Secondary alignment process method for milling groove of rotating shaft of large water-hydrogen cooled generator

Abstract

The invention discloses a secondary alignment process method for a milling groove of a rotating shaft of a large water-hydrogen-cooled generator, and belongs to the technical field of turbine generator rotor machining. The problems of low production efficiency, high cost and unstable quality in the prior art are solved. According to the technical key points, a steam end inner oil baffle platform and an excitation end inner oil baffle platform which are subjected to finish machining of the rotating shaft of the large-scale water-hydrogen-cooled generator are used as references for aligning the parallelism and the height of the rotating shaft and a rotor milling machine, the rotating shaft is aligned again after rotating by 180 degrees, and then the rotating shaft is corrected again by taking the side wall of a body lower wire groove subjected to finish machining as a reference. According to the invention, operations such as frequent tool changing and repositioning caused by equipment stroke limitation are avoided, so that the machining process is more continuous and efficient; on the premise that equipment is not transformed, machining tasks can be completed through existing equipment, a large amount of equipment transformation funds are saved, the machining precision of the rotating shaft is guaranteed, the production efficiency of the rotating shaft is improved, the product quality is guaranteed, and working hours are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of the processing of turbogenerator rotors, and particularly to a secondary alignment process method for milling grooves on the rotating shaft of a large water-hydrogen-cooled generator. Background Art

[0002] As the core component of a generator, the rotating shaft of a large water-hydrogen-cooled generator needs to have sufficient stiffness and strength to meet the requirements of high-load operation. With the increase in the unit capacity, the diameter size and axial length of the rotating shaft increase accordingly, resulting in an increase in the structural sizes of shaft platforms, lead grooves, body grooves, etc. Correspondingly, each shaft platform, lead groove, body groove, etc. will be enlarged and lengthened accordingly. To ensure the machining accuracy, the rotating shaft needs to be machined.

[0003] The existing processing of rotating shafts usually adopts high-precision rotor milling machines and numerical control processing. High-precision rotor milling machines have high machining accuracy; good surface quality, which can reduce the surface roughness of machining; high processing efficiency, and can complete multiple processes in one clamping; can machine complex shapes to meet special requirements.

[0004] At the same time, the processing by high-precision rotor milling machines also has many limitations. The equipment cost is high, and the procurement and supporting costs are large; the requirements for operators are high; the equipment maintenance is complex, and the maintenance cost is high; with the further increase in the size of the rotating shaft, the machining stroke of the rotor milling machine is limited, and it cannot meet the machining requirements of ultra-long or extra-large diameter rotating shafts. If the existing equipment is modified or new equipment is purchased, the production cost will increase significantly, and the cycle will be long, affecting the production efficiency.

[0005] Therefore, it is urgent to propose a secondary alignment process method for milling grooves on the rotating shaft of a large water-hydrogen-cooled generator to solve the problems of low production efficiency, high cost, and unstable quality in the existing technology. Summary of the Invention

[0006] In view of the above facts, in order to solve the problems of low production efficiency, high cost, and unstable quality in the existing technology, the present invention designs a secondary alignment process method for milling grooves on the rotating shaft of a large water-hydrogen-cooled generator.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A secondary alignment process method for milling grooves on the rotating shaft of a large water-hydrogen-cooled generator, characterized by comprising the following steps:

[0009] S1: Clean the workbench surface. The crane places the rotating shaft on the supporting bearing pads of the rotor milling machine. Install a dial indicator on the milling cutter bar of the milling machine, and the tip of the dial indicator is flush with the head of the milling cutter bar. Use the dial indicator to measure the spatial positions of the main shaft platforms of the rotating shaft and relative to the rotor milling machine;

[0010] S2: Install an excitation end encoder flange at the excitation end of the rotating shaft, and mate the other side with the encoder of the rotor milling machine;

[0011] S3: Clamp the excitation end of the rotating shaft on the workbench or fixture of the rotor milling machine;

[0012] S4: Align the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft with respect to the height of the rotor milling machine, so that the rotor milling machine and the rotating shaft have the same coordinate in the height direction. Align the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft with respect to the parallelism of the rotor milling machine, so that the rotor milling machine and the rotating shaft have the same coordinate in the parallel direction;

[0013] S5: Clamp the rotating shaft;

[0014] S6: Rotate the machine spindle of the rotor milling machine to align the nesting hole on the rotating shaft with the milling cutter bar, and set the first machining zero point;

[0015] S7: Rotate the machine spindle of the rotor milling machine counterclockwise by an angle, and set and mark the second machining zero point;

[0016] S8: Machine the body undercut groove, dovetail groove, damping groove and the groove on the steam end shaft table of the rotating shaft;

[0017] S9: Remove the clamping of the rotating shaft;

[0018] S10: Use a crane to lift the rotating shaft and rotate it 180°, and place the rotating shaft back on the support bearing pads of the rotor milling machine;

[0019] S11: Install a steam end encoder flange at the steam end of the rotating shaft, and mate the other side with the encoder of the rotor milling machine;

[0020] S12: Clamp the steam end of the rotating shaft on the workbench or fixture of the rotor milling machine;

[0021] S13: Align the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft with respect to the height of the rotor milling machine, so that the rotor milling machine and the rotating shaft have the same coordinate in the height direction. Align the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft with respect to the parallelism of the rotor milling machine, so that the rotor milling machine and the rotating shaft have the same coordinate in the parallel direction;

[0022] S14: Rotate the machine spindle of the rotor milling machine to align the body undercut groove of the rotating shaft with the milling cutter bar, align the concentricity of the rotating shaft and the rotor milling machine, and set the third machining zero point;

[0023] S15: Clamp the rotating shaft;

[0024] S16: Machine the groove and hole on the excitation end shaft table of the rotating shaft to complete all machining of the rotating shaft on the rotor milling machine.

[0025] Further: In S4, extend the milling machine tool rod to the leftmost and uppermost positions of the outer circle of the inner oil baffle at the excitation end, record the vertical coordinate of the rotor milling machine at this time, move along the axial direction across the inner oil baffle at the excitation end, and observe the changing value of the dial indicator;

[0026] Set the maximum value of the dial indicator to 0, keep the vertical coordinate of the rotor milling machine unchanged, extend the milling machine tool rod to the leftmost position of the outer circle of the inner oil baffle at the steam end, move along the axial direction across the inner oil baffle at the steam end until the changing value of the dial indicator does not exceed 0.03 mm; otherwise, adjust the vertical position of the rotor milling machine.

[0027] Further: In S4, extend the milling machine tool rod to the innermost position in the horizontal direction of the outer circle of the inner oil baffle at the steam end relative to the rotor milling machine until the dial indicator just touches the inner oil baffle at the steam end of the rotating shaft, move along the axial direction across the inner oil baffle at the steam end, and observe the changing value of the dial indicator;

[0028] Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling machine tool rod at this time, keep the parallel coordinate of the rotor milling machine relative to the rotating shaft unchanged, move the axial position of the rotor milling machine, extend the milling machine tool rod to the innermost position in the horizontal direction of the outer circle of the inner oil baffle at the excitation end relative to the rotor milling machine, input the coordinate value in the extending direction of the milling machine tool rod on the machine tool, move along the axial direction across the inner oil baffle at the excitation end, observe the changing value of the dial indicator at this time, and adjust the position of the corresponding static pressure pad of the rotor milling machine until the changing value of the dial indicator does not exceed 0.03 mm.

[0029] Further: In S6, the first machining zero point is at the exact center of the nesting hole.

[0030] Further: In S7, the second machining zero point is the polar center line of the rotating shaft, which is the reference for machining the rotating shaft and the steam end.

[0031] Further: In S8, the lower wire groove of the main body is the reference for aligning the rotor milling machine with the rotating shaft coaxially.

[0032] Further: In S13, extend the milling machine tool rod to the leftmost and uppermost positions of the outer circle of the inner oil baffle at the excitation end, record the vertical coordinate of the rotor milling machine at this time, move along the axial direction across the inner oil baffle at the excitation end, and observe the changing value of the dial indicator;

[0033] Set the maximum value of the dial indicator to 0, keep the vertical coordinate of the rotor milling machine unchanged, extend the milling machine tool rod to the leftmost position of the outer circle of the inner oil baffle at the steam end, move along the axial direction across the inner oil baffle at the steam end until the changing value of the dial indicator does not exceed 0.03 mm; otherwise, adjust the vertical position of the rotor milling machine.

[0034] Further: In S13, extend the milling machine tool rod to the innermost side in the horizontal direction of the rotor milling machine with respect to the outer circle of the oil baffle at the steam end until the dial indicator just touches the oil baffle at the steam end of the rotating shaft. Then, draw along the axial direction across the oil baffle at the steam end and observe the changed value of the dial indicator.

[0035] Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling machine tool rod at this time, keep the parallel coordinates of the rotor milling machine with respect to the rotating shaft unchanged, move the axial position of the rotor milling machine, extend the milling machine tool rod to the innermost side in the horizontal direction of the rotor milling machine with respect to the outer circle of the oil baffle at the exciter end, input the coordinate value in the extending direction of the milling machine tool rod on the machine tool, draw along the axial direction across the oil baffle at the exciter end, observe the changed value of the dial indicator at this time, and adjust the position of the corresponding static pressure pad of the rotor milling machine until the changed value of the dial indicator does not exceed 0.03 mm.

[0036] Further: In S14, extend the milling machine tool rod to the side wall of the processed lower wire groove of the body, draw along the axial direction across the side wall of the lower wire groove of the body, and observe the changed value of the dial indicator. Adjust the position of the corresponding static pressure pad of the rotor milling machine until the changed value of the dial indicator does not exceed 0.03 mm.

[0037] Further: In S14, the third machining zero point is the machining zero point for the exciter end of the rotating shaft.

[0038] The beneficial effects of the present invention are as follows:

[0039] 1. The present invention effectively reduces the positioning error, improves the relative accuracy between the milling groove position and the shaft table as well as other parts of the rotating shaft, ensures that the position accuracy and dimensional accuracy of the milling groove meet the design requirements, and thus guarantees the overall machining accuracy of the rotating shaft.

[0040] 2. The present invention can complete as many machining tasks as possible in one clamping, avoiding operations such as frequent tool changing and repositioning caused by the equipment stroke limitation, and making the machining process more continuous and efficient.

[0041] 3. The present invention can complete the machining tasks by using the existing equipment without modifying the equipment, saving a large amount of equipment modification funds, ensuring the machining accuracy of the rotating shaft, improving the production efficiency of the rotating shaft, guaranteeing the product quality, and saving working hours. Description of the Drawings

[0042] Figure 1 It is a position relationship diagram of the rotating shaft and the milling machine tool rod of the present invention;

[0043] Figure 2 It is a position relationship diagram of the rotating shaft and the trepanning hole of the present invention;

[0044] Figure 3 It is a schematic diagram of the angle of the machine tool spindle of the rotor milling machine rotating counterclockwise in step S7;

[0045] Figure 4 Schematic diagram of the main body lower wire groove of the present invention.

[0046] In the figure: 1 - rotating shaft, 2 - excitation end encoder flange, 3 - milling machine tool bar, 4 - steam end inner oil baffle, 5 - excitation end inner oil baffle, 6 - trepanning hole, 10 - main body lower wire groove, 11 - steam end encoder flange, A - first machining zero point, B - second machining zero point, C - third machining zero point. Specific embodiments

[0047] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] The terms "arrangement", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[0051] Embodiment 1: A method for secondary alignment of the milling groove of the rotating shaft of a large water-hydrogen-cooled generator in this embodiment includes the following steps:

[0052] S1: Clean the workbench surface. The crane places the rotating shaft 1 on the supporting bearing bushes of the rotor milling machine. Install a dial indicator on the milling machine tool bar 3, and the tip of the dial indicator is flush with the head of the milling machine tool bar 3. Use the dial indicator to measure the spatial position of the main shaft platform of the rotating shaft 1 and relative to the rotor milling machine.

[0053] S2: Install the excitation end encoder flange 2 at the excitation end of the rotating shaft 1, and cooperate with the encoder of the rotor milling machine on the other side.

[0054] S3: Mount the excitation end of the rotating shaft 1 on the workbench or fixture of the rotor milling machine. There should be a machining allowance on the outer diameter of the position where the rotating shaft 1 is clamped by the rotor milling machine, which can be removed during subsequent turning to avoid affecting the appearance quality of the rotating shaft 1.

[0055] S4: Align the steam end inner oil baffle 4 and the excitation end inner oil baffle 5 of the rotating shaft 1 with respect to the height of the rotor milling machine, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the height direction. Align the steam end inner oil baffle 4 and the excitation end inner oil baffle 5 of the rotating shaft 1 with respect to the parallelism of the rotor milling machine, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the parallel direction.

[0056] S5: Clamp the rotating shaft 1 so that when the rotor milling machine cuts the rotating shaft 1, the rotating shaft 1 is in a relatively fixed position to avoid affecting the machining accuracy.

[0057] S6: Rotate the machine spindle of the rotor milling machine to align the blanking hole 6 on the rotating shaft 1 with the milling cutter bar 3, and set the first machining zero point A.

[0058] S7: Rotate the machine spindle of the rotor milling machine counterclockwise by an angle, and set and mark the second machining zero point B.

[0059] S8: Machine the body undercut groove 10, dove-tail groove, damping groove and the groove on the steam end shaft table of the rotating shaft 1.

[0060] S9: Remove the clamping of the rotating shaft 1 to facilitate lifting the rotating shaft 1 by a crane.

[0061] S10: The crane lifts the rotating shaft 1 and rotates it 180°, and places the rotating shaft 1 back on the support bearing bush of the rotor milling machine.

[0062] S11: Install the steam end encoder flange 11 at the steam end of the rotating shaft 1, and mate it with the encoder of the rotor milling machine on the other side.

[0063] S12: Mount the steam end of the rotating shaft 1 on the workbench or fixture of the rotor milling machine.

[0064] S13: Align the steam end inner oil baffle 4 and the excitation end inner oil baffle 5 of the rotating shaft 1 with respect to the height of the rotor milling machine, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the height direction. Align the steam end inner oil baffle 4 and the excitation end inner oil baffle 5 of the rotating shaft 1 with respect to the parallelism of the rotor milling machine, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the parallel direction.

[0065] S14: Rotate the machine spindle of the rotor milling machine to align the body undercut groove 10 of the rotating shaft 1 with the milling cutter bar 3, align the concentricity of the rotating shaft 1 and the rotor milling machine, and set the third machining zero point C.

[0066] S15: Clamp the rotating shaft 1 to prevent the rotating shaft 1 from moving when the rotor milling machine cuts the rotating shaft 1, resulting in a decrease in machining accuracy.

[0067] S16: Machine the grooves and holes on the excitation end shaft table of the rotating shaft 1 to complete all the machining of the rotating shaft 1 on the rotor milling machine.

[0068] More specifically: In the step S4, extend the milling cutter bar 3 of the milling machine to the leftmost and uppermost positions of the outer circle of the excitation end inner oil baffle 5, record the vertical coordinate of the rotor milling machine at this time, move along the axial direction across the excitation end inner oil baffle 5, and observe the changing value of the dial indicator.

[0069] Set the maximum value of the dial indicator to 0, keep the vertical coordinate of the rotor milling machine unchanged, extend the milling cutter bar 3 of the milling machine to the leftmost position of the outer circle of the steam end inner oil baffle 4, move along the axial direction across the steam end inner oil baffle 4 until the changing value of the dial indicator does not exceed 0.03 mm; otherwise, adjust the vertical position of the rotor milling machine.

[0070] More specifically: In the step S4, extend the milling cutter bar 3 of the milling machine to the innermost position in the horizontal direction relative to the rotor milling machine of the outer circle of the steam end inner oil baffle 4 until the dial indicator just touches the steam end inner oil baffle 4 of the rotating shaft 1, move along the axial direction across the steam end inner oil baffle 4, and observe the changing value of the dial indicator.

[0071] Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling cutter bar 3 at this time, keep the parallel coordinate of the rotor milling machine relative to the rotating shaft unchanged, move the axial position of the rotor milling machine, extend the milling cutter bar 3 of the milling machine to the innermost position in the horizontal direction relative to the rotor milling machine of the outer circle of the excitation end inner oil baffle 5, input the coordinate value in the extending direction of the milling cutter bar 3 on the machine tool, move along the axial direction across the excitation end inner oil baffle 5, observe the changing value of the dial indicator at this time, and adjust the position of the corresponding static pressure pad of the rotor milling machine until the changing value of the dial indicator does not exceed 0.03 mm.

[0072] More specifically: In the step S6, the first machining zero point A is at the exact center of the nesting hole 6. Set the nesting hole 6 into an initial groove to improve the appearance quality of the rotating shaft 1 after machining.

[0073] More specifically: In the step S7, the second machining zero point B is the polar center line of the rotating shaft 1, which is the reference for machining the rotating shaft 1 and the steam end.

[0074] More specifically: In the step S8, the body undercut groove 10 is the reference for aligning the rotor milling machine and the rotating shaft 1 coaxially.

[0075] More specifically: In the step S13, extend the milling cutter bar 3 of the milling machine to the leftmost and uppermost positions of the outer circle of the excitation end inner oil baffle 5, record the vertical coordinate of the rotor milling machine at this time, move along the axial direction across the excitation end inner oil baffle 5, and observe the changing value of the dial indicator.

[0076] Set the maximum value of the dial indicator to 0. Keep the vertical coordinate of the rotary milling machine unchanged. Extend the milling cutter bar 3 of the milling machine to the leftmost side of the outer circle of the inner oil baffle 4 at the steam end, and move it axially across the inner oil baffle 4 at the steam end until the change in the dial indicator value does not exceed 0.03 mm. Otherwise, adjust the vertical position of the rotary milling machine.

[0077] More specifically: In S13, extend the milling cutter bar 3 of the milling machine to the innermost side in the horizontal direction relative to the rotary milling machine of the outer circle of the inner oil baffle 4 at the steam end until the dial indicator just touches the inner oil baffle 4 at the steam end of the rotating shaft 1. Move it axially across the inner oil baffle 4 at the steam end, and observe the change value of the dial indicator.

[0078] Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling cutter bar 3 at this time. Keep the parallel coordinate of the rotary milling machine relative to the rotating shaft unchanged. Move the axial position of the rotary milling machine. Extend the milling cutter bar 3 of the milling machine to the innermost side in the horizontal direction relative to the rotary milling machine of the outer circle of the inner oil baffle 5 at the excitation end. Input the coordinate value in the extending direction of the milling cutter bar 3 on the machine tool, move it axially across the inner oil baffle 5 at the excitation end, observe the change value of the dial indicator at this time, and adjust the position of the corresponding static pressure pad of the rotary milling machine until the change in the dial indicator value does not exceed 0.03 mm.

[0079] More specifically: In S14, extend the milling cutter bar 3 to the side wall of the processed lower wire groove 10 of the body, move it axially across the side wall of the lower wire groove 10 of the body, and observe the change value of the dial indicator, and adjust the position of the corresponding static pressure pad of the rotary milling machine until the change in the dial indicator value does not exceed 0.03 mm.

[0080] More specifically: In S14, the third machining zero point C is the machining zero point for the excitation end of the rotating shaft 1. By reasonably arranging the coordinate relationship between the rotating shaft 1 and the rotary milling machine, after the rotating shaft 1 rotates 180°, it can still meet the alignment and machining accuracy before rotating 180°, ensuring the machining quality of the rotating shaft 1.

[0081] After the rotating shaft 1 rotates 180°, after aligning the horizontal and parallel positions of the rotary milling machine and the rotating shaft 1, use the side wall of the processed lower wire groove 10 of the body as a reference to calibrate the rotating shaft 1 again, so as to ensure the accuracy of other positions of the machining holes and grooves after the rotating shaft 1 rotates 180°.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. As long as there is no structural conflict, the various features in the specific embodiments disclosed in this application can be combined with each other in any way, and it will not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0083] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A secondary alignment process method for milling slots on the shaft of a large water-hydrogen cooled generator, characterized in that It includes the following steps: S1: Clean the workbench. The crane places the rotating shaft (1) on the supporting bearing pads of the rotor milling machine. Install a dial indicator on the milling cutter bar (3) of the milling machine, with the tip of the dial indicator flush with the head of the milling cutter bar (3). Use the dial indicator to measure the spatial position of the main shaft platform of the rotating shaft (1) and relative to the rotor milling machine; S2: Install an excitation end encoder flange (2) at the excitation end of the rotating shaft (1), and cooperate with the encoder of the rotor milling machine on the other side; S3: Clamp the excitation end of the rotating shaft (1) on the workbench or fixture of the rotor milling machine; S4: Align the steam end inner oil baffle (4) and the excitation end inner oil baffle (5) of the rotating shaft (1) in terms of height relative to the rotor milling machine, so that the rotor milling machine and the rotating shaft (1) have the same coordinate in the height direction. Align the steam end inner oil baffle (4) and the excitation end inner oil baffle (5) of the rotating shaft (1) relative to the rotor milling machine in parallel, so that the rotor milling machine and the rotating shaft (1) have the same coordinate in the parallel direction; S5: Clamp the rotating shaft (1); S6: Rotate the machine spindle of the rotor milling machine to align the nesting hole (6) on the rotating shaft (1) with the milling cutter bar (3), and set the first machining zero point (A); S7: Rotate the machine spindle of the rotor milling machine counterclockwise by an angle, and set and mark the second machining zero point (B); S8: Machine the body undercut groove (10), dovetail groove, damping groove and the groove on the steam end shaft platform of the rotating shaft (1); S9: Remove the clamping of the rotating shaft (1); S10: The crane lifts the rotating shaft (1) and rotates it 180°, and places the rotating shaft (1) back on the supporting bearing pads of the rotor milling machine; S11: Install a steam end encoder flange (11) at the steam end of the rotating shaft (1), and cooperate with the encoder of the rotor milling machine on the other side; S12: Clamp the steam end of the rotating shaft (1) on the workbench or fixture of the rotor milling machine; S13: Align the steam end inner oil baffle (4) and the excitation end inner oil baffle (5) of the rotating shaft (1) in terms of height relative to the rotor milling machine, so that the rotor milling machine and the rotating shaft (1) have the same coordinate in the height direction. Align the steam end inner oil baffle (4) and the excitation end inner oil baffle (5) of the rotating shaft (1) relative to the rotor milling machine in parallel, so that the rotor milling machine and the rotating shaft (1) have the same coordinate in the parallel direction; S14: Rotate the machine spindle of the rotor milling machine to align the body undercut groove (10) of the rotating shaft (1) with the milling cutter bar (3), align the concentricity of the rotating shaft (1) and the rotor milling machine, and set the third machining zero point (C); S15: Clamp the rotating shaft (1); S16: Machine the groove and hole on the excitation end shaft platform of the rotating shaft (1) to complete all machining of the rotating shaft (1) on the rotor milling machine.

2. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In the said S4, extend the milling cutter bar (3) to the leftmost and uppermost positions of the outer circle of the excitation end inner oil baffle (5), record the coordinate of the rotor milling machine in the height direction at this time, draw along the axial direction across the excitation end inner oil baffle (5), and observe the changing value of the dial indicator; Set the maximum value of the said dial indicator to 0, keep the coordinate of the rotor milling machine in the height direction unchanged, extend the milling cutter bar (3) to the leftmost position of the outer circle of the steam end inner oil baffle (4), and draw along the axial direction across the steam end inner oil baffle (4) until the change value of the dial indicator does not exceed 0.03 mm, otherwise adjust the position of the rotor milling machine in the height direction.

3. A secondary alignment process method for milling slots on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S4, extend the milling machine tool shank (3) to the innermost side in the horizontal direction of the outer circle of the steam end inner oil baffle (4) relative to the rotor milling machine until the dial indicator just touches the steam end inner oil baffle (4) of the rotating shaft (1), draw along the axial direction across the steam end inner oil baffle (4), and observe the value change of the dial indicator. Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling machine tool shank (3) at this time, keep the parallel coordinates of the rotor milling machine relative to the rotating shaft unchanged, move the axial position of the rotor milling machine, extend the milling machine tool shank (3) to the innermost side in the horizontal direction of the outer circle of the exciter end inner oil baffle (5) relative to the rotor milling machine, input the coordinate value in the extending direction of the milling machine tool shank (3) on the machine tool, draw along the axial direction across the exciter end inner oil baffle (5), observe the value change of the dial indicator at this time, and adjust the position of the corresponding hydrostatic pad of the rotor milling machine until the value change of the dial indicator does not exceed 0.03 mm.

4. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S6, the first machining zero point (A) is at the exact center of the nesting hole (6).

5. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S7, the second machining zero point (B) is the polar center line of the rotating shaft (1), serving as the reference for machining the rotating shaft (1) and the steam end.

6. A secondary alignment process method for milling slots on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S8, the body lower wire groove (10) is the reference for aligning the rotor milling machine and the rotating shaft (1) coaxially.

7. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S13, extend the milling machine tool shank (3) to the leftmost and uppermost positions of the outer circle of the exciter end inner oil baffle (5), record the coordinate in the height direction of the rotor milling machine at this time, draw along the axial direction across the exciter end inner oil baffle (5), and observe the value change of the dial indicator. Set the maximum value of the dial indicator to 0, keep the coordinate in the height direction of the rotor milling machine unchanged, extend the milling machine tool shank (3) to the leftmost side of the outer circle of the steam end inner oil baffle (4), draw along the axial direction across the steam end inner oil baffle (4) until the value change of the dial indicator does not exceed 0.03 mm, otherwise adjust the position of the rotor milling machine in the height direction.

8. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S13, extend the milling machine tool shank (3) to the innermost side in the horizontal direction of the outer circle of the steam end inner oil baffle (4) relative to the rotor milling machine until the dial indicator just touches the steam end inner oil baffle (4) of the rotating shaft (1), draw along the axial direction across the steam end inner oil baffle (4), and observe the value change of the dial indicator. Set the maximum value of the dial indicator to 0, record the coordinate value in the extending direction of the milling machine tool shank (3) at this time, keep the parallel coordinates of the rotor milling machine relative to the rotating shaft unchanged, move the axial position of the rotor milling machine, extend the milling machine tool shank (3) to the innermost side in the horizontal direction of the outer circle of the exciter end inner oil baffle (5) relative to the rotor milling machine, input the coordinate value in the extending direction of the milling machine tool shank (3) on the machine tool, draw along the axial direction across the exciter end inner oil baffle (5), observe the value change of the dial indicator at this time, and adjust the position of the corresponding hydrostatic pad of the rotor milling machine until the value change of the dial indicator does not exceed 0.03 mm.

9. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S14, extend the milling machine tool shank (3) to the side wall of the machined body lower wire groove (10), draw along the axial direction across the side wall of the body lower wire groove (10), and observe the value change of the dial indicator, adjust the position of the corresponding hydrostatic pad of the rotor milling machine until the value change of the dial indicator does not exceed 0.03 mm.

10. A secondary alignment process method for milling grooves on the shaft of a large water-hydrogen cooled generator according to claim 1, characterized in that: In S14, the third machining zero point (C) is the machining zero point for the exciter end of the rotating shaft (1).

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