Guider spraying clamp and spraying method
By designing the guide spray clamp and using the grille plate to block the upper part of the blade, the problem of uneven spraying of the turbine guide blade is solved, achieving uniform deposition of the coating and improving the blade performance.
Patent Information
- Application Number
- CN202510383753.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-06-10
AI Technical Summary
When slurry aluminum spraying is performed on the blades of the turbine guide, the spray gun cannot enter the blades, resulting in thicker deposited layer in the upper half and thinner lower half, resulting in uneven coating.
Design a guide spray clamp, including a spray gun, bottom stopper, grille plate, locking parts and locking nuts. The intake and exhaust edges of the upper part of the guide blade are blocked through the grille strip of the grille plate to form a spraying channel to ensure that the paint is uniformly sprayed to the lower part of the blade.
The overall spray uniformity of the turbine guide blade is achieved, avoiding the problem of excessive thickness of the upper half and excessive thinness of the lower half, and improving the service performance of the blade.
Smart Images
Figure CN120115325A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of aero-engine part machining, and in particular, to a spray fixture for a guide vane. In addition, the present application also relates to a spraying method including the above spray fixture for a guide vane. Background Art
[0002] The information provided in this part is for the purpose of generally presenting the background of the present application. To the extent described in this part, the work of the currently named inventors and aspects that may not constitute the prior art description at the time of filing are neither explicitly nor implicitly considered to be the prior art of the present application.
[0003] The turbine guide vane is an annular stationary cascade composed of inner and outer rings and a group of guide vanes, which converts part of the thermal energy of the air flow into kinetic energy and flows out in a certain direction to drive the working wheel to do work. Its working conditions are harsh, with high temperature and large thermal and cold changes. A high-temperature protective coating needs to be applied on the blade surface to improve the service performance. The most commonly used protective coating for the turbine guide vane is an aluminized coating, and the slurry aluminizing process is simple and cost-effective, which is a common process method for realizing the coating of the guide vane blades.
[0004] The overall guide vane has a complex structure, with each blade having a certain angle with the end face and a small blade grid pitch (please refer to the attached drawings of the specification Figure 2 ). The spray gun cannot enter between the blades to spray the entire surface of a single blade. The spray gun can only deposit the coating on the blade surface by making a certain angle with the blade above the blade. The spraying of the coating to the adjacent blade surface will be partially blocked by the adjacent blade. Therefore, the deposition layer on the upper half of the unblocked blade is thicker, while the lower half blocked by the adjacent blade is thinner. Since the slurry aluminizing spraying generally needs to be sprayed multiple times to reach a certain thickness, the multiple spraying further increases the coating non-uniformity between the unblocked part and the blocked part. It can be seen that during the slurry aluminizing spraying process of the guide vane blades, there is a problem that when using the conventional spraying method for the overall turbine guide vane with a narrow blade grid pitch, adjacent blades will block, resulting in uneven slurry aluminizing on the surface between the blocked and unblocked surfaces of the blades.
[0005] It should be noted that the information disclosed in the above background art part is only used to strengthen the understanding of the background of the present application. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention
[0006] In view of at least one of the above technical problems, the present application provides a spray fixture for a guide vane, which can clamp the turbine guide vane and cover the intake and exhaust edges of the upper part of the guide vane blades through a grille plate, avoiding a thicker spraying deposition layer on the upper half, and effectively realizing the overall spraying uniformity of the guide vane blades.
[0007] Meanwhile, the present application also provides a spraying method including the above-mentioned guide vane spraying fixture.
[0008] According to one aspect of the present application, there is provided a guide vane spraying fixture, including a spray gun for spraying paint on the guide vanes of a turbine guide vane. The guide vane spraying fixture further includes a bottom limiting member, a grille plate, a locking member and a locking nut:
[0009] The bottom limiting member is used for supporting and limiting the turbine guide vane. A first limiting hole is formed in the bottom limiting member. The first end of the locking member is used to sequentially pass through the first limiting hole and the central hole of the turbine guide vane to limit the turbine guide vane, and the second end of the locking member is used to abut against the bottom limiting member and is limited by the bottom limiting member; the grille plate is used to sleeve on the first end of the locking member and is arranged to fit the end face of the turbine guide vane. A plurality of grille bars are annularly and arrayedly arranged on the grille plate. The grille bars are used to cover the inlet and exhaust edges of the upper part of the guide vanes. A spraying channel is formed between adjacent grille bars for the spray gun to spray paint on the lower part of the guide vanes; the locking nut is in threaded cooperation with the second end of the locking member, and the locking nut is used to press the grille plate and simultaneously limit the grille plate and the turbine guide vane.
[0010] In some embodiments of the present application, a circle of limiting baffles is arranged on the surface of the bottom limiting member facing the grille plate, and the limiting baffles are used to limit the outer ring of the turbine guide vane.
[0011] In some embodiments of the present application, an anti-slip cushion plate is arranged on the bottom limiting member. The anti-slip cushion plate is connected to the inner wall of the limiting baffle by a spring, and the anti-slip cushion plate is used to abut against the outer ring of the turbine guide vane under the elastic force of the spring.
[0012] In some embodiments of the present application, a circle of limiting grooves is formed around the first limiting hole on the surface of the bottom limiting member away from the grille plate. A limiting platform is arranged at the second end of the locking member, and the limiting grooves are used to limit the limiting platform.
[0013] In some embodiments of the present application, the locking member includes a locking stud. The locking stud is used to sequentially pass through the first limiting hole and the central hole of the turbine guide vane and then connect with a preset second limiting hole on the grille plate. A strip-shaped limiting groove is formed on the locking stud, and a limiting protrusion is arranged on the inner wall of the second limiting hole. The strip-shaped limiting groove is used to slide-guide the limiting protrusion during the process of the grille plate being sleeved on the locking stud through the second limiting hole, so as to limit the rotation of the grille plate.
[0014] In some embodiments of the present application, the width of the grille bar is 1 / 3 - 2 / 3 of the distance between adjacent guide vanes.
[0015] According to another aspect of the present application, a guide vane spraying method is also provided, which adopts the above-mentioned guide vane spraying fixture. The guide vane spraying method includes the following steps:
[0016] S100. Load the turbine guide vane into the bottom limiting member, sequentially pass the locking member through the bottom limiting member and the turbine guide vane, sleeved the grille plate on the locking member, and press and abut the grille plate against the turbine guide vane through the locking nut;
[0017] S200. Tilt the spray gun and spray the coating on the guide vane through the spraying channel. The spraying angle of the spray gun is inclined relative to the surface of the grille plate, and curing is carried out after spraying;
[0018] S300. After curing is completed, disassemble the guide vane spraying fixture, spray the guide vane again, and carry out curing after spraying;
[0019] S400. Carry out vacuum high-temperature diffusion on the whole sprayed turbine guide vane, with a diffusion temperature of 980 °C and a diffusion time of 8 h;
[0020] S500. Use metallographic sectioning parts to check the coating thickness, and check the infiltration layer thickness of the upper half, middle part and lower half of the guide vane respectively.
[0021] In some embodiments of the present application, the tilting angle of the spray gun in step S200 is 30°-70° with respect to the upper end face of the turbine guide vane.
[0022] In some embodiments of the present application, the number of sprayings is 3 times, and curing is carried out after each spraying, with a curing temperature of 80 °C and a curing time of 28-32 min.
[0023] In some embodiments of the present application, in step S300, the number of sprayings is 5 times, and curing is carried out after each spraying, with a curing temperature of 80 °C and a curing time of 28-32 min.
[0024] The present application has the following beneficial effects:
[0025] A guide vane spraying fixture of the present application supports and positions the turbine guide vane through the bottom limiting member. At the same time, the locking member sequentially passes through the bottom limiting member, the turbine guide vane and the grille plate and then is connected with the locking nut. The grille plate is pressed and fitted to the end face of the turbine guide vane through the locking nut, and the intake and exhaust edges of the upper part of the guide vane are blocked by the grille bars of the grille plate. Subsequently, the coating is sprayed on the guide vane through the spray gun. Due to the blocking of the grille bars, the coating is not easy to deposit on the upper part of the guide vane. And the grille plate can be quickly and conveniently disassembled by loosening the locking nut, which is convenient for subsequent spraying of the guide vane again to achieve a uniform spraying effect of the whole part and effectively improve the service performance of the guide vane.
[0026] The spray coating method of the present application for the guide vane also has the above beneficial effects. It also includes that the overall installation and disassembly of the spray coating fixture is very convenient and fast, which is convenient for installing the grille plate for the first spray coating to avoid the easy formation of paint deposition on the upper part of the guide vane blades. Subsequently, the fixture is disassembled for re-spraying, so that on the premise of meeting the spray coating requirements for the coating thickness of the guide vane blades, the uniformity of the coating thickness can be effectively improved, solving the problem that the spray gun for the overall turbine guide vane with a narrow blade cascade spacing cannot enter between the blades to achieve the full-surface spraying of a single blade, and direct spraying is likely to cause uneven aluminizing of the surface slurry on the shielded surface and the unshielded surface of the blade.
[0027] Of course, it is not necessary for any product implementing the present application to simultaneously achieve all the above-mentioned advantages. In addition to the purposes, features, and advantages described above, the present application has other purposes, features, and advantages. The following will refer to the drawings to further elaborate on the present application in detail. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The drawings forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:
[0029] Figure 1 is a schematic diagram of the overall structure of the spray coating fixture of the preferred embodiment of the present application;
[0030] Figure 2 is a schematic diagram of the turbine guide vane of the preferred embodiment of the present application;
[0031] Figure 3 is a schematic diagram of uneven coating after conventional spray coating in the prior art;
[0032] Figure 4 is a schematic diagram of the spray coating process of the preferred embodiment of the present application;
[0033] Figure 5 is a schematic diagram of uniform coating after spray coating using the spray coating fixture and the improved spray coating method of the preferred embodiment of the present application;
[0034] Figure 6 is a schematic diagram of the structure of the bottom limiting member of the preferred embodiment of the present application;
[0035] Figure 7 is a schematic cross-sectional structure diagram of the bottom limiting member of the preferred embodiment of the present application;
[0036] Figure 8 is a schematic diagram of the structure of the grille plate of the preferred embodiment of the present application;
[0037] Figure 9 is a schematic diagram of the structure of the locking member of the preferred embodiment of the present application;
[0038] Figure 10 is a schematic structural view of a locking nut according to a preferred embodiment of the present application;
[0039] Legend: 100, turbine guide; 101, guide vane; 1, spray gun; 2, bottom limiting member; 21, first limiting hole; 22, limiting groove; 23, limiting baffle; 3, grille plate; 31, second limiting hole; 32, grille bar; 33, limiting protrusion; 34, spraying channel; 4, locking member; 41, locking stud; 42, limiting platform; 43, strip-shaped limiting groove; 5, locking nut; 6, coating. Detailed implementation manners
[0040] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in many different ways defined and covered by the following.
[0041] Figure 1 is a schematic overall structural view of a spraying fixture according to a preferred embodiment of the present application; Figure 2 is a schematic view of a turbine guide according to a preferred embodiment of the present application; Figure 3 is a schematic view of uneven coating after conventional spraying in the prior art; Figure 4 is a schematic view of a spraying process according to a preferred embodiment of the present application; Figure 5 is a schematic view of a uniform coating after spraying using a spraying fixture and an improved spraying method according to a preferred embodiment of the present application; Figure 6 is a schematic structural view of a bottom limiting member according to a preferred embodiment of the present application; Figure 7 is a schematic cross-sectional structural view of a bottom limiting member according to a preferred embodiment of the present application; Figure 8 is a schematic structural view of a grille plate according to a preferred embodiment of the present application; Figure 9 is a schematic structural view of a locking member according to a preferred embodiment of the present application; Figure 10 is a schematic structural view of a locking nut according to a preferred embodiment of the present application.
[0042] A guide spraying fixture includes a spray gun 1 for spraying a coating 6 on the guide vanes 101 of a turbine guide 100. The guide spraying fixture further includes a bottom limiting member 2, a grille plate 3, a locking member 4 and a locking nut 5:
[0043] The bottom limiting member 2 is used to support and limit the turbine guide vane 100. A first limiting hole 21 is formed in the bottom limiting member 2. The first end of the locking member 4 is used to sequentially pass through the first limiting hole 21 and the central hole of the turbine guide vane 100 to limit the turbine guide vane 100, and the second end of the locking member 4 is used to abut against the bottom limiting member 2 and is limited by the bottom limiting member 2; the grille plate 3 is used to sleeved on the first end of the locking member 4 and is arranged to fit the end face of the turbine guide vane 100. A plurality of grille bars 32 are annularly arranged on the grille plate 3. The grille bars 32 are used to cover the intake and exhaust edges of the upper part of the guide vane blade 101. A spraying channel 34 is formed between adjacent grille bars 32. The spraying channel 34 is used to supply the spray gun 1 to spray the coating material 6 to the lower part of the guide vane blade 101; the locking nut 5 is in threaded cooperation with the second end of the locking member 4. The locking nut 5 is used to press the grille plate 3 and simultaneously limit the grille plate 3 and the turbine guide vane 100.
[0044] The meaning of the "bottom limiting member 2" here refers to the working platform for supporting and limiting the bottom of the turbine guide vane 100. In some embodiments, the bottom limiting member 2 is a circular plate-like structure, and a first limiting hole 21 is formed in the middle thereof, and limiting baffles 23 are arranged around to perform radial limiting on the turbine guide vane 100.
[0045] The "coating material 6" here refers to a high-temperature protective coating for improving the service performance of the guide vane blade 101. In some embodiments, the coating material 6 is an aluminized coating.
[0046] In some embodiments, the side wall of the grille bar 32 is inclined to form a diversion channel extending along the tangential direction of the blade surface, so that the coating material 6 can be sprayed more smoothly onto the lower part of the guide vane blade 101.
[0047] In this application, the bottom limiting member 2 is used to support and limit the turbine guide vane 100. At the same time, the locking member 4 sequentially passes through the bottom limiting member 2, the turbine guide vane 100 and the grille plate 3 and then is connected to the locking nut 5. The locking nut 5 presses the grille plate 3 to fit the end face of the turbine guide vane 100, and the grille bars 32 of the grille plate 3 cover the intake and exhaust edges of the upper part of the guide vane blade 101. Subsequently, the spray gun 1 sprays the coating material 6 on the guide vane blade 101. Due to the shielding of the grille bars 32, the coating material 6 is not easily deposited on the upper part of the guide vane blade 101. The grille plate 3 can be quickly and conveniently disassembled by loosening the locking nut 5, which is convenient for subsequent spraying of the guide vane blade 101 again to achieve a uniform spraying effect of the whole part and effectively improve the service performance of the guide vane blade 101.
[0048] Preferably, please refer to Figure 6 and 7As shown, a circle of limiting baffles 23 is provided on the side of the bottom limiting member 2 facing the grille plate 3, and the limiting baffles 23 are used to limit the outer ring of the turbine guide vane 100.
[0049] It can be understood that after the turbine guide vane 100 is placed on the bottom limiting member 2, on the one hand, the locking member 4 passes through the central hole of the turbine guide vane 100 to achieve a positioning effect on the turbine guide vane 100, and a circle of limiting baffles 23 provided on the bottom limiting member 2 can limit and shield the outer ring of the turbine guide vane 100, and cooperate with the locking member 4 to achieve stable limiting of the turbine guide vane 100.
[0050] Optionally, an anti-slip cushion plate is provided on the bottom limiting member 2, and the anti-slip cushion plate is connected to the inner wall of the limiting baffle 23 by a spring, and the anti-slip cushion plate is used to abut against the outer ring of the turbine guide vane under the elastic force of the spring.
[0051] It can be understood that the anti-slip cushion plate is connected to the inner wall of the limiting baffle 23 by a spring, which can realize flexible adjustment of the position of the anti-slip cushion plate, so as to adapt to the clamping and fixing of turbine guide vanes 100 of different sizes, and effectively improve the adaptability of the guide vane fixture. At the same time, it can also strengthen the clamping limit strength of the turbine guide vane 100 through the anti-slip cushion plate, and the protective cushion plate and the spring can also play a buffering and protecting effect on the turbine guide vane 100.
[0052] Specifically, a plurality of anti-slip cushion plates are arranged in a circular array on the bottom limiting member 2, and a soft anti-slip pad is provided on the surface of the anti-slip cushion plate in contact with the turbine guide vane 100.
[0053] Preferably, please refer to Figure 7 and 9 As shown, a circle of limiting grooves 22 is provided around the first limiting hole 21 on the side of the bottom limiting member 2 away from the grille plate 3, and a limiting platform 42 is provided at the second end of the locking member 4, and the limiting grooves 22 are used to limit the limiting platform 42.
[0054] It can be understood that the locking member 4 can abut against the bottom surface of the bottom limiting member 2 through the limiting platform 42 to limit the locking member 4, and the limiting groove 22 can further play a role in limiting the limiting platform 42, which is beneficial to improving the assembly stability of the locking member 4, and then realizing the accuracy and stability of the positioning of the turbine guide vane 100 through the locking member 4.
[0055] In this preferred embodiment, the depth of the limiting groove 22 is greater than the thickness of the limiting platform 42. In this way, the limiting platform 42 can be completely placed in the limiting groove 22, avoiding the limiting platform 42 protruding out of the bottom surface of the bottom limiting member 2 and affecting the installation or placement stability of the limiting platform 42. At the same time, it can also avoid the locking member 42 being easily knocked, affecting the positioning stability of the turbine guide vane 100.
[0056] Preferably, please refer to Figure 1 、 8 、as shown in Figure 9, the locking member 4 includes a locking stud 41. The locking stud 41 is used to sequentially pass through the first limiting hole 21 and the central hole of the turbine guide vane 100 and then connect with the preset second limiting hole 31 on the grille plate 3. A strip-shaped limiting groove 43 is formed on the locking stud 41, and a limiting protrusion 33 is arranged on the inner wall of the second limiting hole 31. The strip-shaped limiting groove 43 is used to slide-guide the limiting protrusion 33 during the process of the grille plate 3 being sleeved on the locking stud 41 through the second limiting hole 31, thereby rotationally limiting the grille plate 3.
[0057] It can be understood that the strip-shaped limiting groove 43 on the locking stud 41 is axially formed along the locking stud 41. The limiting protrusion 33 can be slide-guided through the strip-shaped limiting groove 43, thereby realizing slide-guiding of the grille plate 3 and restricting the rotation of the grille plate 3. After the grille bars 32 of the grille plate 3 are aligned with the respective guide vane blades 101, the grille plate 3 can be stably pressed against the end face of the turbine guide vane 100 by the lock nut 5 in cooperation with the locking stud 41, which is convenient for subsequently spraying the paint 6 onto the surface of the guide vane blades 101 stably through the spraying channel 34 by the spray gun 1, and reducing the influence of the grille plate 3 on spraying.
[0058] Preferably, the width of the grille bars 32 is 1 / 3 - 2 / 3 of the distance between adjacent guide vane blades 101.
[0059] It can be understood that since the turbine guide vane 100 is in the form of an integral structure with a narrow vane cascade pitch, the distance between adjacent guide vane blades 101 is very small. In order for the grille bars 32 to cover the blade inlet edge or exhaust edge near the guide vane end face, the width of the grille bars 32 is designed to be more than 1 / 3 of the distance between adjacent guide vane blades 101, which can meet the covering requirement; while the width of the grille bars 32 cannot block the normal spraying operation of the spray gun 1 spraying the paint 6 onto the surface between the guide vane blades 101. Therefore, the width of the grille bars 32 is designed to be less than 2 / 3 of the distance between adjacent guide vane blades 101, so as to leave enough gaps to form the spraying channel 34 for spraying the surface of the guide vane blades 101.
[0060] According to another aspect of the present application, a guide vane spraying method is also provided. The guide vane spraying method uses the above-mentioned guide vane spraying fixture, and the guide vane spraying method includes the following steps:
[0061] S100. Install the turbine guide vane 100 into the bottom limiting member 2. Pass the locking member 4 sequentially through the bottom limiting member 2 and the turbine guide vane 100, sleeved the grille plate 3 on the locking member 4, and press and abut the grille plate 3 against the turbine guide vane 100 by the lock nut 5;
[0062] S200. Tilt the spray gun 1 and spray the coating material 6 on the guide vane 101 through the spraying channel 34. The spraying angle of the spray gun 1 is inclined relative to the surface of the grille plate 3, and perform curing after spraying;
[0063] S300. After curing is completed, disassemble the guide vane spraying fixture, spray the guide vane 101 again, and perform curing after spraying;
[0064] S400. Perform vacuum high-temperature diffusion on the entire sprayed turbine guide vane 100, with a diffusion temperature of 980 °C and a diffusion time of 8 h;
[0065] S500. Use metallographic sectioning of the part to check the coating thickness, and check the infiltration layer thickness of the upper half, middle part, and lower half of the guide vane 101 respectively.
[0066] The guide vane spraying method of the present application also has the above beneficial effects. It also includes that the overall installation and disassembly of the spraying fixture is very convenient and fast, which is convenient for installing the grille plate 3 for primary spraying to avoid the formation of coating deposition on the upper part of the guide vane 101. Subsequently, disassemble the fixture and perform secondary spraying, which can effectively improve the uniformity of the coating thickness on the premise of meeting the spraying requirements of the coating thickness of the guide vane 101, and solve the problem that the spraying gun of the overall turbine guide vane with a narrow vane cascade spacing cannot enter between the vanes to spray the entire surface of a single vane, and direct spraying is likely to cause uneven surface slurry aluminizing between the shielded surface and the unshielded surface of the vane.
[0067] Preferably, in step S200, the inclination angle of the spray gun 1 is 30° - 70° with respect to the upper end face of the turbine guide vane 100.
[0068] Specifically, the inclination angle of the spray gun 1 is parallel to the connection line between the cross-section of the guide vane 101 and the center point of the turbine guide vane 100, so that the spray gun 1 can more smoothly spray the lower part of the guide vane 101 along the side surface of the guide vane 101.
[0069] It can be understood that since the side wall of the guide vane 101 is not in a straight line shape, in order to improve the more uniform spraying of the surface of the guide vane 101 by the spray gun 1, it is necessary to avoid direct spraying of the spray gun 1 perpendicular to the upper end face of the turbine guide vane 100. Preferably, the grille bar 32 has a certain inclination angle with the guide vane 101, then tilting the spray gun 1 at an angle of 30° - 70° can more smoothly make the coating material 6 pass through the spraying channel 34 and achieve a wider spraying coverage.
[0070] Preferably, the number of spraying times is 3 times, and curing is performed after each spraying. The curing temperature is 80 °C and the curing time is 28 - 32 min.
[0071] It can be understood that the spray coating on the surface of the part generally needs to be sprayed multiple times to reach the required thickness. Since the upper part of the guide vane 101 is covered by the grid bars 32, when spraying at this time, the coating material 6 is mainly deposited on the lower part of the guide vane 101. Since the spraying fixture needs to be disassembled and sprayed again later, the number of sprays this time does not need to be carried out according to the conventional number of sprays, and the number of sprays can be reduced to 0.4 - 0.8 times the conventional number of sprays. In some embodiments, before the guide vane spraying fixture is not used, the conventional number of sprays is 5 times, and only 3 times are needed after improvement, that is, the preliminary deposition of the coating on the lower part of the guide vane 101 can be completed.
[0072] Preferably, in step S300, the number of sprays is 5 times, and after each spray, curing is carried out. The curing temperature is 80°C, and the curing time is 28 - 32 min.
[0073] It can be understood that since the spraying fixture is disassembled, the upper part of the guide vane 101 is not blocked at this time, and the required coating thickness can be formed on the upper part of the guide vane 101 by the conventional number of sprays. At this time, only the conventional number of sprays before the guide vane spraying fixture is not used needs to be carried out for spraying.
[0074] In some embodiments, the bottom limiting member 2, the grid plate 3, the locking member 4 and the locking nut 5 are made of polytetrafluoroethylene, ensuring that the overall weight of the guide vane spraying fixture is relatively light and the processing difficulty such as grooving is low. The specific spraying process is as follows:
[0075] Clamp the turbine guide vane 100 onto the spraying fixture, tilt the spray gun 1 by 50° and spray the surface of the guide vane 101 through the spraying channel 34. Since the spray coating on the guide vane 101 of this type of turbine guide vane 100 needs to be sprayed 5 times on the surface to reach the required thickness, after using the above-mentioned guide vane spraying fixture, the number of sprays can be reduced to 0.6 times for spraying, that is, only 3 sprays are needed. After each spray, curing is carried out. The curing temperature is 80°C, and the curing time is 30 min. Since the grid plate 3 will block the upper half of the adjacent two guide vanes 101 close to the spray gun, the coating material will not or less deposit on the upper half of the guide vane 101, and there is no coating or a thinner coating on the upper half. In the lower part far from the spray gun, there is no tooling block, and the coating material can pass through the spraying channel 3 of the grid plate 3 and deposit on the surface of the guide vane 101, so as to form a certain thickness in the lower part.
[0076] After curing, remove the spraying fixture;
[0077] Subsequently, the guide vane 101 is subjected to conventional spraying 5 times, and curing is carried out after each spraying. The curing temperature is 80 °C and the curing time is 30 min. This step can achieve spraying on the upper part of the guide vane 101 to form a coating with sufficient thickness; since a certain thickness of the coating is pre-deposited on the lower half during spraying with the spraying fixture, a certain thickness is formed by superimposing and removing the spraying fixture for spraying, and the thickness of the lower half will generally be similar to the thickness of the coating on the upper half, thereby improving the overall thickness uniformity of the blade.
[0078] Subsequently, vacuum high-temperature diffusion is carried out at a diffusion temperature of 980 °C for 8 h to complete the preparation of the metal penetration layer.
[0079] Finally, the coating thickness is inspected by metallographic sectioning of the part. The thickness of the penetration layer on the upper half of the guide vane 101 is 40 - 45 μm, the thickness of the penetration layer in the middle part is 39 - 45 μm, and the thickness of the penetration layer on the lower half is 38 - 44 μm.
[0080] Through the comparative example of conventional spraying, it is found that the coating thickness of each section of the guide vane 101 during conventional spraying is: the thickness of the penetration layer on the upper half is 40 - 45 μm, the thickness of the penetration layer in the middle part is 34 - 40 μm, and the thickness of the penetration layer on the lower half is 20 - 30 μm.
[0081] Obviously, the thickness uniformity of the coating on each section of the guide vane 101 is effectively improved by the optimized spraying method of this application.
[0082] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0083] Specific examples are used in this article to elaborate on the principle and implementation mode of this application. The description of the above examples is only used to help understand the method and its core idea of this application. The above is only the preferred implementation mode of this application. It should be pointed out that due to the limited nature of written expression and objectively existing infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, should all be regarded as the protection scope of this application.
Claims
1. A guide vane spraying fixture, comprising a spray gun (1), the spray gun (1) being used for spraying a coating (6) on a guide vane (101) of a turbine guide vane (100), characterized in that: The guide spraying fixture also includes a bottom stopper (2), a grid plate (3), a locking member (4) and a locking nut (5): The bottom limiting member (2) is used to support and limit the turbine guide (100); a first limiting hole (21) is provided on the bottom limiting member (2); a first end of the locking member (4) is used to sequentially pass through the first limiting hole (21) and the center hole of the turbine guide (100) and limit the turbine guide (100); a second end of the locking member (4) is used to abut against the bottom limiting member (2) and be limited by the bottom limiting member (2); the grille plate (3) is used to be sleeved on the first end of the locking member (4) and to be arranged in contact with the end surface of the turbine guide (100); A plurality of grille bars (32) are arranged in an annular array on the grille plate (3), the grille bars (32) being used to cover the inlet and outlet edges of the upper portion of the guide vane (101), a spraying channel (34) being formed between adjacent grille bars (32), the spraying channel (34) being used for a spray gun (1) to spray paint (6) onto the lower portion of the guide vane (101); a locking nut (5) is threadably matched with the second end of the locking member (4), the locking nut (5) being used to press the grille plate (3) and simultaneously limit the grille plate (3) and the turbine guide vane (100).
2. A guide spraying fixture according to claim 1, characterized in that: A circle of limiting baffles (23) is provided on one side of the bottom limiting member (2) facing the grid plate (3), and the limiting baffles (23) are used to limit the outer circle of the turbine guide vane (100).
3. A guide spraying fixture according to claim 2, characterized in that: An anti-skid pad is provided on the bottom limit member (2), and the anti-skid pad is connected to the inner wall of the limit baffle (23) via a spring. The anti-skid pad is used to press against the outer ring of the turbine guide (100) under the elastic force of the spring.
4. A guide spraying fixture according to claim 1, characterized in that: A circle of limiting grooves (22) are provided on a side of the bottom limiting member (2) away from the grille plate (3) and around the first limiting hole (21); a limiting platform (42) is provided at the second end of the locking member (4); and the limiting grooves (22) are used to limit the limiting platform (42).
5. A guide spraying fixture according to claim 1, characterized in that: The locking member (4) comprises a locking stud (41), which is used to pass through the first limiting hole (21) and the central hole of the turbine guide (100) in sequence and then connect with the second limiting hole (31) preset on the grille plate (3). A strip-shaped limiting groove (43) is provided on the locking stud (41), and a limiting protrusion (33) is provided on the inner wall of the second limiting hole (31). The strip-shaped limiting groove (43) is used to slide and guide the limiting protrusion (33) when the grille plate (3) is inserted into the locking stud (41) through the second limiting hole (31), thereby limiting the rotation of the grille plate (3).
6. A guide spraying fixture according to claim 1, characterized in that: The width of the grid bars (32) is 1 / 3-2 / 3 of the distance between adjacent guide vanes (101).
7. A guide spraying method, characterized in that: Using the guide spraying fixture as described in any one of claims 1 to 6, the guide spraying method comprises the following steps: S100, inserting the turbine guide (100) into the bottom stopper (2), passing the locking member (4) through the bottom stopper (2) and the turbine guide (100) in sequence, sleeve-mounting the grille plate (3) on the locking member (4), and pressing the grille plate (3) to abut against the turbine guide (100) through the locking nut (5); S200, tilting the spray gun (1) and spraying the coating (6) on the guide vane (101) through the spray channel (34), wherein the spray angle of the spray gun (1) is tilted relative to the surface of the grid plate (3), and curing is performed after spraying; S300, after the curing is completed, the guide spraying fixture is disassembled, and the guide blade (101) is sprayed again, and then cured after spraying; S400, subjecting the sprayed turbine guide vane (100) to vacuum high-temperature diffusion as a whole, with the diffusion temperature at 980° C. and the diffusion time at 8 h; S500, using metallographic sectioning to check the coating thickness, and checking the thickness of the carburized layer in the upper half, middle part and lower half of the guide vane (101) respectively.
8. A guide spraying method according to claim 7, characterized in that: In step S200, the spray gun (1) is tilted at an angle of 30°-70° with respect to the upper end surface of the turbine guide (100).
9. A guide spraying method according to claim 8, characterized in that: The spraying is performed 3 times, and curing is performed after each spraying. The curing temperature is 80°C and the curing time is 28-32 minutes.
10. A guide spraying method according to claim 7, characterized in that: In step S300, the spraying is performed 5 times, and curing is performed after each spraying. The curing temperature is 80° C. and the curing time is 28-32 minutes.