JPH0319683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soft magnetic thin plate as a material suitable for forming a core material of a magnetic head, a transformer, etc., by employing, for example, a melt ultra-quenching method.

Hard and brittle soft magnetic materials such as Sendust alloy, Alperm alloy, and high-silicon steel are sometimes used as core materials for magnetic heads, transformers, etc., but since soft magnetic materials are difficult to roll with rolls, grinding, etc. The core was manufactured by cutting out the core material from the block using the method described above, and through polishing and wrapping. However, with this method, productivity is extremely low and core processing costs are high.
Furthermore, there is a limit to the thickness of the core that can be manufactured, and it is difficult to make it extremely thin (less than 500 μm).

On the other hand, core materials have also been formed by methods such as physical vapor deposition, chemical vapor deposition, and sputtering. However, vapor deposition, sputtering, etc. are also poor in productivity.

Furthermore, it is difficult to strictly control the composition of the thin plate by vapor deposition, sputtering, etc., and it has been impossible to produce a thin plate with excellent magnetic properties.

Recently, when manufacturing a core from a hard and brittle soft magnetic material, a method of manufacturing a soft magnetic thin plate using a melt ultra-quenching method has come to be used.

In this method, thin plates are manufactured in one step in a simple process, so productivity is high, and the magnetic properties of the obtained thin plates are generally excellent, so it can be said to be a highly practical processing method.

When cores are taken from thin sheets manufactured in this way and used in magnetic heads, transformers, etc.
Since it is necessary to increase the space factor of the core, a thin plate with a smooth surface is required.

As a method for producing a thin plate with a smooth surface, a twin roll method as shown in FIG. 1 is adopted among the ultra-quench processing methods. That is, 0 shows an example of a melt super-quenching device, and this melt super-quenching device 0 is as follows:
A resistance heater H is provided at its tip with a nozzle 1A through which the molten base material 2 melted in the heat-resistant container 1 is ejected onto the rolls 3, 3, and is suspended around the outer periphery of the heat-resistant container 1.
Alternatively, the molten base material 2 housed in the heat-resistant container 1 is heated by appropriate heating means such as high-frequency heating.

Then, the molten base material 2 heated in the heat-resistant container 1 by a heating means such as a heater H is introduced into the heat-resistant container 1 with an inert gas such as argon gas, and by instantly increasing the pressure, the molten base material 2 is rolled from the nozzle 1A. A thin plate 4' is obtained by ultra-quenching the material on the surface of the jetting rollers 3, 3 and rolling it within the rollers 3, 3.
By rolling between the rolls 3 and 3 in this manner, a thin plate 4 ₁ ' having a convex cross section as shown in FIG. 2 is obtained. This is because the molten base material 2 rolled between the rolls 3, 3 is cooled on the surfaces of the rolls 3, 3, and its rigidity increases, and the surfaces of the rolls 3, 3 are elastically deformed to have a convex cross section.

When the thin plates 4 ₁ ' having such a shape are used in a stacked manner, the result is a core with a poor space factor as shown in FIG. 3. Furthermore, the stability when laminated was poor, and it was difficult to make the thickness of the left and right sides of the core material equal.

In addition, when manufacturing the thin plate 4 ₁ ' by the twin roll method, the melting temperature of the molten base material 2, the jetting speed from the nozzle 1A, the circumferential speed of the surface of the roll 3, the diameter of the roll 3,
The rolling load of the rolls 3 and the like are the main factors that determine the shape of the thin plate 4 ₁ ′.

The present invention has been made in view of the above points, and its purpose is to improve mechanical strength by flattening a convex thin plate, and to improve the core space when a laminated core is formed. The rate is high;
The inherent properties of the material, such as magnetic flux density and magnetic permeability, can be utilized, and the thickness of the adhesive used to laminate the core material can be made uniform and thin, resulting in strong adhesive strength and problems such as easy peeling. The aim is to provide a soft magnetic thin plate with less oxidation.

The details of the present invention will be explained below with reference to the drawings.

Then, the molten base material 2 is jetted out to the rollers 3, 3 of the melt super-quenching device 0 shown in FIG. A thin plate 4 is formed which has concave grooves 4A, 4A extending in the upper and lower surfaces in the longitudinal direction at the center thereof.

Among the main factors that determine the shape of the thin plate using the twin-roll method, the conditions for manufacturing the thin plate 4 mentioned above are particularly important, such as the temperature of the molten base material, the diameter of the rolls 3, and the circumferential speed of the rolls 3, 3. . Further, when the ejection speed of the nozzle 1A is set to 0.2 cc/sec or more and the rolling load of the rolls 3, 3 is set to 0.2 ton or more, the temperature of the molten base material is selected to be 30° C. or more higher than the melting point of the material.

Further, when the diameter of the rolls 3, 3 is 40 mm, the desired thin plate 4 can be obtained by selecting the circumferential speed of the rolls 3, 3 from 0.5 m/sec to 3 m/sec.

Also, if the diameter of rolls 3 and 3 is 100mm,
Circumferential speed of rolls 3 and 3 from 0.5m/sec to 4m/sec
A desired thin plate 4 can be obtained by selecting the following.

Next, some embodiments of the present invention will be described.

Example (1) First, a sendust alloy (melting point 1250°C) with a composition of A1-Si-Fe of 5.4:9.6:85 weight percent was heated in a heat-resistant container 1, and the nozzle 1 of the heat-resistant container 1 was heated.
The liquid was ejected from A to the rolls 3, 3 at a temperature of 1550° C. and at a ejection speed of 1 c.c./sec to the rolls 3, 3. In this case, the diameter of the rolls 3, 3 is 100 mm, the circumferential speed of the rolls 3, 3 is 4 m/sec, and the rolling load of the rolls 3, 3 is 1 ton. A thin plate 4 is produced.

In addition, as Example 2, an alloy (melting point 1480°C) with a Fe-Al-Mo composition ratio of 84:14:2 weight percent was melted into the base material 2.
heating container 1.
Blowout temperature 1550℃ from nozzle 1A, circumferential speed 2m/
When the molten base material 2 is jetted onto the rollers 3, 3 with a diameter of 40 mm rotating at sec, the pressing force of the rollers 3, 3 is
When the weight was 2 tons, a thin plate 4 having a substantially convex cross section as shown in FIG. 4 was obtained.

Example 3 Next, an Fe-Si alloy (melting point 1300°C) having a composition ratio of 93.5:6.5% by weight was melted in the heating container 1, and from the nozzle 1A,
0.5cc/sec jetting speed, diameter 100mm, circumferential speed 4
It was ejected onto rolls 3, 3 rotating at m/sec. In this way, a thin plate 4 having a substantially convex cross section as shown in FIG. 1 was obtained.

Example 4 In addition, an Fe-Ni alloy (melting point 1470°C) having a composition ratio of 40:60 weight percent was melted in the heating container 1, and from the nozzle 1A, 0.4
With a jetting speed of cc/sec, a diameter of 100mm, and a circumferential speed of 3m/sec.
It squirted onto rolls 3 and 3, which rotated at sec. In this way, a thin plate 4 having a substantially convex cross section as shown in FIG. 4 was obtained.

Example 5 An Fe-Co-Si alloy (melting point 1360°C) having a composition ratio of 77:13:10 weight percent was melted in a heat-resistant container 1, and then melted through a nozzle 1A.
0.5cc/sec jetting speed, diameter 100mm, circumferential speed 3.5
It was ejected onto rolls 3, 3 rotating at m/sec. As a result, a thin plate 4 having a substantially convex cross section as shown in FIG. 4 was obtained.

Example 6 Further, an Fe-Al alloy (melting point 1470°C) having a composition of 84:16 weight percent was melted in the heating container 1, and from the nozzle 1A, 0.3
Ejection speed of cc/sec, diameter 100mm, peripheral speed 4m/
It squirted onto rolls 3 and 3 rotating at sec. In this way, a thin plate 4 having a substantially convex cross section as shown in FIG. 4 was obtained.

A thin plate 4 having such a substantially convex cross-sectional shape
A magnetic head and a transformer were formed using a laminate core that was formed by cutting or polishing the core into a desired shape. In this case, since the adhesive 5 accumulates in the grooves 4A, 4A provided in the longitudinal direction of the thin plate 4, the adhesive force between the laminated core materials increases. Since the upper and lower thin plates 4 forming the laminate core can be stacked by abutting the left and right protrusions of the grooves 44 provided in the longitudinal direction, the space factor becomes high. The original performance of the material,
For example, the performance of magnetic flux density and magnetic permeability can be utilized.

Since the protrusions located on the left and right sides of the grooves 4A provided on the thin plates 4 of the laminate core on which the magnetic head and transformer are to be formed are brought into contact with each other vertically, the thin plates 4 can be stacked stably. Since the laminate core can be stacked stably in this manner, the mechanical strength of the core can be increased.

Note that the thin plate 4 may be formed of an amorphous metal other than the above embodiment.

As mentioned above, the soft magnetic thin plate of the present invention has a generally convex cross-sectional shape perpendicular to its length direction, and has grooves in the longitudinal direction in its center, making it flatter than conventional thin plates. Since it is formed into a laminate core, the space factor of the core material is high when a laminate core is formed, and the inherent performance of the material, such as magnetic flux density and magnetic permeability, can be utilized. Furthermore, since the thickness of the adhesive used to laminate the core materials is uniform and can be made thin, the adhesive strength is strong and peeling is easy, resulting in fewer troubles.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of the twin roll method in a contact ultra-quenching device, Fig. 2 is a bottom view also showing the twin rolls, and Fig. 3 is a lamination of thin plates formed by the above twin rolls. FIG. 4 is a sectional view showing an example of the laminate core of the present invention also formed by the twin rolls described above. 1...Heat-resistant container, 2...Melting base material, 3...Roll, 4...Thin plate, 4A...Concave groove.

Claims (1)

[Claims] 1. A soft magnetic thin plate characterized in that the cross-sectional shape perpendicular to the length direction is substantially convex, and a groove extending in the length direction is formed in the center thereof.