JPH0746426Y2 - Anode electrode for electrolytic deburring machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an anode electrode for an electrolytic deburring machine, which does not cause defective conduction and has a long service life.

(Prior Art) An electrolytic deburring machine has been used for a long time as one of means for removing burrs generated in a machined metal work. This electrolytic deburring machine is a device that opposes the work piece to the cathode electrode, contacts the work piece with the anode electrode and makes the work piece an anode, and applies a direct current while flowing an electrolytic solution to electrolyze the burr and elute it into the electrolytic solution. Is. This electrolytic deburring machine is widely used because it can surely remove burrs inside the work and the like.

However, the anode electrode used in this electrolytic deburring machine is electrolyzed and elutes itself when it comes into contact with the electrolyte solution, and is consumed in a very short time, making it insoluble in electrolyte solutions such as sodium nitrate. It has been made of titanium.
However, the conventional titanium-made anode electrode has a drawback that a passivation film is formed on the surface of the anode electrode, resulting in defective conduction, and smooth electrolytic deburring cannot be performed in some cases.

Therefore, the inventors of the present invention have devised an anode electrode in which the current-carrying characteristics are improved by plating the surface of the titanium electrode body with platinum, but when the work is a casting or a sintered metal, the anode electrode and the work are And are in point contact with each other. That is, a casting is a molten metal poured into a mold and solidified, and a sintered metal is a metal mold filled with metal powder, pressure-molded, and then sintered, so that the surface is rough. And has a relatively fine uneven shape. Therefore, it is inevitable that the contact between the anode electrode having a flat surface and the work becomes point contact. For this reason, when electricity is applied, sparks are generated on the contact surface between the anode electrode and the work to break the platinum plating layer, the molten titanium particles are ejected from there, the point contact state is further increased, and finally the platinum plating layer peels off. There was something that happened.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional drawbacks and is less likely to elute even when contacted with an electrolytic solution, and also causes defective conduction when a work is a casting or a sintered metal. The purpose of the invention is to provide an anode electrode for an electrolytic deburring machine without fear.

(Means for Solving the Problems) The present invention made to solve the above problems is made by contacting a work facing a cathode electrode with a titanium electrode body for passing a direct current using the work as an anode. In addition, a plate-shaped or rod-shaped platinum current-carrying member is provided so as to project from the contact surface with the work.

(Example) Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiment.

In FIG. 1, (1) is an electrode body made of titanium for contacting a work and supplying a direct current, and a concave groove (2) is formed on the contact surface with the work. Two rod-shaped platinum current conductors (3) are press-fitted into the groove (2) as shown in FIG. In this embodiment, the platinum conductor (3) has a thickness of 2 mm and a width of 5 mm.
It is projected about 1.5 mm from the surface. Further, the shape of the platinum current-carrying body (3) is arbitrary such as a cross-shaped shape as shown in FIG. 3, and its cross-sectional shape is also arbitrary. However, in any case, even if the width is made too thick, the function and effect will not change despite the increase in cost, so 2 mm or less is sufficient.

FIG. 4 shows how the anode electrode of the present invention is used.
(4) is a base, (5) is a cathode electrode attached to its upper surface, (6) is a work set table fixed on the base (4) via a plate (7), and the work (W) is It is set on the work set table (6) so as to face the cathode electrode (5), and a direct current is supplied while being pressed toward the work set table (6) by the above-mentioned anode electrode. In addition, the electrolytic solution supplied from the boss (8) on the lower surface of the base (4) flows upward through the gap between the cathode electrode (5) and the work (W) through the hole of the plate (7) as shown by the arrow, The burr in this part of the work (W) is electrolyzed and removed.

(Function) The anode electrode of the present invention thus constructed is made of titanium insoluble in the electrode body (1) for contacting the work piece facing the cathode electrode (5) and passing a direct current using the work piece as an anode. Since it is manufactured, it does not melt even when it comes into contact with the electrolytic solution as described above. Further, as in the prior art, the electrode body (1) made of titanium may have a passive film formed on the surface thereof to cause defective conduction of electric power to the work. In the present invention, however, a platinum electric conductor ( Since 2) is provided so as to project, contact with the work (W) is always performed by the platinum current conductor (2). As a result, the work (W) is a casting or a sintered metal, and the surface irregularities are large,
Even if a spark is generated, the platinum in the contact portion is not easily lost, so that stable energization is always possible.
Since the pressing force between the anode electrode and the work (W) acts concentratedly on the platinum current-carrying body (2), a larger contact pressure can be obtained, which is advantageous for improving the current-carrying characteristics.

(Effect of the Invention) As described above, the present invention makes contact with the work facing the cathode electrode (5), and contacts the work of the electrode body made of titanium for passing a direct current with the work as the anode. Since the platinum current-carrying member is provided on the surface, it has succeeded in preventing the elution of the anode electrode and preventing the occurrence of a current-carrying failure, and the stable electrolytic deburring can be performed for a long period of time. Therefore, the present invention has an extremely great practical value as an anode electrode for an electrolytic deburring machine, which eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a bottom view of another embodiment, and FIG. 4 is a sectional view showing a use state. (1): electrode body, (2): platinum current conductor.

Claims (1)

[Scope of utility model registration request] 1. An electrode body (1) for contacting a work facing a cathode electrode (5), and using the work as an anode for passing a direct current, is made of titanium, and has a plate on the contact surface with the work. An anode electrode for an electrolytic deburring machine, characterized in that a platinum or rod-shaped platinum current-carrying body (2) is provided in a protruding manner.