CN108747233A - A kind of processing technology of mechanical main shaft - Google Patents
A kind of processing technology of mechanical main shaft Download PDFInfo
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- CN108747233A CN108747233A CN201810421002.6A CN201810421002A CN108747233A CN 108747233 A CN108747233 A CN 108747233A CN 201810421002 A CN201810421002 A CN 201810421002A CN 108747233 A CN108747233 A CN 108747233A
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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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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Abstract
The invention belongs to axis processing technique field, more particularly to a kind of processing technology of mechanical main shaft.Concrete technology includes molding-modifier treatment-processing-Nitrizing Treatment, the present invention uses two sections of nitridation process of action of low-voltage pulse, using nitrogen and ammonia as nitrogen source, the mass ratio of both stringent control, ultralow negative pressure is used simultaneously, the thickness of nitriding layer is controlled, the nitriding layer finally obtained has excellent uniformity and compactness, to substantially increase the comprehensive mechanical property and wear-resisting property of main shaft.
Description
Technical field
The invention belongs to axis processing technique field, more particularly to a kind of processing technology of mechanical main shaft.
Background technology
In lathe, auto manufacturing, main shaft is its important power-transmitting part, often subjects bending, torsion, impact
The effect of load and fatigue, therefore axis is required to have higher comprehensive mechanical property；The position for bearing to rub also requires to have enough
Hardness and wearability.Part is mostly machined and is made, to take into account machinability and performance requirement, it is necessary to make
Rational processing technology is made to ensure the performance of lathe spindle various aspects.
In most cases, people are to study based on the hot and cold processing technology of main shaft, and have ignored the weight of its nitridation process
The property wanted.By Nitrizing Treatment during spindle processing, the nitriding layer of good compactness is formed in main shaft, which can be effective
Improve hardness, wearability, fatigue resistance and the anti-seizing property of main shaft.
Traditional nitridation process is ammonia to be inputted into nitriding furnace under certain temperature range, and kept for a period of time.
Chinese invention patent (CN104002111A) discloses a kind of nitridation process of central principal axis taper hole, specially in 520 DEG C of nitridings
20-25h inputs ammonia, and ammonia dissociation rate 15-25%, then in 540 DEG C of nitriding 6-10h, ammonia dissociation rate 45-65%, this is oozed
Though nitrogen technique can improve the fatigue resistance and corrosion resistance of spindle taper hole, it must be equipped with the bead of early period and can be only achieved
Good effect, furthermore, this nitridation process is suitable only for the steel alloy that material is 32Cr2MoV, for the steel alloy of other models
Performance does not have improvement result, especially 38CrMoAl steel alloys, and so just significantly limit the nitridation process uses model
It encloses.Therefore, there is an urgent need to develop the comprehensive performances that a kind of novel nitridation process is used to improve mechanical main shaft at present.
Invention content
The purpose of the present invention is being directed to the above-mentioned problems in the prior art, providing a kind of can improve mechanical main shaft synthesis
Mechanical property, the processing technology of wear-resisting property.
Object of the invention can be realized by the following technical scheme：A kind of processing technology of mechanical main shaft, including it is following
Step：
S1, molding：By alloy pig blanking, melting is molded roughcast；
S2, modifier treatment：Blank is subjected to modifier treatment；
S3, processing：Blank after modifier treatment is carried out to half finishing processing successively, finishing processing, half fine grinding, is bored
It cuts, finish-milling is processed, spline processing；
S4, Nitrizing Treatment：By the blank after processing first under action of low-voltage pulse effect in 530-550 DEG C of Nitrizing Treatment 8-12h,
Then in 570-600 DEG C of Nitrizing Treatment 5-8h, mechanical main shaft finished product is made, wherein nitriding furnace pressure is-(0.05-0.01)
MPa, nitrided case depth 0.08-0.12mm.
The nitrogen treatment stage of the present invention uses two sections of nitridation process under action of low-voltage pulse effect, first by Gas puffing and
The mode of pumping, the nitriding medium in nitriding furnace can be constantly updated, and avoid the occurrence of entrapped air volume so that each surface of main shaft can
It is contacted with fresh nitriding medium, and then obtains more uniform nitriding layer, meanwhile, pulse nitriding can reduce the pressure in nitriding furnace
Power forms the phenomenon that part deaerates, and this phenomenon makes the degree of porosity in main shaft surface compound layer reduce or disappear, in turn
Fine and close compound layer is formed, the wear-resisting property of main shaft is considerably increased.Meanwhile action of low-voltage pulse coordinates two sections of nitridation process that can have
Effect reduces the thickness of infiltration layer nitride layer, white layer, the first stage, first in 530-550 DEG C of Nitrizing Treatment 8-12h under action of low-voltage pulse effect, this
Stage nitriding in high nitrogen gesture atmosphere provides more activity using Gas puffing and air-breathing since the resolution ratio of nitriding medium is low
Nitrogen-atoms enables main shaft to obtain deeper diffusion layer, and second stage, in 570-600 DEG C of Nitrizing Treatment 5-8h, this stage is in low nitrogen
Nitriding in gesture atmosphere makes surface nitrogen concentration decline, reduces the formation of nitride net since the resolution ratio of nitriding medium is high, thus
The nitration case brittleness of acquisition is small, and mechanical property is good.If the present invention is using conventional nitridation process in the prior art, due to nitrogen and master
The metallic atom on axis surface has very strong affinity, the metal that fine and close nitriding layer will hinder going deep into for nitrogen, while be aoxidized
The fine and close oxidation film that atom is formed on main shaft surface also will hinder nitrogen inwardly to spread, therefore can lead to that nitriding speed is slow, infiltration layer
Thin, the problems such as surface layer is crisp and processing time is long.
In addition, nitriding furnace pressure of the present invention is-(0.05-0.01), active nitrogen in nitriding medium is helped to improve using negative pressure
Content, promote the diffusion of nitrogen-atoms to penetrate into, form uniform nitriding layer, and then improve the hardness of spindle material, it is crisp to reduce its
Property.The prior art usually carries out nitriding and obtains satisfactory nitriding layer under positive pressure, if but the present invention under positive pressure carry out
Nitriding, nitriding medium can rapidly enter in main shaft, and the thickness of nitriding layer is not easy to control, and the nitriding layer formed is uneven, and shadow
Ring the quality of main shaft finished product.
Preferably, in step s 4, the nitriding medium is nitrogen+ammonia, and the mass ratio of the two is 1：(1.5-5).With
The prior art is compared using single nitrogen source, and the present invention, as nitrogen source, not only reduces the crisp of nitride region using nitrogen+ammonia
Property, and infiltration rate is faster than the infiltration rate of single nitrogen source nitriding.The ratio of nitrogen and ammonia is also to weigh the weight of nitrogenizing effect in nitriding medium
Want index, the mass ratio of nitrogen and ammonia is less than 1 in the present invention：When 1.5, the activated nitrogen atom quantity that is formed in nitriding process compared with
It is few, the effect of depth nitriding is not achieved, and nitriding layer is uneven, but the two mass ratio is more than 1：When 5, layer surface centre
There is atrament, just because of the appearance of nitriding black layer so that nitrided layer hardness shows inhomogeneities.
Preferably, in step s 4, the mode of the action of low-voltage pulse is：35- is vacuumized after inflation 35-40min
40min.The present invention, which inflates pumpdown time control and fresh nitriding medium can be replenished in time and be effectively discharged in 35-40min, to be detained
Gas is conducive to the nitriding layer for obtaining even compact.It is typically chosen single nitrogen source in existing nitridation process, nitriding medium is not present
Between fusion, and entrapped air volume ingredient is single, therefore the time that impulse charge vacuumizes is typically less than 30min, if of the invention
Using general pulse mode, then the nitrogen in nitriding medium and ammonia cannot be sufficiently mixed, can be because oozing in nitriding process
The difference of nitrogen agent component and cause nitriding layer uneven, while be detained multiple gases can not effectively be discharged.
Preferably, in step s 2, the concrete technology of the modifier treatment is：It is heated to 320-350 DEG C/h rates
900-930 DEG C of heat preservation 180-240min, fills high purity inert gas, is cooled fast to 40-50 DEG C and comes out of the stove immediately after heat preservation；
600-650 DEG C of heat preservation 200-240min is heated to 350-380 DEG C/h rates again, fills high-purity indifferent gas after heat preservation immediately
Body is cooled fast to 40-50 DEG C and comes out of the stove.The present invention enables austenite fully to change by the mode being rapidly heated, and eliminates
Tissue defects are forged, being quickly cooled down makes spindle material tissue crystal grain refinement, substantially improves the material mechanical performance, and existing skill
More slow heating mode is generally used in art, using water cooling or the air-cooled type of cooling, if the present invention uses general tune
, then there is martensite and dotted ferritic structure, and nonuniform organization in matter treatment process in spindle material, crystal grain occurs for martensite
Fusion, forms big massive texture and influences requirement of the spindle material to toughness, intensity and hardness.
Preferably, in step s3, the concrete technology of half finishing processing is：Size, holes drilled through, the vehicle conical surface, cone
Each hole of big end surface is bored in hole, and outer circle reserves the allowance of 3mm-5mm, and the vehicle conical surface reserves the allowance of 0.6mm-1mm,
The allowance of remaining reserved 0.3mm-0.5mm, overall surface roughness are 0.5-0.7mm.
Preferably, in step s3, the concrete technology of half fine grinding is：Half fine cylindrical, taper hole, outer circle are reserved
The allowance of 1mm-2mm, taper hole reserve the allowance of 0.4mm-0.6mm.The present invention increases by half before main shaft nitrogenizes and refines
The technique of outer circle and taper hole controls the allowance of outer circle and taper hole in suitable range, is refined after being effectively guaranteed nitridation
The removal amount of nitration case when outer circle and taper hole, and then improve the processing quality of main shaft.
Preferably, in step sl, the component and mass percent of alloy pig are：C：0.2-0.5%, Si：0.1-
0.3%, Mn：0.05-0.6%, Al：0.8-2%, Cr：1.2-2.5%, Ni：0.01-0.08%, Mo：0.15-0.8%, surplus
For Fe and inevitable impurity.
The presence of alloying elements cr, Al, Mo can be obviously improved the nitriding layer hardness of main shaft in alloy pig of the present invention, because removing
In nitride layer, white layer there is the nitride of alloying element except, in diffusion layer there are many more be in Dispersed precipitate alloy nitride
(Mo2N、AlN、Cr2N etc.), it can play dispersion hardening, significantly improve the hardness of nitride layer, white layer and diffusion layer.A small amount of manganese is deposited
In addition to that can purify aluminium alloy in melting, in subsequent nitridation process with nitrogen-atoms reciprocation shape occurs for crystal grain thinning
At Mn2N、Mn5N2Phase can greatly improve the corrosion resistance of spindle material.
Further preferably, the component and mass percent of alloy pig are：C：0.35-0.45%, Si：0.2-0.3%, Mn：
0.3-0.5%, Al：0.8-1.2%, Cr：1.4-2%, Ni：0.01-0.04%, Mo：0.15-0.25%, surplus is for Fe and not
Evitable impurity.The alloy pig of the component and mass percent includes 38CrMoAl alloy pigs.
Compared with prior art, the invention has the advantages that：
1. the present invention carries out two sections of nitridation process under action of low-voltage pulse effect, and with nitrogen and ammonia for dual nitrogen source,
While improving nitriding rate increase depth of nitration, the uniformity and compactness of nitriding layer are further promoted, to substantially increase
The mechanical property and wear-resisting property of main shaft.
2. processing technology of the present invention is simply easily operated, high precision machining, principal shaft product is high-quality, is suitable for industrial metaplasia
Production.
Specific implementation mode
The following is specific embodiments of the present invention, and illustrates that technical scheme of the present invention will be further described, but this
Invention is not limited to these examples.
Embodiment 1
A kind of processing technology of mechanical main shaft, including following preparation process：
It is by component and mass percent：C：0.35%, Si：0.2%, Mn：0.25%, Al：1.3%, Cr：1.8%,
Ni：0.004%, Mo：0.23%, surplus is the alloy pig blanking of Fe and inevitable impurity, the melting at 1050 DEG C, then
It is pressed into blank；
Blank is heated to 920 DEG C of heat preservation 210min with 335 DEG C/h rates, fills high-purity indifferent gas after heat preservation immediately
Body is cooled fast to 45 DEG C and comes out of the stove；625 DEG C of heat preservation 220min are heated to 365 DEG C/h rates again, are filled immediately after heat preservation
High purity inert gas is cooled fast to 45 DEG C and comes out of the stove；
Blank after modifier treatment is carried out to half finishing processing successively, finishing processing, half fine grinding, drilling, finish-milling add
Work, spline processing, wherein half finishing processing technique is：Size, the vehicle conical surface, taper hole, bores each hole of big end surface at holes drilled through,
Outer circle reserves the allowance of 4mm, and the vehicle conical surface reserves the allowance of 0.8mm, the allowance of remaining reserved 0.4mm is whole
Surface roughness is 0.6mm, and half fine grinding technology is：Outer circle, taper hole, outer circle reserve the allowance of 1.5mm, and taper hole is reserved
The allowance of 0.5mm；
By the blank after processing first under action of low-voltage pulse in 540 DEG C of Nitrizing Treatment 10h, then in 585 DEG C of Nitrizing Treatment 6h,
Mechanical main shaft finished product is made, wherein nitriding furnace pressure is -0.03MPa, and nitrided case depth 0.1mm, nitriding medium is that mass ratio is
1：3.5 nitrogen and ammonia, the mode of action of low-voltage pulse are：35min is vacuumized after inflation 35min.
Embodiment 2
With differing only in for embodiment 1, the component and mass percent of the present embodiment alloy pig are：C：0.4%, Si：
0.2%, Mn：0.15%, Al：1%, Cr：2%, Ni：0.003%, Mo：0.2%, surplus is Fe and inevitable impurity
Embodiment 3
With differing only in for embodiment 1, the component and mass percent of the present embodiment alloy pig are：C：0.2%, Si：
0.1%, Mn：0.05%, Al：0.8%, Cr：1.2%, Ni：0.001%, Mo：0.15%, surplus be Fe and inevitably it is miscellaneous
Matter
Embodiment 4
With differing only in for embodiment 1, the component and mass percent of the present embodiment alloy pig are：C：0.5%, Si：
0.3%, Mn：0.4%, Al：2%, Cr：2.5%, Ni：0.008%, Mo：0.3%, surplus is Fe and inevitable impurity
Embodiment 5
With differing only in for embodiment 1, blank is heated to 910 DEG C of heat preservations by the present embodiment with 340 DEG C/h rates
200min fills high purity inert gas immediately after heat preservation, be cooled fast to 47 DEG C and come out of the stove；It is heated again with 360 DEG C/h rates
To 620 DEG C of heat preservation 230min, high purity inert gas is filled after heat preservation immediately, 47 DEG C is cooled fast to and comes out of the stove.
Embodiment 6
With differing only in for embodiment 1, blank is heated to 900 DEG C of heat preservations by the present embodiment with 320 DEG C/h rates
180min fills high purity inert gas immediately after heat preservation, be cooled fast to 40 DEG C and come out of the stove；It is heated again with 350 DEG C/h rates
To 600 DEG C of heat preservation 200min, high purity inert gas is filled after heat preservation immediately, 40 DEG C is cooled fast to and comes out of the stove.
Embodiment 7
With differing only in for embodiment 1, blank is heated to 930 DEG C of heat preservations by the present embodiment with 350 DEG C/h rates
240min fills high purity inert gas immediately after heat preservation, be cooled fast to 50 DEG C and come out of the stove；It is heated again with 380 DEG C/h rates
To 650 DEG C of heat preservation 240min, high purity inert gas is filled after heat preservation immediately, 50 DEG C is cooled fast to and comes out of the stove.
Embodiment 8
With differing only in for embodiment 1, half finishing processing technique of the present embodiment is：Size, holes drilled through, vehicle cone
Face, taper hole bore each hole of big end surface, and outer circle reserves the allowance of 3mm, and the vehicle conical surface reserves the allowance of 0.6mm, remaining is pre-
It is 0.5 to stay the allowance of 0.3mm, overall surface roughness, and half fine grinding technology is：Outer circle, taper hole, outer circle reserve adding for 1mm
Spare time measures, and taper hole reserves the allowance of 0.4mm；
Embodiment 9
With differing only in for embodiment 1, half finishing processing technique of the present embodiment is：Size, holes drilled through, vehicle cone
Face, taper hole bore each hole of big end surface, and outer circle reserves the allowance of 5mm, and the vehicle conical surface reserves the allowance of 1mm, remaining is reserved
The allowance of 0.5mm, overall surface roughness are 0.7mm, and half fine grinding technology is：Outer circle, taper hole, outer circle reserve adding for 2mm
Spare time measures, and taper hole reserves the allowance of 0.6mm；
Embodiment 10
With differing only in for embodiment 1, the present embodiment is by the blank after processing first under action of low-voltage pulse in 535 DEG C of nitridings
9h is handled, then in 590 DEG C of Nitrizing Treatment 7h, mechanical main shaft finished product is made, wherein nitriding furnace pressure is -0.02MPa, nitriding
Layer thickness is 0.09mm, and nitriding medium is that mass ratio is 1：4 nitrogen and ammonia, the mode of action of low-voltage pulse are：It is taken out after inflation 32min
Vacuum 32min.
Embodiment 11
With differing only in for embodiment 1, the present embodiment is by the blank after processing first under action of low-voltage pulse in 530 DEG C of nitridings
8h is handled, then in 570 DEG C of Nitrizing Treatment 5h, mechanical main shaft finished product is made, wherein nitriding furnace pressure is -0.05MPa, nitriding
Layer thickness is 0.08mm, and nitriding medium is that mass ratio is 1：1.5 nitrogen and ammonia, the mode of action of low-voltage pulse are：After inflating 30min
Vacuumize 30min.
Embodiment 12
With differing only in for embodiment 1, the present embodiment is by the blank after processing first under action of low-voltage pulse in 550 DEG C of nitridings
12h is handled, then in 600 DEG C of Nitrizing Treatment 8h, mechanical main shaft finished product is made, wherein nitriding furnace pressure is -0.01MPa, nitriding
Layer thickness is 0.12mm, and nitriding medium is that mass ratio is 1：5 nitrogen and ammonia, the mode of action of low-voltage pulse are：It is taken out after inflation 40min
Vacuum 40min.
Embodiment 13
With differing only in for embodiment 1, the present embodiment nitriding medium is that mass ratio is 1：1.2 nitrogen and ammonia.
Embodiment 14
With differing only in for embodiment 1, the present embodiment nitriding medium is that mass ratio is 1：6 nitrogen and ammonia.
Embodiment 15
With differing only in for embodiment 1, the present embodiment nitriding medium is nitrogen.
Embodiment 16
With differing only in for embodiment 1, the present embodiment nitriding medium is ammonia.
Embodiment 17
With differing only in for embodiment 1, the present embodiment action of low-voltage pulse mode vacuumizes 20min after being inflation 20min.
Embodiment 18
Thickness with differing only in for embodiment 1, the present embodiment nitriding layer is 0.05mm.
Embodiment 19
Thickness with differing only in for embodiment 1, the present embodiment nitriding layer is 0.15mm.
Comparative example 1
Using conventional nitridation process in the prior art.
It is tested for the property that the results are shown in Table 1 to the mechanical main shaft described in embodiment 1-19 and comparative example 1.
Table 1：The performance test results of mechanical main shaft in embodiment 1-19 and comparative example 1
In summary factor, present invention effect are：Two sections of nitridation process of progress under action of low-voltage pulse effect, and with
Nitrogen and ammonia are dual nitrogen source, while improving nitriding rate increase depth of nitration, further promote the uniformity of nitriding layer
And compactness, to substantially increase the mechanical property and wear-resisting property of main shaft, while the nitridation process is not limited to single type
Number material.
This place embodiment is in place of the claimed non-limit of technical scope midrange and in embodiment technology
In scheme to single or multiple technical characteristics it is same replacement be formed by new technical solution, equally all the present invention claims
In the range of protection, and between the parameter that is related to of the present invention program if not otherwise specified, then there is no can not between each other
The unique combinations of replacement.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or supplement to described specific embodiment or substitute by a similar method, but simultaneously
The spirit or beyond the scope defined by the appended claims of the present invention is not deviated by.
It is skilled to this field although present invention has been described in detail and some specific embodiments have been cited
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of processing technology of mechanical main shaft, which is characterized in that include the following steps：
S1, molding：By alloy pig blanking, melting is molded roughcast；
S2, modifier treatment：Blank is subjected to modifier treatment；
S3, processing：Blank after modifier treatment is carried out to half finishing processing, finishing processing, half fine grinding, drilling, essence successively
Milling Machining, spline processing；
S4, Nitrizing Treatment：By the blank after processing first under action of low-voltage pulse in 530-550 DEG C of Nitrizing Treatment 8-12h, then exist
Mechanical main shaft finished product is made in 570-600 DEG C of Nitrizing Treatment 5-8h, and wherein nitriding furnace pressure is-(0.05-0.01) MPa, nitriding
Layer thickness is 0.08-0.12mm.
2. the processing technology of mechanical main shaft according to claim 1, which is characterized in that Nitrizing Treatment described in step S4
Nitriding medium is nitrogen+ammonia, and the mass ratio of the two is 1：(1.5-5).
3. the processing technology of mechanical main shaft according to claim 1, which is characterized in that action of low-voltage pulse described in step S4
Mode is：30-40min is vacuumized after inflation 30-40min.
4. the processing technology of mechanical main shaft according to claim 1, which is characterized in that modifier treatment described in step S2
Concrete technology is：It is heated to 900-930 DEG C of heat preservation 180-240min with 320-350 DEG C/h rates, is filled immediately after heat preservation
High purity inert gas is cooled fast to 40-50 DEG C and comes out of the stove；600-650 DEG C of heat preservation 200- is heated to 350-380 DEG C/h rates again
240min fills high purity inert gas immediately after heat preservation, be cooled fast to 40-50 DEG C and come out of the stove.
5. the processing technology of mechanical main shaft according to claim 1, which is characterized in that half finishing processing described in step S3
Concrete technology be：Size, the vehicle conical surface, taper hole, bores each hole of big end surface at holes drilled through, and outer circle reserves the processing of 3mm-5mm
Surplus, the vehicle conical surface reserve the allowance of 0.6mm-1mm, the allowance of remaining reserved 0.3mm-0.5mm, overall surface is slightly made
Degree is 0.5-0.7mm.
6. the processing technology of mechanical main shaft according to claim 1, which is characterized in that half fine grinding described in step S3
Concrete technology be：Half fine cylindrical, taper hole, outer circle reserve the allowance of 1mm-2mm, and taper hole reserves 0.4mm-0.6mm's
Allowance.
7. the processing technology of mechanical main shaft according to claim 1, which is characterized in that in step sl, the alloy pig
Component and mass percent be：C：0.2-0.5%, Si：0.1-0.3%, Mn：0.05-0.4%, Al：0.8-2%, Cr：
1.2-2.5%, Ni：0.001-0.008%, Mo：0.15-0.3%, surplus are Fe and inevitable impurity.
8. the processing technology of mechanical main shaft according to claim 7, which is characterized in that the component and quality of the alloy pig
Percentage is：C：0.35-0.45%, Si：0.2-0.3%, Mn：0.3-0.5%, Al：0.8-1.2%, Cr：1.4-2%, Ni：
0.01-0.04%, Mo：0.15-0.25%, surplus are Fe and inevitable impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
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| CN104002111A (en) * | 2014-05-27 | 2014-08-27 | 安徽蓝德集团股份有限公司 | Machining center main shaft taper hole machining technology |
| CN106624671A (en) * | 2016-12-09 | 2017-05-10 | 徐玉明 | Processing technology for shaft parts |
Cited By (1)
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| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
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