesive on each component is sequentially irradiated with UV rays to cure it. A method of manufacturing an inductor, the method comprising: