JPH0325869Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a finishing polishing device for the inner surface of a curved tube that combines metal elution removal action by electrolytic action and abrasive grain abrasion action. The purpose is to save time.

As a straight pipe inner surface finish polishing device, the one shown in FIG. 1 has been considered. In the same figure,
1 is a metal straight pipe connected to the anode of a DC power supply, 2
3 is a central shaft connected to the cathode of the DC power source; 3 is a metal cylindrical electrode formed integrally with the central shaft 2 and has a diameter slightly smaller than the inner diameter of the straight pipe 1; 4 is a plurality of electrodes formed on the circumferential surface of the electrode 3. 6 is a water-permeable, insulating, and flexible abrasive material such as a nonwoven fabric attached to an abrasive grain attached to the entire outer peripheral surface of the electrode 3; 7 is an abrasive material formed on the lower surface of the electrode 3; 8 is an insulator formed on the upper surface of the electrode 3 and the circumferential surface of the central shaft 2; 9 is a supply path for the electrolytic solution 5 formed on the central shaft 2; the outlet 4 is connected to the supply path 9; It's communicating. Note that the electrolytic solution 5 is an aqueous solution of a neutral salt, and for example, NaNO ₃ , KNO ₃ , NaC, etc. are used.

Then, the electrode 3 is fed into the straight pipe 1 and then rotated, the electrolytic solution 5 is caused to reach the inner surface of the straight pipe 1 from the outlet 4 through the abrasive material 6, and a DC power is applied between the straight pipe 1 and the electrode 3, The inner surface of the straight pipe 1 is finished by moving the electrode 3 in one direction or reciprocating at a constant speed.

However, in the case of finishing the inner surface of a curved pipe, there are restrictions on the length of the electrode 3, and the method of feeding the electrolyte 5 becomes difficult.

This idea was made with the above points in mind, and consists of a metal cylindrical electrode with a diameter slightly smaller than the inner diameter of the curved pipe, and a metal cylindrical electrode with water permeability, insulation, and flexibility attached to the entire outer circumferential surface of the electrode. an abrasive having an abrasive material, an insulator formed on the upper and lower surfaces of the electrodes, and a connector that connects the plurality of electrodes inserted into the curved pipe so that they can be bent and rotated within a certain range;
a conductive material that electrically connects the electrodes; a support that is mechanically and electrically connected to the electrode at the uppermost end and rotates and reciprocates the electrodes; and a lower end of the curved pipe. a supply pump that supplies electrolytic solution into the bent pipe through the cover plate and discharges it from the upper end of the bent pipe;
The present invention provides an apparatus for finishing and polishing the inner surface of a curved tube, which includes the support tool and a power source applied to the curved tube.

Therefore, according to this invention, even in the case of a long curved pipe, by rotating and reciprocating the support, each electrode rotates and reciprocates, and the width of the reciprocating movement is also the same as that of each electrode. The distance between the electrodes is sufficient, the feeding mechanism for each electrode is simple, and the electrolyte is supplied from the lower end of the curved tube and discharged from the upper end of the curved tube.
Processing waste can be smoothly discharged, and since leakage current is prevented by the insulator, oxide film formation and pitting are suppressed, and processing time is shortened.

Next, this idea will be described in the second section showing one embodiment of the invention.
This will be explained in detail with reference to figures.

In the figure, 10 is a curved tube connected to the anode of a DC power supply, 11 is a metal cylindrical electrode with a diameter slightly smaller than the inner diameter of the curved tube 10, and 12 is a metal cylindrical electrode that is attached to the entire outer peripheral surface of the electrode and has abrasive grains attached to it. Water permeability of non-woven fabrics, etc.
An insulating and flexible abrasive material 13 is an insulator formed on the upper and lower surfaces of the electrode 11 to suppress the formation of an oxide film or the formation of pits due to leakage current. 14 is a U-shaped member attached to the upper and lower surfaces of the electrode 11, and 15 is an O-shaped member inserted through the U-shaped member 14 on the lower surface of the upper electrode 11 and the U-shaped member 14 on the upper surface of the lower electrode 11. It is a character-shaped member, and the connector 16 is configured to be bent and rotated within a certain range by two U-shaped members 14 and one O-shaped member 15, and the connector 16 is made of an insulator or an insulator. It is made of a material-covered metal body, and a plurality of electrodes 11 are vertically connected by a connecting tool 16. 17
18 is a conductive material such as an electric wire that electrically connects each adjacent electrode 11, and 18 is a connecting tool 1 that connects the uppermost electrode 11.
6, which is connected to the cathode of a DC power supply and supplies power to each electrode 11 through a conductive material 17.

19 is a lid plate that closes the lower end of the bent pipe 10; 20 is a tank for the electrolytic solution 5; and 21 is a port for transporting the electrolytic solution 5 in the tank 20 through the feed pipe 22, penetrating the lid plate 19, and into the bent pipe 10. A feeding pump 23 is a bent pipe 10
An electrode insertion guide attached to the upper end, 24 a receiver for receiving the electrolyte 5 flowing out from the guide 23, 25 a return pipe for returning the electrolyte 5 from the receiver 24 to the tank 20, and 26 an electrode on the upper surface of the tank 20. It is a filter for processing waste provided, and a tank 20 for processing waste.
Prevent inflow into the interior.

When finishing the inner surface of the curved tube 10, each electrode 11 is inserted into the curved tube 10, the support 18 is rotated to rotate each electrode 11, and the electrolyte 5 is pumped into the curved tube 10 by the pump 21. The electrodes 11 are fed from the lower end, a DC power is applied between the bent tube 10 and the support 18, and each electrode 11 is moved in one direction or reciprocated by the support 18 to finish the inner surface of the bent tube 10.

Therefore, according to the embodiment, even in the case of a long curved tube 10, the electrolytic solution 5 and processing waste smoothly move from the bottom to the top of the curved tube 10, and the electrode feeding mechanism also The equipment is simple, the processing time is significantly shortened, and the electrolyte
Since the electrolyte 5 is circulated, the amount of electrolyte 5 used is also small.

As described above, according to this invention, even in the case of a long curved pipe, by rotating and reciprocating the support, each electrode rotates and reciprocates, and the width of the reciprocating movement also changes for each electrode. , the feeding mechanism for each electrode can be simplified, and the electrolyte is supplied from the lower end of the curved tube and discharged from the upper end of the curved tube, making it possible to smoothly discharge machining waste. Furthermore, since the insulator prevents leakage current, it is possible to suppress the formation of an oxide film, the generation of pits, etc., and the processing time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of a polishing device for comparison with this invention, and FIG. 2 is a cutaway front view of one embodiment of the curved tube inner surface finish polishing device of this invention. 10... Bent pipe, 11... Electrode, 12... Abrasive material, 16
... Connecting tool, 17... Electrically conductive material.

Claims (1)

[Scope of utility model registration request] A metal cylindrical electrode with a diameter slightly smaller than the inner diameter of the curved pipe, and a water-permeable electrode attached to the entire outer peripheral surface of the electrode,
An abrasive material having insulating properties and flexibility, an insulator formed on the upper and lower surfaces of the electrode, and a plurality of the electrodes inserted into the bent tube are connected so as to be bendable and rotatable within a certain range. a connector, a conductive material that electrically connects each of the electrodes, a support that is mechanically and electrically connected to the uppermost electrode and rotates and reciprocates each of the electrodes by rotation and reciprocation; a lid plate that closes a lower end of the curved tube; a feed pump that supplies electrolyte through the lid plate into the curved tube and discharges it from the upper end of the curved tube; and a supply pump that applies an electrolytic solution to the support and the curved tube. A curved pipe inner surface finish polishing device equipped with a power supply.