Method for manufacturing a serrated shroud turbine blade protection clamp and protection clamp

Abstract

The application discloses a preparation method of a serrated shroud turbine blade protection clamp, and comprises the following steps: S1, a parallelepiped-shaped clamp base body is processed according to the shroud contour size of a turbine blade and a preset wall thickness when the clamp holds the turbine blade; S2, the clamp base body is divided into a holding end part and an assembly end part along the vertical direction according to the shroud contour size of the turbine blade, and an assembly hole is processed on the assembly end part along the horizontal direction of the assembly end part; S3, the clamp base body is divided into a first clamp body, a second clamp body and a third clamp body along the axial direction of the assembly hole according to the contour size of the serrated edge of the shroud of the turbine blade, and the first clamp body, the second clamp body and the third clamp body can be disassembled through the assembly hole and screws; and S4, the holding end part on the second clamp body is processed according to the shroud contour size of the turbine blade, so that the first clamp body, the second clamp body and the third clamp body form a groove for holding and protecting the shroud of the turbine blade after being assembled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine blade machining protection, in particular, relates to a preparation method of a serrated shroud turbine blade protection clamp. In addition, the present application also relates to a serrated shroud turbine blade protection clamp prepared by the preparation method of the serrated shroud turbine blade protection clamp. BACKGROUND

[0002] Turbine blades are important parts of power machinery such as aero-engines, steam turbines and gas turbines. However, turbine blades not only work in high-temperature gas environment, but also bear centrifugal force, aerodynamic force, thermal stress and vibration load when the rotor rotates at high speed. In addition, turbine blades are also prone to corrosion under the action of hot gas, and are the most severe working environment parts in aero-engines. Turbine blades can be divided into three types according to the shroud structure characteristics, i.e. no shroud turbine blade, parallelogram shroud turbine blade and serrated shroud turbine blade. Turbine blades in advanced engines often adopt shroud structure to improve turbine efficiency and solve vibration problems. In particular, serrated shroud turbine blades have better vibration reduction effect than parallelogram shroud turbine blades, and are commonly used in many advanced engine turbine blade structures.

[0003] In addition, in order to improve the high-temperature gas corrosion resistance and high-temperature oxidation resistance of turbine blades, anti-high-temperature gas corrosion coating or anti-high-temperature oxidation protective coating is often coated on the surface of the blade by spraying or physical vapor deposition process. During the coating process, the tenon and shroud parts of the blade need to be protected to prevent the coating from being coated on the surface, thereby reducing the weight of the blade and avoiding affecting the assembly accuracy of the blade. Before coating the blade, a sandblasting pretreatment process is generally used to remove the oxide film on the surface of the blade or increase the surface roughness of the blade, thereby improving the bonding strength between the coating and the substrate. In order to meet the assembly accuracy requirements of the parts, the shroud and tenon parts of the blade also need to be protected during sandblasting.

[0004] However, the profile of the serrated shroud turbine blade is irregular, and the bending deformation is large, especially the shroud part, the size precision is high, the protection precision of sandblasting and coating is also high, and the protection process is difficult. In order to meet the quality requirements of the serrated shroud turbine blade, the following two methods are often used in the process of sandblasting and coating: 1. Using heat-resistant adhesive tape for protection; 2. Removing the coating on the shroud part after coating. However, the first method has the following disadvantages: 1. High cost, the price of heat-resistant adhesive tape is relatively high, and sandblasting and coating coating are required, but heat-resistant adhesive tape is a consumable that cannot be reused, and large-scale use will result in high production cost; 2. Low protection efficiency, due to the irregular shape of the serrated shroud turbine blade, the bending deformation is large, the shroud is connected with the flow channel surface of the upper edge plate, and the heat-resistant adhesive tape is used for protection, the shroud part needs to be protected, and the flow channel surface of the upper edge plate cannot be shielded, so the protection is difficult, the protection time is long, and at least 30 minutes is required for one piece of the structure blade. If the heat-resistant adhesive tape is used for protection, the adhesive tape needs to be removed after sandblasting and coating, which is time-consuming and tedious, and if the cleaning is not careful and thorough, there may be residual adhesive tape, which becomes an extra material on the surface of the blade, and cannot meet the quality requirements; 3. Low protection reliability, the shroud is closely connected with the flow channel surface of the upper edge plate, and the heat-resistant adhesive tape is used for protection, which easily causes the shielding of the flow channel surface of the upper edge plate, affecting the integrity of the coating of the coated part. In addition, the heat-resistant adhesive tape is subjected to force or high temperature during sandblasting and coating, and the adhesive tape is easily damaged, causing sandblasting or coating leakage of the shroud or tenon part, so the reliability of the protection is low, resulting in poor quality and consistency of the parts. The second method has the following disadvantages: low production efficiency and unguaranteed quality, due to the irregular shape and large bending deformation of the serrated shroud, and high size precision, the difficulty of processing after coating is very large, which is time-consuming and has low processing qualification rate. However, if the coating is not processed after coating, the coating on the shroud part will increase the weight of the blade, increase the load of the tenon and the disc, affect the performance of the turbine rotor, and increase the size of the shroud, affect the assembly gap, cause the shroud to wear, and affect the performance of the engine. SUMMARY

[0005] The present application provides a preparation method of a serrated shroud turbine blade protection clamp and a protection clamp, to solve the technical problems of high protection cost, low efficiency and unguaranteed processing quality of the shroud part of the existing serrated shroud turbine blade during turbine blade sandblasting and coating.

[0006] According to one aspect of the present application, a method for manufacturing a serrated shroud turbine blade protection fixture is provided, comprising the following steps: S1, processing a fixture base body in a parallelepiped shape according to the shroud profile size of a turbine blade and a preset wall thickness when the fixture clamps the turbine blade; S2, dividing the fixture base body into a clamping end and an assembly end along the vertical direction according to the shroud profile size of the turbine blade, and processing an assembly hole on the assembly end along the horizontal direction of the assembly end; S3, dividing the fixture base body into a first fixture part, a second fixture part and a third fixture part along the axial direction of the assembly hole according to the profile size of the serrated edge of the shroud of the turbine blade, and the first fixture part, the second fixture part and the third fixture part can be disassembled through the assembly hole and screws; S4, processing the clamping end on the second fixture part according to the shroud profile size of the turbine blade, so that the first fixture part, the second fixture part and the third fixture part form a groove for clamping and protecting the shroud of the turbine blade after assembly.

[0007] As a further improvement of the above technical solution:

[0008] Further, before step S1, the method further comprises the step of: obtaining the shroud profile size, the profile size of the flow passage surface at the shroud, the profile size of the serrated edge of the shroud, and the profile size of the right-angle edge of the shroud by profiling processing of the turbine blade.

[0009] Further, after the step of dividing the fixture base body into the clamping end and the assembly end along the vertical direction, the method further comprises the step of: processing the upper end surface of the clamping end according to the profile size of the flow passage surface at the shroud of the turbine blade, so that the profile of the upper end surface of the clamping end is the same as the profile of the flow passage surface at the shroud of the turbine blade.

[0010] Further, after step S4, the method further comprises the step of: processing a positioning step on the side wall of the groove for positioning the shroud of the turbine blade according to the profile size of the right-angle edge of the shroud of the turbine blade.

[0011] Further, the preset wall thickness is 3mm-5mm.

[0012] Further, a preset gap is maintained between the groove and the tooth top of the shroud of the clamped turbine blade, and the preset gap is 1mm-3mm.

[0013] According to another aspect of the present application, a serrated shroud turbine blade protection fixture is also provided, which is manufactured by the above-mentioned method for manufacturing a serrated shroud turbine blade protection fixture. The protection fixture comprises a first fixture part, a second fixture part and a third fixture part, the first fixture part, the second fixture part and the third fixture part enclose a groove for clamping and protecting the shroud of the turbine blade, and the first fixture part and the second fixture part are detachably connected, and the second fixture part and the third fixture part are detachably connected.

[0014] As a further improvement of the above technical solution,

[0015] Further, the protection clamp further comprises an assembly hole penetrating through the first clamping body, the second clamping body and the third clamping body and avoiding the recess, a first screw threadedly connected with the assembly hole and used for connecting the first clamping body and the second clamping body, and a second screw threadedly connected with the assembly hole and used for connecting the second clamping body and the third clamping body.

[0016] Further, the upper end surface of the second clamping body is recessed with a positioning step used for corresponding arrangement with the right-angle edge of the shroud of the turbine blade.

[0017] Further, the shape of the end surface of the first clamping body facing the second clamping body is used for corresponding arrangement with the shape of the sawtooth edge of the shroud of the turbine blade; and / or the shape of the end surface of the third clamping body facing the second clamping body is used for corresponding arrangement with the shape of the sawtooth edge of the shroud of the turbine blade.

[0018] The present application has the following beneficial effects:

[0019] The preparation method of the serrated shroud turbine blade protection clamp of the application first processes the parallelepiped-shaped clamp base body according to the shroud contour size of the turbine blade and the preset wall thickness when the clamp clamps the turbine blade, so as to ensure that the clamp base body has sufficient machining allowance for processing, and the parallelepiped-shaped clamp base body has a regular shape and low processing difficulty; then the clamp base body is divided into a clamping end and an assembly end along the vertical direction according to the shroud contour size of the turbine blade, and an assembly hole is processed on the assembly end along the horizontal direction of the assembly end, so that the clamping end of the clamp base body has sufficient machining allowance, and the processing of the assembly hole does not affect the further processing of the clamping end, thereby fully preparing for the subsequent further processing; then the clamp base body is divided into a first clamp body, a second clamp body and a third clamp body along the axial direction of the assembly hole according to the contour size of the serrated edge of the shroud of the turbine blade, the first clamp body, the second clamp body and the third clamp body can be disassembled through the assembly hole and the screw, and the disassembly is convenient; since the assembly hole has been processed before the division, the first clamp body, the second clamp body and the third clamp body have a compact structure after assembly, high reliability, and the processing difficulty is reduced and the assembly accuracy is provided through the block processing; the division of the first clamp body, the second clamp body and the third clamp body is based on the contour size of the serrated edge of the shroud of the turbine blade, so that the surfaces are completely in contact and fit when clamping and protecting the shroud of the turbine blade, and the protection performance is good; finally, the clamping end on the second clamp body is processed according to the shroud contour size of the turbine blade, so that the first clamp body, the second clamp body and the third clamp body form a groove for clamping and protecting the shroud of the turbine blade after assembly, the turbine blade is clamped and fixed by the first clamp body, the second clamp body and the third clamp body, and the shroud of the turbine blade is accommodated in the groove, thereby achieving protection of the shroud of the turbine blade; compared with the prior art, the protection clamp is convenient to clamp, can be repeatedly used, has low protection efficiency and protection cost, the processing difficulty of the protection clamp is reduced and the assembly accuracy of the protection clamp is improved through the block processing, the protection is reliable, the processing quality of the shroud of the turbine blade after protection is guaranteed, the practicality is high, and the protection clamp is suitable for wide promotion and application.

[0020] In addition to the objects, features, and advantages described above, the present application has other objects, features, and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application, and assist in the explanation of the application. In the drawings:

[0022] Figure 1 is a structural schematic diagram of a serrated shroud turbine blade in the prior art;

[0023] Figure 2is a flow chart of a preparation method of the serrated shroud turbine blade protection clamp of the preferred embodiment of the present application.

[0024] Figure 3 is a structural schematic diagram of the serrated shroud turbine blade protection clamp clamping the protection serrated shroud turbine blade of the preferred embodiment of the present application.

[0025] Figure 4 is a structural schematic diagram of the second clamp body clamping the serrated shroud turbine blade in the serrated shroud turbine blade protection clamp of the preferred embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0027] Figure 1 is a structural schematic diagram of the serrated shroud turbine blade in the prior art; Figure 2 is a flow chart of a preparation method of the serrated shroud turbine blade protection clamp of the preferred embodiment of the present application. Figure 3 is a structural schematic diagram of the serrated shroud turbine blade protection clamp clamping the protection serrated shroud turbine blade of the preferred embodiment of the present application. Figure 4 is a structural schematic diagram of the serrated shroud turbine blade protection clamp clamping the protection serrated shroud turbine blade of the preferred embodiment of the present application.

[0028] As Figures 1-4The preparation method of the serrated shroud turbine blade protection clamp includes the following steps: S1, a parallelepiped-shaped clamp base body is processed according to the shroud contour size of the turbine blade and the preset wall thickness when the clamp holds the turbine blade; S2, the clamp base body is divided into a holding end part and an assembly end part along the vertical direction according to the shroud contour size of the turbine blade, and an assembly hole is processed on the assembly end part along the horizontal direction of the assembly end part; S3, the clamp base body is divided into a first clamp part, a second clamp part and a third clamp part along the axial direction of the assembly hole according to the contour size of the serrated edge of the shroud of the turbine blade, and the first clamp part, the second clamp part and the third clamp part can be disassembled through the assembly hole and the screw; and S4, the holding end part on the second clamp part is processed according to the shroud contour size of the turbine blade, so that the first clamp part, the second clamp part and the third clamp part form a groove for holding and protecting the shroud of the turbine blade after being assembled.Specifically, the preparation method of the serrated shroud turbine blade protection clamp of the present application first processes a parallelepiped-shaped clamp base body according to the shroud contour size of the turbine blade and the preset wall thickness when the clamp clamps the turbine blade, so as to ensure that the clamp base body has sufficient machining allowance for processing, and the parallelepiped-shaped clamp base body has a regular shape and low processing difficulty; then, the clamp base body is divided into a clamping end part and an assembly end part along the vertical direction according to the shroud contour size of the turbine blade, and an assembly hole is processed on the assembly end part along the horizontal direction of the assembly end part, so that the clamping end part of the clamp base body has sufficient machining allowance, and the processing of the assembly hole does not affect the further processing of the clamping end part, thereby fully preparing for the subsequent further processing; then, the clamp base body is divided into a first clamp part, a second clamp part and a third clamp part along the axial direction of the assembly hole according to the contour size of the serrated edge of the shroud of the turbine blade, the first clamp part, the second clamp part and the third clamp part can be disassembled through the assembly hole and the screw, and the disassembly is convenient; since the assembly hole has been processed before the division, the structure of the first clamp part, the second clamp part and the third clamp part is compact after assembly, and the reliability is high; the processing difficulty is reduced and the assembly accuracy is provided through the block processing; and the division of the first clamp part, the second clamp part and the third clamp part is based on the contour size of the serrated edge of the shroud of the turbine blade, so that the surfaces of the turbine blade clamped and protected by the first clamp part, the second clamp part and the third clamp part are completely in contact and fit, and the protection performance is good; finally, the clamping end part on the second clamp part is processed according to the shroud contour size of the turbine blade, so that the first clamp part, the second clamp part and the third clamp part form a groove for clamping and protecting the shroud of the turbine blade after assembly, the turbine blade is clamped and fixed by the first clamp part, the second clamp part and the third clamp part, and the shroud of the turbine blade is accommodated in the groove, thereby achieving protection of the shroud of the turbine blade. Compared with the prior art, the protection clamp is convenient to clamp and can be reused, the protection efficiency and protection cost are low, the processing difficulty of the protection clamp is reduced and the assembly accuracy of the protection clamp is improved through the block processing, the protection is reliable, the processing quality of the shroud of the turbine blade after protection is guaranteed, the practicality is strong, and the protection clamp is suitable for wide promotion and application. It should be understood that the protection clamp of the present application is processed by dividing into three parts of the first clamp part, the second clamp part and the third clamp part, so that the end faces between the shroud of the turbine blade clamped by the first clamp part, the second clamp part and the third clamp part are not connected with each other, thereby greatly reducing the processing difficulty. It should be understood that the shroud of the turbine blade has two serrated edges, and the clamp base body is divided into three parts of the first clamp part, the second clamp part and the third clamp part, so that the surfaces are closely fitted when clamping the serrated edges.

[0029] In the embodiment, before the step S1, there is further a step of obtaining the profile size of the turbine blade crown, the profile size of the turbine blade flow passage surface at the turbine blade crown, the profile size of the turbine blade crown sawtooth-shaped edge, and the profile size of the turbine blade crown right-angle edge by profiling the turbine blade. Specifically, the turbine blade is profiled to ensure the profile size of the turbine blade crown, the profile size of the turbine blade flow passage surface at the turbine blade crown, the profile size of the turbine blade crown sawtooth-shaped edge, and the profile size of the turbine blade crown right-angle edge are accurate and reliable, thereby ensuring the clamping reliability of the protective fixture and improving the protection reliability of the protective fixture. Alternatively, in other embodiments, the profile size of the turbine blade crown, the profile size of the turbine blade flow passage surface at the turbine blade crown, the profile size of the turbine blade crown sawtooth-shaped edge, and the profile size of the turbine blade crown right-angle edge are obtained in the design and processing size of the turbine blade.

[0030] In the embodiment, after the step of dividing the fixture base body into the clamping end portion and the assembly end portion along the vertical direction, there is further a step of processing the upper end surface of the clamping end portion according to the profile size of the turbine blade flow passage surface at the turbine blade crown, so that the profile of the upper end surface of the clamping end portion is the same as the profile of the turbine blade flow passage surface at the turbine blade crown. Specifically, by making the profile of the upper end surface of the clamping end portion the same as the profile of the turbine blade flow passage surface at the turbine blade crown, the upper end surface of the clamping end surface of the protective fixture and the turbine blade flow passage surface at the turbine blade crown are in the same curved end surface as possible after the protective fixture clamps the turbine blade, thereby minimizing the clamping gap between them and improving the protection performance of the protective fixture.

[0031] In the embodiment, after the step S4, there is further a step of processing a positioning step for positioning the turbine blade crown on the side wall of the groove according to the profile size of the turbine blade crown right-angle edge. Specifically, the turbine blade crown right-angle edge is positioned by the positioning step, thereby realizing the positioning of the turbine blade crown and improving the assembly accuracy. It should be understood that the turbine blade crown has two right-angle edges, and the positioning step is correspondingly processed with two.

[0032] In the embodiment, the preset wall thickness is 3mm-5mm. It should be understood that the preset wall thickness refers to the thickness of the wall body of the first clamping body, the second clamping body, and the third clamping body that enclose the groove. Specifically, when the preset wall thickness is between 3mm-5mm, the first clamping body, the second clamping body, and the third clamping body are reliable in rigidity and are not easy to deform during clamping, and the material for processing and manufacturing the first clamping body, the second clamping body, and the third clamping body is appropriate and cost-effective; when the preset wall thickness is less than 3mm, the first clamping body, the second clamping body, and the third clamping body lack rigidity and are easy to deform during clamping, thereby affecting the assembly accuracy; when the preset wall thickness is greater than 5mm, the material for processing and manufacturing the first clamping body, the second clamping body, and the third clamping body is excessive, the cost-effectiveness is low, and the self-weight of the first clamping body, the second clamping body, and the third clamping body is large, which is relatively inconvenient to use.

[0033] In the embodiment, the preset gap between the groove and the tooth top of the crown tooth of the shrouded turbine blade after clamping is 1mm-3mm. Specifically, when the preset gap is between 1mm and 3mm, the turbine blade will not be extruded and deformed by the protective clamp during the turbine blade processing due to thermal expansion, and the material of the protective clamp is appropriate and cost-effective; when the preset gap is less than 1mm, the turbine blade is prone to extrusion and deformation by the protective clamp after thermal expansion during the turbine blade processing; when the preset gap is greater than 3mm, the material of the protective clamp is more, the cost-effectiveness is low, and the weight of the protective clamp is large, which is relatively inconvenient to use. It should be understood that the turbine blade and the protective clamp will both withstand high temperature of 200-600°C when the turbine blade is coated with a coating, and will expand due to heat.

[0034] The serrated shroud turbine blade protective clamp in the embodiment is prepared by the preparation method of the serrated shroud turbine blade protective clamp in any of the above embodiments. The protective clamp includes a first clamping body, a second clamping body, and a third clamping body. The first clamping body, the second clamping body, and the third clamping body enclose a groove for clamping and protecting the shroud of the turbine blade. The first clamping body and the second clamping body are detachably connected, and the second clamping body and the third clamping body are detachably connected. Specifically, the first clamping body and the second clamping body are assembled first to assemble the shroud of the turbine blade into the groove, and then the second clamping body and the third clamping body are assembled to achieve clamping and fixing of the shroud of the turbine blade. The serrated shroud turbine blade protective clamp is convenient to disassemble and assemble, effectively improves production efficiency, and ensures processing quality. It should be understood that the use of the protective clamp can achieve sandblasting protection and coating protection requirements for the shroud part of the serrated shroud turbine blade, without the need for protective adhesive tape, and the sandblasting and coating can share a set of clamp, which significantly reduces the workload of the operator before and after coating, is conducive to reducing costs, improving production efficiency, and ensuring processing quality.

[0035] In the embodiment, the protective clamp further includes an assembly hole penetrating through the first clamping body, the second clamping body, and the third clamping body and avoiding the groove, a first screw for connecting the first clamping body and the second clamping body, and a second screw for connecting the second clamping body and the third clamping body. Specifically, the first screw is threadedly connected with the assembly holes on the first clamping body and the second clamping body, respectively, to achieve assembly of the first clamping body and the second clamping body; and the second screw is threadedly connected with the assembly holes on the second clamping body and the third clamping body, respectively, to achieve assembly of the second clamping body and the third clamping body.

[0036] In the embodiment, the upper end surface of the second clamping body is recessed with a positioning step for corresponding arrangement with the right-angle edge of the shroud of the turbine blade. Specifically, the positioning step is used to position the right-angle edge of the shroud of the turbine blade, and then indirectly position the shroud of the turbine blade, thereby improving positioning accuracy and ensuring reliability after clamping and positioning.

[0037] In the embodiment, the shape of the end face of the first clamping body towards the second clamping body is used to correspond to the shape of the shroud sawtooth edge of the turbine blade. Specifically, by fixing the shroud sawtooth edge of the turbine blade through the end face of the first clamping body towards the second clamping body, the two are closely adhered to each other, and the assembly precision is high.

[0038] In the embodiment, the shape of the end face of the third clamping body towards the second clamping body is used to correspond to the shape of the shroud sawtooth edge of the turbine blade. Specifically, by fixing the shroud sawtooth edge of the turbine blade through the end face of the third clamping body towards the second clamping body, the two are closely adhered to each other, and the assembly precision is high.

[0039] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a serrated blade shroud turbine blade protection fixture, characterized in that: The method comprises the following steps: S1, according to the profile size of the turbine blade crown and the preset wall thickness when the clamp clamps the turbine blade, processing a parallelepiped-shaped clamp base; S2, according to the profile size of the turbine blade crown, vertically dividing the clamp base into a clamping end and an assembly end, and processing an assembly hole on the assembly end along the horizontal direction of the assembly end; S3, according to the profile size of the turbine blade crown sawtooth edge, dividing the clamp base into a first clamp body, a second clamp body and a third clamp body along the axial direction of the assembly hole, and the first clamp body, the second clamp body and the third clamp body can be disassembled through the assembly hole and the screw; S4, according to the profile size of the turbine blade crown, processing the clamping end on the second clamp body, so that the first clamp body, the second clamp body and the third clamp body form a groove for clamping and protecting the turbine blade crown after assembly.

2. The method of making a serrated shroud turbine blade guard clamp of claim 1, wherein, Before step S1, the method further comprises the following steps: Through profiling processing of the turbine blade, the profile size of the turbine blade crown, the profile size of the flow passage surface at the turbine blade crown, the profile size of the turbine blade crown sawtooth edge, and the profile size of the turbine blade crown right angle edge are obtained.

3. The method of making a serrated shroud turbine blade guard clamp of claim 2, wherein, After the step of vertically dividing the clamp base into a clamping end and an assembly end, the method further comprises the following steps: According to the profile size of the flow passage surface at the turbine blade crown, processing the upper end surface of the clamping end, so that the profile of the upper end surface of the clamping end is the same as the profile of the flow passage surface at the turbine blade crown.

4. The method of making a serrated shroud turbine blade guard clamp of claim 2, wherein, After step S4, the method further comprises the following steps: According to the profile size of the turbine blade crown right angle edge, processing a positioning step on the side wall of the groove for positioning the turbine blade crown.

5. The method of making a serrated shroud turbine blade guard clamp according to any one of claims 1-4, wherein, The preset wall thickness is 3-5 mm.

6. The method of making a serrated shroud turbine blade guard clamp according to any one of claims 1-4, wherein, The preset gap between the groove and the crown tooth tip of the clamped turbine blade crown is 1-3 mm.

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