JPS6034008A - Manufacture of ferrite bead inductor - Google Patents

Abstract

PURPOSE:To obtain an inductor element with a stable quality with a high productivity by a method wherein bumps are formed on a continuous conductor with a certain interval and ferrite powder with a binder of thermosetting resin or thermoplastic resin is attached around each bump and subjected to a compression molding into a bead shape and cured and the conductor is cut into pieces each of which contains one bead. CONSTITUTION:A bump 12 is formed by upper and lower punches 20 on a conductor 11 supplied from the direction of an arrow 10. The conductor 11 is transferred into a ferrite bead molding die 22 and when the bump 12 is positioned in the die 22 the conductor 11 is temporarily stopped. A mixture of a resin binder and ferrite powder is supplied into the die 22 by a piston 23 and a required bead shape 13 is obtained by a compression molding. Then the bead shape molded part is transferred into a heating furnace 25 and cured and drawn out. The conductor 11 is cut by a cutter 26 into pieces each of which contains one completely cured bead 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a ferrite bead inductor element.

A ferrite bead inductor, which is used as an effective inductor element to connect a magnetic conductor with IMH7,1>IP, is made by inserting a conductor wire 2 into a cylindrical ferrite bead 1, as shown in Figure 1. However, two different methods are used to fix this ferrite bead to the conductor.

A typical example of this fixing method is shown in FIGS. 2 and 3.

In FIG. 2, after the conductor 2 is inserted into the ferrite bead 1, an adhesive 6 is applied to the insertion gap between the conductor 2 and the ferrite bead and on both sides of the bead, injected and hardened, or as shown in FIG. 2 is inserted, the conductive wire near both ends of the ferrite bead 1 is crushed to form protrusions 4, thereby forming a ferrite bead inductor.

However, in this method, firstly, the conductor wire is inserted through the pores of the cylindrical ferrite bead, so the conductor wire is likely to be bent during insertion, the ferrite bead may be cracked or chipped, and the adhesive must be used. Injecting a small amount causes fluctuations in the injection amount and takes time for the curing process, making it difficult to automate as the device cannot be moved during this time.Also, in the structure where the conductor is crushed as shown in Figure 6, the conductor is likely to break. .

Furthermore, since the ferrite bead is not completely fixed to the conductor, there are various problems such as the ferrite bead being susceptible to cracking or chipping due to vibration.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a method for manufacturing a ferrite bead inductor element with high productivity and stable quality.

A method of manufacturing a ferrite beat inductor according to the present invention will be explained below with reference to the drawings.

FIG. 4 is a conceptual diagram showing the manufacturing process of the ferrite beat inductor and inductor according to the present invention, in which the conducting wire 11 is supplied from the direction of the arrow 10 on the left side and moved to the right side, and is first placed at the position A. It is.

Here, the upper and lower notches 20 move in the direction of the arrow 21 to form a protrusion 12 on the conductor, and then the conductor is sent to the position B. Here, the ferrite bead forming mold 22 placed at position B is clamped in the direction of the arrow 24, and the piston 23 pushes the ferrite powder containing the thermosetting binder phase into the cavity of the mold 22, forming a convex shape. A ferrite bead 13 is formed around the conductive wire 11 having a ferrite bead 12 formed thereon.

Furthermore, the thermosetting binder phase is sequentially transferred to position C, and is completely cured in the tunnel-shaped heating furnace 25 disposed at position C.

The ferrite bead formed with a certain pinch on the continuous conductive wire in this way is transferred to position D, and the cutter blade 26 placed here moves in the direction of the arrow 27 to sequentially cut the conductive wire and produce ferrite beads. It is completed as a bead inductor 14.

In the above explanation, the protrusions 12 provided on the conductor wire 11 are provided in order to firmly bond the ferrite beats 13 to the conductor wire 11, but by selecting an appropriate bonding material, it is possible to eliminate the protrusions 12. good. That is, step A can also be omitted.

Now, for the ferrite bead forming sound shown in part B of the final diagram, thermoplastic resin may be used as the bonding material.

In this case, the tunnel-shaped heating furnace in section C can be omitted.

In addition, in order to increase the speed of ferrite bead forming, ferrite powder containing a thermosetting binder as shown in FIG.
As shown in b), the upper die 61° is inserted into the cavity 65 of the upper punch 62 and the lower die 36° is inserted into the cavity 66 of the lower punch 34, and after the conductor 11 is fixedly clamped with the upper and lower dies, it is inserted with the upper and lower punches. Pressure mold the powder pellets.

As described above, according to the present invention, it is possible to continuously manufacture a ferrite beat inductor with stable quality, and it is possible to provide a manufacturing method that can be automated and has high productivity.

[Brief explanation of drawings]

Figure 1 is a perspective view of a ferrite beat inductor, Figure 2
Figure 3 is a schematic diagram showing the manufacturing process of a conventional ferrite beat inductor, Figure 5 (a) is a pellet used in the present invention, and Figure 5 (b) is a schematic diagram of a mold used in the present invention. shows. In fig. 1: Ferrite bead, 2: Conductive wire, 6: Adhesive. 4: Protrusion provided on conductor 2, 11: Continuous conductor. 16: Molded ferrite bead, 2o: Punch for forming the protrusion 12, 22 Near erite bead mold, 23: Piston, 25: Heating furnace, 26: Cutter,
6o: Ferrite powder pellet, 31.33: Upper and lower molding dies, 32, 34: Upper and lower punches.

Claims (1)

[Claims] 1) Ferrite powder using a thermosetting or thermoplastic resin as a binder is molded and pressed into a plurality of beads at a certain distance from a continuous conductive wire, and after being hardened, a predetermined shape is formed. A method for manufacturing a ferrite bead inductor, which is characterized by cutting it into dimensions. 2) Providing a protrusion on the conductor and surrounding the protrusion with ferrite.
Patent for process of forming and heating beads