CN114635104A - Nitriding process for wind power gear ring - Google Patents
Nitriding process for wind power gear ring Download PDFInfo
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- CN114635104A CN114635104A CN202210281665.9A CN202210281665A CN114635104A CN 114635104 A CN114635104 A CN 114635104A CN 202210281665 A CN202210281665 A CN 202210281665A CN 114635104 A CN114635104 A CN 114635104A
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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
- C23C8/24—Nitriding
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Abstract
The application relates to the technical field of wind power gear ring heat treatment, in particular to a wind power gear ring nitriding process, which comprises the following steps: s1: cleaning and drying the wind power gear ring with the detected surface damage-free defects; s2: hoisting the dried wind power gear ring into a nitriding furnace, and sealing the nitriding furnace; s3: heating the nitriding furnace to a specific temperature, and keeping the temperature constant for a period of time; s4: introducing nitrogen into the nitriding furnace; s5: continuously heating the nitriding furnace and raising the temperature in a stepped manner, keeping the temperature constant for a period of time after the temperature is raised to a specific temperature, and introducing ammonia gas into the nitriding furnace in the process; s6: continuing heating the nitriding furnace to raise the temperature until the nitriding furnace reaches the temperature required by nitriding, maintaining the constant temperature and the constant pressure in the nitriding furnace, and continuously injecting ammonia gas into the nitriding furnace; s7: and (4) carrying out positive pressure cooling on the nitriding furnace, and after the temperature is reduced to a specific temperature, hoisting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding. The method and the device have the effect of improving the qualification rate of the wind power gear ring.
Description
Technical Field
The application relates to the technical field of heat treatment of wind power gear rings, in particular to a nitriding process of a wind power gear ring.
Background
Wind power generation is to convert kinetic energy of wind into mechanical energy and then mechanical energy into kinetic energy of electricity, and wind energy is increasingly paid more attention to all countries in the world as a clean renewable energy source. The wind power gear ring is an important ring in wind energy product parts, and in the field of wind power generation, the wind power gear ring is in meshing transmission with other output gears so as to provide power for wind power generation equipment.
The wind power gear ring needs to be subjected to heat treatment after being machined and formed to obtain excellent mechanical, physical and chemical properties and meet the strict use requirements, the heat treatment process generally comprises quenching and tempering, high-temperature stress removal and nitriding treatment, a uniform and fine tempering sorbite structure is obtained at the gear ring core part through the heat treatment, and a high-hardness and high-wear-resistance nitride layer is obtained on the surface, so that the gear ring core part obtains high strength and good plastic toughness, has good comprehensive mechanical properties, and has high hardness and wear resistance on the surface.
In the prior art, the nitriding treatment is generally performed by: the wind power gear ring is placed in a nitriding furnace, flowing ammonia gas is introduced and heated, after the heat preservation is carried out for a long time, the ammonia gas is thermally decomposed to generate active nitrogen atoms, the active nitrogen atoms are continuously adsorbed to the surface of the wind power gear ring and are diffused and permeated into the surface layer of the wind power gear ring, so that the chemical composition and the structure of the surface layer are changed, and the excellent surface hardness performance is obtained.
Aiming at the related technologies, the inventor thinks that the wind power gear ring has a large outer diameter and a relatively thin wall thickness, and the gear ring is fully provided with oil passing holes at certain intervals, so that the traditional nitriding treatment process easily causes the problem that the wind power gear ring has serious deformation of end face parallelism and inner hole roundness, and the qualification rate of the wind power gear ring subjected to nitriding treatment is low.
Disclosure of Invention
In order to effectively control the deformation of the wind power gear ring and improve the qualification rate of the wind power gear ring, the application provides a nitriding process of the wind power gear ring.
The nitriding process for the wind power gear ring provided by the application adopts the following technical scheme:
a nitriding process for a wind power gear ring comprises the following steps: s1: cleaning the wind power gear ring with the detected surface damage-free defects, and drying after cleaning; s2: hoisting the dried wind power gear ring into a nitriding furnace through a lifting appliance, and sealing the nitriding furnace; s3: heating the nitriding furnace to a specific temperature, and keeping the temperature constant for a period of time to preliminarily oxidize the wind power gear ring in the nitriding furnace; s4: after the step S3 is finished, introducing nitrogen into the nitriding furnace, and discharging air in the nitriding furnace in a nitrogen purging mode; s5: continuously heating the nitriding furnace and carrying out step temperature rise, keeping the nitriding furnace at a constant temperature for a period of time after the nitriding furnace is subjected to step temperature rise to a specific temperature, and introducing ammonia gas into the nitriding furnace in the process to discharge nitrogen in the nitriding furnace; s6: after the step S5 is finished, heating the nitriding furnace continuously until the nitriding furnace reaches the temperature required by nitriding, maintaining the constant temperature and the constant pressure in the nitriding furnace, and continuously injecting ammonia gas into the nitriding furnace to deeply nitrify the wind power gear ring in the nitriding furnace; s7: and after the step S6 is finished, carrying out positive pressure cooling on the nitriding furnace, and after the temperature is reduced to a specific temperature, hoisting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding.
By adopting the technical scheme, when the wind power gear ring is subjected to nitriding treatment, firstly, the wind power gear ring with damage defects is cleaned and dried, then the wind power gear ring is hoisted into a nitriding furnace, the nitriding furnace is sealed, then the nitriding furnace is heated and heated up to a specific temperature, the constant temperature is kept for a period of time to ensure that the wind power gear ring is preliminarily oxidized in the nitriding furnace, then nitrogen is introduced into the nitriding furnace, air in the nitriding furnace is exhausted in a nitrogen purging mode, then the nitriding furnace is continuously heated and heated in a stepped manner, the constant temperature is kept for a period of time after the temperature of the nitriding furnace is raised to the specific temperature, ammonia is introduced into the nitriding furnace in the process to exhaust the nitrogen in the nitriding furnace, then the nitriding furnace is continuously heated and heated until the nitriding furnace reaches the temperature required by nitriding, the constant temperature and the constant pressure in the nitriding furnace are maintained, and the ammonia is continuously injected into the nitriding furnace, deeply nitriding the wind power gear ring in a nitriding furnace, finally carrying out positive pressure cooling on the nitriding furnace, and hoisting the wind power gear ring out of the nitriding furnace through a lifting appliance after the temperature is reduced to a specific temperature so as to finish nitriding; through the nitriding process, the size precision and the roundness of the wind power gear ring can be effectively guaranteed, the deformation of the wind power gear ring can be effectively controlled, and the qualification rate of the wind power gear ring is improved.
Optionally, the step S3 specifically includes the following steps, S31: and heating the nitriding furnace to raise the temperature in the nitriding furnace to 250 ℃, and keeping the constant temperature for 3 hours to preliminarily oxidize the wind power gear ring in the nitriding furnace.
By adopting the technical scheme, before nitriding treatment of the wind power gear ring, the oxidation degree of the wind power gear ring is controlled through a pre-oxidation process, and the oxygen content of the surface of the wind power gear ring is increased in advance.
Optionally, the step S4 specifically includes the following steps, S41: after the step S3 is finished, introducing nitrogen into the nitriding furnace, continuing heating the nitriding furnace, and keeping the temperature constant for 3 hours when the temperature in the nitriding furnace is raised to 350 ℃; s42: and step S41, synchronously opening a pressure release valve in the process that the temperature in the nitriding furnace rises to 350 ℃, and discharging the air in the nitriding furnace in a nitrogen purging mode.
By adopting the technical scheme, when the temperature in the nitriding furnace rises to 350 ℃, the constant temperature is kept for 3 hours, the wind power gear ring is in high-temperature oxidation at the moment, then the pressure release valve is opened, oxygen in the nitriding furnace is exhausted in a nitrogen purging mode, the oxygen content in the nitriding furnace is reduced, and therefore the possibility of over-oxidation of the wind power gear ring in the subsequent temperature rising process is reduced.
Optionally, the step S5 specifically includes the following steps, S51: continuing to heat and raise the temperature of the nitriding furnace, and keeping the constant temperature for 4 hours when the temperature in the nitriding furnace is raised to 400 ℃; s52: and step S51, continuing heating and heating the nitriding furnace, stopping introducing nitrogen into the nitriding furnace, starting introducing ammonia gas into the nitriding furnace, and keeping the constant temperature for 4 hours when the temperature in the nitriding furnace rises to 450 ℃.
By adopting the technical scheme, after the ammonia gas is introduced, the ammonia gas is heated to generate active nitrogen atoms, the oxygen content of the surface of the wind power gear ring is increased due to the pre-oxidation of the wind power gear ring, and the active nitrogen atoms are easier to permeate into parts under the action of the active nitrogen atoms and the oxygen atoms, so that the nitriding quality of the wind power gear ring in the nitriding furnace is improved.
Optionally, the step S6 specifically includes the following steps, S61: and continuously heating the nitriding furnace and raising the temperature in a stepped manner, continuously introducing ammonia gas into the nitriding furnace, keeping the constant temperature for 100 hours when the temperature in the nitriding furnace is raised to 510 ℃, and deeply nitriding the wind power gear ring in the nitriding furnace.
By adopting the technical scheme, when the temperature in the nitriding furnace rises to 510 ℃, the constant temperature is kept for 100 hours, and at the moment, the wind power gear ring is subjected to deep nitriding in the nitriding furnace.
Optionally, the step S7 specifically includes the following steps, S71: carrying out positive pressure stepped cooling on the nitriding furnace, and keeping the temperature constant for 10 hours when the temperature in the nitriding furnace is reduced to 400 ℃; s72: after the step S71, continuously carrying out positive pressure stepped cooling on the nitriding furnace, and keeping the temperature constant for 5 hours when the temperature in the nitriding furnace is reduced to 350 ℃; s73: and S72, continuously carrying out positive pressure stepped cooling on the nitriding furnace, carrying out air cooling quick cooling when the temperature in the nitriding furnace is reduced to be below 350 ℃, unsealing the nitriding furnace when the temperature in the nitriding furnace is reduced to be below 100 ℃, and lifting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding.
Through adopting above-mentioned technical scheme, after the degree of depth nitriding, carry out malleation ladder cooling to the nitriding furnace, when the temperature drops to below 100 ℃ in the nitriding furnace, relieve the nitriding furnace and seal, hang out the nitriding furnace with wind-powered electricity generation ring gear through the hoist, accomplish the nitriding, at this moment, the nitriding layer surface hardness of wind-powered electricity generation ring gear is higher, and the nitriding deformation is little moreover, the nitriding layer is also thinner, effectively eliminated the fragility on nitriding layer, make the wind-powered electricity generation ring gear have fine comprehensive mechanical properties, the surface has high hardness and wearability.
Optionally, in step S3, step S4, step S5 and step S6, the temperature rise rate of the nitriding furnace is controlled to be within 50 ℃ per hour.
By adopting the technical scheme, the temperature rise rate of the nitriding furnace is controlled within 50 ℃ per hour, so that the possibility that the internal stress of the wind power gear ring is too large and the deformation of the wind power gear ring is increased due to the fact that the temperature rise rate is too large can be reduced.
Optionally, in step S7, the temperature reduction rate of the nitriding furnace is controlled within 50 ℃ per hour.
By adopting the technical scheme, the cooling rate of the nitriding furnace is controlled within 50 ℃ per hour, and the possibility that the internal stress of the wind power gear ring is too large and the deformation of the wind power gear ring is increased due to the fact that the cooling rate is too large can be reduced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by adopting the nitriding process, the size precision and the roundness of the wind power gear ring can be effectively ensured, the wind power gear ring has good comprehensive mechanical properties, the surface has high hardness and wear resistance, the deformation of the wind power gear ring is effectively controlled, and the qualification rate of the wind power gear ring is improved.
Detailed Description
The embodiment of the application discloses a nitriding process for a wind power gear ring, which comprises the following steps:
s1: cleaning the wind power gear ring with the detected surface damage-free defects, and drying after cleaning;
s2: hoisting the dried wind power gear ring into a nitriding furnace through a lifting appliance, and sealing the nitriding furnace;
s3: heating the nitriding furnace to a specific temperature, and keeping the temperature constant for a period of time to preliminarily oxidize the wind power gear ring in the nitriding furnace;
s4: after the step S3 is finished, introducing nitrogen into the nitriding furnace, and discharging air in the nitriding furnace in a nitrogen purging mode;
s5: continuously heating the nitriding furnace and carrying out step temperature rise, keeping the constant temperature for a period of time after the step temperature rise of the nitriding furnace to a specific temperature, and introducing ammonia gas into the nitriding furnace in the process to discharge nitrogen gas in the nitriding furnace;
s6: after the step S5 is finished, the nitriding furnace is continuously heated and heated until the nitriding furnace reaches the temperature required by nitriding, the constant temperature and the constant pressure in the nitriding furnace are maintained, ammonia gas is continuously injected into the nitriding furnace, and the wind power gear ring is subjected to deep nitriding in the nitriding furnace;
s7: and after the step S6 is finished, carrying out positive pressure cooling on the nitriding furnace, and after the temperature is reduced to a specific temperature, hoisting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding.
In the embodiment, the wind power gear ring is made of 42CrMo steel, has the characteristics of high strength, high hardness and good hardenability, and the chemical components of 42CrMo specified in GB/T3077-2015 alloy structural steel are as follows: w (c) =0.38% -0.45%; w (si) =0.17% -0.37%; w (mn) =0.50% -0.80%; w (cr) =0.90% -1.20%; w (mo) =0.15% -0.25%.
The individual steps are explained in detail below.
In step S1, the inspection of the wind power ring gear mainly involves inspecting whether there are cracks, damages, and other defects on the surface of the wind power ring gear; the cleaning of the wind power gear ring mainly relates to the removal of impurities, oil stains and the like on the surface of the wind power gear ring by using an organic solvent; the drying time can be controlled within 20-25 min.
In step S2, the nitriding furnace may be a well type gas nitriding furnace or a hood type gas nitriding furnace, which is not described herein since the well type gas nitriding furnace or the hood type gas nitriding furnace is known in the art.
Step S3 specifically includes the following steps: s31: heating the nitriding furnace to raise the temperature to 250 ℃, and keeping the temperature constant for 3 hours to preliminarily oxidize the wind power gear ring in the nitriding furnace; the purpose of the preliminary oxidation is to control the oxidation degree of the wind power gear ring, and to improve the oxygen content on the surface of the wind power gear ring in advance, it should be further explained that the temperature rise rate is controlled within 50 ℃ per hour, so as to reduce the possibility that the internal stress of the wind power gear ring is too large and the deformation of the wind power gear ring is increased due to too large temperature rise rate.
Step S4 specifically includes the following steps: s41: introducing nitrogen into the nitriding furnace, continuously heating the nitriding furnace to raise the temperature, controlling the rate of temperature rise within 50 ℃ per hour, and keeping the temperature constant for 3 hours when the temperature in the nitriding furnace is raised to 350 ℃; s42: in the step S41, in the process that the temperature in the nitriding furnace rises to 350 ℃, a pressure release valve is synchronously opened, and air in the nitriding furnace is discharged in a nitrogen purging mode; when the temperature in the nitriding furnace rises to 350 ℃, the constant temperature is kept for 3 hours, the wind power gear ring is in high-temperature oxidation, then the pressure release valve is opened, oxygen in the nitriding furnace is exhausted in a nitrogen purging mode, the oxygen content in the nitriding furnace is reduced, and therefore the possibility of over-oxidation of the wind power gear ring in the subsequent temperature rising process is reduced.
Step S5 specifically includes the following steps: s51: continuously heating the nitriding furnace and raising the temperature, wherein the rate of temperature rise is controlled within 50 ℃ per hour, and when the temperature in the nitriding furnace is raised to 400 ℃, the temperature is kept constant for 4 hours; s52: after the step S51, continuously heating and raising the temperature of the nitriding furnace, controlling the rate of temperature rise within 50 ℃ per hour, simultaneously stopping introducing nitrogen into the nitriding furnace, starting introducing ammonia into the nitriding furnace, and keeping the constant temperature for 4 hours when the temperature in the nitriding furnace is raised to 450 ℃; after the ammonia gas is introduced, the ammonia gas is heated to generate active nitrogen atoms, the oxygen content of the surface of the wind power gear ring is increased due to the preoxidation of the wind power gear ring, and the active nitrogen atoms are easy to permeate into parts under the action of the active nitrogen atoms and the oxygen atoms, so that the nitriding quality of the wind power gear ring in the nitriding furnace is improved.
Step S6 specifically includes the following steps: s61: and continuously heating the nitriding furnace and carrying out stepped temperature rise, controlling the temperature rise rate within 50 ℃ per hour, continuously introducing ammonia gas into the nitriding furnace, keeping the constant temperature for 100 hours when the temperature in the nitriding furnace rises to 510 ℃, and deeply nitriding the wind power gear ring in the nitriding furnace.
The step S7 specifically includes the following steps, S71: carrying out positive pressure stepped cooling on the nitriding furnace, controlling the cooling rate within 50 ℃ per hour, and keeping the temperature constant for 10 hours when the temperature in the nitriding furnace is reduced to 400 ℃; s72: after the step S71, continuously carrying out positive pressure stepped cooling on the nitriding furnace, controlling the cooling rate within 50 ℃ per hour, and keeping the temperature constant for 5 hours when the temperature in the nitriding furnace is reduced to 350 ℃; s73: and S72, continuously carrying out positive pressure stepped cooling on the nitriding furnace, carrying out air cooling quick cooling when the temperature in the nitriding furnace is reduced to be below 350 ℃, unsealing the nitriding furnace when the temperature in the nitriding furnace is reduced to be below 100 ℃, and lifting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding. After the deep nitriding, carry out malleation ladder cooling to the nitriding furnace, when the temperature drops to below 100 ℃ in the nitriding furnace, remove the nitriding furnace and seal, hang out the wind-powered electricity generation ring gear out of the nitriding furnace through the hoist, accomplish the nitriding, at this moment, the nitriding layer surface hardness of wind-powered electricity generation ring gear is higher, and the nitriding deformation is little moreover, and the nitriding layer is also thinner, has effectively eliminated the fragility of nitriding layer, makes the wind-powered electricity generation ring gear have fine comprehensive mechanical properties, and the surface has high hardness and wearability.
In conclusion, by adopting the nitriding process, the size precision and the roundness of the wind power gear ring can be effectively ensured, the wind power gear ring has good comprehensive mechanical properties, the surface has high hardness and wear resistance, the deformation of the wind power gear ring is effectively controlled, and the qualification rate of the wind power gear ring is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A nitriding process for a wind power gear ring is characterized by comprising the following steps:
s1: cleaning the wind power gear ring with the detected surface damage-free defects, and drying after cleaning;
s2: hoisting the dried wind power gear ring into a nitriding furnace through a lifting appliance, and sealing the nitriding furnace;
s3: heating the nitriding furnace to a specific temperature, and keeping the constant temperature for a period of time to preliminarily oxidize the wind power gear ring in the nitriding furnace;
s4: after the step S3 is finished, introducing nitrogen into the nitriding furnace, and discharging air in the nitriding furnace in a nitrogen purging mode;
s5: continuously heating the nitriding furnace and carrying out step temperature rise, keeping the constant temperature for a period of time after the step temperature rise of the nitriding furnace to a specific temperature, and introducing ammonia gas into the nitriding furnace in the process to discharge nitrogen gas in the nitriding furnace;
s6: after the step S5 is finished, the nitriding furnace is continuously heated and heated until the nitriding furnace reaches the temperature required by nitriding, the constant temperature and the constant pressure in the nitriding furnace are maintained, ammonia gas is continuously injected into the nitriding furnace, and the wind power gear ring is subjected to deep nitriding in the nitriding furnace;
s7: and after the step S6 is finished, carrying out positive pressure cooling on the nitriding furnace, and after the temperature is reduced to a specific temperature, hoisting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding.
2. The nitriding process for the wind power gear ring according to claim 1, characterized in that: the step S3 specifically includes the following steps, S31: and heating the nitriding furnace to raise the temperature in the nitriding furnace to 250 ℃, and keeping the constant temperature for 3 hours to preliminarily oxidize the wind power gear ring in the nitriding furnace.
3. The nitriding process for the wind power gear ring according to claim 2, characterized in that: the step S4 specifically includes the following steps, S41: after the step S3 is finished, introducing nitrogen into the nitriding furnace, continuing heating the nitriding furnace, and keeping the temperature constant for 3 hours when the temperature in the nitriding furnace is raised to 350 ℃; s42: and step S41, synchronously opening a pressure release valve in the process that the temperature in the nitriding furnace rises to 350 ℃, and discharging the air in the nitriding furnace in a nitrogen purging mode.
4. The nitriding process for the wind power gear ring according to claim 3, characterized in that: the step S5 specifically includes the following steps, S51: continuing to heat and raise the temperature of the nitriding furnace, and keeping the constant temperature for 4 hours when the temperature in the nitriding furnace is raised to 400 ℃; s52: and step S51, continuing heating and heating the nitriding furnace, stopping introducing nitrogen into the nitriding furnace, starting introducing ammonia gas into the nitriding furnace, and keeping the constant temperature for 4 hours when the temperature in the nitriding furnace rises to 450 ℃.
5. The nitriding process for the wind power gear ring according to claim 4, characterized in that: the step S6 specifically includes the following steps, S61: and (3) continuously heating the nitriding furnace and raising the temperature in a stepped manner, continuously introducing ammonia gas into the nitriding furnace, and keeping the constant temperature for 100 hours when the temperature in the nitriding furnace is raised to 510 ℃, wherein at the moment, the wind power gear ring is subjected to deep nitriding in the nitriding furnace.
6. The nitriding process for the wind power gear ring according to claim 5, characterized in that: the step S7 specifically includes the following steps, S71: carrying out positive pressure stepped cooling on the nitriding furnace, and keeping the temperature constant for 10 hours when the temperature in the nitriding furnace is reduced to 400 ℃; s72: after the step S71, continuously carrying out positive pressure stepped cooling on the nitriding furnace, and keeping the temperature constant for 5 hours when the temperature in the nitriding furnace is reduced to 350 ℃; s73: and S72, continuously carrying out positive pressure stepped cooling on the nitriding furnace, carrying out air cooling quick cooling when the temperature in the nitriding furnace is reduced to be below 350 ℃, unsealing the nitriding furnace when the temperature in the nitriding furnace is reduced to be below 100 ℃, and lifting the wind power gear ring out of the nitriding furnace through a lifting appliance to finish nitriding.
7. The nitriding process for the wind power gear ring according to claim 6, characterized in that: in step S3, step S4, step S5 and step S6, the temperature increase rate of the nitriding furnace is controlled to be within 50 ℃ per hour.
8. The nitriding process for the wind power gear ring according to claim 6, characterized in that: in step S7, the temperature reduction rate of the nitriding furnace is controlled within 50 ℃ per hour.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116640912A (en) * | 2023-05-11 | 2023-08-25 | 浙江大学 | Heat treatment surface strengthening method for inner curve hydraulic motor stator guide rail |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04202754A (en) * | 1990-11-30 | 1992-07-23 | Nippon Piston Ring Co Ltd | Production of dry type cylinder liner |
| CN102864408A (en) * | 2011-07-05 | 2013-01-09 | 上海龙钱热处理有限公司 | Deep plasma nitriding process of wind gear ring |
| WO2018107316A1 (en) * | 2016-12-12 | 2018-06-21 | 马飞 | Heat treatment method for ultra-high-carbon bearing steel |
| CN112981307A (en) * | 2021-02-07 | 2021-06-18 | 南京宇能机械有限公司 | 42CrMoA wind power gear ring nitriding process and equipment |
-
2022
- 2022-03-22 CN CN202210281665.9A patent/CN114635104A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04202754A (en) * | 1990-11-30 | 1992-07-23 | Nippon Piston Ring Co Ltd | Production of dry type cylinder liner |
| CN102864408A (en) * | 2011-07-05 | 2013-01-09 | 上海龙钱热处理有限公司 | Deep plasma nitriding process of wind gear ring |
| WO2018107316A1 (en) * | 2016-12-12 | 2018-06-21 | 马飞 | Heat treatment method for ultra-high-carbon bearing steel |
| CN112981307A (en) * | 2021-02-07 | 2021-06-18 | 南京宇能机械有限公司 | 42CrMoA wind power gear ring nitriding process and equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116640912A (en) * | 2023-05-11 | 2023-08-25 | 浙江大学 | Heat treatment surface strengthening method for inner curve hydraulic motor stator guide rail |
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