CN116618969A - Processing technology for grinding outer circle of motor rotor - Google Patents
Processing technology for grinding outer circle of motor rotor Download PDFInfo
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- CN116618969A CN116618969A CN202310798126.7A CN202310798126A CN116618969A CN 116618969 A CN116618969 A CN 116618969A CN 202310798126 A CN202310798126 A CN 202310798126A CN 116618969 A CN116618969 A CN 116618969A
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- 238000012545 processing Methods 0.000 title description 12
- 238000005516 engineering process Methods 0.000 title description 6
- 238000007514 turning Methods 0.000 claims abstract description 70
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 abstract description 27
- 230000003137 locomotive effect Effects 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The application relates to the technical field of electric locomotive machining, and discloses a motor rotor excircle grinding machining process, which comprises the following steps of: step one, coarsely grinding a rotating shaft feedback position and finely grinding the rotating shaft feedback position in sequence until the required size is reached; step two, sequentially rough grinding the rotating shaft iron core position and fine grinding the rotating shaft iron core position to the required size; step three, heating the cast aluminum rotor in sequence, and embedding a rotating shaft into the cast aluminum rotor in a hot sleeve manner to meet the requirement of embedding the shaft; finish turning the cast aluminum rotor to a required size; step five, sequentially rough grinding the second bearing position of the rotating shaft and fine grinding the second bearing position of the rotating shaft to the required size; step six, sequentially rough grinding the first bearing position of the rotating shaft and fine grinding the first bearing position of the rotating shaft to the required size; step seven, sequentially coarsely grinding the shaft extension position of the rotating shaft and finely grinding the shaft extension position of the rotating shaft to the required size; the improved process is used for solving the technical problems that the coaxiality of the bearing position and the shaft extension position of the rotating shaft is poor, the surface of the rotating shaft is scratched, and the overall quality of the rotor is affected in the existing rotor excircle grinding process.
Description
Technical Field
The application relates to the technical field of electric locomotive machining, in particular to a motor rotor excircle grinding machining process.
Background
Turning, namely grinding, of the outer circle of the motor rotor is an essential machining procedure in the production process of the motor rotor. Specifically, the motor rotor comprises a cast aluminum rotor and a rotating shaft, and the surfaces of the cast aluminum rotor and the rotating shaft are polished, namely, the surfaces of the cast aluminum rotor and the rotating shaft are turned and ground to be smooth in the production process, so that the concentricity of the outer circle of the cast aluminum rotor and the rotating shaft and the roundness of the cast aluminum rotor reach the standard; after the motor rotor subjected to turning and excircle grinding is integrally assembled with the stator, the friction force born by the rotor in the stator can be reduced, so that the rotation efficiency of the rotor is improved, the service life of the rotor is prolonged, the air gap between the rotor and the stator is ensured to be more uniform, and the motor noise and vibration can be restrained.
The processing flow of the traditional motor rotor is as follows: blanking, turning a rotating shaft, grinding the rotating shaft, heating the cast aluminum rotor, hot sleeving the cast aluminum rotor for embedding the shaft, finely turning the cast aluminum rotor, dynamically balancing the rotor and warehousing. In the technical process, the cast aluminum rotor is heated and expanded, the inner hole of the cast aluminum rotor is enlarged, the grinded rotating shaft is placed in the cast aluminum rotor, after cooling, the rotating shaft and the cast aluminum rotor are firmly embedded together due to interference fit, but the grinded whole rotating shaft is heated and then deformed, so that the coaxiality of the bearing position and the shaft extension position of the rotating shaft is poor, and the technical requirement of a high-rotating-speed motor cannot be met: the shaft extension runout is smaller than 0.008mm, and the rejection rate of the rotor processed by the process is about 40%.
In addition, the turning grinds the in-process inevitably can produce the iron fillings that splash, after the cast aluminum rotor hot jacket inlays the axle, because the pivot only has the mid portion to arrange cast aluminum rotor inner chamber in, and other parts expose, when carrying out the rotor smart car, the iron fillings can fly to the pivot that grinds and expose the part, will wipe the surface that exposes like this, destroys the smoothness, influences motor rotor overall quality, not only leads to the assembly difficulty, still can increase motor's noise.
Disclosure of Invention
The application aims to provide a motor rotor external grinding processing technology which is used for solving the technical problems that the coaxiality of a bearing position and a shaft extension position of a rotating shaft is poor, the surface of the rotating shaft is scratched, and the overall quality of a rotor is affected in the existing rotor external grinding technology.
The basic scheme provided by the application is as follows: the motor rotor excircle grinding processing technology is carried out according to the sequence of the first stage excircle grinding of the rotating shaft, the finish turning of the cast aluminum rotor and the second stage excircle grinding of the rotating shaft; the first-stage grinding of the outer circle of the rotating shaft comprises the following steps:
step one, coarsely grinding a rotating shaft feedback position and finely grinding the rotating shaft feedback position in sequence until the required size is reached;
step two, sequentially rough grinding the rotating shaft iron core position and fine grinding the rotating shaft iron core position to the required size;
after finishing the outer circle grinding of the first stage of the rotating shaft, carrying out finish turning of the cast aluminum rotor, and comprises the following steps:
step three, heating the cast aluminum rotor in sequence, and embedding a rotating shaft into the cast aluminum rotor in a hot sleeve manner to meet the requirement of embedding the shaft;
finish turning the cast aluminum rotor to a required size;
after finishing the finish turning cast aluminum rotor, carrying out the second stage external grinding of the rotating shaft, and comprises the following steps:
step five, sequentially rough grinding the second bearing position of the rotating shaft and fine grinding the second bearing position of the rotating shaft to the required size;
step six, sequentially rough grinding the first bearing position of the rotating shaft and fine grinding the first bearing position of the rotating shaft to the required size;
step seven, roughly grinding the shaft extension position of the rotating shaft and finely grinding the shaft extension position of the rotating shaft in sequence until the required size is reached.
The working principle and the advantages of the application are as follows:
after the blanking and turning of the rotating shaft, the processing flow of grinding the outer circle of the traditional motor rotor is improved as follows: grinding the iron core position and the feedback position of the shaft, heating the cast aluminum rotor, hot sleeving the cast aluminum rotor to inlay the shaft, finely turning the cast aluminum rotor, grinding the bearing position and the shaft extension position of the shaft, grinding the excircle, and then carrying out dynamic balance and warehousing of the motor rotor; because the allowance is reserved during turning of the rotating shaft, the grinding of the bearing position and the shaft extension position is not carried out before the hot sleeve, but is carried out after the hot sleeve, and the improved processing technology can avoid the coaxiality deviation of the rotating shaft caused by the thermal deformation after the shaft is firstly ground and then the hot sleeve is carried out; meanwhile, when the rotor is finely turned after the shaft is inlaid in the hot sleeve, scrap iron flies to the ground exposed part of the rotating shaft, the exposed surface is rubbed, the smoothness is damaged, the coaxiality of the bearing position and the shaft extension position of the rotating shaft is improved, the overall quality of the motor rotor is improved, the rejection rate of the rotor is reduced, the assembly easiness is improved, and the noise of the motor is reduced.
Further, the rotating shaft also comprises an a position, a b position, a c position, a d position, an e position and an f position, and no outer circle is ground after turning.
The beneficial effects are that: after the rotating shaft is machined, the rotating shaft is required to be assembled with a cast iron rotor to form a motor rotor, then the motor rotor and a motor stator are integrally assembled, long-time assembly shows that a position a, a position b, a position c, a position d, a position e and a position f of the rotating shaft are not required to be assembled with the rotating shaft in the assembly process, the positions are only giving way, machining requirements can be met by turning, finish machining such as grinding of an outer circle is not required, therefore, the outer circle grinding process is reduced in the positions, the assembly and quality of the whole rotor are not influenced, and the machining efficiency can be effectively improved.
Further, the feeding speed of the rough grinding is 0.3mm/min, the grinding speed is 200mm/min, and the allowance of the fine grinding is 0.05mm. The feeding speed of the fine grinding is 0.15mm/min, and the grinding speed is 200mm/min; after accurate grinding, checking the size by using an outside micrometer, checking the taper by using a taper ring gauge, judging whether the required size is met, if so, carrying out the next step; if not, continuing to conduct fine grinding.
The beneficial effects are that: and proper speed is set according to the comprehensive consideration of the condition of the cutter and the workpiece material, so that the machining efficiency and the machining quality are ensured.
Further, the finish turning cast aluminum rotor is left with a finish turning allowance of 0.02mm after rough turning, the finish turning cutting speed is 70mm/min, the feeding amount is 0.01mm, unidirectional cutting is performed from right to left, and after finish turning, the runout is measured by a dial indicator and is less than or equal to 0.005mm.
The beneficial effects are that: the machine tool is controlled according to the performance, the processing material, the allowance and the cutter requirement, the high rotation speed and the low feeding are realized, and the surface quality is improved.
Further, before the first stage of grinding the outer circle of the rotating shaft, the method further comprises the steps of turning the rotating shaft, keeping the finish turning allowance of 0.4mm and cutting speed: 130mm/min, finely turning the cutter 1, and measuring the jump with a dial gauge to be less than or equal to 0.02mm after turning. Before turning the rotating shaft, the method further comprises shaft material tempering, wherein the mechanical properties of the tempered shaft material are as follows: tensile strength sigma b is more than or equal to 900N/mm, yield strength sigma s is more than or equal to 650N/mm, elongation delta 5 is more than or equal to 15%, and area shrinkage rateThe impact energy alpha k is more than or equal to 49J/cm.
The beneficial effects are that: the quality of raw materials directly influences the processing quality of the rotating shaft, so that the quality of a ground basic workpiece is ensured from blanking and turning, and the processing quality of grinding is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a rotating shaft according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a motor rotor according to an embodiment of the present application.
Detailed Description
The following is a further detailed description of the embodiments:
the labels in the drawings of this specification include: shaft extension position 1, a position 2, first bearing position 3, b position 4, c position 5, iron core position 6, d position 7, second bearing position 8, e position 9, f position 10, feedback position 11, pivot 12, cast aluminum rotor 13.
In this embodiment, the motor rotor includes a cast aluminum rotor 13 and a rotating shaft 12, the cast aluminum rotor is a rotating body supported by the rotating shaft, and the cast aluminum rotor in the motor generally consists of a rotor core and an aluminum cage, and is an important component for high-speed rotation in power machines such as an electric motor, an engine, a gas turbine and the like.
Before grinding the outer circle, firstly blanking, and carrying out quenching and tempering treatment on the shaft material to obtain good comprehensive mechanical property, wherein the mechanical property after quenching and tempering is that the tensile strength sigma b is more than or equal to 900N/mm, the yield strength sigma s is more than or equal to 650N/mm, the elongation delta 5 is more than or equal to 15 percent, and the reduction of area is more than or equal toThe impact energy alpha k is more than or equal to 49J/cm, and high-frequency surface quenching or nitriding treatment is needed after tempering so as to improve the surface hardness and enhance the wear resistance.
After the shaft material meeting the requirements is prepared, fixing the shaft material of the rotating shaft on a machine tool, turning, removing redundant materials, performing finish turning after rough turning, ensuring the precision of a workpiece to reach the specified size and meeting the process requirements, in the embodiment, adopting a CK6152A numerical control lathe, and using the cutter as follows: rough turning of an outer circular cutter, finish turning of the outer circular cutter, boring of a hole cutter, chamfering of a chamfer cutter, center drilling and twist drilling. The feeding direction is one-way feeding from right to left, the finish turning allowance is 0.4mm, and the cutting speed is as follows: 130mm/min, finish turning and feeding the 1 cutter, measuring jump less than or equal to 0.02mm by using a dial indicator after turning is finished, and selecting the feeding direction according to the long and straight structure of the rotating shaft, so that the machining requirement can be rapidly met in a simple mode, and the turning quality is obviously improved. Under the condition of multiple working procedures, in order to improve the machining efficiency and ensure the machining precision, after the turning reaches the technological requirement, a datum line is machined by using a finish turning tool for finish turning at the first bearing position of the rotating shaft, and a datum is provided for the subsequent working procedure machining.
And (3) carrying out an excircle grinding stage after turning of the rotating shaft is completed, wherein the excircle grinding sequence of the whole motor rotor is that the excircle grinding stage is a first stage of the rotating shaft, the cast aluminum rotor is finely turned, and the excircle grinding stage is a second stage of the rotating shaft.
The outer circle grinding process has the advantages that the outer circle grinding process is divided into two stages, the first stage is before the cast aluminum rotor is hot sleeved and embedded with the rotating shaft, the second stage is after the rotor is finish turned, the outer circle grinding sequence of each part of the rotating shaft is accurately distinguished, the outer circle grinding sequence is matched with the outer circle grinding sequence of the cast aluminum rotor, the steps of the cast aluminum rotor and the outer circle grinding process of the rotating shaft are not affected, the machining precision is improved, and the rotor quality is guaranteed.
As shown in fig. 1: the rotating shaft is sequentially divided into a shaft extension position 1, an a position 2, a first bearing position 3, a b position 4, a c position 5, an iron core position 6, a d position 7, a second bearing position 8, an e position 9, an f position 10 and a feedback position 11 from left to right. In the embodiment, a Huadong numerical control MGK1320 precision cylindrical grinding machine is adopted.
The first stage of grinding the outer circle of the rotating shaft comprises the following steps:
step one, coarsely grinding a rotating shaft feedback position and finely grinding the rotating shaft feedback position in sequence until the required size is reached;
step two, sequentially rough grinding the rotating shaft iron core position and fine grinding the rotating shaft iron core position to the required size;
the first stage grinds feedback position and iron core position, generally grinds feedback position earlier, and the back grinds iron core position, and the iron core position is the position of pivot and cast aluminium rotor inlay cover, consequently must guarantee to reach the technological requirement, and smoothness is good, because grind the excircle and can produce the iron fillings, if grind the iron core position earlier, grind the feedback position again, can lead to grinding the iron fillings that produce when the feedback position and splash on the well iron core position, influence the processingquality at iron core position, there is the condition of retreating, waste time and energy, influence machining efficiency.
And taking a datum line reserved during finish turning as a benchmark, clamping two tops, clamping the shaft extension position of the rotating shaft by using a heart-shaped chuck to grind the shaft, and then grinding the outer circle of the rotating shaft in the first stage.
Specifically, firstly, roughly grinding a rotating shaft feedback position and finely grinding the rotating shaft feedback position in sequence until the required size is reached; in this embodiment, the feedback bit has a desired size, length of 15mm and diameter of 7.5mm; grinding the rotating shaft by using a grinding wheel, and roughly grinding the feeding speed: 0.3mm/min, rough grinding speed: 200mm/min, and the accurate grinding allowance is left: 0.05mm, fine grinding feed rate: 0.15mm/min, finish grinding speed: 200mm/min; after accurate grinding, checking the size by using an outside micrometer, checking the taper by using a taper ring gauge, meeting the drawing size requirement, and carrying out the next step; if the drawing size requirement is not met, other products are changed or scrapped, and the mode is the same in other steps.
Step two, sequentially rough grinding the rotating shaft iron core position and fine grinding the rotating shaft iron core position to the required size; in this embodiment, the core position of the 9101-model rotating shaft has a required size, a length of 85±0.5mm and a diameter of 47mm, and in other embodiments, L2 of the rotating shaft with different model may be 115, 160 or 225±0.5mm. The rough grinding and the fine grinding are the same as the first step, and are not described in detail herein.
After finishing the first-stage grinding of the excircle of the rotating shaft, finely turning the cast aluminum rotor, and comprises the following steps:
step three, heating the cast aluminum rotor in sequence, and embedding a rotating shaft into the cast aluminum rotor in a hot sleeve manner to meet the requirement of embedding the shaft;
finish turning the cast aluminum rotor to a required size;
specifically, as shown in fig. 2, step three, heating the cast aluminum rotor 13 in sequence, and shrink-fitting the cast aluminum rotor 13 with the rotating shaft 12; the pressure cast aluminum rotor is not preheated, the temperature after casting is lower, the shaft can be sleeved after the casting aluminum rotor is heated, in the embodiment, the diameter of the inner hole of the cast aluminum rotor is 47mm-0.02/0.04mm, the diameter of the iron core position on the shaft is 47mm+0.12/0.1mm, interference fit is carried out, the cast aluminum rotor is heated, the heating temperature is 300 ℃, and the thermal expansion of the inner hole of the cast aluminum rotor is increased after 3 hours. The shaft is inlaid by the hot jacket, which is a very simple and very important step, and the rotor quality is directly affected by the failure of the hot jacket, so that the process is required to be completed according to the process requirement, and whether the size of the shaft hole can meet the passing of the rotating shaft is detected; the time from the stop of the rotor heating to the insertion of the shaft should be shortened as much as possible, generally not more than 15 minutes; the rotating shaft penetrates into the shaft hole and is vertically inserted, and the feedback position of the rotating shaft is downwards arranged in the cast aluminum rotor; after the axial dimension is determined to be correct, the rotor and the rotating shaft are not touched before the rotor is cooled so as to prevent the dimension change, and the next step is carried out after the shaft is inlaid in the hot sleeve. And (5) directly finish turning the outer circle of the rotor without checking after cooling.
Finish turning the cast aluminum rotor to a required size; in the embodiment, the size of the cast aluminum rotor is precisely turned, and the diameter is 119+0.03mm; d position 7 of the rotor is clamped by using a heart chuck, finish turning is carried out by using two clamping heads, 2 cutters are used for finish turning the rotor, an outer circle cutter is roughly turned, and the finish turning allowance is reserved for 0.02mm after rough turning, and the cutting speed of finish turning is high: 70mm/min, feed: and (3) 0.01mm, carrying out unidirectional cutting from right to left, and after finish turning, checking whether the excircle of the rotor meets the drawing size requirement by using an outside micrometer. And measuring the jump less than or equal to 0.005mm by using a dial indicator, and carrying out the next step.
And grinding the outer circle of the rotating shaft at the second stage after finely turning the cast aluminum rotor, wherein the grinding comprises grinding a second bearing position, a first bearing position and a shaft extension position. The grinding is performed according to the sequence, because the second bearing position positioned on one side of the iron core position is firstly ground by the iron core position at the center position, and then the first bearing position and the shaft extension position positioned on the other side of the iron core position are ground, so that the grinding can be sequentially performed according to the position of the rotating shaft, the feeding is convenient, the position adjustment alignment of the sharpening back and forth movement is avoided, and the machining precision is ensured.
After finishing the finish turning cast aluminum rotor, carrying out the second stage external grinding of the rotating shaft, and comprises the following steps:
step five, sequentially rough grinding the second bearing position of the rotating shaft and fine grinding the second bearing position of the rotating shaft to the required size;
step six, sequentially rough grinding the first bearing position of the rotating shaft and fine grinding the first bearing position of the rotating shaft to the required size;
step seven, roughly grinding the shaft extension position of the rotating shaft and finely grinding the shaft extension position of the rotating shaft in sequence until the required size is reached.
Step five, sequentially rough grinding the second bearing position of the rotating shaft and fine grinding the second bearing position of the rotating shaft to the required size; in the embodiment, the second bearing position of the 9101 type rotating shaft has the required size, the length is 17mm, the diameter is 40mm, a chamfer angle of 1.5 x 45 degrees is arranged towards the e-position end, and the chamfer angle is completed when the axle is in use; after finishing the grinding process with the setting of the coarse grinding and fine grinding requirements, checking whether the size reaches the drawing requirement or not by using an outside micrometer, measuring the runout of less than or equal to 0.002mm by using a micrometer, and carrying out the next step.
Step six, sequentially rough grinding the first bearing position of the rotating shaft and fine grinding the first bearing position of the rotating shaft to the required size; in the embodiment, the first bearing position of the 9101 type rotating shaft has the required size, the length is 23mm, and the diameter is 40mm; and after finishing the grinding process with the setting of the coarse grinding and fine grinding requirements, carrying out the next step.
Step seven, roughly grinding the shaft extension position of the rotating shaft and finely grinding the shaft extension position of the rotating shaft in sequence until the required size is reached. In this embodiment, the required size of 9101 type pivot axle position, length is 80mm, and the diameter is 32mm, and the one end that keeps away from first bearing position has chamfer 2 45 degrees, and the chamfer is accomplished when the axletree. And after finishing the grinding process with the setting of the coarse grinding and fine grinding requirements, carrying out the next step.
It should be noted that the rotating shaft also comprises a bit a, b bit c, d bit e and f bit, and the outer circle is not ground. After the rotating shaft is machined, the rotating shaft is required to be assembled with a cast iron rotor to form a motor rotor, then the motor rotor and a motor stator are integrally assembled, long-time assembly shows that a position a, a position b, a position c, a position d, a position e and a position f of the rotating shaft are not required to be assembled with the rotating shaft in the assembly process, the positions are only giving way, machining requirements can be met by turning, finish machining such as grinding of an outer circle is not required, therefore, the outer circle grinding process is reduced in the positions, the assembly and quality of the whole rotor are not influenced, and the machining efficiency can be effectively improved.
And finally, measuring shaft extension runout after the motor is assembled, wherein the runout smaller than 0.008mm meets the requirements.
After the outer circle grinding of the motor rotor is finished, rotor dynamic balance test is carried out, and the dynamic balance function is to change the mass distribution of the rotor by a method of removing weight or adding counterweight on the rotor, so that the rotor vibration caused by the eccentric centrifugal force of the mass center or the dynamic load acting on the bearing is reduced to be within an allowable range, and the purpose of stable running of the engine is achieved.
In the prior art motor rotor machining process, a rotating shaft is ground between two working procedures of rotating shaft turning and cast aluminum rotor heating, and the mode of finishing the outer circle grinding machining of the whole rotating shaft at one time is adopted, so that the machining efficiency is improved, but under the machining mode, the fact that the outer circle grinding machining of the whole rotating shaft is finished before the cast aluminum rotor is heated is found in the practical assembly process, the rotating shaft is heated after the cast aluminum rotor is heated and inlaid, so that the coaxiality of a bearing position and a shaft extension position of the rotating shaft is poor, and the problem is generally solved by adopting other assembly processes for adjustment. The coaxiality of the rotating shaft of the motor is a very critical factor for the integral assembly and operation of the motor, so that the coaxiality error is further reduced and the essential problem is solved by reasonably optimizing the machining sequence, dividing the position of the rotating shaft into a part to be ground and a part not to be ground according to the assembly requirement, carrying out the grinding of each part to be ground of the rotating shaft and the rotor in stages, specifically, reasonably arranging the grinding sequences of each part of the rotating shaft and the rotor according to the assembly and assembly contact surface requirement of the rotating shaft and the cast iron rotor, adjusting the grinding sequences of the bearing position and the shaft extension position of the rotating shaft, and effectively solving the problem that the coaxiality variation of the bearing position and the shaft extension position of the rotating shaft and the external splash of scrap iron of each part are mutually influenced in the prior process mode; for parts which do not need to be ground, the processing procedures are reduced, and the processing efficiency is improved; meanwhile, the process modes of rough grinding, fine grinding and finish turning are improved, the machining efficiency is improved, the coaxiality of the rotor is guaranteed in multiple aspects, the smoothness of the surface of the outer circle of the rotating shaft after grinding is improved, the quality of the motor rotor is improved, the running stability of the motor is further improved, and the service life of the motor is prolonged.
The foregoing is merely an embodiment of the present application, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent.
Claims (7)
1. A motor rotor excircle grinding process is characterized by sequentially grinding an excircle in a first stage of a rotating shaft, finely turning a cast aluminum rotor and grinding the excircle in a second stage of the rotating shaft; the first-stage grinding of the outer circle of the rotating shaft comprises the following steps:
step one, coarsely grinding a rotating shaft feedback position and finely grinding the rotating shaft feedback position in sequence until the required size is reached;
step two, sequentially rough grinding the rotating shaft iron core position and fine grinding the rotating shaft iron core position to the required size;
after finishing the outer circle grinding of the first stage of the rotating shaft, carrying out finish turning of the cast aluminum rotor, and comprises the following steps:
step three, heating the cast aluminum rotor in sequence, and embedding a rotating shaft into the cast aluminum rotor in a hot sleeve manner to meet the requirement of embedding the shaft;
finish turning the cast aluminum rotor to a required size;
after finishing the finish turning cast aluminum rotor, carrying out the second stage external grinding of the rotating shaft, and comprises the following steps:
step five, sequentially rough grinding the second bearing position of the rotating shaft and fine grinding the second bearing position of the rotating shaft to the required size;
step six, sequentially rough grinding the first bearing position of the rotating shaft and fine grinding the first bearing position of the rotating shaft to the required size;
step seven, roughly grinding the shaft extension position of the rotating shaft and finely grinding the shaft extension position of the rotating shaft in sequence until the required size is reached.
2. The process for grinding the outer circle of the motor rotor according to claim 1, wherein the rotating shaft further comprises an a position, a b position, a c position, a d position, an e position and an f position, and the outer circle is not ground after turning.
3. The process for grinding outer circle of motor rotor according to claim 1, wherein the feeding speed of the rough grinding is 0.3mm/min, the grinding speed is 200mm/min, and the allowance of fine grinding is 0.05mm.
4. A process for grinding an outer circle of a motor rotor according to claim 3, wherein the feeding speed of the fine grinding is 0.15mm/min and the grinding speed is 200mm/min; after accurate grinding, the size is checked by an outside micrometer, the taper is checked by a taper ring gauge, the required size is met, and the next step is carried out.
5. The process for grinding the outer circle of the motor rotor according to claim 1, wherein the finish turning cast aluminum rotor is characterized in that the finish turning allowance is 0.02mm after rough turning, the finish turning cutting speed is 70mm/min, the feeding amount is 0.01mm, the one-way cutting is performed from right to left, and the runout is less than or equal to 0.005mm after finish turning, and is measured by a dial indicator.
6. The process for grinding the outer circle of the motor rotor according to claim 1, further comprising turning the rotating shaft before grinding the outer circle of the rotating shaft in the first stage, wherein the finish turning allowance is 0.4mm, and the cutting speed is: 130mm/min, finely turning the cutter 1, and measuring the jump with a dial gauge to be less than or equal to 0.02mm after turning.
7. The process for grinding an outer circle of a motor rotor according to claim 6, further comprising quenching and tempering the shaft material before turning the rotating shaft, wherein the quenched and tempered shaft material has mechanical properties of: tensile strength sigma b is more than or equal to 900N/mm, yield strength sigma s is more than or equal to 650N/mm, elongation delta 5 is more than or equal to 15%, and area shrinkage rateThe impact energy alpha k is more than or equal to 49J/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310798126.7A CN116618969A (en) | 2023-06-30 | 2023-06-30 | Processing technology for grinding outer circle of motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310798126.7A CN116618969A (en) | 2023-06-30 | 2023-06-30 | Processing technology for grinding outer circle of motor rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116618969A true CN116618969A (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310798126.7A Pending CN116618969A (en) | 2023-06-30 | 2023-06-30 | Processing technology for grinding outer circle of motor rotor |
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| CN (1) | CN116618969A (en) |
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2023
- 2023-06-30 CN CN202310798126.7A patent/CN116618969A/en active Pending
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