JPH07112326A - Compound polishing device for cylindrical workpiece internal surface - Google Patents

Abstract

PURPOSE:To enable a compound polishing device to apply a constant pressing force constantly to a polishing material even if any wear takes place thereto, to provide stabilized pressing force in the longitudinal direction of the polishing material, to improve polishing efficiency and to insert a polishing tool simply into the compound polishing device without any exclusive guide. CONSTITUTION:A compound polishing device is equipped with an electrically conductive rotary shaft 2 having a fluid pressure supply hole 3 formed therein, a cylindrical electrode 4 set on the end of the rotary shaft 2, a plurality of fitting holes 5 formed on the circumferential surface of the electrode 4 at equal intervals and longitudinally, communicating hole 6 communicating with the fluid pressure supply hole 3 formed in the electrode 4 and with each fitting hole 5, a diaphragm 7 fitted to each fitting hole 5 and a polishing material 12 set on the top surface of the longitudinal diaphragm 7 and provided on the internal surface of a cylindrical workpiece 1 pressed against its internal surface and freely detachable thereform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical workpiece inner surface composite polishing apparatus for polishing the inner surface of a cylindrical workpiece by a combination of a rubbing action by an abrasive and an electrolytic action.

[0002]

2. Description of the Related Art Electrolytic composite polishing is a technique for polishing a metal surface with high precision by combining electrolytic action and abrasion action by an abrasive. This electrolytic composite polishing technique is applied to internal surface polishing of a cylindrical workpiece. In this case, it is necessary to apply a pressing force for pressing the abrasive to the surface to be polished, that is, the inner surface of the cylindrical work piece, for the rubbing action by the abrasive, and a spring is used as the method.

However, when a spring is used, in a limited place such as the inner surface of a cylindrical workpiece, the pressing force of the spring decreases as the abrasive wears, and the desired polishing performance cannot be obtained. Further, the spring generates a force by giving a predetermined deflection, which causes a problem that a dedicated insertion guide is required when the polishing tool is inserted into the inner surface of the cylindrical workpiece. A diaphragm is used as a method of solving such a problem.

[0004]

When the conventional diaphragm is used, when the diameter of the cylindrical workpiece is small, the diameter of the diaphragm is limited, so that the pressing force of one diaphragm is insufficient and the abrasive The stability of the pressing force in the length direction deteriorates. Therefore, the length of the abrasive material attached to one diaphragm is also limited,
There is a problem that the polishing efficiency is low.

In the present invention, in consideration of the above points, a constant pressing force is always applied, the pressing force is stable in the length direction of the abrasive, the polishing efficiency can be improved, and the polishing tool is exclusively inserted. An object of the present invention is to provide a cylindrical workpiece inner surface composite polishing device that can be easily inserted without a guide.

[0006]

In order to solve the above problems, a cylindrical workpiece inner surface composite polishing apparatus of the present invention is mounted on a conductive rotary shaft having a fluid pressure supply hole and an end of the rotary shaft. Columnar electrode, a plurality of fitting holes formed on the circumferential surface of the electrode at equal intervals and before and after, a fluid pressure supply hole formed in the electrode and a communication communicating with each fitting hole. A hole, a diaphragm attached to each fitting hole, and an abrasive material attached to the upper surfaces of the front and rear diaphragms and attached to the inner surface of the cylindrical work piece so as to be freely pressed and detached.

[0007]

In the cylindrical workpiece inner surface composite polishing apparatus of the present invention constructed as described above, a plurality of abrasives disposed on the circumferential surface of the cylindrical electrode are attached to the front and rear diaphragms, respectively. Fluid pressure is supplied to the front and rear diaphragms through the fluid pressure supply hole of the rotary shaft and the communication hole of the electrode, and each polishing material is pressed against the inner surface of the cylindrical workpiece by the front and rear diaphragms. The stability of the pressing force with respect to the length direction is improved, the length of the abrasive is not limited, and the polishing efficiency is improved.

Further, the pressing force of the abrasive can be arbitrarily adjusted by adjusting the fluid pressure, and a constant pressing force can be always applied by increasing the fluid pressure according to the abrasion of the abrasive. It is possible to achieve various polishing finishes. Further, by reducing the fluid pressure, the polishing material is buried in the fitting hole of the electrode, and the polishing tool can be easily inserted into the cylindrical workpiece without using a dedicated insertion guide.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In these drawings, 1 is a cylindrical workpiece, 2 is a conductive rotary shaft in which a fluid pressure supply hole 3 is formed, 4 is a cylindrical electrode mounted by screwing onto the tip of the rotary shaft 2, and 5 is an electrode. A plurality of fitting holes 6 formed in the electrode 4 at equal intervals on the circumferential surface of 4 are formed in the front and rear, and fluid pressure supply holes 3 are formed in the electrode 4.
A communication hole communicating with the fitting hole 5 and a diaphragm 7 are attached to a mounting seat 8 on the peripheral surface of the fitting hole 5 and are made of a flexible material such as rubber. Reference numeral 9 denotes an annular fixing plate attached to the peripheral edge of the diaphragm 7, and the peripheral edge of the diaphragm 7 is screwed to prevent the working fluid such as air from leaking between the diaphragm 7 and the attachment seat 8. Is in close contact with.

Reference numeral 10 denotes a base plate mounted on the upper surface of the diaphragm 7, 11 is a mounting plate mounted on the upper surfaces of the front and rear base plates 10, and 12 is a prismatic grindstone mounted on the mounting plate 11. Abrasive material, 13 is formed on both sides of the mounting plate 11, and the abrasive material 12
The holding claws 14 and 15 are abrasive material guide discs disposed on both surfaces of the electrode 4, and are made of an insulating material such as plastic. The disc 14 on the base side is the disc of the rotating shaft 2. The disc 15 on the tip side is sandwiched between the step portion 16 and the electrode 4, and is attached to the electrode 4 by a screw 17 to guide the movement of the abrasive 12. Reference numeral 18 is a DC power source for applying a voltage with the rotating shaft 2 on the cathode side and the cylindrical work piece 1 on the anode side, and 19 is an electrolytic solution supplied to the inner surface 1 of the cylindrical work piece.

Next, the operation will be described. First, with the abrasive 12 buried in the fitting hole 5, the tool is set to the cylindrical workpiece 1.
1, and then air is supplied to the fluid pressure supply hole 3 of the rotary shaft 2 from a separately provided fluid pressure supply source (not shown), for example, in the direction of the thick arrow in FIG. The diaphragm 7 is pushed up in the direction of the solid arrow in FIG. 2 by the fluid pressure through 5. At this time, one abrasive 12 is pushed up in parallel by the front and rear diaphragms 7, guided by the abrasive guide discs 14 and 15 and pressed against the inner surface of the cylindrical workpiece 1 as shown in FIG. It Rotation shaft 2 in this state
Is rotated, the cathode side of the DC power supply 18 is connected to the rotating shaft 2 and the anode side is connected to the cylindrical work piece 1 to apply a voltage, and electrolysis is performed on the inner surface of the cylindrical work piece 1 as indicated by the chain line arrow in FIG. When the liquid 19 is supplied, an electrolytic action occurs in the gap G between the electrode 4 and the inner surface of the cylindrical workpiece 1, and metal elution due to this electrolytic action and removal by abrasion of the abrasive 12 alternate with the inner surface of the cylindrical workpiece 1. The inner surface of the cylindrical workpiece 1 is highly accurately polished and finished.

In this way, the plurality of abrasives 12 arranged on the peripheral surface of the cylindrical electrode 4 are provided with the front and rear diaphragms 7.
Fluid pressure is supplied to the front and rear diaphragms 7 through the fluid pressure supply hole 3 of the rotary shaft 2 and the communication hole 6 of the electrode 4, respectively, and each polishing material 12 is attached to the front and rear diaphragms 7.
Since it is pressed against the inner surface of the cylindrical workpiece 1 by the
The stability of the pressing force in the length direction of 2 is improved, the length of the abrasive 12 is not limited, and the polishing efficiency is improved.

Furthermore, the pressing force of the abrasive 12 can be adjusted arbitrarily by adjusting the fluid pressure, and a constant pressing force can always be applied by increasing the fluid pressure as the abrasive 12 wears.
Highly accurate polishing finish of the inner surface of the cylindrical workpiece 1 becomes possible. Further, by reducing the fluid pressure, the abrasive 12 is buried in the fitting hole 5 of the electrode 4, and the polishing tool can be easily inserted into the cylindrical workpiece 1 without using a dedicated insertion guide. Although the number of the abrasives 12 is three in the above embodiment, it may be two or more. Also, a plurality of polishing tools may be connected. Further, the fluid may be liquid as well as gas.

[0014]

Since the present invention is constructed as described above, it has the following effects. In the inner surface composite polishing apparatus of the present invention, a plurality of abrasives 12 arranged on the peripheral surface of the cylindrical electrode 4 are attached to the front and rear diaphragms 7, respectively. 7 is supplied with fluid pressure through the fluid pressure supply hole 3 of the rotary shaft 2 and the communication hole 6 of the electrode 4, and each abrasive 12 is pressed against the inner surface of the cylindrical workpiece 1 by the front and rear diaphragms 7. The stability of the pressing force in the length direction of the abrasive 12 can be improved, the length of the abrasive 12 is not limited, and the polishing efficiency can be improved.

Further, the pressing force of the abrasive 12 can be arbitrarily adjusted by adjusting the fluid pressure, and a constant pressing force can be always given by increasing the fluid pressure as the abrasive 12 wears. The inner surface of 1 can be polished and finished with high precision. Further, by reducing the fluid pressure, the abrasive 12 is buried in the fitting hole 5 of the electrode 4, and the polishing tool can be easily inserted into the cylindrical workpiece 1 without using a dedicated insertion guide.

[Brief description of drawings]

FIG. 1 is a cutaway side view of one embodiment of the present invention.

FIG. 2 is a cut front view of FIG.

FIG. 3 is a partially enlarged view of another state of FIG.

[Explanation of symbols]

 1 Cylindrical Workpiece 2 Rotating Shaft 3 Fluid Pressure Supply Hole 4 Electrode 5 Fitting Hole 6 Communication Hole 7 Diaphragm 12 Abrasive Material

Claims (1)

[Claims] 1. A conductive rotating shaft having a fluid pressure supply hole formed therein, a cylindrical electrode attached to an end of the rotating shaft, and a front surface and a rear surface of the electrode at regular intervals on a circumferential surface of the electrode. A plurality of fitting holes formed, a communication hole formed in the electrode and communicating with the fluid pressure supply hole and the fitting holes, a diaphragm mounted in the fitting holes, and front and rear A cylindrical workpiece inner surface complex polishing apparatus, comprising: an abrasive material which is mounted on the upper surface of the diaphragm and is capable of being pressed against and released from the inner surface of the cylindrical workpiece.