KR102472321B1 - Blank having porosity distribution, method of manufacturing the same and metal plate manufactured from the same - Google Patents

Abstract

The present invention relates to a publication having a pore distribution, a manufacturing method thereof, and a metal plate manufactured therefrom. Publication according to the present invention is plate-shaped, the central portion having a first porosity; It is located on both sides of the center and includes a surface portion having a second porosity lower than the first porosity.

Description

Publication having porosity distribution, manufacturing method thereof, and metal plate manufactured therefrom {Blank having porosity distribution, method of manufacturing the same and metal plate manufactured from the same}

The present invention relates to a publication having a pore distribution, a manufacturing method thereof, and a metal plate manufactured therefrom.

In the manufacture of medals or commemorative coins, it is important that the protruding pattern has a high reflectivity or uniform illumination around the protruding pattern while being implemented with a deep depth.

Medals or commemorative coins are manufactured by stamping and stamping a disc-shaped public notice.

Existing publications do not have porosity because they are manufactured by blanking a plate, and are manufactured through a process called sintering as a method for improving the depth. In the case of the blanks manufactured by the corresponding process, the whole has a uniform porosity. If the porosity is large, it is possible to implement a deep depth, but it is difficult to have high reflectivity or uniform illumination in the surrounding area. .

PCT Publication No. WO2016/154774 (2016. 10. 06. Publication)

The present invention relates to a publication having a pore distribution, a manufacturing method thereof, and a metal plate manufactured therefrom.

In the publication, the object of the present invention, the publication is plate-shaped, the center having a first porosity; This is achieved by including a surface portion located on both sides of the central portion and having a second porosity lower than the first porosity.

A material of the central portion and the surface portion may be silver, copper, or an alloy.

The first porosity may be 5 to 20%, and the second porosity may be 0.1 to 10%.

An object of the present invention is a method for manufacturing a publication, comprising the steps of preparing an original table made of metal powder; and firing the original table, wherein the circle table includes a center layer made of metal powder having a first particle size; and a surface layer having a second particle size smaller than the first particle size.

The metal powder may be any one of silver powder, copper powder, and alloy powder.

The central layer may have a first melting point, the peripheral layer may have a second melting point lower than the first melting point, and the firing may be performed between the first melting point and the second melting point.

The porosity of the central portion is 30% to 50%, and the porosity of the peripheral portion may be 5% to 30%.

An object of the present invention is a metal plate having a protruding pattern formed on at least one surface thereof, wherein the surface of the metal plate includes: a matte portion having the protruding pattern and having low reflectivity; It is formed flat around the protruding pattern and includes a glossy portion having high reflectivity, and the porosity of the surface of the non-illuminated portion is lower than the porosity of the surface of the glossy portion.

The metal plate may include: a first metal portion having a first porosity, some of which are located in the center, and the others are located in the protruding pattern; and a second metal part having a second porosity lower than the first porosity, a portion of which is located on a surface of the shiny portion, and a portion of which is located on a surface of the protruding pattern.

A portion of the first metal part may be exposed to the outside from the protruding pattern.

The first porosity may be 5 to 20%, and the second porosity may be 0.1 to 10%.

The metal plate may be made of any one of silver, copper and an alloy.

A publication having a pore distribution, a manufacturing method thereof, and a metal plate manufactured therefrom are provided in the present invention.

1 is a perspective view of a public announcement according to a first embodiment of the present invention;
2 is a cross-sectional view taken along line II-II' of FIG. 1;
3 is a cross-sectional view of a publication according to a second embodiment of the present invention;
4 is a perspective view of a metal plate according to an embodiment of the present invention;
5 is a cross-sectional view taken along V-V′ of FIG. 4;
6 shows a method for manufacturing a publication according to an embodiment of the present invention,
7 and 8 show a manufacturing method of a publication according to another embodiment of the present invention.

The present invention will be described in detail with reference to the drawings below.

The present invention has been described with reference to an embodiment shown in the accompanying drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. You will be able to. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

The 'metal plate' in the present invention includes medals or coins. The 'metal plate' in the present invention has a protruding part and a flat peripheral part, and can be called a 'special stamped product'.

The announcement according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

FIG. 1 is a perspective view of a public announcement according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view along line II-II′ of FIG. 1 .

The announcement 10 has a disk shape as shown in FIG. 1 . In another embodiment, the announcement 10 may be variously modified, such as a rectangular plate.

The announcement 10 has a central portion 11 and a surface portion 12 as shown in FIG.

Bulletin 10 is made of gold, silver, copper or an alloy. The alloy is not limited thereto, but Ag-Cu alloy, sterling silver, cupronickel (75Cu 24Ni), bronze, brass, and the like may be used.

The central portion 11 has a first porosity and the surface portion 12 has a second porosity lower than the first porosity. The first porosity may be 5 to 20%, and the second porosity may be 0.1 to 10%.

The thickness d1 of the central portion 11 may be 2 to 20 times or 5 to 10 times the thickness d2 of the surface portion 12 .

In other embodiments, materials of the central portion 11 and the surface portion 12 may be different.

Referring to Fig. 3, an announcement according to a second embodiment of the present invention will be described.

Figure 3 is a cross-sectional view of a portion corresponding to Figure 2;

The canvas 10 is composed of five layers 10a to 10e, and the porosity increases from the layers 10a and 10e located on the surface to the layer 10c located in the center.

In another embodiment, the number of layers of the announcement 10 may be changed, and in another embodiment, a configuration in which the porosity decreases as it approaches the center without distinction of layers is also possible.

A metal plate according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5 .

4 is a perspective view of a metal plate according to an embodiment of the present invention, and FIG. 5 is a cross-section taken along line V-V′ of FIG. 4 .

The metal plate 20 is made of silver, copper or an alloy.

The surface of the metal plate 20 includes a protruding pattern 21 and a peripheral portion 22 around the protrusion pattern 21 . The peripheral portion 22 is provided flat, and the protruding pattern 21 protrudes outward compared to the peripheral portion 22 . A first surface layer, a center layer, and a second surface layer are sequentially formed along the thickness direction.

The surface on which the protruding pattern 21 is located forms a matte portion with low reflectivity, and the surface on which the peripheral portion 22 is located forms a glossy portion with high reflectivity. The matte portion may have uniform illumination.

The metal plate 20 includes a first metal part 210 and a second metal part 220 .

The first metal part 210 has a first porosity and the second metal part 220 has a second porosity lower than the first porosity. The first porosity of the first metal part 210 may be 5 to 20%, and the second porosity of the second metal part 22 may be 0.1 to 10%.

A part of the first metal part 210 is located in the center of the metal plate 20 and the rest is located in the protruding pattern 21 . A part of the first metal part 210 positioned on the protruding pattern 21 may be exposed on the surface.

The second metal portion 220 is present on the surface of the metal plate 20, some of which is located on the peripheral portion 22, and the other is located on the surface of the protruding pattern 21.

In the metal plate 20 according to the present invention, the protrusion pattern 21 has a relatively large depth d3 due to the first metal portion 210 having a high porosity. In addition, reflectivity of the peripheral portion 22 is high due to the second metal portion 220 having a low porosity. The depth d3 is not limited thereto, but may be greater than 400 um or greater than 500 um, and specifically may be 400 um to 1000 um or 500 um to 2000 um. The depth d3 may vary depending on the weight or overall thickness of the metal plate 30 .

Hereinafter, the manufacturing method of the announcement will be described with reference to FIGS. 6 to 8. The manufacturing method of the following publication will be described by exemplifying the method of manufacturing the publication according to the first embodiment.

6 shows a method for manufacturing a publication according to an embodiment of the present invention, and FIGS. 7 and 8 show a method for manufacturing a publication according to another embodiment of the present invention.

As shown in FIG. 6, a plate-shaped circular table made of metal powder is prepared. The 'won table' in the present invention may also be called a 'green compact' in the form of a metal powder before sintering. The 'won table' or 'green compact' may be in the form of pressing the metal powder before heat treatment.

The circular table is composed of a center layer made of metal powder having a first particle size and a surface layer made of metal powder having a second particle size. The circular table includes a first surface and a second surface facing in opposite directions.

Since the first particle size is larger than the second particle size, the porosity of the center layer is larger than that of the surface layer. The central layer has a relatively high first melting point due to its large porosity, and the peripheral layer has a relatively low second melting point due to its small porosity. Although not limited thereto, in the case of using silver, the first melting point may be 1100 ° C to 1300 ° C, and the second melting point may be 200 ° C to 800 ° C.

Thereafter, the original table is fired to prepare a public table. The firing temperature is a temperature between the first melting point and the second melting point, but is not limited thereto, and may be 800° C. to 1000° C.

In another manufacturing method, as shown in FIG. 7, after preparing the center circle table through firing, a metal powder having low porosity is applied to both sides of the center circle table. Thereafter, the metal powder applied on both sides is sintered or partially melted to prepare a sheet.

In another manufacturing method, as shown in FIG. 8, a center circle table and a surface circle table are each manufactured through firing, and then a ball table is manufactured by combining the center circle table and the surface circle table.

All of the publications prepared by the above method have a high porosity in the center and a low porosity on the surface.

Although not shown, a metal plate is manufactured by embossing, pressing, and the like.

When manufacturing a metal plate, a deep protruding pattern can be formed by the center having a high porosity. In addition, a peripheral portion having high reflectivity may be formed by the surface portion having a low porosity.

During the manufacturing process of the metal plate, a central portion having a high porosity may be partially exposed on the surface of the protruding pattern.

Claims (12)

delete delete delete In the production method of publication,
Preparing a plate-shaped circular table made of metal powder and having a first surface and a second surface facing in opposite directions; And
Including the step of firing the original table,
The original table,
a center layer made of metal powder having a first particle size; and
a first surface layer forming the first surface; and
A second surface layer forming the second surface,
The center layer is located between the first surface layer and the second surface layer,
The first surface layer and the second surface layer have a second particle size smaller than the first particle size,
The central layer has a first melting point,
The first surface layer and the second surface layer have a second melting point lower than the first melting point,
Wherein the firing is performed between the first melting point and the second melting point. According to claim 4,
The metal powder is any one of silver powder, copper powder and alloy powder. delete According to claim 5,
The porosity of the center layer is 30% to 50%,
The production method of the publication that the porosity of the first surface layer and the second surface layer is 5% to 30%. A protruding pattern is formed on at least one surface of the metal plate,
The surface of the metal plate,
an unilluminated portion in which the protruding pattern is formed; and
A glossy portion formed flat around the protruding pattern,
The porosity of the surface of the matte part is lower than the porosity of the surface of the shiny part,
The metal plate,
It has a center layer, a first surface layer and a second surface layer,
Orienting the first surface layer and the second surface layer in opposite directions to each other,
The center layer is located between the first surface layer and the second surface layer,
The metal plate,
a first metal portion having a first porosity; and
A second metal part having a second porosity lower than the first porosity,
The first metal part is partially located in the center layer and the rest is located in the first surface layer and the second surface layer in the protruding pattern,
A portion of the second metal part is located on the first surface layer and the second surface layer of the shiny part, and the rest is located on the first surface layer and the second surface layer of the protruding pattern. delete delete According to claim 8,
The first porosity is 5 to 20%,
The second porosity is 0.1 to 10% of the metal plate. According to claim 8,
The metal plate is made of any one of silver, copper and an alloy.

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