Turbine blade electroplating tool hanger

Abstract

The utility model discloses a turbine blade electroplating tool hanger, and belongs to the technical field of electroplating. The hanging tool comprises a supporting rod on the upper section, an auxiliary electrode on the lower section and a workpiece clamping piece, and a lifting hook is arranged at the top of the supporting rod and used for being connected with a cathode bar of an electroplating bath to serve as a conductive bridge; part of metal ions are deposited on the auxiliary electrode in the electroplating process of the auxiliary electrode, so that the deposition amount on the working electrode (cathode workpiece) is reduced, and the local coating of the blade is prevented from being too thick; and the workpiece clamping piece is clamped on the blade tenon, so that the whole blade is fixed. The hanger can effectively prevent and solve the problem of non-uniformity of the thickness of the platinum plating layer.

Description

Technical Field

[0001] This utility model relates to the field of electroplating technology, specifically to a turbine blade electroplating fixture. Background Technology

[0002] In platinum-modified aluminide coatings, the introduction of Pt significantly improves the anti-scraping and self-healing capabilities of the Al2O3 film on the coating surface, thereby enhancing the coating's structural stability and effectively reducing interdiffusion between the coating and the substrate (ensuring a higher Al concentration within the coating for a longer period and inhibiting the diffusion of refractory elements such as W and Mo from high-temperature alloys to the coating side), thus slowing down the coating degradation rate. The coating typically has a bilayer structure: an outer layer of PtAl2 and NiAl or a Pt-rich (Pt,Ni)Al single-phase layer, and an inner layer of NiAl single-phase layer. Due to its excellent resistance to high-temperature oxidation and hot corrosion, platinum-aluminum coatings have a significantly longer service life than traditional aluminide coatings.

[0003] PtAl2 is an intermetallic compound, and dislocation movement is hindered, making it prone to crack initiation and propagation, especially during thermal cycling. During high-temperature service, Al continuously oxidizes to the surface and diffuses into the matrix, leading to a gradual depletion of the Al in the PtAl2 phase. Ultimately, the Al2O3 layer cannot be maintained, resulting in a sharp drop in oxidation resistance. In sulfur-, vanadium-, or salt spray environments, the PtAl2 phase may cause the Al2O3 film to rupture due to localized molten salt erosion; therefore, the formation of the PtAl2 phase should be minimized.

[0004] Platinum-modified aluminum compound coatings are typically deposited onto turbine blade substrates via electroplating, a process often employing electroplating racks. These racks primarily function to conduct electricity, support, and fix the parts in the electroplating process. The racks are connected to the electrodes, ensuring a more uniform current distribution across the parts for electroplating. Before electroplating deposition, suitable plating racks are required to meet the deposition requirements and minimize the formation of the PtAl2 phase.

[0005] Furthermore, electroplating, as an indispensable coating technology in the manufacturing industry, plays a crucial role in product surface protection and functional enhancement. During the electroplating process, various adverse conditions inevitably occur. The high incidence of these anomalies not only severely disrupts the production process and reduces product quality pass rates but can also lead to significant economic losses. Given that aero-engine turbine blades typically exhibit complex and non-uniform geometries, it is not only difficult to maintain a smooth blade surface but also creates specific stress concentration areas within the blade. Although various strategies are usually implemented during the design process to prevent such situations, excessive stress is still considered one of the important causes of turbine blade fracture. Developing suitable electroplating fixtures is also extremely important for optimizing the problem of coating non-uniformity. Utility Model Content

[0006] The purpose of this utility model is to provide a turbine blade electroplating fixture that can effectively prevent and solve the problem of non-uniformity in platinum coating thickness.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A fixture for electroplating the outer surface of a turbine blade, comprising an upper support rod and a lower auxiliary electrode and workpiece clamping component, wherein:

[0009] Support rod: It is equipped with a hook at the top for connecting to the cathode rod of the electroplating tank, serving as a conductive bridge;

[0010] Auxiliary electrode: During the electroplating process, some metal ions are deposited on the auxiliary electrode, thereby reducing the amount of deposited on the working electrode (cathode workpiece) to prevent the local plating layer from being too thick.

[0011] Workpiece clamping component: clamped on the blade tenon to fix the entire blade.

[0012] Furthermore, the workpiece clamping component is made of copper wire, with one end connected to the lower end of the support rod and the other end bent into a U-shaped structure I; the plane of the U-shaped structure I in the workpiece clamping component is perpendicular to the support rod; the two parallel segments of the U-shaped structure I are respectively engaged with the tenons on both sides of the blade tenon.

[0013] Furthermore, the auxiliary electrode includes electrode I and electrode II, both of which are made of copper wire.

[0014] Furthermore, one end of electrode I is connected to the lower end of the support rod, and the other end of electrode I is bent into a U-shaped structure II. The U-shaped structure II is located below the U-shaped structure I, and the air inlet and air outlet sides on the blades fixed to the workpiece clamp are located between the two parallel segments of the U-shaped structure II and are not in contact with the U-shaped structure II.

[0015] Furthermore, electrode II is located below the support rod, and the upper end of electrode II is connected to the lower end of the support rod. The lower end of electrode II is bent into a hook-shaped structure. This hook-shaped structure is located on the back of the blade and does not contact the back of the blade.

[0016] Furthermore, the workpiece clamping component, electrode I, and electrode II are fixedly connected to the lower end of the support rod by means of bolt connection and / or welding.

[0017] Furthermore, the diameter of the copper wire is 1.5-3mm; the support rod and its top hook are an integral structure made of bent copper sheet, and the support rod is 6-12cm high, 1.5-2.0cm wide, and 2.0-3.5mm thick.

[0018] The advantages and beneficial effects of this utility model are as follows:

[0019] Traditional platinum plating processes often face challenges in achieving uniform thickness distribution for turbine blades with complex surface structures. This is likely due to the non-uniformity of the plating solution flow and current distribution, as well as the complexity of the blade geometry. This invention offers the following advantages through optimized fixture structure:

[0020] 1. The hook of the tooling fixture of this utility model is precisely placed at the cathode position of the electroplating tank. This arrangement not only ensures effective current conduction, but also plays a crucial role as a conductive bridge, thereby ensuring the smooth progress and uniform coverage of the electroplating process.

[0021] 2. The support rod in this utility model is the core support component of the hanger. Its main function is to bear the current load and static weight generated by the entire hanger and the suspended workpiece during operation, so as to ensure the stability and safety of the system.

[0022] 3. This utility model is designed with the specific structural features of the blade in mind. The blade clamping component, electrode I and electrode II are made of copper wire. Electrode I and electrode II are placed near the parts of the blade coating that are prone to thickening (the air inlet edge, the air outlet edge, and the back of the blade) to reduce the impact of the tip effect on its performance.

[0023] 4. The copper material used in this utility model tool hanger has excellent heat resistance, can withstand high temperature environments up to 200℃, and has good corrosion resistance, and can be used stably under harsh conditions with a pH value between 12 and 13.

[0024] 5. This utility model tooling can ensure the stability of the blades during the platinum coating deposition process, avoiding quality problems and reduced process efficiency caused by movement; on the other hand, it improves the uniformity of the platinum coating, significantly improves the quality and stability of the coating, and effectively reduces the scrap rate. Attached Figure Description

[0025] Figure 1 The turbine rotor blades of the aero-engine for which this utility model hanger is designed.

[0026] Figure 2 This is a structural diagram of the electroplating tooling fixture of this utility model;

[0027] Figure 3 This is a left view of the electroplating fixture of this utility model.

[0028] In the figure: 1-support rod; 2-hook; 3-workpiece clamping part; 4-electrode I; 5-electrode II; 6-tenon; 7-blade back; 8-leading edge; 9-tailing edge. Detailed Implementation

[0029] The present invention will be described in detail below with reference to the accompanying drawings.

[0030] This utility model discloses a tooling fixture for electroplating the outer surface of turbine blades, which is designed for aero-engine turbine rotor blades such as... Figure 1 As shown, stress concentration is likely to occur at several locations, including the blade body and tenon 6, the air intake edge 8 at the leading edge, the exhaust edge 9 at the trailing edge, and the blade back 7, which can lead to uneven coating.

[0031] The structure of the electroplating fixtures used is as follows: Figure 2-3 As shown. The fixture includes an upper support rod 1 and a lower auxiliary electrode and workpiece clamping component 3. The top of the support rod is equipped with a hook 2 for connecting to the cathode rod of the electroplating tank, serving as a conductive bridge. The support rod is made of copper.

[0032] The workpiece clamping component 3 is made of copper wire. The workpiece clamping component fixes the entire blade by clamping the blade tenon. Specifically, one end of the workpiece clamping component is connected to the lower end of the support rod 1, and the other end is bent into a U-shaped structure I. The plane of the U-shaped structure I in the workpiece clamping component is perpendicular to the support rod 1. The two parallel segments of the U-shaped structure I are respectively engaged with the tenons on both sides of the blade tenon.

[0033] The auxiliary electrode is made of copper wire and includes electrode I 4 and electrode II 5. The function of the auxiliary electrode is to deposit some metal ions on it during the electroplating process, thereby reducing the amount of deposition on the working electrode (cathode workpiece) and preventing excessive local plating thickness on the blade. Specifically, one end of electrode I is connected to the lower end of the support rod, and the other end of electrode I is bent into a U-shaped structure II. The U-shaped structure II is located below the U-shaped structure I, and the lower part of the blade fixed on the workpiece clamp is located between the two parallel segments of the U-shaped structure II and is not in contact with the U-shaped structure II.

[0034] Furthermore, electrode II is located below the support rod, and the upper end of electrode II is connected to the lower end of the support rod. The lower end of electrode II is bent into a hook-shaped structure. The hook-shaped structure is located on one side of the protruding position on the blade body and does not contact the protruding position.

[0035] Furthermore, the workpiece clamping component, electrode I, and electrode II are fixedly connected to the lower end of the support rod. The connection method can be bolt connection or welding, or both bolt connection and welding can be used simultaneously. For example, bolt holes are opened at the lower end of the support rod, the copper wire to be fixed end is first put into the bolt hole, then the bolt is tightened to fix it, and finally welding is performed to fix it.

[0036] The copper wire used in this invention to manufacture electrode I, electrode II, and workpiece clamping parts has a diameter of 1.5-3mm (e.g., 2mm); the support rod and its top hook are an integral structure made of bent copper sheet; the support rod has a height of 6-12cm, a width of 1.5-2.0cm, and a thickness of 2.0-3.5mm (e.g., a height of 8cm, a width of 1.7cm, and a thickness of 2.5mm).

[0037] The process of using the electroplating fixture described above is as follows:

[0038] Prepare an electroplating tank, inject the electroplating solution into the fixed electroplating tank, suspend the tooling fixture above the cathode of the electroplating tank, clamp the tenon of the blade to be plated on the workpiece holder, opposite the platinum sheet, and deposit the metal ions in the electrolyte onto the surface of the workpiece through DC electrolysis to complete the platinum electroplating process.

[0039] During the electroplating process, for this specific blade structure, placing the tip area of ​​the blade (blade back, leading edge air inlet edge, trailing edge air outlet edge) close to the copper auxiliary electrodes (electrode I, electrode II) can significantly reduce the tip effect of the blade and make the plating layer uniform.

[0040] This utility model includes, but is not limited to, the above embodiments. Any equivalent substitutions or partial improvements made under the overall innovative concept of this utility model shall be considered within the protection scope of this utility model.

Claims

1. A turbine blade electroplating fixture, characterized in that: The fixture includes an upper support rod and a lower auxiliary electrode and workpiece clamping components, wherein: Support rod: It is equipped with a hook at the top for connecting to the cathode rod of the electroplating tank, serving as a conductive bridge; Auxiliary electrode: During the electroplating process, some metal ions are deposited on the auxiliary electrode, thereby reducing the amount of deposited on the working electrode and preventing the local coating of the blade from being too thick; Workpiece clamping component: clamped on the blade tenon to fix the entire blade.

2. The turbine blade electroplating tooling hanger of claim 1, wherein: The workpiece clamping component is made of copper wire. One end of the workpiece clamping component is connected to the lower end of the support rod, and the other end is bent into a U-shaped structure I. The plane of the U-shaped structure I in the workpiece clamping component is perpendicular to the support rod. The two parallel segments of the U-shaped structure I are respectively engaged with the tenons on both sides of the blade tenon.

3. The turbine blade electroplating tooling hanger of claim 2, wherein: The auxiliary electrodes include electrode I and electrode II, both made of copper wire.

4. The turbine blade electroplating tooling hanger of claim 3, wherein: One end of electrode I is connected to the lower end of the support rod, and the other end of electrode I is bent into a U-shaped structure II. The U-shaped structure II is located below the U-shaped structure I, and the air inlet and air outlet edges on the blades fixed to the workpiece clamp are located between the two parallel segments of the U-shaped structure II and are not in contact with the U-shaped structure II.

5. The turbine blade electroplating tooling hanger of claim 3, wherein: The electrode II is located below the support rod, and the upper end of the electrode II is connected to the lower end of the support rod. The lower end of the electrode II is bent into a hook-shaped structure. The hook-shaped structure is located on the back of the blade and does not contact the back of the blade.

6. The turbine blade electroplating fixture according to claim 3, characterized in that: The workpiece clamping component, electrode I, and electrode II are fixedly connected to the lower end of the support rod by bolt connection and / or welding.

7. The turbine blade electroplating tooling hanger of claim 3, wherein: The diameter of the copper wire is 1.5-3mm; the support rod and its top hook are an integral structure made of bent copper sheet, and the support rod is 6-12cm high, 1.5-2.0cm wide and 2.0-3.5mm thick.

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