JPH05243065A - Fabrication of amorphous cut core - Google Patents

Abstract

PURPOSE:To prevent a core from being deformed owing to deterioration of characteristics caused by prior art varnish hardening distortion, a core from being deformed owing to cutting and polishing, and further prevent a core from being cracked and deformed upon demounting a bobbin of an iron plate. CONSTITUTION:A winding frame is formed with non-magnetic stainless 3, and an amorphous raw material plate 2 is wound on the bobbin of the non-magnetic stainless 3 into a laminated core from the inside to the outside. Further, the laminated core is annealed and is rendered to epoxy powder application 4. A heat shrinkable tape 5 is wound around a circuit portion of the core and is dried and hardened, and thereafter the cut portion is cut down and a cut surface is polished in precision. Herein, the same effect will be manifested by employing a cotton tape instead of the heat shrinkable tape 5 and impregnating, drying and hardening the cotton tape with varnish.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an amorphous cut core for manufacturing a cut core used in various transformers.

[0002]

2. Description of the Related Art A conventional method of manufacturing an amorphous cut core has the following steps. An iron plate is used for the reel that winds the iron-based amorphous material plate that is the material of the core. Wrap an iron-based amorphous material plate around the iron plate reel. Annealing is performed to remove internal strain and increase the spreadability. Perform varnish impregnation to strengthen the insulation. Dry and cure to integrate the wound layers. After fixing the entire iron core, cut at two points. Precisely polish the cut surface. Remove the iron plate on the reel.

[0003]

However, in the conventional method for manufacturing an amorphous cut core, deterioration of characteristics due to varnish hardening strain, deformation of the core due to cutting / polishing, deformation of core crack when removing the reel of the iron plate, etc. occur. There is a problem.

The present invention has been made in view of the above points, and there is no deterioration of characteristics due to varnish hardening strain, no deformation of the core due to cutting and polishing, and core cracking when the reel of the iron plate is removed. It is an object of the present invention to provide a method for producing an amorphous cut core that does not cause deformation or the like.

[0005]

In order to solve the above-mentioned problems, an amorphous cut core manufacturing method according to the present invention is an amorphous cut core manufacturing method in which a cut core is manufactured from an iron-based amorphous material. A winding process that uses non-magnetic stainless steel for the winding frame for core winding, a powder coating process that performs insulation coating, and a tape winding process that winds a heat-shrinkable tape at the cutting location to prevent core deformation due to cutting and polishing. And is characterized in that the winding frame removing step before finishing is omitted.

In order to solve the above-mentioned problems, another method of manufacturing an amorphous cut core according to the present invention is an amorphous cut core manufacturing method in which a cut core is manufactured from an iron-based amorphous material as a raw material. The winding process that uses non-magnetic stainless steel for the winding frame, the powder coating process that performs insulating coating, and the cutting point is wrapped with cotton tape to prevent core deformation due to cutting and polishing, and this cotton tape is impregnated with varnish. And a tape winding step of drying and curing the varnish, and is characterized in that the winding frame removing step before finishing is omitted.

[0007]

The iron-based amorphous material plate is wound and laminated on the non-magnetic stainless steel reel by the above-mentioned method for producing an amorphous cut core. Since the non-magnetic stainless steel is used for the reel in this way, it is not necessary to remove the reel during finishing. Since the powder coating is performed by the fluid immersion method, the characteristics of the iron-based amorphous material plate are not deteriorated by the varnish hardening strain. Wrap a heat shrink tape around the cutting point,
Alternatively, a cotton tape is wound to impregnate the varnish and dry-cure to prevent deformation of the core due to cutting and polishing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial perspective view of an amorphous cut core manufactured according to the present invention. In the figure, 1 is an amorphous cut core, 2 is an amorphous material plate, 3 is non-magnetic stainless steel, 4 is powder coating, and 5 is a heat shrink tape.

First, a winding frame is made of non-magnetic stainless steel 3 to match the shape of the core. The amorphous material plate 2 is laminated on the winding frame of the non-magnetic stainless steel 3 from the inner side to the outer side to form a core winding. Laminated cores are annealed to remove internal strain and increase malleability. Epoxy powder coating 4 is applied to the annealed core. That is, coating is performed by a fluid immersion method which is one of powder coating methods. The core heated to about 150 ° C. is dipped in the floating epoxy powder, and the epoxy powder is melted and adhered around the core. After taking out, heat and dry. The heat shrink tape 5 is wound around the cut portion of the coated core. Dry
After the curing, the cutting portion around which the heat shrink tape 5 is wound is cut. The cut surface is precisely finished and polished.

When a cotton tape is used instead of the heat shrink tape 5, the cotton tape is impregnated with varnish and dried.
Let it harden. Since this is after the powder coating step of coating by the fluid immersion method, which is one of the powder coating methods, the varnish does not permeate between the laminated iron cores and the characteristics of the iron cores are not deteriorated. Therefore, the same effect as using the heat shrinkable tape 5 can be expected. It is sufficient to impregnate at least the tape with the varnish.

FIG. 2 is an explanatory view for explaining the cutting of the core according to the present invention. As shown in the figure, the heat-shrinkable tape 5 is wound around the cut portion of the core (shown by a broken line), the heat-shrinkable tape 5 is wound, dried and cured, and then cut to manufacture the amorphous cut core 1.

FIG. 3 is a comparison diagram of the hysteresis curves of the amorphous cut core manufactured by the conventional method and the amorphous cut core manufactured by the method of the present invention. In the figure, the horizontal axis represents the coercive force (H), and the unit is Oe (oersted). The vertical axis represents the remanence (B), and the unit is KG (kilogauss). A curve A drawn by a solid line is a hysteresis curve of an amorphous cut core manufactured by the method of the present invention, and compared with a hysteresis curve B drawn by a broken line of an amorphous cut core manufactured by a conventional method, the magnetic permeability and the hysteresis loss are considerably increased. You can see that it has been improved.

[0013]

As described above, the method for producing an amorphous cut core according to the present invention comprises a winding process using non-magnetic stainless steel for a winding frame for core-winding an iron-based amorphous material plate, and a powder for performing insulation coating. It has a body coating process and a tape winding process that winds a heat-shrinkable tape that prevents deformation of the core due to cutting / polishing at the cutting point, and omits the winding frame removing process before finishing. Winding process that uses non-magnetic stainless steel for the winding frame that winds the core, powder coating process that performs insulation coating, and a cotton tape that prevents deformation of the core due to cutting and polishing at the cutting point. Impregnate the varnish and dry the varnish.
Since it has a tape winding process for curing and omits the winding frame removing process before finishing, there is no deterioration of characteristics due to varnish curing strain due to fluid immersion, and core deformation due to cutting and polishing with heat shrink tape at the cutting part There is no need to remove the frame by the non-magnetic stainless steel winding frame incorporated inside,
There is no core crack deformation when removing the frame. Therefore, improvement in processing accuracy and processing speed of the amorphous cut core can be expected, which greatly contributes to cost reduction.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an amorphous cut core manufactured according to the present invention.

FIG. 2 is an explanatory diagram illustrating cutting of a core according to the present invention.

FIG. 3 is a comparison diagram of hysteresis curves of amorphous cut cores.

[Explanation of symbols]

 1 Amorphous cut core 2 Amorphous material plate 3 Non-magnetic stainless steel 4 Powder coating 5 Heat shrink tape

Claims (2)

[Claims] 1. A method for manufacturing an amorphous cut core for manufacturing a cut core from an iron-based amorphous material, comprising: a winding process using non-magnetic stainless steel for a winding frame for winding a core of an iron-based amorphous material plate; and insulating coating. Amorphous cut characterized by having a powder coating process and a tape winding process that winds a heat-shrinkable tape to prevent deformation of the core due to cutting and polishing at the cutting point, and omits the reel removing process before finishing. Core manufacturing method. 2. The amorphous material according to claim 1, wherein in the tape winding step, a cotton tape is used instead of the heat shrinkable tape, the cotton tape is impregnated with a varnish, and the varnish is dried and cured. Cut core manufacturing method.