JPS6236862B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing an amorphous alloy laminate. Amorphous alloys are produced as foil strips with no crystalline structure by ultra-quenching molten alloy, and have excellent properties such as high electrical resistance, low iron loss, and good excitation characteristics. It is expected to be used as an iron core material. However, due to the characteristics of the manufacturing method, amorphous amorphous alloys are difficult to handle because they are obtained as foil strips with a thickness of about 10 to 50 μm, and they also have the disadvantage that their excitation characteristics are easily deteriorated due to deformation and distortion due to processing. . Therefore, the present inventors provided a solution to these problems in Japanese Patent Application No. 58015/1983 (Japanese Unexamined Patent Publication No. 175654/1982). One of the methods is to apply an adhesive containing a highly heat-resistant polymer as a main component to an amorphous amorphous alloy foil strip, stack them together and heat bond them to form an amorphous amorphous alloy strip, and then create a laminated iron core from this amorphous azure alloy strip.
This method involves manufacturing a wound core, etc., and then annealing it in a magnetic field at 300 to 500°C to manufacture a laminate of amorphous alloy. FIG. 1 shows one method for producing an amorphous alloy laminate. For example, as shown in FIG. A highly heat-resistant polymer adhesive is applied thereto, pressed by a pressure roll 9, and heat-bonded in a heating furnace 10 to form an amorphous alloy strip 11. This amorphous alloy strip 11
is further laminated to form a laminate, and then dried and hardened while being excited in a magnetic annealing furnace 13 having an excitation coil 12 shown in FIG. 1B to produce a laminated core 14. However, the laminated core manufactured by this method involves applying a highly heat-resistant polymeric adhesive to amorphous alloy foil strips and laminating them, and then applying a heat bonding process (heating furnace 1).
The excitation characteristics may be inferior to those of a laminated core manufactured by heat bonding and annealing in a magnetic field at 300 to 500° C. without going through the above steps. That is, when the laminated core is excited and the relationship between the magnetic field strength and the amount of passing magnetic flux is investigated, it is found that when manufacturing the laminated core, the magnetic field annealing (FIG. 1 b) is performed after the heat bonding process (heating furnace 10). The excitation characteristics have not fully recovered and the amount of passing magnetic flux decreases. The present invention provides a method for producing an amorphous alloy laminate with excellent magnetic field properties, which solves the above-mentioned drawbacks that occur when an electric furnace is used in the heat bonding process. The present inventors have discovered that when manufacturing a laminated iron core by heat-bonding amorphous aluminium alloy foil strips coated with a highly heat-resistant polymer adhesive to form an amorphous amorphous alloy laminate and then annealing in a magnetic field, the excitation characteristics of the amorphous amorphous alloy In some cases, recovery may not be adequate.
It was determined that the cause was the heating furnace used in the heat bonding process. In other words, in Figure 1A, an alternating current normally flows through the heating element that makes up the heating furnace, and the amorphous alloy laminate is bonded by heating due to the complex magnetic field created by the alternating current flowing through the heating element. This is because the magnetic field is sometimes excited in a disordered manner, which reduces the effect of magnetic field annealing in the subsequent process. The present invention is characterized in that an amorphous alloy laminate coated with an adhesive mainly composed of a highly heat-resistant polymer is heat-bonded in an electric furnace while shielded with a magnetic shield, and then annealed in a magnetic field. DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained in detail below based on embodiments and with reference to drawings. FIG. 2A is a diagram showing an example of heat bonding an amorphous alloy laminate by the method of the present invention. A tubular electric heating furnace 10' for thermally bonding amorphous alloy foil bodies coated with adhesive is composed of a furnace core tube 10'a and a heating element 10'b wound around the furnace core tube 10'a. A magnetic shielding cover 15, which is a pipe, is inserted (FIG. 2A). The amorphous alloy strip 11' passes through the magnetic shielding cover 15 and is heat-bonded without being affected by the complicated magnetic field created by the alternating current flowing through the heating element. At this time, it is desirable that the magnetic shielding cover 15 be longer than the length of the furnace tube 10'a in order to completely block the lines of magnetic force. As the magnetic shielding cover, a magnetic shielding body having a magnetic shielding effect such as a metal material ranging from nonmagnetic to ferromagnetic and a nonmetallic ferromagnetic material such as a ferrite core is used. In addition, when the furnace core tube 10'a itself has a magnetic shielding effect, the furnace tube itself serves as a magnetic shielding cover. As another embodiment of the present invention, the heating furnace shown in FIG. It is a cross-sectional view of the furnace,
Amorphous amorphous alloy laminate 1 cut to required length
4' is covered with a magnetic shielding cover 15' so as to shield it from the magnetic field created by the alternating current flowing through the heating element 10''b of the electric furnace 10'', so that heating and bonding can be performed without being affected by harmful magnetic fields. At this time, the magnetic shielding cover 15' is naturally more effective if it covers the entire amorphous alloy laminate 14'. As detailed above, in the present invention, when amorphous alloy laminates are heat-bonded using an electric furnace, by using a magnetic shielding cover, the magnetic field created by the alternating current flowing through the heating element of the electric furnace is Since it is blocked by the magnetic shielding cover and does not reach the amorphous alloy laminate, it does not have any adverse effect on the excitation characteristics. Therefore, the excitation characteristics of the amorphous alloy main body are sufficiently recovered by annealing in a magnetic field performed after heat bonding, and outstanding characteristics as an iron core material can be obtained. Table 1 shows the manufacturing conditions and manufacturing results of an amorphous alloy laminate according to an example of the present invention in comparison with a conventional method.

【table】

[Table] According to the method of the present invention, as shown in Table 1, the magnetic permeability is higher than that of the laminated core manufactured by the conventional method.
The results showed that the loss was even lower at higher magnetic flux densities. As detailed above, according to the present invention, when amorphous amorphous alloy laminates are bonded by heating in an electric furnace, deterioration of excitation characteristics during post-process annealing in a magnetic field is prevented by using a magnetic shield, and high-quality amorphous Alloy laminates can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the manufacturing method of an amorphous alloy laminate, A is a process diagram, B is a magnetic annealing furnace, Fig. 2 is an explanatory diagram of an electric heating furnace in the heat bonding process according to the present invention, and A is an online A diagram showing an example of a magnetic shielding method, and (b) a diagram showing an example of an off-line magnetic shielding method.

Claims (1)

[Claims] 1. An amorphous amorphous alloy laminate coated with an adhesive mainly composed of a highly heat-resistant polymer, which is heat-bonded in an electric furnace while shielding with a magnetic shield, and then annealed in a magnetic field. How the body is manufactured.