JPS6047359B2 - Mirror finishing method using electrolytic composite polishing - Google Patents

Description

[Detailed Description of the Invention] This invention combines the polishing action of electrolysis and the abrasion action of abrasives and abrasive grains, making it possible to easily finish a mirror surface with good gloss and no scratch marks. This article relates to a method for raising mirror surfaces by electrolytic composite polishing.

Next, the present invention will be described in detail with reference to drawings showing embodiments thereof. In the drawing, 1 is a mounting seat with a circular cross section formed at the lower end that is rotated by the drive mechanism, 4 is an inward taper formed on the lower circumferential surface of the mounting seat 3, and 5 is attached to the lower surface of the mounting seat 3. It has a disk-shaped electrode, and an electrode surface and an insulating surface covered with an insulator are alternately formed radially on the lower surface.

Reference numeral 6 indicates a plurality of through holes formed radially through the electrode 5, 7 indicates a liquid-permeable and insulating felt-like cushioning material pasted on the lower surface of the electrode 5, and 8 indicates a liquid-permeable and insulating paper. This is a sheet-like abrasive material such as, to which abrasive grains are fixed, and an abrasive material 8 is applied to the lower surface of the cushioning material 7.

9 is a circular ring whose inner diameter is slightly larger than the outer diameter of the circumferential surface of the mounting seat 3; 10 is a contact portion formed protruding from the inner surface of the ring 9; and 11 is an inner portion formed below the contact portion 10. The inclination of this taper 11 is slightly smaller than the inclination of the taper 4 of the mounting seat 3.

12 is a slit formed in a horizontal direction in a part of the ring 9, and a part of the ring 9 is divided into an upper part 13 and a lower part 14, and the upper part 13 is divided into a left piece 16 and a right part 17 by a notch 15. has been done.

18 is a notch formed near the end of the right piece 17, and 19 is a screw inserted into the end surface of the right piece 17 from the notch 18 and screwed into the left piece 16.

The abrasive material 8 attachment means applies the abrasive material 8 to the lower surface of the buffer material 7 and inserts the ring 9 into the mounting seat 3 from below.

At this time, the peripheral edge of the abrasive material 8 is bent upward by the inner surface of the ring 9 and lifted upward, and the contact portion 10 slides on the taper 4 of the mounting seat 3 via the abrasive material 8. The contact portion 10 presses against the taper 4 via the abrasive material 8. Then, the right piece 17 of the ring 9 is tightened with the screw 19.
and the left piece 16 to secure the ring 9 to the mounting seat 3. At this time, the abrasive material 8 has no looseness or wrinkles, and is polymerized onto the electrode 5 via the buffer material 7, thereby imparting uniform tension.

Then, an abrasive material 8 to which abrasive grains with an abrasive grain diameter of 6 μm or less are fixed.
is pressed against the surface to be polished 20, and the electrolytic solution is applied to the electrode 5 and the surface to be polished 20 through the center hole 2 of the rotating shaft 1 and the through hole 6 of the electrode 5.
A DC power supply of 4 to 7 V is supplied between the
is applied, and while maintaining the gap between the electrode 5 and the surface to be polished 20 in the order of 2 to 3, the rotating shaft 1 is heated to 100 to 200 rr1, Im.
By rotating at a speed of jn and performing electrolytic composite polishing, the surface to be polished 20 can be finished to a mirror surface. Next, the experimental results will be explained.

FIG. 4 shows the electrode 5 and the polished surface 20 under the polishing conditions.
This figure shows the change in roughness of the surface to be polished 20 when the gap between the two surfaces is 2.5 Wf1 and the DC power source is 3 to 8 V.

As is clear from the figure, when the DC power supply is 4 to 7 V, a mirror finish with good gloss and no streaks is achieved, and when the DC power is 4 V or less, there is little anode elution from the object to be polished due to electrolysis, and there are no streaks caused by abrasive grains. remains, and if the voltage exceeds 7V, the polished surface becomes cloudy due to adhesion of oxides, excessive electrolysis, etc., and the polished surface deteriorates. Next, FIG. 5 shows the roughness obtained by changing the diameter of the abrasive grains fixed to the abrasive material 8. As is clear from the figure,
By using abrasive grains of 6μm or less, 0.1μTrL
A mirror surface of Rmax or less can be obtained. As described above, according to the mirror finishing method using electrolytic composite polishing of the present invention, a high-quality mirror surface without surface defects such as bits and scratches can be easily obtained, and productivity is high and advanced technology is not required. .

Furthermore, since the abrasive grains are fixed to the abrasive material, it is difficult for the abrasive grains to mix into the electrolyte, making it easy to manage the electrolyte.
The sheet abrasive material can also be easily replaced.

[Brief explanation of drawings]

The drawings show an embodiment of the mirror finishing method using electrolytic composite polishing of the present invention, in which FIG. 1 is a plan view of the tool, FIG. 2 is a partially cutaway front view of FIG. 1, and FIG. 4 is a diagram showing the relationship between the voltage of the DC power source and the roughness, and FIG. 5 is a diagram showing the relationship between the abrasive grain size and the roughness. 1...Rotation axis, 2...Center hole, 3...
...Mounting seat, 5...Electrode, 6...
Through hole, 7...buffer material, 8...abrasive material.

Claims (1)

[Claims] 1. An electrode having electrode surfaces and insulating surfaces alternately formed in a radial manner is attached to the mounting seat at the end of the rotating shaft, and the lower surface of the electrode is
A liquid-permeable, insulating cushioning material is attached, and a liquid-permeable, insulating, sheet-like abrasive material to which abrasive grains are fixed is attached to the lower surface of the cushioning material, and the rotating shaft is rotated. The abrasive material is pressed onto the surface to be polished, and an electrolytic solution is supplied between the electrode and the surface to be polished through the central hole of the rotating shaft and the through hole of the electrode, and the electrode is used as a cathode and the object to be polished is A DC power source is applied as an anode, and the gap between the electrode and the surface to be polished is set to 2 to 3 m.
The rotating shaft is rotated at 100 to 200 m/mi while maintaining
A method for mirror finishing by electrolytic composite polishing, characterized in that the polishing rotates at a speed of n, the DC power source is set to 4 to 7 V, and the abrasive grains have an abrasive grain diameter of 6 μm or less.