KR102224208B1 - Loading Jig of Nanocrystal ribbon for heat treatment - Google Patents

Abstract

An embodiment of the present invention provides a loading jig for firing a magnetic ribbon of a roller type, in which a magnetic ribbon is rolled and loaded when the magnetic ribbon of an antenna module for NFC/WPC of a mobile phone is heat-treated in an electric furnace. In the loading jig, a plurality of holes may be arranged on the surface of a pipe through which the center is formed.

Description

Loading Jig of Nanocrystal ribbon for heat treatment

The present invention relates to a firing loading jig for firing a magnetic ribbon, as a firing loading jig for firing by loading a magnetic ribbon such as a nanocrystal.

The mobile phone performs functions of near field communication (NFC) and wireless power charger (WPC). In the case of wireless charging (WPC), power is transferred to the battery by using a magnetic field in a magnetic induction method.There are antenna coils built into each of the transmitter (charger) and receiver (smartphone), and control electromagnetic waves under this coil. It is integrated and attached with a magnetic layer (nanocrystal layer) that makes it possible.

In the case of a mobile phone, in order to maintain the efficiency of the NFC and WPC functions, heat treatment is performed on the nanocrystal layer so that the magnetic field characteristics of the magnetic layer (nanocrystal layer) become constant (per area).

The structure of a conventional heat treatment jig is a round bar pipe made of a steel-based (Fe) material, and is used as a jig as shown in FIG. 1 by cutting a general pipe having a diameter of 76 mm x a thickness of 1.5 to 2.0 mm. Magnetic ribbons (thickness: 18~30㎛, length: 50/60/80mm) are wound on the jig by 2Kg each, and then 6~10 pieces are put into the batch-type kiln and firing is performed at once.

In this way, when a magnetic ribbon is loaded on the jig and working in the sintering furnace, at least 4 sides of the rectangular parallelepiped are heated by this heating wire in an electric furnace with electric heaters (coil heating wires), and the entire nanocrystal ribbon inside the sintering furnace is heated. Is delivered. At this time, the amount of heat supplied from the heating wire of the electric furnace is mainly transferred to the jig and nanocrystal ribbon at a given time by convective heat and radiant heat.

However, the heat transferred to the jig acts as a heating source as the secondary latent heat in the cooling time section of the electric furnace, and continues to be supplied to the nanocrystal ribbon as conduction heat, and heat is transferred from the inside of the loading-roll (roll) where the jig is located to the outside. Overheating or undercalcination occurs. Due to this, 20 to 30% (loading amount) of the material inside each nanocrystal loading roll (inside part) is generated as a defective product. Of course, the kiln at this time is when a batch type elevator electric kiln is used.

Korean Patent Registration No. 10-2094548

An object of the present invention is to provide the shape and configuration of a metal jig so as to minimize the latent heat retained in the heating section. In addition, the technical problem of the present invention is to provide an optimal material in consideration of the heat conduction characteristics of the jig material. In addition, the technical problem of the present invention is to provide the location of the "optimization zone" of the heating loading section inside the kiln (electric furnace).

.

In an embodiment of the present invention, in the firing loading jig of a magnetic ribbon in the form of a roller in which the magnetic ribbon is rolled and loaded when the magnetic ribbon of the antenna module for NFC/WPC of a mobile phone is heat-treated in an electric furnace, a pipe having a center penetrating through it It may be formed by arranging a plurality of holes on the surface of the.

The arrangement may include an orthogonal arrangement in which a plurality of holes are arranged orthogonally; A diagonal arrangement in which a plurality of holes are arranged along a diagonal line; A random arrangement in which a plurality of holes are randomly arranged; It may be any one of the arrays.

When the heat treatment temperature of the magnetic ribbon wound around the firing loading jig is 400~500℃, the diameter of the hole formed on the surface of the firing loading jig ranges from 4mm to 8mm, and the thickness of the jig is 1.5mm~ It can be characterized by having 2.0mm.

The material of the firing loading jig may be characterized in that it is made of stainless steel.

The material of the firing loading jig may be characterized in that it is a stainless steel 304 (SUS304), stainless steel 303 (SUS303) material.

When the firing loading jig is mounted in multiple layers, a space of 100 mm or more may be generated between the firing loading jigs by using a stainless steel rod holder.

When heat-treated in an electric furnace, the firing loading jig is located at a location that is 15% or more of the vertical width of the electric furnace from the ceiling surface of the electric furnace, and 15% or more of the vertical width of the electric furnace from the bottom of the electric furnace. It can be characterized in that it is located at a location that is 15% or more of the width of the electric furnace from the side of the electric furnace.

According to an embodiment of the present invention, in the process of heat-treating an amorphous alloy ribbon called nanocrystal in an electric furnace, the annealing and thermal crystallization characteristics at a high temperature are greatly influenced by the variables of heat input and time at 400 to 500°C. In the process, the importance of the material of the jig and the perforated surface composition appears in the heat transfer and cooling rate, so by arranging holes in the firing loading jig, a uniform heat supply inside the electric furnace is realized and the firing quality of each loading jig of the product is improved. The deviation can be reduced. Therefore, it can contribute to reducing manufacturing cost and securing price competitiveness by reducing defects and improving production yield.

1 is an exemplary illustration of a conventional firing loading jig.
Figure 2 is an exemplary picture of a loading jig for firing according to an embodiment of the present invention.
3 is a diagram showing an arrangement rule of holes formed on the surface of a firing loading jig according to an embodiment of the present invention.
Figure 4 is a test data of the defect rate according to the size of the hole formed on the surface of the mounting jig for firing according to an embodiment of the present invention.
5 is a test data of the defect rate according to the material of the firing loading jig according to an embodiment of the present invention.
6 is a distribution data of a defect rate according to a location inside an electric furnace according to an embodiment of the present invention.
7 is an exemplary photograph of an electric furnace equipped with a cradle for loading a jig according to an embodiment of the present invention.

Hereinafter, advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and is provided to completely inform the scope of the invention to those of ordinary skill in the art to which the present invention pertains. As such, the invention is only defined by the scope of the claims. In addition, in describing the present invention, when it is determined that related known technologies or the like may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

2 is an exemplary drawing of a firing loading jig according to an embodiment of the present invention, FIG. 3 is a drawing showing an arrangement rule of holes formed on the surface of a firing loading jig according to an embodiment of the present invention, and FIG. 4 Defect rate test data according to the size of the hole formed on the surface of the firing loading jig according to an embodiment of the present invention, Figure 5 is the defect rate test data according to the material of the firing loading jig according to an embodiment of the present invention, Figure 6 Is the distribution data of the defect rate according to the location inside the electric furnace according to an embodiment of the present invention, and FIG. 7 is an exemplary photograph of an electric furnace equipped with a cradle for loading a jig according to an embodiment of the present invention.

In the present specification, the term'jig' refers to a roll jig in which the magnetic ribbon is wound when the magnetic ribbon (nanocrystal ribbon) of the antenna module for NFC/WPC of the mobile phone is heat-fired and fired.

In addition, the heat treatment in the present invention refers to a high-temperature treatment process performed near the Curie temperature to anneal and crystallize the ribbon of an amorphous alloy material or Fe alloy material. The furnace refers to a sintering furnace in which sintering heat treatment is performed.

When the magnetic ribbon of the antenna module for NFC/WPC of the mobile phone is heat-treated in an electric furnace, the firing loading jig of the magnetic ribbon in the form of a roller in which the magnetic ribbon is rolled and loaded, as shown in FIG. It has a feature that a plurality of holes are arranged on the surface of the.

It is to form a number of holes by drilling on the surface of the pipe-shaped firing jig. The inner surface of the firing loading jig is polished to prevent burr or foreign matter from occurring.

With a firing loading jig diameter of 76mm, a firing loading jig length of 50mm/60mm/80mm, and a jig thickness of 1.5~2.0mm, holes are made on the entire surface of the pipe through which convective and radiant heat can penetrate. The size of one hole (one) is 4.0~8.0mm in diameter, and the maximum amount is processed on the surface of the jig by perforating.

The arrangement of holes formed by drilling on the entire surface of the firing loading jig is an orthogonal arrangement in which a plurality of holes are arranged orthogonally, as shown in FIG. 3, a diagonal arrangement in which a plurality of holes are arranged along a diagonal line, and a plurality of The holes may have any one of the random arrangements arranged at random. Uniform heat transfer is possible through such an arrangement, so that variations in plastic properties can be reduced.

In addition, the length of the firing loading jig is 50mm, 60mm, 80mm, and all three lengths are applicable. However, preferably, when the heat treatment temperature when heat treatment of the magnetic ribbon wound around the firing loading jig is 400 to 500°C, the diameter of the hole formed on the surface of the firing loading jig has a range of 4 mm to 8 mm, and the jig The thickness of should be 1.5mm~2.0mm.

Referring to FIG. 4, after loading 2 kg of magnetic ribbon on a firing jig having a thickness of 1.5 mm, length of 60 mm, and diameter of 76 mm, the first 400° C. heat treatment, the second 500° C. heat treatment, and cooling are performed in order. Fig. 4 shows the defect rate when having a hole diameter of 4 mm, and it was confirmed through an experiment that the defective rate when the hole diameter was 8 mm was reduced. This means that when the heat treatment temperature for firing is within the range of 400 to 500°C, convective heat and radiant heat can be smoothly penetrated when the diameter of the hole formed on the surface of the firing loading jig is in the range of 4 mm to 8 mm, thereby reducing the variation in firing characteristics. Because there is.

In addition, the material of the firing loading jig of the present invention is made of stainless steel. As the material of the loading jig for firing, a stainless steel 304 (SUS304), stainless steel 303 (SUS303) series of materials is used. Previously, a steel (Fe) round bar was used, but stainless steel was used to improve the heat conduction characteristics of the firing loading jig.

For reference, FIG. 5 is an experimental value showing the defect rate according to the material of the firing loading jig, and referring to FIG. 5, it can be seen that the defect rate is improved when a stainless steel material is used.

On the other hand, when the firing loading jig is mounted in multiple layers in the electric furnace (kiln) shown in FIG. 7, the firing loading jig in which the magnetic ribbon is loaded inside the firing furnace is sequentially stacked and loaded from the bottom, followed by a heat treatment process.

In this way, when the firing loading jig is mounted in multiple layers, a space of 100 mm or more is generated between the firing loading jigs using a stainless steel rod holder. At this time, the material of the rod holder is made of SUS304, and the diameter of the rod holder is preferably 6.0 to 10.0mm. In this way, a space of 100 mm or more is generated between the firing loading jigs in order to achieve uniform heat transfer between the firing loading jigs.

Furthermore, the present invention proposes an optimized space location of a loading section for firing inside a kiln for uniform heat transfer.

In other words, the location of the firing loading jig when heat-treated in the electric furnace is located at a location that is 15% or more of the vertical width of the electric furnace from the ceiling surface of the electric furnace, and 15% or more of the vertical width of the electric furnace from the bottom of the electric furnace. It is placed at a location that is 15% or more of the width of the electric furnace from the side of the electric furnace so that the plastic heat treatment work can be performed.

That is, the average coexistence area of heat inside the kiln has the most uniform quality and less defects when it is loaded with about 15% spaced apart from the walls, floor, and ceiling of the hexahedral kiln as shown in FIG. 7. Eventually, the quality is uniform and the defect rate is low when placed more than 15% from the floor in the inner longitudinal direction (when the interior is 1,000mm high, load it with a 150mm gap from the floor and wall).

The embodiments in the description of the present invention described above are presented by selecting the most preferable examples to aid the understanding of those skilled in the art from among various possible examples, and the technical idea of the present invention is not necessarily limited or limited only by this embodiment. , Various changes and modifications and other equivalent embodiments are possible within the scope of the technical spirit of the present invention.

Claims (7)

In the firing loading jig of a magnetic ribbon in the form of a roller in which the magnetic ribbon is rolled and loaded when the magnetic ribbon of an antenna module for NFC/WPC of a mobile phone is heat-treated in an electric furnace,
A plurality of holes are arranged and formed on the surface of the pipe through which the center is penetrated,
When the heat treatment temperature at the time of heat treatment of the magnetic ribbon wound around the firing loading jig is 400~500℃,
The firing jig for firing magnetic ribbons, characterized in that the diameter of the hole formed on the surface of the firing loading jig ranges from 4mm to 8mm, and the thickness of the jig is 1.5mm to 2.0mm.
The method of claim 1, wherein the arrangement,
An orthogonal arrangement in which a plurality of holes are arranged orthogonally;
A diagonal arrangement in which a plurality of holes are arranged along a diagonal line;
A random arrangement in which a plurality of holes are randomly arranged;
A mounting jig for firing a magnetic ribbon, characterized in that it is arranged in any one of the.
delete The method according to claim 1, wherein the material of the firing loading jig,
A loading jig for firing magnetic ribbons characterized by being made of stainless steel.
The method of claim 4, wherein the material of the firing loading jig,
A mounting jig for firing magnetic ribbons characterized by being made of stainless steel 304 (SUS304) and stainless steel 303 (SUS303).
The method according to claim 1,
When the firing loading jig is mounted in multiple layers, a space of 100 mm or more is generated between the firing loading jigs using a stainless steel rod holder.
The method according to claim 1, the position of the firing loading jig when heat-treated in an electric furnace,
It is located at a location that is 15% or more of the vertical width of the electric furnace from the ceiling surface of the electric furnace.
It is located at a location that is 15% or more of the vertical width of the electric furnace from the bottom of the electric furnace.
A mounting jig for firing magnetic ribbons, characterized in that it is located at a location 15% or more of the width of the furnace from the side of the electric furnace.

Images