JPS5837103B2 - Electrolytic buffing method - Google Patents

Description

Detailed Description of the Invention This invention combines the elution of anode metal by electrolytic action, the generation of a passivating oxide film, and the polishing action of an abrasive material, thereby producing a mirror-like finish on the surface of stainless steel, etc. Relating to a puff polishing method.

Next, this invention will be explained in detail with reference to the drawings showing one embodiment thereof.

The electrolytic puff polishing method of the present invention is roughly divided into a polishing section A and a power supply section B, and 1 is a disk-shaped tool electrode of the polishing section A;
2 is an abrasive material such as a puff or abrasive cloth attached to the lower surface of the tool electrode 1 with adhesive or the like, and is electrically insulated from the tool electrode 1, and is connected to the radially exposed exposed electrode surface of the tool electrode 1 and the abrasive material. 2 are formed alternately in the direction of rotation of the tool electrode 10, and the area of the abrasive material 20 is 1/2 of the total area of the tool electrode 1.
It is provided so that the ratio is 4/5 to 4/5.

3 is an object to be polished facing below the tool electrode 1 with a required gap, 4 is a cylindrical main shaft with the tool electrode 1 attached to the lower end, 5 is a gear formed on the outer periphery of the main shaft 4, and 6 is a gear 5
The gear 7 that meshes with the gears 6 and 5 decelerates or accelerates the tool electrode 1 along with the main shaft 4 by 200 to 500 rpm.
A drive source such as an electric motor or an air motor that rotates at a speed of m,
A brush 8 is connected to the cathode side of the power supply section B and comes into sliding contact with the main shaft 4, and the anode side of the power supply section B is connected to the object 3 to be polished.

A detector 9 detects the number of rotations or the rotation speed of the tool electrode 10, and supplies a signal to the power supply section B when the rotation speed of the tool electrode 10 abnormally decreases to a predetermined value or less.

10 is a rotary seal provided on the upper part of the main spindle 4, and the electrolytic solution mixed with abrasive grains is passed through the main spindle 4 to the tool electrode 1.
and the object to be polished 3.

Reference numeral 11 denotes a stop valve for supplying and stopping electrolyte to the rotary seal 10.

Reference numeral 12 denotes a DC power source of the power supply unit B consisting of a power transformer and a rectifier, and as described above, the anode side is connected to the object to be polished 3 through the switch 13, and the cathode side is connected to the tool electrode 1 through the brush 8.
It is connected to the.

14 is an overcurrent detector that detects overcurrent of the DC power supply 12, and outputs a signal when a current exceeding a predetermined value flows;
It is configured to open the opening/closing part 13.

Further, the switch 13 is also opened by a signal from the detection section 9 of the polishing section A.

Next, the operation of the apparatus of the above embodiment will be explained.

The electrolyte is supplied to the gap between the tool electrode 1 and the object to be polished 3 via the stop valve 11, the rotary seal 10, and the main shaft 4, and the electrolyte is supplied to the tool electrode 1 via the gears 6, 5 and the main shaft 4 by the driving source 7. is rotated, and an electrolytic DC voltage is applied from the DC power source 12 between the exposed electrode of the tool electrode 1 and the object 3 to be polished, and the metal of the object 3 to be polished is eluted by electrolytic action, and the object 30 to be polished is eluted by electrolytic action. A passivating oxide film is formed on the surface irregularities.

Of this passivated oxide film, only the convex portions of the passivated oxide film are removed by the abrasive material and the abrasive grains in the electrolyte, and the electrolytic action is concentrated on the convex portions, and the surface of the object to be polished is Finished with a mirror finish.

By the way, the relative speed between the tool electrode 1 and the object to be polished 3, that is, the rotational speed (peripheral speed) of the tool electrode 10, abnormally decreases,
When the predetermined Q speed decreases to 20 m/IIIin (50 rpm) or less when the major axis of the tool electrode 1 is between 150 and 150, for example, the detector 9 of the polishing section A issues a signal and the switch 13 of the power supply section B is opened.

This is because when the rotational speed of the tool electrode 10 decreases below 20 m/s, the electrolytic action becomes excessive compared to the polishing action by the puff and abrasive grains, and the polished surface becomes rough. This is based on experimental results.

Further, when the rotation of the tool electrode 10 stops, abnormal metal elution occurs locally on the surface of the object 30 to be polished.

On the other hand, when a current exceeding a certain value, that is, an overcurrent flows between the tool electrode 1 and the object to be polished 3, the overcurrent detector 14 issues a signal and opens the switch 13.

Due to this overcurrent, the surface of the object to be polished 30 is roughened,
Alternatively, this is because defects occur due to a short circuit between the tool electrode 1 and the object to be polished 3.

As described above, according to the electrolytic puff polishing method of the present invention,
An exposed electrode surface and an insulating and flexible polished surface are alternately formed on the tool electrode, and a DC voltage is applied between the tool electrode and the anodic polished object, and the polished surface of the tool electrode is brought into contact with the polished surface. The polished surface removes the passivated oxide film only on the convex portions of the passivated oxide film formed on the uneven portions of the surface of the polished object by electrolytic action by sliding while pressing on the polished object; By concentrating the electrolytic action on the convex portion on the surface of the proboscis to be polished, and when the relative speed between the tool electrode and the object to be polished is abnormally reduced, the aforesaid mole current voltage is cut off, so that the polished surface is In addition, abnormal metal elution is prevented, electrolytic puff polishing of stainless steel and the like can be effectively performed, and the surface of the polished object can be finished to a mirror finish.

[Brief explanation of drawings]

The drawing is a partial sectional view of one embodiment of the electrolytic puff polishing method of the present invention. 1... Tool electrode, 2... Abrasive material, 3...
...Object to be polished, 9...Detector, 12...
Curved DC power supply, 13... Switch, A...
Polishing section, B...Power supply section.

Claims (1)

[Claims] 1 Alternately forming exposed electrode surfaces and insulating and flexible polished surfaces on the tool electrode, applying a DC voltage to the tool electrode and the anodic polished object, and applying the polished surface of the tool electrode to the polished surface. The polishing surface slides while pressing on the object to be polished, and among the passivated oxide films formed on the uneven parts of the surface of the object to be polished due to electrolytic action, the passivated oxide film only on the convex parts is removed by the polishing surface, Electrolytic puff polishing, characterized in that electrolytic action is concentrated on the convex portions on the surface of the object to be polished, and when the relative speed between the tool electrode and the object to be polished is abnormally reduced, the DC voltage is cut off. Method.