A method for manufacturing a high-speed rotor

Abstract

A method for manufacturing a high-speed rotor, the high-speed rotor comprising shaft one and shaft two; shaft one comprising a first inner hole and a second inner hole of different apertures; shaft two comprising a first shaft section and a second shaft section of different diameters; one end of the first shaft section of shaft two passes through the second inner hole of shaft one and is fixedly connected to one end of shaft one. The manufacturing method comprises the following steps: processing shaft one and shaft two to predetermined sizes respectively; assembling and welding shaft one and shaft two to form a rotor; performing surface treatment and fine machining on the assembled rotor so that the surface roughness of the rotor is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm; and finally performing dynamic balancing so that the dynamic balancing grade reaches G0.4-2.5. The method can manufacture high-precision and high-yield high-speed rotors and realize fully automated production.

Description

Technical Field

[0001] The present invention relates to the field of high-speed shaft processing and detection, in particular to the field of batch production, processing and detection of special slender rotors such as gas turbine or micro gas turbine generator rotors, electric turbochargers, and ultra-high-speed generators, and specifically to a method for manufacturing a high-speed rotor. Background Art

[0002] Usually, high-speed rotors need to be used with non-contact bearings or high-precision ball bearings, so the default application premise of high-speed rotors is usually high-precision rotors. In high-speed rotors, the production, quality inspection, and consistency control of high-speed shafts and high-speed disks have always been relatively difficult, and are also the main technical obstacles to the large-scale mass production of products using high-speed shafts. Especially when it comes to high-speed two-section shafts and three-section shafts that need to be assembled with motor cores. Due to the high precision requirements, high assembly difficulty, and low yield rate of high-speed shafts, the production cost of common processes is very high, mainly in terms of material and labor costs wasted by scrap parts. The precision requirements include but are not limited to surface finish (especially in the scenario of using air bearings), surface hardening treatment, hot-mounted verticality of the disk, coaxiality of the shaft (especially the coaxiality of the two-section shaft and three-section shaft), processing and precision assembly of the disk, thermal stress of the shrink-fit process, residual internal stress during machining, dynamic balancing accuracy, etc.

[0003] Usually, a shaft is processed once on the tooling, and its accuracy is relatively easy to guarantee. However, once it involves repeated clamping and assembly, it is easy to exceed the tolerance, especially when it involves application scenarios with thermal stress and internal stress. Usually, after the disc workpiece is processed and hot-fitted on the shaft, its verticality will shift by about 0.1-1°; the coaxiality of the two-section precision-machined shaft deviates by about 1‰-1% through friction welding or ordinary welding and heat treatment. If it is a three-section shaft, the tolerances are accumulated in sequence; the accumulated thermal stress during the hot-fitting process will have an adverse effect of about 1% on the verticality, coaxiality, including axial positioning and other factors after the workpiece cools; in addition, the impact of welding and assembly on the internal imbalance of the rotor will limit the accuracy of dynamic balancing. Ordinary surface treatment, especially repeated clamping process, will accumulate tolerances. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide a method for manufacturing a high-speed rotor so as to achieve high-efficiency, low-cost and batch manufacturing of the high-speed rotor and implement effective detection.

[0005] The technical solution of the present invention is: a method for manufacturing a high-speed rotor, the high-speed rotor comprising shaft one and shaft two; shaft one comprising a first inner hole and a second inner hole of different diameters, the diameter of the first inner hole is smaller than the diameter of the second inner hole, and a first bearing seat is arranged on the outer circumference corresponding to the first inner hole; shaft two comprises a first shaft section and a second shaft section of different diameters, the diameter of the first shaft section is larger than the diameter of the second shaft section; the first shaft section of shaft two is provided with an inner hole; one end of the first shaft section of shaft two passes through the second inner hole of shaft one and is fixedly connected to one end of shaft one, and a second bearing seat is arranged on the outer circumference of the portion of the first shaft section of shaft two not inserted into the second inner hole; the rotation speed of the high-speed rotor is 150000rpm-160000rpm;

[0006] The manufacturing method comprises the following steps:

[0007] S100, machining the first axis and the second axis to predetermined sizes respectively;

[0008] S200, assembly, welding:

[0009] Insert the first shaft section of shaft 2 into the second inner hole of shaft 1, and weld the mating surfaces of shaft 1 and shaft 2;

[0010] S300, surface treatment:

[0011] The surface treatment time is 1-60 seconds, and the online microwave surface treatment is completed to release the thermal stress. After the rotor is cooled to room temperature and the stress is removed, a rough product is obtained;

[0012] S400, finishing: Finishing to the rotor surface roughness of Ra0.05-0.2, coaxiality of 0.001-0.03mm;

[0013] S500, dynamic balance:

[0014] The finely machined rotor is placed in a dynamic balancing device and dynamically balanced based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the non-working surface of the rotor is removed to remove the imbalance so that the dynamic balancing level reaches G0.4-2.5.

[0015] Furthermore, the step S100 processes the shaft 1 and the shaft 2 to predetermined sizes respectively:

[0016] The steps for machining axis 1 include:

[0017] SA110, remove stress from the bar material used for machining shaft 1 and rough-machine the outer circle, leaving a margin for the first bearing position, which meets the requirements of subsequent combined machining;

[0018] SA120, finish machining the outer circles except the first bearing position to the size; use a boring machine to finish machining the inner holes on both sides of the shaft to the size with the aid of tooling; finish machining the assembly end faces at both ends to the size;

[0019] SA130, single-piece dynamic balancing, the shaft 1 is dynamically balanced, the dynamic balancing position is the second inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5;

[0020] The steps of machining axis two (2) include:

[0021] SB110, the bar material used for machining the second shaft is stress-relieved and then the outer circle is roughly machined, and a margin is left for the second bearing position, and the margin meets the requirements of subsequent combined machining;

[0022] SB120, finish machining other outer circles except the second bearing position to the size; process the inner hole to the size; finish machining the assembly end faces at both ends to the size;

[0023] SB130, finish welding surface to size;

[0024] SB140, single-piece dynamic balancing, dynamic balancing is performed on the second shaft, the dynamic balancing position is the inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5;

[0025] and / or

[0026] The finishing steps of step S400 include:

[0027] S410, clamping: using the outer circle corresponding to the second inner hole of shaft one as the clamping reference surface for positioning and clamping, ensuring that the coaxiality between the clamping reference surface of the entire rotor and the first inner hole of shaft one is maintained at 0.001-0.03mm;

[0028] S420, high-frequency wave finishing: based on the clamping reference surface, use the high-frequency wave surface treatment process to finish the parts with a distortion exceeding 0.1mm and a margin exceeding 0.05mm. During the high-frequency wave finishing process, a margin is left, and the margin meets the requirements of subsequent combined processing; the removed parts include the first bearing position, the second bearing position and the welding position; the frequency of the high-frequency wave is 0.1-1MHz;

[0029] S430, hardening treatment: hardening treatment is performed on the entire rotor;

[0030] S440, finishing: finishing the second axis section of axis 2 to size;

[0031] S450, overall finishing: Use fine grinding process to remove excess to size at one time, so that the rotor surface roughness is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm.

[0032] Furthermore, the high-speed rotor also includes a motor magnetic core installed in the second inner hole of the shaft one, and one end of the first shaft section of the shaft two passes through the second inner hole of the shaft one and abuts against the motor magnetic core;

[0033] The step S100 processes the shaft 1 and the shaft 2 to predetermined sizes respectively:

[0034] The steps for machining axis 1 include:

[0035] SA110, remove stress from the bar material used for machining shaft 1 and rough-machine the outer circle, leaving a margin for the first bearing position, which meets the requirements of subsequent combined machining;

[0036] SA120, finish machining the outer circles except the first bearing position to the size; use a boring machine to finish machining the inner holes on both sides of the shaft to the size with the aid of tooling; finish machining the assembly end faces at both ends to the size;

[0037] SA130, single-piece dynamic balancing, the shaft 1 is dynamically balanced, the dynamic balancing position is the second inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5;

[0038] The steps for machining axis 2 include:

[0039] SB110, the bar material used for machining the second shaft is stress-relieved and then the outer circle is roughly machined, and a margin is left for the second bearing position, and the margin meets the requirements of subsequent combined machining;

[0040] SB120, finish machining other outer circles except the second bearing position to the size; process the inner hole to the size; finish machining the assembly end faces at both ends to the size;

[0041] SB130, finish welding surface to size;

[0042] SB140, single-piece dynamic balancing, dynamic balancing is performed on the second shaft, the dynamic balancing position is the inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5;

[0043] and / or

[0044] The steps of assembling and welding in step S200 include:

[0045] S210, inserting the finely machined motor magnetic core into the second inner hole of shaft one by interference fit; inserting the first shaft section of shaft two into the second inner hole to abut against the motor magnetic core;

[0046] S220, welding the mating surfaces of the first shaft and the second shaft using a welding process;

[0047] and / or

[0048] The finishing steps of step S400 include:

[0049] S410, clamping: Use the outer circle corresponding to the motor core as the clamping reference surface for positioning and clamping, and ensure that the coaxiality between the clamping reference surface of the entire rotor and the inner hole on the right side of the shaft 1 is maintained at 0.001-0.03mm;

[0050] S420, high-frequency wave finishing: based on the clamping reference surface, use the high-frequency wave surface treatment process to finish the parts with a distortion exceeding 0.1mm and a margin exceeding 0.05mm. During the high-frequency wave finishing process, a margin is left, and the margin meets the requirements of subsequent combined processing; the removed parts include the first bearing position, the second bearing position and the welding position; the frequency of the high-frequency wave is 0.1-1MHz;

[0051] S430, hardening treatment: hardening treatment is performed on the entire rotor;

[0052] S440, finishing: finishing the second axis section of axis 2 to size;

[0053] S450, overall finishing: Use fine grinding process to remove excess to size at one time, so that the rotor surface roughness is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm.

[0054] Furthermore, the high-speed rotor also includes a thrust plate, which is fixedly sleeved on one end side of the outer circle corresponding to the second inner hole of the shaft;

[0055] The step S100 also includes processing the thrust plate to a predetermined size, including the following steps:

[0056] SC110, rough machining after stress relief of the blank used for machining the thrust plate;

[0057] SC120, finish machining the inner hole of the thrust plate to size, the surface roughness of the inner hole after finishing is Ra0.2-Ra0.4, and the end surface of the thrust plate is left with a margin, which meets the requirements of subsequent combined processing;

[0058] SC130, single-piece dynamic balancing, the thrust plate is dynamically balanced, the dynamic balancing position is the outer circumference of the thrust plate, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5;

[0059] The steps of assembling and welding in step S200 include:

[0060] S210, inserting the first shaft section of shaft 2 into the second inner hole of shaft 1; sleeve the thrust plate on one end side of the outer circle corresponding to the second inner hole of shaft 1 by means of interference fit, and aligning the end side of the thrust plate with the end side of the outer circle corresponding to the second inner hole of shaft 1;

[0061] S220, using a welding process, respectively welding the mating surfaces of the thrust plate and the shaft one, and the mating surfaces of the shaft one and the shaft two at the aligned sides of the thrust plate and the shaft one end;

[0062] The removed parts in step S420 include the first bearing position, the second bearing position, the welding position and the end surface of the thrust plate;

[0063] The step S450 also includes ensuring that the verticality between the thrust plate and the axis 1 is 0.001-0.03 mm.

[0064] Furthermore, the high-speed rotor also includes a thrust plate, which is fixedly sleeved on one end side of the outer circle corresponding to the second inner hole of the shaft;

[0065] The step S100 also includes processing the thrust plate to a predetermined size, including the following steps:

[0066] SC110, rough machining after stress relief of the blank used for machining the thrust plate;

[0067] SC120, finish machining the inner hole of the thrust plate to size, the surface roughness of the inner hole after finishing is Ra0.2-Ra0.4, and the end surface of the thrust plate is left with a margin, which meets the requirements of subsequent combined processing;

[0068] SC130, single-piece dynamic balancing, the thrust plate is dynamically balanced, the dynamic balancing position is the outer circumference of the thrust plate, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5;

[0069] The steps of assembling and welding in step S200 include:

[0070] S210, heat-fit the finely machined motor core into the second inner hole of shaft one by interference fit; insert the first shaft section of shaft two into the second inner hole of shaft one to abut against the motor core; sleeve the thrust plate on one end side of the outer circle corresponding to the second inner hole of shaft one by interference fit, and align the end side of the thrust plate with the end side of the outer circle corresponding to the second inner hole of shaft one;

[0071] S220, using a welding process, respectively welding the mating surfaces of the thrust plate and the shaft one, and the mating surfaces of the shaft one and the shaft two at the aligned sides of the thrust plate and the shaft one end;

[0072] The removed parts in step S420 include the first bearing position, the second bearing position, the welding position and the end surface of the thrust plate;

[0073] The step S450 also includes ensuring that the verticality between the thrust plate and the axis 1 is 0.001-0.03 mm.

[0074] Furthermore, the high-speed rotor further comprises a compressor, a turbine and a locking nut, wherein the compressor and the turbine are sequentially fixedly sleeved on the second shaft section of the second shaft and fastened by the locking nut;

[0075] The step S500 of dynamic balancing includes the following steps:

[0076] S510, placing the rotor after step S400 in a dynamic balancing device, and performing dynamic balancing based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to remove the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5;

[0077] S520, sequentially fixing the compressor, turbine and locking nut after single-piece dynamic balancing on the second shaft, and tightening them with a torque wrench; the dynamic balancing grade of the compressor, turbine and locking nut after single-piece dynamic balancing reaches G0.4-2.5;

[0078] S530, using a motor or air blowing to drive the rotor to rotate, and performing dynamic balancing based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to remove the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5.

[0079] Furthermore, the step S530 includes:

[0080] S531. Use a motor or air blower to increase the rotor speed to 8000-12000rpm and check the dynamic balance. Remove the amount of the non-working surface of the rotor to remove the imbalance and make the dynamic balance level reach G0.4-2.5;

[0081] S532, use a motor or air blower to drive the rotor to speed up to 20000-25000rpm and check the dynamic balance, remove the amount of the rotor non-working surface to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5;

[0082] S533, use a motor or air blower to drive the rotor to speed up to 25000-60000rpm and check the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5;

[0083] S534, use a motor or air blower to drive the rotor to speed up to 120000rpm and check the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5;

[0084] S535. Use a motor or air blower to drive the rotor to full speed and check the dynamic balance. Remove the amount of the non-working surface of the rotor to remove the imbalance and make the dynamic balance level reach G0.4-2.5.

[0085] Furthermore, the finishing process in step S440 adopts a grinding process.

[0086] Furthermore, in the step S450, the grinding process uses a special grinding wheel mold, and the special grinding wheel mold is provided with an inner cavity, and the inner wall shape and size of the inner cavity are the same as the designed shape and size of the rotor. The rotor is placed in the special grinding wheel mold and finely ground to the rotor size.

[0087] Furthermore, after all the finishing steps in steps S100 - 400 , the rotor dimensions are checked.

[0088] Furthermore, the dynamic balance level is selected as G1.

[0089] Furthermore, in step S500, the amount of the non-working surface of the rotor is removed by using an automated laser rust removal or a non-contact process using a 0.1-1 GHz high frequency wave.

[0090] Furthermore, when a motor core is provided, in step S500, a motor is used to drive the rotor to rotate for a dynamic balancing test, and the stator of the motor is non-contactly sleeved on the outer circle corresponding to the motor core, and the motor core serves as the rotor of the motor.

[0091] Furthermore, in the dynamic balancing device, the motor and / or bearing used are the motor and / or bearing originally installed when the high-speed rotor is working.

[0092] Furthermore, the bearing is an air bearing.

[0093] Furthermore, the non-working surface includes the first inner hole of shaft one and the boss of the thrust plate.

[0094] Furthermore, when air blowing is used to drive the rotor to rotate, the gas supply component blows the turbine to drive the rotor to rotate.

[0095] Furthermore, the non-working surface of the rotor includes the first inner hole of shaft one, the boss of the thrust plate, the locking nut and the portion of shaft two that passes through the locking nut.

[0096] Furthermore, a spacer ring for axial positioning is provided between the compressor and the turbine, and the compressor, spacer ring, turbine and locking nut are fixedly mounted on the second shaft in sequence and tightened using a torque wrench; the dynamic balancing grade of the single-piece dynamically balanced compressor, spacer ring, turbine and locking nut reaches G0.4-2.5.

[0097] Furthermore, the dynamic balance level is selected as G1.

[0098] The advantages of the present invention compared with the prior art are:

[0099] 1. The high-speed rotor manufacturing method of the present invention achieves high-precision and high-yield production by combining special processes such as rough machining, welding, shrink fit assembly, heat treatment, fine machining, surface treatment, tooling, measurement and clamping control in a specific manner, sequence and process requirements.

[0100] 2. The high-speed rotor manufacturing method of the present invention achieves a yield rate that can be industrialized in mass production, while the yield rate of conventional high-speed rotor production usually does not exceed 2 / 3.

[0101] 3. The high-speed rotor manufacturing method of the present invention has compact production links and improves efficiency.

[0102] 4. The high-speed rotor manufacturing method of the present invention has high reliability and can surely obtain workpieces that meet technical requirements.

[0103] 5. The production cost of the high-speed rotor manufacturing method of the present invention is lower than that of the traditional method.

[0104] 6. The high-speed rotor manufacturing method of the present invention greatly reduces the precision requirements of the equipment.

[0105] 7. The high-speed rotor manufacturing method of the present invention has a very high degree of automation, which can reach 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0106] Figure 1 is a schematic structural diagram of a high-speed rotor according to Embodiment 1 of the present invention;

[0107] Figure 2 is a schematic structural diagram of a high-speed rotor according to Embodiment 2 of the present invention;

[0108] Figure 3 is a schematic structural diagram of a high-speed rotor according to Embodiment 3 of the present invention;

[0109] Figure 4 is a schematic structural diagram of a high-speed rotor according to Embodiment 4 of the present invention;

[0110] Figure 5 is a schematic structural diagram of a high-speed rotor according to Embodiment 5 of the present invention;

[0111] Figure 6 is a schematic structural diagram of a high-speed rotor according to Embodiment 6 of the present invention;

[0112] Figure 7 is a schematic structural diagram of a high-speed rotor according to Embodiment 7 of the present invention;

[0113] Figure 8 is a schematic structural diagram of a high-speed rotor according to an eighth embodiment of the present invention;

[0114] Fig. 9 It is a structural schematic diagram of the axis 1 of the present invention;

[0115] Fig.10 It is a structural schematic diagram of the shaft 2 of the present invention;

[0116] Fig.11 It is a structural schematic diagram of the thrust plate of the present invention;

[0117] Fig.12 is a schematic diagram of the assembly structure corresponding to embodiments 1 and 3 of the present invention;

[0118] Fig.13 is a schematic diagram of the assembly structure corresponding to embodiments 2 and 4 of the present invention;

[0119] Fig.14 is a schematic diagram of the assembly structure corresponding to embodiments 5 and 7 of the present invention;

[0120] Fig.15 is a schematic diagram of the assembly structure corresponding to embodiments 6 and 8 of the present invention;

[0121] Fig.16 is a schematic diagram of the clamping structure corresponding to embodiments 1 and 3 of the present invention;

[0122] Fig.17 is a schematic diagram of the clamping structure corresponding to embodiments 2 and 4 of the present invention;

[0123] Fig.18 is a schematic diagram of the clamping structure corresponding to embodiments 5 and 7 of the present invention;

[0124] Fig.19 It is a schematic diagram of the clamping structure corresponding to embodiments 6 and 8 of the present invention.

[0125] Reference numerals:

[0126] 1: Axis 1; 2: Axis 2; 3: Compressor; 4: Turbine; 5: Locking nut; 6: Motor core; 7: Thrust plate; 8: First bearing position; 9: Second bearing position; 10: Allowance; 11: Welding surface; 12: Clamping reference surface. DETAILED DESCRIPTION

[0127] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0128] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0129] The present invention relates to 8 embodiments of the high-speed rotor structure, the speed of the high-speed rotor is 150000rpm-160000rpm, preferably 155000rpm, the 8 embodiments of the high-speed rotor structure are as follows Figure 1-8 shown.

[0130] Example 1

[0131] The high-speed rotor structure of Example 1 is as follows Figure 1 As shown, it includes shaft 1 and shaft 2; shaft 1 includes a first inner hole and a second inner hole with different apertures, wherein the aperture of the first inner hole is smaller than the aperture of the second inner hole, and a first bearing position 8 is arranged on the outer circumference corresponding to the first inner hole; shaft 2 includes a first shaft segment and a second shaft segment with different diameters, and the diameter of the first shaft segment is larger than the diameter of the second shaft segment; one end of the first shaft segment of shaft 2 passes through the second inner hole of shaft 1 and is fixedly connected to one end of shaft 1, and a second bearing position 9 is arranged on the outer circumference of the portion of the first shaft segment of shaft 2 not inserted into the second inner hole.

[0132] Preferably, the first shaft section of shaft 2 is provided with an inner hole to achieve lightweight.

[0133] Preferably, the outer diameter of the portion of the first shaft section of shaft 2 inserted into one end of the second inner hole of shaft 1 is larger than the outer diameter of the second bearing seat portion 9 of the outer circumference not inserted into the second inner hole of shaft 1.

[0134] Example 2

[0135] The high-speed rotor structure of Example 2 is as follows: Figure 2 As shown, a motor core 6 is fixedly installed in the second inner hole of shaft 1 of the high-speed rotor, and one end of the first shaft section of shaft 2 passes through the second inner hole of shaft 1 and abuts against the motor core 6. Other structures are the same as those in embodiment 1 and will not be repeated here.

[0136] Example 3

[0137] The high-speed rotor structure of Example 3 is as follows Figure 3 As shown, based on the structure of the high-speed rotor of Example 1, it also includes a compressor 3, a turbine 4 and a locking nut 5. The compressor 3 and the turbine 4 are fixedly sleeved on the second shaft section of the shaft 2 in sequence and fastened by the locking nut 5.

[0138] Preferably, a spacer ring (not shown in the figure) is provided between the compressor 3 and the turbine 4 to enhance the rigidity of the rotor.

[0139] Example 4

[0140] The high-speed rotor structure of Example 4 is as follows Figure 4 As shown, a motor core 6 is fixedly installed in the second inner hole of shaft 1 of the high-speed rotor, and one end of the first shaft section of shaft 2 passes through the second inner hole of shaft 1 and abuts against the motor core 6. Other structures are the same as those in Example 3 and will not be repeated here.

[0141] Example 5

[0142] The high-speed rotor structure of Example 5 is as follows: Figure 5 As shown, based on the structure of the high-speed rotor of Example 1, it also includes a thrust plate 7, which is fixedly sleeved on one end side of the outer circle corresponding to the second inner hole of the shaft 1. The sleeve position of the thrust plate 7 corresponds to the position where the first shaft section of the shaft 2 is inserted into the second inner hole of the shaft 1.

[0143] Example 6

[0144] The high-speed rotor structure of Example 6 is as follows: Figure 6 As shown, a motor core 6 is fixedly installed in the second inner hole of shaft 1 of the high-speed rotor, and one end of the first shaft section of shaft 2 passes through the second inner hole of shaft 1 and abuts against the motor core 6. Other structures are the same as those in Example 5 and will not be repeated here.

[0145] Example 7

[0146] The high-speed rotor structure of Example 7 is as follows Figure 7As shown, based on the structure of the high-speed rotor of Example 5, it also includes a compressor 3, a turbine 4 and a locking nut 5. The compressor 3 and the turbine 4 are fixedly sleeved on the second shaft section of the shaft 2 in sequence and fastened by the locking nut 5.

[0147] Preferably, a spacer ring (not shown in the figure) is provided between the compressor 3 and the turbine 4 to enhance the rigidity of the rotor.

[0148] Example 8

[0149] The high-speed rotor structure of Example 8 is as follows: Figure 8 As shown, a motor core 6 is fixedly installed in the second inner hole of shaft 1 of the high-speed rotor, and one end of the first shaft section of shaft 2 passes through the second inner hole of shaft 1 and abuts against the motor core 6. Other structures are the same as those in Example 7 and will not be repeated here.

[0150] The present invention provides a method for processing the above high-speed rotor, which specifically comprises the following steps:

[0151] S100, machining axis 1 and axis 2 respectively.

[0152] like Fig. 9 As shown, Fig. 9 Schematic diagram of the structure of shaft 1, the processing method of shaft 1 includes the following steps:

[0153] SA110, remove stress from the bar material used for machining shaft 1 and rough-machine the outer circle, leaving a margin for the first bearing position 8, the margin meeting the requirements of subsequent combined machining;

[0154] SA120, finish machining the outer circles except the first bearing position 8 to the size; use a boring machine to finish machining the inner holes on both sides of the shaft 1 to the size with the aid of tooling; finish machining the assembly end faces at both ends to the size;

[0155] SA130, single-piece dynamic balancing, dynamically balance the shaft 1, the dynamic balancing position is taken at the second inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5, preferably G1.

[0156] like Fig.10 As shown, Fig.10 Schematic diagram of the structure of shaft 2, the processing method of shaft 2 comprises the following steps:

[0157] SB110, the bar material used for machining the second shaft 2 is stress-relieved and then rough-machined for the outer circle, and a margin is left for the second bearing position 9, and the margin meets the requirements of subsequent combined machining;

[0158] SB120, finish machining the outer circle except the second bearing position 9 to the size; process the inner hole to the size; finish machining the assembly end faces at both ends to the size;

[0159] SB130, finish welding surface 11 to size;

[0160] SB140, single-piece dynamic balancing, dynamic balancing is performed on the shaft 2, the dynamic balancing position is the inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5, preferably G1.

[0161] Furthermore, the step S100 also includes processing the thrust plate 7 .

[0162] like Fig.11 As shown, Fig.11 : is a structural schematic diagram of a thrust plate, and the processing method of the thrust plate comprises the following steps:

[0163] SC110, rough machining after stress relief of the blank used for machining the thrust plate 7;

[0164] SC120, finish machining the inner hole to size, the surface roughness of the inner hole after finishing is Ra0.2-Ra0.4, and the end face of the thrust plate is left with a margin of 10 (attached Fig.15 ), the margin meets the requirements of subsequent combined processing;

[0165] SC130, single-piece dynamic balancing, the thrust plate 7 is dynamically balanced, the dynamic balancing position is the outer circumference of the thrust plate, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5, preferably G1.

[0166] S200, assembly and welding. Specifically, it includes the following steps:

[0167] S210, insert the finely machined motor core 6 into the second inner hole by interference fit; insert the first shaft section of the shaft 2 into the second inner hole to abut against the motor core 6; sleeve the thrust plate 7 on one end side of the outer circle corresponding to the second inner hole of the shaft 1 by interference fit, and align the end side of the thrust plate 7 with the end side of the outer circle corresponding to the second inner hole of the shaft 1;

[0168] S220, using a welding process, preferably laser welding, to weld the thrust plate 7 and the mating surface of the shaft 1, and the mating surface of the shaft 1 and the shaft 2, respectively, at the side where the thrust plate 7 and the shaft 1 are aligned. Fig.15 The welding surface 11 in.

[0169] In step S200, the drawings corresponding to embodiment 1 and embodiment 3 are shown in FIG. Fig.12 , see the accompanying drawings corresponding to Embodiment 2 and Embodiment 4 Fig.13 , see the accompanying drawings corresponding to Embodiment 5 and Embodiment 7 Fig.14 , see the accompanying drawings corresponding to Embodiment 6 and Embodiment 8 Fig.15 .

[0170] S300, surface treatment

[0171] 1-60 seconds, preferably 10 seconds, to complete the online (without removing the fixture or assembly line) microwave surface treatment, release the thermal stress, and obtain a rough finished product after the rotor is cooled to room temperature and the stress is removed.

[0172] S400, finishing

[0173] S410, Clamping

[0174] The outer circle corresponding to the motor core 6 (the embodiment without the motor core 6 is based on the second inner hole of the shaft 1) is used as the clamping reference surface 12 for positioning and clamping, ensuring that the coaxiality of the clamping reference surface 12 of the entire rotor and the inner hole on the right side of the shaft 1 is maintained at 0.001-0.03mm, preferably 0.02mm.

[0175] In step S400, the drawings corresponding to Embodiment 1 and Embodiment 3 are shown in FIG. Fig.16 , see the accompanying drawings corresponding to Embodiment 2 and Embodiment 4 Fig.17 , see the accompanying drawings corresponding to Embodiment 5 and Embodiment 7 Fig.18 , see the accompanying drawings corresponding to Embodiment 6 and Embodiment 8 Fig.19 .

[0176] S420, high frequency wave finishing

[0177] like Figure 16-19 The rotor shown is a rotor with microscopic distortion. At this moment, based on the clamping reference surface, the parts with distortion exceeding 0.1mm and margin exceeding 0.05mm are processed using a high-frequency wave (0.1-1MHz) surface treatment process. During the high-frequency wave finishing process, a margin is left, which meets the requirements of subsequent combined processing. The above-mentioned removed parts are the first bearing position 8, the second bearing position 9, the welding position and the end face of the thrust plate 7, etc., thereby improving the processing accuracy and surface roughness of the entire rotor.

[0178] S430, hardening treatment

[0179] The entire rotor is hardened to improve the surface roughness, hardness and fatigue resistance of the entire rotor.

[0180] S440, finishing

[0181] Finish machining the second shaft section of shaft 2 to size, preferably using a grinding process.

[0182] S450, overall finishing

[0183] Use fine grinding technology to remove excess at one time to ensure that the rotor surface roughness is Ra0.05-0.2, the coaxiality is 0.001-0.03mm, and the verticality between the thrust plate 7 and the shaft 1 is 0.001-0.03mm.

[0184] Among them, the fine grinding process adopts a special grinding wheel mold, and the special grinding wheel mold is provided with an inner cavity. The inner wall shape and size of the inner cavity are the same as the designed shape and size of the rotor. The rotor after step S440 is placed in the special grinding wheel mold (here the rotor is first aligned and clamped on the fine grinding tooling, and then placed in the special grinding wheel mold as a whole), and the inner cavity of the special grinding wheel mold fine grinds the rotor to size.

[0185] Preferably, in step S100-400, the finishing step is to inspect the dimensions of each piece.

[0186] S500, Dynamic Balance

[0187] S510, placing the rotor after step S450 in a dynamic balancing device, and performing dynamic balancing based on the first bearing position 8 and / or the second bearing position 9. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to achieve the removal of the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5 dynamic balancing accuracy, preferably G1.

[0188] Preferably, the amount of the non-working surface of the rotor is removed using a non-contact process such as automated laser rust removal or 0.1-1 GHz high frequency waves.

[0189] Preferably, for an embodiment provided with a motor core 6, a motor is used to drive the rotor to rotate to perform a dynamic balancing test, specifically, the stator of the motor is non-contactly sleeved on the outer circle corresponding to the motor core 6, and the motor core 6 serves as the rotor of the motor.

[0190] Preferably, in the dynamic balancing device, the motor and / or bearing used are the motor and / or bearing originally installed when the rotor is working. Further preferably, the bearing is an air bearing.

[0191] Preferably, the non-working surface includes but is not limited to the first inner hole of shaft 1 and the boss of thrust plate 7.

[0192] S520. Fix the compressor 3, turbine 4 and locking nut 5 after single-piece dynamic balancing on the shaft 2 2 in sequence and tighten them with a torque wrench; the dynamic balancing grade of the single-piece dynamically balanced compressor 3, turbine 4 and locking nut 5 reaches a dynamic balancing accuracy of G0.4-2.5, preferably G1.

[0193] S530, use a motor or air blower to drive the rotor to rotate, and perform dynamic balancing based on the first bearing position 8 and / or the second bearing position 9. During the dynamic balancing process, remove the amount of the non-working surface of the rotor to achieve the removal of the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5 dynamic balancing accuracy, preferably G1.

[0194] Preferably, when the motor is used to drive the rotor to rotate, the stator of the motor is non-contactly sleeved on the outer circle corresponding to the motor magnetic core 6, and the motor magnetic core 6 serves as the rotor of the motor.

[0195] Preferably, when air blowing is used to drive the rotor to rotate, the gas supply component blows the turbine 4 to drive the rotor to rotate.

[0196] Preferably, the non-working surface of the rotor includes but is not limited to the first inner hole of shaft 1, the boss of the thrust plate 7, the locking nut 5, and the portion of shaft 2 2 that passes through the locking nut 5.

[0197] Preferably, the amount of the non-working surface of the rotor is removed using a non-contact process such as automated laser rust removal or 0.1-1 GHz high frequency waves.

[0198] Preferably, the pneumatic drive components are a compressor 3 and a turbine 4. After the compressor 3 and the turbine 4 are installed on the rotor system from the right side, they are locked with a locking nut 5. Figure 5 shown.

[0199] Preferably, a spacer ring (not shown in the figure) for axial positioning is provided between the compressor 3 and the turbine 4, and the compressor 3, the spacer ring, the turbine 4, and the locking nut 5 are fixedly mounted on the shaft 2 in sequence and tightened using a torque wrench; the dynamic balancing grade of the single-piece dynamically balanced compressor 3, the spacer ring, the turbine 4, and the locking nut 5 reaches a dynamic balancing accuracy of G0.4-2.5, preferably G1.

[0200] Preferably, in the dynamic balancing device, the motor and / or bearing used are the motor and / or bearing originally installed when the rotor is working.

[0201] Preferably, a motor or air blower is used to drive the rotor to rotate, and dynamic balancing is performed based on the first bearing position 8 and / or the second bearing position 9. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to achieve the removal of the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5 dynamic balancing accuracy, preferably G1, including the following steps:

[0202] S531. Use a motor or air blower to drive the rotor to speed up to 8000-12000rpm and check the dynamic balance. Remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5 dynamic balance accuracy, preferably G1;

[0203] S532, use a motor or air blower to drive the rotor to speed up to 20000-25000rpm and detect the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5 dynamic balance accuracy, preferably G1;

[0204] S533, use a motor or air blower to drive the rotor to speed up to 25000-60000rpm and detect the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5 dynamic balance accuracy, preferably G1;

[0205] S534, use a motor or air blower to drive the rotor to speed up to 120000rpm and check the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5 dynamic balance accuracy, preferably G1;

[0206] S535. Use a motor or air blower to drive the rotor to full speed and check the dynamic balance. Remove the non-working surface of the rotor to remove the imbalance and make the dynamic balance level reach G0.4-2.5 dynamic balance accuracy, preferably G1.

[0207] In summary, the present invention provides a method for manufacturing a high-speed rotor, which includes shaft one and shaft two; shaft one includes a first inner hole and a second inner hole with different apertures; shaft two includes a first shaft segment and a second shaft segment with different diameters; one end of the first shaft segment of shaft two passes through the second inner hole of shaft one and is fixedly connected to one end of shaft one. The manufacturing method includes the following steps: processing shaft one and shaft two to predetermined sizes respectively; assembling and welding shaft one and shaft two to form a rotor; performing surface treatment and fine machining on the assembled rotor, so that the surface roughness of the rotor is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm; and finally performing dynamic balancing to achieve a dynamic balancing grade of G0.4-2.5. The method can manufacture high-precision and high-yield high-speed rotors, and realize fully automated production.

[0208] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0209] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a high-speed rotor, characterized in that: The high-speed rotor comprises shaft 1 and shaft 2; shaft 1 comprises a first inner hole and a second inner hole of different diameters, the diameter of the first inner hole is smaller than the diameter of the second inner hole, and a first bearing seat is arranged on the outer circumference corresponding to the first inner hole; shaft 2 comprises a first shaft section and a second shaft section of different diameters, the diameter of the first shaft section is larger than the diameter of the second shaft section; the first shaft section of shaft 2 is provided with an inner hole; one end of the first shaft section of shaft 2 passes through the second inner hole of shaft 1 and is fixedly connected to one end of shaft 1, and a second bearing seat is arranged on the outer circumference of the portion of the first shaft section of shaft 2 not inserted into the second inner hole; the rotation speed of the high-speed rotor is 150000rpm-160000rpm; The manufacturing method comprises the following steps: S100, machining the first axis and the second axis to predetermined sizes respectively; S200, assembly, welding: Insert the first shaft section of shaft 2 into the second inner hole of shaft 1, and weld the mating surfaces of shaft 1 and shaft 2; S300, surface treatment: The surface treatment time is 1-60 seconds, and the online microwave surface treatment is completed to release the thermal stress. After the rotor is cooled to room temperature and the stress is removed, a rough product is obtained; S400, finishing: Finishing to the rotor surface roughness Ra0.05-0.2, coaxiality 0.001-0.03mm; S500, dynamic balance: The finely machined rotor is placed in a dynamic balancing device and dynamically balanced based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the non-working surface of the rotor is removed to remove the imbalance so that the dynamic balancing level reaches G0.4-2.

5.

2. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: The step S100 processes the shaft 1 and the shaft 2 to predetermined sizes respectively: The steps for machining axis 1 include: SA110, the bar material used for machining shaft 1 is stress-relieved and then rough-machined on the outer circle, leaving a margin for the first bearing position, which meets the requirements of subsequent combined machining; SA120, finish machining the outer circles except the first bearing position to the size; use a boring machine to finish machining the inner holes on both sides of the shaft to the size with the aid of tooling; finish machining the assembly end faces at both ends to the size; SA130, single-piece dynamic balancing, the shaft 1 is dynamically balanced, the dynamic balancing position is the second inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5; The steps of machining axis two (2) include: SB110, the bar material used for machining the second shaft is stress-relieved and then the outer circle is roughly machined, and a margin is left for the second bearing position, and the margin meets the requirements of subsequent combined machining; SB120, finish machining other outer circles except the second bearing position to the size; process the inner hole to the size; finish machining the assembly end faces at both ends to the size; SB130, finish welding surface to size; SB140, single-piece dynamic balancing, dynamic balancing is performed on the second shaft, the dynamic balancing position is the inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5; and / or The finishing steps of step S400 include: S410, clamping: using the outer circle corresponding to the second inner hole of shaft one as the clamping reference surface for positioning and clamping, ensuring that the coaxiality between the clamping reference surface of the entire rotor and the first inner hole of shaft one is maintained at 0.001-0.03mm; S420, high-frequency wave finishing: based on the clamping reference surface, use the high-frequency wave surface treatment process to finish the parts with a distortion exceeding 0.1mm and a margin exceeding 0.05mm. During the high-frequency wave finishing process, a margin is left, and the margin meets the requirements of subsequent combined processing; the removed parts include the first bearing position, the second bearing position and the welding position; the frequency of the high-frequency wave is 0.1-1MHz; S430, hardening treatment: hardening treatment is performed on the entire rotor; S440, finishing: finishing the second axis section of axis 2 to size; S450, overall finishing: Use fine grinding process to remove excess to size at one time, so that the rotor surface roughness is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm.

3. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: It also includes a motor magnetic core, which is installed in the second inner hole of the shaft one, and one end of the first shaft section of the shaft two passes through the second inner hole of the shaft one and abuts against the motor magnetic core; The step S100 processes the shaft 1 and the shaft 2 to predetermined sizes respectively: The steps for machining axis 1 include: SA110, the bar material used for machining shaft 1 is stress-relieved and then rough-machined on the outer circle, leaving a margin for the first bearing position, which meets the requirements of subsequent combined machining; SA120, finish machining the outer circles except the first bearing position to the size; use a boring machine to finish machining the inner holes on both sides of the shaft to the size with the aid of tooling; finish machining the assembly end faces at both ends to the size; SA130, single-piece dynamic balancing, the shaft 1 is dynamically balanced, the dynamic balancing position is the second inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5; The steps for machining axis 2 include: SB110, the bar material used for machining the second shaft is stress-relieved and then the outer circle is roughly machined, and a margin is left for the second bearing position, and the margin meets the requirements of subsequent combined machining; SB120, finish machining other outer circles except the second bearing position to the size; process the inner hole to the size; finish machining the assembly end faces at both ends to the size; SB130, finish welding surface to size; SB140, single-piece dynamic balancing, dynamic balancing is performed on the second shaft, the dynamic balancing position is the inner hole, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5; and / or The steps of assembling and welding in step S200 include: S210, inserting the finely machined motor magnetic core into the second inner hole of shaft one by interference fit; inserting the first shaft section of shaft two into the second inner hole to abut against the motor magnetic core; S220, welding the mating surfaces of the first shaft and the second shaft using a welding process; and / or The finishing steps of step S400 include: S410, clamping: Use the outer circle corresponding to the motor core as the clamping reference surface for positioning and clamping, and ensure that the coaxiality between the clamping reference surface of the entire rotor and the inner hole on the right side of the shaft 1 is maintained at 0.001-0.03mm; S420, high-frequency wave finishing: based on the clamping reference surface, use the high-frequency wave surface treatment process to finish the parts with a distortion exceeding 0.1mm and a margin exceeding 0.05mm. During the high-frequency wave finishing process, a margin is left, and the margin meets the requirements of subsequent combined processing; the removed parts include the first bearing position, the second bearing position and the welding position; the frequency of the high-frequency wave is 0.1-1MHz; S430, hardening treatment: hardening treatment is performed on the entire rotor; S440, finishing: finishing the second axis section of axis 2 to size; S450, overall finishing: Use fine grinding process to remove excess to size at one time, so that the rotor surface roughness is Ra0.05-0.2 and the coaxiality is 0.001-0.03mm.

4. The method for manufacturing a high-speed rotor according to claim 2, characterized in that: The high-speed rotor also includes a thrust plate, which is fixedly sleeved on one end side of the outer circle corresponding to the second inner hole of the shaft; The step S100 also includes processing the thrust plate to a predetermined size, including the following steps: SC110, rough machining after stress relief of the blank used for machining the thrust plate; SC120, finish machining the inner hole of the thrust plate to size, the surface roughness of the inner hole after finishing is Ra0.2-Ra0.4, and the end surface of the thrust plate is left with a margin, which meets the requirements of subsequent combined processing; SC130, single-piece dynamic balancing, the thrust plate is dynamically balanced, the dynamic balancing position is the outer circumference of the thrust plate, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing level reaches G0.4-2.5; The steps of assembling and welding in step S200 include: S210, inserting the first shaft section of shaft 2 into the second inner hole of shaft 1; sleeve the thrust plate on one end side of the outer circle corresponding to the second inner hole of shaft 1 by means of interference fit, and aligning the end side of the thrust plate with the end side of the outer circle corresponding to the second inner hole of shaft 1; S220, using a welding process, respectively welding the mating surfaces of the thrust plate and the shaft one, and the mating surfaces of the shaft one and the shaft two at the aligned sides of the thrust plate and the shaft one end; The removed parts in step S420 include the first bearing position, the second bearing position, the welding position and the end surface of the thrust plate; The step S450 also includes ensuring that the verticality between the thrust plate and the axis 1 is 0.001-0.03 mm.

5. The method for manufacturing a high-speed rotor according to claim 3, characterized in that: The high-speed rotor also includes a thrust plate, which is fixedly sleeved on one end side of the outer circle corresponding to the second inner hole of the shaft; The step S100 also includes processing the thrust plate to a predetermined size, including the following steps: SC110, rough machining after stress relief of the blank used for machining the thrust plate; SC120, finish machining the inner hole of the thrust plate to size, the surface roughness of the inner hole after finishing is Ra0.2-Ra0.4, and the end surface of the thrust plate is left with a margin, which meets the requirements of subsequent combined processing; SC130, single-piece dynamic balancing, the thrust plate is dynamically balanced, the dynamic balancing position is the outer circumference of the thrust plate, the dynamic balancing speed is lower than the first-order critical speed of the high-speed rotor, and the dynamic balancing grade reaches G0.4-2.5; The steps of assembling and welding in step S200 include: S210, heat-fit the finely machined motor core into the second inner hole of shaft one by interference fit; insert the first shaft section of shaft two into the second inner hole of shaft one to abut against the motor core; sleeve the thrust plate on one end side of the outer circle corresponding to the second inner hole of shaft one by interference fit, and align the end side of the thrust plate with the end side of the outer circle corresponding to the second inner hole of shaft one; S220, using a welding process, respectively welding the mating surfaces of the thrust plate and the shaft one, and the mating surfaces of the shaft one and the shaft two at the aligned sides of the thrust plate and the shaft one end; The removed parts in step S420 include the first bearing position, the second bearing position, the welding position and the end surface of the thrust plate; The step S450 also includes ensuring that the verticality between the thrust plate and the axis 1 is 0.001-0.03 mm.

6. The method for manufacturing a high-speed rotor according to any one of claims 2 to 5, characterized in that: It also includes a compressor, a turbine and a locking nut, wherein the compressor and the turbine are sequentially fixedly sleeved on the second shaft section of the second shaft and are fastened by the locking nut; The step S500 of dynamic balancing includes the following steps: S510, placing the rotor after step S400 in a dynamic balancing device, and performing dynamic balancing based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to remove the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.5; S520, sequentially fixing the compressor, turbine and locking nut after single-piece dynamic balancing on the second shaft, and tightening them with a torque wrench; the dynamic balancing level of the compressor, turbine and locking nut after single-piece dynamic balancing reaches G0.4-2.5; S530, using a motor or air blowing to drive the rotor to rotate, and performing dynamic balancing based on the first bearing position and / or the second bearing position. During the dynamic balancing process, the amount of the non-working surface of the rotor is removed to remove the unbalanced amount, so that the dynamic balancing level reaches G0.4-2.

5.

7. The method for manufacturing a high-speed rotor according to claim 6, characterized in that: The step S530 includes: S531. Use a motor or air blower to increase the rotor speed to 8000-12000rpm and check the dynamic balance. Remove the amount of the non-working surface of the rotor to remove the imbalance and make the dynamic balance level reach G0.4-2.5; S532, use a motor or air blower to drive the rotor to speed up to 20000-25000rpm and check the dynamic balance, remove the amount of the rotor non-working surface to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5; S533, use a motor or air blower to drive the rotor to speed up to 25000-60000rpm and check the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5; S534, use a motor or air blower to drive the rotor to speed up to 120000rpm and check the dynamic balance, remove the amount of the non-working surface of the rotor to achieve the removal of the imbalance, so that the dynamic balance level reaches G0.4-2.5; S535. Use a motor or air blower to drive the rotor to full speed and check the dynamic balance. Remove the amount of the non-working surface of the rotor to remove the imbalance and make the dynamic balance level reach G0.4-2.

5.

8. The method for manufacturing a high-speed rotor according to claim 2, characterized in that: The step S440 is performed by a grinding process for finishing.

9. The method for manufacturing a high-speed rotor according to claim 2, characterized in that: In the step S450, the grinding process uses a special grinding wheel mold, which is provided with an inner cavity. The shape and size of the inner wall of the inner cavity are the same as the designed shape and size of the rotor. The rotor is placed in the special grinding wheel mold and finely ground to the rotor size.

10. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: After all the finishing steps in steps S100-400, the rotor dimensions are checked.

11. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: The dynamic balance level is selected as G1.

12. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: In the step S500, the amount of the non-working surface of the rotor is removed by using an automated laser rust removal or a non-contact process using a 0.1-1 GHz high frequency wave.

13. The method for manufacturing a high-speed rotor according to claim 1, characterized in that: When a motor core is provided, in step S500, a motor is used to drive the rotor to rotate for a dynamic balancing test, and the stator of the motor is non-contactly sleeved on the outer circle corresponding to the motor core, and the motor core serves as the rotor of the motor.

14. The method for manufacturing a high-speed rotor according to claim 13, characterized in that: In the dynamic balancing device, the motor and / or bearing used are the motor and / or bearing originally installed when the high-speed rotor is working.

15. The method for manufacturing a high-speed rotor according to claim 14, characterized in that: The bearing is an air bearing.

16. The method for manufacturing a high-speed rotor according to claim 6, characterized in that: The non-working surface includes the first inner hole of the shaft 1 and the boss of the thrust plate.

17. The method for manufacturing a high-speed rotor according to claim 7, characterized in that: When the rotor is driven to rotate by air blowing, the gas supply component blows the turbine to drive the rotor to rotate.

18. The method for manufacturing a high-speed rotor according to claim 7, characterized in that: The non-working surface of the rotor includes the first inner hole of the shaft one, the boss of the thrust plate, the locking nut and the part of the shaft two that passes through the locking nut.

19. The method for manufacturing a high-speed rotor according to claim 7, characterized in that: A spacer ring for axial positioning is arranged between the compressor and the turbine. The compressor, spacer ring, turbine and locking nut are fixedly mounted on the second shaft in sequence and tightened with a torque wrench. The dynamic balancing grade of the single-piece dynamically balanced compressor, spacer ring, turbine and locking nut reaches G0.4-2.

5.

20. The method for manufacturing a high-speed rotor according to claim 19, characterized in that: The dynamic balance level is selected as G1.

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