JPS6030760B2 - Electrolytic composite mirror finishing method for cylindrical workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic composite mirror finishing method for a cylindrical workpiece, which significantly increases processing speed and improves finished roundness and finished surface roughness.

In the conventional electrolytic composite mirror finishing method for a cylindrical workpiece, as shown in FIG.
At the same time, a supply port 4 that closes on the concave surface 3 is formed.

Then, the concave surface 3 of the tool electrode m is placed on the outer surface of the workpiece 2, with an abrasive material 5 interposed between the concave surface 3 of the tool electrode m, and the abrasive material 5 interposed between the concave surface 3 and the gap where a predetermined abrasive pressing pressure is achieved.
is supplied, the workpiece 2 is rotated in the direction of the arrow A, the tool electrode 1 is used as a cathode, the workpiece 2 is used as an anode, and several V~
By applying the following electrolytic action of 1 vessel at 1 cough V and applying one pass or several passes of feed Vf, the electrolytic action and the abrasive action by the abrasive material 5 are combined, and the outer surface of the workpiece 2 becomes zero. .1~0. It will be finished to the mirror surface of Autumn mRz. However, in the conventional method, only one tool electrode 1 is provided, and superfinishing cannot be performed effectively at high speed. This invention has been made with the above points in mind, and will now be described in detail with reference to FIGS. 2 and 3 showing one embodiment thereof.

Three cathodic tool electrodes: a rough finishing tool electrode 11, a finishing tool electrode 12, and a super finishing tool electrode 13
Similarly to the above, concave surfaces 31, 32, 33 having a radius slightly larger than the radius of the anodic cylindrical workpiece 2 are respectively formed, and supply ports 41, 42, 43 are closed to each concave surface 31, 32, 33. The concave surfaces 31, 32, 33 of the tool electrodes 11, 12, 13 are coated with a rough finishing abrasive 51 and a finishing abrasive 52, respectively, on the outer surface of the cylindrical workpiece 2.
, superfinishing abrasive material 53 is interposed between them, and the abrasive grains are placed opposite each other with a gap that provides a predetermined abrasive pressing pressure, and from each supply port 41, 42, 43, two
The electrolyte 6 of 0% sodium nitrate aqueous solution is supplied, the workpiece 2 is rotated in the direction of arrow A, and each tool electrode 11, 12, 1
3 is used as a cathode, workpiece 2 is used as an anode, and several V~
It gives an electrolytic action of 10A/or less at 1 cough V and applies a feed Vf of 1 pass, and is 0.02 to 0.04 French m.
A super-mirror finish of Rz can be achieved, and the roundness can be improved.

The rough finishing abrasive material 51 is made of a water permeable hard material, and the finishing abrasive material 52 and super finishing abrasive material 53 are made of water permeable soft non-woven fabric with abrasive particles attached. I am using it.

Further, the conditions for elution and removal from the workpiece 2 are set as shown in Table 1 under each of the tool electrodes 11, 12, and 13. *Table 1 Next, the results of implementing this invention will be explained with reference to FIG. 3, using a cylindrical workpiece that has been turned to a diameter of 30 to 4 mRz.

In the figure, the horizontal axis shows the feed rate Vf of the tool electrode, and the vertical axis shows the finished surface roughness Rz of the workpiece and the roundness 6 of the workpiece. The broken line in the same figure indicates that, as in the past, one tool electrode is used, bottom grains of #240 to #32 are used as the finishing abrasive, and one pass is used. The cylindrical workpiece of the 3rd enemy was finished with an electrolytic composite mirror finish, and the base surface of 30-4 Misaki mRz is
The feed speed Vf of the tool electrode is 4 legs/willow or less, 0.1 to 0
．． It is finished to a mirror-like surface with a roundness of 6, which is only around 2 m for a base of 8 to 1 m.

On the other hand, the solid line in the same figure is based on the method of the present invention, the large line is for the case where there are three tool electrodes as shown in Fig. 2, and the thin line is for the case where there are two tool electrodes, one for rough finishing and one for finishing. This is the case when a tool electrode is used.

The finishing conditions for each are shown in Table 2. Table 2 Therefore, as is clear from the solid line in Fig. 3, according to the three tool electrodes of the present invention, the
The feed rate Vf of the tool electrode that obtains a mirror surface of 0.1 french mRz from the base surface of z is 2 x cape/skin compared to the feed rate of 4 sides/rib with one tool electrode, and can be increased in speed.

In addition, in the case of this invention, if the feed rate is set to 4 sides/ribs,
A mirror surface of 0.02 to 0.0 mRz is obtained. In addition, the roundness 6 of the workpiece is 0.6 to 0 at the 0.1 french mRz level.
．． 7 French m, 0.02-0.04〆mRmax x level 0
．． It can be improved to around 1000 m. Further, as is clear from the pongee line in FIG. 3, the two-tool electrode of the present invention improves finishing speed and roundness.

and 0.1 to 0. The feed rate in mRz has been improved from 4 willow/fence of 1 tool electrode to 12 sides/willow, and the roundness is 6.
Also, for 2&m of one tool electrode, 0.3 to 0. headed for punishment. As described above, according to the electrolytic composite mirror finishing method for a cylindrical workpiece of the present invention, by using two or more tool electrodes and using two or more types of abrasives with different abrasive grain sizes,
Machining speed can be significantly improved, and finished roundness and finished surface roughness can be improved.

Brief Description of the Drawings Figures 1a and b are front and side views of a conventional finishing method, Figure 2 is a front view of an embodiment of the finishing method of the present invention, and Figure 3 is a feed rate and finished surface roughness. , is an implementation result diagram of the roundness of the workpiece.

11, 12, 13...Tool electrode, 2...Cylindrical workpiece, 3
1, 32, 33... concave surface, 51, 52, 53 - abrasive material.

Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 The electrode surface of the cathode tool electrode is a concave surface with a radius of the cylindrical workpiece or a slightly larger radius, the cylindrical workpiece is anode, and an abrasive and an electrolyte are interposed between the tool electrode and the cylindrical workpiece. , a method of mirror-finishing the outer surface of a cylindrical workpiece by a combination of an electrolytic action of 10 A/cm^2 or less at a voltage of a few V to a few tens of V and an excessive grinding action, in which two or more of the tool electrodes are used, and the grinding wheel grain size is Two or more different types of abrasives are interposed between the electrode surfaces of the two or more tool electrodes and the cylindrical workpiece, and the two or more tool electrodes are fed in conjunction with each other to make the outer surface of the cylindrical workpiece mirror-like. An electrolytic composite mirror finishing method for cylindrical workpieces characterized by finishing.