CN116043156A - Wind power gear shaft surface strengthening method - Google Patents
Wind power gear shaft surface strengthening method Download PDFInfo
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- CN116043156A CN116043156A CN202310039396.XA CN202310039396A CN116043156A CN 116043156 A CN116043156 A CN 116043156A CN 202310039396 A CN202310039396 A CN 202310039396A CN 116043156 A CN116043156 A CN 116043156A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005728 strengthening Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 230000006698 induction Effects 0.000 claims abstract description 53
- 238000005255 carburizing Methods 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 25
- 238000010791 quenching Methods 0.000 claims abstract description 24
- 230000000171 quenching effect Effects 0.000 claims abstract description 24
- 238000005496 tempering Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 230000008595 infiltration Effects 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000004090 dissolution Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910001339 C alloy Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a wind power gear shaft surface strengthening method, and belongs to the technical field of material surface heat treatment. The method comprises the following specific steps: s1, determining the AC3 temperature and the carburizing temperature T2 of wind power gear steel; s2, determining carburizing time t1 according to the condition of the carburizing furnace; s3, heating the gear shaft to the temperature T1, and preserving heat for T2 time; s4, heating the gear shaft to the temperature of T2, adjusting the carbon potential in the furnace to C1, and carrying out strong infiltration for T3 time under the carbon potential of C1; keeping the temperature T2 unchanged, adjusting the carbon potential to C2, and diffusing for T4 time under the C2 carbon potential; s5, slowly cooling the gear shaft to the temperature of T3, and preserving heat for T5 time; s6, cooling to room temperature, and then carrying out induction heating on the gear shaft to the temperature T4 and quenching; s7, after cleaning, induction heating the gear shaft to the temperature T5, and tempering. The method has the advantages that the metallographic structure state is improved, and the strengthening quality is improved; deformation is reduced, and quenching crack risk is reduced; meanwhile, the carbide grade is reduced, the production time is shortened, and the cost is saved.
Description
Technical Field
The invention relates to a wind power gear shaft surface strengthening method, and belongs to the technical field of material surface heat treatment.
Background
With the demand of the development of the age, clean energy occupies an increasingly important content of energy composition. Wind energy is a clean renewable energy source, and has been developed at a high speed in recent years, and the number of installed machines is also continuously increasing in the future. Wind generating sets need to operate for more than twenty years due to high input cost. The gear transmission part of the wind generating set bears the complex turning heavy load effect no matter the wind generating set is an onshore fan or an offshore fan, so that the surface strengthening treatment is required to be carried out on the gear part so as to improve the surface hardness and the wear resistance, and further enhance the service performance of the gear. The transmission gears in the large wind turbine generator have larger modulus because of the need of bearing large load.
At present, when 42CrMo materials are selected for processing gears of gear rings and other parts of a wind power speed increasing box, more and more induction strengthening modes are adopted for surface treatment. However, for structures such as planet gears and gear shafts in wind turbine generators, low-carbon alloy steel materials are often adopted, and the low-carbon alloy steel is usually subjected to surface strengthening treatment in a carburization and carburization quenching mode. Patent number: CN103624505a provides a method for processing a wind power output gear shaft, CN103726006B provides a method for controlling micro deformation of a wind power equipment gear main shaft in heat treatment, and solves the problems of overlarge carburizing and quenching deformation, inconsistent carburizing depth, large stress gradient and the like in the heat treatment process. However, the carburization process parameters are difficult to control, and when the same large-modulus wind power gear shaft workpiece is processed due to the difference between different carburization furnaces, the carburization process parameters cannot be directly re-engraved or used after simple adjustment, so that the workpiece with the same quality is obtained. The strengthening result is directly affected by each stage of the carburization process of the wind power gear shaft and specific parameters of each stage. At present, the carburization strengthening treatment of the large-modulus wind power gear shaft is easy to cause quality problems of overhigh residual austenite content, worse metallographic structure, larger deformation, overlow core hardness and the like, and the production and the use are influenced. Meanwhile, the wind power gear shaft workpiece is large in size, and the carburization treatment takes relatively long time.
Disclosure of Invention
In order to solve the problems in the prior art, the invention discloses a wind power gear shaft surface strengthening method, which is based on carburizing and quenching, adjusts internal technological process and technological parameters, introduces an induction heating mode twice for treatment, changes and increases a basic action mode so as to improve the state of a metallographic structure and improve strengthening quality; deformation is reduced, and quenching crack risk is reduced; meanwhile, the carbide grade is reduced, the production time is shortened, the cost is saved, and the like.
The technical scheme adopted by the invention is as follows: a wind power gear shaft surface strengthening method comprises the following specific steps:
s1, measuring or calculating the AC3 temperature and the carburization temperature T2 of the wind power gear steel.
S2, determining the actual situation of the carburizing furnace, and determining the carburizing time t1 according to the situation of the carburizing furnace.
S3, heating the gear shaft to the temperature T1, and preserving heat for T2.
S4, continuously heating the gear shaft to the temperature T2, adjusting the carbon potential in the furnace to be C1, and carrying out strong infiltration for T3 time under the carbon potential of C1; keeping the temperature T2 unchanged, adjusting the carbon potential to C2, and diffusing for T4 time under the C2 carbon potential.
S5, slowly cooling the gear shaft to the temperature of T3, and preserving heat for T5.
S6, cooling to room temperature, and then carrying out induction heating on the gear shaft to the temperature T4 and quenching.
S7, after cleaning, induction heating the gear shaft to the temperature T5, and tempering.
The AC3 temperature determination in the S1 can be calculated through an empirical formula or calculated according to components by software or measured by a thermal expansion instrument. The AC3 temperature relates to the determination of the temperature related to the subsequent operation steps, and the carburization temperature needs to be determined according to the material properties.
The actual situation of the carburizing furnace determined in the step S2 mainly refers to the service life of the carburizing furnace or design parameters among the carburizing furnaces of different models. The actual situation difference of different carburizing furnaces will lead to different actual treatment processes, so that corresponding carburizing time needs to be determined for different carburizing equipment furnaces.
The preheating temperature T1 during heat preservation is lower than the carburizing temperature T2 during carburizing, and the temperature difference is reduced during heat preservation, so that the surface of the workpiece is more nearly consistent with the internal condition, the internal tensile stress is avoided being too large, and the cracking risk is reduced. The preheating temperature T1 during heat preservation refers to heating a workpiece from an initial temperature to a T1 temperature, and the workpiece is kept at the T1 temperature for T2 time. The carburizing temperature at which carburizing is performed refers to the temperature T2 at which the workpiece undergoes strong infiltration and diffusion.
And the step S5 is carried out slow cooling and heat preservation after carburization, so that the deformation of the wind power gear shaft can be reduced, and the structure grains are refined.
The induction heating quenching temperature in the step S6 is higher than that in the furnace, so that crystal grains are not easy to grow up, and meanwhile, the high temperature can accelerate the dissolution of carbon, and the carbide grade on the surface of the wind power gear shaft is reduced.
The tempering is performed in the step S7 in an induction mode, and the temperature is higher than that of the tempering by using a heating furnace, so that the residual stress and brittleness can be reduced, and the surface hardness is not reduced.
And the steps S6 and S7 are used for carrying out heating treatment on the wind power large gear workpiece by induction heating, and the carbide grade is improved and the residual austenite content is reduced by utilizing the combined action of the electromagnetic force and the magnetic pulse of the strong alternating magnetic field. The induction heating can improve the production speed and reduce the working time; meanwhile, the induction heating can promote and accelerate the dissolution of carbide, and further reduce the working time.
Further, the carburization time t1 in S2 is equal to the sum of the strong carburization time t3 and the diffusion time t4, and t4= (2.9-3.9) ×t3.
Further, in the step S3, the preheating temperature T1 is smaller than the AC3 temperature, and the heat preservation time is not longer than 60 minutes.
Further, the carburization temperature of the gear shaft in S4 is t2=930±10℃.
Further, the carburization temperature T2 is greater than the AC3 temperature.
Further, in S4, the carbon potential C1 is greater than the carbon potential C2.
Further, the temperature range of the slow cooling stage T3 in the step S5 is T1- (0-10 ℃), and the heat preservation time T5 is 30-60 min.
Further, the temperature range of the induction heating quenching temperature T4 in the step S6 is AC < 3+ > (50-90) > DEG C.
Further, the room temperature value range in the S6 is 20-30 ℃.
Further, the temperature range of the induction heating tempering temperature T5 in the step S7 is 180-230 ℃.
Further, the heating temperature in the induction heating process of the induction tempering in the step S7 is not more than 15 ℃/S.
Further, the induction heating quenching in S6 and the induction heating tempering in S7 are both tooth-by-tooth scanning induction heating of the tooth-shaped structure.
The workpiece is a gear shaft.
The invention discloses a wind power gear shaft surface strengthening method, which has the beneficial effects that:
(1) The treatment mode of combining carburization, induction quenching and induction tempering is used in the heat treatment of the large-modulus wind power gear shaft, so that the tissue state is improved, the surface performance of the gear is improved, and the quality of the wind power gear shaft is enhanced.
(2) According to the actual condition of the carburizing furnace, the required strong infiltration, diffusion and heat preservation time is adjusted and determined, the surface strengthening quality can be obviously improved, and the unnecessary waste of the cost in production trial production is reduced.
(3) Preheating treatment is carried out before carburization, and slow cooling treatment is carried out after carburization, so that the deformation of the wind power gear shaft is effectively reduced, grains are thinned, and the risk of quenching cracks is reduced.
(4) Quenching and tempering are carried out by adopting an induction heating mode, so that the dissolution condition of carbide is effectively improved, and the grade and content of carbide are reduced. The martensite grains are refined by utilizing the characteristic of higher induction heating speed.
(5) After carburizing and quenching the wind power gear shaft, low-temperature tempering is performed through induction heating, so that residual stress and brittleness are reduced, meanwhile, the surface quality of the gear shaft is ensured, the residual austenite content is reduced, and the treatment time is shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For a further understanding of the invention, the invention is described in detail below with reference to the drawings:
as shown in FIG. 1, the wind power gear shaft surface strengthening method comprises the following specific steps:
s1, measuring or calculating the AC3 temperature and the carburization temperature T2 of the wind power gear steel.
S2, determining the actual situation of the carburizing furnace, and determining the carburizing time t1 according to the situation of the carburizing furnace.
S3, heating the gear shaft to the temperature T1, and preserving heat for T2.
S4, continuously heating the gear shaft to the temperature T2, adjusting the carbon potential in the furnace to be C1, and carrying out strong infiltration for T3 time under the carbon potential of C1; keeping the temperature T2 unchanged, adjusting the carbon potential to C2, and diffusing for T4 time under the C2 carbon potential.
S5, slowly cooling the gear shaft to the temperature of T3, and preserving heat for T5.
S6, cooling to room temperature, and then carrying out induction heating on the gear shaft to the temperature T4 and quenching.
S7, after cleaning, induction heating the gear shaft to the temperature T5, and tempering.
The AC3 temperature determination in the S1 can be calculated through an empirical formula or calculated according to components by software or measured by a thermal expansion instrument. The AC3 temperature relates to the determination of the temperature related to the subsequent operation steps, and the carburization temperature needs to be determined according to the material properties.
Further, the carburization time t1 in S2 is equal to the sum of the strong carburization time t3 and the diffusion time t4, and t4= (2.9-3.9) ×t3.
Further, the preheating temperature T1 in the step S3 is smaller than the temperature of the AC3, and the heat preservation time is 0< T2 less than or equal to 60 minutes.
Further, the carburization temperature of the gear shaft in S4 is t2=930±10℃.
Further, the carburization temperature T2 is greater than the AC3 temperature.
Further, in S4, the carbon potential C1 is greater than the carbon potential C2.
Further, the temperature range of the slow cooling stage T3 in the step S5 is (T1-10) DEG C-T1 ℃, and the heat preservation time T5 is 30 min-60 min.
Further, the temperature range of the induction heating quenching temperature T4 in the step S6 is AC < 3+ > (50-90) > DEG C.
Further, the temperature range of the induction heating tempering temperature T5 in the step S7 is 180-230 ℃.
Further, the heating temperature in the induction heating process of the induction tempering in the step S7 is not more than 15 ℃/S.
Further, the induction heating quenching in the step S6 and the induction heating tempering in the step S7 are both tooth-by-tooth scanning induction heating of the tooth-shaped structure, and the inductor used for heating is of a profiling structure.
Example 1:
s1, determining that the AC3 temperature of steel used for the wind power gear shaft is 830 ℃, and determining that the carburizing temperature is T2=920 ℃.
S2, according to the actual condition of the carburizing furnace, determining the carburizing time t1 to be 2380 minutes according to the condition of the carburizing furnace, wherein in the embodiment, a UBE-1000 box furnace is adopted, the using temperature is 800-950 ℃, and the electric heating power is 142kW.
And S3, placing the gear shaft into a carburizing furnace for preheating, heating to the temperature of T1=820 ℃, and preserving heat for t2=60 minutes.
S4, continuously heating the gear shaft to 920 ℃ which is the temperature T2, and adjusting the carbon potential in the furnace to C1=1.1%, and carrying out strong permeation for 580 minutes which is the time T3; then, the temperature T2 in the furnace is kept unchanged, the carbon potential is adjusted to c2=0.75%, and the diffusion is performed for 1800 minutes, namely, T4 time.
S5, slowly cooling the gear shaft to the temperature of T3, and preserving heat for T5, wherein T3 is 810 ℃ and T5 is 30 minutes in the example.
S6, cooling to room temperature of 25 ℃, clamping into an induction heating device, preparing for the next operation, carrying out induction heating on a gear shaft to T4 temperature, then carrying out quenching operation, setting the quenching temperature to be T4=880 ℃, heating in a tooth-like scanning mode, and continuously spraying and cooling by a spray device cleaning machine below an inductor.
And S7, cleaning the workpiece after the induction quenching is finished, and after the workpiece is cleaned, carrying out induction heating on the gear shaft to the temperature of T5 and tempering, wherein in the example, the temperature of T5 = 185 ℃, and the heating speed is adjusted to be 15 ℃/s.
The wind power gear shaft surface strengthening method of the invention is different from the device and the method in the prior art in that: according to the invention, the final deformation of the workpiece and the cracking risk are reduced through preheating and slow cooling operation; by improving the carburization process and process parameters, the structure grains are refined, and the content of blocky carbide is reduced. And meanwhile, the quenching and tempering processes of the workpiece after the carburizing process are finished adopt induction heating to heat, so that the induction speed is increased, the dissolution of carbide is enhanced, the carbide grade is reduced, the austenitic content is participated, and the grains are refined.
It should be noted that the induction heating is to adopt induction heating equipment to scan induction heating to tooth by tooth of tooth form structure, and induction heating equipment mainly includes power, transformer, inductor, and induction heating equipment belongs to common sense, so this application does not carry out the description to induction heating equipment repeatedly.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The wind power gear shaft surface strengthening method is characterized by comprising the following specific steps of:
s1, measuring or calculating the AC3 temperature and the carburizing temperature T2 of wind power gear steel;
s2, determining the actual condition of a carburizing furnace, and determining carburizing time t1 according to the condition of the carburizing furnace;
s3, heating the gear shaft to the temperature T1, and preserving heat for T2 time;
s4, continuously heating the gear shaft to the temperature T2, adjusting the carbon potential in the furnace to be C1, and carrying out strong infiltration for T3 time under the carbon potential of C1; keeping the temperature T2 unchanged, adjusting the carbon potential to C2, and diffusing for T4 time under the C2 carbon potential;
s5, slowly cooling the gear shaft to the temperature of T3, and preserving heat for T5 time;
s6, cooling to room temperature, and then carrying out induction heating on the gear shaft to the temperature T4 and quenching;
s7, after cleaning, induction heating the gear shaft to the temperature T5, and tempering.
2. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein carburization time t1 in S2 is equal to the sum of strong carburization time t3 and diffusion time t4, and t4= (2.9-3.9) ×t3.
3. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein the preheating temperature T1 in the step S3 is less than the temperature of the AC3, and the heat preservation time is not more than 60 minutes.
4. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein the carburization temperature T2 = 930±10 ℃ of the gear shaft in S4.
5. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein the carbon potential C1 in S4 is greater than the carbon potential C2.
6. The method for strengthening the surface of the wind power gear shaft according to claim 1, wherein the temperature of the slow cooling stage T3 in the step S5 is (T1-10) DEG C-T1 ℃, and the heat preservation time T5 is 30 min-60 min.
7. The method for strengthening the surface of the wind power gear shaft according to claim 1, wherein the temperature range of the induction heating quenching temperature T4 in the step S6 is AC < 3+ > (50-90) > DEG C; the value range of the room temperature is 20-30 ℃.
8. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein the induction heating tempering temperature in the step S7 is T5, and the temperature range is 180-230 ℃; the heating temperature in the induction heating process of the induction tempering is not more than 15 ℃/s.
9. The method for strengthening the surface of a wind power gear shaft according to claim 1, wherein the induction heating quenching in the step S6 and the induction heating tempering in the step S7 are both tooth-by-tooth scanning induction heating of a tooth-shaped structure.
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| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
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| CN106756755A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of large excavator gear |
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2023
- 2023-01-12 CN CN202310039396.XA patent/CN116043156A/en active Pending
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|---|---|---|---|---|
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