CN115001226A - Machining and assembling process for reducing radial displacement of motor shaft - Google Patents

Machining and assembling process for reducing radial displacement of motor shaft Download PDF

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Publication number
CN115001226A
CN115001226A CN202210559974.8A CN202210559974A CN115001226A CN 115001226 A CN115001226 A CN 115001226A CN 202210559974 A CN202210559974 A CN 202210559974A CN 115001226 A CN115001226 A CN 115001226A
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China
Prior art keywords
rotor
motor shaft
shaft
motor
machining
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CN202210559974.8A
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Chinese (zh)
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柳传友
武天宜
虞辉
陈磊
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SEC Electric Machinery Co Ltd
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SEC Electric Machinery Co Ltd
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Application filed by SEC Electric Machinery Co Ltd filed Critical SEC Electric Machinery Co Ltd
Priority to CN202210559974.8A priority Critical patent/CN115001226A/en
Publication of CN115001226A publication Critical patent/CN115001226A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/14—Casings; Enclosures; Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention relates to a processing and assembling process for reducing radial displacement of a motor shaft, belonging to the field of bearing processing and comprising the following steps of: step 1, a motor shaft sequentially adopts the processing technologies of rough turning, semi-finish turning and primary grinding; step 2, carrying out iron core lamination assembly of the motor shaft and deflection adjustment of an air duct of the rotor iron core; step 3, mounting a rotor conducting bar and welding a rotor end ring to enable a motor shaft and a rotor iron core to be matched to form a rotor; step 4, carrying out secondary grinding processing on the rotor; step 5, rotor correction is carried out, and mirror finishing is carried out by adopting Haokay equipment; step 6, the rotor end ring and the excircle of the rotor iron core are rotated to be processed by a vehicle; step 7, performing dynamic balance debugging on the rotor; step 8, debugging the sleeving concentricity of the stator; step 9, assembling the rotor and the stator; and step 10, installing a sliding bearing and an end cover. The invention can effectively reduce the shaft displacement when the motor operates, reduce the vibration of the motor and further improve the quality and the service life of the motor.

Description

Machining and assembling process for reducing radial displacement of motor shaft
Technical Field
The invention relates to a processing and assembling process for reducing radial displacement of a motor shaft, and belongs to the field of bearing processing.
Background
With the rapid development of national economy, the application range of large and medium-sized motors is wider and wider, and the dependence of various industries on the quality stability of the motors is higher and higher. The compressor is an indispensable machine for mining industry, chemical industry, machine manufacturing industry, refrigeration and gas separation engineering, national defense and other industries, the requirement of certain industries on the quality stability of the compressor is particularly high, and the motor serving as core driving equipment for the compressor to work can meet the market requirement only by necessarily and stably operating for a long time.
The motor rotating speed used on the compressor is generally higher, some large-scale compressors usually use high-speed large and medium-sized sliding bearing structure motors as driving equipment, most compressor enterprises require to monitor the axial and radial displacement of the working state of the motor, in order to monitor and guarantee the operation stability of the compressor more timely, certain compressor enterprises stipulate that the axial and radial displacement standard of the motor in high-speed operation is far higher than the national standard, the compressor in field operation is often stopped because the axial and radial displacement exceeds the standard, and many motor plants are frequently complained because the motor quality is not relevant.
Most customers use eddy current sensors to detect axial radial displacement of the motor. The axial displacement during the motor manufacturing process is mainly related to the factors such as the rotor shaft processing precision, the iron core laminating quality, the dynamic balance precision, the assembling quality and the like. The radial displacement of the shaft of the high-speed motor is easy to exceed the standard due to the overhigh rotating speed, so that the use quality and the service life are influenced, and the problem of how to reduce the radial displacement of the motor shaft is solved for many enterprises. Therefore, a machining and assembling process for reducing the radial displacement of the motor shaft is needed.
Disclosure of Invention
The invention aims to overcome the defects, reduce the axial radial displacement of the motor during operation through scientific and reasonable processing and assembling processes, improve the quality stability of the motor and prolong the service life of the motor.
According to the technical scheme provided by the invention, the processing and assembling process for reducing the radial displacement of the motor shaft comprises the following steps of:
step 1, a motor shaft sequentially adopts the processing technologies of rough turning, semi-finish turning and primary grinding;
step 2, after the motor shaft is ground for one time, carrying out iron core lamination assembly of the motor shaft and deflection adjustment of an air duct of a rotor iron core;
step 3, after the deflection of the air duct is adjusted, installing a rotor guide bar and a welding end ring to enable a motor shaft and a rotor iron core to be matched to form a rotor;
step 4, after the rotor conducting bar and the welded rotor end ring are welded, secondary grinding processing is carried out on the rotor;
step 5, after the rotor is subjected to secondary grinding processing, rotor correction is carried out, and mirror surface processing is carried out by adopting Haokang equipment;
step 6, after the rotor mirror surface is processed, a drop shaft type guard ring is installed on the rotor, and the outer circle of a rotor end ring and the outer circle of a rotor iron core are machined;
step 7, after the outer circles of the rotor end ring and the rotor iron core are rotated to be processed by a vehicle, dynamic balance debugging of the rotor is carried out;
step 8, debugging the concentricity of the stator sleeve;
step 9, assembling the rotor after dynamic balance debugging and the stator after concentricity debugging in a sleeving manner;
and step 10, mounting a sliding bearing and an end cover on the assembly body formed by sleeving the rotor and the stator in the step 9.
As a further improvement of the present invention, in step 1, after rough turning to before semi-finish turning, a finish turning tool is used to machine a datum line at a bearing stop of the motor shaft.
As a further improvement of the invention, in the step 2, the rotor core is laminated and assembled at the matching gear of the motor shaft, and the laminating pressure is within 5% higher than that required by the drawing; and testing the pressure again after the rotor core is locked within a range which is higher than 5% of the requirement of a drawing, and ensuring that the pressure is higher than 5% of the requirement of the drawing.
As a further improvement of the present invention, in step 3, after primary grinding, a dial indicator is used to check the run-out value of each gear, where the run-out value includes form and position tolerance, and when detecting the form and position tolerance, attention needs to be paid to whether the run-out high point directions at both ends are consistent, and if not, the run-out cumulative value at both ends should be less than or equal to 0.008 mm; in addition, when the jumping is detected, two or more high points appear on the same circular section, and the center hole is corrected again and then ground.
As a further improvement of the invention, in step 4, the rotor is fixed on a grinding machine, and the shaft extension gear, the bearing gear, the inner sealing gear and the outer sealing gear are secondarily ground.
As a further improvement of the invention, in the step 9, a rotor penetrating mode and a lifting position are selected according to the weight and the shaft diameter of the rotor, and a stator sleeve is penetrated; when the center height of a motor shaft is less than or equal to 630mm, a rotor is hung and penetrated by a single arm, a proper copper sleeve is selected according to the size of the shaft diameter during penetrating, the difference between the diameter of the copper sleeve and the shaft diameter of the motor shaft is less than or equal to 10mm, and the neutral position between a bearing gear and a matching gear is selected at the hoisting position; the center height of a motor shaft is larger than or equal to 710mm, a penetrating pipe is used for lifting and penetrating a rotor, a proper copper sleeve is selected according to the size of the shaft diameter during penetrating and installing, the difference between the diameter of the sleeve and the shaft diameter is smaller than or equal to 10mm, two ends of the rotor need to be wrapped by 5mm rubber pads, and the positions of two bearing blocks are selected at the lifting position.
As a further improvement of the present invention, in the step 10, before the upper bearing seat of the sliding bearing is screwed, the traveling disk is used to rotate the rotor for 5-6 turns, and after the sliding bearing is self-aligned, the upper bearing seat of the sliding bearing is screwed.
The invention has the beneficial effects that:
according to the invention, through rationalizing the processing and assembling sequence, the vibration risk of the motor shaft is reduced in many aspects, the radial displacement of the shaft is reduced, the operation stability of the motor is improved, and the service life of the motor is prolonged.
Drawings
FIG. 1 is a diagram of the assembly steps of the present invention.
Fig. 2 is a schematic view of a motor shaft of the present invention.
Fig. 3 is a schematic view of a rotor of the present invention.
Fig. 4 is a schematic view of the rotor hoisting of the present invention.
Fig. 5 is a general view of the assembled rotor and stator of the present invention.
Description of reference numerals: 1. a bearing stop; 2. matching the gears; 3. a rotor core; 4. detecting an iron core ventilation channel; 5. a rotor conducting bar; 6. a rotor end ring; 7. a shaft-falling type guard ring; 8. shaft extension gear; 9. an inner seal rail; 10. an outer seal rail; 11. single-arm hanging; 12. a copper sleeve; 13. threading a pipe; 14. a rubber pad; 15. an end cap; 16. a sliding bearing.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
as shown in the figure, the machining and assembling process for reducing the radial displacement of the motor shaft comprises the following steps:
step 1, a motor shaft adopts the processing technology of rough turning, semi-finish turning and primary grinding;
firstly, a motor shaft is fixed, rough turning is carried out on the motor shaft, redundant materials are removed as far as possible, machining efficiency is improved, then precision of a workpiece is guaranteed through semi-finish turning, parameter requirements of the process are met, no matter how much or little the machining allowance of the material of the motor shaft needs to be executed according to the process, on one hand, proper machining efficiency can be guaranteed, on the other hand, machining stress can be reduced, machining stress deformation of the shaft is reduced, machining precision is improved, stability of rotor operation is improved, and axial radial displacement of the motor during operation is reduced.
In order to improve the processing efficiency, the roughly turned rear shaft stands for 24 hours in a free state to reduce the internal stress generated during rough turning (the processing time can be greatly reduced due to rough turning and then finish turning, the standing time only affects the assembly efficiency, and details are not repeated herein), the turning machine is used for semi-finish turning the rotating shaft, then a datum line is processed by a finish-turned turning tool at a bearing stop 1 of the motor shaft, a datum line is provided for processing of each subsequent process, and finally the grinding machine is used for grinding a matching stop 2 of the motor shaft and the rotor core for the first time.
The grinding of the motor shaft is finished in two times, before secondary grinding, the shaft extension gear 8, the bearing gear 1 and the inner and outer sealing gears need to be firstly ground for one time, and secondary grinding is carried out after the rotor iron core 3 is laminated and the rotor end ring 6 is welded.
Step 2, iron core lamination assembly of the motor shaft and deflection adjustment of an air duct of the iron core; laminating and assembling the rotor core 3 at a matching gear of the motor shaft, wherein the laminating pressure is higher than the requirement of a drawing by within 5%; testing the pressure again after the rotor core 3 is locked within a range which is higher than 5% of the drawing requirement, ensuring that the pressure is higher than 5% of the drawing requirement, and adjusting deflection of the ventilation duct;
according to the drawing requirement, the C-shaped caliper gauge is used for controlling the deviation of each group of punching sheets of the iron core to be +/-0.5 mm, reasonable prepressing times are adopted according to the drawing length, the pressurizing pressure of the rotor iron core 3 is higher than the drawing requirement by 5%, the connecting screw rods of the upper pressing plate and the lower pressing plate of the rotor iron core 3 are locked in a pressure maintaining state, the pressure of the press is checked after the screw rods are locked, and the pressure is ensured to be higher than the drawing requirement by 5%. Before the deflection adjustment of the ventilation duct is carried out, the circumference of the rotor core 3 is retested, the length sizes of four points are selected to measure the deviation, the deviation is controlled within the range of 1mm, and then the rotor core 3 is fixed with a heating sleeve shaft; the deflection adjustment of the ventilation duct of the rotor core 3 is carried out next to the rotor core, because the rotor is stamped burrs and deformed, factors such as deformation of ventilation groove plates exist, the deflection of the ventilation duct is easy to be overlarge after the rotor is laminated, unstable factors are increased when the rotor runs, and the deflection of the ventilation duct of the iron core must be controlled within 2 mm.
Step 3, installing a rotor guide bar 5 and welding a rotor end ring 6; after the deflection of the iron core ventilation duct 4 is corrected, a rotor guide bar 5 is installed and a rotor end ring 6 is welded; and a silver-copper welding rod is used between the rotor end ring 6 and the rotor conducting bar 5 for intermediate frequency welding, so that a welding heat affected zone is reduced. A welding groove is processed on the rotor end ring 6, so that the welding seams of the cage bars and the end ring are full during welding, the firmness of the welding position is ensured, the stability of the rotor during high-speed rotation is improved, and a motor shaft and the rotor iron core 3 are matched to form the rotor;
step 4, carrying out secondary grinding processing on the rotor; after the rotor guide bar 5 and the welded rotor end ring 6 are welded, the rotor is fixed on a grinding machine, and a shaft extension gear 8, a bearing gear 1, an inner sealing gear 9 and an outer sealing gear 10 are ground by taking a reference line reserved during finish turning as a reference. After grinding, a dial gauge is needed to check the runout of each gear, the dial gauge is needed to be put at the position close to the edge of each gear when checking the runout, the poor runout missing detection caused by the incomplete corner of a grinding wheel is prevented, whether the directions of high points of two ends runout are consistent or not (the angles of the positions of the high points of the two ends in the circumferential direction are within 45 degrees) needs to be noticed when detecting the form and position tolerance, and if the directions of the high points of the two ends are inconsistent, the cumulative value of the runout of the two ends is less than or equal to 0.008 mm; in addition, when the jumping is detected, two or more high points cannot appear on the same circular section, if two or more high points appear, the central hole is in a problem, and the central hole needs to be corrected again and then ground.
And (4) checking the concentricity of each gear on the rotor by using a grinding machine, such as a rotating shaft extension gear, a bearing gear and an inner and outer sealing gear which are not subjected to abnormal grinding. The rotor is laminated or is probably caused slight axle deformation and machined surface roughness to reduce in the transportation, can avoid above-mentioned problem in the regrinding course of working after the rotor is laminated, improves rotor surface roughness and geometric tolerance, improves rotor stability when moving, reduces vibration and axle radial displacement.
Step 5, correcting the rotor and performing mirror finishing by adopting Haokay equipment; carefully checking and cleaning a bearing gear 1, an inner sealing gear 9 and an outer sealing gear 10 and ensuring clean cleaning, and turning and correcting a rotor on a lathe to ensure that each processing gear of the rotor jumps within 0.02 mm; the machining equipment of the Hakken energy is arranged for mirror surface machining, the surface performance of the metal can be effectively improved, and related tests show that the microhardness, the wear resistance, the fatigue strength and the fatigue life of the metal surface can be effectively improved by utilizing the metal surface machined by the Hakken energy. Tests of metal samples show that the machined surface after the Hakken machining is obviously different from the unprocessed surface, the surface roughness after the machining is obviously improved, and the surface roughness of a workpiece after the Hakken machining is improved from Ra value of 0.8 to Ra value of 0.15 (the roughness value after the machining is ensured to be below Ra0.2). The hardness of the metal surface after the Haoke processing is increased from 120 to 160 (Vickers hardness HV 0.2). The reduction of roughness can effectively reduce the radial displacement of axle, and the promotion of axle surface performance can prolong an axle life, and product quality stability also can promote.
Step 6, mounting a shaft falling type guard ring on a guard ring fixing key groove of the rotor, and machining the rotor end ring 6 and the excircle of the rotor iron core 3; after the bearing shelves 1 and the inside and outside sealed shelves of processing rotor, the epaxial guard ring fixed key groove of clearance, installation guard ring fixed key, consider to leave certain clearance between heat altered shape factor guard ring and the axle, need the clearance of inspection key and guard ring to meet the requirements after the guard ring installation, installation shaft falling formula guard ring carries out vehicle machining to the excircle rotation of rotor end ring 6 and rotor core 3, and its concrete process is as follows:
machining allowances are reserved on the outer circles of the rotor end ring 6 and the rotor core 3, the outer circles of the rotor end ring 6 and the rotor core 3 need to be machined, a shaft extension gear 8 needs to be additionally held during machining, copper sheets are padded under lathe clamping jaws to prevent the clamping jaws from damaging the shaft extension gear 8, and the outer circles of the rotor end ring 6 and the rotor core 3 are machined according to the size required by a drawing; the unbalance amount caused by the eccentricity of related parts can be reduced by lathing the end ring 5 and the excircle of the rotor, the difficulty of dynamic balance is reduced, the stability of the rotor is improved, and the vibration of the motor is reduced. After the excircle of the rotor is machined, the uniformity of an air gap can be better ensured, the stability of the rotor in operation is improved, and the radial displacement of a rotor shaft is reduced.
Step 7, debugging the dynamic balance of the rotor; after the rotor end ring 6 and the excircle of the rotor core 3 are rotated to be processed by a vehicle, a dynamic balance connector is arranged on the rotor to carry out dynamic balance debugging on the full-speed rotor; generally, the rotor is balanced at a low speed to ensure that a rotating shaft of the motor rotates stably, and the vibration of the motor is at a small level, but the design day of the existing machine tends to develop at a high speed, for example, the working rotating speed of the high-speed motor for a compressor exceeds a first-order critical rotating speed, the centrifugal force generated by unbalance of the rotor when the rotor operates at the working rotating speed and the counter force generated by the deflection deformation of the rotor exist, the rotor needs to be balanced on the high-speed balancing machine by a multi-plane influence coefficient method or a vibration mode balancing method, so that the rotor rotates stably at the working rotating speed, the vibration of the rotor is minimum, and the radial displacement of a shaft is controlled at a low level; the specific process is that a dynamic balance connector is installed on a rotor, and the rotor is subjected to dynamic balance at a rated rotating speed by using a high-speed dynamic balancing machine. The dynamic balance precision grade of the motor rotor is G2.5 according to related requirements issued by the international standardization organization, but according to actual working experience, the rotor adopts double-sided balance, and the vibration of the single-sided residual unbalance is controlled within 10G so as to meet ideal design and use requirements. The rigid rotor can be balanced at low speed, and the residual unbalance amount can be checked to be in a required range at high speed. The first-order critical rotating speed of the flexible rotor needs to be judged through a Berde diagram, and the speed displacement value at the first-order critical rotating speed needs to be controlled within a range of 1.5 mu m.
Step 8, debugging the sleeving concentricity of the stator; the higher the uniformity of the air gap of the motor is, the more stable the rotor rotates, the smaller the axial radial displacement is, and the concentricity of the sleeved stator is ensured to be less than or equal to 0.2mm according to experience. When the air gap of the motor is not uniform, the vibration and noise of the motor can be increased, and the early failure of the bearing can be caused when the air gap is serious. The uniformity of an air gap is improved, the unilateral magnetic pull force is reduced, the improvement of the running stability of a rotor is facilitated, the radial displacement of a motor shaft is reduced, and the vibration of the motor is reduced.
In order to achieve the purpose, before the rotor and the stator are sleeved (the stator, the base and the motor shell are assembled into a whole), a processing tolerance band is tightened in the aspect of part processing, the theoretical fit clearance of the base and a stator iron core is 0-0.15mm, and reasonable tolerance fit can be selected according to the numerical values. After the machine base and the stator core are processed, the machine base and the stator core must be turned over on a turnover machine or a soft surface platform made of wood or rubber and the like, so that the deformation of a workpiece caused by the turning-over impact force is reduced. Before the motor is assembled, the sleeving concentricity of the stator needs to be checked, and if the concentricity of the stator exceeds 0.2mm, the concentricity of the stator can be processed by turning the inner circle of the stator or adjusting the fit clearance between the stator and the machine base; the stator frame processing, handling process need pay special attention to the anti-deformation measure, through the improvement of spare part quality control horizontally improve the degree of consistency of motor air gap.
Step 9, assembling the rotor and the stator in a sleeved mode; selecting a way of penetrating and installing the rotor and a lifting position according to the weight and the shaft diameter of the rotor, and penetrating the stator sleeve; according to years of experience, the improper hoisting mode and hoisting position can cause the tolerance change of the shaft shape and position and increase the shaft bounce amount. When the weight of the motor is light, the rotor can be installed by selectively using the single-arm crane 11 when the center height of the motor shaft is less than or equal to 630mm, and the neutral position between the bearing gear 1 and the matching gear 2 is selected as the hoisting position shown in the attached figure 4; when the rotor is heavier, the center height of a motor shaft is larger than or equal to 710mm, the rotor needs to be mounted in a penetrating mode by using a penetrating pipe 13 in a lifting mode, a proper copper sleeve 12 is selected according to the size of the shaft diameter when the rotor is mounted in a penetrating mode, the difference between the diameter of the sleeve and the shaft diameter is smaller than or equal to 10mm, two ends of the rotor need to be wrapped by 5mm rubber pads 14, the positions of two bearing blocks 1 are selected as lifting positions, the gap between the penetrating pipe 13 and a lifting point needs to meet the requirements, and shaft deformation caused by lifting is reduced.
Step 10, after the rotor and the stator are threaded, firstly assembling a lower bearing seat of a sliding bearing 16 and an end cover 15 together, then installing the end cover 15, installing the sliding bearing 16 after the end cover 15 is installed in place, and screwing an upper bearing seat of the sliding bearing 16; the specific process is as follows: and (3) assembling the lower bearing seat of the sliding bearing 16 and the end cover 15 together, checking that the clearance between the lower part of the lower bearing seat and the end cover is less than 0.03mm, and if the requirement is not met, checking and processing are required. The upper and lower pads of the sliding bearing 16 need to be ground and the contact angle of the pads is corrected according to the actual state of the surface of the shaft, the colorant uses red powder, the motor with the rotating speed of more than 2500r/min requires that the bisector of the contact angle after the pads are ground is within the range of 30-35 degrees on both sides, the contact area is more than 75 percent, and the contact is carried out within the axial full-length range of the bearing gear. The motor with the rotating speed less than 2500r/min requires that the contact angle bisector has more uniform contact in the range of 35-45 degrees on both sides, the bearing blocks are contacted and continuously uninterrupted in the axial full-length range, and if the requirement is not met, the bearing is required to be scraped. After the processing is finished, the end cover 15 and the sliding bearing 16 are disassembled, the mounting end cover 15 is mounted on the stator, the sliding bearing 16 is mounted on the end cover 15 after the end cover 15 is mounted in place, the upper bearing seat is not tightened after the sliding bearing 16 is mounted, the upper bearing seat is screwed down after the sliding bearing 16 is self-aligned by 5-6 circles of the travelling crane disc rotor, and the motor assembly is finished.
The sliding bearing 16 requires lapping and contact angle correction during assembly. Because of the influence of the precision of the processing equipment of the sliding bearing 16 and the actual working state of the surface of the bearing retainer 1, the actual contact surface between the bearing and the shaft often cannot meet the application requirement, so that the matching and the correction of a contact angle are required during the assembly of the bearing, the good contact between the bearing bush and the shaft during the operation of the motor is achieved, the lubricating condition is improved, the stability of the operation of the shaft is improved, and the radial displacement of the shaft is reduced.

Claims (7)

1. A processing and assembling process for reducing radial displacement of a motor shaft is characterized by comprising the following steps:
step 1, a motor shaft sequentially adopts the processing technologies of rough turning, semi-finish turning and primary grinding;
step 2, after the motor shaft is subjected to primary grinding, iron core lamination assembly of the motor shaft and deflection adjustment of an air duct of a rotor iron core are carried out;
step 3, after the deflection of the ventilation duct is adjusted, installing a rotor guide bar (5) and welding a rotor end ring (6) to enable a motor shaft and a rotor iron core to be matched to form a rotor;
and 4, after the rotor guide bar (5) and the welded rotor end ring (6) are welded, carrying out secondary grinding on the rotor:
step 5, after the rotor is subjected to secondary grinding processing, rotor correction is carried out, and mirror finishing is carried out by adopting Haokay equipment;
step 6, after the rotor is processed by a mirror surface, a falling shaft type guard ring is arranged on the rotor, and the outer circles of the rotor end ring (6) and the rotor iron core (3) are processed by a traveling crane;
7, rotating the outer circles of the rotor end ring (6) and the rotor iron core (3) to carry out vehicle machining, and then carrying out dynamic balance debugging on the rotor;
step 8, debugging the sleeving concentricity of the stator;
step 9, assembling the rotor after dynamic balance debugging and the stator after concentricity debugging in a sleeving manner;
and step 10, mounting a sliding bearing (16) and an end cover (15) on the assembly body of the rotor and the stator which is obtained in the step 9 in a sleeved mode.
2. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein in the step 1, a datum line is machined at a bearing stop (1) of the motor shaft by using a finish turning tool after rough turning of the motor shaft to before semi-finish turning.
3. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein in the step 2, the rotor core is laminated and assembled at the matching gear (2) of the motor shaft, and the laminating pressure is higher than the requirement of the drawing by less than 5%; and after the rotor core is locked, the testing pressure is required to be higher than the range of 5% required by the drawing again, and the pressure is ensured to be higher than the range of 5% required by the drawing.
4. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein in the step 3, after one-time grinding, a dial indicator is used for checking the runout value of each gear, wherein the runout value comprises form and position tolerance, when the form and position tolerance is detected, attention needs to be paid to whether the directions of high points of runout at two ends are consistent, and if the directions of high points of runout at two ends are not consistent, the cumulative value of runout at two ends is less than or equal to 0.008 mm; in addition, when the jumping is detected, two or more high points appear on the same circular section, and the center hole is corrected again and then ground.
5. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein the step 4 is to fix the rotor on a grinding machine, and the secondary grinding is to machine the shaft extension rail (8), the bearing rail (1), the inner sealing rail (9) and the outer sealing rail (10).
6. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein in the step 9, a way of penetrating and installing the rotor and a lifting position are selected according to the weight and the shaft diameter of the rotor, and the stator is penetrated; when the center height of a motor shaft is less than or equal to 630mm, a single-arm crane (11) is used for penetrating and installing a rotor, a proper copper sleeve (12) is selected according to the size of the shaft diameter during penetrating and installing, the difference between the diameter of the sleeve and the shaft diameter of the motor shaft is less than or equal to 10mm, and the neutral position between a bearing gear (1) and a matching gear (2) is selected at the hoisting position; when the center height of a motor shaft is larger than or equal to 710mm, a penetrating pipe (13) is used for lifting and penetrating a rotor, a proper copper sleeve (12) is selected according to the size of the shaft diameter during penetrating, the difference between the diameter of the sleeve and the shaft diameter is smaller than or equal to 10mm, two ends of the rotor need to be wrapped by rubber pads (14) of 5mm, and the positions of two bearing blocks (1) are selected at the lifting position.
7. The machining and assembling process for reducing the radial displacement of the motor shaft as claimed in claim 1, wherein in the step 10, the traveling crane disk is used to rotate the rotor for 5-6 turns before the upper bearing seat of the sliding bearing (16) is tightened, and the upper bearing seat of the sliding bearing (16) is tightened after the sliding bearing (16) is self-aligned.
CN202210559974.8A 2022-05-19 2022-05-19 Machining and assembling process for reducing radial displacement of motor shaft Pending CN115001226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210559974.8A CN115001226A (en) 2022-05-19 2022-05-19 Machining and assembling process for reducing radial displacement of motor shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210559974.8A CN115001226A (en) 2022-05-19 2022-05-19 Machining and assembling process for reducing radial displacement of motor shaft

Publications (1)

Publication Number Publication Date
CN115001226A true CN115001226A (en) 2022-09-02

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ID=83026483

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210559974.8A Pending CN115001226A (en) 2022-05-19 2022-05-19 Machining and assembling process for reducing radial displacement of motor shaft

Country Status (1)

Country Link
CN (1) CN115001226A (en)

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