JPS6358229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses the inner diameter of the hollow part as a screening limit value, and inserts the article into the hollow part to determine the thickness of the article.
The present invention relates to a method of manufacturing a sorting gauge used for sorting outer diameter dimensions such as width.

The performance required for a sorting gauge through which objects such as coins are inserted is (1) the accuracy of the inner diameter of the hollow part (1/1000 to 5/1000 mm for high precision applications, 2/100 to 3/100 mm for general applications); (2) Inner diameter perpendicularity, (3) Inner diameter angle R, (4) Inner surface finish accuracy, (5) Inner surface hardness (wear resistance), (6) Corrosion resistance, (7) Sorting gauge itself. These include strength, (8) ease of installation when attaching the sorting gauge to a structure such as a housing, (9) economic efficiency, and (10) mass productivity.

High-precision sorting gauges require the aforementioned high dimensional accuracy, so they are often polished, and the method used is to manufacture them by combining quenched steel or copper alloy that has been polished into blocks. . However, with this method, (a) the polishing work is difficult, (b) it is extremely difficult to maintain accuracy and the assembly work is complicated because many divided blocks are assembled, and (c) when the length of the sorting gauge is long. It has disadvantages such as difficult to manufacture due to dimensional accuracy, (d) hard chrome plating may be applied to improve corrosion resistance, and polishing is required, making it expensive and unsuitable for mass production. It was hot.

In addition, general sorting gauges are manufactured by attaching a flat plate to the open side of a member formed into a U-shaped cross section by cutting, drawing, extrusion, forging, or other methods.

As an example of such a conventional sorting gauge, an example of a coin sorting gauge used as a coin slot in a vending machine, a public telephone, etc. is shown in a perspective view in FIG. 1 and a plan view in FIG.

In the figure, 1 is a member formed by cutting or other methods to have a U-shaped cross section, and 2 is a flat plate fixed to the open side of the U-shaped member 1 with a fixture 3. A gauge hollow part 4 for inserting a coin is formed between the letter-shaped member 1 and the flat plate 2.

However, with this method, (a) the U-shaped member and the flat plate are combined, which requires additional machining and assembly work to attach the flat plate, and (b) the selection gauge is not made of stainless steel due to its strength and corrosion resistance. (c) If extruded shapes are used, the inner diameter angle R becomes large; (d) Brass materials, which are suitable for cutting and drawing, have poor wear resistance; There were disadvantages such as: Hard chrome plating was required to improve corrosion resistance, which resulted in poor dimensional accuracy; (e) Cutting, assembly, and hard chrome plating required high costs, making it unsuitable for mass production. .

Another drawback is that when the above-mentioned sorting gauge is attached to a structure such as a housing, an auxiliary member is required for the attachment.

The present invention was made in view of the above circumstances, and unlike conventional sorting gauges, does not require complicated processes such as polishing and assembly, is low in cost, is suitable for mass production, and is suitable for use in structures such as casings. The object of the present invention is to provide a method for manufacturing a sorting gauge that does not require any special auxiliary tools for installation and that meets any requirements such as high precision or general use.

EMBODIMENT OF THE INVENTION Hereinafter, based on drawings, the manufacturing method of the selection gauge of this invention will be specifically demonstrated by taking the selection gauge used for hardening input ports, such as a public telephone and a vending machine, as an example.

First, as shown in FIG.
For example, an aluminum flat plate with an elongated rectangular cross section is machined or otherwise processed so that the cross section has a sorting limit dimension slightly larger than the diameter and thickness of the coins to be sorted. A gauge forming matrix 10 is obtained. Next, as shown in FIG. 4, zinc substitution is performed on the surface of this gauge forming matrix 10 to enable metal electrodeposition to form a zinc substitution layer 11, and then to improve adhesion, a zinc substitution layer 11 is formed. After applying the copper plating 12, as shown in FIG. 5, a first electroformed metal layer 13 is formed by electroforming on the surface of the copper plating 12 to have an appropriate thickness.
The first electroformed metal layer 13 is obtained by forming an electroformed layer 13a of nickel, and then forming an electroformed layer 13b of copper on the outer periphery thereof.

Next, metal rods (copper) 14, 14 are placed on both sides of the first electroformed metal layer 13. What is the outer periphery of these metal rods 14, 14 and both sides of the first electroformed metal layer?
A conductive adhesive made of a metal such as Sn-Pb solder or conductive paste that does not melt when the matrix is removed is used to bond the two so that they are surface-bonded. The electroformed metal layer 13 is formed so as to eliminate a large change (indentation) in the outer circumferential shape at the junction between the outer circumferential surface and the circular metal rods 14, 14, that is, to make the outer circumferential shape substantially uniform. However, as long as the mounting portion is strong enough, a small amount may be sufficient so that only a slight surface contact occurs and no sharp corners are formed; however, in this case, a slight depression will be formed in the final shape.

Next, the first electroformed metal layer 1 formed in this way
3. A second electroformed metal layer 16 of copper is formed by electroforming so as to integrally cover the conductive adhesive 15 and the outer circumferences of the metal rods 14, 14. In forming the second electroformed metal layer 16, the potential distribution at the joint between the first electroformed metal layer 13 and the metal rods 14, 14 during growth of the metal layer by electroforming is made uniform, so that the second electroformed metal layer 16 is formed. As shown in FIGS. 7 and 8, the electroformed metal layer 16 develops substantially uniformly over time, resulting in a second electroformed metal layer having a substantially uniform thickness throughout.

In general, in electroforming, if there is a large change in the outer circumferential shape of the electrodeposited object, current concentration will occur at the protruding part as a result of the change, so the electroformed layer will develop into a significantly thicker layer around the protruding part, and sharp corners will be formed. Almost no metal layer is developed in the depressions forming the grooves, and therefore deep grooves are formed in the depressions. Therefore, the first
If there is a large depression 17 at the joint between the electroformed metal layer 13 and the metal rods 14, 14 as shown in FIG. 18 is formed in a V-shape, and therefore the strength of the groove 18 portion is weak, making it easy to crack or break from this portion. In particular, as a sorting gauge to which an excessive external force may be applied when coins are inserted, the tendency to crack is a fatal drawback, which is undesirable. Therefore, as described above, the conductive adhesive 15 is used to bring the first electroformed metal layer 13 and the metal rod 14 into surface contact via the conductive adhesive, so that the outer circumferential shape is made uniform. In this case, an acute V-shaped portion is not formed, the strength against external forces is increased, and a gauge that can be used as a sorting gauge can be obtained.

Next, the material coated with the second metal layer 16 formed by copper electroforming is cut into appropriate lengths in the axial direction, for example, 10 cm, and heated in a 20% sodium hydroxide solution at a temperature of 70 to 80°C to form a gauge forming matrix. 10 is dissolved and removed, the zinc substitution layer 11 is further dissolved and removed with hydrochloric acid, the copper plating 12 is dissolved and removed with a chemical polishing solution, and mounting holes 19, 19 are drilled in the mounting portions on both sides.
As shown in the figure, a gauge hollow part 4 is formed in the first electroformed metal layer 13, and the first electroformed metal layer 13
A sorting gauge 21 is obtained in which mounting portions formed by the second electroformed metal layer 16 are formed on both sides of the screen.

In addition, instead of the metal rod, a mother mold for forming the mounting holes consisting of an aluminum rod with a circular cross section is used, and after the formation of the second electroformed metal layer, it is removed together with the mother mold for forming the gauge, and the mounting holes are removed. may be formed. In this case, a zinc substitution layer and a copper plating layer are formed in advance on the mother die for forming the mounting holes, as in the case of the mother die for forming the gauge.

Note that the material for the gauge forming matrix and the mounting part forming matrix is not limited to aluminum, and various other materials such as low melting point metals may be used, and the matrix may be removed by drawing or other means. It's good to wear.

Furthermore, although the present invention has been explained with reference to an embodiment of a coin sorting gauge used as a coin input slot member, the shape of the matrix is not limited to a rectangular cross section, but can be formed in any other shape such as a circle. It is also possible to form a hollow part for a gauge in various shapes such as a circle, and it goes without saying that the present invention can be implemented not only in a coin sorting gauge but also in various shapes of sorting gauges for other types of uses.

According to the present invention, (a) the inner diameter dimensional accuracy is determined by the accuracy of the gauge forming matrix;
It can meet any request such as for general use, and even for high precision use, it is possible to improve the accuracy of the master mold, so it is significantly improved compared to conventional ones. The surface finishing accuracy is also the same as above, and (c) for example, by forming the first metal layer by nickel electroforming, the inner surface hardness (wear resistance) can be improved, and (d) the conventional There is no need for complicated work such as assembling blocks or assembling a U-shaped member and a flat plate as in the case of the sorting gauge, and there are no problems with accuracy caused by this work. (e) Also, since the mounting part for attaching to a structure such as a casing is integrally provided, there is no need for auxiliary parts or processing for conventional mounting.
Installation becomes significantly easier. (f) In addition, since polishing, hard chrome plating, and assembly are not required, the cost is low and suitable for mass production, especially for long mother molds.
If rods, pipes, etc. are used, a large number of screening gauges of appropriate length can be obtained after electroforming their surfaces.

Further, according to the manufacturing method of the present invention, since the first electroformed metal layer and the mounting member are bonded using a conductive adhesive, the mounting member during the second electroforming is bonded to the second electroformed metal layer. There is no need to tie it with a string in order to make it adhere tightly to the metal layer, which increases adhesive strength, eliminates the formation of peculiar deep grooves due to electroforming, and has the advantage of increasing the strength of the final shape of the sorting gauge.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional sorting gauge for a coin slot, and FIG. 2 is a plan view thereof. 3rd to 8th
The figures are diagrams for explaining the selection gauge connection method of the present invention, in which FIG. 3 is a perspective view showing a gauge forming matrix, and FIG. 4 is a gauge forming matrix with zinc substitution,
5 is a sectional view showing the state in which the first electroformed metal layer is formed, and FIG. 6 is a sectional view showing the state in which the first electroformed metal layer is formed. FIG. A sectional view showing a state in which the cast metal layer is adhered to the side part with a conductive adhesive, and FIGS. 7 and 8 are sectional views showing a state in which a second electroformed metal layer is formed. Figures 9 to 11 are diagrams for explaining inconveniences that are likely to occur when the present invention is put into practice, and Figure 9 shows a metal rod formed by forming an acute-angled recess on the side of the first electroformed metal layer. 10 and 11 are cross-sectional views showing a state in which the second electroformed metal layer is formed from the state shown in FIG. 9. FIGS. FIG. 12 is a plan view showing a sorting gauge obtained by the connection method of the present invention. 4... hollow part for gauge, 10... mother mold for gauge formation, 13... first electroformed metal layer, 14... metal rod, 15... conductive adhesive, 16... second electroforming Metal layer, 19... hole, 21... sorting gauge.

Claims (1)

[Claims] 1. A first electroformed metal layer is formed by electroforming on the outer periphery of a gauge forming mother mold for forming a hollow part for a gauge having a screening limit value dimension, and at least the outer periphery for forming a mounting part is formed by electroforming. A mounting member made of an electrically conductive material is adhered to the outside of the first electroformed metal layer using a conductive adhesive so as to form a surface bond, and then an electric current is applied to the outer periphery of the first electroformed metal layer and the mounting member. After forming the second electroformed metal layer by casting so that the first electroformed metal layer and the mounting member are integrally covered, the gauge forming matrix is removed, and a part or part of the mounting member is removed. A method for manufacturing a sorting gauge, characterized in that a sorting gauge is obtained by removing the entire part and forming a mounting hole.