JPH06455Y2 - Stamping tool for electrolytic marking - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) This invention is a marking for electrolytic marking, which stamps a manufacturing number, a part number, a symbol, etc. on a metal product by utilizing the electroerosion effect of an electrochemical reaction of an electrolytic solution. It is about ingredients.

(Prior Art) FIGS. 4 and 5 show a conventional marking tool for electrolytic marking.

In FIG. 4, reference numeral 1 is a main body of a marking tool, and a water-repellent thin film 4 is attached to the front surface of the stamping metal 2 with a punching metal (perforated metal plate) 2 and a felt 3. This water-repellent thin film 4
As the stencil paper, a stencil paper for stencil printing or a material having characteristics similar to this is used.
5 is a conduit.

As shown in FIG. 5, the main body 1 also serves as a tank for the electrolytic solution 6, and the electrolytic solution 6 passes through the holes of the conduit 5 and the punching metal 2 to impregnate the felt 3. The electrolyte solution 6 is an electrolyte such as phosphoric acid, sulfuric acid, perchloric acid, etc.
It is a solution dissolved in an ionizing liquid such as alcohol, an alkaline solution, or a potassium cyanide solution. Further, the electrolyte solution 6 impregnated in the felt 3 is the water-repellent thin film 4
It is kept so as not to come into direct contact with the metal product 7.

Here, when a character or symbol is engraved at an arbitrary position on the water-repellent thin film 4 with a typewriter or iron brush, the character,
The symbol portion 4a becomes water permeable. Therefore,
The electrolytic solution 6 impregnated in the felt 3 leaches into the character and symbol portion 4a having the above water permeability, and comes into contact with the metal product 7 only in this portion.

A conductor 8 is connected to the punching metal 2, and the conductor 8 connects the switch 9, the resistor 10 and the power source 1.
It is electrically connected to the metal product 7 via 1. Therefore,
When the switch 9 is closed, a closed circuit of the metal product 7, the letters of the water-repellent thin film 4, the symbol portion 4a, the felt 3, the punching metal 2, the conductive wire 8, the switch 9 and the resistor 10 is formed from the power source 11 and the current flows. , The character and symbol part 4a
An electrochemical reaction of the electrolytic solution 6 occurs on the surface of the metal product 7 which contacts with. Due to this electrochemical reaction, the surface of the metal product 7 is electro-eroded and the gloss of the part changes,
Characters and symbols can now be identified with the naked eye and marking is possible.

By the way, the water-repellent thin film 4 used for the above-mentioned conventional marking tool for electrolytic marking has a short life, and although it depends on the material, it usually needs to be replaced several times or several hundred times. In addition, when imprinting consecutive serial numbers etc.,
Each time, the water-repellent thin film 4 having a different number must be created, stamped once, and discarded. Therefore, not only is it troublesome to make and replace the water-repellent thin film 4, but it is uneconomical. Further, the main body 1 of the marking tool
Is a tank for the electrolytic solution 6, and moreover, the main body 1
Since the punching metal 2 and the felt 3 must be attached to the stamping tool, the marking tool itself becomes large in size, which makes it difficult to stamp a small part or a narrow portion.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned circumstances. The purpose of the invention is to reduce the size and cost of the marking tool by omitting the use of the electrolyte tank, felt and punching metal, and to simplify the marking work. Electrolysis that can be easily stamped on small products, narrow parts, and even those with some unevenness or curvature on the surface, and has a large mechanical strength, which can be effectively used as a rotation mark. It is intended to provide a marking tool for marking.

(Structure of the Invention) In order to achieve the above object, the marking tool for electrolytic marking according to the present invention is a marking tool for electrolytic marking which performs marking by electrically eroding the surface of a metal product by an electrochemical reaction of an electrolytic solution. , A conductive rubber stamp is formed on the surface of the conductive rubber by forming a convex portion capable of adhering an electrolytic solution on the surface through a stamp pad, and an electrode is provided on the back surface of the conductive rubber stamp. An insulating member is provided around the conductive rubber stamp so that the conductive rubber stamp does not come into contact with the metal product, and the conductive rubber stamp is housed and supported by the holder.

According to the above configuration, it is possible to reduce the size of the marking tool itself by using a conductive rubber stamp having a long life and eliminating the need for an electrolytic solution tank or a felt impregnated with the electrolytic solution. Further, since the rubber stamp itself has conductivity, and the current is applied to the rubber stamp, it is only necessary to attach the electrolytic solution using the stamp pad to the convex portion of the rubber stamp,
It is not necessary to impregnate the electrolytic solution, so that it is not necessary to use a porous substance as a constituent material of the rubber stamp, and it is possible to increase the mechanical strength, especially the tensile strength of the rubber stamp. As a result, the present invention can be applied to a structure in which a large tensile force is applied during use, such as a rotation mark. Furthermore, by providing an insulating member that prevents the peripheral portion of the conductive rubber stamp from coming into contact with the metal product, it is possible to provide the metal product with a protective function for preventing unnecessary marking.

(Embodiment) FIG. 1 to FIG. 3 show a marking tool for electrolytic marking according to an embodiment of the present invention. The same parts as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numeral 20 denotes a rubber stamp having a convex portion 20a formed on the surface of a conductive rubber so as to correspond to a desired marking such as letters and symbols. This conductive rubber is
A rubber material, such as natural rubber or synthetic rubber, mixed with a metal, a Group 4 element, or the like, is a rubber through which electricity flows, that is, a rubber having an electron transfer mechanism. Rubber stamp 20
An electrode 21 made of a conductive material such as metal is in contact with the back surface of the electrode, and the conductor 8 (see FIG. 2) is connected to the electrode 21. The rubber stamp 20 is an insulator cover 2
It is fixed to the holder 23 by 2. The cover 2
The reference numeral 2 also serves as a protective cover so that the peripheral portion of the rubber stamp 20 does not come into contact with the metal product 7 (see FIG. 2) and unnecessary marking is not made. Reference numeral 24 is a screw for fixing the cover 22 to the holder 23.

Now, as shown in FIG. 2, the electrolytic solution 6 is applied to at least the convex portion 20 of the rubber stamp 20 by a stamp pad (not shown).
It is attached to a and pressed against the metal product 7. After that, when the switch 9 is closed, the metal product 7, the electrolytic solution 6, the convex portion 20a of the rubber stamp 20, the rubber stamp 20, the electrode 2 are fed from the power source 11.
1, a closed circuit of the switch 9 and the resistor 10 is formed and a current flows. At this time, the electrolytic solution 6 adhering to the surface of the metal product 7 from the convex portion 20a formed on the characters and symbols on the surface of the rubber stamp 20 causes an electrochemical reaction at the adhering portion. In this way, the portion of the surface of the metal product 7 to which the electrolytic solution 6 is attached is electrically eroded, and characters, symbols, etc. are marked.

In the above structure, the conductive rubber stamp 20 has a very long life as compared with the conventional water-repellent thin film, so that the labor for replacement is reduced and it is economical. Further, since the tank for the electrolytic solution 6 and the felt impregnated with the electrolytic solution 6 are unnecessary,
The marking tool itself is small, and it is easy to mark small parts or narrow parts.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the rubber stamp 30 made of a conductive rubber is used as a rotary stamp by forming a ring-shaped band on the outer periphery of which convex portions 30a corresponding to desired markings such as letters and symbols are formed. Reference numeral 31 denotes an insulator stopper, which prevents unnecessary marking from being made by the peripheral portion of the rubber stamp 30 coming into contact with the metal product 7 (see FIG. 2). Further, in this embodiment, the supporting members 32 and 33, which serve as holders for accommodating and supporting the conductive rubber stamp 30, are made of a conductive material such as metal, and the conducting wire 8 is connected thereto. Therefore, the support members 32 and 33 are provided on the rubber stamp 30 and a part of the electric circuit.
Also plays the role of an electrode.

As described above, when the conductive rubber stamp 30 is used as a rotary stamp, it is not necessary to replace the rubber stamp when printing a continuous serial number, so that the work is simple and economical.

In the embodiment shown in FIG. 1, the cover 22 is attached to the holder 2.
Although the screw 24 is used as a means for attaching to the device 3, other suitable attaching means such as providing a locking portion on the cover 22 and the holder 23 may be used.

(Effect of the Invention) As described above, according to the present invention, the conductive rubber stamp is used, and the use of the electrolytic solution tank or the felt impregnated with the electrolytic solution is omitted. Can be achieved, making the marking work easier and
It is possible to easily mark small products and narrow areas. Moreover, since the rubber stamp itself has conductivity, and one of the electrodes is used as an electrode to cause a current to flow through the rubber stamp, the electrolyte solution can be attached simply by using a stamp pad on the convex portion of the rubber stamp. Since it is not necessary to retain the stain, it is not necessary to use a porous substance as a constituent material of the rubber stamp, and the mechanical strength of the rubber stamp, particularly the tensile strength, can be increased. As a result, it can be sufficiently used for a structure having a large tensile force applied during use, such as a rotation mark.
In addition, by providing an insulating member that prevents the peripheral part of the conductive rubber stamp from coming into contact with metal products, it is possible to prevent unnecessary marking on metal products and to always perform beautiful marking. it can. Furthermore, since the rubber stamp is elastic, it does not have to be a strict flat surface as long as it is within the elastic deformation range of the rubber stamp, and even for metal products with some irregularities or changes in curvature on the surface, The marking has a practical effect that the marking can be performed and the appropriate range can be expanded.

[Brief description of drawings]

FIG. 1 is a perspective view showing a marking tool for electrolytic marking according to an embodiment of the present invention, FIG. 2 is a longitudinal side view of the same, FIG. 3 is a perspective view showing another embodiment, and FIG. FIG. 5 is a perspective view showing a marking tool for electrolytic marking, and FIG. 5 is a longitudinal side view of the same. 6 ... Electrolyte, 7 ... Metal product, 20, 30 ... Conductive rubber stamp, 20a, 30a ... Convex part, 21 ... Electrode, 22 ... Insulator cover, 23 ... Retainer, 31 ... Insulator stopper, 3
2, 33 ... Support member (an example of a holder).

Claims (1)

[Scope of utility model registration request] 1. A marking tool for electrolytic marking, in which a surface of a metal product is electrically eroded for marking by an electrochemical reaction of an electrolytic solution, which corresponds to a desired marking on a surface of a conductive rubber, and a stamp pad is used for the marking. Equipped with a conductive rubber stamp formed by forming a convex part to which electrolyte can be attached on the surface,
While contacting the electrode on the back of this conductive rubber stamp,
A marking tool for electrolytic marking, characterized in that an insulating member is provided around a peripheral portion of the conductive rubber stamp to prevent the peripheral portion from coming into contact with a metal product, and the conductive rubber stamp is housed and supported in a holder. .