CN102211278A - Machining process of double-row outer-ring-free cylindrical roller bearing - Google Patents
Machining process of double-row outer-ring-free cylindrical roller bearing Download PDFInfo
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- CN102211278A CN102211278A CN2010101375961A CN201010137596A CN102211278A CN 102211278 A CN102211278 A CN 102211278A CN 2010101375961 A CN2010101375961 A CN 2010101375961A CN 201010137596 A CN201010137596 A CN 201010137596A CN 102211278 A CN102211278 A CN 102211278A
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Abstract
The invention relates to a machining process of a double-row outer-ring-free cylindrical roller bearing. The machining process comprises the following flows of: selecting carburizing steel; forging; turning internal and external diameters; turning a rolling path; carburizing; turning an oil gallery carburizing layer; carrying out heat treatment; grinding double rolling paths; and assembling. The carbon content of the carburizing steel is generally between Omega c 0.10 percent and Omega c 0.25 percent, and the carburizing steel belongs to the low carbon steel; the carburization depth is not more than the depth of the designed oil gallery; and after the heat treatment is finished, a surface hardness reaches to the oil gallery hardness HRC27-38 and the hardness of other surfaces is HRC61-65. By adopting the machining process of the double-row outer-ring-free cylindrical roller bearing, one part of the carburizing layer of the oil gallery which is connected with an easily-ruptured rib of the product and the rolling path is turned off and the hardness of the carburizing layer is only HRC27-38 after the heat treatment is finished, and so that the oil gallery has a certain hardness and a good toughness; the hardness of other surfaces is HRC61-65 so that the wear resistance of other surfaces of the product is guaranteed, the intensity of the load bearing is unchanged, and the position of the oil gallery can be ensured to have stronger toughness. After 100,000 times of stirring tests, the service life of the double-row outer-ring-free cylindrical roller bearing meets the requirement, and the double-row outer- ring-free cylindrical roller bearings has produced in large quantities.
Description
Technical field
The present invention relates to the bearing process technology, particularly a kind of biserial does not have outer ring cylinder roller bearing processing technology.
Background technology
Biserial does not have race bearing and is mainly used on the new type speed reducer of concrete mixer.Domestic can't the solution under bigger axial load effect, the problem of rib fracture.The detection reason is: be first car oil duct in the former technology, recarburization heat treatment (see figure 2), piece surface carbon content unanimity, the case hardness of part comprises that the hardness on oil duct surface is all equally high after the heat treatment once more, toughness is just smaller comparatively speaking, time that therefore is subjected to axial force ratio be easier to fracture.
Summary of the invention
Do not have the quality of outer ring cylinder roller bearing for improving biserial, the invention provides a kind of biserial does not have outer ring cylinder roller bearing processing technology.
The technical process that biserial of the present invention does not have outer ring cylinder roller bearing processing technology is as follows:
Wherein: biserial according to claim 1 does not have outer ring cylinder roller bearing processing technology, it is characterized in that: described carburizing steel material is 20Cr
2Ni
4A closes the knot steel, and carbon content generally between ω c0.10%～0.25%, belongs to mild steel.
Wherein: described carburization step specifically comprises:
In carburizer, be heated to 930 ± 10 ℃;
Keep carbon potential value Cp=1.1-1.2, ooze 8h by force;
Change carbon potential value Cp=0.9-1.0, continue diffusion 4h;
Come out of the stove when treating that temperature drops to 880-890 ℃, insert in the cold oil and cool off;
Cooling naturally after reheating 650 ℃ of insulation 3-4h.
Wherein: isopropyl alcohol instillation mode is adopted in carburizing atmosphere control.
Wherein: described heat treatment comprises quenches and tempering, and quenching is to be heated to 805-810 ℃, and insulation 45min places the cooling oil quenching; Tempering is to be heated to 155 ± 5 ℃, insulation 4h, cooling naturally; Heat treatment rear surface hardness reaches the hardness HRC27 of oil duct place～38, and remaining surface is HRC61～65.
Biserial of the present invention does not have outer ring cylinder roller bearing processing technology the oil duct place carburized layer car that the rib of product easy fracture is connected with raceway is fallen, after the heat treatment, this place's hardness only is HRC27～38, remaining surface is HRC61～65, promptly guarantee other surface abrasion resistance of product, but the intensity of bearing load is constant, can guarantee that again there is stronger toughness at the oil duct place.Through 100,000 stirring tests, the life-span meets the requirements.Produce in batches.
Description of drawings
Fig. 1 is the flow chart that biserial of the present invention does not have outer ring cylinder roller bearing processing technology;
Fig. 2 is the flow chart that former biserial does not have outer ring cylinder roller bearing processing technology.
Fig. 3 is that biserial of the present invention does not have outer ring cylinder roller bearing processing technology carburizing process figure;
Fig. 4 is that biserial of the present invention does not have outer ring cylinder roller bearing processing technology heat treatment process figure.
The specific embodiment
Below in conjunction with embodiment biserial of the present invention is not had outer ring cylinder roller bearing processing technology and do more detailed explanation.
Fig. 1 is the flow chart that biserial of the present invention does not have outer ring cylinder roller bearing processing technology, and Fig. 2 is the flow chart that former biserial does not have outer ring cylinder roller bearing processing technology.
The flow process that biserial of the present invention does not have outer ring cylinder roller bearing processing technology is as follows:
The difference of two kinds of technologies is the priority of car oil duct.And present technology is after carburizing, before the heat treatment.Carburizing steel select 20Cr for use
2Ni
4A closes the knot steel, and carbon content generally between ω c0.10%～0.25%, belongs to mild steel.For increasing the carbon contents of steel, steel part is heated in carburizing medium, is incubated, the Technology for Heating Processing that makes carbon atom infiltrate the top layer is called carburizing.Its final purpose is that the steel part top layer has high hardness, wearability and fatigue strength, and heart portion keeps certain intensity and high toughness.Part hardness after the carburizing does not reach HRC61～65, therefore heat treatment once more.In first kind of technology, because piece surface carbon content unanimity, the hardness that the case hardness of part comprises the oil duct surface after the heat treatment is all than higher once more, and toughness is just smaller comparatively speaking.Therefore under axial force, rib just might rupture and cause part to be scrapped.And in second kind of technical process, the car oil duct is placed on after the carburizing.After the carburized layer car on oil duct surface fallen, the carbon content on oil duct surface was just low than other surfaces.In ensuing heat treatment process, just can realize the local hardness height that carbon contents is high, and the hardness at oil duct place is not too high, toughness is relatively good.So just can obtain the hardness HRC27 of oil duct place～38, remaining surface is the part of HRC61～65.In bearing parts, oil duct is not used in and bears friction, can be not stressed yet, so its hardness needn't be too big, but, may afford axial force, so its toughness will be got well because it is positioned at the junction of rib and raceway.And why other surfaces want carburizing, the one, because raceway face hardness wants enough big, the wearability of carburizing rear surface has also increased in addition, can improve the performance of bearing.Satisfy these requirements, on technology, just must produce by above-mentioned second kind of technology.
Concrete: described carburizing steel material selection 20Cr
2Ni
4A steel alloy, carbon content generally between ω c0.10%～0.25%, belong to mild steel.
20Cr2Ni4A closes knot steel 20Cr
2Ni
4A closes knot steel carburization step and specifically comprises (see figure 3):
In carburizer, be heated to 930 ± 10 ℃;
Keep carbon potential value Cp=1.1-1.2, ooze 8h by force;
Change carbon potential value Cp=0.9-1.0, continue diffusion 4h;
Come out of the stove when treating that temperature drops to 880-890 ℃, insert in the cold oil and cool off;
Cooling naturally after reheating 650 ℃ of insulation 3-4h.
By above-mentioned technical process, carburizing depth is about 1.3mm, greater than the oil duct degree of depth.Behind the car oil duct, keep a part of carburized layer
Isopropyl alcohol instillation mode is adopted in carburizing atmosphere control.
The further heat treatment of the part that processes, the back tempering (see figure 4) of quenching earlier, quenching is to be heated to 805-810 ℃, insulation 45min places the cooling oil quenching; Tempering is to be heated to 155 ± 5 ℃, insulation 4h, cooling naturally; Piece surface hardness reaches the hardness HRC27 of oil duct place～38 after the heat treatment, and remaining surface is HRC61～65.
Claims (5)
1. a biserial does not have outer ring cylinder roller bearing processing technology, it is characterized in that described technological process is as follows:
Select carburizing steel;
Forge;
External diameter in the car;
The car raceway;
Carburizing;
Car oil duct carburized layer;
Heat treatment;
The two raceways of mill;
Assembling.
2. biserial according to claim 1 does not have outer ring cylinder roller bearing processing technology, it is characterized in that: described carburizing steel material is 20Cr
2Ni
4A closes the knot steel, and carbon content generally between ω c0.10%～0.25%, belongs to mild steel.
3. biserial according to claim 2 does not have outer ring cylinder roller bearing processing technology, it is characterized in that: described carburization step specifically comprises:
In carburizer, be heated to 930 ± 10 ℃;
Keep carbon potential value Cp=1.1-1.2, ooze 8h by force;
Change carbon potential value Cp=0.9-1.0, continue diffusion 4h;
Come out of the stove when treating that temperature drops to 880-890 ℃, insert in the cold oil and cool off;
Cooling naturally after reheating 650 ℃ of insulation 3-4h.
4. biserial according to claim 3 does not have outer ring cylinder roller bearing processing technology, it is characterized in that: isopropyl alcohol instillation mode is adopted in carburizing atmosphere control.
5. biserial according to claim 4 does not have outer ring cylinder roller bearing processing technology, it is characterized in that: described heat treatment comprises quenches and tempering, and quenching is to be heated to 805-810 ℃, and insulation 45min places the cooling oil quenching; Tempering is to be heated to 155 ± 5 ℃, insulation 4h, cooling naturally; Heat treatment rear surface hardness reaches the hardness HRC27 of oil duct place～38, and remaining surface is HRC61～65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101375961A CN102211278A (en) | 2010-04-01 | 2010-04-01 | Machining process of double-row outer-ring-free cylindrical roller bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101375961A CN102211278A (en) | 2010-04-01 | 2010-04-01 | Machining process of double-row outer-ring-free cylindrical roller bearing |
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| CN102211278A true CN102211278A (en) | 2011-10-12 |
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| CN2010101375961A Pending CN102211278A (en) | 2010-04-01 | 2010-04-01 | Machining process of double-row outer-ring-free cylindrical roller bearing |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489938A (en) * | 2011-11-18 | 2012-06-13 | 绍兴文理学院 | Automatic production line process for abrasive machining of deep groove ball bearing |
| CN102672425A (en) * | 2012-04-28 | 2012-09-19 | 重庆市江津区宏盛机械制造有限公司 | Processing technology of turntable |
| CN103042363A (en) * | 2012-12-18 | 2013-04-17 | 潍坊鑫陆轴承有限公司 | Method for manufacturing eccentric bearing |
| CN103737334A (en) * | 2014-01-26 | 2014-04-23 | 无锡市神力齿轮冷挤有限公司 | High-strength gear processing process |
| CN104148895A (en) * | 2014-07-15 | 2014-11-19 | 安庆银泰轴承有限公司 | Production method of rolling bearing |
| CN104476140A (en) * | 2014-12-19 | 2015-04-01 | 常熟市常轴轴承有限公司 | Turning processing technique for flange of angular contact bearing |
| CN106769042A (en) * | 2016-12-26 | 2017-05-31 | 河南科技大学 | A kind of cylinder roller bearing birotor testing machine |
| CN108350945A (en) * | 2015-10-29 | 2018-07-31 | Ntn株式会社 | Method for producing bearer ring and the method for producing double-row conical bearing |
| CN111015118A (en) * | 2019-12-25 | 2020-04-17 | 中国航发哈尔滨轴承有限公司 | Bearing inner ring with V-shaped narrow oil groove and machining method |
| CN114059007A (en) * | 2021-11-23 | 2022-02-18 | 中国航发哈尔滨轴承有限公司 | Vacuum carburizing method for 15CrA steel bearing ring |
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| CN1249005A (en) * | 1997-12-26 | 2000-03-29 | 日本精工株式会社 | Continuous annealing furnace, rolling bearing, annealing method, and method of manufacturing inner and outer races of deeply groove ball bearing |
| US6051080A (en) * | 1996-12-20 | 2000-04-18 | Nissan Motor Co., Ltd. | Rolling element used for toroidal-type continuously variable transmission and method for producing same |
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2010
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Patent Citations (4)
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| US6051080A (en) * | 1996-12-20 | 2000-04-18 | Nissan Motor Co., Ltd. | Rolling element used for toroidal-type continuously variable transmission and method for producing same |
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| CN1450195A (en) * | 2002-04-09 | 2003-10-22 | 唐胜科 | Carburetting-resistant coating for steel work piece |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489938A (en) * | 2011-11-18 | 2012-06-13 | 绍兴文理学院 | Automatic production line process for abrasive machining of deep groove ball bearing |
| CN102672425A (en) * | 2012-04-28 | 2012-09-19 | 重庆市江津区宏盛机械制造有限公司 | Processing technology of turntable |
| CN102672425B (en) * | 2012-04-28 | 2014-07-02 | 重庆市江津区宏盛机械制造有限公司 | Processing technology of turntable |
| CN103042363A (en) * | 2012-12-18 | 2013-04-17 | 潍坊鑫陆轴承有限公司 | Method for manufacturing eccentric bearing |
| CN103737334B (en) * | 2014-01-26 | 2015-12-30 | 无锡市神力齿轮冷挤有限公司 | High-strength gear processing technology |
| CN103737334A (en) * | 2014-01-26 | 2014-04-23 | 无锡市神力齿轮冷挤有限公司 | High-strength gear processing process |
| CN104148895A (en) * | 2014-07-15 | 2014-11-19 | 安庆银泰轴承有限公司 | Production method of rolling bearing |
| CN104476140A (en) * | 2014-12-19 | 2015-04-01 | 常熟市常轴轴承有限公司 | Turning processing technique for flange of angular contact bearing |
| CN108350945A (en) * | 2015-10-29 | 2018-07-31 | Ntn株式会社 | Method for producing bearer ring and the method for producing double-row conical bearing |
| CN106769042A (en) * | 2016-12-26 | 2017-05-31 | 河南科技大学 | A kind of cylinder roller bearing birotor testing machine |
| CN106769042B (en) * | 2016-12-26 | 2023-03-14 | 河南科技大学 | Cylindrical roller bearing dual-rotor testing machine |
| CN111015118A (en) * | 2019-12-25 | 2020-04-17 | 中国航发哈尔滨轴承有限公司 | Bearing inner ring with V-shaped narrow oil groove and machining method |
| CN111015118B (en) * | 2019-12-25 | 2022-03-04 | 中国航发哈尔滨轴承有限公司 | Bearing inner ring with V-shaped narrow oil groove and machining method |
| CN114059007A (en) * | 2021-11-23 | 2022-02-18 | 中国航发哈尔滨轴承有限公司 | Vacuum carburizing method for 15CrA steel bearing ring |
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Application publication date: 20111012 |