CN102912092A - After-forging waste heat isothermal normalizing technology for 42CrMo steel extra large size bearing ring forge piece - Google Patents
After-forging waste heat isothermal normalizing technology for 42CrMo steel extra large size bearing ring forge piece Download PDFInfo
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Abstract
The invention belongs to the technical field of heat treatment technology, and provides an after-forging waste heat isothermal normalizing technology for a 42CrMo steel extra large size bearing ring forge piece. The technological process of the waste heat isothermal normalizing technology is as follows: rapidly and alternately cooling the forged 42CrMo steel extra large size bearing ring forge piece in water and air directly; cooling the 42CrMo steel extra large size bearing ring forge piece to 580 degree-C, and placing the 42CrMo steel extra large size bearing ring forge piece into a furnace of 580 degree-C; and when an instrument indicates the temperature at 580 degree-C, insulating for 2 hours and then discharging out of the furnace for air cooling. As the technology makes full use of forging waste heat of the extra large size forge piece, the problems that the conventional normalization of the forced extra large size bearing forge piece is low in production efficiency and high in production cost are solved, and the production period is shortened. After the follow-up thermal refining treatment, the forge piece processed through the after-forging waste heat isothermal normalizing technology can meet requirements in JB/T6396 Specification for Heavy Alloy Structural Steel in aspects of mechanical performance indexes.
Description
Technical field
The invention belongs to the thermal treatment process technology field, in particular excess heat isothermal normalizing technique after the forging of a kind of 42CrMo steel extra large size bearing (external diameter is more than the 440mm) lasso forging.
Background technology
At present, the heat processing technique flow process of 42CrMo steel super large type bearing ring forging is: forge processing → normalizing treatment → modifier treatment.The technique of the conventional normalizing treatment of 42CrMo steel super large type bearing ring forging is: the forging of cool to room temperature is put in the stove after will forging, be warmed up to the normalizing temperature (850 ℃-900 ℃) of steel with stove, and insulation for some time, the processing method of then cooling off in air is seen Fig. 1.Because the conventional normalizing treatment of at present 42CrMo steel super large type bearing ring forging employing need to be heated to part the normalizing temperature (850 ℃-900 ℃) of steel again from room temperature, therefore, the production efficiency of conventional normalizing process method is low, production cost is high.
Because the size of 42CrMo steel super large type bearing ring forging is larger; cooling is very slow in air; before being cooled to 580 ℃, high-temperature forging after will causing forging separates out the proeutectoid ferrite that forging performance is had disadvantageous effect; need in depth study the process for cooling of high-temperature forging when therefore, adopting excess heat isothermal normalizing technique.
Take 42CrMo steel extra large size bearing forging lasso as example, the technique of conventional normalizing treatment is: be placed on the forging that is as cold as room temperature in the air after will forging, be warming up to 650 ℃ of insulations 2 hours with stove, rise to again 860 ℃ of insulations 6 hours, then the air cooling of coming out of the stove, whole normalizing treatment process needs 20 hours altogether.
Summary of the invention
The objective of the invention is to propose excess heat isothermal normalizing technique after a kind of forging of 42CrMo steel super large type bearing ring forging, solve conventional normalizing and have inefficient, expensive problem.
The present invention realizes that the technical scheme that above-mentioned purpose is taked is: will finish the high temperature that forges processing
42CrMo steel super large type bearing ring forging directly carries out fast alternately cooling in water and air, put into temperature when being chilled to 580 ℃ and be 580 ℃ stove, when instrument indicated temperature to 580 ℃, is incubated the air cooling of coming out of the stove after 2 hours.
The process for cooling of 2CrMo steel super large type bearing ring forging is: water-cooled is 12～18 seconds for the first time, air cooling 17～23 seconds; Water-cooled is 12～18 seconds for the second time, air cooling 22～28 seconds; Water-cooled is 5～11 seconds for the third time, air cooling 22～25 seconds; Behind each air cooling, the temperature of measuring shaft bearing ring forging if temperature is higher than 580 ℃, is then carried out cooling next time again; If temperature still is higher than 580 ℃ after the cooling for the third time, can repeat for the third time process for cooling, until the temperature of lasso is down to till 580 ℃.
The present invention is owing to having utilized the waste heat after the forging, and the high-temperature forging that only need to will be in the austenitizing state alternately is cooled to fast 580 ℃ and gets final product in water and air, changed the processing mode of conventional normalizing, and the excess heat isothermal normalizing process needs 4 hours after the whole forging.Shortened 16 hours than conventional normalizing process, effectively reduced production cost and improved production efficiency.
After adopting the excess heat isothermal normalizing art breading is crossed after the forging of the present invention forging to pass through follow-up modifier treatment, every mechanical performance index all can satisfy technical requirements again.
Description of drawings
Fig. 1 is conventional normalizing process signal after forging.
Fig. 2 is that the present invention forges rear excess heat isothermal normalizing technique signal.
Embodiment
In conjunction with the embodiment that provides, technique of the present invention is illustrated, but the present invention does not limit to following examples.
Embodiment 1; The production process of excess heat isothermal normalizing is illustrated as example after the forging of 42CrMo steel super large type bearing ring 8787/1716/01.
The high temperature 42CrMo steel bearing ring forging of finishing forging processing is directly carried out fast alternately cooling in water and air, the time of alternately cooling off presses table 1 and carries out.
The each water and air of table 1 is the time of cooling (unit is second) alternately
Behind each air cooling, measure the temperature of forging, if temperature is higher than 580 ℃, then carry out again cooling next time by technique in the table, if temperature still is higher than 580 ℃ after for the third time cooling, can repeat for the third time process for cooling, until the temperature of lasso is down to till 580 ℃, then put it into temperature and be in 580 ℃ the stove, when stove instrument indicated temperature to 580 ℃, be incubated the air cooling of coming out of the stove after 2 hours.
Embodiment 2; The production process of excess heat isothermal normalizing is illustrated as example after the forging of 42CrMo steel super large type bearing ring 9787/2135/01.
The high temperature 42CrMo steel bearing forging of finishing forging processing is directly carried out fast alternately cooling in water and air, the time of alternately cooling off presses table 2 and carries out.
The each water and air of table 2 is the time of cooling (unit is second) alternately
Behind each air cooling, measure the temperature of forging, if temperature is higher than 580 ℃, then carry out again cooling next time by technique in the table, if temperature still is higher than 580 ℃ after for the third time cooling, can repeat for the third time process for cooling, until the temperature of lasso is down to till 580 ℃, then put it into temperature and be in 580 ℃ the stove, when stove instrument indicated temperature to 580 ℃, be incubated the air cooling of coming out of the stove after 2 hours.
Embodiment 3; The production process of excess heat isothermal normalizing is illustrated as example after the forging of 42CrMo steel super large type bearing ring 130.45/1800.03/01.
The high temperature 42CrMo steel bearing forging of finishing forging processing is directly carried out fast alternately cooling in water and air, the time of alternately cooling off presses table 3 and carries out.
The each water and air of table 3 is the time of cooling (unit is second) alternately
Behind each air cooling, measure the temperature of forging, if temperature is higher than 580 ℃, then carry out again cooling next time by technique in the table, if temperature still is higher than 580 ℃ after for the third time cooling, can repeat for the third time process for cooling, until the temperature of lasso is down to till 580 ℃, then put it into temperature and be in 580 ℃ the stove, when stove instrument indicated temperature to 580 ℃, be incubated the air cooling of coming out of the stove after 2 hours.
According to the lasso after the excess heat isothermal normalizing art breading after the above-mentioned forging, pass through again follow-up modifier treatment after, every mechanical property of forging all can reach technical requirements, it the results are shown in Table 4.
Mechanical property detected result after excess heat isothermal normalizing+modifier treatment after table 4 is forged
Annotate: JB/T6396 " large-scale structural alloy steel technical qualification ".
Claims (2)
1. excess heat isothermal normalizing technique after the forging of a 42CrMo steel super large type bearing ring forging, it is characterized in that: the technological process of described excess heat isothermal normalizing technique is:
1), will finish the high temperature that forges processing
42CrMo steel super large type bearing ring forging directly carries out fast alternately cooling in water and air;
2), 42CrMo steel super large type bearing ring forging is cooled to 580 ℃, puts into temperature and be 580 ℃ stove; When instrument indicated temperature to 580 ℃, being incubated came out of the stove after 2 hours carries out air cooling.
2. according to excess heat isothermal normalizing technique after the forging of a kind of 42CrMo steel super large type bearing ring forging claimed in claim 1, it is characterized in that: described
42CrMo steel super large type bearing ring forging carries out fast alternately, and the technological process of cooling is: water-cooled is 12～18 seconds for the first time, air cooling 17～23 seconds; Water-cooled is 12～18 seconds for the second time, air cooling 22～28 seconds; Water-cooled is 5～11 seconds for the third time, air cooling 22～25 seconds; Behind each air cooling, the temperature of measuring shaft bearing ring forging if temperature is higher than 580 ℃, is then carried out cooling next time again; If temperature still is higher than 580 ℃ after the cooling for the third time, can repeat for the third time process for cooling, until the temperature of lasso is down to till 580 ℃.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385816A (en) * | 2015-10-27 | 2016-03-09 | 浙江万向精工有限公司 | Forging waste heat normalizing process for hub bearing unit ferrule |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN107262642A (en) * | 2017-06-21 | 2017-10-20 | 安徽金越轴承有限公司 | Process for stabilizing is forged in a kind of bearing holder (housing, cover) hot extrusion |
| CN108796179A (en) * | 2018-07-02 | 2018-11-13 | 洛阳Lyc轴承有限公司 | A kind of water-cooling method of GCr15SiMn steel oversize forging blank normalizing |
| CN110343823A (en) * | 2019-07-31 | 2019-10-18 | 北京机电研究所有限公司 | A kind of isothermal normalizing heat treatment process |
| CN111286588A (en) * | 2019-10-25 | 2020-06-16 | 南京工程学院 | Method for eliminating mixed crystal structure of 23CrNiMoV steel for large and medium-sized disc-shaped forgings |
| CN113403456A (en) * | 2021-06-15 | 2021-09-17 | 无锡宝露重工有限公司 | Production method for improving Vickers hardness uniformity of small force value of 42CrMo4 gear ring core |
| CN114507769A (en) * | 2022-01-14 | 2022-05-17 | 北京机电研究所有限公司 | Warm forging waste heat isothermal normalizing method for 18CrNiMo7-6 steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429587A (en) * | 2008-10-31 | 2009-05-13 | 江苏飞船股份有限公司 | Isothermal normalizing treatment process by utilizing forging waste heat of forge piece |
| CN102337385A (en) * | 2011-09-14 | 2012-02-01 | 上海交通大学 | Multi-cycle quenching-partitioning-tempering (M Q-P-T) technique |
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2012
- 2012-11-14 CN CN2012104538118A patent/CN102912092A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429587A (en) * | 2008-10-31 | 2009-05-13 | 江苏飞船股份有限公司 | Isothermal normalizing treatment process by utilizing forging waste heat of forge piece |
| CN102337385A (en) * | 2011-09-14 | 2012-02-01 | 上海交通大学 | Multi-cycle quenching-partitioning-tempering (M Q-P-T) technique |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385816A (en) * | 2015-10-27 | 2016-03-09 | 浙江万向精工有限公司 | Forging waste heat normalizing process for hub bearing unit ferrule |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN107262642A (en) * | 2017-06-21 | 2017-10-20 | 安徽金越轴承有限公司 | Process for stabilizing is forged in a kind of bearing holder (housing, cover) hot extrusion |
| CN108796179A (en) * | 2018-07-02 | 2018-11-13 | 洛阳Lyc轴承有限公司 | A kind of water-cooling method of GCr15SiMn steel oversize forging blank normalizing |
| CN110343823A (en) * | 2019-07-31 | 2019-10-18 | 北京机电研究所有限公司 | A kind of isothermal normalizing heat treatment process |
| CN110343823B (en) * | 2019-07-31 | 2021-04-16 | 北京机电研究所有限公司 | Isothermal normalizing heat treatment process |
| CN111286588A (en) * | 2019-10-25 | 2020-06-16 | 南京工程学院 | Method for eliminating mixed crystal structure of 23CrNiMoV steel for large and medium-sized disc-shaped forgings |
| CN113403456A (en) * | 2021-06-15 | 2021-09-17 | 无锡宝露重工有限公司 | Production method for improving Vickers hardness uniformity of small force value of 42CrMo4 gear ring core |
| CN113403456B (en) * | 2021-06-15 | 2023-03-10 | 无锡宝露重工有限公司 | Production method for improving Vickers hardness uniformity of small force value of 42CrMo4 gear ring core |
| CN114507769A (en) * | 2022-01-14 | 2022-05-17 | 北京机电研究所有限公司 | Warm forging waste heat isothermal normalizing method for 18CrNiMo7-6 steel |
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Application publication date: 20130206 |