CN101328531A - Method for avoiding bearing ring grinding deformation - Google Patents
Method for avoiding bearing ring grinding deformation Download PDFInfo
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- CN101328531A CN101328531A CNA2007100422874A CN200710042287A CN101328531A CN 101328531 A CN101328531 A CN 101328531A CN A2007100422874 A CNA2007100422874 A CN A2007100422874A CN 200710042287 A CN200710042287 A CN 200710042287A CN 101328531 A CN101328531 A CN 101328531A
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- bearing ring
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Abstract
The invention relates to a method for solving the problem that a bearing ferrule is ground and deformed. The method is realized by the following steps that: a bearing ferrule is heated and kept at a temperature of between 820 and 860 DEG C; the heat preservation time is between 0.5 and 1.5 hours; the carbon potential of a protective atmosphere or a controllable atmosphere is between 0.6 and 1.1 percent; and the bearing ferrule is quenched, tempered at a temperature of between 150 and 200 DEG C for 1.5 to 4 hours and kept at the temperature for 3 to 5 hours. The method has the advantages that: t a poor carbon removal layer can not appear on the surface of the bearing ferrule and an even and consistent surface compressive stress can be obtained.
Description
Technical field
The present invention relates to bearing thermal treatment field, relate in particular to a kind of method of bearing ring grinding.
Background technology
Heat treating method to bearing ring in the prior art is realized by following steps: 820～860 ℃ of heat tracings, protective atmosphere or controlled atmosphere but carbon potential lower (＜0.5) quench, subsequently 150～180 ℃ of following tempering 1.5～4 hours.Through after this thermal treatment process, surface stress is tensile stress state, even stress distribution is inhomogeneous.Such bearing is in grinding process, owing to behind the uneven tensile stress stack of the bearing ring grinding force, often take place after the raceway grinding, cylindrical circularity alters a great deal, and causes very high scrap rate 70%～80%.
The carbon potential here is meant that at a certain temperature carbon content arrives balance in the heat-treating atmosphere and steel, and this moment, the carbon content of steel was exactly the carbon potential of atmosphere.Because bearing parts thermal treatment at present generally adopts grill-hearth travelling oven to handle, when utilizing this heat treatment furnace to handle bearing parts, the furnace atmosphere carbon potential generally is controlled at below 0.5%.Because the bearing parts material is the GCr15 steel, its carbon content is 0.95～1.05%, and therefore the carbon-coating of shaking off poverty in various degree can appear in bearing parts after heat treatment, and bearing parts is tensile stress and distributes, even skewness along the circumferential direction.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of method that solves the bearing ring grinding deformation, are intended to solve the above problems.
In order to solve the problems of the technologies described above, the present invention realizes by following steps:
820～860 ℃ of heat tracings; Between the soaking time 0.5～1.5 hour; Soaking time and holding temperature are decided according to concrete bearing wall thickness size.
The carbon potential of protective atmosphere or controlled atmosphere is 0.6～1.1%;
Quench;
150～200 ℃ of following tempering 1.5～4 hours;
Be incubated 3～5 hours.
Compared with prior art, the invention has the beneficial effects as follows: make the bearing ring surface carbon-coating of shaking off poverty not occur, and can obtain the bearing stress of uniformity.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail:
The present invention realizes by following steps:
820～860 ℃ of heat tracings; Between the soaking time 0.5～1.5 hour; Mainly be to decide according to lasso wall thickness size;
The carbon potential 0.6～1.1% of protective atmosphere or controlled atmosphere;
Quench;
150～200 ℃ of following tempering 1.5～4 hours;
Be incubated 3～5 hours.
With deep groove ball bearing 6309 is example, and method is as follows:
Quenching temperature is 840 ± 5 ℃, and soaking time is 45～50 minutes, and the protective atmosphere carbon potential is 0.9,180 ± 10 ℃ of tempering temperatures, soaking time 4 hours.
1, after this thermal treatment process of employing, detect the stress distribution of bearing ring circumferential direction, data are as follows:
| Stress MPa measurement point | 0° | 90° | 180° | 270° |
| 1 | -67 | -60 | -75 | -65 |
| 2 | -30 | -35 | -42 | -29 |
| 3 | -30 | -41 | -38 | -47 |
| 4 | -28 | -37 | -43 | -35 |
| 5 | -54 | -47 | -51 | -46 |
Annotate: " 0 °, 90 °, 180 °, 270 ° " in the form refer to and along the circumferential direction evenly measure 4 points, and " 1,2,3,4,5 " refer to 5 bearing rings of common measurement.
The stress test condition of above test bearing is: X-350A type stressometer, tube voltage are 21kV, and tube current is 6mA, and the collimator tube diameter is φ 2mm.
2, it is as follows to detect data after the grinding:
| Sequence number project | Cylindrical circularity μ m after the external centreless grinding, before the raceway groove grinding | Cylindrical circularity μ m after the raceway groove grinding |
| 1 | 1.55 | 1.61 |
| 2 | 1.62 | 1.71 |
| 3 | 1.54 | 1.69 |
| 4 | 1.49 | 1.57 |
| 5 | 1.58 | 1.64 |
Deep groove ball bearing 6309 design requirements cylindrical circularity are for being not more than 3.0 μ m, and above-mentioned detection data 100% meet design requirement.
The present invention can replace the thermal treatment process of present routine, and the grinding deformation amount of bearing ring grinding deformation amount after than conventional thermal treatment reduced 80%, and scrap rate is reduced to present 5% by original 70%, and production efficiency can remain unchanged.
Claims (2)
1. method that solves the bearing ring grinding deformation, realize by following steps:
820～860 ℃ of heat tracings; Between the soaking time 0.5～1.5 hour; The carbon potential of protective atmosphere or controlled atmosphere is 0.6～1.1%;
Quench;
150～200 ℃ of following tempering 1.5～4 hours;
Be incubated 3～5 hours.
2. the method for solution bearing ring grinding deformation according to claim 1 is at step " 820～860 ℃ of heat tracings; Between the soaking time 0.5～1.5 hour " in: soaking time and holding temperature are decided according to concrete bearing wall thickness size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100422874A CN101328531A (en) | 2007-06-20 | 2007-06-20 | Method for avoiding bearing ring grinding deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100422874A CN101328531A (en) | 2007-06-20 | 2007-06-20 | Method for avoiding bearing ring grinding deformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101328531A true CN101328531A (en) | 2008-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100422874A Pending CN101328531A (en) | 2007-06-20 | 2007-06-20 | Method for avoiding bearing ring grinding deformation |
Country Status (1)
| Country | Link |
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| CN (1) | CN101328531A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942555A (en) * | 2010-08-16 | 2011-01-12 | 浙江八环轴承有限公司 | Heat treatment process of GCr15 steel bearing ring |
| CN101592191B (en) * | 2009-06-29 | 2011-12-07 | 洛阳Lyc轴承有限公司 | Method for processing reinforcing ring of large-sized thin wall complex structure bearing ring |
| CN103014303A (en) * | 2012-12-13 | 2013-04-03 | 内蒙古北方重工业集团有限公司 | Production method of thin and long thin-plate type part |
| 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 |
| CN104099448A (en) * | 2014-07-31 | 2014-10-15 | 江苏力星通用钢球股份有限公司 | Roller heat treatment zero decarbonization control method for mesh belt furnace |
-
2007
- 2007-06-20 CN CNA2007100422874A patent/CN101328531A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592191B (en) * | 2009-06-29 | 2011-12-07 | 洛阳Lyc轴承有限公司 | Method for processing reinforcing ring of large-sized thin wall complex structure bearing ring |
| CN101942555A (en) * | 2010-08-16 | 2011-01-12 | 浙江八环轴承有限公司 | Heat treatment process of GCr15 steel bearing ring |
| CN103014303A (en) * | 2012-12-13 | 2013-04-03 | 内蒙古北方重工业集团有限公司 | Production method of thin and long thin-plate type part |
| 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 |
| CN104099448A (en) * | 2014-07-31 | 2014-10-15 | 江苏力星通用钢球股份有限公司 | Roller heat treatment zero decarbonization control method for mesh belt furnace |
| CN104099448B (en) * | 2014-07-31 | 2016-04-20 | 江苏力星通用钢球股份有限公司 | Meshbeltfurnace roller thermal treatment zero Decarburization Control method |
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Open date: 20081224 |