JPH07204935A - Electropolishing device - Google Patents

Abstract

PURPOSE:To provide an electropolishing device capable of easily polishing a metal structure replica even if distances between turbine rotor blade grooves are short and its shape is complicated. CONSTITUTION:A device is formed with a polishing head 2, an electrolyte circulating unit 16, and a power supply 18. Also the polishing head 2 is provided with a holder 3 inserted into a rotor blade groove 1b, a chamber 4 provided with an electrode to supply power to electrolyte, a knob 6 to press the chamber 4 swinging in the longitudinal direction against the rotor blade groove, and a seal 7 connected to an electrolyte line, buried in the chamber 4, and made in contact with an object to be polished. Then the electrolyte fed from the electrolyte circulating unit 16 is made in contact with the object at a polishing port 8. Thus, when power is supplied from the power supply 18 to the electrolyte through the electrode, electropolishing is started by the principle of electrochemical machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic polishing apparatus used for polishing blade grooves of a turbine rotor.

[0002]

2. Description of the Related Art As a conventional method for polishing blade grooves of a turbine rotor, as shown in FIG. 4, a grindstone is manually rotated by a rotary grinder 19 or the like to remove surface scale, and then the grindstone is gradually made smaller. , It is common to finish the buffing.

[0003]

In the inspection inspection of the turbine rotor, a metallographic replica of the rotor blade groove is collected. Therefore, polishing is required after removing the surface scale, and the polishing work is performed manually as described in the section of the prior art. However, since the space between the blade grooves is narrow and has a complicated shape, it is difficult to monitor, and in order to prevent unnecessary cutting, it is necessary to have a skilled worker for this work.

Therefore, the present invention has been made in consideration of such an actual situation, and provides an electrolytic polishing apparatus capable of easily performing polishing for collecting a metal structure replica even if the blade grooves are narrow and the shape is complicated. The purpose is to

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is connected to a holder that can be inserted into a turbine rotor blade groove by a pin so that the holder swings back and forth. And a chamber provided with a conduit through which the electrolytic solution can circulate and an electrode for energizing the electrolytic solution in the conduit, a pressing means for pressing the chamber swinging back and forth against the turbine rotor blade groove, and embedding in the chamber A polishing head comprising a seal connected to the pipe line and in contact with a target portion, an electrolytic solution circulation unit for circulating an electrolytic solution to the polishing head, and a power supply for energizing the electrodes. It is an electrolytic polishing device that does.

[0006]

According to the above-mentioned means, the holder of the polishing head is inserted into the blade groove, and the chamber is pressed against the turbine rotor blade groove by the pressing means to fix the chamber. The electrolytic solution from the conduit in the chamber can contact the polishing target portion without leaking to the outside.

This electrolytic solution is circulated by the operation of an electrolytic solution circulating unit provided outside the polishing head, and reaches the polishing target portion through the above-mentioned seal. Also, for the electrodes in the conduit,
This is also energized by a power source provided outside the polishing head.
By energizing the electrolytic solution in this manner, it becomes possible to carry out electrolytic polishing by the known principle of electrolytic processing.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of an electrolytic polishing apparatus according to an embodiment of the present invention. As shown in the figure, the rotor blade groove 1b of the turbine rotor 1a has a complicated shape like a Christmas tree.
The surface is polished by electrolytic processing by the polishing head 2 inserted in the.

Next, the structure of the polishing head 2 will be described with reference to the front view of FIG. 2 and the transverse sectional view of FIG. Polishing head 2
Is composed of a holder 3 having a small size and a thin shape corresponding to the rotor blade groove 1b having a narrow and complicated shape and a shape corresponding to the unevenness of the blade groove 1b, and a chamber 4 made of Teflon having good corrosion resistance. . The chamber 4 is housed inside the holder 3, and its upper part is connected by two pins 5. Further, the holder 3 is provided with a screw type knob 6 as a pressing means, and by pushing the knob 6, the chamber 4 swings forward with the pin 5 as a fulcrum and spreads out. The holder 3 having such a mechanism can be laterally inserted into the rotor blade groove 1b in a state where the chamber 4 is housed. After the insertion, the holder 3 and the chamber 4 are spread by the knob 6, and when the chamber 4 is pushed forward by the reaction force, the Teflon rubber seal 7 embedded in the center of the chamber 4 becomes the polishing target portion of the rotor blade groove 1b. In close contact.
A polishing port 8 is opened at the center of the seal 7, and since the polishing port 8 is connected to a pipe line 9 in which the electrolytic solution in the chamber 4 circulates, the target portion in contact with the polishing port 8 is electropolished. The range is Inside the chamber 4, an electrode 10 for energizing the electrolytic solution penetrates through the center of the electrode holder 11,
It reaches the inside of the conduit 9 via a seal bush 12 and a bush 13 for preventing liquid leakage. The electrode 10 is made of platinum in consideration of the corrosion resistance of the material. Further, the conduit 9 is processed into a U shape so that the electrolytic solution can circulate in the chamber 4, and a liquid circulation hose 15 is connected to both ends of the conduit 9 via joints 14.

An electrolytic solution circulation unit 16 is connected to the opposite end of the liquid circulation hose 15 to form a loop, and the electrolytic solution is polished by the polishing head 2 by the operation of a circulation pump inside the hose 15.
Is supplied to. A power supply cable 17 is connected to the electrode 10 for supplying electricity to the electrolytic solution, and the rectified power is supplied from the power supply 18. With the electrolytic polishing apparatus having such a configuration, it is possible to perform the electrolytic polishing of the rotor blade groove 1b and reduce the size of the apparatus to be portable.

[0012]

According to the above-described electrolytic polishing apparatus of the present invention, anyone can perform the surface polishing work of the rotor blade groove, which conventionally requires a skilled worker, which reduces man-hours and reliability of inspection. Enable improvement.

It is also possible to reduce the size of the electrolytic polishing apparatus to a portable size.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an electrolytic polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing the polishing head of FIG.

FIG. 3 is a cross-sectional view showing the polishing head of FIG.

FIG. 4 is a situation diagram showing a conventional polishing operation method.

[Explanation of symbols]

 1a Turbine rotor 1b Rotor blade groove 2 Polishing head 3 Holder 4 Chamber 5 Pin 6 Knob (pressing means) 7 Seal 8 Polishing port 9 Pipe line 10 Electrode 15 Liquid circulation hose 16 Electrolyte circulation unit 17 Power supply cable 18 Power supply

Claims (1)

[Claims] 1. A holder which can be inserted into a turbine rotor blade groove, a pipe which is connected with a pin so as to swing back and forth inside the holder, through which an electrolyte can circulate, and an electrode which conducts electricity to the electrolyte in the pipe. A polishing head comprising a chamber provided with, a pressing means for pressing the chamber swinging back and forth against the turbine rotor blade groove, and a seal embedded in the chamber and connected to the pipe line and in contact with a target portion, An electrolytic polishing apparatus comprising an electrolytic solution circulation unit for circulating an electrolytic solution to the polishing head, and a power supply for energizing the electrodes.