Gas-driven abrasive particle polishing device and method for turbine blade inner cavity and gas film hole

Abstract

The invention relates to the technical field of aero-engine turbine blade machining, and discloses a gas-driven abrasive particle polishing device for an inner cavity and a gas film hole of a turbine blade, the gas-driven abrasive particle polishing device comprises a box body and a clamping assembly arranged in the inner cavity of the box body and used for clamping the turbine blade, and polishing output assemblies are arranged on the two sides of the box body in a penetrating mode. The inlet end of the polishing output assembly communicates with an abrasive particle mixing assembly, the abrasive particle mixing assembly is used for feeding abrasive particles and gas into the polishing output assembly after the abrasive particles and the gas are pressurized and mixed, and the outlet end of the polishing output assembly is divided into two paths to communicate with the two sides of the turbine blade; and a collector for collecting discharged abrasive particles is arranged at the lower part of the box body. The polishing device is simple in overall structure, low in technical requirement for workers, easy and convenient to operate by the workers, single in polishing medium and low in manufacturing cost; the polishing medium is convenient to recycle without additional processing and recycling; two-way air inlet is achieved, and the polishing efficiency is high; the blade clamp is large in clamping range, suitable for installing different types of blades and easy, convenient and efficient to replace.

Description

Technical Field

[0001] The invention relates to the technical field of machining turbine blades of aircraft engines, and in particular to a gas-driven abrasive polishing device and method for an inner cavity and an air film hole of a turbine blade. Background Art

[0002] At present, turbine blades are very critical components in aircraft engines, and their performance plays a decisive role in the working efficiency and working safety of aircraft engines. However, since turbine blades work in a high temperature and high pressure environment for a long time, the air film holes are often blocked due to external impurities entering with the air flow, resulting in a large amount of accumulation of deposits on the blade surface, which in turn leads to a decrease in the air temperature cooling performance of the turbine blades, affecting the normal operation of the engine. In addition to ensuring the processing requirements, the existing polishing devices have many types of polishing media and cumbersome devices, which are inconvenient for workers to operate and affect the processing efficiency, and have high manufacturing costs. At the same time, due to the complex structure of turbine blades, conventional polishing devices are difficult to perform comprehensive and thorough polishing operations on turbine blades. Therefore, based on the above statements, the present invention provides a simple, efficient, and processing-compliant turbine blade air film hole polishing method and device. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a gas-driven abrasive polishing device and method for the inner cavity and air film holes of turbine blades, which solves the problem that the existing polishing processing devices are difficult to perform efficient and comprehensive polishing operations on the air film holes of turbine blades with complex structures.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A gas-driven abrasive polishing device for the inner cavity and air film holes of a turbine blade comprises a housing and a clamping assembly arranged in the inner cavity of the housing for clamping the turbine blade, polishing output assemblies are provided on both sides of the housing, an inlet end of the polishing output assembly is connected to an abrasive mixing assembly, the abrasive mixing assembly is used to pressurize and mix abrasive and gas and then send them into the polishing output assembly, an outlet end of the polishing output assembly branches into two paths and is connected to both sides of the turbine blade, and the mixed gas abrasive is discharged from the air film holes; a collector for collecting the discharged abrasive is arranged at the lower part of the housing; the clamping assembly comprises a first clamping assembly and a second clamping assembly, the first clamping assembly comprises a V-shaped clamping block matching the side shape of the turbine blade and a threaded screw driving the V-shaped clamping block to move in a directional manner, the second clamping assembly comprises a clamping plate and a threaded rod driving the clamping plate to move in a directional manner, the clamping plate and the V-shaped clamping block respectively contact and clamp the four sides of the upper part of the turbine blade.

[0005] Preferably, the first clamping assembly also includes a sleeve fixedly connected to the V-shaped clamp block, the sleeve is threadedly connected to one end of the threaded screw, and an external thread opposite to the thread direction of the inner cavity of the sleeve is arranged at the end of the threaded screw, and the threaded screw is fixed close to the outer surface of the box body by a fastening nut and a spring washer.

[0006] Preferably, the second clamping assembly further comprises symmetrically arranged sliding rods, the sliding rods penetrate the clamping plates and are fixedly mounted on the cavity wall of the box body, and the threaded rods are threadedly connected to the clamping plates.

[0007] Preferably, the polishing output assembly includes two side pipes and a shunt pipe, the shunt pipe is connected to the abrasive mixing assembly through a pipeline, the two side pipes are inserted into the inner cavity of the turbine blade and are connected to the air film holes thereon, and the pressurized mixed abrasive enters the inner cavity of the turbine blade through the two side pipes.

[0008] Preferably, the abrasive mixing assembly includes a storage tank and a circulation pipe connected to the storage tank, the circulation pipe is externally connected to a booster air pump through an air inlet pipe, a plurality of dispersion funnels are arranged on the circulation pipe, the circulation pipe is connected to the storage tank through an air outlet pipe, the inner cavity of the storage tank is volute-shaped and is arranged with corresponding channels, an output pipe is arranged in the outlet direction of the channel, the output pipe is connected to the diversion pipe through a buffer pipe, and the mixed abrasive travels in the channel along the airflow direction and is blown out from the output pipe after being mixed.

[0009] Preferably, the circulating pipe is fixedly mounted on the upper end surface of the storage tank via a mounting bracket, a pressure gauge for detecting the internal air pressure value of the storage tank is provided on the storage tank, and a rotary switch is arranged on the buffer pipe.

[0010] Preferably, the upper portion of the clamp is provided with a semicircular opening matching the through pipes on both sides, and the through pipes on both sides passing through the semicircular opening are clamped and fixed on the clamp by means of a fastening clamp and screws.

[0011] A method for gas-driven abrasive polishing of the inner cavity and air film holes of a turbine blade, wherein the turbine blade is polished by the gas-driven abrasive polishing device for the inner cavity and air film holes of a turbine blade as described in any one of the above technical solutions, specifically comprising the following steps: S1: Open the box cover, place the turbine blade in a proper position inside the box, move the clamping plates on both sides through the threaded rod, and clamp the front and rear ends of the turbine blade; S2: Adjust the first clamping assembly to make it horizontal, move the V-shaped clamp block through the threaded screw, clamp the left and right ends of the turbine blade, and connect and fix them through the fastening nut and spring washer; S3: insert the through pipes on both sides into the turbine blades, extend them into the inner cavity of the turbine blades for a certain length, and fix them with fastening clips; S4: Return the upper cover of the box to its original position to form a sealed cavity inside the box; S5: The through pipes on both sides are connected to the buffer pipe through the diverter and connected to the output pipe of the storage tank; S6: Let the gas enter the circulation tube through the air inlet pipe at the upper end of the circulation tube at a certain angle, close the rotary switch of the buffer tube to form a closed chamber, and turn on the pressure gauge; S7: Add the pre-treated dry abrasive into the dispersion funnel, and flow along the air flow direction, enter the storage tank through the air outlet pipe at the lower end of the circulation pipe, and form a gas-abrasive mixing chamber; S8: When the actual number on the pressure gauge reaches the allowable value, turn on the rotary switch on the buffer pipe. The mixed gas particles follow the direction of the air flow through the two side pipes at both ends of the diversion pipe and enter from both sides of the turbine blade and pass through the air film hole.

[0012] The present invention has the following beneficial effects: The gas-driven abrasive polishing device and method for the inner cavity and air film hole of the turbine blade can ensure the stable clamping of the turbine blade by adjusting the threaded screw and the threaded rod through the V-shaped clamp block and the clamp plate, and the overall clamping range is large, which is suitable for installing different types of blades, and the replacement is simple and efficient; through the set abrasive mixing component and polishing output component, the abrasive and gas can be pressurized and mixed, and the mixed gas abrasive enters from both sides of the turbine blade through the pipeline along the air flow direction, and finally passes through the air film hole to achieve efficient polishing of the inside of the turbine blade; through the set collector, the abrasive discharged from the air film hole on the turbine blade can be uniformly collected, and the overall recovery is convenient, which improves the collection efficiency. The overall structure of the device is simple, the technical requirements for workers are not high, the workers are easy to operate, the polishing medium is single, and the manufacturing cost is low; the polishing medium is easy to recover, and no additional processing and recovery is required; two-way air intake, high polishing efficiency; the blade clamp has a large clamping range, which is suitable for installing different types of blades, and the replacement is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the layout structure of the clamping assembly of the present invention; Figure 3 A schematic diagram of the overall structure of the turbine blade processed by the present invention; Figure 4 This is a schematic diagram of the polishing processing state structure of the present invention; Figure 5 It is a schematic diagram of the layout structure of the clamping assembly, the abrasive mixing assembly and the polishing output assembly of the present invention; Figure 6It is a schematic diagram of the split structure of the first clamping component and the second clamping component of the present invention.

[0014] In the figure: 1. box body; 11. cover body; 2. first clamping assembly; 21. threaded screw; 22. fastening nut; 23. sleeve; 24. V-shaped clamp; 3. second clamping assembly; 31. threaded rod; 32. clamping plate; 33. sliding rod; 34. fastening clamp; 4. abrasive mixing assembly; 41. storage tank; 42. circulation pipe; 43. air inlet pipe; 44. mounting bracket; 45. dispersion funnel; 46. air outlet pipe; 47. pressure gauge; 48. output pipe; 5. polishing output assembly; 51. buffer pipe; 52. rotary switch; 53. shunt pipe; 54. two-side through pipes; 6. conical connecting pipe; 7. collector; 8. support base. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1 The present invention provides a technical solution: a gas-driven abrasive polishing device for the inner cavity and air film hole of a turbine blade, comprising a housing 1 and a clamping assembly arranged in the inner cavity of the housing 1 for clamping the turbine blade, polishing output assemblies 5 are provided on both sides of the housing 1, and the inlet end of the polishing output assembly 5 is connected with an abrasive mixing assembly 4, the abrasive mixing assembly 4 is used to pressurize and mix abrasive particles with gas and then send them into the polishing output assembly 5, the outlet end of the polishing output assembly 5 is divided into two paths and communicated with both sides of the turbine blade, and the mixed gas abrasive particles are discharged from the air film hole; a collector 7 for collecting and discharging abrasive particles is arranged at the lower part of the housing 1; the clamping assembly comprises a first clamping assembly 2 and a second clamping assembly 3, the first clamping assembly 2 comprises a V-shaped clamping block 24 matching the side shape of the turbine blade and a threaded screw 21 driving the V-shaped clamping block 24 to move in a directional manner, the second clamping assembly 3 comprises a clamping plate 32 and a threaded rod 31 used to drive the clamping plate 32 to move in a directional manner, the clamping plate 32 and the V-shaped clamping block 24 respectively contact and clamp the four sides of the upper part of the turbine blade.

[0017] The present invention, through the V-shaped clamp block 24 and the clamp plate 32, can design a clamping assembly that matches the shape of the turbine blade, so as to ensure that the turbine blade is stably clamped by adjusting the threaded screw 21 and the threaded rod 31, and the overall clamping range is large, which is suitable for installing different types of blades, and the replacement is simple and efficient; through the abrasive mixing assembly 4 and the polishing output assembly 5, the abrasive and gas can be pressurized and mixed, and the mixed gas abrasive enters from both sides of the turbine blade through the pipeline along the air flow direction, and finally passes through the air film hole to achieve efficient polishing of the inside of the turbine blade; through the collector 7, the abrasive discharged from the air film hole on the turbine blade can be uniformly collected, and the overall recovery is convenient, and the collection efficiency is improved. The overall structure of the device is simple, the technical requirements for workers are not high, the workers are easy to operate, the polishing medium is single, and the manufacturing cost is low; the polishing medium is easy to recycle, and no additional processing and recycling is required; the two-way air intake has high polishing efficiency; the blade clamp has a large clamping range, which is suitable for installing different types of blades, and the replacement is simple and efficient.

[0018] Reference Figure 2 , 4 As shown in Figure 5, in this embodiment, the first clamping assembly 2 also includes a sleeve 23 fixedly connected to the V-shaped clamp block 24. The sleeve 23 is threadedly connected to one end of the threaded screw 21, and an external thread opposite to the thread direction of the inner cavity of the sleeve 23 is arranged at the end of the threaded screw 21. The threaded screw 21 is fixed by a fastening nut 22 in cooperation with a spring washer near the outer surface of the housing 1. By turning the threaded screw 21, the sleeve 23 and the V-shaped clamp block 24 thereon are driven to clamp and fix the turbine blades. Since one end of the threaded screw 21 is arranged with a thread in the opposite direction of the inner cavity of the sleeve 23, the threaded screw 21 does not disengage from the sleeve 23 when it moves forward or backward along the sleeve 23; the fastening nut 22 provided in cooperation with the spring washer can play a role in fixing the threaded screw 21.

[0019] Reference Figure 4 and 5 As shown, in this embodiment, the second clamping assembly 3 also includes a symmetrically arranged slide bar 33, which passes through the clamping plate 32 and is fixedly mounted on the cavity wall of the box body 1, and the threaded rod 31 is threadedly connected to the clamping plate 32. Through the provision of the threaded rod 31 and the slide bar 33, the clamping plate 32 can move forward and backward along the axial direction of the slide bar 33 to clamp or loosen the turbine blade, and then cooperate with the first clamping assembly 2 to stably clamp and fix turbine blades of different sizes and types, so as to subsequently perform efficient polishing on the inner cavity of the air film hole on the turbine blade.

[0020] In this embodiment, the polishing output assembly 5 includes two side through pipes 54 and a diverter pipe 53. The diverter pipe 53 is connected to the abrasive mixing assembly 4 through a pipeline. The two side through pipes 54 are inserted into the inner cavity of the turbine blade and are connected to the air film holes thereon. The pressurized mixed abrasive enters the inner cavity of the turbine blade through the two side through pipes 54.

[0021] Reference Figure 4 and 5 As shown, in this embodiment, the abrasive mixing assembly 4 includes a storage tank 41 and a circulation pipe 42 connected to the storage tank 41. The circulation pipe 42 is externally connected to a booster air pump through an air inlet pipe 43. A plurality of dispersion funnels 45 are arranged on the circulation pipe 42. The circulation pipe is connected to the storage tank 41 through an air outlet pipe 46. The inner cavity of the storage tank 41 is in a volute shape and is arranged with corresponding channels. An output pipe 48 is arranged in the outlet direction of the channel. The output pipe 48 is connected to the diversion pipe 53 through a buffer pipe 51. The mixed abrasive travels in the channel along the air flow direction and is mixed, and then is blown out from the output pipe 48. By setting up the circulation pipe 42 and the dispersion funnel 45, abrasive particles can be poured into the circulation pipe 42 at multiple points simultaneously, which effectively increases the pouring efficiency. At the same time, driven by the high-pressure gas delivered by the air inlet pipe 43, the high-pressure gas and the abrasive particles move along the circulation pipe 42 and are mixed together into the storage tank 41; through the volute-shaped inner cavity arranged in the inner cavity of the storage tank 41, the mixed abrasive particles move along the channel of the volute-shaped inner cavity, so as to be fully mixed and then blown into the buffer pipe 51 from the output pipe 48 along the channel with increased pressure.

[0022] In this embodiment, the circulating pipe 42 is fixedly mounted on the upper end surface of the storage tank 41 by means of a mounting bracket 44 . The storage tank 41 is provided with a pressure gauge 47 for detecting the internal air pressure value of the storage tank 41 . The buffer pipe 51 is provided with a rotary switch 52 .

[0023] Reference Figure 4 and 6 As shown, in this embodiment, the upper part of the clamping plate 32 is provided with a semicircular opening matching with the through tubes 54 on both sides, and the clamping plate 32 is clamped and fixed with the through tubes 54 on both sides passing through the semicircular opening by the fastening clamps 34 and the screws. The semicircular opening and the fastening clamps 34 can be used to clamp and fix the through tubes 54 on both sides connected with the turbine blades, effectively preventing the through tubes 54 on both sides from being ejected from the inner cavity of the turbine blade due to excessive air pressure in the through tubes 54, thereby affecting the subsequent normal polishing process.

[0024] In this embodiment, a conical connecting pipe 6 is provided at the lower part of the inner cavity of the box body 1 , and the mixed abrasive falls into the collector 7 from the conical connecting pipe 6 . The box body 1 is arranged on a supporting base 8 .

[0025] A method for gas-driven abrasive polishing of a turbine blade inner cavity and air film holes, characterized in that the turbine blade is polished by the gas-driven abrasive polishing device for the inner cavity and air film holes of the turbine blade according to any one of the above embodiments, specifically comprising the following steps: S1: Open the cover of the box 1, place the turbine blade at an appropriate position inside the box 1, and move the clamping plates 32 on both sides through the threaded rod 31 to clamp the front and rear ends of the turbine blade; S2: Adjust the first clamping assembly 2 to make it horizontal, move the V-shaped clamp block 24 through the threaded screw 21, clamp the left and right ends of the turbine blade, and connect and fix them through the fastening nut 22 and the spring washer; S3: insert the through pipes 54 on both sides into the turbine blades, extend them into the inner cavity of the turbine blades for a certain length, and fix them by clamping with the fastening clamps 34; S4: Return the upper cover of the box body 1 to its original position to form a sealed cavity inside the box body 1; S5: The two-side through pipes 54 are connected to the buffer pipe 51 through the flow divider and connected to the output pipe 48 of the storage tank 41; S6: The gas enters the circulation pipe 42 at a certain angle through the air inlet pipe 43 at the upper end of the circulation pipe 42, the rotary switch 52 of the buffer pipe 51 is closed to form a closed chamber, and the pressure gauge 47 is turned on; S7: Add the pre-treated dry abrasive into the dispersion funnel 45, and flow along the air flow direction, through the outlet pipe 46 at the lower end of the circulation pipe 42 into the storage tank 41, forming a gas-abrasive mixing chamber; S8: When the pressure gauge 47 shows the allowable value, the rotary switch 52 on the buffer tube 51 is turned on, and the mixed gas particles enter from both sides of the turbine blade through the two-side through pipes 54 at both ends of the shunt tube 53 along the direction of the gas flow and pass through the air film holes.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas-driven abrasive polishing device for the inner cavity and air film holes of a turbine blade, comprising a housing and a clamping assembly arranged in the inner cavity of the housing for clamping the turbine blade, characterized in that: Polishing output components are provided on both sides of the box body, and the inlet end of the polishing output component is connected to an abrasive mixing component, and the abrasive mixing component is used to pressurize and mix the abrasive and gas and then send them into the polishing output component, and the outlet end of the polishing output component is divided into two paths and connected to both sides of the turbine blade, and the mixed gas and abrasive are discharged from the air film hole; a collector for collecting the discharged abrasive is arranged at the lower part of the box body; the clamping component includes a first clamping component and a second clamping component, the first clamping component includes a V-shaped clamping block matching the side shape of the turbine blade and a threaded screw driving the V-shaped clamping block to move in a directional manner, and the second clamping component includes a clamping plate and a threaded rod driving the clamping plate to move in a directional manner, and the clamping plate and the V-shaped clamping block respectively contact and clamp the upper part of the turbine blade.

2. A gas-driven abrasive polishing device for turbine blade inner cavity and air film hole according to claim 1, characterized in that: The first clamping assembly also includes a sleeve fixedly connected to the V-shaped clamp block, the sleeve is threadedly connected to one end of the threaded screw, and an external thread opposite to the thread direction of the inner cavity of the sleeve is arranged at the end of the threaded screw. The threaded screw is fixed close to the outer surface of the box body by a fastening nut and a spring washer.

3. A gas-driven abrasive polishing device for turbine blade inner cavity and air film hole according to claim 1 or 2, characterized in that: The second clamping assembly further comprises symmetrically arranged sliding rods, which penetrate through the clamping plates and are fixedly mounted on the cavity wall of the box body, and the threaded rods are threadedly connected to the clamping plates.

4. A gas-driven abrasive polishing device for turbine blade inner cavity and air film hole according to claim 3, characterized in that: The polishing output assembly includes two side pipes and a shunt pipe. The shunt pipe is connected to the abrasive mixing assembly through a pipeline. The two side pipes are inserted into the inner cavity of the turbine blade and are connected to the air film holes thereon. The pressurized mixed abrasive enters the inner cavity of the turbine blade through the two side pipes.

5. A gas-driven abrasive polishing device for turbine blade inner cavity and air film hole according to claim 4, characterized in that: The abrasive mixing assembly includes a storage tank and a circulation pipe connected to the storage tank. The circulation pipe is externally connected to a booster air pump through an air inlet pipe. A plurality of dispersion funnels are arranged on the circulation pipe. The circulation pipe is connected to the storage tank through an air outlet pipe. The inner cavity of the storage tank is volute-shaped and is arranged with corresponding channels. An output pipe is arranged in the outlet direction of the channel. The output pipe is connected to the diversion pipe through a buffer pipe. The mixed abrasive travels in the channel along the airflow direction and is mixed before being blown out from the output pipe.

6. A gas-driven abrasive polishing device for turbine blade inner cavity and air film holes according to claim 5, characterized in that: The circulating pipe is fixedly arranged on the upper end surface of the storage tank through a mounting bracket. The storage tank is provided with a pressure gauge for detecting the internal air pressure value of the storage tank. The buffer pipe is arranged with a rotary switch.

7. A gas-driven abrasive polishing device for turbine blade inner cavity and air film holes according to claim 6, characterized in that: The upper part of the clamping plate is provided with semicircular openings matching the through pipes on both sides, and the through pipes on both sides passing through the semicircular openings are clamped and fixed on the clamping plate by fastening clamps and screws.

8. A gas-driven abrasive polishing method for turbine blade inner cavity and air film holes, characterized in that: The turbine blade is polished by the gas-driven abrasive polishing device for the inner cavity and air film hole of the turbine blade as described in any one of claims 1 to 7, specifically The following steps are involved: S1: Open the box cover, place the turbine blade in a proper position inside the box, move the clamping plates on both sides through the threaded rod, and clamp the front and rear ends of the turbine blade; S2: Adjust the first clamping assembly to make it horizontal, move the V-shaped clamp block through the threaded screw, clamp the left and right ends of the turbine blade, and connect and fix them through the fastening nut and spring washer; S3: insert the through pipes on both sides into the turbine blades, extend them into the inner cavity of the turbine blades for a certain length, and fix them with fastening clips; S4: Return the upper cover of the box to its original position to form a sealed cavity inside the box; S5: The through pipes on both sides are connected to the buffer pipe through the diverter and connected to the output pipe of the storage tank; S6: Let the gas enter the circulation tube through the air inlet pipe at the upper end of the circulation tube at a certain angle, close the rotary switch of the buffer tube to form a closed chamber, and turn on the pressure gauge; S7: Add the pre-treated dry abrasive into the dispersion funnel, and flow along the air flow direction, enter the storage tank through the air outlet pipe at the lower end of the circulation pipe, and form a gas-abrasive mixing chamber; S8: When the actual number on the pressure gauge reaches the allowable value, turn on the rotary switch on the buffer pipe. The mixed gas particles follow the direction of the air flow through the two side pipes at both ends of the diversion pipe and enter from both sides of the turbine blade and pass through the air film hole.

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