JPS59141351A - Production of soft magnetic thin sheet - Google Patents

Abstract

PURPOSE:To obtain a light-gage strip which is longer in right and left edge parts than the axial centerline and has a desired thickness and length even if it is a hard and brittle soft magnetic material by heating, melting and cooling ultraquickly the soft magnetic material by using an ultraquickly cooling device for a melt. CONSTITUTION:A ''Sendust'' alloy 9 as a soft magnetic material heated and melted by a heating vessel 11 is injected from a nozzle 13 to the space between rolls 12 by the inert gas, such as gaseous argon, forced into the heat resistant vessel 11. The alloy 9 is ultraquickly cooled and a thin sheet is obtd. The size and sectional area of the thin sheet are determined by various conditions such as the temp. of the molten base material, injection speed, the diameter and rotating speed of the rolls, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a soft magnetic ribbon, which employs a melt ultra-quenching method and is particularly suitable for forming a core material of a toroidal transformer.

Conventionally, when forming a core material for a MC lance or the like, a cold-rollable material such as a permalloy alloy is used by forming a thin plate 2 cold-rolled by cold-rolling rolls 1, 1, as shown in FIG. A toroidal core 3 as shown in FIG. 2 is formed by winding it into a ring shape, or a laminated core 5 is formed by stacking core pieces 4 obtained by punching or the like as shown in FIG. (See Figure 5).

Therefore, it was not possible to use the cold rolling or punching methods used for permalloy alloys with hard, brittle, soft magnetic materials such as sendust alloy and high-silicon steel. Therefore, as shown in FIGS. 6(a) to 6(c), after slicing the block 6 to form the core material 7,
were laminated to form a laminated layer: 175. However, in methods such as permalloy alloys, in which the core material is formed from a thin strip or thin plate of uniform thickness each time by employing a cold rolling method, it takes several times to produce a thin strip of the desired thickness. , which required repeated cold rolling, which was time-consuming. In addition, since the surface of the ribbon was smooth when forming the toroidal core 3, it was easy to slide.

In this way, smoothing the surfaces to prevent the ribbons from sliding against each other has the disadvantage that it is time consuming.

Furthermore, hard and brittle magnetic materials such as sendust alloy and high-silicon steel are processed into thin plates by cutting from the block 6, polishing, lapping, and the like.

However, this method lowers production efficiency and increases processing costs, and the thickness of the core plate that can be manufactured is also limited due to processing. Despite the material having better properties than permalloy alloy, However, it was difficult to actually use it.

This invention has been made in view of the above-mentioned points, and its purpose is to use a melt ultra-quenching method to improve the axial center of hard and brittle soft magnetic materials such as sendust alloy and high silicon steel. Since the left and right edges are longer than the above, it is possible to obtain the desired length of 7J with the desired thickness, so the thin plates can be positioned on the ring without any processing such as roughening the surface. An object of the present invention is to provide a method for manufacturing a soft magnetic thin plate which can easily be wound into a toroidal core.

A first embodiment of the present invention will be described below with reference to FIGS. 7 to 16.

8 shows an example of a melt super-quenching device used to carry out the present invention. It is formed from a heat-resistant heating container 11 and a nozzle 13 provided at the tip of the heating container 11 so as to jet the heated and melted sendust alloy 9 between cooling rolls 12, 12. Then, the melted sendust alloy is heated in the heating container 11 by pressurizing an inert gas such as argon gas into the heat-resistant heating container 11, and is injected from the nozzle 13 between the rolls 12° and 12 to create a super The thin plate 14 is obtained by rapid cooling, but the thin plate 14
The dimensions and cross-sectional shape of the roller are determined by various conditions such as the temperature of the molten base material, injection speed, roller diameter, and rotation speed.

In this case, if the temperature of the sendust alloy 9 as the molten base material is lowered and the rotation speed is increased to cool it uniformly, a soft magnetic material with a convex cross-sectional shape perpendicular to the length and width directions as shown in FIG. A thin plate 14 is produced.

Here, the convex shape refers to one in which the ratio Do/d of the thickness Do at the central black point in the cross section and the thickness d at a point B where lAl1tI rubs across the entire width of the thin plate 14 is 1 or more. . In addition, the obtained AV plate 14 has two vertical planes separated by a distance a on the axis M when the axis M of the thin plate 14 is extended in a straight line as shown in FIG. S+.

When cutting at S2, the length b of the edges 14A, 14A on both sides becomes longer than the distance a of the axis M. The reason why the edges 14A, 44A on both sides of the thin plate 14 are elongated beyond the axis M is that when ultra-quench rolling is performed under appropriate conditions, the kissing surfaces of the rolls 12.12 are As shown in Figure 10, the axis M of the thin plate 14 is at both edges 14A,
Since it receives a larger receiving force than 14A, the edge portions 14A and 14 on both sides extend more than the axis M.

Specifically, the conditions for obtaining a thin plate 14 using sendust alloy with a convex cross-sectional shape and edges 14A, 14A on both sides extending beyond the axis M are a-, II/l 2
, 12 has a diameter of φ100, the sendust alloy is 1250-1600℃, and the rotation speed of the roll 12.12 is 4.
00 to 200 Or, p, m, the receiving pressure of the roll 12.12 is in the range of 5 to 15 tons, and the sendust alloy has a kissing surface dimension β2 of the roll 12.12 of ±5 ± 2, the cross section of the roll This is the case where the directional dimension β2 is ejected within a range of ±0.2 times (see Figure 11).
. At this time, the width and thickness of the thin plate 14 become parameters for the flow rate of sendust alloy from the nozzle 13 and the rotation speed of the rolls 12.12. When the flow rate of sendust alloy from the nozzle 13 is approximately 1 β/steam, and the rotational speed of the roll 12.12 is 100° r, p, m, the width is approximately 51, the thickness is 50 mμ, and the cross-sectional shape is convex. The edges on both sides are 14Δ in shape.

14A is elongated beyond its axis M, so that a thin plate 14 is manufactured in which the edges 14A, iiΔ on both sides of the thin plate 14 are undulating as shown in FIG. 12, or twisted as shown in FIG. 13.

When the thin plate 14 thus obtained is rolled into a ring shape, its cross section becomes a state in which the edges 14A and 14Δ on both sides are warped and monozeta-polymerized, as shown in FIG. Therefore, when this thin plate 14 is wound several times to form a ring shape, this warpage can be used as a guide, so that the superposed thin plates 14 do not slide sideways with respect to each other, as shown in FIG. 15. The thin plate 14 can be rolled up into a ring shape.

In this way, a transformer that boosts the output voltage of the MC cartridge is formed by enclosing the rolled thin plate 14 in the case 15 and hardening it with resin, and then winding the primary or secondary conductor. can.

In the above example, the toroidal core of the MC-transformer is made of Sendust alloy, but even in the case of high-silicon steel, the ultra-quenched roll 12°12 is slightly higher than that of Sendust alloy. (7 tons or more), the end portions 14Δ and 14Δ on both sides of the thin plate 14 are elongated from the axis M, as in the case of Sendust alloy.

Furthermore, the toroidal core manufactured from such a thin plate 14 is not a small one like an M C-l-lance,
It is also possible to produce larger transformer cores. In this case, as the width of the produced thin plate 14 increases, the diameter of the roll increases, and the pressure applied by the rolls 12, 12 is increased to sufficiently increase the number of rotations of the rolls. Furthermore, by increasing the flow rate of the molten soft magnetic material from the nostle 13, the width of the thin plate 14 can be increased. Other conditions are the same as when the roll diameter is lQcm.

In this way, even if the thin plate 14 is wide, it is possible to manufacture a thin plate 14 in which the edges 14A and 14Δ on both sides are longer than the central portion.

In addition, in this embodiment, although the twin rolls using rolls 12. If the shape of the nostle 13 and the shape of the roll are carefully selected and appropriate conditions are selected, it is possible to produce the soft magnetic ribbon as described above.

As mentioned above, the present invention employs the melt super-quenching method even for hard (and brittle) soft magnetic materials such as sendust alloy and high silicon steel, so that the left and right edges are longer than the axis of the material as desired. A thin strip of the desired length can be obtained with a thickness of Therefore, toroidal cores can be easily manufactured.

[Brief explanation of the drawing]

Figure 1 is a slope view showing the conventional cold rolling process for manufacturing permalloy alloys, Figure 2 is a slope view showing 1-loidal core, and Figure 3 is a slope view showing the conventional punching process. 4 is a perspective view showing a laminated core, FIG. 5 is a perspective view showing an example of cutting out core material from one block, and FIG. 6 is a perspective view showing a core material used in the first embodiment of the present invention. FIG. 7 is a cross-sectional view showing the device, FIG. 7 is a perspective view showing an example of a thin plate injected using this device, FIG. 8 is a cross-sectional view M of this thin plate, and FIG. 9 similarly shows the external configuration of the thin plate. FIG. 10 is a front view showing an example of the twin rolls used in the device in this example, and FIG. 11 is a cross-sectional view showing the kissing surface of the roll used in this device and the dimension in the cross-sectional direction of the roll. Figure, 12th
Figures 1 and 13 are perspective views showing different modifications of the thin plate sprayed under special conditions using the device shown in Figure 11, and Figure 14 shows the same thin plate rolled into a toroidal shape. A cross-sectional view, FIG. 15 is a perspective view of a thin plate wound in a toroidal shape, and FIG. 16 is a perspective view showing a toroidal core. DESCRIPTION OF SYMBOLS 10... Heater, 11... Heating container, I2... Roll 13... Nostle, 14... Substrate, 14A...
Edge M...Axis line, Sl, S2...Vertical plane Patent applicant Pioneer Corporation Fig. 11 Fig. 14 Fig. 13 Fig. 15 Fig. 12 Fig. 14 Fig. 1'+ Fig. 16

Claims (2)

[Claims] (1) A thin strip of soft magnetic material such as sendust alloy or high silicon steel is manufactured using a melt super-quenching method so that the cross-sectional shape is convex and the left and right edges are longer than the axis. A method for manufacturing a soft magnetic thin plate characterized by the following. (2) The kissing surface of the same 7-roll is arranged below the nozzle of the heating container, and the rotation speed is 400 to 200 Or, p, m, and the pressure received from the roll is in the range of 5 to 15 tons. is ±5 mm ±2 mm, roll cross-sectional direction, n2Q,
The soft magnetic material according to claim 1, characterized in that a thin plate is manufactured by injecting the soft magnetic material such as sendust alloy or high-silicon steel using twin rolls rotatable within a range of 2 mm and ultra-quenching the soft magnetic material. Method of manufacturing thin plates.