CN101984139B - Carburizing method for wind power gear used for wind power generation - Google Patents
Carburizing method for wind power gear used for wind power generation Download PDFInfo
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Abstract
The invention provides a carburizing method for a wind power gear used for wind power generation, which comprises the following steps: carrying out first carburizing treatment on the wind power gear to be treated under the atmosphere with carbon potential of 0.8%-1.1%, then carrying out first quenching treatment, further rising the temperature to 600 DEG C-660 DEG C, and carrying out first tempering treatment; then carrying out second carburizing treatment under the atmosphere with the carbon potential of 0.8%-1.0%, and carrying out second quenching treatment after the second carburizing treatment; and further carrying out second tempering treatment on the wind power gear at 150 DEG C-200 DEG C after the second quenching treatment. Compared with the prior art, the carburizing method is characterized by firstly carburizing the wind power gear for 30-40h under the atmosphere with the carbon potential of 0.8%-1.1%, and then uniformly dissolving and dispersing over-saturated carbon in martensite after the first high-temperature tempering so as to be conductive to the next step of the treatment; and further carburizing the wind power gear for 1-4h under the atmosphere with the carbon potential of 0.8%-1.0% after the first high-temperature tempering treatment, thereby further increasing the carbon concentration on the surface of the wind power gear and improving the surface strength during the second carburizing treatment.
Description
Technical field
The present invention relates to the metal heat treatmet field, be specifically related to a kind of method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation.
Background technology
Under the exhausted day by day situation of traditional energy, wind energy more and more receives the attention of countries in the world as a kind of clean energy renewable, pollution-free, that energy is big, prospect is wide, is a kind of important channel of Wind Power Utilization and utilize wind energy to generate electricity.At present, greatly develop the strategic choice that wind generating technology has become countries in the world.
The ultimate principle of wind-power electricity generation is that the kinetic energy with wind changes mechanical energy into, is converted into electric energy to mechanical energy again.The employed device of wind-power electricity generation is called wind power generating set.Usually, wind power generating set is installed in places, air port such as high mountain, wilderness, seabeach, island, stands the impact of the wind effect and the strong gusts of wind of irregular break-in varying load for a long time, but also need stand the influence of the scorching summer and freezing winter and the extreme temperature difference.In addition, because the residing physical environment of wind power generating set has inconvenient traffic, so maintenance difficult is to the safety of the component of wind power generating set with all proposed the requirement of muching higher than the common mechanical part work-ing life.In wind power generating set, the wind-powered electricity generation gear is important core component, is directly determining the life-span of whole wind power generating set its work-ing life.In the process of preparation wind-powered electricity generation gear, need heat-treat to improve its mechanical property it.
At present; The material that typically is used to prepare the wind-powered electricity generation gear is that U.S.'s trade mark is the 4320H steel; Be equivalent to domestic G20CrNi2Mo; Its staple comprises in weight percent: 0.17%～0.23% C, 0.15%～0.35% Si, 0.40%～0.70% Mn, 0.35%～0.65% Cr, 0.20%～0.30% Mo, 1.55%～2.00% Ni ,≤0.025% P ,≤0.015% S, surplus Fe.This material is through after carburizing treatment, and the surface has very high hardness, wear resistance and contact fatigue strength, and heart portion can also keep good toughness, can bear high impact load.
In the prior art, when the wind-powered electricity generation gear is carried out carburizing treatment, adopt traditional pit furnace Deep Carburization Process method usually, be about to the wind-powered electricity generation gear and bury and be placed in the pit furnace, be heated to carburizing temperature then after, completion carburizing treatment under carbon potential atmosphere.With respect to sealed-box type furnace, adopt the shortcoming of pit furnace carburizing to comprise, less better on the homogeneity of the homogeneity of carburizing atmosphere and temperature field; And this wherein most important shortcoming is, because the heating chamber of pit furnace and oil-quenching tank separate, is not an integral body; Thereby in shifting quenching process, pyritous wind-powered electricity generation gear is exposed in the air; So very easily produce zone of oxidation on the surface of wind-powered electricity generation gear, degree of oxidation is deepened greatly in making, thereby has directly influenced the performance of wind-powered electricity generation gear.
Summary of the invention
The problem that the present invention solves is to provide a kind of method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation, and this method for carburizing can effectively be controlled the tiny crack of wind-powered electricity generation gear surface, interior oxidation.
In order to solve the problems of the technologies described above, the present invention provides a kind of method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation, comprising:
Be to carry out the carburizing treatment first time under 0.8%～1.1% the atmosphere at carbon potential with pending wind-powered electricity generation gear, carburization processing time is 30 hours～40 hours for the first time;
Wind-powered electricity generation gear after the said first time carburizing treatment is carried out the quench treatment first time;
Wind-powered electricity generation gear after the said first time quench treatment is warming up to 600 ℃～660 ℃ carries out the temper first time;
Wind-powered electricity generation gear after the said first time temper heated up under carbon potential is 0.8%～1.0% atmosphere, carry out carburizing treatment second time, the second time, carburization processing time was 1 hour～4 hours;
Wind-powered electricity generation gear after the said second time carburizing treatment is carried out the quench treatment second time;
Wind-powered electricity generation gear after the said second time quench treatment is carried out the temper second time at 150 ℃～200 ℃.
Preferably, said wind-powered electricity generation gear is being carried out also comprise step the first time before the carburizing treatment:
Said pending wind-powered electricity generation gear is warming up to 420 ℃～470 ℃ carries out pre-oxidation treatment under oxygen-containing atmosphere.
Preferably, the soaking time during said pre-oxidation treatment is 2～3 hours.
Preferably, said first time, quench treatment was specially:
Wind-powered electricity generation gear after the said first time carburizing treatment is cooled to 800 ℃～900 ℃ carries out the quench treatment first time.
Preferably, be to be cooled to 800 ℃～900 ℃ under 0.75%～0.9% the atmosphere to carry out the quench treatment first time at carbon potential with the wind-powered electricity generation gear after the said first time carburizing treatment.
Preferably, said first time, the soaking time during temper was 4～6 hours.
Preferably, said second time, quench treatment was specially:
Be to be cooled to 800 ℃～900 ℃ under 0.85%～0.95% the atmosphere to carry out the quench treatment second time with the wind-powered electricity generation gear after the said second time carburizing treatment at carbon potential.
Preferably, said second time, the soaking time during temper was 3～4 hours.
Preferably, said first time, carburizing treatment comprised:
A) with the wind-powered electricity generation gear at carbon potential be under 1.0%～1.2% the atmosphere, temperature is carburizing 20 hours～24 hours under 900 ℃～970 ℃ the condition;
B) the wind-powered electricity generation gear after step a) is handled at carbon potential is under 0.9%～1.1% the atmosphere, temperature is carburizing 5 hours～6 hours under 900 ℃～970 ℃ the condition;
C) the wind-powered electricity generation gear after step c) is handled at carbon potential is under 0.7%～0.9% the atmosphere, temperature is carburizing 7 hours～9 hours under 900 ℃～970 ℃ the condition.
Preferably, the cementation process in the said method for carburizing is carried out in the controlled atmosphere case-hardening furnace.
The invention provides a kind of method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation.Compared with prior art, the present invention is earlier to the carburizing 30～40 hours under 0.8%～1.1% atmosphere of wind-powered electricity generation gear, and then behind high tempering for the first time, oversaturated carbon can uniform dissolution and spread in the martensite, helps next step processing; After for the first time high tempering was handled, the present invention was carburizing 1 hour～4 hours under 0.8%～1.0% the atmosphere at carbon potential to the wind-powered electricity generation gear again, during carburizing treatment, can further increase the carbon concentration of wind-powered electricity generation gear surface, thereby improve its surface strength for the second time
A kind of preferred embodiment in; The present invention carries out before the carburizing it being carried out pre-oxidation treatment to the wind-powered electricity generation gear, after the pre-oxidation treatment, not only can remove the greasy dirt that stays in the material surface machining process; Material surface is cleaned more, thereby help the carrying out of carburizing; And, through after the pre-oxidation treatment, can form one deck preoxidation film at material surface; Improved the avidity of wind-powered electricity generation gear workpiece surface carbon atom, when carburizing, carbon atom is not easy to gather the formation carbon black like this; Help obtaining uniform cementation zone, and accelerated carburizing speed.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
The embodiment of the method for carburizing of a kind of wind-powered electricity generation gear that is used for wind-power electricity generation provided by the invention comprises:
Be to carry out the carburizing treatment first time under 0.8%～1.1% the atmosphere at carbon potential with pending wind-powered electricity generation gear, carburization processing time is 30 hours～40 hours for the first time;
Wind-powered electricity generation gear after the said first time carburizing treatment is carried out the quench treatment first time;
Wind-powered electricity generation gear after the said first time quench treatment is warming up to 600 ℃～660 ℃ carries out the temper first time;
Wind-powered electricity generation gear after the said first time temper heated up under carbon potential is 0.8%～1.0% atmosphere, carry out carburizing treatment second time, the second time, carburization processing time was 1 hour～4 hours;
Wind-powered electricity generation gear after the said second time carburizing treatment is carried out the quench treatment second time;
Wind-powered electricity generation gear after the said second time quench treatment is carried out the temper second time at 150 ℃～200 ℃.
Wind-powered electricity generation gear of the present invention is meant the wind-powered electricity generation gear that is used for the wind-powered electricity generation wheel casing of wind-power electricity generation well known to those skilled in the art; It is 4320H shaped steel or domestic G20CrNi2Mo that the wind-powered electricity generation gear material is preferably U.S.'s trade mark; Typical composition comprises by weight percentage: 0.17%～0.23% C, 0.15%～0.35% Si, 0.40%～0.70% Mn, 0.35%～0.65% Cr, 0.20%～0.30% Mo, 1.55%～2.00% Ni ,≤0.025% P ,≤0.015% S, surplus Fe.The material of the wind-powered electricity generation gear among the present invention is not limited to this, also can be the wind-powered electricity generation gear of other material.Said pending wind-powered electricity generation gear is the wind-powered electricity generation gear after the conventional thermal treatment of wind-powered electricity generation gear process after the machining; The conventional heat treating method of the wind-powered electricity generation gear after the machining can be inquired about on the different conventional thermal treatment handbook according to material, belongs to those skilled in the art's common practise.
According to the present invention, the wind-powered electricity generation gear carried out carburizing treatment before, preferably it is carried out pre-oxidation treatment, after the pre-oxidation treatment, not only can remove the greasy dirt that stays in the material surface machining process, material surface is cleaned more, thereby helps the carrying out of carburizing; And, through after the pre-oxidation treatment, can form one deck preoxidation film at material surface; Improved the avidity of wind-powered electricity generation gear workpiece surface carbon atom, when carburizing, carbon atom is not easy to gather the formation carbon black like this; Help obtaining uniform cementation zone, and accelerated carburizing speed.
Following technology is preferably adopted in preoxidation; Being about to the wind-powered electricity generation gear is warming up to 420 ℃～470 ℃ and carries out pre-oxidation treatment under oxygen-containing atmosphere; Soaking time during pre-oxidation treatment is preferably 1～3 hour, and more preferably 2～3 hours, said oxygen-containing atmosphere preferably carried out under air atmosphere.Through after the pre-oxidation treatment, improved the bulk temperature of workpiece, so also practiced thrift the follow-up heat-up time in cementing furnace, improved working (machining) efficiency, help energy-conservation production.
Through after the pre-oxidation treatment, be to carry out carburizing treatment first time under 0.8%～1.1% the atmosphere with the wind-powered electricity generation gear at carbon potential, the first time, carburizing treatment preferably adopted following operation:
A) with the wind-powered electricity generation gear at carbon potential be under 1.0%～1.2% the atmosphere, temperature is carburizing 20 hours～24 hours under 900 ℃～970 ℃ the condition;
B) the wind-powered electricity generation gear after step a) is handled at carbon potential is under 0.9%～1.1% the atmosphere, temperature is carburizing 5 hours～6 hours under 900 ℃～970 ℃ the condition;
C) the wind-powered electricity generation gear after step c) is handled under 0.7%～0.9% the atmosphere, temperature is carburizing 7 hours～9 hours under 900 ℃～970 ℃ the condition.
For the first time in the step a) during carburizing treatment, carbon potential most preferably is 1.1%, and the carbon potential in the step b) most preferably is 1%, and the carbon potential in the step c) most preferably is 0.8%.In first time carburizing treatment operation, step a) is for oozing operation by force, and the carbon potential in this step is the highest, and can make carbon atom be diffused into workpiece surface fully this moment, increases case depth; The carbon potential of step b) and step c) reduces gradually, can increase the concentration of the most surperficial carbide like this, thereby improve its surface hardness, improves wear resistance.
According to the present invention; After the carburizing treatment, the wind-powered electricity generation gear is carried out the quench treatment first time for the first time, quenching processing technology is preferably; Wind-powered electricity generation gear after the first time carburizing treatment is cooled to 800 ℃～900 ℃ carries out quench treatment; Preferably, for the first time the temperature of quench treatment is 840 ℃～860 ℃, preferably under carbon potential is 0.75%～0.9% atmosphere, cools off during temperature when being cooled to quench treatment for the first time; More preferably under carbon potential is 0.8% atmosphere, cool off, quenchant is preferably oil quenching.
After the quench treatment, the wind-powered electricity generation gear is cleaned laggard tempering stove preferably 620 ℃～650 ℃ insulations 4～10 hours for the first time, preferably carried out the temper first time in 5 hours～8 hours 630 ℃～645 ℃ insulations.
For the first time after the temper; Be to carry out the carburizing treatment second time under 0.8%～1.0% the atmosphere at carbon potential preferably with the wind-powered electricity generation gear; For the second time the carbon potential carburizing treatment the time most preferably is 0.9%, and the time is preferably 1 hour～and 4 hours, more preferably 2 hours～3 hours.
For the second time after the carburizing treatment, preferably the wind-powered electricity generation gear is carried out quench treatment second time, the second time quenching processing technology can with the first time technology during quench treatment identical.
For the second time after the quench treatment, preferably with the wind-powered electricity generation gear at 150 ℃～200 ℃, be incubated 2 hours～5 hours and carries out the temper second time, the second time, the temperature during temper was preferably 160 ℃～190 ℃, soaking time is preferably 3 hours～4 hours; For the second time the temperature during temper is more preferably 170 ℃～180 ℃.For the second time after the temper, can be according to carrying out temper for the third time with the same condition of the temper second time.
In above-mentioned carburizing treatment technology, said carburizing treatment operation is preferably carried out in the controlled atmosphere case-hardening furnace.For carbon source atmosphere, the present invention does not have special restriction, can use propane well known to those skilled in the art, methyl alcohol or the like, as long as can satisfy the requirement of the carbon potential among the present invention, the use of carbon source atmosphere also belongs to and well known to a person skilled in the art general knowledge.
The invention provides a kind of method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation.Compared with prior art, the present invention is earlier to the carburizing 30～40 hours under 0.8%～1.1% atmosphere of wind-powered electricity generation gear, and behind high tempering for the first time, the oversaturated carbon of infiltration helps uniform dissolution and is diffused in the surface of wind-powered electricity generation gear, the formation carbide then; After for the first time high tempering was handled, the present invention was carburizing 1 hour～4 hours under 0.8%～1.0% the atmosphere at carbon potential to the wind-powered electricity generation gear again, during carburizing treatment, can further increase the carbide concentration of wind-powered electricity generation gear surface, thereby improve its surface strength for the second time.
Below with specific embodiment effect of the present invention is described, but protection scope of the present invention is not limited by the following examples.
Testpieces in following examples and the comparative example and workpiece material are G20CrNi2Mo; Composition comprises in weight percent: 0.18% C, 0.27% Si, 0.48% Mn, 0.52% Cr, 0.26% Mo, 1.68% Ni ,≤0.025% P ,≤0.015% S, surplus Fe.
The used controlled atmosphere case-hardening furnace of following examples and comparative example is the BBH type gas cementation quenching furnance that Jiangsu Feng Dong thermal technology stock company provides; Used pit carburizing furnace is the FPQ pit carburizing furnace that Jiangsu Fengdongre Technology Co., Ltd provides, and used tempering stove is the BTF tempering stove that Jiangsu Feng Dong thermal technology stock company provides.
Embodiment 1
Testpieces is the cylinder of diameter 160mm * length 100mm, after the machining, and conventional thermal treatment: quenched oil cooling 880 ℃ * 2 hours for the first time; For the second time quench 800 ℃, oil cooling; Tempering 180 ℃ * 1 hour, air cooling.
With the testpieces after the conventional thermal treatment in the controlled atmosphere cementing furnace, be warming up under 430 ℃, air atmosphere, insulation carried out pre-oxidation treatment in 2.5 hours;
Testpieces after the pre-oxidation treatment is carried out the carburizing treatment first time, comprising:
A) under carbon potential is 1.1% atmosphere, temperature is 920 ℃ of following carburizings 22 hours;
B) keep temperature-resistant, carbon potential reduces to 1%, carburizing 5 hours;
C) keep temperature-resistant, carbon potential reduces to 0.8%, carburizing 8 hours;
After the carburizing treatment, carbon potential remains 0.8% for the first time, is cooled to 850 ℃ of insulations 2 hours, gets into quenching oil and carries out the quench treatment first time;
After the quench treatment, washing test spare is sent into testpieces then and is warming up to 630 ℃ in the tempering stove for the first time, is incubated temper 5 hours first time, air cooling;
After the temper, testpieces is being placed cementing furnace for the first time, carbon potential is 0.9%, is incubated 2 hours and carries out the carburizing treatment second time;
After the carburizing treatment, carbon potential remains 0.9% for the second time, is cooled to 850 ℃ of insulations 2 hours, gets into quenching oil and carries out the quench treatment second time;
After the quench treatment, washing test spare is sent into testpieces then and is warming up to 150 ℃ in the tempering stove for the second time, is incubated temper 3 hours second time, air cooling;
For the second time after the temper, according to carrying out temper for the third time with the same condition of the temper second time.
Embodiment 2-embodiment 5
Mainly changed preoxidation condition and car-burization condition, other condition is identical with embodiment 1, and carburizing process parameters is as shown in table 1:
Table 1 embodiment 2-embodiment 5 carburizing process parameters
Embodiment 6
In the present embodiment, workpiece is not carried out pre-oxidation treatment, other technology is identical with embodiment 1.
Embodiment 7
In the present embodiment, compare with embodiment 1, changed the parameter of carburizing treatment for the first time, other procedure technology parameter is identical with embodiment 1, wherein the first time during carburizing treatment carbon potential be 1.1%, carburizing temperature is 920 ℃, carburizing time is 33 hours.
Embodiment 8
In the present embodiment, compare with embodiment 1, omitted for the second time carburizing treatment and quenching processing technology for the second time, other processing parameter is identical with embodiment 1, promptly after the temper first time, directly carries out temper and the temper for the third time second time.
Comparative example 1
Testpieces is the cylinder of diameter 160mm * length 100mm, after the machining, and conventional thermal treatment: quenched oil cooling 880 ℃ * 2 hours for the first time; For the second time quench 800 ℃, oil cooling; Tempering 180 ℃ * 1 hour, air cooling.
Testpieces after the conventional thermal treatment is carried out carburizing treatment in pit furnace, carbon potential is 1.1%, and carburizing time is 45 hours, and carburizing temperature is 920 ℃;
After the carburizing, carbon potential remains 0.8%, is cooled to 850 ℃ of insulations 2 hours, gets into quenching oil and carries out the quench treatment first time.
Temper technology is identical with embodiment 1 for the first time.
For the first time after the temper, according to directly carrying out temper and the temper for the third time second time with embodiment 1 identical technology.
Embodiment 1-8 and comparative example 1 sampling are tested, and concrete test result sees also table 2.
Table 2 embodiment of the invention and comparative example testpieces The performance test results
The result of table 2 shows that through after the pre-oxidation treatment, the hardness on the testpieces surface that obtains is higher than the surface hardness without the workpiece of pre-oxidation treatment.In addition, the surface hardness of the workpiece after the employing pit furnace carburizing treatment will be lower than the surface hardness of the workpiece in the controlled atmosphere cementing furnace, and the carbide surface rank is higher, is prone to form tiny crack.(the carbide surface rank need meet the requirement of GB/T 3480-5 " strength of gear teeth and quality of materials " carburized gears highest level ME)
Embodiment 10
After machining obtains the wind-powered electricity generation gear, according to carrying out conventional thermal treatment, pre-oxidation treatment and carburizing treatment with embodiment 1 same technology.
Measuring wind-powered electricity generation gear surface hardness is 62.0HRC, and the nondestructive testing result shows that inner maximum tiny crack length is 0.15 μ m.
Embodiment 11
After machining obtains the wind-powered electricity generation gear, according to carrying out conventional thermal treatment and carburizing treatment with embodiment 6 same technologies.
Measuring wind-powered electricity generation gear surface hardness is 60.5HRC, and the nondestructive testing result shows that inner maximum tiny crack length is 0.24 μ m.
Comparative example 2
After machining obtains the wind-powered electricity generation gear, according to carrying out conventional thermal treatment and carburizing treatment with comparative example 1 same technology.
Measuring wind-powered electricity generation gear surface hardness is 61.0HRC, and the nondestructive testing result shows that inner maximum tiny crack length is 1.2 μ m.
More than the wind-powered electricity generation gear wheel carburization method that is used for wind-powered electricity generation generating provided by the present invention has been carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (9)
1. method for carburizing that is used for the wind-powered electricity generation gear of wind-power electricity generation comprises:
Pending wind-powered electricity generation gear is carried out the carburizing treatment first time, and said first time, carburizing treatment comprised:
A) with the wind-powered electricity generation gear at carbon potential be under 1.0%～1.2% the atmosphere, temperature is carburizing 20 hours～24 hours under 900 ℃～970 ℃ the condition;
B) the wind-powered electricity generation gear after step a) is handled at carbon potential is under 0.9%～1.1% the atmosphere, temperature is carburizing 5 hours～6 hours under 900 ℃～970 ℃ the condition;
C) the wind-powered electricity generation gear after step b) is handled under 0.7%～0.9% the atmosphere, temperature is carburizing 7 hours～9 hours under 900 ℃～970 ℃ conditions;
Wind-powered electricity generation gear after the said first time carburizing treatment is carried out the quench treatment first time;
Wind-powered electricity generation gear after the said first time quench treatment is warming up to 600 ℃～660 ℃ carries out the temper first time;
Wind-powered electricity generation gear after the said first time temper heated up under carbon potential is 0.8%～1.0% atmosphere, carry out carburizing treatment second time, the second time, carburization processing time was 1 hour～4 hours;
Wind-powered electricity generation gear after the said second time carburizing treatment is carried out the quench treatment second time;
Wind-powered electricity generation gear after the said second time quench treatment is carried out the temper second time at 150 ℃～200 ℃.
2. method for carburizing according to claim 1 is characterized in that, said wind-powered electricity generation gear is being carried out also comprise step the first time before the carburizing treatment:
Said pending wind-powered electricity generation gear is warming up to 420 ℃～470 ℃ carries out pre-oxidation treatment under oxygen-containing atmosphere.
3. method for carburizing according to claim 2 is characterized in that, the soaking time during said pre-oxidation treatment is 2～3 hours.
4. method for carburizing according to claim 2 is characterized in that, said first time, quench treatment was specially:
Wind-powered electricity generation gear after the said first time carburizing treatment is cooled to 800 ℃～900 ℃ carries out the quench treatment first time.
5. method for carburizing according to claim 4 is characterized in that, with the wind-powered electricity generation gear after the said first time carburizing treatment at carbon potential is to be cooled to 800 ℃～900 ℃ under 0.75%～0.9% the atmosphere protection to carry out the quench treatment first time.
6. method for carburizing according to claim 5 is characterized in that, said first time, the soaking time during temper was 4～6 hours.
7. method for carburizing according to claim 6 is characterized in that, said second time, quench treatment was specially:
Be to be cooled to 800 ℃～900 ℃ under 0.85%～0.95% the atmosphere protection to carry out the quench treatment second time with the wind-powered electricity generation gear after the said second time carburizing treatment at carbon potential.
8. method for carburizing according to claim 7 is characterized in that, said second time, the soaking time during temper was 3～4 hours.
9. method for carburizing according to claim 1 is characterized in that the cementation process in the said method for carburizing is carried out in the controlled atmosphere case-hardening furnace.
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| CN114000094B (en) * | 2021-11-03 | 2023-05-19 | 徐州徐工传动科技有限公司 | Carburizing and quenching process for thin-wall gear |
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| CN1572896A (en) * | 2003-06-12 | 2005-02-02 | 光洋热系统株式会社 | Gas carburizing method |
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| JPH0432548A (en) * | 1990-05-30 | 1992-02-04 | Daido Steel Co Ltd | Manufacture of power transmission parts |
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