CN101575666A - Heat processing technology for improving low-temperature impact work of 42CrMo bearing - Google Patents
Heat processing technology for improving low-temperature impact work of 42CrMo bearing Download PDFInfo
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- CN101575666A CN101575666A CNA200910065224XA CN200910065224A CN101575666A CN 101575666 A CN101575666 A CN 101575666A CN A200910065224X A CNA200910065224X A CN A200910065224XA CN 200910065224 A CN200910065224 A CN 200910065224A CN 101575666 A CN101575666 A CN 101575666A
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Abstract
The invention discloses a heat processing technique for improving low-temperature impact work of a 42CrMo bearing. The technique comprises the following steps of: A. hanging a bearing ring in a furnace and raising the temperature at a speed of less than 60 DEG C per hour to quenching heating temperature: 840 DEG C plus or minus 10 DEG C; B. preserving the quenching heating temperature within the range of 840 DEG C plus or minus 10 DEG C for 2-3h; C. quenching and cooling medium 3 percent PAG; controlling the temperature of the cooling medium by thermocouple detection and then hanging the cooling medium in a cooling medium groove for quenching; D. after quenching, filling the bearing ring in the furnace in time to be tempered with the tempering heating temperature being 630 DEG C plus or minus 10 DEG C; and E. preserving the tempering heating temperature within the range of 630 DEG C plus or minus 10 DEG C for 4-6h. The technique can strikingly improve the low-temperature impact work and mechanical performance of a wind power bearing. At the temperature of minus 20 DEG C, the low-temperature impact work Akv is 91.3J that already exceeds the technical requirement for 'not less than 27J'.
Description
Technical field
The invention belongs to the thermal treatment process technology field, in particular a kind of thermal treatment process that improves 42CrMo bearing low-temperature ballistic work.
Background technology
At present, because energy prices are moved in a high position for a long time, country vigorously supports the development of renewable energy resources industries such as wind-power electricity generation, and therefore, the wind power bearing market potential is huge.Wind power bearing is mounted on the aerogenerator in more than 100 meter high-altitude, will be subjected to huge wind effect for a long time inevitably, and is bearing huge impact load, and will be on active service under the envrionment temperature of subzero tens degree.The special service condition of wind power bearing determines it must have high reliability, otherwise in case bearing generation early failure, only the one-step installation cost of dismantling just surpasses 1,000,000 yuan, and this will bring enormous economic loss to the bearing user.
Low-temperature impact work is to weigh the very important performance index whether wind power bearing has high reliability.For guaranteeing that wind power bearing can have high reliability, bearing industry has been specially made JB/T 10705-2007 " rolling bearing wind-power electricity generation machine bearing " standard.Clearly stipulate in the standard: the low-temperature impact work requirement of wind power bearing lasso is :-20 ℃ low-temperature impact work A
KVBe not less than 27J.
Driftage and change slurry wind power bearing lasso all are to adopt 42CrMo as starting material.Because the special service condition of wind power bearing, the bearing user is more and more higher to the requirement of low-temperature impact work and mechanical property thereof.The existing thermal treatment process of wind power bearing forging is difficult to satisfy the requirement to its high low-temperature impact work.Therefore, for the quality product of further raising company wind power bearing, be necessary very much factor that influences 42CrMo material at low temperature ballistic work and the heat treating method that improves its low-temperature impact work are improved.
Summary of the invention
Be difficult to satisfy this technical barrier that its high low-temperature impact work is required in order to solve the existing thermal treatment process of wind power bearing forging, the invention provides a kind of thermal treatment process of the 42CrMo of raising bearing low-temperature ballistic work.This thermal treatment process can improve the low-temperature impact work and the mechanical property thereof of wind power bearing significantly.
For achieving the above object, the present invention adopts following technical scheme:
Described a kind of thermal treatment process that improves 42CrMo bearing low-temperature ballistic work, its step is as follows:
A, by the elevator head bearing ring is hung in the stove, per hour to be warmed up to quenching temperature: 840 ℃ ± 10 ℃ less than 60 ℃ of speed;
B, quenching temperature are incubated in 840 ℃ ± 10 ℃ sections, and Quenching Soaking Time is: 2～3 hours;
C, the heat-eliminating medium that adopts that quenches are: 3%PAG; Detect the controlled chilling medium temperature by adding armoured thermocouple, then bearing ring is hung in the groove of heat-eliminating medium 3%PAG and quench;
After D, the quenching, the timely shove charge tempering of bearing ring, tempering Heating temperature: 630 ℃ ± 10 ℃;
E, tempering Heating temperature are incubated in 630 ℃ ± 10 ℃ sections, tempering insulation time: 4～6 hours; Come out of the stove behind the bearing ring tempering heat tracing.
Described a kind of thermal treatment process that improves 42CrMo bearing low-temperature ballistic work, the bearing ring forging after coming out of the stove detects, and a. mechanical property detects and is: tensile strength Rm:835Mpa; Yield strength Rp0.2:660Mpa; Unit elongation A:22%; Relative reduction in area Z:71%; Hardness: 258HBW; Texturizing layer: 35mm; B. verifying as of low-temperature impact work: the low-temperature impact work A that room temperature is 25 ℃
Kv: 110J;-20 ℃ low-temperature impact work A
Kv: 91.3J;-40 ℃ low-temperature impact work A
Kv: 67.0J, c. bearing ring product reach bearing industry JB/T 10705-2007 standard, enter next operation.
Because adopt aforesaid technical scheme, the present invention has following superiority:
The present invention is owing to adopted the research method and the technical scheme of science, and by studying for a long period of time, searched out the optimal heat treatment process of the domestic forging low-temperature impact work of further raising, can improve the low-temperature impact work of wind power bearing significantly, guarantee that it can have high reliability, reduce hidden danger of quality.Its superiority is as follows:
1. the research by this project has had big technological breakthrough on traditional quenching-and-tempering process, after having solved wind power bearing and adopting traditional thermal treatment process to handle, and the great technical barrier that low-temperature impact work can not meet the demands.
2. after the desirable art breading that the wind power bearing forging obtains according to this project, its low-temperature impact work and mechanical property can reach technical requirements fully.
Embodiment
A kind of quenching-and-tempering process that improves 42CrMo bearing low-temperature ballistic work is by adopting 17 kinds of different thermal treatment process; 4 kinds of quenching temperatures are handled with the 42CrMo material the wind power bearing lasso with 20 hardening and tempering process and different method of cooling that 5 kinds of tempering temperatures are formed, draw a large amount of wind power bearing lassos 42CrMo material hot treatment testing data, determined a kind of quenching-and-tempering process of the 42CrMo of raising bearing low-temperature ballistic work after deliberation, its hardening and tempering process parameter is as follows:
A. quenching temperature: 840 ℃ ± 10 ℃;
B. Quenching Soaking Time (h): 2～3 hours;
C. tempering Heating temperature: 630 ℃ ± 10 ℃;
D. tempering insulation time (h): 4～6 hours;
E. adopt heat-eliminating medium to be: 3%PAG, PAG are the multipolymer of polyoxyethylene and polyoxytrimethylene.
During work, a kind of quenching-and-tempering process that improves 42CrMo bearing low-temperature ballistic work, its step is as follows:
A, will hang in the stove with the wind power bearing lasso of 42CrMo material preparation by the elevator head, per hour to be warmed up to quenching temperature: 840 ℃ ± 10 ℃ less than 60 ℃ of speed;
B, quenching temperature are incubated in 840 ℃ ± 10 ℃ sections, and Quenching Soaking Time is: 2～3 hours;
When C, quenching, the heat-eliminating medium of employing is: 3%PAG; And detect the controlled chilling medium temperature by adding armoured thermocouple, then bearing ring is hung in the groove of heat-eliminating medium 3%PAG and quench;
After D, the quenching, the timely shove charge tempering of bearing ring, tempering Heating temperature: 630 ℃ ± 10 ℃;
E, tempering Heating temperature are incubated in 630 ℃ ± 10 ℃ sections, tempering insulation time: 4～6 hours; Come out of the stove behind the bearing ring tempering heat tracing.
After by above-mentioned technology wind power bearing being carried out modifier treatment with the 42CrMo material, the mechanical property after coming out of the stove is detected, its assay is as follows: tensile strength Rm:835Mpa; Yield strength Rp0.2:660Mpa; Unit elongation A:22%; Relative reduction in area Z:71%; Hardness: 258HBW; Texturizing layer: 35mm.Again to the detection of wind power bearing forging low-temperature impact work Akv, the low-temperature impact work A of room temperature 25 ℃ (circumferentially)
Kv: 110J; The low-temperature impact work A of-20 ℃ (circumferentially)
Kv: 91.3J; The low-temperature impact work A of-40 ℃ (circumferentially)
Kv: 67.0J.
Through existing processes is compared, low-temperature impact work has obtained significantly improving, and specific targets see the following form.
The forward and backward wind power bearing forging of the present invention low-temperature impact work (J) contrast table
| Adopting process | Normal temperature (+25 ℃) | -20℃ | -40℃ |
| Existing technology | 39 | 27.6 | 22 |
| Technology of the present invention | 110.3 | 91.3 | 67.0 |
As can be seen from the above table, adopt best hardening and tempering process of the present invention to handle wind power bearing with the 42CrMo material after, low-temperature impact work increases significantly.-20 ℃ of low-temperature impact works are considerably beyond the technical requirements of " being not less than 27J ".
Claims (2)
1, a kind of thermal treatment process that improves 42CrMo bearing low-temperature ballistic work, it is characterized in that: its step is as follows:
A, by the elevator head bearing ring is hung in the stove, per hour to be warmed up to quenching temperature: 840 ℃ ± 10 ℃ less than 60 ℃ of speed;
B, quenching temperature are incubated in 840 ℃ ± 10 ℃ sections, and Quenching Soaking Time is: 2～3 hours;
C, the heat-eliminating medium that adopts that quenches are: 3%PAG; Detect the controlled chilling medium temperature by adding armoured thermocouple, then bearing ring is hung in the groove of heat-eliminating medium 3%PAG and quench;
After D, the quenching, the timely shove charge tempering of bearing ring, tempering Heating temperature: 630 ℃ ± 10 ℃;
E, tempering Heating temperature are incubated in 630 ℃ ± 10 ℃ sections, tempering insulation time: 4～6 hours; Come out of the stove behind the bearing ring tempering heat tracing.
2, a kind of thermal treatment process that improves 42CrMo bearing low-temperature ballistic work as claimed in claim 1 is characterized in that: the bearing ring forging after coming out of the stove detects, and a. mechanical property detects and is: tensile strength Rm:835Mpa; Yield strength Rp0.2:660Mpa; Unit elongation A:22%; Relative reduction in area Z:71%; Hardness: 258HBW; Texturizing layer: 35mm; B. verifying as of low-temperature impact work: the low-temperature impact work A that room temperature is 25 ℃
Kv: 110J;-20 ℃ low-temperature impact work A
Kv: 91.3J;-40 ℃ low-temperature impact work A
Kv: 67.0J, c. bearing ring product reach bearing industry JB/T 10705-2007 standard, enter next operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200910065224XA CN101575666A (en) | 2009-06-19 | 2009-06-19 | Heat processing technology for improving low-temperature impact work of 42CrMo bearing |
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| CNA200910065224XA CN101575666A (en) | 2009-06-19 | 2009-06-19 | Heat processing technology for improving low-temperature impact work of 42CrMo bearing |
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Cited By (12)
| 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 |
| CN102581145A (en) * | 2012-03-23 | 2012-07-18 | 马鞍山市国菱机械刃模有限公司 | Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die |
| CN103161817A (en) * | 2013-04-07 | 2013-06-19 | 唐山德泰机械制造有限公司 | Hollow axle for high-speed locomotive and method for manufacturing hollow axle |
| CN103526004A (en) * | 2013-10-21 | 2014-01-22 | 无锡市德力流体科技有限公司 | Method for ensuring impact toughness of low-temperature fastener |
| CN103614530A (en) * | 2013-11-20 | 2014-03-05 | 大连赛瑞金属制品有限公司 | Quenching process in production technology of suspension insulator cryogenic steel foot |
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
| CN104313294A (en) * | 2014-10-20 | 2015-01-28 | 洛阳Lyc轴承有限公司 | Thermal treatment method for dimensional stability of Cr4Mo4V steel bearing ring |
| CN104451046A (en) * | 2014-12-29 | 2015-03-25 | 宝钢轧辊科技有限责任公司 | Manufacturing method of alloy steel for high and cold zone motor shaft |
| CN105220076A (en) * | 2015-11-07 | 2016-01-06 | 李白 | Wind-driven generator wind power bearing |
| CN107937671A (en) * | 2017-12-15 | 2018-04-20 | 株洲中车天力锻业有限公司 | A kind of heat treatment method of EMU rocking arm |
| CN114354680A (en) * | 2021-12-08 | 2022-04-15 | 东风汽车集团股份有限公司 | PAG quenching medium cooling performance analysis method |
| CN114737039A (en) * | 2022-03-28 | 2022-07-12 | 嘉兴恒瑞金属科技股份有限公司 | Heat treatment process for reducing hardness difference of wind power bolt |
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2009
- 2009-06-19 CN CNA200910065224XA patent/CN101575666A/en active Pending
Cited By (15)
| 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 |
| 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 |
| CN102581145A (en) * | 2012-03-23 | 2012-07-18 | 马鞍山市国菱机械刃模有限公司 | Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die |
| CN103161817A (en) * | 2013-04-07 | 2013-06-19 | 唐山德泰机械制造有限公司 | Hollow axle for high-speed locomotive and method for manufacturing hollow axle |
| CN103526004A (en) * | 2013-10-21 | 2014-01-22 | 无锡市德力流体科技有限公司 | Method for ensuring impact toughness of low-temperature fastener |
| CN103614530B (en) * | 2013-11-20 | 2015-09-30 | 大连赛瑞金属制品有限公司 | Quenching technology in the production technique of suspension insulator cryogenic steel foot |
| CN103614530A (en) * | 2013-11-20 | 2014-03-05 | 大连赛瑞金属制品有限公司 | Quenching process in production technology of suspension insulator cryogenic steel foot |
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
| CN104232875B (en) * | 2014-07-17 | 2016-06-15 | 北京科技大学 | A kind of Technology for Heating Processing of shield machine 3m bearing ring |
| CN104313294A (en) * | 2014-10-20 | 2015-01-28 | 洛阳Lyc轴承有限公司 | Thermal treatment method for dimensional stability of Cr4Mo4V steel bearing ring |
| CN104451046A (en) * | 2014-12-29 | 2015-03-25 | 宝钢轧辊科技有限责任公司 | Manufacturing method of alloy steel for high and cold zone motor shaft |
| CN105220076A (en) * | 2015-11-07 | 2016-01-06 | 李白 | Wind-driven generator wind power bearing |
| CN107937671A (en) * | 2017-12-15 | 2018-04-20 | 株洲中车天力锻业有限公司 | A kind of heat treatment method of EMU rocking arm |
| CN114354680A (en) * | 2021-12-08 | 2022-04-15 | 东风汽车集团股份有限公司 | PAG quenching medium cooling performance analysis method |
| CN114737039A (en) * | 2022-03-28 | 2022-07-12 | 嘉兴恒瑞金属科技股份有限公司 | Heat treatment process for reducing hardness difference of wind power bolt |
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Open date: 20091111 |