A large water hydrogen cooling generator rotating shaft milling groove secondary alignment process method

Abstract

A secondary alignment process for milling grooves on the shaft of a large water-hydrogen-cooled generator belongs to the field of turbine generator rotor machining technology. It solves the problems of low production efficiency, high cost, and unstable quality in existing technologies. Key technical points: The pre-machined inner oil baffles at the steam end and excitation end of the large water-hydrogen-cooled generator shaft are used as references for aligning the shaft with the rotor milling machine for parallelism and height. After rotating the shaft 180°, alignment is performed again, and then the shaft is corrected again using the pre-machined lower groove sidewall as a reference. This invention avoids frequent tool changes and repositioning operations caused by equipment travel limitations, making the machining process more continuous and efficient. It enables the machining task to be completed using existing equipment without modification, saving significant equipment modification costs, ensuring shaft machining accuracy, improving shaft production efficiency, guaranteeing product quality, and saving labor time.

Description

Technical Field

[0001] This invention relates to the field of turbine generator rotor processing technology, specifically a secondary alignment process for milling grooves on the shaft of a large water-hydrogen cooled generator. Background Technology

[0002] As a core component of large water-hydrogen-cooled generators, the shaft must possess sufficient rigidity and strength to meet the requirements of high-load operation. With the increase in unit capacity, the diameter and axial length of the shaft increase accordingly, leading to larger dimensions for the shaft base, lead wire grooves, and body grooves. Consequently, each of these components requires enlargement and lengthening. To ensure machining accuracy, the shaft needs to be machined.

[0003] Existing shaft machining typically employs high-precision rotor milling machines and CNC machining. High-precision rotor milling machines offer high machining accuracy, good surface quality, reduced surface roughness, high machining efficiency (multiple processes can be completed in a single setup), and the ability to machine complex shapes to meet special requirements.

[0004] Meanwhile, high-precision rotor milling also has many limitations: high equipment cost, large procurement and supporting costs; high requirements for operators; complex equipment maintenance and high maintenance costs; as the size of the shaft increases further, the machining stroke of the rotor milling machine is limited, and it cannot meet the machining needs of ultra-long or ultra-large diameter 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 production efficiency.

[0005] Therefore, there is an urgent need to propose a secondary alignment process for milling grooves on the 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 prior art, the present invention designs a secondary alignment process for milling grooves on the shaft of a large water-hydrogen cooled generator.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

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

[0009] S1: Clean the worktable surface, place the spindle on the support bearing of the rotor milling machine using a crane, install a dial indicator on the milling machine cutter bar with the tip of the dial indicator flush with the head of the milling machine cutter bar, and use the dial indicator to measure the main bearing of the spindle and its spatial position relative to the rotor milling machine.

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

[0011] S3: Mount the excitation end of the rotating shaft onto the worktable or fixture of the rotor milling machine;

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

[0013] S5: Mounting shaft;

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

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

[0016] S8: Machining the body of the shaft with the lower groove, dovetail groove, damping groove, and groove on the steam end shaft platform;

[0017] S9: Remove the mounting clips from the rotating shaft;

[0018] S10: The crane lifts the shaft and rotates it 180°, then places the shaft back onto the support bearing of the rotor milling machine;

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

[0020] S12: Mount the steam end of the rotating shaft onto the worktable or fixture of the rotor milling machine;

[0021] S13: Align the height of the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft relative to the rotor milling machine, so that the rotor milling machine and the rotating shaft are in the same height direction coordinates. Align the parallelism of the steam end inner oil baffle and the excitation end inner oil baffle of the rotating shaft relative to the rotor milling machine, so that the rotor milling machine and the rotating shaft are in the same parallel direction coordinates.

[0022] S14: The spindle of the rotary milling machine aligns the lower groove of the spindle body with the milling machine tool holder, aligns the spindle and the rotor milling machine for concentricity, and sets the third machining zero point;

[0023] S15: Mounting shaft;

[0024] S16: Machining the slots and holes on the excitation end of the shaft, completing all machining of the shaft on the rotor milling machine.

[0025] Further: In S4, the milling machine cutter bar is extended to the leftmost and topmost position on the outer circle of the inner oil baffle of the exciter end, the vertical coordinates of the rotor milling machine are recorded at this time, the cutter bar is traversed along the axial direction across the inner oil baffle of the exciter end, and the value of the dial indicator change is observed.

[0026] Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar to the leftmost side of the outer circle of the inner oil baffle of the steam end, and slide it along the axial direction across the inner oil baffle of the steam end until the dial indicator value changes by no more than 0.03mm. Otherwise, adjust the vertical position of the rotor milling machine.

[0027] Further: In S4, the milling machine cutter bar is extended to the innermost side of the outer circle of the inner oil baffle of the steam end relative to the horizontal direction of the rotor milling machine, until the dial indicator just touches the inner oil baffle of the steam end of the rotating shaft, and is slid along the axial direction across the inner oil baffle of the steam end, and the change in the value of the dial indicator is observed.

[0028] Set the maximum value of the dial indicator to 0, and record the coordinate value of the milling machine cutter stick extension direction 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 and extend the milling machine cutter stick to the innermost side of the outer circle of the inner oil baffle of the exciter end relative to the horizontal direction of the rotor milling machine. Input the coordinate value of the milling machine cutter stick extension direction on the machine tool, and slide it along the axial direction across the inner oil baffle of the exciter end. Observe the change in the value of the dial indicator at this time, and adjust the position of the corresponding hydrostatic bearing of the rotor milling machine until the change in the dial indicator value does not exceed 0.03mm.

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

[0030] Furthermore: In S7, the second machining zero point is the extreme center line of the shaft, serving as the reference for machining the shaft and the steam end.

[0031] Furthermore, in S8, the lower groove of the body is a reference for aligning the rotor milling machine with the shaft.

[0032] Further: In S13, the milling machine cutter bar is extended to the leftmost and topmost position on the outer circle of the inner oil baffle of the exciter end, the vertical coordinates of the rotor milling machine are recorded at this time, the cutter bar is traversed along the axial direction of the inner oil baffle of the exciter end, and the value of the dial indicator change is observed.

[0033] Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar to the leftmost side of the outer circle of the inner oil baffle of the steam end, and slide it along the axial direction across the inner oil baffle of the steam end until the dial indicator value changes by no more than 0.03mm. Otherwise, adjust the vertical position of the rotor milling machine.

[0034] Further: In S13, the milling machine cutter bar is extended to the innermost side of the outer circle of the inner oil baffle of the steam end relative to the horizontal direction of the rotor milling machine, until the dial indicator just touches the inner oil baffle of the steam end of the rotating shaft, and is swept along the inner oil baffle of the steam end along the axial direction, and the change in the value of the dial indicator is observed.

[0035] Set the maximum value of the dial indicator to 0, and record the coordinate value of the milling machine cutter stick extension direction 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 and extend the milling machine cutter stick to the innermost side of the outer circle of the inner oil baffle of the exciter end relative to the horizontal direction of the rotor milling machine. Input the coordinate value of the milling machine cutter stick extension direction on the machine tool, and slide it along the axial direction across the inner oil baffle of the exciter end. Observe the change in the value of the dial indicator at this time, and adjust the position of the corresponding hydrostatic bearing of the rotor milling machine until the change in the dial indicator value does not exceed 0.03mm.

[0036] Further: In S14, the milling machine cutter bar is extended to the side wall of the machined lower groove of the body, and is slid along the axial direction across the side wall of the lower groove of the body. The value of the dial indicator is observed, and the position of the corresponding static pressure bearing of the rotor milling machine is adjusted until the change of the dial indicator value does not exceed 0.03mm.

[0037] Furthermore: In S14, the third machining zero point is the zero point of machining the excitation end of the rotating shaft.

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

[0039] 1. This invention effectively reduces positioning errors, improves the relative accuracy of the milled groove position with respect to the shaft and other parts of the rotating shaft, and ensures that the positional and dimensional accuracy of the milled groove meets the design requirements, thereby guaranteeing the overall machining accuracy of the rotating shaft.

[0040] 2. This invention can complete as many machining tasks as possible in a single setup, avoiding frequent tool changes and repositioning operations caused by equipment travel limitations, making the machining process more continuous and efficient.

[0041] 3. This invention enables the completion of processing tasks using existing equipment without modification, saving a significant amount of equipment modification funds, ensuring the processing accuracy of the shaft, improving the production efficiency of the shaft, guaranteeing product quality, and saving labor time. Attached Figure Description

[0042] Figure 1 This is a diagram showing the positional relationship between the rotating shaft and the milling machine tool holder of the present invention;

[0043] Figure 2 This is a diagram showing the positional relationship between the rotating shaft and the sleeve hole of the present invention;

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

[0045] Figure 4 This is a schematic diagram of the lower groove of the main body of the present invention.

[0046] In the diagram: 1-rotating shaft, 2-exciter encoder flange, 3-milling machine cutter bar, 4-steam end inner oil baffle, 5-exciter inner oil baffle, 6-sleeving hole, 10-body lower groove, 11-steam end encoder flange, A-first machining zero point, B-second machining zero point, C-third machining zero point. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0048] The terms "set up," "connect," and "fix" should be interpreted broadly. 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] Example 1: A secondary alignment process for milling grooves on the shaft of a large water-hydrogen cooled generator according to this example includes the following steps:

[0052] S1: Clean the worktable. The crane places the rotating shaft 1 on the support bearing of the rotor milling machine. Install a dial indicator on the milling machine cutter bar 3. The tip of the dial indicator is flush with the head of the milling machine cutter bar 3. Use the dial indicator to measure the main shaft table of the rotating shaft 1 and its spatial position relative to the rotor milling machine.

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

[0054] S3: Mount the excitation end of the rotating shaft 1 on the worktable or in the fixture of the rotor milling machine. A margin should be left on the outer diameter of the position where the rotating shaft 1 is clamped by the rotor milling machine. This margin can be removed during subsequent turning to avoid affecting the appearance quality of the rotating shaft 1.

[0055] S4: Align the height of 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, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the height direction. Align the parallelism of 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, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the parallel direction.

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

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

[0058] S7: Rotate the spindle angle of the rotor milling machine counterclockwise to set and mark the second machining zero point B;

[0059] S8: Machining the lower groove 10, dovetail groove, damping groove and the groove on the steam end shaft platform of the shaft 1.

[0060] S9: Remove the clamps from shaft 1 to facilitate the crane lifting shaft 1;

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

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

[0063] S12: Mount the steam end of the rotating shaft 1 onto the worktable or fixture of the rotor milling machine;

[0064] S13: Align the height of 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, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the height direction. Align the parallelism of 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, so that the rotor milling machine and the rotating shaft 1 have the same coordinates in the parallel direction.

[0065] S14: The spindle of the rotary milling machine makes the lower groove 10 of the body of the rotating shaft 1 align with the milling machine tool bar 3, find the concentricity between the rotating shaft 1 and the rotary milling machine, and set the third machining zero point C.

[0066] S15: Mount the rotating shaft 1 to prevent it from moving when the rotor milling machine is cutting the rotating shaft 1, which would cause a decrease in machining accuracy;

[0067] S16: Machining the slots and holes on the excitation end of shaft 1, completing all machining of shaft 1 on the rotor milling machine.

[0068] More specifically: In S4, the milling machine cutter bar 3 is extended to the leftmost and topmost position on the outer circle of the inner oil baffle 5 at the excitation end, the vertical coordinates of the rotor milling machine are recorded at this time, the rotor milling machine is traversed along the axial direction across the inner oil baffle 5 at the excitation end, and the value of the dial indicator change is observed.

[0069] Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar 3 to the leftmost side of the outer circle of the inner oil baffle 4 at the steam end, and slide it along the axial direction across the inner oil baffle 4 at the steam end until the dial indicator value changes by no more than 0.03 mm. Otherwise, adjust the vertical position of the rotor milling machine.

[0070] More specifically: In S4, the milling machine cutter bar 3 is extended to the innermost side of the outer circle of the steam end inner oil baffle 4 relative to the horizontal direction of the rotor milling machine, until the dial indicator just touches the steam end inner oil baffle 4 of the rotating shaft 1, and is slid along the axial direction across the steam end inner oil baffle 4, and the change in the dial indicator value is observed.

[0071] Set the maximum value of the dial indicator to 0, and record the coordinate value of the milling machine cutter bar 3 in the extension direction at this time. The parallel coordinate of the rotor milling machine relative to the rotating shaft remains unchanged. Move the axial position of the rotor milling machine and extend the milling machine cutter bar 3 to the innermost side of the outer circle of the inner oil stop 5 of the excitation end in the horizontal direction relative to the rotor milling machine. Input the coordinate value of the extension direction of the milling machine cutter bar 3 on the machine tool, and slide it along the axial direction across the inner oil stop 5 of the excitation end. Observe the change in the value of the dial indicator at this time, and adjust the position of the corresponding static pressure bearing of the rotor milling machine until the change in the dial indicator value does not exceed 0.03mm.

[0072] More specifically: In S6, the first machining zero point A is at the exact center of the sleeve hole 6, setting the sleeve hole 6 as the initial groove, thereby improving the appearance quality of the rotating shaft 1 after machining.

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

[0074] More specifically: In S8, the lower groove 10 of the body is a reference for aligning the rotor milling machine with the rotating shaft 1.

[0075] More specifically: In S13, the milling machine cutter bar 3 is extended to the leftmost and topmost position on the outer circle of the inner oil baffle 5 at the excitation end, the vertical coordinates of the rotor milling machine are recorded at this time, the rotor milling machine is traversed along the axial direction across the inner oil baffle 5 at the excitation end, and the value of the dial indicator change is observed.

[0076] Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar 3 to the leftmost side of the outer circle of the inner oil baffle 4 at the steam end, and slide it along the axial direction across the inner oil baffle 4 at the steam end until the dial indicator value changes by no more than 0.03 mm. Otherwise, adjust the vertical position of the rotor milling machine.

[0077] More specifically: In S13, the milling machine cutter bar 3 is extended to the innermost side of the outer circle of the steam end inner oil baffle 4 relative to the horizontal direction of the rotor milling machine, until the dial indicator just touches the steam end inner oil baffle 4 of the rotating shaft 1, and is slid along the axial direction across the steam end inner oil baffle 4, and the change in the dial indicator value is observed.

[0078] Set the maximum value of the dial indicator to 0, and record the coordinate value of the milling machine cutter bar 3 in the extension direction at this time. The parallel coordinate of the rotor milling machine relative to the rotating shaft remains unchanged. Move the axial position of the rotor milling machine and extend the milling machine cutter bar 3 to the innermost side of the outer circle of the inner oil stop 5 of the excitation end in the horizontal direction relative to the rotor milling machine. Input the coordinate value of the extension direction of the milling machine cutter bar 3 on the machine tool, and slide it along the axial direction across the inner oil stop 5 of the excitation end. Observe the change in the value of the dial indicator at this time, and adjust the position of the corresponding static pressure bearing of the rotor milling machine until the change in the dial indicator value does not exceed 0.03mm.

[0079] More specifically: In S14, the milling machine cutter bar 3 is extended to the side wall of the machined lower groove 10 of the body, and is slid along the axial direction across the side wall of the lower groove 10 of the body. The value of the dial indicator is observed, and the position of the corresponding static pressure bearing of the rotor milling machine is adjusted until the change of the dial indicator value does not exceed 0.03mm.

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

[0081] After the rotating shaft 1 rotates 180°, the horizontal and parallel positions of the rotor milling machine and the rotating shaft 1 are aligned. Then, the rotating shaft 1 is corrected again with the side wall of the finished body groove 10 as a reference, so as to ensure the accuracy of the machining hole and other positions of the groove 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 not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; 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 will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0083] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 for milling grooves on the shaft of a large water-hydrogen cooled generator, characterized in that, Includes the following steps: S1: Clean the worktable, place the rotating shaft (1) on the support bearing of the rotor milling machine with the crane, install a dial indicator on the milling machine cutter bar (3), with the tip of the dial indicator flush with the head of the milling machine cutter bar (3), and use the dial indicator to measure the main shaft table of the rotating shaft (1) and its spatial position relative to the rotor milling machine. S2: Install the excitation end encoder flange (2) on the excitation end of the rotating shaft (1), and mate the encoder of the rotor milling machine on the other side; S3: Mount the excitation end of the rotating shaft (1) onto the worktable or fixture of the rotor milling machine; S4: Align the height of 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, so that the rotor milling machine and the rotating shaft (1) are in the same height direction coordinates. Align the parallelism of 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, so that the rotor milling machine and the rotating shaft (1) are in the same parallel direction coordinates. S5: Mounting shaft (1); S6: Rotate the spindle of the rotor milling machine to align the bushing hole (6) on the spindle (1) with the milling cutter bar (3) and set the first machining zero point (A); S7: Rotate the spindle angle of the rotor milling machine counterclockwise, and set and mark the second machining zero point (B); S8: Machining the body of the rotating shaft (1) with the lower groove (10), the pigeon tail groove, the damping groove and the groove on the steam end shaft platform; S9: Remove the mounting clip of the rotating shaft (1); S10: The crane lifts the shaft (1) and rotates it 180°, then places the shaft (1) back on the support bearing of the rotor milling machine; S11: Install the steam end encoder flange (11) on the steam end of the rotating shaft (1), and mate the encoder of the rotor milling machine on the other side; S12: Mount the steam end of the rotating shaft (1) onto the worktable or fixture of the rotor milling machine; S13: Align the height of 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, so that the rotor milling machine and the rotating shaft (1) are in the same height direction coordinates. Align the parallelism of 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, so that the rotor milling machine and the rotating shaft (1) are in the same parallel direction coordinates. S14: The spindle of the rotating rotor milling machine makes the lower groove (10) of the body of the rotating shaft (1) align with the milling machine tool bar (3), find the concentricity between the rotating shaft (1) and the rotor milling machine, and set the third machining zero point (C). S15: Mounting shaft (1); S16: Machining the slots and holes on the excitation end of the rotating shaft (1) to complete all machining of the rotating shaft (1) on the rotor milling machine.

2. The process for milling and secondary alignment of a large water-hydrogen-cooled generator shaft according to claim 1, characterized in that: In S4, the milling machine cutter bar (3) is extended to the leftmost and topmost of the outer circle of the inner oil baffle (5) of the excitation end, and the high and low coordinates of the rotor milling machine are recorded at this time. The milling machine is then moved along the axial direction across the inner oil baffle (5) of the excitation end, and the value of the change of the dial gauge is observed. Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar (3) to the leftmost side of the outer circle of the inner oil baffle (4) of the steam end, and slide it along the axial direction across the inner oil baffle (4) of the steam end until the dial indicator value changes by no more than 0.03 mm. Otherwise, adjust the vertical position of the rotor milling machine.

3. The method according to claim 1, characterized in that: In S4, the milling machine cutter bar (3) is extended to the innermost side of the outer circle of the steam end inner oil baffle (4) relative to the horizontal direction of the rotor milling machine until the dial indicator just touches the steam end inner oil baffle (4) of the rotating shaft (1), and is swept along the axial direction of the steam end inner oil baffle (4), and the value of the change of the dial indicator is observed. Set the maximum value of the dial indicator to 0, record the coordinate value of the extension direction of the milling machine 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 machine cutter bar (3) to the innermost side of the outer circle of the inner oil stop (5) of the excitation end relative to the horizontal direction of the rotor milling machine, input the coordinate value of the extension direction of the milling machine cutter bar (3) on the machine tool, slide along the axial direction across the inner oil stop (5) of the excitation end, observe the change value of the dial indicator at this time, adjust the position of the corresponding static pressure pad of the rotor milling machine until the change of the dial indicator value does not exceed 0.03mm.

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

5. The method according to claim 1, wherein the method is characterized in that: In S7, the second machining zero point (B) is the extreme center line of the rotating shaft (1) and the reference for machining the rotating shaft (1) and the steam end.

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

7. The method according to claim 1, wherein the method is characterized in that: In S13, the milling machine cutter bar (3) is extended to the leftmost and topmost of the outer circle of the inner oil baffle (5) of the excitation end, and the high and low coordinates of the rotor milling machine are recorded at this time. The milling machine is then slid along the axial direction across the inner oil baffle (5) of the excitation end, and the value of the dial gauge change is observed. Set the maximum value of the dial indicator to 0, keep the vertical coordinates of the rotor milling machine unchanged, extend the milling machine cutter bar (3) to the leftmost side of the outer circle of the inner oil baffle (4) of the steam end, and slide it along the axial direction across the inner oil baffle (4) of the steam end until the dial indicator value changes by no more than 0.03 mm. Otherwise, adjust the vertical position of the rotor milling machine.

8. The process for milling and secondary alignment of a large water-hydrogen cooled generator shaft according to claim 1, characterized in that: In S13, the milling machine cutter bar (3) is extended to the innermost side of the outer circle of the steam end inner oil baffle (4) relative to the horizontal direction of the rotor milling machine until the dial indicator just touches the steam end inner oil baffle (4) of the rotating shaft (1), and is swept along the axial direction of the steam end inner oil baffle (4), and the value of the change of the dial indicator is observed. Set the maximum value of the dial indicator to 0, record the coordinate value of the extension direction of the milling machine 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 machine cutter bar (3) to the innermost side of the outer circle of the inner oil stop (5) of the excitation end relative to the horizontal direction of the rotor milling machine, input the coordinate value of the extension direction of the milling machine cutter bar (3) on the machine tool, slide along the axial direction across the inner oil stop (5) of the excitation end, observe the change value of the dial indicator at this time, adjust the position of the corresponding static pressure pad of the rotor milling machine until the change of the dial indicator value does not exceed 0.03mm.

9. The method according to claim 1, wherein the method is characterized in that: In step S14, the milling machine cutter bar (3) is extended to the side wall of the machined lower groove (10) of the body, and is slid along the axial direction across the side wall of the lower groove (10) of the body. The value of the dial indicator is observed, and the position of the corresponding static pressure bearing of the rotor milling machine is adjusted until the value of the dial indicator does not change by more than 0.03 mm.

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

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