JPS5819500A - Electrolytic composite specular finishing method for cylindrical work - Google Patents

Abstract

PURPOSE:To improve the speed of working and to improve finish roundness and finish surface roughness in electrolytic composite specular finishing of the cylindrical work by using >=2 pieces of tool electrodes and using >=2 kinds of abresive materials of different abrasive grain sizes. CONSTITUTION:A tool electrode 11 for rough finishing, a tool electrode 12 for finishing and a tool electrode 13 for super finishing are provided as cathodic tool electrodes. Recessed surfaces 31, 32, 33 of a radius equal to the radius of the anodic cylindrical work 2 or slightly larger than said radius are formed to said electrodes respectively. An adrasive material 51 for rough finishing, an abrasive material 52 for finishing and an abrasive material 53 for super finishing are interposed respectively between the surfaces 31, 32, 33 and the work 2. An electrolyte 6 which is an about 20% aq. NaNO3 soln. is supplied through supply ports 41, 42, 43. The work 2 as the anode is rotated in an arrow A direction, and an electrolyzing effect of about several V - some 10V, <=10A/cm<2> is applied to the electrodes 11, 12, 13 as the cathode; at the same time, the work is fed at Vf in one pass, whereby it is polished and rubbed.

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.

What is the conventional electrolytic composite mirror finishing method for cylindrical workpieces?

As shown in Figure 1, a concave surface (3) with a radius slightly larger than the radius of the R-polarity cylindrical workpiece (2) is formed on the cathode tool electrode (υ), and an opening is formed in the concave surface (3). A supply port (4) is formed to feed the workpiece (2).
The concave surface (3) of the tool electrode (1) is placed on the outer surface of the abrasive material (5).
A 20% sodium nitrate aqueous electrolyte (
6), and rotate the workpiece (2) in the direction of arrow A.
By using the tool electrode (1) as a cathode and the workpiece (2) as an anode, applying an electrolytic action of less than IOA/cd at several V-10 several ■, and applying 1 bus or several passes of feed VF, The electrolytic action and the abrasive action by the abrasive (5) are combined, and the outer surface of the workpiece (2) is αl ~ 0.2 μmRz
Finished with a mirror finish.

However, in the conventional method, only one tool electrode (1) is provided, and superfinishing cannot be performed effectively at high speed.

This invention was made with the above points in mind,
Next, this invention will be explained in detail with reference to FIG. ff12 and FIG. 3 showing an embodiment thereof.

The three gruesome tool electrodes, namely the rough finishing tool electrode uli, the finishing tool electrode +12i, and the super finishing tool electrode u31K, each have a radius or radius of the anodic cylindrical workpiece (2) as described above. While forming a concave surface 131), country, (33) with a slightly larger radius,
Supply ports +41) and f4L (43+) opened to each concave surface 1311, 132, +331 are formed.

Each tool electrode α1), αz,
Each concave surface of u31 (31+, 02, (331,
Abrasive material for rough finishing (51) and abrasive material for finishing (
52), super-finishing abrasive material (53) is interposed between them, and each supply port t411 is provided oppositely with a gap that provides a predetermined abrasive grain pressing pressure.
(4'a, t43 supplies electrolyte (6) of 20% sodium nitrate aqueous solution, rotates the workpiece (2) in the direction of arrow A, and connects each tool electrode (Ill, (121, +1
31 as a cathode, and the workpiece (2) as an anode,
Give an electrolytic action of less than IOA/d with several V-10 ■,
It multiplies the pass feed Vf, which is 0.02 to 0.0
It can be finished to a super mirror surface of 4 μmR2, and the roundness can be improved.

The rough finishing abrasive material (51) is made of 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. Abrasive grains are used.

- Also, the elution and removal action from the workpiece (2) is performed by each tool electrode ti11. (Under 121, [31, conditions are set as shown in Table 1.

Table 1 Next, the results of implementing this invention are shown as 30 mm as a cylindrical workpiece.
The case of using one turned to ~40 μm RZ will be explained together with the third problem. In the figure, the horizontal axis shows the feed rate vf of the tool electrode, and the vertical axis shows the finished surface roughness R2 of the workpiece and the circularity δ of the workpiece.

The broken line in the same figure shows that, as in the past, one tool electrode is used, #240 to #320 abrasive grains are used as the finishing abrasive, and a cylindrical workpiece with a diameter of 30 mm is electrolytically finished to a mirror finish using the ■ pass. The underlying surface of 30 to 40 μm R2 is 0.1 to
It is finished to a mirror surface of 0.2 μm Rz, and the roundness δ is only around 2 μm compared to the 8 to 12 μm roundness of the base.

The solid line in the same figure shows the method of the present invention, the thick line shows the case where there are three tool electrodes as shown in Fig. 2, and the thin line shows the case where there are two tool electrodes, one for rough finishing and one for finishing. This is the case using the tool electrode. and.

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 feed rate v of the tool electrode to obtain a mirror surface of O1 μmRz from the base surface of 30 to 40 μmRz
f is the feed rate of 41 IM/A by l tool electrode,
20 m+/@is 'C available, allowing for faster speeds.

Further, in the case of the present invention, when the feed rate is set to 4IIH/miR, a mirror surface of 0.02 to 0.04 μmR2 can be obtained. Also.

The roundness δ of the workpiece is also 0.6 to 0 at the O1μmRz level.
．． 7pm, 0.02 0.04/1mRmax
It can be improved to around 0.3 μm with v bell.

Moreover, as is clear from the thin line in FIG.
According to the tool electric cage, finishing speed and roundness force; improved. And the feed rate at 0.1~0.2μrnRz is 121EI compared to 4$01/IIB for l tool electrode.
The roundness δ also improves by 0.B to 0.4 μm, compared to 2 μm for the l-tool electrode.

As described above, according to the electrolytic composite mirror finishing method for cylindrical workpieces of the present invention, the machining speed is significantly improved by using two or more tool electrodes and using two or more types of abrasives with different abrasive grain sizes. let At the same time, the roundness and roughness of the finished product can be improved.

[Brief explanation of the drawing]

Figure 1 (a), (1)) is a front view of the conventional finishing force method;
The second figure is a front view of one embodiment of the finishing force method of this invention, and the third figure is the feed rate and finished surface roughness. FIG. 3 is a diagram showing the results of measuring the roundness of a workpiece. (Ill, 't121, (131...tool electrode, (2)...cylindrical workpiece, 1311°132)
, 1331... Concave surface, (51), (52), (53
)...Abrasive material. Agent: Patent Attorney Ryuta Fujita Figure 1 Figure 2

Claims (1)

[Claims] ■ The electrode surface of the cathode tool electrode is a concave surface with the radius of one 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 electrolytic action and polishing action of 10 A/- or less at several volts to several lO, using two or more of the tool electrodes and using two types of abrasive grains with different grain sizes. The above abrasive material is 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 mirror-finish the outer surface of the cylindrical workpiece. An electrolytic composite mirror finishing method for cylindrical workpieces, which is characterized by: