JPH10296542A - Electroysis composite polishing method for long metallic tube inside face and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent buckling of a spring plate so as to always hold a polishing cloth with constant pressing force by arranging a plurality of fines of insulating type water permeable polishing cloths with different abrasive sizes via pressing spring plates onto the outer circumferential face of a tool electrode installed in the tip part of a rotary shaft. SOLUTION: Polishing cloths 16 are arranged in a plurality of lines of spring plate mounting parts 14a in the order of a rough polishing cloth, a medium polishing cloth, and a finish polishing cloth toward the tip side. In electrolysis composite polishing, the front end part of a long metallic tube is protected and generation of a bell mouth is prevented because a top dummy tube is connected to the front end part, of the long metallic tube. According to retraction of a tool electrode 14, a rough polishing process, a medium polishing process, and a finish polishing process are carried out in this order, so that electrolysis composite polishing can be finished by a single pass from rough polishing to finish polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic composite polishing method for mirror-finishing the inner surface of a long metal tube and an apparatus therefor.

[0002]

2. Description of the Related Art Seamless stainless steel pipes are generally used in pipes for transporting viscous fluid chemicals and semiconductor clean gas used in food processing, pharmaceutical production, slurry heat exchangers, and the like. Since these supply pipes are required to have particularly high smoothness on the inner surface of the tube in contact with liquid or gas, the inner surface of the tube is smooth (R _max 0.5 μm
It is necessary to perform mirror finishing in the following. Conventionally, as the mirror surface processing of the inner surface of the tube, an electrolytic composite polishing method has been adopted, which combines the elution effect of the inner surface of the metal tube by electrolysis and the rubbing effect of abrasive grains, and is used for high precision processing. The goal is to improve efficiency. For the rubbing action in the electrolytic combined polishing method, a grindstone is usually used, and how to bring the grindstone into contact with the inner surface of the metal tube with a uniform pressure is an important problem. In order to solve this problem, a technique is known in which, for example, a grindstone is attached to the tip of a spring plate and pressed against the inner surface of a metal tube (Japanese Utility Model Laid-Open No. 4-13).
0120).

[0003]

However, according to the above-mentioned spring plate, the tool body on which the spring plate is mounted is rotated at a high speed. Not only cannot the pressing force of the grindstone be kept constant due to deformation of the plate or cracking or breakage of the mounting end of the spring plate, but also the grindstone bends and scratches the metal inner surface. Further, it is difficult to adjust the pressing force of the spring plate, and there is a problem in that the pressing force tends to vary among a plurality of spring plates. Further, in order to process the inner surface of the tube with high precision, it is necessary to perform several steps (coarse, medium, finish polishing, etc.), and it is said that the number of steps is increased and workability is poor.

The present invention has been made to solve such a conventional problem, and a load is not applied to the spring plate from a lateral direction during rotation, the spring plate is hardly deformed, and the spring plate is prevented from breaking. The pressing force of the spring plate can be easily adjusted,
Further, it is an object of the present invention to provide a method and an apparatus for electrolytically polishing a long metal tube inner surface, which enable high-precision mirror finishing in one step.

[0005]

As a specific means for achieving the above object, the present invention provides an insulating type water-permeable material having different abrasive grain sizes on an outer peripheral surface of a tool electrode attached to a tip of a rotating shaft. Abrasive cloth is arranged in a plurality of rows via a pressing spring plate, this tool electrode is inserted into a long metal tube which is a workpiece, and an electrolytic solution is injected into the long metal tube from the tube top side, The long metal tube serving as the anode is rotated at a low speed, and the tool electrode serving as the cathode is pulled out and moved toward the bottom of the tube while rotating at a high speed via the rotating shaft, so that the process from rough polishing to finish polishing is performed in one pass. The gist of the present invention is a method for electrolytically polishing a long metal tube inner surface to be subjected to electrolytic composite polishing. In this electrolytic combined polishing method, abrasive cloths having different abrasive sizes are arranged on the tool electrode in the order of coarse, medium, and finish toward the tip side along the axial direction, and coarse, medium, and finish are arranged in the circumferential direction. Are alternately shifted, and the pressing pressure of the polishing pad by the spring plate is different depending on the strength and the abrasive grain size of the polishing pad. Therefore, the pressing pressure is controlled by changing the number of spring plates for each polishing pad. It is characterized by the following. A rotary support device rotatably supporting a long metal tube as a workpiece; a tool electrode attached to a tip of a rotary shaft inserted into the long metal tube; and an outer peripheral surface of the tool electrode. An insulating type water-permeable polishing cloth of different abrasive sizes arranged in a plurality of rows via a spring plate for pressing, an energizing device for energizing the long metal tube to the anode and a tool electrode to the cathode respectively, Electrolytic composite polishing of the inner surface of a long metal tube provided with an electrolytic solution supply device for supplying an electrolytic solution to the top side of the long metal tube, and a rotation moving device for pulling out the bottom side of the long metal tube while rotating the rotating shaft. The device is the gist. Further, in this electrolytic combined polishing apparatus, the spring plate is formed by superimposing a plurality of stainless steel strips, and is fixed in the circumferential direction so that the base end side is fixed to the tool electrode and curved along the inner peripheral surface of the metal tube. A plurality of, the polishing cloth was respectively attached to the curved surface, provided a chamfered portion in the spring plate mounting portion of the tool electrode,
At the time of polishing, the inner surface of the curved base of the spring plate is brought into contact with the chamfered portion to prevent buckling, and at both ends of the long metal tube,
Dummy pipes with the same inner diameter as this long metal pipe were arranged via a mechanical seal, and a guide wrapper pipe was attached to the end of the dummy pipe on the top of the pipe.The rotation axis was around the rotation axis. A non-rotating outer sleeve is provided via a bearing to form a double structure, and a spacer for steadily winding a flexible insulating fiber wire which is easy to pass an electrolyte around the outer sleeve is attached. By contacting the spacer with the inner surface of the long metal tube during polishing, resonance is suppressed and the rotation axis and the tool electrode are held at the center of the metal tube. The upper electrode portion is formed to be openable and closable by pivotally supporting these base portions, and a plurality of polishing cloths having different abrasive sizes are provided between the upper and lower electrode portions via a spring plate. Arranged in columns And, characterized by.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an electrolytic composite polishing apparatus according to the present invention, wherein A is a long metal tube 1 as a workpiece (inner diameter: 15.0 to 150 mm, length: up to 6 m).
Is a rotary support device for rotating and supporting the shaft. The spindle 2 has a spindle 2 at the front end side. The spindle 2 has a grip chuck 3 also serving as an anode current supply. The side is gripped and fixed.

A top mechanical seal portion 4 is mounted in the spindle 2, and a top dummy tube 5 having the same inner diameter as the long metal tube 1 is inserted through the top mechanical seal portion 4.
Is connected to the front end of the long metal tube 1, and a guide wrapper tube 6 is attached to the front end of the top dummy tube 5.

On the other hand, a bearing portion 7 is disposed on the rear end side of the rotation supporting device A, rotatably holds the bottom side of the long metal tube 1, and has a bottom mechanical seal portion provided in the bearing portion 7. A bottom dummy tube 9 having the same inner diameter as the long metal tube 1 is connected to the rear end of the long metal tube 1 via the same 8.

The bottom dummy tube 9 has a rear end opening in an electrolyte solution receiving tank 10. The electrolyte solution supplied from the top side during polishing and used for electrolysis in the long metal tube 1 is used as an electrolyte solution. It can be discharged into the receiving tank 10.

Reference numeral 11 denotes a plurality of tube receiving rollers disposed below the long metal tube 1 for supporting the long metal tube 1 so as not to bend.

Reference numeral 12 denotes an anode energizing device which charges the long metal tube 1 to the anode through the grip chuck 3 mounted on the spindle 2. The bearing part 7
An anode energizing device 13 is also provided on the side.

Reference numeral 14 denotes a tool electrode, which is fixed to the tip of a rotating shaft 15 having a double structure, and is provided with an insulating water-permeable polishing cloth 16 having a different abrasive grain size via a pressing spring plate 17. A plurality of them are attached in the circumferential direction and are arranged in a plurality of rows along the axial direction of the tool electrode 14.

As shown in FIG. 3, a plurality of rows (six rows in FIG. 3) of the tool electrodes 14 are provided at fixed intervals of the spring plate mounting portions 14a.
Each spring plate mounting portion 14a is provided with two spring plates 17
Are mounted in opposite directions, and the spring plate mounting portion 14 is
The polishing pad 16 inserted into the through hole of
It is adhered to the surface side of. Therefore, in the long metal tube 1, the polishing pad 16 is curved in an S shape by the spring plate 17 and pressed against the inner surface of the long metal tube 1.

The polishing cloth 16 is attached to a plurality of rows (six rows) of spring plate mounting portions 14a having different abrasive sizes, that is, toward the tip side along the tool electrode 14 as shown in FIG. They are arranged in order of coarse, medium, and finish. In this case, the third row counted from the last row is a polishing cloth for rough polishing (not shown), the fourth and fifth rows are polishing cloths for an intermediate polishing step (not shown), and the sixth row (most A polishing cloth (not shown) for the final polishing step is attached to the front row). The abrasive cloth used is different in abrasive grain number for coarse, medium and finish.

The mounting directions of the spring plates 17 are alternately shifted by 90 ° in the circumferential direction between the rows, that is, the odd rows are arranged substantially vertically, and the even rows are arranged substantially horizontal. is there. This is because the polishing cloths 16 are alternately positioned to prevent uneven polishing.

As shown in FIG. 5, the spring plate 17 is formed by superposing a plurality of stainless steel strips, and in this case, the innermost portion is a 0.05 mm-thick buckling prevention strip 17a, which remains. Each of the three strips is a pressing strip 17b having a thickness of 0.1 mm, and is formed to have a longer length as it goes outward. A protective plate piece 17c made of soft stainless steel having a thickness of 0.1 to 0.2 mm is attached to the outermost side.

The spring force of the spring plate 17 can be easily adjusted by changing the combination of the strips or changing the number of strips. Further, the pressing force of the spring cloth 17 on the polishing cloth 16 varies depending on the strength of the polishing cloth 16 and the size of the abrasive grains. Therefore, the pressing force can be controlled by adjusting the spring force for each polishing cloth 16.

The spring plate mounting portion 14a is configured such that the base end of the spring plate 17 is fixed with a screw or the like, and a flat chamfered portion 14b inclined inward is formed at the outer end. By receiving the spring plate 17 which is curved at the time of polishing by the portion 14b, the base end of the spring plate is protected and the hip break can be prevented beforehand.

Further, as shown in FIG. 6 (b), the front end of the spring plate 17 including the protection plate piece 17c is formed by cutting the rear corner into one corner.
When the tool electrode 14 is inserted into the long metal tube 1 from the guide wrapper tube 6 together with the rotating shaft 15 as described later, the polishing cloth 16 is pulled as shown in FIG. This is to prevent the corners of the spring plate 17 from being exposed even if it is tilted forward.

As shown in FIG. 7, the rotating shaft 15 has a double structure by providing a non-rotating outer sleeve 15b around a rotating shaft core 15a via a bearing 18 and a bearing stopper 19 as shown in FIG. The shaft core 15a has a double tube structure of stainless steel and copper for the purpose of increasing the electric conductivity and the twisting strength.

Around the outer sleeve 15b, there is attached a spacer 21 for helically winding a flexible insulating fiber wire 20 which is easy to pass an electrolytic solution. By contacting the inner surface of the tube 1, resonance is suppressed, and the rotating shaft 15 (specifically, the rotating shaft core 15 a) and the tool electrode 14 are held at the center of the long metal tube 1. In FIG. 7, 2
2 is a mechanical seal member for sealing between the rotating shaft core 15a and the outer sleeve 15b, and 15c is an outer sleeve 15
The elastic type shrink tube 15d interposed between the bearing b and the bearing 18 is an insulating coating applied to the outer surface of the outer sleeve 15b.

Returning to FIG. 1, B is a rotary moving device installed behind the rotary support device A. A guide rail 24 is provided on a base 23 in the front-rear direction. The moving table 26 moves back and forth along the guide rail 24.

On the moving table 26, a support 27 is provided.
Is fixed, and a chuck 28 a is
The rotating shaft 28 is supported by a shaft. The rotating shaft 28 is connected to a rotating motor 30 via a coupling 29 which also serves as an insulating member. Are arranged. Reference numeral 32 denotes a tube support member attached to the front end side of the moving table 26.

The rotating shaft 15 is inserted into the long metal tube 1 from the guide wrapper tube 6 side, and the rear end of the rotating shaft core 15a is attached to the chuck 28a of the rotating shaft 28. At this time, the tube support member 32 supports the rear end of the outer sleeve 15b of the rotating shaft 15.

When the moving table 26 is retracted from this state, the rotating shaft 15 is retracted, and the tool electrode 14 is drawn into the top dummy tube 5. At this time, the spring plate 17 is gradually curved by the tapered surface of the guide wrapper tube 6, and the polishing pad 16 is deformed into an S shape to obtain a required state. When all the polishing cloths 16 are drawn into the top dummy tube 5 together with the spring plate 17, the moving table 26 is stopped once.

Reference numeral C denotes an electrolytic solution supply device installed in front of the rotation supporting device A, which has a spindle 33 that rotates synchronously with the spindle 2, and a cylinder 34 is attached to the spindle 33. A liquid supply nozzle 35 is provided at the tip of the hollow rod 34a which is advanced and retracted.
Is attached.

The liquid supply nozzle 35 is adapted to be fitted to the guide wrapper tube 6 as shown in FIG. 2, and discharges the electrolyte flowing into the hollow rod 34a. The discharged electrolyte solution is supplied into the long metal tube 1 through the guide wrapper tube 6 and the top dummy tube 5.

The long metal tube 1 is rotated by the spindle 2 at a low speed (about 60 rpm).
13, the anode is charged by the rotating motor 30 and the rotating shaft core 15a is rotated at a high speed (peripheral speed: 2 to 5 m /
sec) The cathode is rotated, and the cathode is charged by the cathode conducting device 31. At this time, the tool electrode 14 rotates together with the rotating shaft core 15a, and the rotating direction is opposite to that of the long metal tube 1 as shown in FIG.

Then, the electrolytic solution is supplied from the top side of the long metal tube 1 by the liquid supply nozzle 35, and the tool electrode 14 is retracted by the moving table 26 via the rotary shaft 15a. Done.

In this electrolytic combined polishing operation, since the top dummy tube 5 is connected to the front end of the long metal tube 1, the front end of the long metal tube 1 is protected and no bell mouth is generated. Since the rough polishing process, the intermediate polishing process, and the finish polishing process are performed in this order as the tool electrode 14 is retracted, the electrolytic combined polishing is completed in one pass from the rough polishing to the finish polishing.

In each polishing step, each polishing cloth 16 is constantly pressed against the inner surface of the long metal tube 1 by the spring plate 17 at a constant pressure, so that high-precision polishing can be obtained. Since each spring plate 17 is curved in the rotation direction of the tool electrode 14, a strong load is not applied from the lateral direction unlike the conventional spring plate, and the base end of the spring plate 17 is
a is received by the chamfered portion 14b of FIG.
Does not deform or break, and stable polishing can be obtained.

Further, since the spacer 21 is always in contact with the inner surface of the long metal tube 1, the tool electrode 14 is always held at the center axis position of the long metal tube 1 to prevent uneven polishing. Helical fiber wire 20 of spacer 21
Is made of a flexible material that easily passes through the electrolyte,
It does not prevent the flow of the electrolyte and does not damage the inner surface of the long metal tube 1. Furthermore, since the bottom dummy tube 9 is also connected to the rear end of the long metal tube 1, the rear end of the long metal tube 1 is protected at the final stage of polishing, and no bell mouth is generated.

Since the electrolytic solution is supplied from the top side, that is, the front end side of the long metal tube 1 as described above, a clean electrolytic solution is always supplied to the electrolytic portion, and an efficient electrolytic action can be obtained. Can be From these facts, the inner surface of the long metal tube can be mirror-finished with high precision in one step.

FIGS. 8 to 11 show a small-diameter long metal tube (inner diameter:
This shows an embodiment suitable for (φ15 to 20 mm), and uses a crocodile-type tool electrode. That is, as shown in FIG. 8, the crocodile-type tool electrode 36 includes a lower electrode portion 36a and an upper electrode portion 3.
6b, and their base ends are pins 36f.
The upper electrode portion 36b is formed so as to be openable and closable by being pivotally supported by each other, and each of the coarse, intermediate, and finishing polishing cloths 38 having different abrasive sizes is provided between the upper and lower electrode portions via a spring plate 37.
Are arranged in multiple columns.

The polishing cloth 38 is usually about 5 mm in thickness, and the interval at which the polishing cloth is set is as small as 2 to 3 mm. Although the abrasive grains are clogged as they are crushed, there is a concern that the rubbing force may be reduced.

As shown in FIG. 9, the tool electrode 36 is provided with a spring plate mounting portion 36c corresponding to the upper and lower electrode portions, and a curved spring plate is received on a side surface of the spring plate mounting portion 36c. A chamfered portion 36d is formed, and a fastening portion 36e is provided at the boundary between the distal end portion and the spring plate mounting portion 36c.

The spring plate 37 has a different spring force from that of the spring plate 17, but has the same basic structure. The base end of the spring plate 37 is screwed to the spring plate mounting portion 36c as shown in FIG. And attach it. When the upper electrode portion 36b is closed and overlapped with the lower electrode portion 36a, the thinned polishing pad 38 is sandwiched between the upper and lower spring plates 37, and the fastening portions 36e are fixed to each other by set bolts 39. To be integrated.

The tool electrode 36 thus formed
Before use, the spring plate 37 is in an extended state as shown in FIG. 11A, but when stored in the small-diameter long metal tube 40, the spring plate 37 is curved as shown in FIG. Polished cloth 3
8 is pressed against the inner surface of the tube. The electrolytic composite polishing operation is performed in the same manner as described above, and the inner surface of the small-diameter long metal tube 40 can be mirror-finished in one step with high accuracy.

[0039]

As described above, according to the present invention,
A polishing cloth was arranged on the same circumference of the tool electrode via a plurality of curved spring plates, and polishing cloths having different abrasive grain sizes for coarse, medium and finish polishing were arranged along the axial direction of the tool electrode. Therefore, when the tool electrode is rotated, no load is applied to the spring plate from the lateral direction, the spring plate is hardly deformed, and the spring plate is prevented from breaking, whereby the polishing cloth always maintains a constant pressing force, and Excellent effects such as high-precision mirror finishing can be performed in one process. Further, since the pressing pressure of the polishing pad varies depending on the pressure of the spring plate, the strength of the polishing pad, and the size of the abrasive grains, it can be easily adjusted by changing the number of spring plates for each polishing pad. Furthermore, since the rotating shaft has a double structure, a spacer is attached to the outer peripheral surface of the rotating shaft to make contact with the inner surface of the tube, so that resonance is prevented and stable polishing is obtained by always holding the tool electrode on the center axis of the tube. And the like.

[Brief description of the drawings]

FIG. 1 is a schematic overall view of an electrolytic combined polishing apparatus according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state during electrolytic combined polishing.

FIG. 3 is an explanatory view of a tool electrode portion.

FIG. 4 is a cross-sectional view showing a state of a spring plate and a polishing cloth during polishing.

FIG. 5 is a cross-sectional view showing an attached state of a spring plate.

FIGS. 6A and 6B are explanatory views showing the state of a spring plate and a polishing cloth.

FIG. 7 is a cross-sectional view illustrating a configuration of a rotation shaft.

FIG. 8 is an explanatory view showing a tool electrode for a small-diameter long metal tube.

FIG. 9 is a schematic perspective view showing a main part of a tool electrode.

FIG. 10 is a schematic cross-sectional view showing a state in which a polishing pad is attached to a tool electrode via a spring plate.

11A is a cross-sectional view showing the state of the spring plate and the polishing cloth before storage, and FIG. 11B is a cross-sectional view showing the state during the polishing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Long metal tube 2 ... Spindle 3 ... Grip chuck 4 ... Top mechanical seal part 5 ... Top dummy tube 6 ... Guiding wrapper tube 7 ... Bearing part 8 ... Bottom mechanical seal part 9 ... Bottom dummy tube 10 ... Electrolyte receiver Tank 11 ... Tube receiving rollers 12, 13 ... Anode energizing device 14 ... Tool electrode 15 ... Rotating shaft 16 ... Polishing cloth 17 ... Spring plate 18 ... Bearing 19 ... Bearing stopper 20 ... Insulating fiber wire 21 ... Spacer 22 ... Mechanical seal material Reference Signs List 23 Base 24 Guide rail 25 Driving chain 26 Moving table 27 Support part 28 Rotating shaft 29 Coupling 30 Rotary motor 31 Cathode conducting device 32 Tube support member 33 Spindle 34 Cylinder 35 ... liquid supply nozzle 36 ... tool electrode 37 ... spring plate 38 ... polishing cloth 39 ... set Tobolt 40 ... Small diameter long metal tube

Continuation of front page (72) Inventor Kazuo Akagi 14-1, Nagafuminatocho, Shimonoseki-shi, Yamaguchi Prefecture Nissin Transportation Industry Co., Ltd.

Claims (10)

[Claims] 1. An insulating water-permeable polishing cloth having a different abrasive grain size is provided on an outer peripheral surface of a tool electrode attached to a tip portion of a rotating shaft.
The tool electrodes are arranged in a plurality of rows via a pressing spring plate, and the tool electrodes are inserted into a long metal tube as a workpiece, and an electrolytic solution is injected into the long metal tube from the tube top side to form the anode as an anode. The composite metal polishing from rough polishing to finish polishing is performed in one pass by rotating the shank metal tube at low speed and pulling and moving the tool electrode, which has been the cathode, to the tube bottom side while rotating at high speed through the rotating shaft. An electrolytic combined polishing method for the inner surface of a long metal tube, characterized by the following. 2. A polishing pad having a different abrasive grain size is arranged on the tool electrode in the order of coarse, medium, and finish in the axial direction toward the tip end, and the arrangement of the coarse, medium, and finish circumferential directions is alternated. 2. The electrolytic composite polishing method for an inner surface of a long metal pipe according to claim 1, wherein a plurality of the metal pipes are arranged at different positions. 3. The pressing pressure of the spring cloth by the spring plate varies according to the strength of the polishing cloth and the size of the abrasive grains, and the pressing pressure is controlled by changing the number of spring plates for each polishing cloth. Electrolytic composite polishing method for the inner surface of a long metal tube. 4. A rotary support device for rotatably supporting a long metal tube as a workpiece, a tool electrode attached to a tip of a rotating shaft inserted into the long metal tube, and the tool electrode. An insulating type water-permeable polishing cloth having a different abrasive grain size arranged in a plurality of rows via a spring plate for pressing against the outer peripheral surface of the polishing pad, An electrolytic solution supply device that supplies an electrolytic solution to the top side of the long metal tube, and a rotation moving device that pulls out the bottom side of the long metal tube while rotating the rotating shaft. Electrolytic composite polishing equipment. 5. A spring plate is formed by superposing a plurality of stainless steel strips, and a plurality of spring plates are fixed in a circumferential direction so as to be fixed to a tool electrode at a base end side and curved along an inner peripheral surface of a metal tube. 5. The apparatus according to claim 4, wherein a polishing cloth is attached to each of the curved surfaces. 6. The long metal according to claim 4, wherein a chamfered portion is provided at a spring plate mounting portion of the tool electrode, and an inner surface of a curved base portion of the spring plate is brought into contact with the chamfered portion during polishing to prevent buckling. Electrolytic composite polishing equipment for pipe inner surface. 7. A dummy pipe having the same inner diameter as the long metal pipe is disposed at both ends of the long metal pipe via a mechanical seal, and a guide wrapper pipe is provided at an end of the dummy pipe on the top of the pipe. The electrolytic composite polishing apparatus for an inner surface of a long metal tube according to claim 4 attached. 8. The rotating shaft is provided with a non-rotating outer sleeve around a center of the rotating shaft via a bearing to form a double structure, and has a flexible insulating property through which an electrolytic solution easily passes around the outer sleeve. Attach a spacer for steadily winding a fiber wire in a spiral shape, and contact this spacer with the inner surface of a long metal tube at the time of polishing to suppress resonance, and at the center of the metal tube, a rotating shaft core and a tool electrode 5. The apparatus according to claim 4, wherein the polishing is performed. 9. The apparatus according to claim 8, wherein the rotating shaft has a double tube structure of stainless steel and copper. 10. A tool electrode is divided into a lower electrode portion and an upper electrode portion, and the base electrode portion is pivotally supported to form an upper electrode portion so as to be openable and closable. 5. The electrolytic composite polishing apparatus according to claim 4, wherein polishing cloths having different abrasive sizes are arranged in a plurality of rows via a spring plate.