CN113930716A - Ion nitriding method for ultrahigh-strength stainless steel gear - Google Patents
Ion nitriding method for ultrahigh-strength stainless steel gear Download PDFInfo
- Publication number
- CN113930716A CN113930716A CN202111012409.1A CN202111012409A CN113930716A CN 113930716 A CN113930716 A CN 113930716A CN 202111012409 A CN202111012409 A CN 202111012409A CN 113930716 A CN113930716 A CN 113930716A
- Authority
- CN
- China
- Prior art keywords
- nitriding
- tool
- gear
- stainless steel
- strength stainless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C23C8/36—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 using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
-
- 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
- C23C8/04—Treatment of selected surface areas, e.g. using masks
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to an ion nitriding method for an ultrahigh-strength stainless steel gear, which comprises the following steps: s1, designing a nitriding tool and a profiling tool; s2, cleaning the nitriding tool and the profiling tool by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol; s3, carrying out vacuum annealing heat treatment on the cleaned nitriding tool and the cleaned profiling tool; s4, wiping the outer surface of the gear part and the position of the small hole, wiping with absolute ethyl alcohol, and drying with oilless compressed air or nitrogen; s5, forming a test piece and profiling tool assembly; s6, uniformly distributing the combined nitriding tool and gear part, test piece and profiling tool assembly on a cathode disc of the ion nitriding furnace; s7, nitriding the gear parts and the test piece; s8, cooling the nitriding tool, the gear part, the test piece and the profiling tool assembly to below 50 ℃ and discharging. The method can adjust the technological parameters in the nitriding process and can meet the requirement of uniform distribution of the nitriding layer along the tooth profile.
Description
Technical Field
The invention relates to an ion nitriding method for an ultrahigh-strength stainless steel gear, belonging to the technical field of chemical heat treatment.
Background
The ultrahigh-strength stainless steel is a metal structural material with highest tensile strength, best toughness and other comprehensive mechanical properties at present, is widely applied to the fields of aviation, aerospace and other high technologies, and becomes an irreplaceable material for main bearing members such as fighters, missiles, rocket shells, engines, precision mechanical transmission gears and the like. The requirements for ultra-high strength steels in gear applications include primarily ultra-high strength, high toughness, and corrosion resistance, among others, to meet their needs for reduced structural mass, reduced volume, extended life, and reliable service.
The gears can bear loads with different speeds and different sizes in the working process, and the gears can continuously generate mutual abrasion. Once the abrasion is too large, the gear meshing has errors, and the normal operation of a mechanical system is influenced. In order to ensure the normal work of the gear, the gear needs to be subjected to ion nitriding, so that the surface hardness is improved, the requirement on wear resistance is met, and the service life of a gear part is ensured.
The ion nitriding is to utilize the rarefied nitrogen-containing gas to generate glow discharge to bombard and heat the surface of the metal material and form nitride for strengthening. For the ultra-high strength stainless steel gear, the nitriding surface strengthening has obvious difficulty: 1) the content of alloy elements is high, the anti-infiltration effect is obvious, and the thickness of a nitriding layer is difficult to obtain. 2) The nitriding process can generate shielding phenomenon, so that the gear nitriding layer is not uniform. According to the ion glow discharge principle, during ion nitriding, the surface of a cathode workpiece is covered with a glow discharge layer. The modulus of the ultra-high strength stainless steel gear is 1, and the distance between teeth below a reference circle is smaller than the thickness of a cathode pressure drop layer, so that partial shielding phenomenon exists between the teeth below the reference circle, the diffusion of nitrogen atoms is inhibited, and finally the distribution of a gear tooth profile nitriding layer is uneven. 3) The conventional detection sample is generally a real object or a cylindrical test block with the diameter of 20 mm-25 mm and the height of 8 mm-10 mm. For the ultrahigh-strength stainless steel gear, a material object is used as a test piece, so that the cost is high; the test block is adopted as a test sample, and the structure of the test block cannot represent the actual nitriding effect of the tooth part.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the method for ion nitriding the ultrahigh-strength stainless steel gear is provided, wherein a non-nitriding part of a gear part is protected from a nitriding layer through tool design; adjusting nitriding parameters to enable the whole tooth profile to obtain a uniform nitriding layer meeting the technical requirements and performance; manufacturing a gear profiling test piece, and accurately representing a nitriding layer and the performance of a tooth part; the local surface of the gear tooth part is strengthened, so that the wear resistance of the tooth part is greatly improved, and the service life of parts is prolonged.
The technical scheme of the invention is as follows:
s1, designing a nitriding tool and a profiling tool according to the size and shape of the ultrahigh-strength gear part:
the nitriding tool is of an annular structure, a non-nitriding surface of the gear is protected, a gap between the nitriding tool and the gear is not more than 0.5mm, and a non-nitriding surface outer surface is ensured to have no diffusion layer;
the profile modeling tool is consistent with the actual product profile gear in shape, 4-6 complete tooth structures are lacked, the lacked 4-6 complete tooth structures are used as test pieces and are installed on the profile modeling tool, the profile modeling tool is consistent with the profile of the ultrahigh-strength stainless steel gear and is used for simulating nitriding of the ultrahigh-strength stainless steel gear product so as to represent the nitriding layer performance of the tooth part;
s2, cleaning the nitriding tool and the profiling tool in the S1 by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol;
s3, carrying out vacuum annealing heat treatment on the cleaned nitriding tool and the profiling tool in the S2: charging at room temperature, with the heating rate of 8-15 ℃/min and the vacuum annealing temperature of 550-;
s4, wiping the outer surface of the gear part and the positions of the small holes by using a hydrocarbon cleaning agent, wiping by using absolute ethyl alcohol, and drying by using oilless compressed air or nitrogen;
s5, clamping the gear part in the S4 in a nitriding tool, and adjusting the tool to enable the nitriding part of the tooth part not to be shielded; combining a test piece with a profiling tool to form a test piece and profiling tool combination;
s6, uniformly distributing the nitriding tool and gear parts, the test piece and the profiling tool assembly which are combined in the S5 on a cathode disc of the ion nitriding furnace;
s7, nitriding the gear parts and the test pieces in the S6:
putting the gear into a furnace at room temperature, vacuumizing to enable the vacuum degree in the furnace to be better than 5Pa, filling nitrogen hydrogen gas into the furnace, bombarding the surface of the gear by adopting plasma, controlling the voltage between a cathode disc and the furnace wall, adjusting electrical parameters in the nitriding and heating processes, bombarding and heating the tool by utilizing glow, adjusting the glow form of the plasma, enabling the glow to be distributed along the contour of the gear so as to enable a nitriding layer to be uniformly distributed along the contour of the gear, and finally forming a nitriding layer on the surface of the high-strength gear part and the test piece;
and S8, cooling the nitriding tool and the gear part, the test piece and the profiling tool assembly in the S7 to below 50 ℃ and discharging.
Furthermore, in S7, the ratio of the nitrogen-hydrogen gas filled into the furnace is 1.0: 5.0-1.0: 3.0.
Further, in S7, the voltage between the cathode disk and the furnace wall is controlled to be 350-550V, and the current is controlled to be 30-60A.
Further, in S7, the temperature rise rate is 5-10 deg.C/min.
Further, in S7, the nitriding temperature is 490-510 ℃.
Furthermore, in S7, the nitriding heat preservation time is 8-12 h.
Furthermore, in S7, the surface hardness HV of the nitriding part is more than or equal to 698, and the depth D of the penetration layerN≥0.05mm。
Furthermore, the nitriding layer structure is free of defects through 500 times of metallographic observation, and the brittleness of the nitriding layer is grade 1.
Compared with the prior art, the invention has the beneficial effects that:
(1) aiming at the problem of nitriding strengthening of the ultrahigh-strength stainless steel gear, the nitriding tool is adopted, so that a non-nitriding part is free of a nitriding layer, and nitriding strengthening of a tooth part is guaranteed. The profiling tool is used for combining the sample, so that the performance of the nitriding layer of the tooth part can be accurately represented, the tool can be repeatedly used, and the economy and the saving are realized;
(2) the invention adopts a vacuum state cooling process mode, thereby effectively avoiding the problem of hydrogen embrittlement caused by hydrogen absorption of the ultrahigh-strength stainless steel;
(3) the method adopts ion nitriding, adopts a mode of bombarding the surface of the ultra-high strength stainless steel by plasma, can effectively shorten nitriding time, and greatly improves the working efficiency compared with gas nitriding;
(4) the invention can adjust the technological parameters in the nitriding process, and can meet the requirement of uniform distribution of the nitriding layer along the tooth profile;
(5) the method can effectively avoid the white bright layer structure on the surface layer of the nitriding layer, ensure that the nitriding layer meets the requirement of grade 1 brittleness, meet the requirement on hardness and nitriding of the nitriding layer through surface Vickers hardness detection and metallographic and scanning electron microscope observation, and ensure that the nitriding layer is uniform and free of defects.
Drawings
FIG. 1 illustrates an internal gear assembly of the present invention;
FIG. 2 is an external gear tooling of the present invention;
FIG. 3 is a process flow of gear ion nitriding;
FIG. 4 shows the microstructure of the internal tooth portion under an electron microscope with 500 times of metallographic phase and 1000 times of ionic nitriding;
FIG. 5 shows the microstructure of the external tooth portion under an electron microscope with 500 times of metallographic phase and 1000 times of ionic nitriding phase;
FIG. 6 shows the distribution profile of the nitrided layer of the internal gear along the tooth profile;
FIG. 7 shows the distribution profile of the nitrided layer of the external gear along the tooth profile;
FIG. 8 shows a brittle indentation of a nitrided layer of an internal gear;
figure 9 is a brittle indentation of the nitrided layer of the external gear.
Detailed Description
The invention is further illustrated by the following examples.
An ion nitriding method for an ultrahigh-strength stainless steel gear, as shown in figure 3, comprises the following steps:
s1, designing a nitriding tool and a profiling tool according to the size and shape of the ultra-high-strength gear part, as shown in figures 1 and 2:
the nitriding tool is of an annular structure, a non-nitriding surface of the gear is protected, a gap between the nitriding tool and the gear is not more than 0.5mm, and a non-nitriding surface outer surface is ensured to have no diffusion layer;
the profile modeling tool is consistent with the actual product profile gear in shape, 4-6 complete tooth structures are lacked, the lacked 4-6 complete tooth structures are used as test pieces and are installed on the profile modeling tool, the profile modeling tool is consistent with the profile of the ultrahigh-strength stainless steel gear and is used for simulating nitriding of the ultrahigh-strength stainless steel gear product so as to represent the nitriding layer performance of the tooth part;
s2, cleaning the nitriding tool and the profiling tool in the S1 by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol;
s3, carrying out vacuum annealing heat treatment on the cleaned nitriding tool and the profiling tool in the S2: charging at room temperature, with the heating rate of 8-15 ℃/min and the vacuum annealing temperature of 550-;
s4, wiping the outer surface of the gear part and the positions of the small holes by using a hydrocarbon cleaning agent, wiping by using absolute ethyl alcohol, and drying by using oilless compressed air or nitrogen;
s5, clamping the gear part in the S4 in a nitriding tool, and adjusting the tool to enable the nitriding part of the tooth part not to be shielded; combining a test piece with a profiling tool to form a test piece and profiling tool combination;
s6, uniformly distributing the nitriding tool and gear parts, the test piece and the profiling tool assembly which are combined in the S5 on a cathode disc of the ion nitriding furnace;
s7, nitriding the gear parts and the test pieces in the S6:
putting the gear into a furnace at room temperature, vacuumizing to enable the vacuum degree in the furnace to be better than 5Pa, filling nitrogen hydrogen gas into the furnace, bombarding the surface of the gear by adopting plasma, controlling the voltage between a cathode disc and the furnace wall, adjusting electrical parameters in the nitriding and heating processes, bombarding and heating the tool by utilizing glow, adjusting the glow form of the plasma, enabling the glow to be distributed along the contour of the gear so as to enable a nitriding layer to be uniformly distributed along the contour of the gear, and finally forming a nitriding layer on the surface of the high-strength gear part and the test piece;
and S8, cooling the nitriding tool and the gear part, the test piece and the profiling tool assembly in the S7 to below 50 ℃ and discharging.
S7, controlling the ratio of the nitrogen-hydrogen gas filled in the furnace to be 1.0: 5.0-1.0: 3.0, controlling the voltage between the cathode disc and the furnace wall to be 350-550V, the current to be 30-60A, the heating rate to be 5-10 ℃/min, the nitriding temperature to be 490-510 ℃, the nitriding heat preservation time to be 8-12h, the surface hardness HV of the nitriding part to be more than or equal to 698, and the depth D of the nitriding layerNThe thickness is more than or equal to 0.05mm, the structure of the nitriding layer is free from defects by 500 times of metallographic observation, and the brittleness of the nitriding layer is grade 1.
Example 1:
1) designing a nitriding tool according to the size and shape of the internal gear part to protect non-nitriding parts except the tooth part; and manufacturing a profiling tool and a test piece.
2) Cleaning the nitriding tool and the profiling tool in the step 1) by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol.
3) Carrying out vacuum annealing heat treatment on the nitriding tool and the profiling tool in the step 2), wherein the heat treatment parameters are as follows:
a furnace charging mode: charging at room temperature;
the heating rate is as follows: 10 ℃/min;
vacuum annealing temperature: 600 ℃;
and (3) heat preservation: 2 h;
and (3) cooling: discharging from the furnace when the furnace temperature is below 150 ℃.
4) Wiping the outer surface and the tooth part position of the gear part by using a hydrocarbon cleaning agent, then wiping by using absolute ethyl alcohol, and drying by using oilless compressed air or nitrogen and the like;
5) clamping the gear part in the step 4) in a nitriding tool, and combining the profile piece and the test piece;
6) uniformly placing the nitriding tool (provided with the gear parts) in the step 5) on a cathode disc;
7) nitriding the gear part in the step 6), wherein the nitriding treatment parameters are as follows:
a furnace charging mode: charging into a furnace at room temperature; vacuum degree: the vacuum degree before heating is better than 5 Pa; the heating rate is as follows: 5 ℃/min; nitriding temperature: 500 ℃; nitriding heat preservation time: 10 h; the nitrogen-hydrogen ratio: 1.0: 4.0; voltage: 450V; current: 50A.
8) And (3) discharging the nitriding part furnace in the step 7) to below 50 ℃, and keeping the vacuum pump in a working state in the cooling process.
The obtained nitriding layer of the nitriding test piece is detected by a Vickers hardness tester, and the hardness meets the requirement; and the nitriding is uniform and has no defects through metallographic detection, as shown in figure 4. The nitriding layer is uniformly distributed along the tooth profile, the shielding problem is avoided, as shown in figure 6, and the requirement of the depth of the nitriding layer is met. Four sides of the indentation are complete in the surface brittleness test of the nitriding layer, and the surface brittleness test conforms to the brittleness level 1 requirement, as shown in figure 8.
Example 2:
1) designing a nitriding tool according to the size and shape of the external gear part to protect non-nitriding parts except the tooth part; and manufacturing a profiling tool and a test piece.
2) Cleaning the nitriding tool and the profiling tool in the step 1) by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol.
3) Carrying out vacuum annealing heat treatment on the nitriding tool and the profiling tool in the step 2), wherein the heat treatment parameters are as follows:
a furnace charging mode: charging at room temperature; the heating rate is as follows: 10 ℃/min; vacuum annealing temperature: 600 ℃; and (3) heat preservation: 2 h; and (3) cooling: discharging from the furnace when the furnace temperature is below 150 ℃.
4) Wiping the outer surface and the tooth part position of the gear part by using a hydrocarbon cleaning agent, then wiping by using absolute ethyl alcohol, and drying by using oilless compressed air or nitrogen and the like;
5) clamping the gear part in the step 4) in a nitriding tool, and combining the profile piece and the test piece;
6) uniformly placing the nitriding tool (provided with the gear parts) in the step 5) on a cathode disc;
7) nitriding the gear part in the step 6), wherein the nitriding treatment parameters are as follows:
a furnace charging mode: charging into a furnace at room temperature; vacuum degree: the vacuum degree before heating is better than 5 Pa; the heating rate is as follows: 5 ℃/min; nitriding temperature: 500 ℃; nitriding heat preservation time: 10 h; the nitrogen-hydrogen ratio: 1.0: 4.0; voltage: 450V; current: 50A.
8) And (3) discharging the nitriding part furnace in the step 7) to below 50 ℃, and keeping the vacuum pump in a working state in the cooling process.
The obtained nitriding layer of the nitriding test piece is detected by a Vickers hardness tester, and the hardness meets the requirement; and the nitriding is uniform and has no defects through metallographic detection, as shown in figure 5. The nitriding layer is uniformly distributed along the tooth profile, the shielding problem is avoided, as shown in figure 7, and the requirement of the depth of the nitriding layer is met. Four sides of the indentation are complete in the surface brittleness test of the nitriding layer, and the surface brittleness test conforms to the brittleness level 1 requirement, as shown in figure 9.
Aiming at the problem of nitriding strengthening of the ultrahigh-strength stainless steel gear, the nitriding tool is adopted, so that a non-nitriding part is free of a nitriding layer, and nitriding strengthening of a tooth part is guaranteed. The profiling tool is used for combining the sample, so that the performance of the nitriding layer of the tooth part can be accurately represented, the tool can be repeatedly used, and the economy and the saving are realized;
the invention adopts a vacuum state cooling process mode, thereby effectively avoiding the problem of hydrogen embrittlement caused by hydrogen absorption of the ultrahigh-strength stainless steel;
the method adopts ion nitriding, adopts a mode of bombarding the surface of the ultra-high strength stainless steel by plasma, can effectively shorten nitriding time, and greatly improves the working efficiency compared with gas nitriding;
the invention can adjust the technological parameters in the nitriding process, and can meet the requirement of uniform distribution of the nitriding layer along the tooth profile;
the method can effectively avoid the white bright layer structure on the surface layer of the nitriding layer, ensure that the nitriding layer meets the requirement of grade 1 brittleness, meet the requirement on hardness and nitriding of the nitriding layer through surface Vickers hardness detection and metallographic and scanning electron microscope observation, and ensure that the nitriding layer is uniform and free of defects.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. An ion nitriding method for an ultrahigh-strength stainless steel gear is characterized by comprising the following steps:
s1, designing a nitriding tool and a profiling tool according to the size and shape of the ultrahigh-strength gear part:
the nitriding tool is of an annular structure, a non-nitriding surface of the gear is protected, a gap between the nitriding tool and the gear is not more than 0.5mm, and a non-nitriding surface outer surface is ensured to have no diffusion layer;
the profile modeling tool is consistent with the actual product profile gear in shape, 4-6 complete tooth structures are lacked, the lacked 4-6 complete tooth structures are used as test pieces and are installed on the profile modeling tool, the profile modeling tool is consistent with the profile of the ultrahigh-strength stainless steel gear and is used for simulating nitriding of the ultrahigh-strength stainless steel gear product so as to represent the nitriding layer performance of the tooth part;
s2, cleaning the nitriding tool and the profiling tool in the S1 by using a hydrocarbon cleaning agent, and wiping by using absolute ethyl alcohol;
s3, carrying out vacuum annealing heat treatment on the cleaned nitriding tool and the profiling tool in the S2: charging at room temperature, with the heating rate of 8-15 ℃/min and the vacuum annealing temperature of 550-;
s4, wiping the outer surface of the gear part and the positions of the small holes by using a hydrocarbon cleaning agent, wiping by using absolute ethyl alcohol, and drying by using oilless compressed air or nitrogen;
s5, clamping the gear part in the S4 in a nitriding tool, and adjusting the tool to enable the nitriding part of the tooth part not to be shielded; combining a test piece with a profiling tool to form a test piece and profiling tool combination;
s6, uniformly distributing the nitriding tool and gear parts, the test piece and the profiling tool assembly which are combined in the S5 on a cathode disc of the ion nitriding furnace;
s7, nitriding the gear parts and the test pieces in the S6:
putting the gear into a furnace at room temperature, vacuumizing to enable the vacuum degree in the furnace to be better than 5Pa, filling nitrogen hydrogen gas into the furnace, bombarding the surface of the gear by adopting plasma, controlling the voltage between a cathode disc and the furnace wall, adjusting electrical parameters in the nitriding and heating processes, bombarding and heating the tool by utilizing glow, adjusting the glow form of the plasma, enabling the glow to be distributed along the contour of the gear so as to enable a nitriding layer to be uniformly distributed along the contour of the gear, and finally forming a nitriding layer on the surface of the high-strength gear part and the test piece;
and S8, cooling the nitriding tool and the gear part, the test piece and the profiling tool assembly in the S7 to below 50 ℃ and discharging.
2. The ion nitriding method for the ultrahigh-strength stainless steel gear according to claim 1, wherein in S7, the ratio of nitrogen-hydrogen gas filled in the furnace is 1.0: 5.0-1.0: 3.0.
3. The ion nitriding method for ultra-high strength stainless steel gear according to claim 1, wherein in S7, the voltage between the cathode disk and the furnace wall is controlled to 350-550V, and the current is controlled to 30-60A.
4. The ion nitriding method for ultra-high strength stainless steel gears according to claim 1, wherein in S7, the temperature rise rate is 5-10 ℃/min.
5. The method for ion-nitriding of ultra-high strength stainless steel gears according to claim 1, wherein in S7, the nitriding temperature is 490-510 ℃.
6. The ion nitriding method for ultra-high strength stainless steel gears according to claim 1, wherein in S7, the nitriding holding time is 8-12 h.
7. The ion nitriding method for ultrahigh-strength stainless steel gear according to claim 1, wherein in S7, surface hardness HV of nitriding part is not less than 698, and depth D of carburized layerN≥0.05mm。
8. The ion nitriding method for ultra-high strength stainless steel gears according to claim 7, wherein the nitriding layer is free of defects in structure and grade 1 in 500-fold metallographic observation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111012409.1A CN113930716A (en) | 2021-08-31 | 2021-08-31 | Ion nitriding method for ultrahigh-strength stainless steel gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111012409.1A CN113930716A (en) | 2021-08-31 | 2021-08-31 | Ion nitriding method for ultrahigh-strength stainless steel gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113930716A true CN113930716A (en) | 2022-01-14 |
Family
ID=79274680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111012409.1A Pending CN113930716A (en) | 2021-08-31 | 2021-08-31 | Ion nitriding method for ultrahigh-strength stainless steel gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113930716A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011779A (en) * | 2022-06-23 | 2022-09-06 | 东风商用车有限公司 | High-speed heavy-load automobile nitrided inner gear ring and production process thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102217A (en) * | 1986-04-08 | 1987-10-21 | 大连海运学院 | Vacuum ionic carburization without external heat source |
| DE19526387A1 (en) * | 1994-07-19 | 1996-02-29 | Sumitomo Metal Mining Co | Steel components with wear and oxidation resistant double coating |
| US20150027591A1 (en) * | 2012-03-22 | 2015-01-29 | Nippon Steel & Sumitomo Metal Corporation | Steel material for nitriding and nitrided component |
| CN105171364A (en) * | 2015-09-16 | 2015-12-23 | 贵州群建精密机械有限公司 | Machining method of timing gear of heavy truck automobile engine |
| CN106191759A (en) * | 2016-08-23 | 2016-12-07 | 常州新区河海热处理工程有限公司 | Reduce the vacuum glow glow discharge nitriding technique of industrial robot precision gear deformation |
| CN108588634A (en) * | 2018-06-12 | 2018-09-28 | 昆山易博群拓新材料科技有限公司 | A kind of stainless steel anode leafing component nitridation device and nitriding method |
| RU2711064C1 (en) * | 2019-02-05 | 2020-01-15 | федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный авиационный технический университет" | Method of increasing wear resistance of a gear-type part |
| CN111118373A (en) * | 2018-10-30 | 2020-05-08 | 湖北威能达传动有限责任公司 | High-torque precision gear and preparation method thereof |
| CN111636046A (en) * | 2020-05-09 | 2020-09-08 | 北京卫星制造厂有限公司 | Local ion nitriding method for deep cavity threads of titanium alloy part |
| JP2021025063A (en) * | 2019-07-31 | 2021-02-22 | Ｄｏｗａサーモテック株式会社 | Method for manufacturing vanadium silicon nitride film coated member, and vanadium silicon nitride film coated member |
-
2021
- 2021-08-31 CN CN202111012409.1A patent/CN113930716A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102217A (en) * | 1986-04-08 | 1987-10-21 | 大连海运学院 | Vacuum ionic carburization without external heat source |
| DE19526387A1 (en) * | 1994-07-19 | 1996-02-29 | Sumitomo Metal Mining Co | Steel components with wear and oxidation resistant double coating |
| US20150027591A1 (en) * | 2012-03-22 | 2015-01-29 | Nippon Steel & Sumitomo Metal Corporation | Steel material for nitriding and nitrided component |
| CN105171364A (en) * | 2015-09-16 | 2015-12-23 | 贵州群建精密机械有限公司 | Machining method of timing gear of heavy truck automobile engine |
| CN106191759A (en) * | 2016-08-23 | 2016-12-07 | 常州新区河海热处理工程有限公司 | Reduce the vacuum glow glow discharge nitriding technique of industrial robot precision gear deformation |
| CN108588634A (en) * | 2018-06-12 | 2018-09-28 | 昆山易博群拓新材料科技有限公司 | A kind of stainless steel anode leafing component nitridation device and nitriding method |
| CN111118373A (en) * | 2018-10-30 | 2020-05-08 | 湖北威能达传动有限责任公司 | High-torque precision gear and preparation method thereof |
| RU2711064C1 (en) * | 2019-02-05 | 2020-01-15 | федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный авиационный технический университет" | Method of increasing wear resistance of a gear-type part |
| JP2021025063A (en) * | 2019-07-31 | 2021-02-22 | Ｄｏｗａサーモテック株式会社 | Method for manufacturing vanadium silicon nitride film coated member, and vanadium silicon nitride film coated member |
| CN111636046A (en) * | 2020-05-09 | 2020-09-08 | 北京卫星制造厂有限公司 | Local ion nitriding method for deep cavity threads of titanium alloy part |
Non-Patent Citations (7)
| Title |
|---|
| 杜永均;周学勇;: "齿轮小间隙表面离子渗氮新工艺", 金属热处理, no. 01 * |
| 杨烈宇: "离子软氮化的研究与应用", 大连海事大学学报, no. 02 * |
| 沈琳;: "38CrMoAlA钢制齿轮的气体渗氮工艺", 金属热处理, no. 07 * |
| 胡誉济,荀敏闽,张秀桐: "离子氮化对齿轮弯曲疲劳强度的影响", 起重运输机械, no. 05 * |
| 赵婧;: "42CrMo钢预氧化对离子渗氮影响的研究", 陶瓷, no. 02 * |
| 赵振东: ""快速气体碳氮共渗工艺及应用"，赵振东，《工程机械》"快速气体碳氮共渗工艺及应用"", 《工程机械》, no. 1, pages 34 * |
| 钟厉;马晨阳;韩西;罗明宝;: "40Cr钢循环离子渗氮工艺及渗层硬度研究", 表面技术, no. 02 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011779A (en) * | 2022-06-23 | 2022-09-06 | 东风商用车有限公司 | High-speed heavy-load automobile nitrided inner gear ring and production process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Active screen plasma nitriding of austenitic stainless steel | |
| Farrahi et al. | An investigation into the effect of various surface treatments on fatigue life of a tool steel | |
| US7169351B2 (en) | Method of production of surface densified powder metal components | |
| CN101648334A (en) | Manufacturing technique of austenitic stainless steel cold-rolled plate with good surface performance | |
| CN113930716A (en) | Ion nitriding method for ultrahigh-strength stainless steel gear | |
| Biró | Trends of nitriding processes | |
| CN112746253A (en) | Steel-based surface composite modified layer and preparation method thereof | |
| Yılmaz et al. | The effect of surface hardening treatments on the mechanical properties of iron based P/M specimens | |
| JP2022133587A (en) | Shot-peening method | |
| CN111593296A (en) | Martensitic stainless steel surface hardening agent and preparation method and application method thereof | |
| CN105695923A (en) | Ionic nitriding machining method for steel air valve | |
| Roliński et al. | Negative effects of reactive sputtering in an industrial plasma nitriding | |
| Sedlaček et al. | Influence of surface texturing sequence on fatigue life and tribological properties of coated tool steel | |
| CN113930715A (en) | Ion nitriding method for small-module gear | |
| CN114107883B (en) | Local ion nitriding method for inner cavity of precipitation hardening stainless steel annular part | |
| Łępicka et al. | Effect of plasma nitriding process conditions on corrosion resistance of 440B martensitic stainless steel | |
| Lu et al. | Characteristic evaluation of friction and wear in the CN and TiN coated gear | |
| US20190292641A1 (en) | Method of treating a workpiece comprising a titanium metal and object | |
| RU2684033C1 (en) | Method and device for processing metal articles | |
| Nowak | Control of kinetics of plasma assisted nitriding process of Ni-base alloys by substrate roughness | |
| Hart et al. | True Single-Piece Flow Case Hardening for In-Line Manufacturing | |
| KR102228437B1 (en) | Surface coating method of the ball valve using pack cementation | |
| JP2005272855A (en) | Sliding member and manufacturing method therefor | |
| Başaran et al. | Investigation of fatigue properties of shot peened and plasma nitrocarburized P/M FC0205 steel | |
| Zhengang et al. | High Temperature Tribological Behavior of Borocarburized Layer on Q235 Steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |