JPS62286214A - Manufacture of amorphous magnetic core - Google Patents

Abstract

PURPOSE:To increase an occupation rate and to prevent the generation of exforiation of the smorphous thin film strip of a cut part when it is cut by a method wherein resin is impregnated into a tape-wound magnetic core before, in the middle of, or after performance of a heat treatment, and the side face of the magnetic core is polished. CONSTITUTION:Resin is impregnated into a tape-wound magnetic core before, in the middle of, or after performance of a heat treatment, and then the side face of the magnetic core is polished. The heat treatment is usually performed in the inert gas such as Ar ga, N2 gas and the like, or in a vacuum, or the heat treatment may be performed in the atmospheric air according to circumferences. It is desirable that the plate or the block and the like such as metal ceramic and the like is applied to the surface at right angle to the surface to be polished when a polishing work is performed, because an amorphous thin strip is hardly exforiated even when a work is performed thereon at high speed. Also, when a cut core is manufactured, the generation of exforiation of the amorphous thin strip of the cut part is prevented by cutting it almost vertical to the polished surface after polishing, the cut surface can be smoothed by polishing the cut surface after polishing, and the magnetic characteristics can also be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing an amorphous magnetic core used in high frequency transformers, choke coils, etc. The amorphous magnetic core used is a toroidal-shaped closed magnetic circuit core made by winding an amorphous thin ribbon produced by a single roll method, etc. After winding, it is impregnated and cut to be used as a cut core. Problems to be Solved] However, the amorphous magnetic core described above has a problem in that the position of the amorphous ribbon tends to shift in the width direction of the amorphous ribbon when it is wound, making it difficult to achieve dimensional accuracy of the magnetic core. For this reason, there was a problem in which the space factor decreased.0 Also, when making a cut core, if the position of the amorphous ribbon is shifted in the width direction, even if impregnation is performed, the unevenness of the side surface may cause localization. force is added.

There was a problem in that the rear amorphous ribbon easily peeled off at the cut portion. Furthermore, since it is difficult to achieve dimensional accuracy when using a bobbin, it is necessary to make the width of the amorphous ribbon a little smaller than the bobbin size.

Therefore, the cross-sectional area becomes small, and the characteristics of high saturation magnetic flux Wj degree and low loss of the amorphous magnetic core can be utilized.

In the case of cut cores, there have been problems such as deterioration in characteristics due to peeling of the amorphous ribbon at the cut portion.

An object of the present invention is to provide a method for manufacturing an amorphous magnetic core that has a high space factor and is suitable for high-frequency transformers, choke coils, etc., where the amorphous ribbon at the cut portion is unlikely to peel off during cutting. Means for Solving the Problems] The present invention provides a process for manufacturing an amorphous magnetic core in which an amorphous ferromagnetic ribbon is wound and heat-treated in a vacuum or an inert gas before the heat treatment.

This method of manufacturing an amorphous magnetic core is characterized by including a step of impregnating the wound core during or afterward and polishing the side surface.

In the present invention, the amorphous ferromagnetic ribbon is, for example, at least one type selected from the following formula: 0≦a≦1.0≦b≦0.5.0≦X≦80≦y≦18
, 0≦2≦30.15≦7+z≦30.

The amorphous ferromagnetic ribbon used in the present invention is exploded by a single roll method or a twin roll method.

Impregnation is performed using epoxy resin, modified alkyl silicate, or the like. In some cases, vacuum impregnation is performed. For polishing the side surface, flat grinding with a GC grindstone or the like, polishing with emery paper, etc. can be applied.

The heat treatment is usually carried out in an inert gas such as Ar gas or Nt gas or in vacuum. In some cases, it may even be in the atmosphere.

It is more preferable to apply a plate or block of metal, ceramics, etc. to the surface perpendicular to the surface to be polished during polishing, since the amorphous ribbon is less likely to peel off even if the processing speed is increased.

Further, when producing a cut core, by performing a method of cutting substantially perpendicular to the polished surface after polishing, peeling of the amorphous ribbon at the cut portion is less likely to occur.

Furthermore, by polishing the cut surface after cutting, the cut surface becomes smooth and the magnetic properties can be improved.

〔Example〕

The present invention will be explained below according to examples.

Example 1 Cog@Fe with a width of 5 strips and a plate thickness of 18 μm was produced by a single roll method.
4Mo2. s St+g, s B9 A 97 morph gold ribbon was prepared and wound into the shape shown in FIG. Next, an amorphous magnetic core was produced by applying the manufacturing method of the present invention in which the core was held at 420° C. for 1 hour in a N2 gas atmosphere, rapidly cooled, vacuum impregnated with epoxy resin, and side surface A was dry-ground with a GC grindstone.

A comparison of the space factor of the magnetic core manufactured according to the present invention and a conventional magnetic core whose side surfaces are not polished shows that when the manufacturing method of the present invention is applied, the space factor is 83 cm, while that of the conventional magnetic core is 80%, which is about 3 cm. The same occupancy factor was observed.

Next, a cut core was produced by cutting almost perpendicular to the polished surface. When the manufacturing method of the present invention was applied, no opening of the amorphous ribbon at the cut portion was observed, but in the case of the conventional manufacturing method, a portion of the amorphous ribbon at the cut portion peeled off, creating a gap between the ribbons. Ta.

As explained above, the magnetic core manufactured according to the present invention not only has a higher a ratio than the conventional amorphous magnetic core, but also has a higher performance and uneven It is possible to obtain an amorphous cut core with less.

Example 2 Table 1 shows Cogs Few Mn produced according to the present invention.
s, sMoz, s 5its B9A97 Amorphous cut core using fluoro-gold ribbon and Co55 Fe2Mn3. produced by conventional manufacturing method. s MO2,I
t 5its B* Space factor P of amorphous cut core
, 100KHz, Bm = 2 KG core loss pB, 100KHz effective permeability μe 100 K
Compare and show.

The space factor of the amorphous magnetic core tabulated by the manufacturing method of the present invention is larger than that produced by the conventional manufacturing method, the core loss pB is small, and the effective magnetic permeability μe is large.

Therefore, the amorphous magnetic core manufactured by the manufacturing method of the present invention is suitable for use as a magnetic core for a high frequency transformer, etc.

Table 1 Example 3 Table 2 shows the cases in which a Fet4Nbx Si+4Be amorphous wound core was impregnated and polished on the side surface, and when a stainless steel plate was applied to the surface perpendicular to the surface to be polished, and when nothing was applied (the surface was polished). In each case, it is shown how many amorphous magnetic cores out of 100 amorphous magnetic cores have amorphous ribbon peeling.

As shown in Table 2, if the plate is applied to a surface perpendicular to the surface to be polished, there will be less peeling and more favorable results will be obtained.

〔Effect of the invention〕

According to the present invention, it is possible to improve the space factor of the amorphous magnetic core, which has been insufficient in the past, and to improve the dimensional accuracy.Furthermore, when producing a cut core, it is possible to reduce the peeling of the amorphous ribbon at the cant part, thereby improving the magnetic properties. Deterioration and variation can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the shape of the magnetic core according to the present invention when viewed from the side.

Claims (4)

[Claims] (1) In the manufacturing process of an amorphous magnetic core in which an amorphous ferromagnetic ribbon is wound and heat treated in vacuum or in an inert gas, the wound core is impregnated with resin before, during or after the heat treatment, and the side surfaces are polished. A method for manufacturing an amorphous magnetic core, the method comprising the steps of: (2) The method for manufacturing an amorphous magnetic core according to claim 1, characterized in that the polishing is carried out by applying a plate or block of metal, ceramics, etc. to a surface perpendicular to the surface to be polished. (3) The method for manufacturing an amorphous magnetic core according to claim 1 or 2, which includes the step of cutting substantially perpendicular to the polished surface after polishing. (4) The method for manufacturing an amorphous magnetic core according to claim 3, which includes the step of polishing the cut surface after cutting.