Device capable of realizing efficient coating of high-conductivity blade coating

Abstract

The device comprises a connecting rod, a high guide blade outer edge plate protection box, a part fixing nut and an inner edge plate symmetrical protection box, a high guide blade passes through the inner edge plate symmetrical connection protection box, and high guide blade inner edge plate U-shaped grooves are mutually embedded in the inner edge plate protection box. The device is simple in structure, has fewer accessories, is easy to process, disassemble and assemble a product, can perform matching design of the tool size according to the size of the high guide blade, and reduces the cost. By means of the device, the charging amount of the EB-PVD equipment during machining can be remarkably increased. And double-side cross uniform distribution installation is carried out, the blades are free of mutual shielding phenomenon in the axial direction and the radial direction, and the coating thickness uniformity and the coating quality are good.

Description

Technical Field

[0001] The invention belongs to the field of manufacturing engine turbine high guide vanes, and specifically relates to the technical field of depositing thermal barrier coatings on the surfaces of engine turbine high guide vanes by using electron beam physical vapor deposition technology. Background Art

[0002] At present, due to the advantages of electron beam physical vapor deposition (EB-PVD for short), such as high bonding strength between coating and substrate, columnar crystal structure, easy and precise control of coating chemical composition and long coating life, it has been widely used in the preparation and processing of high-temperature protective coatings for turbine blades of various types of engines. It has significantly improved the high-temperature oxidation resistance, corrosion resistance and thermal insulation performance of turbine blades, and extended the service life of the engine.

[0003] When depositing the coating, the EB-PVD technology uses an electron beam gun to heat the parts and an electron beam gun to evaporate the ingot. The blade is placed above the ingot, and the coating vapor is deposited on the blade surface to form a typical columnar crystal structure.

[0004] The structure of the equipment itself determines that the width of the electron beam that heats the blades should not be too large. If it is too large, the blades will receive less heat radiation and cannot meet the process requirements. The width of the electron beam can be adjusted in the range of 10-200mm, and the width of the electron beam cannot be further increased.

[0005] At present, when the turbine high guide vanes are coated in the EB-PVD equipment, due to the limitation of the electron beam scanning heating range, only one turbine high guide vane can be processed in a single furnace during coating. The coating processing efficiency is low and the processing cost is high, which seriously restricts the promotion and application of EB-PVD technology. Summary of the invention

[0006] The present invention designs a device and a method for efficiently coating high-guide blades by analyzing the size of high-guide blades and the size of tooling structure, and combining the working principle of EB-PVD equipment. The device can assemble two high-guide blades in a single furnace according to the size of the high-guide blades and the design coating area requirements. In order to shorten the lateral spacing when assembling the two high-guide blades, the fan-shaped structure and U-shaped groove structure characteristics of the inner edge plate of the high-guide blade are fully utilized, and the U-shaped grooves of the two high-guide blades are placed crosswise to further reduce the lateral spacing, thereby solving the technical problem of uniformity of blade surface coating thickness; at the same time, when the blade is heated by electron beam scanning heating, the lateral spacing is reduced, the energy distribution of the scanning spot is adjusted, and the technical problem of blade temperature uniformity control is solved. The solution of the above two technical problems realizes efficient coating of high-guide blade coating, increases the furnace loading capacity of high-guide blade coating processing by 2 times, greatly improves coating processing efficiency, and reduces coating processing costs.

[0007] The present invention is implemented by the following technical solutions:

[0008] It includes: connecting rod, high guide vane outer edge plate protection box, parts fixing nut, and inner edge plate symmetrical protection box. The high guide vane is connected through the inner edge plate symmetrical protection box. At the inner edge plate protection box, the U-shaped grooves of the inner edge plate of the high guide vane are embedded with each other, thereby further reducing the lateral spacing to achieve effective control of the surface temperature uniformity and thickness uniformity of the high guide vane. In the structure of the inner edge plate symmetrical protection box, the shielding baffles on all sides are designed along the structural characteristics of the inner edge plate and connected by welding; the inner support block is used on the inner side of the protection box to support the blade, ensuring that the non-coated area around the high guide vane edge plate is flush with the shielding blocks on all sides, thereby ensuring that the coated area and non-coated area of ​​the high guide vane are effectively protected.

[0009] After the blades are coated with the high-efficiency coating device, the lateral spacing of the blades increases. In order to ensure uniform surface temperature of the blades, the filament energy of the electron beam heating gun equipped with the electron beam physical vapor deposition equipment is modularly set. The longitudinal position of the filament energy blocks on both sides gradually decreases toward the middle, so as to achieve a gradual decrease in energy on both sides toward the middle, thereby ensuring uniform heating of the outer edge plates and blade body on both sides of the high-conductivity blade, so as to ensure uniform surface temperature of the two blades.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] (1) The device has a simple structure, fewer accessories, is easy to process and disassemble, and can be designed to match the tooling size according to the size of the high guide vane.

[0012] (2) The device can significantly increase the furnace loading capacity of EB-PVD equipment during processing. According to the size of the high-guide vane, the device can be used to cross-clamp two blades in a single furnace for coating processing, which doubles the production efficiency. The original furnace loading capacity of a certain machine's high-guide vane is 1 piece. Through the improvement of this device, it can be increased to 2 pieces per furnace, and the uniformity of the coating thickness meets the design requirements. The processing efficiency of the coating product is increased by 100%.

[0013] (3) The device is installed evenly and cross-distributed on both sides, and there is no mutual shielding between the blades in the axial and radial directions. The coating thickness uniformity and coating quality are good.

[0014] (4) The use of this device can significantly reduce production costs. Based on the calculation that each unit has 25 parts, the estimated manufacturing cost savings for each unit is 25 parts × 1556.7 yuan / piece = 38917.5 yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the efficient coating device.

[0016] Figure 2Schematic diagram of the U-groove embedded structure of the inner edge plate of the high-efficiency coating device structure.

[0017] Figure 3 Schematic diagram of the intermediate connection fixture structure of the high-efficiency coating device.

[0018] Figure 4 Energy distribution diagram of electron beam heating gun wire.

[0019] Figure 5 Microstructure morphology of the ceramic coating at the leading edge of the mid-section of the blade on the adaxial side.

[0020] Figure 6 Microstructure morphology of the ceramic coating in the blade basin of the mid-section of the adaxial blade.

[0021] Figure 7 Microstructure of the ceramic coating at the leading edge of the mid-section of the blade on the abaxial side.

[0022] Figure 8 Microstructure morphology of the ceramic coating in the blade basin of the mid-section of the abaxial blade. DETAILED DESCRIPTION

[0023] The present invention analyzes the size of high guide vanes and the size of tooling structure, and combines the working principle of EB-PVD equipment to design a device and a method for efficiently coating high guide vanes. The device can increase the number of high guide vane coatings from the existing 1 piece per furnace to 2 pieces per furnace according to the size of the high guide vanes and the design coating area requirements, significantly increasing the furnace capacity of high guide vane coating processing by 2 times, greatly improving coating processing efficiency, and reducing coating processing costs.

[0024] The present invention is further described with reference to the accompanying drawings:

[0025] like Figure 1As shown, the schematic diagram of the structure of the high-efficiency coating device of the present invention. The connecting rod 1-7 is used to connect with the rotating shaft of the equipment to realize the uniform rotation of the entire device driven by the rotating shaft of the equipment, so as to realize the uniform coating of the blades in the electron beam physical vapor deposition equipment; the outer edge plate protection box 1-6 of the high guide vane is connected to the connecting rod 1-7 by welding, and a total of 8 part fixing nuts 1-5 are welded thereon, which are used to fix the outer edge plate protection box 1-6 and the inner edge plate symmetrical protection box 1-4; the high guide vane 1-8 is placed in the outer edge plate protection box 1-6, and at the same time, the inner edge plate symmetrical protection box 1-4 shields and protects the inner edge plate of the high guide vane 1-8; on the inner edge plate symmetrical A total of 8 parts fixing nuts 1-3 are welded on the protection box 1-4, which are used to fix the outer edge plate protection box 1-6, the outer edge plate protection box 1-2 and the inner edge plate symmetrical protection box 1-4; the high guide blade 1-9 is placed in the inner edge plate symmetrical protection box 1-4, and finally the outer edge plate of the high guide blade 1-9 is shielded and protected by the outer edge plate protection box 1-2; a total of 8 parts fixing nuts 1-3 are welded on the inner edge plate symmetrical protection box 1-4, which are used to fix the outer edge plate protection box 1-2 and the inner edge plate symmetrical protection box 1-4; each protection box is fixed using high-temperature alloy wire.

[0026] exist Figure 2 In the figure, the high guide vanes 2-1 and 2-2 are connected by the inner edge plate symmetrical protection box 2-3. At the inner edge plate protection box 2-3, the original U-shaped grooves 2-4 in the high guide vanes are embedded in each other, thereby further reducing the lateral spacing to achieve effective control of the surface temperature uniformity and thickness uniformity of the high guide vanes.

[0027] exist Figure 3 In the figure, the structure of the symmetrical protection box of the inner edge plate is further demonstrated. The shielding baffles 3-2 on all sides are designed along the structural characteristics of the inner edge plate and are connected by welding. The inner supporting blocks 3-1 and 3-3 are used on the inner side of the protection box to support the blades, ensuring that the non-coated area around the high guide blade edge plate is flush with the shielding blocks 3-2 on all sides, thereby ensuring that the coated area and non-coated area of ​​the high guide blade are effectively protected.

[0028] After the blades are coated with a high-efficiency coating device, the lateral spacing between the blades increases. In order to ensure uniform surface temperature of the blades, the filament energy of the electron beam heating gun equipped with the electron beam physical vapor deposition equipment is modularly set. The longitudinal position of the filament energy blocks 4-1 on both sides gradually decreases toward the middle, so as to achieve a gradual decrease in energy on both sides toward the middle, thereby ensuring uniform heating of the outer edge plates and blade body on both sides of the high-conductivity blade, so as to ensure uniform surface temperature of the two blades.

[0029] Example 1

[0030] in accordance with Figure 1The structural diagram is shown in which the connecting rod 1-7 is connected to the rotating shaft of the equipment to realize the uniform rotation of the entire device driven by the rotating shaft of the equipment, so as to realize the uniform coating of the blade in the electron beam physical vapor deposition equipment; the outer edge plate protection box 1-6 of the high guide vane is connected to the connecting rod 1-7 by welding, and a total of 8 part fixing nuts 1-5 are welded thereon, which are used to fix the outer edge plate protection box 1-6 and the inner edge plate symmetrical protection box 1-4; the high guide vane 1-8 is placed in the outer edge plate protection box 1-6, and at the same time, the inner edge plate of the high guide vane 1-8 is shielded and protected by the inner edge plate symmetrical protection box 1-4; A total of 8 parts fixing nuts 1-3 are welded on the edge plate symmetrical protection box 1-4, which are used to fix the outer edge plate protection box 1-6, the outer edge plate protection box 1-2 and the inner edge plate symmetrical protection box 1-4; the high guide blade 1-9 is placed in the inner edge plate symmetrical protection box 1-4, and finally the outer edge plate of the high guide blade 1-9 is shielded and protected by the outer edge plate protection box 1-2; a total of 8 parts fixing nuts 1-3 are welded on the inner edge plate symmetrical protection box 1-4, which are used to fix the outer edge plate protection box 1-2 and the inner edge plate symmetrical protection box 1-4; each protection box is fixed using high-temperature alloy wire.

[0031] exist Figure 2 In the figure, the high guide vanes 2-1 and 2-2 are connected by the inner edge plate symmetrical protection box 2-3. At the inner edge plate protection box 2-3, the original U-shaped grooves 2-4 in the high guide vanes are embedded in each other, thereby further reducing the lateral spacing to achieve effective control of the surface temperature uniformity and thickness uniformity of the high guide vanes.

[0032] exist Figure 3 In the figure, the structure of the symmetrical protection box of the inner edge plate is further demonstrated. The shielding baffles 3-2 on all sides are designed along the structural characteristics of the inner edge plate and are connected by welding. The inner supporting blocks 3-1 and 3-3 are used on the inner side of the protection box to support the blades, ensuring that the non-coated area around the high guide blade edge plate is flush with the shielding blocks 3-2 on all sides, thereby ensuring that the coated area and non-coated area of ​​the high guide blade are effectively protected.

[0033] Figure 4 After the blades are coated with a high-efficiency coating device, the lateral spacing between the blades increases. In order to ensure uniform surface temperature of the blades, the filament energy of the electron beam heating gun equipped with the electron beam physical vapor deposition equipment is modularly set. The longitudinal position of the filament energy blocks 4-1 on both sides gradually decreases toward the middle, so as to achieve a gradual decrease in energy on both sides toward the middle, thereby ensuring uniform heating of the outer edge plates and blade body on both sides of the high-conductivity blade, so as to ensure uniform surface temperature of the two blades.

[0034] Figure 5 , Figure 6It can be seen that the microstructure of the thermal barrier coating presents a typical columnar crystal structure morphology, which indicates that the high guide vane coating prepared by the present invention has uniform structure and good performance.

[0035] Figure 7 , Figure 8 It can be seen that the microstructure of the thermal barrier coating presents a typical columnar crystal structure morphology, which indicates that the high guide vane coating prepared by the present invention has uniform structure and good performance.

[0036] Table 1 shows the ceramic coating thickness of the cross section of the two blades. The coating thickness along the profile meets the design technical requirements of 30 to 150 μm.

[0037] Table 1

[0038]

[0039]

Claims

1. A device capable of realizing high efficiency coating of high guide vane coating, characterized in that: It includes a connecting rod, a high guide vane outer edge plate protection box, a parts fixing nut, and an inner edge plate symmetrical protection box. The high guide vanes are symmetrically connected to the protection box through the inner edge plate. At the inner edge plate protection box, the U-shaped grooves of the inner edge plates of the high guide vanes are embedded in each other.

2. The device for realizing high efficiency coating of high guide vane coating according to claim 1 is characterized in that: In the structure of the symmetrical protection box of the inner edge plate, shielding baffles on all sides are connected along the inner edge plate by welding.

3. The device for realizing high efficiency coating of high guide vane coating according to claim 1 is characterized in that: An inner support block is used on the inner side of the protection box to support the blade.

4. The device for realizing high efficiency coating of high guide vane coating according to claim 1 is characterized in that: The non-coated area around the high guide vane edge plate is flush with the surrounding shielding blocks.

5. The device for achieving high efficiency coating of high guide vane coating according to claim 1 is characterized in that: The inner edge plate of the high guide vane has a fan-shaped structure and a U-shaped groove structure.

6. The device for achieving high efficiency coating of high guide vane coating according to claim 1 is characterized in that: The U-shaped grooves of the high guide vanes are placed crosswise.

7. The device for achieving high efficiency coating of high guide vane coating according to claim 1 is characterized in that: Assembly of two high guide vanes in a single furnace.

8. The device for achieving high efficiency coating of high guide vane coating according to claim 1 is characterized in that: Each protective box is fixed by high-temperature alloy wire.

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