CN101724742A - Heat treatment process of notch ductile steel bearing balls - Google Patents
Heat treatment process of notch ductile steel bearing balls Download PDFInfo
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- CN101724742A CN101724742A CN200810230525A CN200810230525A CN101724742A CN 101724742 A CN101724742 A CN 101724742A CN 200810230525 A CN200810230525 A CN 200810230525A CN 200810230525 A CN200810230525 A CN 200810230525A CN 101724742 A CN101724742 A CN 101724742A
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Abstract
The invention relates to a heat treatment process of notch ductile steel bearing balls, which comprises a process step 1 of material heat treatment before the machining of the bearing balls and a process step 2 of semi-finished product heat treatment, quenching and tempering after the machining of the bearing balls, wherein the process step 1 comprises normalizing treatment which is to heat the material in a furnace to 860 to 880 DEG c, keep the temperature for 30 to 40 minutes, cool the material in oil till the surface temperature is 300 to 400 DEG C and take out the material to cool the material in the air, and annealing treatment which is to heat the material in the furnace to 730 to 740 DEG C, keep the temperature for 4 to 5 hours and cool the material with the furnace; and the process step 2 comprises quenching treatment which is to heat a workpiece in the furnace to 870 to 880 DEG C, keep the temperature for 25 to 35 minutes and quench the workpiece in fast quenching oil at 60 to 80 DEG C, and tempering treatment which is to heat the workpiece in the furnace to 220 to 240 DEG C and keep the temperature for 4 to 5 hours. The heat treatment process can make the steel balls have the optimal combination of strength and ductility and effectively improve the service life of the steel balls, thereby improving service life of bearings of oil screw drills.
Description
Technical field
The invention belongs to metallic substance heat treatment technics field, especially a kind of thermal treatment process of notch ductile steel bearing balls.
Background technology
High speed development along with China Petroleum, explore the life-span length of the well dynamic helicoid hydraulic motor of oil-gas field as exploitation, directly have influence on the tempo of development and the economic benefit of oil-gas field, and the positive displacement drill bearing life-span is the determinative in decision helicoid hydraulic motor life-span.Use the situation of drilling tool according to petroleum industry, by to a large amount of drilling tool dissection and analysis: it all is to scrap because of bearing failure that 70%～80% drilling tool is arranged, and wherein the overwhelming majority be since the rolling body (steel ball) of bearing because of the abominable working conditions of incompatibility drilling tool, easily the cracked bearing operation that causes is bad, thereby directly has influence on the life-span of oil drilling tools bearing.By applying working condition is investigated as can be seen: the working conditions of this class bearing is extremely abominable, remove and bear very big static load (from high the pressure of the drill), shock load, also under the condition of unlubricated or mud lubrication, work, therefore bearing steel ball will have the characteristics of high-impact, and this just requires steel ball to have the broken loading capacity of higher compression.Adopt GCr15 and G55SiMoV material to make notch ductile steel bearing balls at present, its heat treating method is that conventional annealing is (760～780 ℃ the time, the insulation 4～5h) and tempering (830～850 ℃ of quenchings of quenching, 220～260 ℃ of tempering) technology, acquisition hardness is 55～59HRC, and metallographic microstructure is made up of cryptocrystal or tiny crystallization martensite and small portion of residual austenite and carbide.This processing method advantage is to make steel ball have higher hardness, intensity, and the crushing load value of steel ball reaches current standards (JB/T6366) requirement; Shortcoming is that the obdurability of steel ball is not high, can't adapt to geological state complicated and changeable in actual the use, and is on the low side because of its shock resistance crush capable, causes the steel ball breakage, collapses piece, causes bearing and shifts to an earlier date failure damage.
Summary of the invention
The thermal treatment process that the purpose of this invention is to provide a kind of notch ductile steel bearing balls can make steel ball obtain best combination of strength and toughness, effectively improves the steel ball life-span.
Technical scheme of the present invention is: the thermal treatment process of described a kind of notch ductile steel bearing balls is as follows:
1), material require thermal treatment before the steel bearing balls mechanical workout, its technological process:
A, normalizing treatment: material is heated to temperature when being 860～880 ℃ in stove, insulation 30～40min; Then material is cooled to surface temperature when being 300～400 ℃ in oil, takes out material and in air, cool off;
B, anneal: material is heated to temperature when being 730～740 ℃ in stove, and insulation 4～5h is with stove cooling cooling;
2), work in-process thermal treatment after the steel bearing balls mechanical workout, the tempering process rules of quenching:
A, quench treatment: workpiece is heated to temperature when being 870～880 ℃ in stove, and insulation 25～35min is then with the rapid quenching oil quenching of workpiece at 60～80 ℃;
B, temper: workpiece is heated to temperature when being 220～240 ℃ in stove, insulation 4～5h.
The present invention can be the shock-resistant bearing steel ball of manufacturing a kind of new variety material---G50SiMoA is provided, its principal element is C, Si, Mo etc., wherein carbon content is (0.45～0.55) %, can obtain higher hardness and intensity after the thermal treatment, obtains best combination of strength and toughness again; Mo is the strong carbide forming element, can increase the hardening capacity of steel, and crystal grain thinning obtains optimum tenacity, increases wear resistance; The Si element mainly plays the solution strengthening effect, improves anti-temper resistance, elastic limit and the impact resistance of steel.The present invention is in heat treatment technics, and shock-resistant bearing steel ball material can obtain tiny and uniform spherodized structure after adopting normalizing to add annealed technology, and hardness is suitably 179～245HB; Steel ball adopt to quench to add and can obtain the dislocation lath martensite after the tempered technology and mix with crystallization martensite and small portion of residual austenite and carbide tissue, and hardness is 57～60HRC, has high obdurability, wear resistance.Heat-treatment technology method by grain refining of the present invention, change martensitic stucture form, make steel ball obtain best combination of strength and toughness, make the crushing load value of steel ball require to improve effective the raising steel ball life-span more than 50% than current standards (JB/T6366), thus the work-ing life of improving the oil positive displacement drill bearing.
Embodiment
The present invention is further described by the following embodiment.
Its chemical constitution of bearing steel ball material of the present invention is (weight percentage): C:0.45～0.55, Si:0.85～1.05, Mn:0.30～0.60, Mo:0.35～0.55, P ≯ 0.025, S ≯ 0.025, Cr ≯ 0.02, V ≯ 0.10, Ni ≯ 0.30, Cu ≯ 0.25, all the other are Fe and unavoidable impurities.
Embodiment 1
1), material require thermal treatment before the steel bearing balls mechanical workout of the present invention, its technological process:
A, normalizing treatment: material is heated to temperature when being 865～875 ℃ in stove, insulation 35min; Then material is cooled to surface temperature when being 330～380 ℃ in oil, takes out material and in air, cool off.
B, anneal: material is heated to temperature when being 735～740 ℃ in stove, and insulation 4.5h is with stove cooling cooling.Durometer level is 210～240HB.
2), work in-process thermal treatment after the steel bearing balls mechanical workout, the tempering process rules of quenching:
A, quench treatment: workpiece is heated to temperature when being 875～880 ℃ in stove, insulation 30～35min, and then with the rapid quenching oil quenching of workpiece at 60～80 ℃, the back hardness of quenching is not less than 58HRC.
B, temper: workpiece is heated to temperature when being 230～240 ℃ in stove, insulation 4.5h, and temper number is 57HRC.
3), " three groups of crushing load values of (φ 22.23mm) are 598,595,615KN, and the steel ball made of current standards (JB/T6366) on average improves more than 58% on year-on-year basis for the steel bearing balls 7/8 of processing.
Embodiment 2
1), material require thermal treatment before the steel bearing balls mechanical workout of the present invention, its technological process:
A, normalizing treatment: material is heated to temperature when being 870～880 ℃ in stove, insulation 40min; Then material is cooled to surface temperature when being 350～400 ℃ in oil, takes out material and in air, cool off.
B, anneal: material is heated to temperature when being 735～740 ℃ in stove, and insulation 5h is with stove cooling cooling.Durometer level is 180～195HB;
2), work in-process thermal treatment after the steel bearing balls mechanical workout, the tempering process rules of quenching:
A, quench treatment: workpiece is heated to temperature when being 875～880 ℃ in stove, insulation 30～35min, and then with the rapid quenching oil quenching of workpiece at 60～80 ℃, the back hardness of quenching is not less than 60HRC.
B, temper: workpiece is heated to temperature when being 230～240 ℃ in stove, insulation 5h, and temper number is 58HRC.
3), " three groups of crushing load values of (φ 25.4mm) are 785,805,800KN, and the steel ball made of current standards (JB/T6366) on average improves more than 62% on year-on-year basis for the steel bearing balls 1 of processing.
Embodiment 3
1) material require thermal treatment before the steel bearing balls mechanical workout of the present invention, its technological process:
A, normalizing treatment: material is heated to temperature when being 860～870 ℃ in stove, insulation 30min; Then material is cooled to surface temperature when being 300～350 ℃ in oil, takes out material and in air, cool off.
B, anneal: material is heated to temperature when being 730～735 ℃ in stove, and insulation 4h is with stove cooling cooling.Durometer level is 185～209HB.
2), work in-process thermal treatment after the steel bearing balls mechanical workout, the tempering process rules of quenching:
A, quench treatment: workpiece is heated to temperature when being 870～875 ℃ in stove, insulation 25～30min, and then with the rapid quenching oil quenching of workpiece at 60～80 ℃, the back hardness of quenching is not less than 59HRC.
B, temper: workpiece is heated to temperature in stove be 220～230 ℃, insulation 4h, and temper number is 59HRC.
3), " three groups of crushing load values of (φ 14.29mm) are 332,346,340KN, and the steel ball made of current standards (JB/T6366) on average improves more than 55% on year-on-year basis for the steel bearing balls 9/16 of processing.
Claims (1)
1. the thermal treatment process of a notch ductile steel bearing balls, it is characterized in that: this thermal treatment process is as follows:
1), material require thermal treatment before the steel bearing balls mechanical workout, its technological process:
A, normalizing treatment: material is heated to temperature when being 860～880 ℃ in stove, insulation 30～40min; Then material is cooled to surface temperature when being 300～400 ℃ in oil, takes out material and in air, cool off;
B, anneal: material is heated to temperature when being 730～740 ℃ in stove, and insulation 4～5h is with stove cooling cooling;
2), work in-process thermal treatment after the steel bearing balls mechanical workout, the tempering process rules of quenching:
A, quench treatment: workpiece is heated to temperature when being 870～880 ℃ in stove, and insulation 25～35min is then with the rapid quenching oil quenching of workpiece at 60～80 ℃;
B, temper: workpiece is heated to temperature when being 220～240 ℃ in stove, insulation 4～5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102305259A CN101724742B (en) | 2008-10-22 | 2008-10-22 | Heat treatment process of notch ductile steel bearing balls |
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| CN2008102305259A CN101724742B (en) | 2008-10-22 | 2008-10-22 | Heat treatment process of notch ductile steel bearing balls |
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| CN101724742A true CN101724742A (en) | 2010-06-09 |
| CN101724742B CN101724742B (en) | 2012-05-23 |
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| CN2008102305259A Expired - Fee Related CN101724742B (en) | 2008-10-22 | 2008-10-22 | Heat treatment process of notch ductile steel bearing balls |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328250A (en) * | 2014-11-27 | 2015-02-04 | 王俐帧 | Heat treatment process of bearing steel |
| CN105177377A (en) * | 2015-08-26 | 2015-12-23 | 肖练 | Protective door with interlayer |
| CN106392492A (en) * | 2016-11-23 | 2017-02-15 | 安顺市虹翼特种钢球制造有限公司 | Steel ball production machining method |
| CN108441620A (en) * | 2018-04-13 | 2018-08-24 | 常熟市龙腾滚动体制造有限公司 | A kind of cooling control method for bearing steel ball |
| CN112059542A (en) * | 2020-08-19 | 2020-12-11 | 云南昆钢耐磨材料科技股份有限公司 | Production process of high-carbon microalloyed steel ball |
| CN117758039A (en) * | 2023-12-25 | 2024-03-26 | 北京航空航天大学宁波创新研究院 | Heat treatment method for improving crushing load value of high-carbon chromium bearing steel rolling element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1205348C (en) * | 2003-03-31 | 2005-06-08 | 孙荣玖 | Wear resistant steel ball production process |
| CN100464940C (en) * | 2007-05-15 | 2009-03-04 | 山东东阿钢球集团有限公司 | Method for producing accurate steel balls |
-
2008
- 2008-10-22 CN CN2008102305259A patent/CN101724742B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328250A (en) * | 2014-11-27 | 2015-02-04 | 王俐帧 | Heat treatment process of bearing steel |
| CN105177377A (en) * | 2015-08-26 | 2015-12-23 | 肖练 | Protective door with interlayer |
| CN106392492A (en) * | 2016-11-23 | 2017-02-15 | 安顺市虹翼特种钢球制造有限公司 | Steel ball production machining method |
| CN106392492B (en) * | 2016-11-23 | 2018-06-15 | 安顺市虹翼特种钢球制造有限公司 | Steel ball production and processing method |
| CN108441620A (en) * | 2018-04-13 | 2018-08-24 | 常熟市龙腾滚动体制造有限公司 | A kind of cooling control method for bearing steel ball |
| CN108441620B (en) * | 2018-04-13 | 2019-11-12 | 常熟市龙腾滚动体制造有限公司 | A kind of cooling control method for bearing steel ball |
| CN112059542A (en) * | 2020-08-19 | 2020-12-11 | 云南昆钢耐磨材料科技股份有限公司 | Production process of high-carbon microalloyed steel ball |
| CN117758039A (en) * | 2023-12-25 | 2024-03-26 | 北京航空航天大学宁波创新研究院 | Heat treatment method for improving crushing load value of high-carbon chromium bearing steel rolling element |
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| CN101724742B (en) | 2012-05-23 |
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Effective date of registration: 20180509 Address after: 471000 No. 1 axis research road, Jianxi science and Technology Industrial Park, Luoyang, Henan Patentee after: LUOYANG BEARING RESEARCH INSTITUTE Co.,Ltd. Address before: 471039 Fenghua Road 6, hi tech Development Zone, Luoyang, Henan. Patentee before: LUOYANG BEARING SCIENCE & TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20120523 Termination date: 20211022 |