Electrode punching device applied to gas turbine blade

Abstract

The embodiment of the invention discloses an electrode punching device applied to a gas turbine blade. According to one specific embodiment, the device comprises an electrode base, an electrode main body, a pressing block and an electrode wire, the electrode base is connected with an external machine tool spindle; the electrode main body comprises a first end part and a second end part which are perpendicular to each other, and the first end part is connected with the electrode base; the second end part is provided with an electrode wire groove array, a fixing hole and a guide groove, the electrode wire groove array is positioned on the end surface of the second end part, an electrode wire can be embedded into each electrode wire groove in the electrode wire groove array, and the electrode wire groove array is arranged opposite to the guide groove; the pressing block is provided with a pressurizing surface, a fixing surface and a guiding surface, the pressurizing surface and the guiding surface are both perpendicular to the fixing surface, and the pressurizing surface and the guiding surface are oppositely arranged; the pressurizing surface corresponds to the electrode wire groove array, the guide surface is configured to move along the guide groove, the fixing surface is provided with a threaded hole, and the pressing block and the electrode main body are connected through the fixing hole and the threaded hole. According to the embodiment, the punching efficiency can be improved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of machining technology, and more specifically to an electrode drilling device applied to gas turbine blades. Background Technology

[0002] The drilling process in gas turbine blades is a crucial step, as its precision and quality directly affect the blade's performance and lifespan. Traditional drilling methods typically involve sequentially machining individual electrode wires.

[0003] However, in practice, it has been found that when drilling using the above method, sequential processing with a single electrode wire often results in low drilling efficiency.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background of the inventive concept, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The summary portion of this disclosure is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description portion. This summary portion is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] Some embodiments of this disclosure provide an electrode drilling device for gas turbine blades to solve one or more of the technical problems mentioned in the background section above.

[0007] Some embodiments of this disclosure provide an electrode drilling device for gas turbine blades. The device includes: an electrode base, an electrode body, a clamping block, and an electrode wire. The electrode base is connected to an external machine tool spindle. The electrode body includes a first end and a second end that are perpendicular to each other. The first end is connected to the electrode base. The second end is provided with an electrode wire groove array, a fixing hole, and a guide groove. The electrode wire groove array is located on the end face of the second end. Each electrode wire groove in the electrode wire groove array can embed one electrode wire. The electrode wire groove array is arranged opposite to the guide groove. The clamping block is provided with a pressure surface, a fixing surface, and a guide surface. The pressure surface and the guide surface are both perpendicular to the fixing surface and are arranged opposite to each other. The pressure surface corresponds to the electrode wire groove array. The guide surface is configured to move along the guide groove. The fixing surface is provided with a threaded hole. The clamping block and the electrode body are connected through the fixing hole and the threaded hole. One end of the electrode wire is fixed in the electrode wire groove array through the pressure surface.

[0008] Optionally, the electrode base, the electrode body, and the clamping block are all integrally machined from 7075 aluminum alloy.

[0009] Optionally, the electrode wire is a high-temperature resistant electrode wire made of tungsten-copper composite material, wherein the copper content is 20%~30%.

[0010] Alternatively, the electrode wire described above is prepared by melt infiltration.

[0011] Optionally, the guide surface of the clamping block and the guide groove of the electrode body are both provided with a wear-resistant coating.

[0012] Optionally, the inner surface of each electrode wire groove in the above-mentioned electrode wire groove array is provided with an enhanced texture.

[0013] Optionally, the pressing surface of the above-mentioned clamping block is provided with an arc-shaped groove array corresponding to the above-mentioned electrode wire groove array.

[0014] Optionally, the lower surface of the electrode base is provided with a positioning groove and a mounting hole; the end face of the first end is provided with a positioning pin and a positioning hole, the positioning groove corresponds to the positioning pin, and the mounting hole corresponds to the positioning hole; a reinforcing structure is provided at the connection between the first end and the second end, wherein the reinforcing structure includes a reinforcing rib and a weight-reducing hole, the weight-reducing hole being provided on the reinforcing rib; the guide groove is provided with an inclined channel, and the guide surface is provided with an inclined surface matching the inclined channel.

[0015] The above embodiments of this disclosure have the following beneficial effects: the electrode drilling device applied to gas turbine blades according to some embodiments of this disclosure can improve the drilling efficiency of gas turbine blades. Specifically, the reason for the low drilling efficiency of gas turbine blades is that sequential processing using a single electrode wire results in low drilling efficiency. Based on this, some embodiments of this disclosure provide an electrode drilling device for gas turbine blades. The device includes: an electrode base, an electrode body, a clamping block, and an electrode wire; the electrode base is connected to an external machine tool spindle; the electrode body includes a first end and a second end that are perpendicular to each other, the first end being connected to the electrode base; the second end is provided with an electrode wire groove array, a fixing hole, and a guide groove, the electrode wire groove array being located on the end face of the second end, each electrode wire groove in the electrode wire groove array being able to embed one electrode wire, the electrode wire groove array being disposed opposite to the guide groove; the clamping block is provided with a pressure surface, a fixing surface, and a guide surface, the pressure surface and the guide surface being perpendicular to the fixing surface and disposed opposite to each other; the pressure surface is corresponding to the electrode wire groove array, the guide surface is configured to be movable along the guide groove, the fixing surface is provided with a threaded hole, the clamping block and the electrode body are connected through the fixing hole and the threaded hole; one end of the electrode wire is fixed in the electrode wire groove array through the pressure surface. By setting an electrode wire groove array at the second end of the electrode body, multiple electrode wires can participate in the drilling operation simultaneously, which improves drilling efficiency compared to the traditional method of processing a single electrode wire sequentially. At the same time, the arc-shaped groove array design on the clamping block, corresponding to the electrode wire groove array, ensures that each electrode wire can be firmly fixed, avoiding loosening during processing and further improving drilling accuracy and stability. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic structural diagram of an electrode drilling apparatus according to some embodiments of the present disclosure from one perspective; Figure 2 This is a structural schematic diagram of the electrode drilling device according to some embodiments of the present disclosure from another perspective. Detailed Implementation

[0018] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0019] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0020] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0023] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the electrode drilling apparatus according to some embodiments of the present disclosure from one perspective. Figure 1 It includes an electrode base 1, an electrode body 2, a clamping block 3, an electrode wire 4, a first end 201, a second end 202, and a fixing hole 203.

[0025] Figure 2 This is a structural schematic diagram of the electrode drilling device according to some embodiments of the present disclosure from another perspective. Figure 2 Includes guide groove 204.

[0026] In some embodiments, the electrode drilling device for gas turbine blades described above includes: an electrode base 1, an electrode body 2, a clamping block 3, and an electrode wire 4. The electrode base 1 can be a cylindrical structure, and its top can be provided with a connection interface that matches the spindle end of an external machine tool, allowing the electrode base 1 to be connected to the spindle of the external machine tool. For example, the electrode base can be a flange, and the external machine tool can be a robotic arm. The top of the flange has bolt holes or locating pin holes that match the spindle end of the robotic arm, allowing the flange to be fixed to the robotic arm with screws.

[0027] In some embodiments, the electrode body 2 may include a first end 201 and a second end 202 that are perpendicular to each other, forming an "L"-shaped structure. Both the first end 201 and the second end 202 can be cylindrical structures. The first end 201 can be the vertical portion of the "L"-shaped structure, and its top surface can be tightly fitted to the bottom surface of the electrode base 1, and can be fixedly connected to the electrode base 1 by welding or bolting. The second end 202 can be the horizontal portion of the "L"-shaped structure, and may be provided with an electrode wire groove array, fixing holes 203, and guide grooves 204. The electrode wire groove array can be grooves distributed at fixed intervals, for example, one electrode wire groove is provided every 3 mm. The electrode wire grooves can have a "V"-shaped structure to facilitate the embedding and fixing of the electrode wire 4. The electrode wire 4 can be a rod-shaped electrode wire obtained by drawing a tungsten copper rod, possessing a certain strength and capable of withstanding the high-temperature environment during the drilling process. The diameter of the electrode wire 4 can be selected according to actual processing requirements, for example, a diameter of 0.5 mm or 1 mm. The electrode wire groove array can be vertically distributed on the end face of the second end 202, and each electrode wire groove in the electrode wire groove array can embed one electrode wire 4. It should be noted that in order to set more electrode wire grooves, the width of the second end 202 can be extended so that the width of the second end 202 is equivalent to the width of the gas turbine blade, so that a row of holes can be drilled for the gas turbine blade at the same time, further improving the drilling efficiency. The fixing hole 203 can be a vertical through hole penetrating the second end 202. The guide groove 204 can be a vertical groove. The electrode wire groove array can be arranged opposite to the guide groove 204. The clamping block 3 can be a "C" shaped structure, and the opening of the clamping block 3 can face the second end 202 of the electrode body 2.

[0028] In some embodiments, the clamping block 3 may have a pressure surface, a fixing surface, and a guide surface, all of which may be inner surfaces of the clamping block 3. The pressure surface and the guide surface are perpendicular to the fixing surface and may be arranged opposite to each other. The pressure surface may correspond to the electrode wire groove array and is used to apply pressure to the electrode wire 4 embedded in the electrode wire groove array, thereby fixing the electrode wire 4. The guide surface is configured to move along the guide groove 204. The fixing surface may contact the bottom surface of the second end 202 and may have a threaded hole. The position of the threaded hole may correspond to the position of the fixing hole 203. The clamping block 3 and the electrode body 2 can be connected by screws passing through the fixing hole 203 and the threaded hole. One end of the electrode wire 4 can be fixed in the electrode wire groove array via the pressure surface. The electrode drilling device described above drills holes in gas turbine blades by drilling upwards, that is, the electrode wire 4 is located below the gas turbine blade. The electrode drilling device is moved upwards to drill holes in the gas turbine blade. This drilling method can reduce the risk of debris accumulating in the hole during the drilling process, thereby improving the drilling quality and accuracy. Specifically, one end of each of the multiple electrode wires 4 can be placed into the respective electrode wire slots in the electrode wire slot array and initially bonded and fixed with electrical tape. Then, the pressure surface of the clamping block 3 is pressed against each electrode wire 4 and the fixing surface is in contact with the bottom surface of the second end 202. At this time, the guide surface is embedded in the guide groove 204. Then, the clamping block 3 is initially fixed to the electrode body 2 with screws, so that the electrode wires 4 can still move in the electrode wire slots. Next, the discharge position and the processing position of the gas turbine blade are modeled so that the top of each electrode wire 4 in the electrode wire slot array is in contact with the surface of the gas turbine blade. Finally, the screws are tightened to fix the electrode wires 4 in the electrode wire slots, and each electrode wire 4 is picked up with tweezers to ensure that each electrode wire 4 is not loose. It should be noted that the electrode wires 4 may be bent due to impact or other reasons. Before use, a straightener should be used to check whether the electrode wires 4 are bent. If bent, they can be straightened by flat rolling. The aforementioned shaping device can be a mold with straight grooves. By placing the electrode wire 4 into the straight grooves and rolling it, it can be observed whether the electrode wire 4 is bent.

[0029] Optionally, the electrode base 1, the electrode body 2, and the clamping block 3 can all be integrally machined from 7075 aluminum alloy. 7075 aluminum alloy possesses high strength, excellent hot working properties, and corrosion resistance. Its tensile strength can reach over 524 MPa, and its yield strength reaches 455 MPa, enabling it to withstand the significant stress generated during drilling without permanent deformation. Furthermore, 7075 aluminum alloy has a density of only 2.81 g / cm³, which reduces the overall weight of the device compared to traditional steel, thus helping to reduce the load and energy consumption of the external machine tool spindle.

[0030] Optionally, the electrode wire 4 can be a high-temperature resistant electrode wire made of tungsten-copper composite material, wherein the copper content is 20%~30%. Tungsten-copper composite material combines the high melting point and high hardness of tungsten with the high electrical and thermal conductivity of copper, enabling the electrode wire 4 to maintain stable performance in high-temperature drilling environments and preventing deformation and breakage. Simultaneously, the 20%~30% copper content ensures the conductivity of the electrode wire 4 while controlling costs. Furthermore, this high-temperature resistant electrode wire has a relatively long service life, reducing the cost and time consumption associated with frequent replacements of the electrode wire 4 and improving overall drilling efficiency.

[0031] Optionally, the electrode wire 4 can be prepared by melt infiltration. Specifically, firstly, a certain mass ratio of tungsten powder and copper ingot can be prepared. Then, the tungsten powder can be initially mixed with a small amount of temporary binder (such as paraffin wax) to ensure good powder flowability and obtain a uniformly mixed powder. Then, the mixed powder is pressed into a predetermined shape under high pressure, which can be a rod shape, to obtain a tungsten skeleton with pores. Next, the tungsten skeleton can be sintered at high temperature in a hydrogen or vacuum environment to improve its strength and obtain a stable pore structure. Then, a copper ingot can be placed on top of the tungsten skeleton and the temperature can be set above the melting point of copper but far below the melting point of tungsten, so that the molten copper can penetrate into the pores of the tungsten skeleton under the action of gravity or capillary force to obtain a tungsten-copper composite material. Next, the tungsten-copper composite material is hot-processed by plastic deformation at high temperature to further close the residual pores, increase the density, and obtain a tungsten-copper alloy rod with a denser and more uniform structure. Then, the electrode wire of the required diameter can be obtained by drawing. Next, the drawn electrode wire may have micro-scratches, oxide layers, or slight dimensional deviations. These can be refined through processes such as ultrasonic cleaning and electropolishing to obtain electrode wires with precise dimensions and smooth surfaces. Finally, the refined electrode wires undergo quality inspection, and those that pass the inspection can be used as electrode wires for drilling holes in gas turbine blades.

[0032] Optionally, both the guide surface of the clamping block 3 and the guide groove 204 of the electrode body 2 are provided with a wear-resistant coating. The wear-resistant coating can be a tungsten carbide coating or a titanium nitride coating, etc. These coatings have extremely high hardness and wear resistance, which can effectively reduce the wear of the guide surface and the guide groove 204 during relative movement and extend the service life of the electrode drilling device.

[0033] Optionally, the inner surface of each electrode wire groove in the aforementioned electrode wire groove array is provided with a reinforcing texture. This reinforcing texture can be a fine stripe or a mesh structure, which can increase the friction between the electrode wire 4 and the electrode wire groove array. Specifically, when the electrode wire 4 is embedded in the electrode wire groove array, the clamping block 3 can increase the friction between itself and the electrode wire 4 through the reinforcing texture, reducing the loosening of the electrode wire 4 due to vibration or force during the drilling process.

[0034] Optionally, the pressing surface of the pressing block 3 may be provided with an arc-shaped groove array corresponding to the electrode wire groove array. The shape of each arc-shaped groove in the arc-shaped groove array may match the shape of the electrode wire 4. The pressing block 3 can provide uniform and stable pressure to the electrode wire 4 through the arc-shaped groove array.

[0035] Optionally, the lower surface of the electrode base 1 may be provided with a positioning groove and a mounting hole. The end face of the first end 201 may be provided with a positioning pin and a positioning hole. The positioning groove may be a cylindrical groove, and the positioning pin may be a columnar structure adapted to the positioning pin, which can provide guidance for the installation of the electrode base 1 and the electrode body 2. The mounting hole may be a through hole with internal threads. The positioning hole may be a through hole with the same size as the mounting hole, and the mounting hole may correspond to the positioning hole. A screw can be passed through the positioning hole and engaged with the mounting hole to fix the electrode base 1 and the electrode body 2. A reinforcing structure may be provided at the connection between the first end 201 and the second end 202. The reinforcing structure may include reinforcing ribs and weight-reducing holes. The reinforcing ribs can enhance the rigidity of the connection between the first end 201 and the second end 202 and reduce the possibility of deformation or breakage of the electrode body 2 due to excessive force during drilling. The aforementioned weight-reducing holes can be through holes provided on the aforementioned reinforcing ribs, which can increase the structural strength of the aforementioned electrode body 2 while also reducing the overall weight. The aforementioned guide groove 204 can be provided with an inclined channel, which can be a channel with a certain angle in the vertical direction. The aforementioned guide surface can be provided with an inclined surface that matches the aforementioned inclined channel, so that the aforementioned clamping block 3 can move in the vertical direction along the guide groove 204 by screws, and can also move in the horizontal direction along the inclined channel, which can increase the pressure applied by the aforementioned pressure surface to the electrode wire 4 and improve the stability of the electrode wire 4 fixation.

[0036] In addressing the aforementioned technical problems through the adoption of technical solutions, the specific scenario for which this technical solution is applied—drilling holes in the leading edge region of gas turbine blades—often presents the following technical challenges: When drilling holes in the leading edge region of gas turbine blades, which has a significant thickness, deep vertical holes are required. Due to the greater hole depth, the lateral force on the electrode wire increases significantly during drilling. Furthermore, the electrode wire vibrates during drilling, increasing the risk of bending and consequently reducing drilling accuracy and hole quality. To address the following requirements for this application scenario: adaptability to deep holes, adaptability to vibration environments, and reduced risk of electrode wire bending, we have decided to adopt the following solution: Optionally, each electrode wire groove in the aforementioned electrode wire groove array can be vertically arranged, allowing the electrode wire 4 to be uniformly stressed in the vertical direction, ensuring the stability of the electrode wire 4 during upward drilling. The groove walls of the aforementioned electrode wire groove array can be embedded with high-hardness wear-resistant ceramic bushings, which can reduce wear on the electrode wire grooves caused by vibration of the electrode wire 4 during drilling, thereby improving the stability of the electrode wire 4 in the vertical direction. For example, the high-hardness wear-resistant ceramic bushing can be alumina ceramic, which has extremely high hardness and wear resistance, effectively resisting the vibration generated by the electrode wire 4 during drilling. Simultaneously, the high-hardness wear-resistant ceramic bushing also has good high-temperature resistance, maintaining stable performance in high-temperature drilling environments, and will not soften or deform due to temperature increases, further improving the fixing effect and drilling accuracy of the electrode wire 4. The bottom of the aforementioned electrode wire groove array can be provided with a positioning support platform, which can be a boss located at the bottom of the electrode wire groove array. The positioning support platform can have a bearing surface that matches the shape of the end of the electrode wire 4. The aforementioned pressure-bearing surface can be a plane with the same shape as the end of the electrode wire 4, which can be used to support the electrode wire 4 and provide stable support. Each electrode wire groove in the electrode wire groove array can have an extended guide groove at its top. This extended guide groove can be a columnar groove extending from the end face of the second end 202. The shape of the groove can be adapted to the shape of the electrode wire 4. The extended guide groove can be smoothly connected to the electrode wire groove, providing axial support for the electrode wire 4 and reducing the risk of bending due to axial pressure. The surface of the extended guide groove can have an anti-slip texture, which can be dotted or striped grooves. This anti-slip texture increases the friction between the electrode wire 4 and the extended guide groove, preventing axial slippage of the electrode wire 4 during drilling and improving drilling accuracy. The back of the extended guide groove can have reinforcing ribs connected to the second end 202, enhancing the structural strength of the extended guide groove and preventing deformation due to stress during drilling. The aforementioned pressure surface may be equipped with a replaceable rigid pad and an auxiliary guide groove corresponding to the aforementioned extended guide groove. The auxiliary guide groove may be a recess adapted to the aforementioned extended guide groove. The auxiliary guide groove may be adapted to the shape of the aforementioned electrode wire 4, and may cooperate with the aforementioned extended guide groove to enclose a portion of the electrode wire 4, further ensuring the stability of the electrode wire 4 during the drilling process. It can also accommodate the need to drill deeper vertical holes using a longer electrode wire 4. The aforementioned rigid pad may be made of a high-hardness, wear-resistant, and high-temperature-resistant material, such as tungsten carbide or boron nitride, which can reduce wear caused by direct friction between the electrode wire 4 and the pressure surface. Simultaneously, the rigid pad can withstand the high temperature and pressure generated during the drilling process, ensuring that the electrode wire 4 maintains stable performance during long-term, high-intensity drilling operations.The aforementioned rigid gasket can be fixed to the pressure surface with screws, facilitating replacement after wear and ensuring the flatness of the pressure surface and the fixation effect on the electrode wire 4. When the rigid gasket becomes worn, it can simply be removed from the pressure surface for replacement, without needing to replace the entire clamping block 3, thus reducing maintenance costs.

[0037] The above-described technical solution, as an inventive point of this disclosure, solves the technical problem of "when drilling holes in the leading edge region of a gas turbine blade, the leading edge region of the blade has a large thickness, requiring the drilling of deep vertical holes. Due to the greater hole depth, the lateral force on the electrode wire during drilling increases significantly, leading to a higher risk of electrode wire bending, thereby reducing drilling accuracy and hole quality." The factors leading to reduced drilling accuracy and hole quality are often as follows: when drilling holes in the leading edge region of a gas turbine blade, the leading edge region of the blade has a large thickness, requiring the drilling of deep vertical holes. Due to the greater hole depth, the lateral force on the electrode wire during drilling increases significantly, leading to a higher risk of electrode wire bending, thereby reducing drilling accuracy and hole quality. Solving these factors can improve drilling accuracy and hole quality. To achieve this effect, the electrode drilling device for gas turbine blades disclosed herein provides stable support by setting a positioning support platform at the bottom of the electrode wire groove array and using a pressure-bearing surface that matches the shape of the electrode wire end. At the same time, it forms a double anti-bending mechanism in conjunction with the axial limiting structure of the top extended guide groove and the auxiliary guide groove of the pressure surface. Meanwhile, the reinforcing ribs on the back of the extended guide groove can improve the overall rigidity of the structure, effectively resist the vibration and impact generated during the drilling process, and reduce the risk of electrode wire bending.

[0038] In addressing the aforementioned technical problems through the adoption of technical solutions, the application scenario of this technical solution—multi-hole synchronous discharge drilling of the leading edge region of gas turbine blades—often presents the following technical challenges: When performing multi-hole synchronous discharge drilling on the leading edge region of gas turbine blades, the blade's leading edge region is relatively thick, the drilling time is long, and the heat generated by the continuous discharge of the electrode wires is transferred to the clamping end of the electrode wires, causing thermal expansion at the clamping end. This affects the relative positional accuracy between the electrode wires, thereby reducing the drilling accuracy. Furthermore, traditional cooling methods typically use a single hose to guide coolant to a single processing point for cooling, which cannot simultaneously cool multiple electrode wires arranged side-by-side. Considering the following requirements for this application scenario: adaptability to long drilling times, adaptability to high-temperature environments, and adaptability to simultaneous cooling of side-by-side electrode wires, we have decided to adopt the following solution: Optionally, the side of the second end 202 may be provided with a coolant chamber extending along its length. This coolant chamber can be a horizontal channel for coolant flow to reduce the heat generated by the electrode wire 4 during drilling. The coolant can be a liquid with good thermal conductivity and high chemical stability, such as deionized water or cooling oil. The coolant chamber can be located between the fixing hole 203 and the electrode wire groove array, allowing the coolant flowing inside to absorb and remove heat. The inner wall surface of the coolant chamber can be provided with a flow-blocking structure to increase the flow path and turbulence of the coolant, thereby improving cooling efficiency. The flow-blocking structure can be a threaded structure or staggered protrusions or grooves, which can disrupt the laminar flow of the coolant, creating turbulence and enhancing heat exchange. The coolant chamber can have an inlet and an outlet at each end, both of which can be threaded holes that can mate with the threads of a pagoda connector, facilitating connection to an external coolant circulation system via pipes. The aforementioned external coolant circulation system can be a device for circulating coolant. For example, the external coolant circulation system may include components such as a coolant storage tank, a water pump, and pipes. The water pump draws coolant from the storage tank and delivers it to the inlet through the pipes. After flowing in the coolant chamber and absorbing heat, the coolant flows out from the outlet and returns to the storage tank through the pipes for cooling, repeating the cycle continuously to remove the heat generated by the electrode wire 4 during the drilling process. Both the outlet and the inlet can be equipped with a filter screen. The filter screen can be a circular, fine mesh structure with a diameter consistent with the diameter of the outlet and inlet. Rubber sealing rings can be bonded to the edges of the filter screen, which can be fixed inside the outlet and inlet by the rubber sealing rings to intercept impurities (such as debris) that may be present in the coolant, reducing the risk of impurities entering the external coolant circulation system and causing blockages or damage to other components, thus ensuring the normal operation of the coolant circulation system. The upper surface of the second end 202 may be provided with an array of inclined holes. This array of inclined holes may be through holes corresponding one-to-one with the electrode wire groove array. The array of inclined holes may be inclined towards the electrode wire groove array, and each inclined hole communicates with the coolant chamber. This allows the coolant flowing through the coolant chamber to be guided to the ends of each electrode wire 4 installed in the electrode wire groove array, enabling simultaneous cooling of each electrode wire 4 and improving cooling efficiency. Furthermore, the inclination angle of the inclined hole array can be adjusted according to actual needs to ensure that the coolant can cover each electrode wire 4.

[0039] The above-mentioned technical solution, as an inventive point of the embodiments of this disclosure, solves the technical problem of: "When performing multi-hole synchronous discharge drilling on the leading edge region of a gas turbine blade, the leading edge region of the blade is thick and the drilling time is long. The heat generated by the continuous discharge of the electrode wire will be transferred to the clamping end of the electrode wire, causing thermal expansion at the clamping end, affecting the relative positional accuracy between the electrode wires, thereby reducing the drilling accuracy. In addition, the traditional cooling method usually uses a single hose to guide the coolant to a single processing point for cooling, which cannot cool multiple electrode wires arranged side by side at the same time." Factors leading to reduced drilling accuracy and the inability to simultaneously cool multiple electrode wires arranged side-by-side are often as follows: When performing multi-hole synchronous discharge drilling on the leading edge region of a gas turbine blade, the leading edge region is thick, the drilling time is long, and the heat generated by the continuous discharge of the electrode wires is transferred to the clamping end of the electrode wires, causing thermal expansion at the clamping end. This affects the relative positional accuracy between the electrode wires, thus reducing drilling accuracy. In addition, traditional cooling methods typically use a single hose to guide coolant to a single machining point for cooling, making it impossible to simultaneously cool multiple electrode wires arranged side-by-side. If these factors are addressed, the drilling accuracy and the ability to simultaneously cool multiple electrode wires arranged side-by-side can be improved. To achieve this effect, the electrode drilling device for gas turbine blades disclosed herein provides a through-hole coolant chamber on the side of the second end 202, which, together with the inner wall flow-blocking structure, enhances heat exchange. At the same time, the inclined hole array precisely guides the coolant to the ends of each electrode wire, cooling a row of electrode wires simultaneously. Meanwhile, the coolant in the coolant chamber continuously removes heat, preventing thermal expansion at the clamping end, thereby ensuring the relative positional accuracy between the electrode wires and improving the drilling accuracy.

[0040] In addressing the aforementioned technical problems through the adoption of technical solutions, the application scenario of this technical solution—replacing partially damaged electrode wires—often presents the following technical challenges: Replacing partially damaged electrode wires requires completely removing the clamping block and then replacing the damaged wires with intact ones. During this process, the positions of the undamaged electrode wires are disturbed, necessitating repositioning of all electrode wires during installation, resulting in low replacement efficiency. Considering the following requirements for this application scenario: adaptability to partial electrode wire replacement, reduced disturbance to the positions of undamaged electrode wires, and improved replacement efficiency, we have decided to adopt the following solution: Optionally, the clamping block 3 may also be provided with a clamping column array. Each clamping column in the clamping column array can be a square column structure. The clamping column array can be arranged one-to-one with the electrode wire groove array, and each clamping column can individually clamp and fix an electrode wire 4. The side of the clamping column array opposite to the electrode wire groove array forms the pressure surface, which is used to apply pressure to the electrode wire 4 to fix the electrode wire 4. The fixing surface may be provided with a mounting groove adapted to the bottom shape of the clamping column. The mounting groove can be a square groove, which facilitates the insertion of the clamping column and provides a stable mounting base for the clamping column, preventing it from shaking or shifting during installation or operation. The number of mounting grooves can correspond to the number of clamping column arrays. The side of the clamping column may be provided with anti-slip texture. The anti-slip texture may include, but is not limited to, raised dots, grooves, and ripples. The anti-slip texture can increase the friction between the fingers or tools and the clamping column, preventing slippage during operation and improving operational safety. Each clamping column in the aforementioned clamping column array can have a threaded fixing hole at its bottom. Corresponding to the threaded fixing hole, a mounting fixing hole can be provided at the position of the mounting groove. This mounting fixing hole can be a vertical through hole, allowing a screw to pass through from below the fixing surface and engage with the threaded fixing hole, thus achieving a detachable connection between the clamping column and the fixing surface. When replacing a damaged electrode wire 4, simply remove the screw and clamping column from the corresponding position, then remove the damaged electrode wire 4 and replace it with a new one. Next, align the new electrode wire 4 with the remaining electrode wires 4, and finally re-fix the clamping column with the screw. This completes the replacement of the electrode wire 4. During this process, the undamaged electrode wire 4 remains unaffected by the removal of the clamping column, and its position does not change, eliminating the need for repositioning and significantly improving replacement efficiency.

[0041] The above-described technical solution, as an inventive point of this disclosure, solves the technical problem of "when replacing partially damaged electrode wires, the entire clamping block needs to be removed before replacing the damaged electrode wires with intact electrode wires. During this process, the positions of the undamaged electrode wires may be disturbed, requiring repositioning of all electrode wires during installation, resulting in low replacement efficiency." The factors leading to low electrode wire replacement efficiency are often as follows: when replacing partially damaged electrode wires, the entire clamping block needs to be removed before replacing the damaged electrode wires with intact electrode wires. During this process, the positions of the undamaged electrode wires may be disturbed, requiring repositioning of all electrode wires during installation, resulting in low replacement efficiency. Solving these factors can improve the efficiency of electrode wire replacement. To achieve this effect, the electrode drilling device for gas turbine blades disclosed in this disclosure sets an array of clamping columns on the clamping block, allowing each clamping column to individually clamp and fix one electrode wire. When replacing a damaged electrode wire, only the clamping post corresponding to the damaged electrode wire needs to be disassembled and replaced. There is no need to disassemble the entire clamping block, thus avoiding positional disturbance of the undamaged electrode wires and eliminating the need to reposition all electrode wires, significantly improving replacement efficiency.

[0042] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An electrode drilling device for use in gas turbine blades, characterized in that, The electrode drilling device includes: an electrode base, an electrode body, a clamping block, and an electrode wire; The electrode base is connected to an external machine tool spindle; The electrode body includes a first end and a second end that are perpendicular to each other, and the first end is connected to the electrode base; The second end is provided with an electrode wire groove array, a fixing hole and a guide groove. The electrode wire groove array is located on the end face of the second end. Each electrode wire groove in the electrode wire groove array can embed one electrode wire. The electrode wire groove array is arranged opposite to the guide groove. The clamping block has a pressure surface, a fixing surface, and a guide surface. The pressure surface and the guide surface are both perpendicular to the fixing surface and are arranged opposite to each other. The pressure surface corresponds to the electrode wire groove array, the guide surface is configured to move along the guide groove, the fixing surface is provided with a threaded hole, and the clamping block and the electrode body are connected through the fixing hole and the threaded hole; One end of the electrode wire is fixed in the electrode wire groove array through the pressure surface.

2. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, The electrode base, the electrode body, and the clamping block are all integrally machined from 7075 aluminum alloy.

3. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, The electrode wire is a high-temperature resistant electrode wire made of tungsten-copper composite material, wherein the copper content is 20%~30%.

4. The electrode drilling device for gas turbine blades according to claim 3, characterized in that, The electrode wire is prepared by melt infiltration.

5. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, Both the guide surface of the clamping block and the guide groove of the electrode body are provided with wear-resistant coatings.

6. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, The inner surface of each electrode wire groove in the electrode wire groove array is provided with an enhanced texture.

7. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, The pressing surface of the clamping block is provided with an arc-shaped groove array corresponding to the electrode wire groove array.

8. The electrode drilling device for gas turbine blades according to claim 1, characterized in that, The lower surface of the electrode base is provided with a positioning groove and a mounting hole; The end face of the first end is provided with a positioning pin and a positioning hole, the positioning groove corresponds to the positioning pin, and the mounting hole corresponds to the positioning hole; A reinforcing structure is provided at the connection between the first end and the second end, wherein the reinforcing structure includes a reinforcing rib and a weight-reducing hole, and the weight-reducing hole is provided on the reinforcing rib; The guide groove is provided with an inclined channel, and the guide surface is provided with an inclined surface that matches the inclined channel.

Images