JPS5835823B2 - Electrolytic buffing processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention consists of a dissolving action in which an anodic polished object is removed from an electrolytic bath, and a polishing action in which an abrasive removes a passivated oxide film formed on the surface of the polished object. The present invention relates to an electrolytic puff polishing device that combines the following.

Conventionally, a widely used method for finishing the surface of materials such as stainless steel to a mirror finish is to immerse the object to be polished and an electrode facing each other in an electrolyte bath, and apply a DC voltage to both to perform electrolytic polishing. .

However, this method electrochemically removes and forms the anodic passivation oxide film that forms on the surface of the object to be polished, and preferentially electrolytically elutes the convex portions of minute irregularities on the surface of the object to be polished. Since the surface is smoothed and a mirror surface is obtained, the current density is limited to 0.2 to 0.7 A/cn.
Only a small current density can flow.

In addition, in addition to being subject to severe restrictions on the composition and temperature of the electrolyte,
There are problems such as the occurrence of pits due to non-uniform current density.

Therefore, for these reasons, although it is effective as a surface treatment method for relatively small objects (small area), it is difficult to put it into practical use when finishing the surface of a large area, for example, a large can manufacturing object.

Therefore, one method to solve these drawbacks is to mechanically remove the passivated oxide film that forms on the surface of the object to be polished by using an abrasive, and apply the electrolytic current to the minute irregularities on the surface of the object to be polished. An electrolytic puff polishing method in which the electrolyte is selectively extracted from the convex portions by concentrating the electrolyte on the convex portions has been proposed as a very effective mirror finishing method.

The present invention provides a processing device that enables the above-mentioned electrolytic puff polishing to be carried out even more effectively.The present invention will now be described in detail with reference to drawings showing embodiments thereof.

First, FIG. 1 shows the shape of a conventional tool electrode. In the figure, 1 is a tool connected to a drive shaft and rotated by a drive device, and 2 is a disk-shaped electrode formed at the bottom of the tool 1. ,
3 is a conductive exposed electrode formed in the shape of a cross on a disc-shaped electrode; 4 is a plurality of electrolyte outlet ports provided concentrically in the center of electrode 2; 5 is a disc-shaped electrode 2 is an insulating film coated on the entire surface except for the exposed electrode 3, and also serves as an adhesive for adhering to an abrasive material such as an abrasive cloth.

In this invention, the shape of the exposed electrode 3 shown in FIG. 1 is changed to a curved shape as shown in FIG.
FIG. 3 is a sectional view of FIG. 2.

That is, in the disc-shaped electrode 2 of the tool 1, the exposed electrode 6 for electrolysis is formed in a shape that is curved backward in the direction of rotation of the electrode 2 from each outlet 4 toward the outer circumference of the electrode 2. .

Exposed electrodes 6 and abrasive materials 8 are provided alternately in the rotational direction of the tool 1 on the processing surface of the tool 1, and an electrolytic solution 7 is provided on the processing surface of the tool 1.
is pumped through the drive shaft and flows from the outlet 4 through the abrasive material 8 to the outside of the tool 1.

Further, in order to prevent leakage current from flowing from the tool 1 through the electrolyte 7, an insulating film 9 is applied to the circumferential surface of the tool 1.

Further, the cathode side and the anode side of a direct current or pulse power source are respectively connected to the tool 1 and an object to be polished (not shown) placed opposite to the lower surface of the tool.

During the polishing process, a direct current or pulse voltage is applied to the electrode 2 of the tool 1 and the object to be polished, while the electrolyte 7 is pumped and supplied in the meantime, and the tool 1 is pressed against the object to be polished, as shown in FIG. By rotating in the direction of the arrow, the metal of the polished object is electrolytically eluted by electrolytic action, and the passivation oxide film generated on the surface of the polished object is removed by abrasive material 8, and the surface of the polished object is removed. It is possible to preferentially and selectively promote electrolysis on the convex portions of the concave and convex portions, and the surface of the object to be polished can be finished to a mirror finish.

A major feature of this invention is that the shape of the exposed electrode 6 is designed in consideration of the relationship between the outflow speed of the electrolyte and the rotational speed of the tool, so that the electrolyte flows from the outflow port 4 toward the outer circumference of the electrode 2 as the tool 1 rotates. Because the electrode 2 bends backward in the direction of rotation,
The shape of the exposed electrode 6 is curved backward in the direction of rotation of the electrode 2 from each outlet 4 toward the outer circumference of the electrode 2 so as to follow the curved flow of the electrolyte. On the other hand, the electrolytic solution flows almost uniformly, the electrolytic current density becomes uniform, and the electrolytic eluate can be easily discharged.

This allows the electrolytic solution in the gap between the tool and the object to be polished to be kept clean at all times, so that the electrical conductivity of the electrolytic solution can be used at its best.

Therefore, during electrolytic puff polishing, the electrolytic action is performed stably, so the polishing efficiency increases, and according to this invention, the polishing speed is 20 to 4 times faster than that of the conventional method.
I was able to raise it by 0φ.

As described above, according to the electrolytic puff polishing device of the present invention, the exposed electrode for electrolysis is curved backward in the rotational direction of the electrode from the outlet toward the outer circumference of the electrode, thereby increasing the polishing speed. This will dramatically improve efficiency.

[Brief explanation of drawings]

FIG. 1 is a bottom view of a conventional tool electrode, FIG. 2 is a bottom view of an electrode of an example of the electrolytic puff polishing apparatus of the present invention, and FIG. 3 is a sectional view of the tool shown in FIG. 2. 1...Tool, 2...Electrode, 4...
...Outlet, 5...Insulating film, 6...
Exposed electrode, 7... Electrolyte, 8... Abrasive material.

Claims (1)

[Claims] 1. Conductive exposed electrodes and abrasive material are provided alternately in the rotational direction of the tool on the machined surface of the tool, and the anodic polished object is electrolytically eluted by electrolysis, and the passivation generated on the surface of the polished object is electrolytically eluted. In an electrolytic puff polishing device that finishes the surface of the object to be polished to a mirror finish, the tool A plurality of electrolyte outflow ports are formed concentrically in the center of the electrode, and an exposed electrode for electrolysis is curved backward in the rotational direction of the tool electrode from each outflow port toward the outer circumference of the tool electrode. An electrolytic puff polishing processing device characterized by forming.