JP2001321874A - Manufacturing method of coin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a coin in which a change is made in a base pattern on a surface of a coil by the three-dimensional carv ing, the brightness of the coin is increased, and the decorative value or the amusement value of the coin is improved. SOLUTION: In the manufacturing method of the coin used in an amusement center, a simultaneous three-axis NC control milling machine 9 capable of achieving the cutting in the thickness direction of a die 2 and a diagonal direction at an arbitrary angle is moved on the surface of the die 2 for pressing the coin to give the pattern on the surface thereof while repeating the cutting direction and the depth in a predetermined pattern, and by repeating this operation over the entire surface of the die 2, a three-dimensional geometrical pattern is obtained on the surface of the obtained coin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing coins (metal medals) used for a medal game machine or the like in a game facility, and more particularly to a decoration of a coin surface.

[0002]

2. Description of the Related Art Conventionally, in various types of medal machines used in game centers and the like in amusement facilities, various games can be enjoyed using coins such as metal medals used only in the facilities. .

On the surface of the coin, characters consisting of names and abbreviations representing each amusement facility, or patterns consisting of unique figures representing the amusement facility are drawn, and coins of different facilities are mixed. I try not to.

As shown in FIG. 6, the pattern drawn on the surface of these coins is previously engraved in press dies 2 installed in a press machine 1 for manufacturing coins.
Is pressed and punched out, and at the same time, the unevenness of the mold 2 is inverted and expressed on the surface of the coin 3 by the pressing pressure.

FIG. 7 shows a mold 2 used for manufacturing coins.
And the pattern of characters and the like on the surface of the coin 3 are described. The convex portion 4 which has a convex shape in cross section, which is a character represented on the surface of the coin 3, corresponds to the portion carved into a concave shape in the mold 2. Then, a portion which emerges on the surface of the coin 3 with respect to the press die 2 is dug in the thickness direction by a plane engraving machine 5 for performing the operation.

In the case of a cutting tool such as the plane engraving machine 5 that cuts only in the thickness direction, the portion of the cut character and the like and the portion that has not been cut are finished with a flat surface, so that the color of the metal remains unchanged. However, the flat portion (cross section of the mold 2) on which the mold 2 is not cut is irregularly and finely ground with an electric discharge machine to perform so-called pear ground finishing, The part corresponding to the convex part 4 (the mold 2
Of the coin 3 obtained by being pressed by the mold 2, the ground pattern portion is pear-finished, and the projections 4 of characters and the like are mirror-finished. The finishing effect is used to enhance the decorative effect of the coin 3 in the visual observation.

Of course, contrary to the above, the ground pattern may be mirror-finished and the character portion may be pear-finished, or the whole may be mirror-finished or pear-finished.

FIG. 8 shows a three-dimensional engraving machine 6 capable of cutting the mold 2 in the thickness direction of the mold 2 and in an oblique direction at an arbitrary angle. Is formed, and a convex portion 7 having an arbitrary cross-sectional shape is formed on the surface of the obtained coin 3, and the convex portion 7 expresses a person, animals and plants three-dimensionally to further decorate the coin 3. The effect is enhanced.

[0009]

As described above, these coins can display amusement facilities where the coins are used or enhance the decorative effect by means of characters or figures raised on the surface. As described above, the ground pattern excluding the characters and figures is one of a flat surface finish, a mirror surface finish, and a pear ground finish, and has little change.

[0010] In addition, coins used in a medal game machine have a trade-off in cost and the like as compared with ordinary coins, and it is difficult to use expensive metals, and the brightness of the surface is often dull.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a coin, in which the ground pattern on the surface of the coin is changed by three-dimensional engraving, the brightness of the coin is increased, and the decoration value or play value of the coin is enhanced. It is.

[0012]

According to one aspect of the present invention, there is provided a method of manufacturing a coin used in an amusement arcade, wherein the coin is pressed to display a pattern on the surface. A simultaneous triaxial NC milling machine capable of cutting in the thickness direction of the mold and in the oblique direction at an arbitrary angle is moved over the surface of the mold while repeating the cutting direction and depth in a fixed pattern. This is a coin manufacturing method in which a three-dimensional geometric pattern is obtained on the surface of the obtained coin by repeating this process over the entire mold surface.

According to the first aspect of the present invention, a simultaneous three-axis control NC milling machine in which the cutting direction and the cutting depth can be arbitrarily changed is not used for figures such as persons, animals and plants drawn on a coin surface, but is used for gold. By repeating the pattern in a fixed pattern on the surface of the mold, a new ground pattern consisting of a three-dimensional geometric pattern that does not rely on mirror finish or pear finish is drawn on the bullion part of the coin, increasing the decoration value of the coin To enhance.

According to a second aspect of the present invention, in the method of manufacturing a coin according to the first aspect, a portion corresponding to a pattern such as a character, a figure, or the like that appears on the surface of the coin in the mold is subjected to simultaneous three-axis control NC milling. This is a method for manufacturing coins that are cut into V-shaped grooves by a machine.

The simultaneous three-axis control NC used in the first aspect of the present invention.
If a portion corresponding to a pattern such as a character or a figure protruding on the surface of the coin is cut into a V-groove shape using a milling machine, the portion of the character or the like on the surface of the coin obtained has a slope from the side edge. As compared to what is engraved by a plane engraving machine, the surface area of the pattern part increases and the light reflection surface increases, and the side edges of the characters and the like that have emerged are shadows due to the rising of the convex parts. Since it does not occur, the brightness increases, and at the same time, light is reflected at various angles because the inclined surface is oriented in various directions depending on the pattern of characters, figures, and the like.

[0016]

Embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, using a simultaneous three-axis control NC milling machine 9 for three-dimensional engraving, the mold 2 is moved laterally while changing the cutting depth and angle in a fixed pattern with respect to the mold 2, and specified. Is drawn on the mold 2.

By repeating this operation, a ground pattern consisting of a repetitive pattern is formed on the surface of the mold 2.

This repetitive pattern is based on simultaneous triaxial control N
If the correlation between the cutting depth / angle and the lateral movement is set in advance in the C milling machine 9 by a program or the like, a predetermined pattern can be engraved automatically and without failure.

Next, as in the prior art, using a plane engraving machine
A pattern corresponding to a place where the coin is to be used, such as a character or a figure, which finally emerges on the surface of the coin, is engraved at a predetermined position of the mold 2. (Not shown)

The simultaneous three-axis control NC milling machine 9 is used regardless of the order in which a portion corresponding to a character or a figure is first carved by a plane engraving machine.
Finally, the ground pattern by the simultaneous three-axis control NC milling machine 9 may be carved on the surface of the mold 2.

The engraved mold 2 is polished while rotating a metal brush or feather brush using diamond particles to remove burrs and the like of the mold 2 and to smooth the corners, and to press coins after pressing. To prevent the coin from being angular, and to enhance the releasability of the pressed coin from the mold 2.

Further, if necessary, a concave portion corresponding to the convex portion 4 (or 7) protruding from the coin 3 may be polished and mirror-finished.

Next, similarly to FIG. 4 shown in the conventional example, the mold 2 is set in the press machine 1, and the pattern of the mold 2 is reversely transferred onto the surface of the coin 3 by pressing pressure.

FIGS. 2A and 2B show a coin 3 obtained by the coin manufacturing method of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a front sectional view, and FIG. 2C is an enlarged view of FIG. FIG.

As shown in the figure, a fine grid-like pattern is formed in the ground pattern 8, thereby obtaining a shining different from the ground pattern of a coin which has been conventionally finished with a flat surface, a mirror surface or a pear surface. Can be

FIG. 3 shows another example of a coin obtained by the method for manufacturing a coin according to the present invention. FIG. 3 (A) shows a groove-like line at a constant interval and a shallow groove at a predetermined interval in the groove. In this method, the simultaneous triaxial control NC milling machine 9 is moved on the mold while changing the depth at a predetermined interval, and is then moved to the mold. Obtained by using a mold that is repeatedly shifted in the direction perpendicular to the moving direction of.

Although the above-mentioned pattern requires skill in manual work, the simultaneous three-axis control NC milling machine 9 is controlled by a computer, and the positional relationship between the simultaneous three-axis control NC milling machine 9 and the mold is programmed in advance. You can easily get the same thing.

(B) is a pattern in which the ground pattern 8 is a mesh pattern, and (C) is a pattern in which the ground pattern 8 is wavy. Even for these complicated patterns, a predetermined pattern is programmed at the time of manufacturing a mold. By doing so, coins having these ground patterns 8 can be easily obtained.

FIG. 4 shows another embodiment of the present invention, in which the simultaneous three-axis control NC
Using a milling machine 9, a portion corresponding to a pattern such as a character or a figure protruding on the surface of a coin is cut from two directions at a fixed angle to form a V-shaped groove 10 having a V-shaped cross section.

FIGS. 5A and 5B show a coin 3 formed by using a mold 2 in which a pattern portion such as a character is formed in a V-shaped groove 10 as shown in FIG. 4, wherein FIG. 5A is a plan view and FIG. FIG. 3 is a front cross-sectional view in which a letter “J” is formed on the surface.

Since the character portion is formed by the V-groove of the mold 2 shown in FIG. 4, its cross section has two inclined surfaces 11.

Since this character has an inclined surface 11 from the side edge and protrudes from a part of the base metal, compared with a character having a convex cross section obtained by a mold engraved by a plane engraving machine, The surface area of the character portion increases and the light reflection surface increases, and the character portion rises with the inclined surface 11 continuously from the side edge portion of the character or the like, so that the shadow due to the rising of the convex portion does not occur. So the shine increases.

Further, since the inclined surface 11 of the character is oriented in various directions on the surface of the coin 3, it reflects light at various angles, so that the brightness increases further with the ground pattern shown in FIG. Become.

[0035]

As described above, according to the method for manufacturing a coin of the present invention, a three-dimensional geometric pattern is formed on a ground pattern of a coin which has conventionally only been finished with a plane finish, a mirror finish, or a pear finish. The ground pattern can be obtained, the brightness of the coin can be increased, and the decoration value or the play value of the coin can be increased.

Furthermore, if the pattern of characters, figures, and the like shown on the surface of the coin is formed in a V-shaped groove in the mold, the shine on the surface of the coin is further increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a manufacturing method of the present invention.

FIG. 2 is a view showing a coin obtained by the manufacturing method of the present invention, wherein (A) is a plan view, (B) and (C) are front sectional views.

FIGS. 3A, 3B, and 3C are plan views showing another example of a coin obtained by the manufacturing method of the present invention.

FIG. 4 is a front view showing the manufacturing method of the present invention.

FIG. 5 shows a character portion of a coin obtained by the manufacturing method of the present invention, wherein (A) is a plan view and (B) is a sectional front view.

FIG. 6 is a front view showing a method of manufacturing coins.

FIG. 7 is a front view showing a conventional manufacturing method.

FIG. 8 is a front view showing a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine 2 Die 3 Coin 4,7 Convex part 5 Plane engraving machine 6 Solid engraving machine 8 Ground pattern 9 Simultaneous three-axis control NC milling machine 10 V groove 11 Slope

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Claims (2)

[Claims] 1. A method for manufacturing coins used in an amusement park, wherein the coins are cut into a mold for expressing a pattern on a surface by pressing the coins in a thickness direction of the mold and in an oblique direction at an arbitrary angle. A simultaneous three-axis control NC milling machine is moved over the mold surface while repeating its cutting direction and depth in a fixed pattern, and this is repeated over the entire mold surface, so that a three-dimensional A coin manufacturing method characterized by obtaining a basic geometric pattern. 2. A method for manufacturing a coin according to claim 1, wherein a portion corresponding to a pattern such as a character or a figure emerging on the surface of the coin in the mold is cut into a V-groove by a simultaneous three-axis control NC milling machine. The method for producing coins according to claim 1, wherein