CN118305383A - Precise electrolytic machining device and method for blisk with air insulation protection narrow channel - Google Patents

Abstract

The present invention provides a precision electrolytic machining device and method for an integral blade disk with a narrow channel protected by air insulation. The electrolytic machining device of the present invention comprises a machine tool fixing component, a blade disk positioning and clamping component, an L-shaped cathode component, and a gas insulation protection component. The machine tool fixing component comprises a vertical spindle of the machine tool, a first spindle of the machine tool, and a second spindle of the machine tool. The blade disk positioning and clamping device is fixed on the vertical spindle of the machine tool, and the integral blade disk can be moved to a suitable position before machining to meet the machining requirements of the integral blade disk with a narrow channel. The L-shaped cathode device is fixed on the first spindle and the second spindle of the machine tool, and a channel is provided inside the L-shaped cathode device for electrolyte to flow through. The L-shaped cathode design processes the blade disk hub while machining the blades, thereby reducing subsequent machining steps and improving machining efficiency. The gas insulation protection component is fixed on the L-shaped cathode component, and high-pressure gas is introduced during machining to prevent stray corrosion of adjacent blades by the electrolyte, thereby improving the machining precision of the integral blade disk.

Description

Device and method for precise electrochemical machining of air-insulated narrow channel integral blade disk

Technical Field

The invention belongs to the technical field of numerically controlled electrolytic machining, and in particular relates to a device and method for precision electrolytic machining of an integral blade disk with a narrow passage protected by gas insulation.

Background technique

Compared with the traditional blade and disc combined structure, the integral blisk eliminates the airflow loss caused by the tongue and groove connection, greatly reduces the weight of parts, greatly simplifies the engine structure, improves the power-to-weight ratio, and extends the service life. It is the core component of the new aircraft engine.

Electrolytic machining is a machining method based on electrochemical anodic corrosion. Compared with traditional methods, it has the advantages of good machining surface quality, machining is not limited by the mechanical properties of the material, high machining efficiency, no residual stress on the workpiece surface after machining, and theoretically no tool cathode loss. It is considered to be an effective method for machining integral blades.

With the new engine's higher requirements for power-to-weight ratio, the integral blade disk has a trend of thinner and more curved blades, larger cross-section changes and narrower channels. It is also made of high-temperature alloy titanium alloy and other difficult-to-process materials, making it difficult to process and manufacture. The electrolytic machining of the integral blade disk is divided into two steps, namely channel rough machining and blade body fine machining. The blade body fine machining ultimately determines the machining accuracy of the integral blade disk.

In the precision electrolytic machining of integral blades, the machining process will cause stray corrosion to adjacent blades, which is not conducive to high-precision machining. The traditional method uses the method of inserting an insulating sleeve with a similar shape to the adjacent blades to prevent stray corrosion. This method has a certain effect when targeting blades with equal cross-sectional bending and torsion angles of zero, but each machining requires manual insertion of the insulating sleeve, which does not meet the requirements of efficient machining. When the blade is bent and twisted to a large extent and the channel is narrow, the method of inserting the insulating sleeve cannot meet the actual needs. Therefore, it is necessary to study a new method of insulating and protecting adjacent blades during the machining process to improve machining accuracy and efficiency.

In the previous precision electrolytic machining process of integral blades, after electrolytic rough machining and fine machining, milling is often required to carry out machining of the integral impeller hub. In order to reduce the machining process, it is necessary to study an electrolytic machining method that can simultaneously process the blade body and the impeller hub to improve the overall machining efficiency.

Summary of the invention

Purpose of the invention: The present invention provides a device and method for precision electrolytic machining of an integral blade disk with air insulation protection for narrow channels, which can improve the machining efficiency and machining accuracy of the integral blade disk with narrow channels.

Technical solution: A precision electrolytic machining device for a gas-insulated narrow channel integral blade disk, including a machine tool fixing component, a blade disk positioning and clamping component, an L-shaped cathode component, and a gas-insulated protection component.

Specifically, the machine tool fixing assembly includes a machine tool vertical spindle, a machine tool first spindle, and a machine tool second spindle, the blade disk positioning clamping assembly is fixed on the machine tool vertical spindle, and the gas insulation protection assembly is fixed on the L-shaped cathode assembly;

Specifically, the blade disc positioning and clamping assembly includes a blade disc positioning column and a blade disc clamping seat, the blade disc positioning column is rotatable and fixed on the vertical spindle of the machine tool, and the blade disc clamping seat is fixed on the blade disc positioning column;

Specifically, the L-shaped cathode assembly includes a first L-shaped three-dimensional curved cathode, a second L-shaped three-dimensional curved cathode, a liquid-through column, a liquid-through joint, a first cathode positioning clamping seat, and a second cathode positioning clamping seat. The first cathode positioning clamping seat and the second cathode positioning clamping seat are respectively fixed to the first spindle and the second spindle of the machine tool. The first L-shaped three-dimensional curved cathode and the second L-shaped three-dimensional curved cathode are respectively positioned on the first cathode positioning clamping seat and the second cathode positioning clamping seat. The liquid-through column is fixed on the first cathode positioning clamping seat, and the liquid-through joint is installed on the liquid-through column.

Specifically, the gas insulation protection component includes a first cathode ventilation column, a second cathode ventilation column, a first cathode ventilation interface, a second cathode ventilation interface, a first gas reversing seat, a second gas reversing seat, a first cathode gas end guide block, and a second cathode gas end guide block. The first cathode ventilation column and the second cathode ventilation column are respectively fixed on the first cathode positioning clamping seat and the second cathode positioning clamping seat, the first cathode ventilation interface and the second cathode ventilation interface are respectively installed on the first cathode ventilation column and the second cathode ventilation column, the first gas reversing seat and the second gas reversing seat are respectively fixed on the first cathode positioning clamping seat and the second cathode positioning clamping seat, the first cathode gas end guide block and the second cathode gas end guide block are respectively fixed on the first L-shaped three-dimensional curved cathode and the second L-shaped three-dimensional curved cathode.

Furthermore, the narrow channel integral blade disk includes blades and a blade disk hub.

Furthermore, the blade disc positioning and clamping assembly also includes a blade disc front end insulation cover and a blade disc rear end insulation cover, the blade disc front end insulation cover is fixed on the blade disc clamping seat, and the blade disc rear end insulation cover is fixed on the blade disc positioning column.

Furthermore, the insulation cover at the front end of the blade disk and the insulation cover at the rear end of the blade disk cover the non-processing area of the entire blade disk in the narrow channel.

Furthermore, the first cathode positioning clamping seat and the second cathode positioning clamping seat are fixed to the first spindle and the second spindle of the machine tool through a first quick-change chuck and a second quick-change chuck respectively.

Furthermore, the L-shaped cathode assembly also includes an insulating sleeve at the first cathode blade tip and an insulating sleeve at the second cathode blade tip, and the first insulating sleeve at the cathode blade tip and the second insulating sleeve at the cathode blade tip are respectively fixed on the first L-shaped three-dimensional curved cathode and the second L-shaped three-dimensional curved cathode.

Furthermore, the gas insulation protection assembly also includes a first sacrificial anode protection plate and a second sacrificial anode protection plate, and the first sacrificial anode protection plate and the second sacrificial anode protection plate are fixed on the first gas reversing seat and the second gas reversing seat respectively.

Furthermore, the upper end surfaces of the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode are structures with complementary shapes to the blade disk hub.

Furthermore, the first cathode ventilation column, the first cathode ventilation interface, the first gas reversing seat and the second cathode ventilation column, the second cathode ventilation interface, the second gas reversing seat respectively form two gas insulation protection flow channels.

The present invention also provides a method for precision electrochemical machining of the above-mentioned air-insulated protection narrow channel integral blade disk, comprising the following steps:

(1) Fix the first quick-change chuck and the second quick-change chuck on the first spindle and the second spindle of the machine tool respectively, then install the first cathode positioning clamping seat and the second cathode positioning clamping seat on the first quick-change chuck and the second quick-change chuck respectively, then install the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode on the first cathode positioning clamping seat and the second cathode positioning clamping seat respectively, then install the insulating sleeve at the tip of the first cathode and the insulating sleeve at the tip of the second cathode on the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode respectively, finally install the liquid column on the first cathode positioning clamping seat, and connect the liquid connection joint to the liquid column;

(2) The first cathode ventilation column, the second cathode ventilation column and the first gas reversing seat, the second gas reversing seat are fixed to the first cathode positioning clamping seat, the second cathode positioning clamping seat, and then the first cathode gas terminal guide block, the second cathode gas terminal guide block are fixed to the first L-shaped three-dimensional curved cathode, the second L-shaped three-dimensional curved cathode, and then the first sacrificial anode protection plate, the second sacrificial anode protection plate are fixed to the first gas reversing seat, the second gas reversing seat, and finally the first cathode ventilation interface, the second cathode ventilation interface are installed on the first cathode ventilation column, the second cathode ventilation column;

(3) Install the narrow channel integral blade disk on the blade disk positioning column, then install the insulation cover at the rear end of the blade disk on the blade disk positioning column, fix the blade disk clamping seat on the blade disk positioning column, fix the insulation cover at the front end of the blade disk on the blade disk clamping seat, and finally fix the blade disk positioning column on the vertical spindle of the machine tool;

(4) Start the electrolytic machining machine, start the machine heating system for preheating, wait for the electrolyte to reach 25-30°C, and start the electrolyte constant temperature system;

(5) Connect the narrow channel integral blade disk to the positive electrode of the machine tool, connect the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode to the negative electrode of the machine tool, and connect the first sacrificial anode protection plate and the second sacrificial anode protection plate to the positive electrode of the machine tool;

(6) Control the vertical spindle of the machine tool to move it to the position to be processed according to the set trajectory, then pre-flow the fluid, check the sealing of the fluid flow device, then stop the flow of fluid, pass high-pressure gas, check the sealing of the gas insulation protection component, control the first spindle and the second spindle of the machine tool to align the tool, and then set the electrolyte parameters;

(7) Electrolyte and high-pressure gas are introduced for processing. Under the action of electrochemical anode corrosion, the narrow channel integral blade disk with a certain margin is processed into the desired shape. After the first blade is processed, the liquid flow is stopped, the vertical spindle of the machine tool is controlled to make the narrow channel integral blade disk leave the processing area, and then the indexing axis of the machine tool is controlled to process the next blade.

(8) Repeat step (7) until all blades of the narrow channel integral blade disk are processed, then stop introducing electrolyte and high-pressure gas, remove the narrow channel integral blade disk, and turn off the machine tool.

Beneficial effects: The precision electrolytic machining device for the gas-insulated narrow channel integral blade disk of the present invention adopts an L-shaped cathode design. The top of the L-shaped cathode is designed with a cathode machining surface that matches the hub shape. The hub part is processed while the blade part of the narrow channel integral blade disk is processed. While ensuring the machining accuracy of the integral blade disk, the subsequent machining steps are reduced, and the machining efficiency is improved. The precision electrolytic machining method for the gas-insulated narrow channel integral blade disk of the present invention uses high-pressure gas to block the liquid rushing toward the roots of adjacent blades to prevent stray corrosion of the electrolyte to adjacent blades. At the same time, a sacrificial anode auxiliary anode plate is used to protect the adjacent blade body, avoiding repeated manual installation of insulation components, reducing the workload of operators, and improving machining accuracy and production efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a narrow channel integral blade disk of the present invention.

FIG. 2 is a schematic diagram of a precision electrolytic machining device according to the present invention.

FIG3 is a cross-sectional view of an L-shaped cathode assembly of a precision electrolytic machining device of the present invention.

FIG. 4 is a schematic diagram of the operation of the L-shaped cathode of the precision electrolytic machining device of the present invention.

Detailed ways

The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods.

The invention discloses a precision electrolytic machining device for a gas-insulated protection narrow channel integral blade disk, comprising a machine tool fixing component, a blade disk positioning clamping component, an L-shaped cathode component, and a gas-insulated protection component.

As shown in FIG. 1 , the narrow channel integral blade disk 1 includes a plurality of blades 29 and a blade disk hub 30 .

As shown in FIG2 , the machine tool fixed assembly includes a machine tool vertical spindle 10, a machine tool first spindle 26, and a machine tool second spindle 27, the blade disk positioning clamping assembly is fixed on the machine tool vertical spindle 10, the L-shaped cathode assembly is fixed on the machine tool first spindle 26, the machine tool second spindle 27, and the gas insulation protection assembly is fixed on the L-shaped cathode assembly;

The blisk positioning and clamping assembly includes a blisk positioning column 11, a blisk clamping seat 3, a blisk front end insulation cover 2, and a blisk rear end insulation cover 12. The blisk positioning column 11 is fixed on the vertical spindle 10 of the machine tool, the blisk clamping seat 3 is fixed on the blisk positioning column 11, the blisk front end insulation cover 2 is fixed on the blisk clamping seat 3, and the blisk rear end insulation cover 12 is fixed on the blisk positioning column 11. The blisk front end insulation cover 2 and the blisk rear end insulation cover 12 cover the non-processing area of the narrow channel integral blisk 1 to play a protective role.

As shown in Figure 3, the L-shaped cathode assembly includes a first L-shaped three-dimensional curved cathode 25, a second L-shaped three-dimensional curved cathode 22, a liquid column 6, a liquid joint 7, a first cathode positioning clamping seat 16, a second cathode positioning clamping seat 5, an insulating sleeve 24 at the first cathode blade tip, and an insulating sleeve 21 at the second cathode blade tip. The first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5 are respectively fixed on the first spindle 26 and the second spindle 27 of the machine tool. The first L-shaped three-dimensional curved cathode 25 and the second L-shaped three-dimensional curved cathode 22 are respectively positioned on the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5. The liquid column 6 is fixed on the first cathode positioning clamping seat 16. The liquid joint 7 is installed on the liquid column 6. The first cathode blade tip insulating sleeve 24 and the second cathode blade tip insulating sleeve 21 are respectively fixed on the first L-shaped three-dimensional curved cathode 25 and the second L-shaped three-dimensional curved cathode 22, so as to prevent stray corrosion of the blade 29 by the non-processing area of the cathode.

As shown in Figures 3 and 4, the gas insulation protection assembly includes a first cathode ventilation column 15, a second cathode ventilation column 28, a first cathode ventilation interface 18, a second cathode ventilation interface 9, a first gas reversing seat 14, a second gas reversing seat 4, a first cathode gas terminal guide block 23, a second cathode gas terminal guide block 20, a first sacrificial anode protection plate 13, and a second sacrificial anode protection plate 19. The first cathode ventilation column 15 and the second cathode ventilation column 28 are respectively fixed on the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5, and the first cathode ventilation interface 18 and the second cathode ventilation interface 9 are respectively installed on On the first cathode ventilation column 15 and the second cathode ventilation column 28, the first gas reversing seat 14 and the second gas reversing seat 4 are respectively fixed on the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5, the first cathode gas end guide block 23 and the second cathode gas end guide block 20 are respectively fixed on the first L-shaped three-dimensional curved cathode 25 and the second L-shaped three-dimensional curved cathode 22, the first sacrificial anode protection plate 13 and the second sacrificial anode protection plate 19 are respectively fixed on the first gas reversing seat 14 and the second gas reversing seat 4, and are connected to the positive pole of the power supply as insulation protection for the blade body part of the adjacent blade 29.

As shown in FIG4 , the upper end surfaces of the first L-shaped three-dimensional cathode curved surface 25 and the second L-shaped three-dimensional cathode curved surface 22 are designed and manufactured according to the shape of the impeller hub 30 . The impeller hub 30 is processed while the blades 29 are processed, which reduces the subsequent processing steps and improves the processing efficiency of the overall impeller of the narrow channel.

As shown in FIG4 , the first cathode ventilation column 15, the first cathode ventilation interface 18, the first gas reversing seat 14 and the second cathode ventilation column 28, the second cathode ventilation interface 9, and the second gas reversing seat 4 form two gas insulation protection flow channels. During the processing, high-pressure gas is introduced into the protection flow channels (the dotted arrow in the figure is the gas flow route), which can block the electrolyte from rushing to the root part of the adjacent blade 29 (the solid arrow in the figure is the electrolyte flow route), thereby achieving gas insulation protection for the root of the blade 29 and improving the processing accuracy of the narrow channel integral blade disk 1. The first gas reversing seat 14 and the second gas reversing seat 4 are used to reverse the high-voltage insulating gas while preventing the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5 from stray corrosion on the blade 29.

The present invention also provides a method for precision electrochemical machining of a gas-insulated narrow channel integral blade disk, comprising the following steps:

(1) The first quick-change chuck 17 and the second quick-change chuck 8 are fixed on the first spindle 26 and the second spindle 27 of the machine tool respectively, and then the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5 are installed on the first quick-change chuck 17 and the second quick-change chuck 8 respectively, and then the first L-shaped three-dimensional curved surface cathode 25 and the second L-shaped three-dimensional curved surface cathode 22 are installed on the first cathode positioning clamping seat 16 and the second cathode positioning clamping seat 5 respectively, and then the first cathode blade tip insulating sleeve 24 and the second cathode blade tip insulating sleeve 21 are installed on the first L-shaped three-dimensional curved surface cathode 25 and the second L-shaped three-dimensional curved surface cathode 22 respectively, and finally the liquid column 6 is installed on the first cathode positioning clamping seat 16, and the liquid connection joint 7 is connected to the liquid column 6;

(2) The first cathode ventilation column 15, the second cathode ventilation column 28 and the first gas reversing seat 14, the second gas reversing seat 4 are fixed to the first cathode positioning clamping seat 16, the second cathode positioning clamping seat 5, respectively, and then the first cathode gas terminal guide block 23, the second cathode gas terminal guide block 20 are fixed to the first L-shaped three-dimensional curved surface cathode 25, the second L-shaped three-dimensional curved surface cathode 22, respectively, and then the first sacrificial anode protection plate 13, the second sacrificial anode protection plate 19 are fixed to the first gas reversing seat 14, the second gas reversing seat 4, respectively, and finally the first cathode ventilation interface 18, the second cathode ventilation interface 9 are installed on the first cathode ventilation column 15, the second cathode ventilation column 28;

(3) Install the narrow channel integral blade disk 1 on the blade disk positioning column 11, then install the blade disk rear end insulation cover 2 on the blade disk positioning column 11, fix the blade disk clamping seat 3 on the blade disk positioning column 11, fix the blade disk front end insulation cover 2 on the blade disk clamping seat 3, and finally fix the blade disk positioning column 11 on the vertical spindle 10 of the machine tool;

(4) Start the electrolytic machining machine, start the machine heating system for preheating, wait for the electrolyte to reach 25-30°C, and start the electrolyte constant temperature system;

(5) Connect the narrow channel blisk 1 to the positive electrode of the machine tool, connect the first L-shaped three-dimensional curved cathode 25 and the second L-shaped three-dimensional curved cathode 22 to the negative electrode of the machine tool, and connect the first sacrificial anode protection plate 13 and the second sacrificial anode protection plate 19 to the positive electrode of the machine tool;

(6) Control the vertical spindle 10 of the machine tool to move it to the position to be processed according to the set trajectory, then pre-liquidate, check the sealing of the liquid-passing device, then stop the liquid-passing, pass high-pressure gas, check the sealing of the gas insulation protection component, control the first spindle 26 and the second spindle 27 of the machine tool to calibrate the tool, and then set the electrolyte parameters;

(7) Electrolyte and high-pressure gas are introduced for processing. Under the action of electrochemical anode corrosion, a blade 29 of the narrow channel integral blade disk 1 with a certain margin is processed into a desired shape. After the first blade is processed, the liquid flow is stopped, and the vertical spindle 10 of the machine tool is controlled to make the narrow channel integral blade disk 1 leave the processing area, and then the indexing axis of the machine tool is controlled to process the next blade 29.

(8) Repeat step (7) until all blades 29 of the narrow channel integral blade disk 1 are processed, then stop introducing the electrolyte and high-pressure gas, remove the narrow channel integral blade disk 1, and turn off the machine tool.

Claims (10)

1. The utility model provides a accurate electrolytic machining device of narrow passageway blisk of gas insulation protection which characterized in that includes: a vertical main shaft of a machine tool, a blade disc positioning and clamping assembly, an L-shaped cathode assembly and an air insulation protection assembly,

The blade disc positioning and clamping assembly is fixed on a vertical main shaft of the machine tool, and the air insulation protection assembly is fixed on the L-shaped cathode assembly;

The leaf disc positioning and clamping assembly comprises a leaf disc positioning column and a leaf disc clamping seat, wherein the leaf disc positioning column is rotatable and is fixed on a vertical main shaft of the machine tool; the leaf disc clamping seat is fixed on the leaf disc positioning column;

the L-shaped cathode assembly comprises a first L-shaped three-dimensional curved surface cathode, a second L-shaped three-dimensional curved surface cathode, a liquid passing column and a liquid passing connector, wherein the liquid passing connector is arranged on the liquid passing column;

The air insulation protection assembly comprises a first cathode ventilation column, a second cathode ventilation column, a first cathode ventilation interface, a second cathode ventilation interface, a first gas reversing seat, a second gas reversing seat, a first cathode gas tail end guide block and a second cathode gas tail end guide block, wherein the first cathode ventilation column and the second cathode ventilation column are respectively fixed on a first cathode positioning clamping seat and a second cathode positioning clamping seat, the first cathode ventilation interface and the second cathode ventilation interface are respectively arranged on the first cathode ventilation column and the second cathode ventilation column, and the first cathode gas tail end guide block and the second cathode gas tail end guide block are respectively fixed on a first L-shaped three-dimensional curved surface cathode and a second L-shaped three-dimensional curved surface cathode.

2. An electrolytic processing apparatus according to claim 1, wherein: the L-shaped cathode assembly further comprises a first cathode positioning clamping seat and a second cathode positioning clamping seat, the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode are respectively positioned on the first cathode positioning clamping seat and the second cathode positioning clamping seat, and the liquid passing column is fixed on the first cathode positioning clamping seat.

3. An electrolytic processing apparatus according to claim 1, wherein: the leaf disc positioning and clamping assembly further comprises a leaf disc front end insulating cover and a leaf disc rear end insulating cover, wherein the leaf disc front end insulating cover is fixed on the leaf disc clamping seat, and the leaf disc rear end insulating cover is fixed on the leaf disc positioning column.

4. An electrolytic processing apparatus according to claim 3, wherein: and the front end insulating cover of the blisk and the rear end insulating cover of the blisk cover the non-processing area of the blisk in the narrow channel.

5. An electrolytic processing apparatus according to claim 2, wherein: the first cathode positioning clamping seat and the second cathode positioning clamping seat are respectively connected with a first quick-change chuck and a second quick-change chuck.

6. An electrolytic processing apparatus according to claim 1, wherein: the L-shaped cathode assembly further comprises a first cathode blade tip insulating sleeve and a second cathode blade tip insulating sleeve, and the first cathode blade tip insulating sleeve and the second cathode blade tip insulating sleeve are respectively fixed on the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode.

7. An electrolytic processing apparatus according to claim 1, wherein: the gas insulation protection assembly further comprises a first sacrificial anode protection plate and a second sacrificial anode protection plate, and the first sacrificial anode protection plate and the second sacrificial anode protection plate are respectively fixed on the first gas reversing seat and the second gas reversing seat.

8. An electrolytic processing apparatus according to claim 2, wherein: the upper end surfaces of the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode and the blade disc hub are in a structure with complementary shapes.

9. An electrolytic processing apparatus according to claim 1, wherein: the first cathode ventilation column, the first cathode ventilation interface, the first gas reversing seat, the second cathode ventilation column, the second cathode ventilation interface and the second gas reversing seat respectively form two gas insulation protection flow passages.

10. A method of using the gas insulated protective narrow channel blisk precision electrolytic machining apparatus of any one of claims 1 to 9, characterized by: the method comprises the following steps:

(1) The insulation sleeve at the tip of the first cathode and the insulation sleeve at the tip of the second cathode are respectively arranged on the first L-shaped three-dimensional curved surface cathode and the second L-shaped three-dimensional curved surface cathode, and the liquid passing joint is connected to the liquid passing column;

(2) The first cathode gas end guide block and the second cathode gas end guide block are respectively fixed on a first L-shaped three-dimensional curved surface cathode and a second L-shaped three-dimensional curved surface cathode, and then the first cathode ventilation interface and the second cathode ventilation interface are arranged on a first cathode ventilation column and a second cathode ventilation column;

(3) Mounting the whole She Panan of the narrow channel on a leaf disc positioning column, fixing a leaf disc clamping seat on the leaf disc positioning column, and then fixing the leaf disc positioning column on a vertical main shaft of a machine tool;

(4) Starting an electrolytic machining machine tool, starting a machine tool heating system to preheat, and starting an electrolyte constant temperature system when the electrolyte is machined to 25-30 ℃;

(5) Connecting a narrow-channel blisk with the positive electrode of the machine tool, and connecting a first L-shaped three-dimensional curved surface cathode and a second L-shaped three-dimensional curved surface cathode with the negative electrode of the machine tool;

(6) Controlling a vertical main shaft of a machine tool to move to a position to be processed according to a set track, then pre-introducing liquid, checking the tightness of a liquid introducing device, stopping introducing liquid, introducing high-pressure gas, checking the tightness of a gas insulation protection assembly, controlling the machine tool to perform tool setting, and then setting electrolyte parameters;

(7) And (3) introducing electrolyte and high-pressure gas to process, under the electrochemical anode corrosion effect, processing the narrow-channel blisk with a certain margin into a required shape, stopping introducing the electrolyte after the first blade is processed, controlling a vertical spindle of a machine tool to enable the narrow-channel blisk to leave a processing area, and then controlling the machine tool to process the next blade.

(8) And (3) repeating the step (7) until all blades of the blisk of the narrow channel are processed, stopping introducing electrolyte and high-pressure gas, taking out the blisk of the narrow channel, and closing the machine tool.