CN113897481A - Heat treatment method of steel bearing ring - Google Patents
Heat treatment method of steel bearing ring Download PDFInfo
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- CN113897481A CN113897481A CN202111150926.5A CN202111150926A CN113897481A CN 113897481 A CN113897481 A CN 113897481A CN 202111150926 A CN202111150926 A CN 202111150926A CN 113897481 A CN113897481 A CN 113897481A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 133
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005496 tempering Methods 0.000 claims abstract description 66
- 238000004321 preservation Methods 0.000 claims abstract description 42
- 238000010791 quenching Methods 0.000 claims abstract description 11
- 230000000171 quenching effect Effects 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000006698 induction Effects 0.000 claims description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910001566 austenite Inorganic materials 0.000 description 22
- 230000001276 controlling effect Effects 0.000 description 12
- 230000000717 retained effect Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method of a steel bearing ring, and belongs to the technical field of bearing manufacturing. The heat treatment method of the steel bearing ring comprises the steps of quenching the steel bearing ring, wherein the austenitizing heat preservation temperature is 870-910 ℃, and after the heat preservation is finished, oil cooling is carried out to the room temperature; carrying out gradient tempering heat treatment on the steel bearing ring, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 50-90 ℃/s, and heating to 350-400 ℃; the average heating speed on the non-working surface of the ferrule is 40-60 ℃/s, and air cooling is carried out after heating; and (3) carrying out cold treatment on the steel bearing ring, and then carrying out tempering heat preservation treatment on the cold-treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 120-140 ℃. The treatment method improves the dimensional stability of the bearing ring and finally improves the average service life and impact toughness of the steel bearing ring.
Description
Technical Field
The invention relates to the technical field of bearing manufacturing, in particular to a heat treatment method of a steel bearing ring.
Background
Statistics show that the loss of the bearing precision replaces fatigue to become a main reason for the loss of the working performance of the precision bearing, and the reduction of the wear resistance and the overall dimensional stability of the working surface of the bearing ring is a key factor for causing the loss of the bearing precision. The structure state of the bearing ring is the basis for determining the performance of the bearing ring and is a key factor influencing the precision and the service life of the bearing, but the requirements of the wear resistance and the dimensional stability on the base structure of the bearing are obviously different. The bearing matrix is generally made of widely used GCr15 bearing steel and undergoes forming manufacturing links represented by cold rolling rings, martensitic quenching and low-temperature tempering, and the matrix structure is tempered martensite, carbide and retained austenite. In consideration of the wear resistance of the bearing ring working surface, a large amount of retained austenite (12-16 vol.%) is expected to remain on the raceway working surface, and the carbide is finely dispersed, while in consideration of the dimensional stability of the radial whole bearing ring, only a small amount of retained austenite (less than or equal to 4 vol.%) is expected to exist, and no special requirement is imposed on the dimensional morphology of the carbide. The traditional low-temperature tempering is used as a key process link for determining the performance of a bearing matrix structure, the distribution of the bearing matrix structure cannot be regulated and controlled only by integrally changing the content of the bearing matrix structure, and the structure requirements of wear resistance and dimensional stability cannot be met at the same time.
At present, in order to improve the precision life of the GCr15 steel precision bearing, cold treatment is supplemented before low-temperature tempering or stabilizing tempering is supplemented after the low-temperature tempering. However, the traditional process has long period and poor comprehensive effect. The wear resistance and fatigue life of the working surface of the bearing ring can be obviously improved through surface modification, but the influence on controlling the content of residual austenite to improve the dimensional stability is negligible. In addition, different from the structural characteristics, performance requirements and component material microstructure characteristics of high-nitrogen stainless steel threaded bearing components, the GCr15 steel precision bearing ring has relatively thin wall thickness (mostly within 12 mm), the change range of the overall hardness of the ring is narrow (within 5 HRC), the hardness and the wear resistance of the GCr15 bearing steel are sharply reduced after tempering treatment at the temperature of more than 500 ℃, and the conventional high-frequency induction local tempering process cannot meet the requirements on the structure performance of the GCr15 steel precision bearing.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a heat treatment method of a steel bearing ring, which solves the technical problems of poor dimensional stability and low impact toughness of the steel bearing ring in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring, wherein the heating rate is 10-30 ℃/min, the austenitizing heat preservation temperature is 870-910 ℃, and after the heat preservation is finished, oil is cooled to the room temperature;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 50-90 ℃/S, and heating to 350-400 ℃; heating the non-working surface of the ferrule at an average heating speed of 40-60 ℃/s to 250-350 ℃, and then cooling in air after heating;
and S3, performing cold treatment on the steel bearing ring processed in the step S2, wherein the temperature range of the cold treatment is-110 to-79 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 120 to 140 ℃.
Further, in step S1, the austenitizing heat preservation time is 10-40 min.
Further, in step S2, the gradient tempering heat treatment is performed by induction heating.
Further, in step S2, the induction heating time is 4-7S.
Further, in step S2, the induction power frequency is 10-60KHz in the induction heating mode.
Further, in step S2, the current density in the induction heating mode is 108～109A/m2。
Further, in step S2, the induction heating is performed using a pure copper round profile inductor.
Further, in step S3, the time of the cold treatment is 30-120 min.
Further, in step S3, the tempering and heat-preserving treatment time is 60-180 min.
Further, in step S1, the temperature of the oil cooling is 60-70 ℃.
Compared with the prior art, the invention has the beneficial effects that: the high austenitizing temperature is adopted to ensure that the bearing ring has enough retained austenite with high carbon content after quenching, then the bearing ring is cooled, and then the bearing ring has high thermal stability and mechanical stability after the gradient tempering of the step S2 and the stable heat treatment of the step S3, and simultaneously, the bearing ring is ensured not to have coarse aggregated carbide on the working surface of the raceway; by utilizing the induction heating skin effect and the high-efficiency heat conduction in the metal solid, a tempering gradient temperature field is constructed on the limited wall thickness of the bearing ring, the dynamic relation that the tempering structure transformation of GCr15 steel is changed along with the tempering heating temperature-time change is fully utilized, the asynchronous transformation of the residual austenite in the radial direction of the bearing ring is realized, the requirement of the difference of the raceway working surface and the radial whole of the bearing ring on the content of the residual austenite is effectively met, the induction heating provides a fast temperature rise speed for the gradient tempering of the bearing ring, so that tempered carbides are more finely dispersed, not only provides an active structure state for improving the wear resistance of the raceway working surface, but also reduces the hardness deviation of the radial whole of the bearing ring after the gradient tempering, improves the residual stress distribution of the bearing ring by stabilizing heat treatment, and further improves the thermal stability and the mechanical stability of the residual austenite, the invention can effectively regulate and control the content and distribution of the retained austenite of the bearing ring, maintain the high retained austenite content and proper hardness of the raceway working surface of the bearing ring on the premise of reducing the integral retained austenite content, improve the abrasion resistance of the raceway of the bearing ring and the dimensional stability of the radial whole body, and finally improve the average service life and impact toughness of the steel bearing ring.
Detailed Description
The specific embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 10-30 ℃/min, the austenitizing heat preservation temperature is 870-910 ℃, and after the heat preservation is finished, oil at 60-70 ℃ is adopted to cool the steel bearing ring to the room temperature; the austenitizing and heat preserving time is 10-40 min;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, and controlling the average tempering temperature field on the raceway working surfaceThe heating speed is 50-90 ℃/s, the temperature is raised to 350-400 ℃, and the average heating speed on the non-working surface of the ferrule is 40-60 ℃/s; heating to 250-350 ℃, and then cooling in air; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 4-7s, and further, a pure copper round profiling inductor is adopted for carrying out the gradient tempering heat treatment; the induction power frequency of the induction heating mode is 10-60KHz, and the current density is 108～109A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 30-120min, wherein the temperature range of the cold treatment is-110 to-79 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 120-140 ℃, and the time is 60-180 min.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the steel bearing ring in the following examples or comparative examples is a GCr15 steel bearing ring, and the GCr15 steel bearing ring comprises, by mass, 0.95-1.05% C; 1.40-1.65% of Cr1; 0.15 to 0.35 percent of Si; 0.25-0.45% of Mn0.25%, wherein the GCr15 steel bearing ring in the following embodiment comprises 1.05% of C by mass percent; 1.55 percent of Cr1; 0.35 percent of Si; and 0.4 percent of Mn0.
Example 1
The embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 10 ℃/min, the thickness of the steel bearing ring is 9.2mm, the austenitizing heat preservation temperature is 890 ℃, the heat preservation time is 27min, and the steel bearing ring is immediately cooled to room temperature by oil at 70 ℃ after the heat preservation; the overall residual austenite content of the quenched steel bearing ring was 18 vol.%;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, and controlling the average heating speed of a gradient tempering temperature field on the raceway working surfaceThe temperature is increased to 373.4 ℃ at the temperature of 80 ℃/s, the average heating speed on the non-working surface of the ferrule is 58 ℃/s, the temperature is increased to 313.1 ℃, and the ferrule is cooled after being heated; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 4.5s, and further, a pure copper round profiling inductor is adopted for carrying out the gradient tempering heat treatment; the induction power frequency of the induction heating mode is 50KHz, and the current density is 3.8 multiplied by 108A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 80min, wherein the temperature of the cold treatment is-79 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 140 ℃, and the time is 90 min.
Example 2
The embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 20 ℃/min, the thickness of the steel bearing ring is 9.2mm, the austenitizing heat preservation temperature is 870 ℃, the heat preservation time is 35min, and the steel bearing ring is immediately cooled to room temperature by using oil at 65 ℃ after the heat preservation; the overall residual austenite content of the quenched steel bearing ring was 19.1 vol.%;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 90 ℃/S, heating to 375.7 ℃, controlling the average heating speed of the non-working surface of the ring to be 60 ℃/S, heating to 250.7 ℃, and cooling in air after heating; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 4s, and further, a pure copper round profiling inductor is adopted for carrying out the gradient tempering heat treatment; the induction power frequency of the induction heating mode is 60KHz, and the current density is 8 multiplied by 108A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 120min, wherein the temperature of the cold treatment is-105 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 120 ℃, and the time is 180 min.
Example 3
The embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 30 ℃/min, the thickness of the steel bearing ring is 9.2mm, the austenitizing heat preservation temperature is 910 ℃, the heat preservation time is 10min, and the steel bearing ring is immediately cooled to room temperature by oil at 60 ℃ after the heat preservation; the overall residual austenite content of the quenched steel bearing ring was 17.8 vol.%;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 50 ℃/S, heating to 360.4 ℃, controlling the average heating speed of the non-working surface of the ring to be 49 ℃/S, heating to 298.2 ℃, and cooling in air after heating; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 7s, and further, a pure copper round profiling inductor is adopted for carrying out the gradient tempering heat treatment; the induction power frequency of the induction heating mode is 20KHz, and the current density is 1 multiplied by 108A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 30min, wherein the temperature of the cold treatment is-90 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 140 ℃, and the time is 60 min.
Example 4
The embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 30 ℃/min, the thickness of the steel bearing ring is 9.2mm, the austenitizing heat preservation temperature is 900 ℃, the heat preservation time is 40min, and the steel bearing ring is immediately cooled to room temperature by oil at 70 ℃ after the heat preservation; the overall residual austenite content of the quenched steel bearing ring was 18.6 vol.%;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 60 ℃/S, heating to be 372.5 ℃, controlling the average heating speed of the non-working surface of the ring to be 55 ℃/S, heating to be 340.6 ℃, and cooling in air after heating; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 6s, and the step is further carried outThe method is carried out by adopting a pure copper round copying inductor; the induction power frequency of the induction heating mode is 45KHz, and the current density is 1 multiplied by 109A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 60min, wherein the temperature of the cold treatment is-85 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 125 ℃, and the time is 80 min.
Example 5
The embodiment provides a heat treatment method of a steel bearing ring, which comprises the following steps:
s1, quenching the steel bearing ring in an atmosphere furnace, wherein the heating rate is 15 ℃/min, the thickness of the steel bearing ring is 9.2mm, the austenitizing heat preservation temperature is 880 ℃, the heat preservation time is 10min, and the steel bearing ring is immediately cooled to room temperature by oil at 70 ℃ after the heat preservation; the overall residual austenite content of the quenched steel bearing ring was 17.4 vol.%;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 70 ℃/S, heating to be 397.1 ℃, controlling the average heating speed of a ring non-working surface to be 50 ℃/S, heating to be 283.8 ℃, and cooling in air after heating; the heating mode of the gradient tempering heat treatment is induction heating, the heating time is 5.5s, and further, a pure copper round profiling inductor is adopted for carrying out the gradient tempering heat treatment; the induction power frequency of the induction heating mode is 50KHz, and the current density is 5 multiplied by 108A/m2；
And S3, performing cold treatment on the steel bearing ring processed in the step S2 for 30min, wherein the temperature of the cold treatment is-90 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 130 ℃, and the time is 100 min.
Comparative example 1
The heat treatment method of this comparative example differs from example 1 only in that: cold treatment is further included between the step S1 and the step S2, specifically, the steel bearing ring treated in the step S1 is kept at-198 ℃ for 24h, and then the process proceeds to a step S2.
Comparative example 2
The heat treatment method of this comparative example differs from example 1 only in that: a low-temperature tempering treatment is further included between the step S1 and the step S2, specifically, the steel bearing ring treated in the step S1 is tempered for 2h at a tempering temperature of 180 ℃, and then the process proceeds to a step S2.
The results of the residual austenite content, hardness, dimensional stability, etc. of the bearing rings obtained in the above examples 1 to 5 and comparative examples 1 to 2 under the same test conditions are shown in table 1. And under the dimensional stability test condition, the bearing ring is isothermal for 400 hours at the constant temperature of 110 ℃ and then the equivalent diameter change rate of the bearing ring is measured. The average life is the average of the number of stress cycles until fatigue is reached. The room temperature impact toughness adopts a non-standard rectangular sample without gaps.
TABLE 1 comparison of the structural Properties of bearing rings obtained in examples 1 to 5 and comparative examples 1 to 2
It can be seen that comparative examples 1 and 2 improve the dimensional stability and hardness by reducing the content of the retained austenite of the whole bearing matrix, and fail to fully exert the positive effects of the retained austenite on the wear resistance and the fatigue life, which may cause the problems of lower impact toughness of the bearing ring, and the like, and weaken the potential of the GCr15 bearing steel. The invention can effectively regulate and control the content and distribution of the retained austenite of the bearing ring, maintain the high retained austenite content and proper hardness of the raceway working surface of the bearing ring on the premise of reducing the integral retained austenite content, improve the abrasion resistance of the raceway of the bearing ring and the dimensional stability of the radial whole body, and finally improve the precision retentivity of the precision bearing.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A heat treatment method of a steel bearing ring is characterized by comprising the following steps:
s1, quenching the steel bearing ring, wherein the heating rate is 10-30 ℃/min, the austenitizing heat preservation temperature is 870-910 ℃, and after the heat preservation is finished, oil is cooled to the room temperature;
s2, carrying out gradient tempering heat treatment on the steel bearing ring processed in the step S1, controlling the average heating speed of a gradient tempering temperature field on the raceway working surface to be 50-90 ℃/S, and heating to 350-400 ℃; heating the non-working surface of the ferrule at an average heating speed of 40-60 ℃/s to 250-350 ℃, and then cooling in air after heating;
and S3, performing cold treatment on the steel bearing ring processed in the step S2, wherein the temperature range of the cold treatment is-110 to-79 ℃, and then performing tempering heat preservation treatment on the cold treated bearing ring, wherein the temperature of the tempering heat preservation treatment is 120 to 140 ℃.
2. The heat treatment method for a steel bearing ring as claimed in claim 1, wherein the austenitizing heat-retaining time is 10-40min at step S1.
3. The heat treatment method for a steel bearing ring as claimed in claim 1, wherein the gradient tempering heat treatment is performed by induction heating in step S2.
4. The heat treatment method for a steel bearing ring according to claim 3, wherein the induction heating time is 4 to 7 seconds in step S2.
5. The heat treatment method of a steel bearing ring as claimed in claim 3, wherein the induction power frequency is 10-60KHz in the induction heating manner at step S2.
6. The heat treatment method for a steel bearing ring as claimed in claim 5, wherein the current density in the induction heating mode is 10 at step S28～109A/m2。
7. The heat treatment method for a steel bearing ring as claimed in claim 3, wherein the induction heating is performed using a pure copper round profile inductor in step S2.
8. The heat treatment method for a steel bearing ring as claimed in claim 1, wherein the time of the cold treatment is 30-120min at step S3.
9. The heat treatment method for a steel bearing ring according to claim 1, wherein the tempering and heat-retaining treatment is performed for 60 to 180min in step S3.
10. The heat treatment method for a steel bearing ring according to claim 1, wherein the oil-cooled temperature is 60 to 70 ℃ in step S1.
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| WO2021140853A1 (en) * | 2020-01-06 | 2021-07-15 | Ntn株式会社 | Rolling bearing raceway ring and method for manufacturing same |
| JP2021110032A (en) * | 2020-01-06 | 2021-08-02 | Ntn株式会社 | Production method of bearing ring of rolling bearing |
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| JP2015212404A (en) * | 2014-05-01 | 2015-11-26 | Ntn株式会社 | Manufacturing method of bearing ring, bearing ring and rolling shaft bearing |
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| WO2021140853A1 (en) * | 2020-01-06 | 2021-07-15 | Ntn株式会社 | Rolling bearing raceway ring and method for manufacturing same |
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Application publication date: 20220107 |