A machining tool and milling machine for double reheat supercritical steam turbine blades

Abstract

The present invention provides a processing tool and milling machine for secondary reheat supercritical steam turbine blades, comprising: a base plate; an end face pressing piece, which is arranged on the base plate and connected to the base plate; a bottom flat washer, which is arranged between a blade blank and the base plate and is used to position the blade blank, and the bottom flat washer is connected to the base plate; a baffle, which is arranged on the base plate and is connected to the base plate and is used to position the blade blank in the length direction; a positioning component, which is arranged on one side of the bottom flat washer and is connected to the base plate and is used to position the blade blank in the width direction; a side pressing component, which is arranged on the other side of the bottom flat washer and is connected to the base plate, and the side pressing component is arranged corresponding to the positioning block to press the two ends of the blade blank; the problems of inaccurate positioning, unreliable clamping, inconvenient operation and low processing accuracy of the existing tooling are solved, thereby improving the processing quality and production efficiency of the blades and meeting the needs of the power industry for high-efficiency power generation equipment.

Description

Technical Field

[0001] The invention relates to the technical field of parts milling, and in particular to a processing tool and a milling machine for secondary reheat supercritical steam turbine blades. Background Art

[0002] In the power industry, the performance and reliability of the double reheat supercritical steam turbine, as an important component of high-efficiency power generation equipment, directly affect the efficiency and stability of the entire power generation system. As a key component inside the steam turbine, the turbine blades have extremely high processing accuracy and quality requirements. The blades must not only withstand the impact and corrosion of high-temperature and high-pressure steam, but also ensure sufficient strength and durability under high-speed rotation. Therefore, the design of blade processing tooling is of great significance to ensure blade processing accuracy, improve production efficiency and reduce production costs.

[0003] Traditional steam turbine blade processing tools often have problems such as inaccurate positioning and unreliable clamping, which can easily cause the blades to deform or shift during processing, thus affecting the final quality and performance of the blades. Especially in the processing of double reheat supercritical steam turbine blades, due to the large size, complex shape and high material strength of the blades, higher requirements are placed on the positioning accuracy and clamping force of the tooling.

[0004] Existing tooling designs often use simple plane positioning and clamping methods, which are difficult to effectively adapt to the complex three-dimensional shape and size changes of the blades. At the same time, the tooling structure is relatively bulky and inconvenient to operate, which is not conducive to improving production efficiency. In addition, some tooling lacks sufficient rigidity and stability, and is prone to vibration during processing, further affecting the processing accuracy of the blades.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above content has been disclosed before the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a processing tool and milling machine for secondary reheat supercritical steam turbine blades to solve the problems of inaccurate positioning, unreliable clamping, inconvenient operation and low processing precision of existing tooling, thereby improving the processing quality and production efficiency of the blades and meeting the power industry's demand for high-efficiency power generation equipment.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] The present invention provides a processing tool for a double reheat supercritical steam turbine blade, comprising:

[0009] Base plate;

[0010] An end face pressing member is arranged on the bottom plate and connected to the bottom plate;

[0011] A bottom flat washer block is disposed between the blade blank and the bottom plate and is used to position the blade blank, wherein the bottom flat washer block is connected to the bottom plate;

[0012] A baffle, disposed on the bottom plate and connected to the bottom plate, for positioning the blade blank in the length direction;

[0013] A positioning assembly, arranged on one side of the bottom flat pad and connected to the bottom plate, for positioning the blade blank in the width direction;

[0014] The side clamping assembly is arranged on the other side of the bottom flat pad and connected to the bottom plate. The side clamping assembly is arranged corresponding to the positioning block to press the two ends of the blade blank.

[0015] The present invention proposes a processing tool and milling machine for double reheat supercritical steam turbine blades to solve the problems of inaccurate positioning, unreliable clamping, inconvenient operation and low processing accuracy of existing tooling, thereby improving the processing quality and production efficiency of the blades and meeting the needs of the power industry for high-efficiency power generation equipment.

[0016] As a preferred technical solution, the positioning assembly includes: a positioning block, a cushion block is further provided between the chamfered surface on one side of the positioning block and the side surface of the blade blank, and the cushion block is connected to the positioning block.

[0017] As a preferred technical solution, the side clamping assembly includes: an auxiliary block and a clamping block, one end face of the auxiliary block is connected to the base plate, one side face of the auxiliary block is connected to the clamping block, and a side clamping hole is provided on the clamping block.

[0018] As a preferred technical solution, the side clamping assembly includes: a first stud, one end of which is inserted into the base plate and connected thereto, and the other end of the first stud passes through the side clamping hole and through a first nut to achieve clamping of the side of the blade blank.

[0019] As an optimal technical solution, the end face clamping part includes: a pressure plate and a connecting block, one side of the pressure plate has a step surface that contacts the back arc surface of the blade steam duct, the other side of the pressure plate is connected to the connecting block, one end face of the connecting block is connected to the bottom plate, and an end face clamping hole is also opened on the pressure plate.

[0020] As a preferred technical solution, the end face clamping member includes: a second stud, one end of which is inserted into the base plate and connected thereto, and the other end of the second stud passes through the end face clamping hole and through a second nut to achieve clamping of the end face of the blade blank.

[0021] The present invention also provides a milling machine, comprising: a processing tool and a main shaft for secondary reheat supercritical steam turbine blades as described in any of the above items, wherein a blade blank is installed on the processing tool for the secondary reheat supercritical steam turbine blades, a tool is connected to the main shaft, and the tool is arranged corresponding to the blade blank. The processing tool for the secondary reheat supercritical steam turbine blades is installed on the working platform of the milling machine, and milling is performed on the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile and the blade opening.

[0022] As a preferred technical solution, the blade steam inlet and outlet sides, the blade assembly inner arc, the blade profile and the blade opening are milled, which specifically includes the following processing steps:

[0023] Import the required blade 3D model into the CAM software; use the tool path generation function of the CAM software to generate tool path data according to the planned strategy and transmit it to the controller of the CNC five-axis milling machine.

[0024] The controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the steam inlet and outlet sides of the blade, and performs milling on the steam inlet and outlet sides of the blade;

[0025] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the inner arc of the blade assembly, and performs milling processing on the inner arc of the blade assembly;

[0026] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the blade profile, and performs milling processing on the blade profile;

[0027] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy, controls the spindle to drive the tool to run along the path of the blade opening, and performs milling processing on the blade opening.

[0028] As a preferred technical solution, the following steps are also included: the processing tooling of the secondary reheat supercritical steam turbine blades is installed on the working platform of the milling machine, and then the radial surface is milled.

[0029] As a preferred technical solution, the processing tooling of the secondary reheat supercritical steam turbine blade is installed on the working platform of the milling machine, and then the radial surface milling is performed, which specifically includes the following steps:

[0030] Start the vertical milling machine, adjust the distance between the spindle and the working platform of the milling machine, make the tip of the milling cutter gently touch the surface of the workpiece, and perform the tool setting operation;

[0031] Turn the spindle up and start milling.

[0032] The device and engraving machine for processing steam turbine rotor blades provided by the present invention have the following beneficial effects:

[0033] 1) The present invention proposes a processing tool and milling machine for double reheat supercritical steam turbine blades to solve the problems of inaccurate positioning, unreliable clamping, inconvenient operation and low processing accuracy of existing tooling, thereby improving the processing quality and production efficiency of the blades and meeting the needs of the power industry for high-efficiency power generation equipment;

[0034] 2) Through the combined action of the bottom flat pad, positioning assembly, baffle and end face clamp, the blade blank is accurately positioned in three-dimensional space, which helps to ensure the stability and consistency of the blade during processing;

[0035] The side clamping assembly ensures that the blade blank will not be displaced or deformed during processing through adjustable clamping force and stable clamping method. At the same time, the precise control of the clamping force helps to avoid unnecessary damage to the blade.

[0036] The introduction of modular design and quick clamping device simplifies the operation process and improves production efficiency, which helps to reduce the difficulty of operation and labor costs and improve the convenience of tooling use;

[0037] The application of high-precision processing equipment and online monitoring and feedback systems ensures the manufacturing accuracy and processing accuracy of tooling, which helps to improve the processing quality and production efficiency of blades and meet the power industry's demand for efficient power generation equipment.

[0038] 3) The blade steam inlet and outlet side, blade assembly inner arc, blade profile and blade opening are milled by a CNC five-axis milling machine, so that the surface roughness of the blade steam inlet and outlet side, blade assembly inner arc, blade profile and blade opening fully meets the standard. After the blade steam inlet and outlet side, blade assembly inner arc, blade profile and blade opening are processed, the blade blank is fixed by a tool, and the tool and the blade blank are fixed on the working platform of the milling machine, and then the radial surface is processed, which can ensure the size, shape and position tolerance, surface roughness of the workpiece during processing, ensure the processing accuracy of the workpiece, and reduce the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a processing tool for a double reheat supercritical steam turbine blade provided by the present invention;

[0040] Figure 2A schematic diagram of the structure of a blade blank provided by the present invention;

[0041] Figure 3 A schematic structural diagram of a milling machine provided by the present invention;

[0042] Among them, 1-bottom plate; 2-end face clamping piece; 21-pressing plate; 211-step surface; 22-connecting block; 23-second stud; 24-second nut; 25-end face clamping hole; 3-bottom flat washer; 4-positioning assembly; 41-positioning block; 42-pad; 5-side clamping assembly; 51-auxiliary block; 52-pressing block; 53-side clamping hole; 54-first stud; 55-first nut; 6-baffle; 7-blade blank; 8-spindle; 9-working platform of milling machine; 10-tailstock. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] like Figure 1-2 As shown, the present invention provides a processing tool for a double reheat supercritical steam turbine blade, comprising:

[0045] Bottom plate 1;

[0046] An end surface pressing member 2 is arranged on the bottom plate 1 and connected to the bottom plate 1;

[0047] A bottom flat washer 3 is disposed between the blade blank 7 and the bottom plate 1 and is used to position the blade blank 7. The bottom flat washer 3 is connected to the bottom plate 1.

[0048] A baffle 6, disposed on the bottom plate 1 and connected to the bottom plate 1, for positioning the blade blank 7 in the length direction;

[0049] A positioning assembly 4, which is arranged on one side of the bottom flat pad 3 and connected to the bottom plate 1, and is used to position the blade blank 7 in the width direction;

[0050] The side clamping assembly 5 is arranged on the other side of the bottom flat pad 3 and connected to the bottom plate 1 . The side clamping assembly 5 is arranged corresponding to the positioning block 41 to press the two ends of the blade blank 7 .

[0051] The present invention proposes a processing tool and milling machine for double reheat supercritical steam turbine blades to solve the problems of inaccurate positioning, unreliable clamping, inconvenient operation and low processing accuracy of existing tooling, thereby improving the processing quality and production efficiency of the blades and meeting the needs of the power industry for high-efficiency power generation equipment.

[0052] Preferably, the positioning assembly 4 comprises: a positioning block 41, a cushion block 42 is provided between the chamfered surface on one side of the positioning block 41 and the side surface of the blade blank 7, and the cushion block 42 is connected to the positioning block 41;

[0053] The design of the spacer block 42 allows for fine adjustment of the gap between the positioning block 41 and the blade blank 7. Since the blade blank 7 may have slight size differences or shape deviations, the spacer block 42 can compensate for these differences to ensure that the blade blank 7 can be accurately matched and positioned at a predetermined position.

[0054] The pad 42 serves as a buffer layer between the positioning block 41 and the blade blank 7, which can prevent the positioning block 41 from directly pressing or scratching the surface of the blade blank 7, and is essential for protecting the expensive and precise blade blank 7, especially in the high-precision machining process;

[0055] During the positioning process, the cushion block 42 can disperse the pressure exerted by the positioning block 41 on the blade blank 7, reducing the stress concentration phenomenon, which helps to prevent the blade blank 7 from being deformed or damaged due to excessive local pressure;

[0056] The presence of the spacer block 42 increases the contact area between the positioning block 41 and the blade blank 7 and improves the positioning stability, which helps prevent the blade blank 7 from being displaced due to vibration or external force during processing, thereby ensuring the continuity and accuracy of processing.

[0057] Preferably, the side clamping assembly 5 comprises: an auxiliary block 51 and a clamping block 52, one end face of the auxiliary block 51 is connected to the bottom plate 1, one side face of the auxiliary block 51 is connected to the clamping block 52, and a side clamping hole 53 is formed on the clamping block 52;

[0058] Preferably, the side pressing assembly 5 comprises: a first stud 54, one end of which is inserted into the bottom plate 1 and connected thereto, and the other end of which passes through the side pressing hole 53 and passes through a first nut 55 to achieve pressing of the side surface of the blade blank 7;

[0059] One end of the first stud 54 is connected to the bottom plate 1, and the other end passes through the side clamping hole 53 and is fastened by the first nut 55, thereby forming a stable clamping structure. This design can ensure that the blade blank 7 is subjected to a uniform and stable clamping force during the processing, thereby preventing it from displacement or deformation;

[0060] By adjusting the position of the first nut 55 on the first stud 54, the pressing force of the pressing block 52 on the blade blank 7 can be conveniently adjusted. This adjustment function enables the tooling to adapt to blade blanks 7 of different sizes, shapes and materials, thereby improving the versatility and flexibility of the tooling.

[0061] The first stud 54 and the first nut 55 are used as connecting parts, which not only realize the clamping function, but also enhance the structural strength of the side clamping assembly 5, which helps to prevent the tooling from being deformed or damaged due to excessive pressure during the clamping process, thereby ensuring the stability and durability of the tooling;

[0062] The clamping operation is performed by using the first stud 54 and the first nut 55. Compared with other complex clamping mechanisms, the operation is simpler and faster, which helps to improve processing efficiency, reduce operation time, and reduce operation difficulty;

[0063] The stable pressing effect and the adjustable pressing force enable the blade blank 7 to maintain a stable posture and position during the processing, thereby ensuring the processing accuracy and processing quality.

[0064] Preferably, the end face pressing member 2 comprises: a pressing plate 21 and a connecting block 22, one side of the pressing plate 21 has a step surface 211 in contact with the back arc surface of the blade steam channel, the other side of the pressing plate 21 is connected to the connecting block 22, one end face of the connecting block 22 is connected to the bottom plate 1, and the pressing plate 21 is also provided with an end face pressing hole 25;

[0065] Preferably, the end face pressing member 2 comprises: a second stud 23, one end of which is inserted into the bottom plate 1 and connected thereto, and the other end of which passes through the end face pressing hole 25 and passes through a second nut 24 to achieve pressing of the end face of the blade blank 7;

[0066] The step surface 211 on one side of the pressing plate 21 is designed to be in close contact with the back arc surface of the blade steam channel. This contact mode not only ensures the accurate positioning of the blade blank 7 on the end surface, but also prevents it from displacement or deformation during the processing through the pressing effect of the pressing plate 21; the pressing plate 21 is connected to the bottom plate 1 through the connecting block 22 to form a stable supporting structure, which helps to enhance the overall stability of the blade blank during the processing and reduce the error caused by vibration or external force;

[0067] The design of the end face pressing hole 25 enables the end face pressing member 2 (such as the second stud and the second nut) to pass through and realize the pressing of the end face of the blade blank 7; at the same time, by adjusting the position of the second nut 24, the size of the pressing force can be conveniently adjusted to adapt to blade blanks 7 of different sizes, shapes and materials;

[0068] One end of the second stud 23 is inserted into the bottom plate 1 and firmly connected thereto, and the other end passes through the end face pressing hole 25 and is fastened by the second nut 24. This design enables the end face pressing member 2 to effectively press the end face of the blade blank 7, ensuring its stability during processing.

[0069] In addition to the pressing effect, the second stud 23 and the second nut 24 also provide additional support for the blade blank 7. This support effect helps to reduce the deformation of the blade caused by gravity or external force during the processing, and further improves the processing accuracy;

[0070] The design of the second stud 23 and the second nut 24 makes the end face clamping member 2 easy to install and disassemble, which helps the operator to quickly adjust the size and position of the clamping force according to processing requirements, thereby improving work efficiency.

[0071] The present invention also provides a milling machine, comprising: a processing tool and a main shaft 8 for secondary reheat supercritical steam turbine blades as described in any of the above items, wherein a blade blank 7 is installed on the processing tool for secondary reheat supercritical steam turbine blades, and a tool is provided on the main shaft 8, and the tool is arranged corresponding to the blade blank 7. The processing tool for secondary reheat supercritical steam turbine blades is installed on a working platform 9 of the milling machine, and milling is performed on the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile and the blade opening.

[0072] The present invention further provides a milling machine, further comprising: a tailstock 10 , wherein the tailstock 10 is used for further positioning the blade blank 7 .

[0073] The present invention also provides a milling machine, which uses a CNC five-axis milling machine to mill the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile, and the blade opening, so that the surface roughness of the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile, and the blade opening completely meets the standards. After the processing of the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile, and the blade opening is completed, the blade blank is fixed by a tool, and the tool and the blade blank are fixed on the working platform of the milling machine, and then the radial surface is processed, which can ensure the size, shape and position tolerance, and surface roughness of the workpiece during processing, ensure the processing accuracy of the workpiece, and reduce the processing cost.

[0074] Preferably, the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile and the blade opening are milled, which specifically includes the following processing steps:

[0075] Import the required blade 3D model into the CAM software; use the tool path generation function of the CAM software to generate tool path data according to the planned strategy and transmit it to the controller of the CNC five-axis milling machine.

[0076] The controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the steam inlet and outlet sides of the blade, and performs milling on the steam inlet and outlet sides of the blade;

[0077] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the inner arc of the blade assembly, and performs milling processing on the inner arc of the blade assembly;

[0078] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the blade profile, and performs milling processing on the blade profile;

[0079] And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy, controls the spindle to drive the tool to run along the path of the blade opening, and performs milling processing on the blade opening.

[0080] By using the tool path generation function of CAM software (computer-aided manufacturing software), the tool path can be accurately planned according to the three-dimensional model of the blade to ensure the processing accuracy. The high-precision control system of the CNC five-axis milling machine can accurately execute the tool path and realize the precise milling of various parts of the blade;

[0081] Milling processing itself is highly efficient and suitable for mass production. The multi-axis linkage capability of the CNC five-axis milling machine enables the tool to move freely in three-dimensional space, reducing the number of tool changes and processing time. CAM software can optimize the tool path and further shorten the processing cycle;

[0082] The five-axis linkage capability of the CNC five-axis milling machine enables it to process complex geometric shapes, such as the steam inlet and outlet sides of the blades, the inner arc of the assembly, the profile and the opening; by adjusting the tool path and processing strategy, it can adapt to the processing needs of blades of different shapes and sizes.

[0083] Accurate tool path planning and five-axis linkage control ensure the processing quality of each part of the blade. Milling can obtain a higher surface finish, meet the blade's surface quality requirements, and ensure processing quality;

[0084] The combined use of CNC five-axis milling machines and CAM software reduces the dependence and errors of manual operations, reduces labor costs, and high-precision processing reduces scrap and rework rates, reduces material costs, and reduces processing costs;

[0085] The CAM software has a collision detection function, which can avoid collisions between the tool and the workpiece, ensuring the safety of the machining process. The control system of the CNC five-axis milling machine can monitor the tool position and machining status in real time, further ensuring machining safety and improving machining safety.

[0086] Preferably, the following steps are also included: the processing tooling of the secondary reheat supercritical steam turbine blade is installed on the working platform of the milling machine, and then the radial surface is milled;

[0087] Installing the processing tooling firmly on the work platform can ensure the stability and position accuracy of the blade during the processing; the milling of the radial surface requires high-precision control and positioning, which can be achieved through the cooperation of the tooling and the platform, ensuring that the processing accuracy of the blade meets the design requirements;

[0088] The stability and rigidity of the work platform help reduce vibration and deviation during machining, thereby improving machining efficiency and quality.

[0089] Preferably, the processing tooling of the secondary reheat supercritical steam turbine blade is installed on the working platform of the milling machine, and then the radial surface milling is performed, which specifically includes the following steps:

[0090] Start the vertical milling machine, adjust the distance between the spindle and the working platform of the milling machine, make the tip of the milling cutter gently touch the surface of the workpiece, and perform the tool setting operation;

[0091] Rotate the spindle and start milling;

[0092] The accurate position of the tool in the machine tool coordinate system is determined by the slight contact between the milling cutter tip and the workpiece surface, providing a reference for subsequent processing; the accuracy of the tool setting operation is directly related to the accuracy of subsequent processing, ensuring that the shape, size and position of the blade meet the design requirements; accurate tool setting can prevent the tool from colliding with the workpiece or other parts during processing, protecting the machine tool and workpiece from damage;

[0093] Tool setting and milling play a vital role in the machining of secondary reheat supercritical steam turbine blades. They not only ensure the machining accuracy and surface quality, but also improve the machining efficiency and safety, providing a strong guarantee for the manufacture of high-quality steam turbine blades.

[0094] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all various changes or equivalent substitutions falling within the scope of the claims of the present application are included. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope protected by the present invention.

Claims

1. A tooling for processing double reheat supercritical steam turbine blades, characterized in that: include: Base plate; An end face pressing member is arranged on the bottom plate and connected to the bottom plate; A bottom flat washer block is disposed between the blade blank and the bottom plate and is used to position the blade blank, wherein the bottom flat washer block is connected to the bottom plate; A baffle, disposed on the bottom plate and connected to the bottom plate, for positioning the blade blank in the length direction; A positioning assembly, arranged on one side of the bottom flat pad and connected to the bottom plate, for positioning the blade blank in the width direction; The side clamping assembly is arranged on the other side of the bottom flat pad and connected to the bottom plate. The side clamping assembly is arranged corresponding to the positioning block to press the two ends of the blade blank.

2. The processing tooling for double reheat supercritical steam turbine blades according to claim 1 is characterized in that: The positioning assembly comprises a positioning block, a cushion block is provided between the angled surface on one side of the positioning block and the side surface of the blade blank, and the cushion block is connected to the positioning block.

3. The processing tooling for double reheat supercritical steam turbine blades according to claim 1, characterized in that: The side clamping assembly comprises: an auxiliary block and a clamping block, one end surface of the auxiliary block is connected to the bottom plate, one side surface of the auxiliary block is connected to the clamping block, and a side clamping hole is opened on the clamping block.

4. The processing tooling for double reheat supercritical steam turbine blades according to claim 3 is characterized in that: The side clamping assembly includes: a first stud, one end of which is inserted into the base plate and connected thereto, and the other end of which passes through the side clamping hole and through a first nut to achieve clamping of the side of the blade blank.

5. The processing tooling for double reheat supercritical steam turbine blades according to claim 1, characterized in that: The end face clamping member includes: a pressing plate and a connecting block. One side of the pressing plate has a step surface that contacts the back arc surface of the blade steam channel. The other side of the pressing plate is connected to the connecting block. One end face of the connecting block is connected to the bottom plate. The pressing plate is also provided with an end face clamping hole.

6. The processing tooling for double reheat supercritical steam turbine blades according to claim 5, characterized in that: The end face pressing member includes: a second stud, one end of which is inserted into the base plate and connected thereto, and the other end of which passes through the end face pressing hole and through a second nut to achieve pressing of the end face of the blade blank.

7. A milling machine, characterized in that: include: The processing tooling and spindle of a double reheat supercritical steam turbine blade as described in any one of claims 1 to 6, wherein a blade blank is installed on the processing tooling of the double reheat supercritical steam turbine blade, a tool is connected to the spindle, and the tool is arranged corresponding to the blade blank. The processing tooling of the double reheat supercritical steam turbine blade is installed on the working platform of a milling machine, and milling is performed on the steam inlet and outlet sides of the blade, the inner arc of the blade assembly, the blade profile and the blade opening.

8. The milling machine according to claim 7, characterized in that Milling is performed on the steam inlet and outlet sides of the blades, the inner arc of the blade assembly, the blade profile and the blade opening, which specifically includes the following processing steps: Import the required blade 3D model into the CAM software; use the tool path generation function of the CAM software to generate tool path data according to the planned strategy and transmit it to the controller of the CNC five-axis milling machine. The controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the steam inlet and outlet sides of the blade, and performs milling on the steam inlet and outlet sides of the blade; And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the inner arc of the blade assembly, and performs milling processing on the inner arc of the blade assembly; And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy to control the spindle to drive the tool to run along the path of the blade profile, and performs milling processing on the blade profile; And / or, the controller of the CNC five-axis milling machine generates a tool path according to the planned strategy, controls the spindle to drive the tool to run along the path of the blade opening, and performs milling processing on the blade opening.

9. The milling machine according to claim 7 or 8, characterized in that: The following steps are also included: The processing tooling of the secondary reheat supercritical steam turbine blade is installed on the working platform of the milling machine, and then the radial surface is milled.

10. The milling machine according to claim 9, characterized in that The processing tooling of the secondary reheat supercritical steam turbine blade is installed on the working platform of the milling machine, and then the radial surface is milled, which specifically includes the following steps: Start the vertical milling machine, adjust the distance between the spindle and the working platform of the milling machine, make the tip of the milling cutter gently touch the surface of the workpiece, and perform the tool setting operation; Turn the spindle up and start milling.

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