Multi-runner blade inner cavity and air film hole abrasive particle flow polishing and grinding device and using method of multi-runner blade inner cavity and air film hole abrasive particle flow polishing and grinding device

Abstract

The invention belongs to a part surface treatment technology, and relates to a multi-runner blade inner cavity and air film hole abrasive particle flow polishing and grinding device and a using method. The device is composed of an upper hydraulic material grinding bin, a lower hydraulic material grinding bin and a blade workbench of abrasive particle flow equipment. The blade workbench can prevent pressure loss caused by abrasive leakage in abrasive flow polishing and grinding and meanwhile avoid flow offset caused by simultaneous entering of the abrasive at the communicating positions of inner cavity flow channels of a multi-flow-channel blade, so that all the flow channels of the blade have a good polishing and grinding effect. The defects that the inner cavity of the power turbine blade interferes with the air film hole wall structure, and the surface strengthening mode is unreachable are overcome, the grinding materials are made to move repeatedly in the inner cavity of the blade through repeated pressurization of the hydraulic cylinder, and the uniform strengthening effect is achieved at the inner cavity of the blade and the inner and outer hole openings of the air film hole. According to the method, only a small amount of grinding materials are consumed and are far less than vibration finishing grinding materials, the machining cost is lower, the dust amount is smaller, and noise is lower. According to the device, the inner cavity of the whole guide vane is strengthened within 20 min through abrasive flow, and the surface strengthening machining efficiency is high.

Description

Technical Field

[0001] The invention belongs to the part surface treatment technology, and relates to an abrasive flow polishing device for a multi-channel blade inner cavity and an air film hole and a use method thereof. Background Art

[0002] The service environment of multi-channel turbine blades is harsh. They are subjected to multiple loads such as their own cyclic loads and high-temperature corrosion of gas. They are prone to fatigue failure and have become one of the "life-limited parts" of aircraft engines, which has attracted great attention. Due to the need for cooling, the turbine rotor blades are designed as hollow structures. During the casting process, structures such as air film holes and air flow channels are prone to burrs on the hole wall and inside the channel, which affects the integrity of the blade inner cavity surface and weakens the fatigue performance of the blade. The reason is that the power turbine blades are cast blades, and the surface quality of their inner cavity is poor; at the same time, their air film holes are generally made by electric spark punching technology, which is easy to cause poor surface conditions such as large surface roughness and thick remelting layer on the inner wall of the air film hole. At the same time, the hole mouth in the air film hole has a high structural stress concentration coefficient. Under the action of alternating loads, the actual stress level of the hole mouth and the hole wall area is much higher than the external load, which is very likely to cause fatigue failure. Due to the complex shape of the inner cavity of the power turbine blade, traditional surface strengthening methods are not available, so a technology that can optimize the surface state of the inner cavity is needed.

[0003] At present, the commonly used surface strengthening method for the inner cavity is vibration finishing, that is, placing the part in a finishing machine and putting in the corresponding solid abrasive, and the finishing machine vibrates at high frequency to make the abrasive hit the inner surface of the part. However, the vibration finishing machine has particle size requirements for the abrasive (abrasives less than 1mm are difficult to excite to produce finishing effects). For parts with small orifice diameters (0.3-0.7mm) such as air film holes, the inner wall of the hole cannot be hit by the abrasive, and the effect of improving the surface state of the inner wall of the air film hole cannot be achieved. Therefore, patents such as CN202311507753.7 and CN115319646A reported the use of abrasive flow polishing to achieve polishing treatment on the inner surface of the blade. Although the above method can be used to polish the inner cavity of the blade and the air film hole, the poor sealing effect leads to a large loss of abrasive pressure and a weakened polishing effect; at the same time, for the polishing of the inner cavity of multi-channel blades, since the channels are connected, the abrasive entering from different channels will offset the flow at the point where the channels are connected, forming a stagnant liquid state, and there is no polishing effect on this area. Summary of the invention

[0004] The purpose of the present invention is to propose an abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes and a method of using the device, so as to overcome the problem that the inner cavity and air film holes of a power turbine blade cannot be strengthened by traditional surface strengthening methods, improve the surface quality of the inner cavity of the power turbine blade, and enhance the fatigue performance of the guide vane.

[0005] The technical scheme of the present invention is: a multi-channel turbine blade inner cavity and its air film hole abrasive flow polishing device, the polishing device is composed of two upper and lower hydraulic abrasive bins of the abrasive flow device and a blade workbench; the upper abrasive bin and the lower abrasive bin are respectively connected to the upper and lower abrasive inlets and outlets on the blade workbench, and the upper and lower hydraulic piston rods reciprocate to squeeze the abrasive through the blade workbench; the blade workbench includes an upper end inlet and outlet 1 of the abrasive blade, an upper sealing plate rubber ring 3, an upper sealing plate 4 of the blade body chamber, a blade body chamber 5, a lower sealing plate 6 of the blade body chamber, a sealing rubber of the flow channel a 7, a sealing rubber of the flow channel b 8, a sealing rubber of the flow channel c 9, a lower end abrasive inlet and outlet 11; the upper abrasive bin and the lower abrasive bin are respectively connected to the upper inlet and outlet 1 and the lower abrasive inlet and outlet 11 of the abrasive blade, the upper inlet and outlet 1 of the abrasive blade is fixedly connected to the upper sealing plate 4 of the blade body chamber, the upper sealing plate 4 of the blade body chamber and the upper sealing plate rubber ring 3 are fixed to the blade body chamber 5, and the lower sealing plate 6 of the blade body chamber is fixed to the blade body chamber 5 to achieve the sealing of the lower end of the blade body chamber 5; the lower abrasive inlet and outlet 11 is connected to the lower sealing plate 6 of the blade body chamber, the lower end of the lower sealing plate 6 of the blade body chamber is fitted with the flow channel a sealing rubber 7, the flow channel b sealing rubber 8, and the flow channel c sealing rubber 9, and the lower inlet and outlet 11 of the abrasive blade is fixedly connected to the lower sealing plate 6 of the blade body chamber.

[0006] Furthermore, a multi-channel turbine blade tenon profiling groove is formed at the upper end of the blade body chamber lower sealing plate 6, and three channels are formed at the bottom end of the groove to correspond to the three flow channel openings of the blade tenon.

[0007] Furthermore, the abrasive is a water-soluble liquid abrasive.

[0008] Furthermore, the water-soluble liquid abrasive is a combination of a water-soluble high molecular polymer and SiC and cubic boron nitride with a particle size of 5μm to 20μm; the abrasive flows through the inner cavity of the blade after being compressed by a hydraulic cylinder, and the pressure of the hydraulic cylinder is controlled to be 4 to 10MPa.

[0009] Furthermore, the inner cavity of the multi-channel turbine blade is divided into three channels, each channel is arranged in a zigzag pattern and interconnected at the tail end, and each channel is distributed with air film holes.

[0010] The method for using the abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes comprises the following steps:

[0011] Step 1: fix the multi-channel turbine blade on the contoured seat of the lower cover plate 6 of the blade body chamber, so that the three flow channels of the blade tenon are respectively and tightly connected with the three channels of the lower cover plate 6 of the blade body chamber;

[0012] Step 2: Connect the blade body chamber 5 to the upper sealing plate rubber ring 3, the blade body chamber upper sealing plate 4 and the blade body chamber lower sealing plate 6 respectively by bolts to form a blade body closed chamber;

[0013] Step 3: Put liquid abrasive into the abrasive bin;

[0014] Step 4: First, install the flow channel b sealing rubber 8 and the flow channel c sealing rubber 9 in the lower end abrasive inlet and outlet 11, then connect the lower sealing plate 6 of the blade body chamber with the lower end abrasive inlet and outlet 11 through bolts, turn on the power of the abrasive flow equipment, and the abrasive is reciprocated and squeezed under the drive of the hydraulic cylinder, so that the abrasive flows through the power turbine blade flow channel a and its air film hole, and reciprocates and polishes the cavity surface in the flow area;

[0015] Step 5 After step 4 is completed, replace the sealing rubber in the lower end abrasive inlet and outlet 11 to block the flow channels a, c and a, b respectively, so as to realize repeated polishing of the flow channels b and c and their air film holes;

[0016] Step 6: After polishing, turn off the power, remove the blade and clean the inner cavity of the blade.

[0017] Furthermore, since the inner cavity of the multi-channel turbine blade is divided into three channels, each channel is arranged in a zigzag pattern and interconnected at the tail end, and each channel is distributed with air film holes, three polishing abrasive flow directions are designed, namely:

[0018] 1) Polishing the multi-channel turbine blade flow channel 1a and its air film holes; installing and sealing the flow channel 2b sealing rubber 8 and the flow channel 3c sealing rubber 9, and during processing, using the liquid abrasive in the abrasive bin under the repeated action of the upper and lower cylinders, the abrasive repeatedly flows through the multi-channel turbine blade flow channel 1a and the blade body air film holes;

[0019] 2) Polishing of the multi-channel turbine blade flow channel 2b and its air film holes: install and seal the flow channel 1a sealing rubber 7 and the flow channel 3c sealing rubber 9. During processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower oil cylinders to make the abrasive repeatedly flow through the multi-channel turbine blade flow channel 2b and the air film holes of the blade body;

[0020] 3) Polishing of the multi-channel turbine blade flow channel 3c and its air film holes: install and seal the flow channel 1a sealing rubber 7 and the flow channel 2b sealing rubber 8. During processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower cylinders to make the abrasive repeatedly flow through the multi-channel turbine blade flow channel 3c and the blade body air film holes.

[0021] Furthermore, for the multi-channel turbine blade, each channel is reciprocated and extruded 8 to 16 times at a pressure of 4 to 10 MPa.

[0022] The advantages of the present invention are:

[0023] (1) A special sealing workbench for blades is designed to prevent pressure loss caused by abrasive leakage during abrasive flow polishing. At the same time, it avoids the flow cancellation caused by the simultaneous entry of abrasives into the flow channels of the multi-channel blade cavity, so that each flow channel of the blade has a better polishing effect.

[0024] (2) It overcomes the shortcomings of interference between the inner cavity of the power turbine blade and the wall structure of the air film hole, which is not achievable by traditional surface strengthening methods. By repeatedly applying pressure with a hydraulic cylinder, the abrasive is forced to move repeatedly in the inner cavity of the blade, so that a uniform strengthening effect is achieved at the inner cavity of the blade and the inner and outer openings of the air film hole.

[0025] (2) This method consumes only a small amount of abrasive (5 kg per hydraulic cylinder), which is far less than the abrasive used for vibration finishing, resulting in lower processing costs, less dust, and less noise. The device can strengthen the entire guide blade cavity with abrasive flow within 20 minutes, and the surface strengthening processing efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the whole device;

[0027] Figure 2 Schematic diagram of blade chamber;

[0028] Figure 3 Schematic diagram of polished tenon base;

[0029] Figure 4 Schematic diagram of the contoured lower cover plate of the blade chamber.

[0030] Among them: 1-abrasive blade upper inlet and outlet, 2-blade body chamber upper sealing plate screw, 3-upper sealing plate rubber ring, 4-blade body chamber upper sealing plate, 5-blade body chamber, 6-blade body chamber lower sealing plate, 7-flow channel a sealing rubber, 8-flow channel b sealing rubber, 9-flow channel c sealing rubber, 10-blade body chamber lower sealing plate screw, 11-lower end abrasive inlet and outlet, 12-lower end abrasive inlet and outlet fastening screw. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings:

[0032] like Figure 1-Figure 4 As shown, a multi-channel turbine blade inner cavity and its air film hole abrasive flow polishing device is composed of two upper and lower hydraulic abrasive bins of an abrasive flow device and a blade workbench; wherein the upper abrasive bin and the lower abrasive bin are respectively connected to the upper and lower abrasive inlets and outlets of the blade workbench, and the upper and lower hydraulic piston rods reciprocate to squeeze the abrasive through the blade workbench.

[0033] The blade workbench includes an upper inlet and outlet 1 of the abrasive blade, an upper sealing plate screw 2 of the blade body chamber, an upper sealing plate rubber ring 3, an upper sealing plate 4 of the blade body chamber, a blade body chamber 5, a lower sealing plate 6 of the blade body chamber, a flow channel a sealing rubber 7, a flow channel b sealing rubber 8, a flow channel c sealing rubber 9, a lower sealing plate screw 10 of the blade body chamber, a lower abrasive inlet and outlet 11 and a lower abrasive inlet and outlet fastening screw 12, a total of 12; wherein, the upper abrasive bin and the lower abrasive bin are respectively connected to the upper inlet and outlet 1 and the lower abrasive inlet and outlet 11 of the abrasive blade, the upper inlet and outlet 1 of the abrasive blade is fixedly connected to the upper sealing plate 4 of the blade body chamber, and the blade body cavity The upper sealing plate 4 and the upper sealing plate rubber ring 3 are fixed to the blade body chamber 5 by four blade body chamber upper sealing plate screws 2 to achieve the upper end sealing of the blade body chamber 5; the lower sealing plate 6 of the blade body chamber is fixed to the blade body chamber 5 by four blade body chamber lower sealing plate screws 10 to achieve the lower end sealing of the blade body chamber 5; the lower end abrasive inlet and outlet 11 is connected to the lower sealing plate 6 of the blade body chamber and three circular grooves are milled on the connection side with the flow channel a sealing rubber 7, the flow channel b sealing rubber 8, and the flow channel c sealing rubber 9, and the lower end abrasive blade inlet and outlet 11 is fixedly connected to the lower sealing plate 6 of the blade body chamber by the lower end abrasive inlet and outlet fastening screws 12.

[0034] A multi-channel turbine blade tenon profiling groove is opened at the upper end of the blade body chamber lower sealing plate 6, and three channels are opened at the bottom of the groove respectively corresponding to the three flow channel openings of the blade tenon. The lower end of the blade body chamber lower sealing plate 6 is fitted with flow channel a sealing rubber 7, flow channel b sealing rubber 8, and flow channel c sealing rubber 9. By controlling the filling of sealing rubbers 7, 8, and 9 respectively, abrasives can enter and exit the three flow channels at the blade tenon end at the same time or in sequence.

[0035] The abrasive material is a water-soluble liquid abrasive.

[0036] The water-soluble liquid abrasive is a combination of water-soluble high molecular polymer, SiC with a particle size of 5 μm to 20 μm, and cubic boron nitride. The abrasive flows through the inner cavity of the blade after being compressed by a hydraulic cylinder, and the pressure of the hydraulic cylinder is controlled to be 4 to 10 MPa.

[0037] The method for using the multi-channel turbine blade inner cavity and the air film hole abrasive flow polishing device is as follows: (1) the multi-channel turbine blade is fixedly mounted on the contour seat of the lower cover plate 6 of the blade body chamber, so that the three flow channels of the blade tenon are respectively connected to the channels of the lower cover plate 6 of the blade body chamber in a sealed manner;

[0038] (2) Connect the blade body chamber 5 to the upper sealing plate rubber ring 3, the blade body chamber upper sealing plate 4 and the blade body chamber lower sealing plate 6 respectively by bolts to form a blade body closed chamber;

[0039] (3) placing liquid abrasive in the abrasive bin;

[0040] (4) First, the flow channel b sealing rubber 8 and the flow channel c sealing rubber 9 are installed in the lower end abrasive inlet and outlet 11, and then the lower sealing plate 6 of the blade body chamber is tightly connected with the lower end abrasive inlet and outlet 11 by bolts, and the power of the abrasive flow device is turned on. The abrasive is reciprocated and squeezed under the drive of the hydraulic cylinder, so that the abrasive flows through the power turbine blade flow channel a and its air film hole, and the inner cavity surface of the flow area is reciprocated and polished;

[0041] (5) After step (4) is completed, replace the sealing rubber in the lower end abrasive inlet and outlet 11 to seal the flow channels a, c and a, b respectively, so as to achieve repeated polishing of the flow channels b and c and their air film holes;

[0042] (6) After polishing, turn off the power, remove the blade and clean the inner cavity of the blade.

[0043] Since the inner cavity of the multi-channel turbine blade is divided into three channels, each channel is arranged in a zigzag pattern and interconnected at the tail end, and each channel is distributed with air film holes, in order to ensure the surface polishing quality of each channel and air film hole of the turbine blade, improve the uniformity of the polishing effect, and prevent the abrasive from colliding in the channel and causing pressure offset, three polishing abrasive flow directions are designed, namely:

[0044] 1) For polishing the multi-channel turbine blade flow channel 1a and its air film holes: install and seal the flow channel 2b sealing rubber 8 and the flow channel 3c sealing rubber 9. During processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower cylinders, so that the abrasive repeatedly flows through the multi-channel turbine blade flow channel 1a and the blade body air film holes;

[0045] 2) For polishing the multi-channel turbine blade flow channel 2b and its air film holes: install and seal the flow channel 1a sealing rubber 7 and the flow channel 3c sealing rubber 9. During processing, the liquid abrasive in the abrasive bin is repeatedly acted on by the upper and lower cylinders to make the abrasive repeatedly flow through the multi-channel turbine blade flow channel 2b and the blade body air film holes;

[0046] 3) Polishing of the multi-channel turbine blade flow channel 3c and its air film holes: Install and seal the flow channel 1a sealing rubber 7 and the flow channel 2b sealing rubber 8. During processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower cylinders to make the abrasive repeatedly flow through the multi-channel turbine blade flow channel 3c and the blade body air film holes.

[0047] For multi-channel turbine blades, each channel is reciprocated and extruded 8 to 16 times at a pressure of 4 to 10 MPa.

[0048] The working principle of the present invention is:

[0049] Traditional surface strengthening methods are not effective for the inner cavities of complex parts. "Abrasive flow" is a non-Newtonian fluid composed of a uniform mixture of polymer carriers, abrasives and additives. It flows back and forth at high speed over the surface of the workpiece to be processed, producing a grinding effect to remove metal. Abrasive flow processing is a process in which special abrasives are guided through specific tooling, through the processed part of the inner cavity of the part, to deburr, polish and round the channel surface and corners. This process is particularly suitable for inner cavity shapes that are usually difficult to process. By controlling the flow direction of the polishing channel, extrusion pressure and polishing time, different types of sand, particle size, density and carrier viscosity can produce different grinding effects. During the abrasive flow machining process, there is a group of hydraulic cylinders and abrasive cylinders at the upper and lower parts. The inlet and outlet of each flow channel of the blade are controlled through a special workbench for the blade. During machining, the abrasive in the inner cavity is forced to flow through the flow channels and air film holes in the inner cavity of the blade under the repeated action of the upper and lower cylinders, so that the machined surface is continuously squeezed by the abrasive flow containing abrasive particles, so as to achieve the purpose of uniform machining of various cavity surfaces, thereby solving the problem of structural interference in complex inner cavities that is difficult to machine.

[0050] Example:

[0051] The multi-channel turbine blade processed in this embodiment has three tongue-and-groove channel outlets, of which the outlet of channel 1 is a round hole with a diameter of 2 mm, the outlet of channel 2 is a long strip hole with a length of 18 mm and a width of 2 mm, and the outlet of channel 3 is a round hole with a diameter of 2 mm. Therefore, a lower cover plate 6 of the blade body chamber that imitates the shape of the blade and sealing rubbers of the three channels are selected.

[0052] The multi-channel turbine blade is fixedly mounted on the contoured seat of the lower cover plate 6 of the blade body chamber, so that the three flow channels of the blade tenon are respectively and tightly connected with the channels of the lower cover plate 6 of the blade body chamber.

[0053] The blade body chamber 5 is connected to the upper sealing plate rubber ring 3, the blade body chamber upper sealing plate 4 and the blade body chamber lower sealing plate 6 respectively by bolts to form a blade body closed chamber.

[0054] Put liquid abrasive in the abrasive bin.

[0055] First, install the sealing rubber 8 of flow channel 2 and the sealing rubber 9 of flow channel 3 in the lower abrasive inlet and outlet 11, and then use bolts to tightly connect the lower sealing plate 6 of the blade body chamber with the lower abrasive inlet and outlet 11. Turn on the power of the abrasive flow equipment, and the abrasive is reciprocated and squeezed under the drive of the hydraulic cylinder, so that the abrasive flows through the flow channel 1 and the air film hole of the power turbine blade, and reciprocates and polishes the inner cavity surface of the flow area.

[0056] After the above steps are completed, replace the sealing rubber in the lower end abrasive inlet and outlet 11 to block the flow channels 1, 3 and 1, 2 respectively, so as to realize repeated polishing of the flow channels 2 and 3 and their air film holes. After polishing, turn off the power supply, remove the blade and clean the inner cavity of the blade.

Claims

1. A multi-channel turbine blade inner cavity and its air film hole abrasive flow polishing device, characterized in that: The polishing device is composed of two hydraulic abrasive bins above and below the abrasive flow device and a blade workbench; wherein the upper abrasive bin and the lower abrasive bin are respectively connected to the upper and lower abrasive inlets and outlets on the blade workbench, and the upper and lower hydraulic piston rods reciprocate to squeeze the abrasive through the blade workbench; the blade workbench comprises an upper abrasive blade inlet and outlet (1), an upper sealing plate rubber ring (3), an upper sealing plate of a blade body chamber (4), a blade body chamber (5), a lower sealing plate of a blade body chamber (6), a flow channel a sealing rubber (7), a flow channel b sealing rubber (8), a flow channel c sealing rubber (9), and a lower abrasive inlet and outlet (11); the upper abrasive bin and the lower abrasive bin are respectively connected to the upper abrasive blade outlet and the lower abrasive bin. The inlet (1) and the lower abrasive inlet and outlet (11) are connected; the upper inlet and outlet (1) of the abrasive blade is fixedly connected to the upper sealing plate (4) of the blade body chamber; the upper sealing plate (4) of the blade body chamber and the upper sealing plate rubber ring (3) are fixed to the blade body chamber (5); the lower sealing plate (6) of the blade body chamber is fixed to the blade body chamber 5 to achieve the sealing of the lower end of the blade body chamber (5); the lower abrasive inlet and outlet (11) is connected to the lower sealing plate (6) of the blade body chamber; the lower end of the lower sealing plate (6) of the blade body chamber is fitted with the flow channel a sealing rubber (7), the flow channel b sealing rubber (8) and the flow channel c sealing rubber (9); and the lower inlet and outlet (11) of the abrasive blade is fixedly connected to the lower sealing plate (6) of the blade body chamber.

2. The abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 1, characterized in that: The upper end of the lower cover plate (6) of the blade body chamber is provided with a multi-channel turbine blade tenon profiling groove, and the bottom end of the groove is provided with three channels corresponding to the three flow channel openings of the blade tenon.

3. The abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 1, characterized in that: The abrasive material is a water-soluble liquid abrasive.

4. The abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 1, characterized in that: The water-soluble liquid abrasive is a combination of water-soluble high molecular polymer, SiC with a particle size of 5μm to 20μm, and cubic boron nitride. The abrasive flows through the inner cavity of the blade after being compressed by a hydraulic cylinder, and the pressure of the hydraulic cylinder is controlled to be 4-10MPa.

5. The abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 1, characterized in that: The inner cavity of the multi-channel turbine blade is divided into three channels, each channel is arranged in a zigzag pattern and interconnected at the tail end, and each channel is distributed with air film holes.

6. A method for using a multi-channel turbine blade inner cavity and its air film hole abrasive flow polishing device according to any one of claims 1 to 5, characterized in that: (1) The multi-channel turbine blade is fixedly mounted on a contoured seat of a lower cover plate (6) of a blade body chamber, so that three channels of the blade tenon are respectively and tightly connected to three channels of the lower cover plate (6) of the blade body chamber; (2) connecting the blade body chamber (5) to the upper sealing plate rubber ring (3), the blade body chamber upper sealing plate (4) and the blade body chamber lower sealing plate (6) respectively by bolts to form a blade body closed chamber; (3) placing liquid abrasive in the abrasive bin; (4) First, flow channel b sealing rubber (8) and flow channel c sealing rubber (9) are installed in the lower end abrasive inlet and outlet (11), and then the lower sealing plate (6) of the blade body chamber is tightly connected with the lower end abrasive inlet and outlet (11) by bolts, and the power supply of the abrasive flow device is turned on. The abrasive is reciprocally squeezed under the drive of the hydraulic cylinder, so that the abrasive flows through the power turbine blade flow channel a and its air film hole, and the inner cavity surface of the flow area is reciprocally polished; (5) After step (4) is completed, replace the sealing rubber in the lower abrasive inlet and outlet (11) to seal the flow channels a, c and a, b respectively, so as to achieve repeated polishing of the flow channels b and c and their air film holes; (6) After polishing, turn off the power, remove the blade and clean the inner cavity of the blade.

7. The method for using the abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 6, characterized in that: Since the inner cavity of the multi-channel turbine blade is divided into three channels, each channel is arranged in a zigzag pattern and interconnected at the tail end, and each channel is provided with air film holes, three abrasive flow directions for polishing are designed, namely: 1) polishing the multi-channel turbine blade channel 1a and its air film holes; installing and sealing the channel 2b sealing rubber (8) and the channel 3c sealing rubber (9), and during processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower oil cylinders, so that the abrasive repeatedly flows through the multi-channel turbine blade channel 1a and the air film holes of the blade body; 2) For polishing the multi-channel turbine blade flow channel 2b and its air film holes: install and seal the flow channel 1a sealing rubber (7) and the flow channel 3c sealing rubber (9), and during processing, use the liquid abrasive in the abrasive bin to repeatedly flow through the multi-channel turbine blade flow channel 2b and the blade body air film holes under the repeated action of the upper and lower oil cylinders; 3) Polishing of the multi-channel turbine blade flow channel 3c and its air film holes: install and seal the flow channel 1a sealing rubber (7) and the flow channel 2b sealing rubber (8). During processing, the liquid abrasive in the abrasive bin is repeatedly acted upon by the upper and lower cylinders so that the abrasive repeatedly flows through the multi-channel turbine blade flow channel 3c and the blade body air film holes.

8. The method for using the abrasive flow polishing device for the inner cavity of a multi-channel turbine blade and its air film holes according to claim 6, characterized in that: For multi-channel turbine blades, each channel is reciprocated and extruded 8 to 16 times at a pressure of 4 to 10 MPa.

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