CN101942555A - Heat treatment process of GCr15 steel bearing ring - Google Patents
Heat treatment process of GCr15 steel bearing ring Download PDFInfo
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- CN101942555A CN101942555A CN 201010255753 CN201010255753A CN101942555A CN 101942555 A CN101942555 A CN 101942555A CN 201010255753 CN201010255753 CN 201010255753 CN 201010255753 A CN201010255753 A CN 201010255753A CN 101942555 A CN101942555 A CN 101942555A
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Abstract
The invention provides a heat treatment process of a GCr15 steel bearing ring, comprising the following steps of: (1) heating a bearing to 830 DEG C-860 DEG C and keeping the temperature; (2) quenching in oil; and (3) tempering and keeping the temperature. By adopting the selection of the tempering temperature and the temperature keeping time and the control of carbon potential, the invention ensures that under the condition of quasi high-temperature tempering, at the working temperature of 160 DEG C, the size variation of an inner-ring roller path and an outer-ring roller path of the heat-treated GCr15 steel bearing ring is not more than 0.008 mm, and the hardness is not less than 57HRC and is more than that of a high-temperature tempered GCr15 steel bearing ring. Meanwhile, the heat treatment process is simple and has lower cost compared with the traditional low-temperature treatment and high-temperature tempering process.
Description
Technical field
The present invention relates to the thermal treatment process field, relate in particular to the thermal treatment process of GCr15 steel bearing ring.
Background technology
Common GCr15 steel bearing working temperature is all below 150 ℃, and working temperature is called high-temperature bearing at the bearing that uses more than 150 ℃.GCr15 steel bearing ring is normally quenched after the tempering, and when use temperature surpasses 150 ℃, its hardness will sharply descend, the size instability, and cause the bearing can't works better.This is because behind the conventional marquench of GCr15 steel bearing ring, the content of residual austenite is generally 6%～15% in its tissue.Residual austenite is soft metastable phasing, (in the use as tempering, natural aging or part) under certain conditions, and its unstability is decomposed into martensite or bainite.The hardness of decomposing the consequence bring and be part improves, and toughness descends, and size changes and influences the dimensional precision even the works better of part.
The method of eliminating the residual austenite of GCr15 steel bearing ring has two kinds usually, first kind of way is to adopt the back sub-zero treatment of quenching, utilize low temperature to make and do not change residual austenite continuation completely, thereby eliminate residual austenite, increase the dimensional stability of bearing parts to martensitic transformation.
Another kind of way is to improve tempering temperature, and common tempering temperature is 120 ℃～160 ℃, and the tempering temperature of high tempering is more than 250 ℃, makes not change completely residual austenite in the quenching process and change martensite or lower bainite and carbide into.
More than two kinds of methods in the actual manufacturing of bearing is used, still have some problems.At first, sub-zero treatment increases dimensional stability though can eliminate residual austenite, because the twin crystal martensite that generates behind the deep cooling belongs to hard crisp phase, its impact resistance is relatively poor, loses efficacy so brittle rupture easily takes place the bearing after the sub-zero treatment.Particularly be difficult to be applied having under the condition of certain shock load.And the deepfreeze capacity of equipment is limited, mostly is the periodic implement, is difficult to satisfy the lot production needs.Reach good deepfreeze effect, need to use dry ice or liquid nitrogen, production cost height usually.Secondly, conventional raising tempering temperature is eliminated the thermal treatment process of residual austenite, can bring the reduction of bearing parts hardness usually, and the reduction of part hardness can cause the variation of bearing parts wear resistance, and shorten work-ing life.
Summary of the invention
Technical problem to be solved by this invention provides a kind of thermal treatment process of GCr15 steel bearing ring, compares with background technology and can reduce the thermal treatment cost, improves stability and the work-ing life of GCr15 steel bearing ring when working temperature is higher than 150 ℃.For this reason, the present invention is by the following technical solutions: a kind of thermal treatment process of GCr15 steel bearing ring may further comprise the steps:
(1), bearing is heated to 830 ℃～860 ℃, insulation;
(2), in oil, quench;
(3), tempering, the insulation;
Described thermal treatment process is controlled carbon potential in step (1) be 0.62～0.71; Tempering temperature is 205 ℃ ± 5 ℃ in step (3), and tempering insulation time is 180min ± 10min.
Martensite is quenched, and the dimensional stability of part mainly is subjected to three kinds of different influences that change after the tempering.1. carbon moves from martensite lattice and forms ε-carbide, 2. residual austenite is decomposed, 3. ε-carbide forms Fe
3C.Find through practice, between 50 ℃～120 ℃,, cause the volume-diminished of part because the precipitation of ε-carbide is separated out; Between 100 ℃～250 ℃, residual austenite is decomposed, and changes martensite or bainite into, will be accompanied by volume and rise greatly; More than 200 ℃, ε-carbide transforms to cementite, causes volume-diminished.These three kinds change mutual superposition and cause the bearing parts dimensional change.Therefore,, make bearing parts before the finished product assembling, finish this three kinds of transformations as far as possible, just can prevent to cause accessory size to change because of tissue changes to decompose in the bearing use by suitable tempering process.
The present invention does not take subzero treatment and the high-temperature tempering process used always, but at the thermal treatment process of the cryogenic bearing below 150 ℃, carried out the preferred of processing condition by a large amount of experiments, by the selection of tempering temperature and soaking time and the control of carbon potential, under the condition of accurate high tempering, make through GCr15 steel bearing ring after the thermal treatment of the present invention under 160 ℃ working temperature, Internal and external cycle raceway dimensional change amount≤0.008mm, hardness 〉=57HRC, the GCr15 steel bearing ring that hardness is handled greater than high tempering, simultaneously, process of thermal treatment is simple, and subzero treatment of Cai Yonging and high-temperature tempering process cost were low more in the past.
Embodiment
Embodiment 1～6, the selection of carbon potential
GCr15 steel bearing ring at first is heated to 830 ℃～860 ℃ in this group embodiment, is incubated 45 minutes; The insulating process according to the form below is tested and is adjusted carbon potential (with oxygen probe and the monitoring of carbon control instrument, furnace atmosphere is a nitrogen base methyl alcohol atmosphere, adopt propane as enriching agent, adjust carbon potential in the stove by solenoid control propane break-make), carbon-potential control and corresponding hardness (before the tempering) result contrast see the following form:
| Sequence number | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Carbon-potential control | 0.58 | 0.62 | 0.65 | 0.68 | 0.71 | 0.75 |
| Hardness (HRC) | 61.5 | 62 | 62.5 | 63 | 62.5 | 62.5 |
Conclusion, carbon-potential control is influential for the hardness of GCr15 steel bearing ring, and best carbon-potential control is 0.62～0.71.Be lower than 0.62, the hardness of bearing ring is not enough, is higher than 0.71, and hardness improves little, and cost but obviously increases.
Embodiment 7～15, the selection of tempering temperature
In this group embodiment, GCr15 steel bearing ring at first is heated to 830 ℃～860 ℃, be incubated 45 minutes, carbon-potential control is 0.68 (with oxygen probe and the monitoring of carbon control instrument, furnace atmosphere is a nitrogen base methyl alcohol atmosphere, adopt propane as enriching agent, adjust carbon potential in the stove by solenoid control propane break-make.); Quench in 90 ℃ oil afterwards, carry out tempering then, tempering insulation time is 180min, and tempering temperature and result's contrast see the following form:
Conclusion, by suitable technology controlling and process, in conventional tempering range, exist can make GCr15 steel bearing ring at high temperature still the temperature of steady operation select the zone, through the GCr15 steel bearing ring after the thermal treatment of embodiment 11～13 during at 160 ℃ Internal and external cycle raceway dimensional change amount (mm) suitable with embodiment 14,15, and hardness is better.205 ℃ of the bests of comprehensive selection tempering temperature.
Embodiment 16～23, the selection of tempering insulation time
GCr15 steel bearing ring at first is heated to 830 ℃～860 ℃ in this group embodiment, be incubated 45 minutes, carbon-potential control is 0.68 (with oxygen probe and the monitoring of carbon control instrument, furnace atmosphere is a nitrogen base methyl alcohol atmosphere, adopt propane as enriching agent, adjust carbon potential in the stove) by solenoid control propane break-make; Quench in 90 ℃ oil afterwards, carry out tempering then, tempering temperature is 205 ℃, and tempering insulation time and result's contrast see the following form:
Conclusion, tempering time is all influential for the elevated operating temperature stability and the hardness of GCr15 steel bearing ring, best tempering time is 180min ± 10min, the elevated operating temperature stability that is shorter than this tempering time GCr15 steel bearing ring is undesirable, surpassing this time hardness has decline to surpass regulation, and elevated operating temperature stability is not had raising.
Embodiment 24～29, Comprehensive Control
GCr15 steel bearing ring at first is heated to 830 ℃～860 ℃ in this group embodiment, be incubated 45 minutes, carbon-potential control is 0.68 (with oxygen probe and the monitoring of carbon control instrument, furnace atmosphere is a nitrogen base methyl alcohol atmosphere, adopt propane as enriching agent, adjust carbon potential in the stove) by solenoid control propane break-make; Quench in 90 ℃ oil afterwards, carry out tempering then, carbon-potential control, tempering temperature and tempering insulation time and prepared bearing are at 160 ℃, and the postrun result's contrast of 260h sees the following form:
Above embodiment proves that in the selected processing condition scope of the present invention, GCr15 steel bearing after heat treatment is at 160 ℃, and 260h operation back Internal and external cycle raceway dimensional change amount (0.006mm) is less than 0.008mm, and hardness also can satisfy.
Claims (1)
1.GCr15 the thermal treatment process of steel bearing ring may further comprise the steps:
(1), bearing is heated to 830 ℃～860 ℃, insulation;
(2), in oil, quench;
(3), tempering, the insulation;
It is characterized in that it is 0.62～0.71 that described thermal treatment process is controlled carbon potential in step (1); Tempering temperature is 205 ℃ ± 5 ℃ in step (3), and tempering insulation time is 180min ± 10min.
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| CN 201010255753 CN101942555A (en) | 2010-08-16 | 2010-08-16 | Heat treatment process of GCr15 steel bearing ring |
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| CN 201010255753 CN101942555A (en) | 2010-08-16 | 2010-08-16 | Heat treatment process of GCr15 steel bearing ring |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108433A (en) * | 2011-04-01 | 2011-06-29 | 瓦房店轴承集团有限责任公司 | Method for quenching bearing steel |
| CN102399968A (en) * | 2011-10-29 | 2012-04-04 | 洛阳市洛凌轴承科技股份有限公司 | Thermal treatment process of high-carbon chromium bearing ring |
| CN102758073A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Heat treatment method of bearing |
| CN102925658A (en) * | 2012-11-06 | 2013-02-13 | 武汉理工大学 | Tissue and accuracy stabilized treatment method for high-carbon chromium steel bearing assembly |
| CN103170802A (en) * | 2013-03-04 | 2013-06-26 | 南京紫薇精密机械有限公司 | Processing method for improving stability of Gcr15 main shaft |
| CN103866106A (en) * | 2014-03-12 | 2014-06-18 | 安徽利达汽车轴承制造有限公司 | Quench tempering deformation control method of bearing ring |
| CN104057255A (en) * | 2014-06-26 | 2014-09-24 | 无锡市崇安区科技创业服务中心 | Manufacturing process of GCr15 steel precision bearing ring |
| CN104372160A (en) * | 2014-07-31 | 2015-02-25 | 宁夏金环轴承制造有限公司 | Heat treatment method for gear tapered roller bearing and bearing toothed outer ring |
| CN108994555A (en) * | 2018-08-02 | 2018-12-14 | 苏州钜升精密模具有限公司 | A kind of processing method that can make steel mold cavity dimensionally stable |
| CN115505718A (en) * | 2022-10-17 | 2022-12-23 | 洛阳Lyc轴承有限公司 | Composite heat treatment method for controlling residual austenite of bearing ring |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1818140A (en) * | 2006-01-23 | 2006-08-16 | 陈治贵 | Surface enhancing and lubricating process for long-life bearing |
| CN101328531A (en) * | 2007-06-20 | 2008-12-24 | 人本集团有限公司 | Method for avoiding bearing ring grinding deformation |
| CN101748248A (en) * | 2008-12-17 | 2010-06-23 | 上海人本集团有限公司 | Surface refining process for high-carbon chromium (GCr15) bearing after carbonitriding treatment |
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2010
- 2010-08-16 CN CN 201010255753 patent/CN101942555A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818140A (en) * | 2006-01-23 | 2006-08-16 | 陈治贵 | Surface enhancing and lubricating process for long-life bearing |
| CN101328531A (en) * | 2007-06-20 | 2008-12-24 | 人本集团有限公司 | Method for avoiding bearing ring grinding deformation |
| CN101748248A (en) * | 2008-12-17 | 2010-06-23 | 上海人本集团有限公司 | Surface refining process for high-carbon chromium (GCr15) bearing after carbonitriding treatment |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108433B (en) * | 2011-04-01 | 2012-07-25 | 瓦房店轴承集团有限责任公司 | Method for quenching bearing steel |
| CN102108433A (en) * | 2011-04-01 | 2011-06-29 | 瓦房店轴承集团有限责任公司 | Method for quenching bearing steel |
| CN102399968A (en) * | 2011-10-29 | 2012-04-04 | 洛阳市洛凌轴承科技股份有限公司 | Thermal treatment process of high-carbon chromium bearing ring |
| CN102758073B (en) * | 2012-07-18 | 2014-06-25 | 天马轴承集团股份有限公司 | Heat treatment method of bearing |
| CN102758073A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Heat treatment method of bearing |
| CN102925658A (en) * | 2012-11-06 | 2013-02-13 | 武汉理工大学 | Tissue and accuracy stabilized treatment method for high-carbon chromium steel bearing assembly |
| CN103170802A (en) * | 2013-03-04 | 2013-06-26 | 南京紫薇精密机械有限公司 | Processing method for improving stability of Gcr15 main shaft |
| CN103866106A (en) * | 2014-03-12 | 2014-06-18 | 安徽利达汽车轴承制造有限公司 | Quench tempering deformation control method of bearing ring |
| CN103866106B (en) * | 2014-03-12 | 2015-09-16 | 安徽利达汽车轴承制造有限公司 | A kind of bearing ring Q-tempering deformation amount controlling method |
| CN104057255A (en) * | 2014-06-26 | 2014-09-24 | 无锡市崇安区科技创业服务中心 | Manufacturing process of GCr15 steel precision bearing ring |
| CN104372160A (en) * | 2014-07-31 | 2015-02-25 | 宁夏金环轴承制造有限公司 | Heat treatment method for gear tapered roller bearing and bearing toothed outer ring |
| CN104372160B (en) * | 2014-07-31 | 2016-09-07 | 宁夏金环轴承制造有限公司 | Gear taper roll bearing and the heat treatment method of bearing band tooth outer ring |
| CN108994555A (en) * | 2018-08-02 | 2018-12-14 | 苏州钜升精密模具有限公司 | A kind of processing method that can make steel mold cavity dimensionally stable |
| CN115505718A (en) * | 2022-10-17 | 2022-12-23 | 洛阳Lyc轴承有限公司 | Composite heat treatment method for controlling residual austenite of bearing ring |
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Application publication date: 20110112 |